X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=src%2Fguestfs-actions.c;h=41d873f9b02ed164bda05e0a8ffd2d488c887478;hp=d76010dfc2abf62584b6532357eb54c5765ced83;hb=85ed8cef99c19b4143844991d14e0b848fecc5da;hpb=749708a7ec8930c34605ec58c18fefe0ed8e7981

diff --git a/src/guestfs-actions.c b/src/guestfs-actions.c
index d76010d..41d873f 100644
--- a/src/guestfs-actions.c
+++ b/src/guestfs-actions.c
@@ -86,8 +86,7 @@ check_state (guestfs_h *g, const char *caller)
 struct mount_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -99,6 +98,13 @@ static void mount_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct mount_ctx *ctx = (struct mount_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mount");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -113,7 +119,7 @@ static void mount_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_mount (guestfs_h *g,
@@ -126,6 +132,7 @@ int guestfs_mount (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_mount") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -133,35 +140,42 @@ int guestfs_mount (guestfs_h *g,
   args.mountpoint = (char *) mountpoint;
   serial = guestfs__send_sync (g, GUESTFS_PROC_MOUNT,
         (xdrproc_t) xdr_guestfs_mount_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, mount_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_mount");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MOUNT, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MOUNT, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct sync_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -173,6 +187,13 @@ static void sync_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct sync_ctx *ctx = (struct sync_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_sync");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -187,7 +208,7 @@ static void sync_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_sync (guestfs_h *g)
@@ -197,39 +218,47 @@ int guestfs_sync (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_sync") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_SYNC, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, sync_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_sync");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SYNC, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SYNC, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct touch_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -241,6 +270,13 @@ static void touch_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct touch_ctx *ctx = (struct touch_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_touch");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -255,7 +291,7 @@ static void touch_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_touch (guestfs_h *g,
@@ -267,41 +303,49 @@ int guestfs_touch (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_touch") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_TOUCH,
         (xdrproc_t) xdr_guestfs_touch_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, touch_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_touch");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_TOUCH, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_TOUCH, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct cat_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -314,6 +358,13 @@ static void cat_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct cat_ctx *ctx = (struct cat_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_cat");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -332,7 +383,7 @@ static void cat_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char *guestfs_cat (guestfs_h *g,
@@ -344,41 +395,49 @@ char *guestfs_cat (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_cat") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_CAT,
         (xdrproc_t) xdr_guestfs_cat_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, cat_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_cat");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CAT, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CAT, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.content; /* caller will free */
 }
 
 struct ll_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -391,6 +450,13 @@ static void ll_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct ll_ctx *ctx = (struct ll_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_ll");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -409,7 +475,7 @@ static void ll_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char *guestfs_ll (guestfs_h *g,
@@ -421,41 +487,49 @@ char *guestfs_ll (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_ll") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.directory = (char *) directory;
   serial = guestfs__send_sync (g, GUESTFS_PROC_LL,
         (xdrproc_t) xdr_guestfs_ll_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, ll_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_ll");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LL, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LL, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.listing; /* caller will free */
 }
 
 struct ls_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -468,6 +542,13 @@ static void ls_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct ls_ctx *ctx = (struct ls_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_ls");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -486,7 +567,7 @@ static void ls_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_ls (guestfs_h *g,
@@ -498,33 +579,42 @@ char **guestfs_ls (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_ls") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.directory = (char *) directory;
   serial = guestfs__send_sync (g, GUESTFS_PROC_LS,
         (xdrproc_t) xdr_guestfs_ls_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, ls_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_ls");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LS, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.listing.listing_val =
     safe_realloc (g, ctx.ret.listing.listing_val,
@@ -536,8 +626,7 @@ char **guestfs_ls (guestfs_h *g,
 struct list_devices_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -550,6 +639,13 @@ static void list_devices_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct list_devices_ctx *ctx = (struct list_devices_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_list_devices");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -568,7 +664,7 @@ static void list_devices_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_list_devices (guestfs_h *g)
@@ -578,31 +674,40 @@ char **guestfs_list_devices (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_list_devices") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_LIST_DEVICES, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, list_devices_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_list_devices");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LIST_DEVICES, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LIST_DEVICES, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.devices.devices_val =
     safe_realloc (g, ctx.ret.devices.devices_val,
@@ -614,8 +719,7 @@ char **guestfs_list_devices (guestfs_h *g)
 struct list_partitions_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -628,6 +732,13 @@ static void list_partitions_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct list_partitions_ctx *ctx = (struct list_partitions_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_list_partitions");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -646,7 +757,7 @@ static void list_partitions_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_list_partitions (guestfs_h *g)
@@ -656,31 +767,40 @@ char **guestfs_list_partitions (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_list_partitions") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_LIST_PARTITIONS, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, list_partitions_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_list_partitions");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LIST_PARTITIONS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LIST_PARTITIONS, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.partitions.partitions_val =
     safe_realloc (g, ctx.ret.partitions.partitions_val,
@@ -692,8 +812,7 @@ char **guestfs_list_partitions (guestfs_h *g)
 struct pvs_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -706,6 +825,13 @@ static void pvs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct pvs_ctx *ctx = (struct pvs_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_pvs");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -724,7 +850,7 @@ static void pvs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_pvs (guestfs_h *g)
@@ -734,31 +860,40 @@ char **guestfs_pvs (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_pvs") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_PVS, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, pvs_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_pvs");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PVS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PVS, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.physvols.physvols_val =
     safe_realloc (g, ctx.ret.physvols.physvols_val,
@@ -770,8 +905,7 @@ char **guestfs_pvs (guestfs_h *g)
 struct vgs_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -784,6 +918,13 @@ static void vgs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct vgs_ctx *ctx = (struct vgs_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_vgs");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -802,7 +943,7 @@ static void vgs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_vgs (guestfs_h *g)
@@ -812,31 +953,40 @@ char **guestfs_vgs (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_vgs") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_VGS, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, vgs_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_vgs");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VGS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VGS, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.volgroups.volgroups_val =
     safe_realloc (g, ctx.ret.volgroups.volgroups_val,
@@ -848,8 +998,7 @@ char **guestfs_vgs (guestfs_h *g)
 struct lvs_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -862,6 +1011,13 @@ static void lvs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct lvs_ctx *ctx = (struct lvs_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_lvs");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -880,7 +1036,7 @@ static void lvs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_lvs (guestfs_h *g)
@@ -890,31 +1046,40 @@ char **guestfs_lvs (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_lvs") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_LVS, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, lvs_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_lvs");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVS, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.logvols.logvols_val =
     safe_realloc (g, ctx.ret.logvols.logvols_val,
@@ -926,8 +1091,7 @@ char **guestfs_lvs (guestfs_h *g)
 struct pvs_full_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -940,6 +1104,13 @@ static void pvs_full_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct pvs_full_ctx *ctx = (struct pvs_full_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_pvs_full");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -958,7 +1129,7 @@ static void pvs_full_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 struct guestfs_lvm_pv_list *guestfs_pvs_full (guestfs_h *g)
@@ -968,31 +1139,40 @@ struct guestfs_lvm_pv_list *guestfs_pvs_full (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_pvs_full") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_PVS_FULL, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, pvs_full_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_pvs_full");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PVS_FULL, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PVS_FULL, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this */
   return safe_memdup (g, &ctx.ret.physvols, sizeof (ctx.ret.physvols));
 }
@@ -1000,8 +1180,7 @@ struct guestfs_lvm_pv_list *guestfs_pvs_full (guestfs_h *g)
 struct vgs_full_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1014,6 +1193,13 @@ static void vgs_full_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct vgs_full_ctx *ctx = (struct vgs_full_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_vgs_full");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1032,7 +1218,7 @@ static void vgs_full_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 struct guestfs_lvm_vg_list *guestfs_vgs_full (guestfs_h *g)
@@ -1042,31 +1228,40 @@ struct guestfs_lvm_vg_list *guestfs_vgs_full (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_vgs_full") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_VGS_FULL, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, vgs_full_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_vgs_full");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VGS_FULL, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VGS_FULL, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this */
   return safe_memdup (g, &ctx.ret.volgroups, sizeof (ctx.ret.volgroups));
 }
@@ -1074,8 +1269,7 @@ struct guestfs_lvm_vg_list *guestfs_vgs_full (guestfs_h *g)
 struct lvs_full_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1088,6 +1282,13 @@ static void lvs_full_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct lvs_full_ctx *ctx = (struct lvs_full_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_lvs_full");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1106,7 +1307,7 @@ static void lvs_full_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 struct guestfs_lvm_lv_list *guestfs_lvs_full (guestfs_h *g)
@@ -1116,31 +1317,40 @@ struct guestfs_lvm_lv_list *guestfs_lvs_full (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_lvs_full") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_LVS_FULL, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, lvs_full_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_lvs_full");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVS_FULL, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVS_FULL, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this */
   return safe_memdup (g, &ctx.ret.logvols, sizeof (ctx.ret.logvols));
 }
@@ -1148,8 +1358,7 @@ struct guestfs_lvm_lv_list *guestfs_lvs_full (guestfs_h *g)
 struct read_lines_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1162,6 +1371,13 @@ static void read_lines_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct read_lines_ctx *ctx = (struct read_lines_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_read_lines");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1180,7 +1396,7 @@ static void read_lines_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_read_lines (guestfs_h *g,
@@ -1192,33 +1408,42 @@ char **guestfs_read_lines (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_read_lines") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_READ_LINES,
         (xdrproc_t) xdr_guestfs_read_lines_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, read_lines_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_read_lines");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_READ_LINES, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_READ_LINES, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.lines.lines_val =
     safe_realloc (g, ctx.ret.lines.lines_val,
@@ -1230,8 +1455,7 @@ char **guestfs_read_lines (guestfs_h *g,
 struct aug_init_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1243,6 +1467,13 @@ static void aug_init_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_init_ctx *ctx = (struct aug_init_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_init");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1257,7 +1488,7 @@ static void aug_init_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_init (guestfs_h *g,
@@ -1270,6 +1501,7 @@ int guestfs_aug_init (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_init") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -1277,35 +1509,42 @@ int guestfs_aug_init (guestfs_h *g,
   args.flags = flags;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_INIT,
         (xdrproc_t) xdr_guestfs_aug_init_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_init_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_init");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_INIT, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_INIT, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct aug_close_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1317,6 +1556,13 @@ static void aug_close_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_close_ctx *ctx = (struct aug_close_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_close");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1331,7 +1577,7 @@ static void aug_close_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_close (guestfs_h *g)
@@ -1341,39 +1587,47 @@ int guestfs_aug_close (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_aug_close") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_CLOSE, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_close_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_close");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_CLOSE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_CLOSE, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct aug_defvar_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1386,6 +1640,13 @@ static void aug_defvar_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_defvar_ctx *ctx = (struct aug_defvar_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_defvar");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1404,7 +1665,7 @@ static void aug_defvar_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_defvar (guestfs_h *g,
@@ -1417,6 +1678,7 @@ int guestfs_aug_defvar (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_defvar") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -1424,35 +1686,42 @@ int guestfs_aug_defvar (guestfs_h *g,
   args.expr = expr ? (char **) &expr : NULL;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_DEFVAR,
         (xdrproc_t) xdr_guestfs_aug_defvar_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_defvar_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_defvar");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_DEFVAR, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_DEFVAR, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.nrnodes;
 }
 
 struct aug_defnode_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1465,6 +1734,13 @@ static void aug_defnode_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_defnode_ctx *ctx = (struct aug_defnode_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_defnode");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1483,7 +1759,7 @@ static void aug_defnode_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 struct guestfs_int_bool *guestfs_aug_defnode (guestfs_h *g,
@@ -1497,6 +1773,7 @@ struct guestfs_int_bool *guestfs_aug_defnode (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_defnode") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -1505,27 +1782,35 @@ struct guestfs_int_bool *guestfs_aug_defnode (guestfs_h *g,
   args.val = (char *) val;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_DEFNODE,
         (xdrproc_t) xdr_guestfs_aug_defnode_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_defnode_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_defnode");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_DEFNODE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_DEFNODE, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller with free this */
   return safe_memdup (g, &ctx.ret, sizeof (ctx.ret));
 }
@@ -1533,8 +1818,7 @@ struct guestfs_int_bool *guestfs_aug_defnode (guestfs_h *g,
 struct aug_get_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1547,6 +1831,13 @@ static void aug_get_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_get_ctx *ctx = (struct aug_get_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_get");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1565,7 +1856,7 @@ static void aug_get_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char *guestfs_aug_get (guestfs_h *g,
@@ -1577,41 +1868,49 @@ char *guestfs_aug_get (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_get") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_GET,
         (xdrproc_t) xdr_guestfs_aug_get_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_get_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_get");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_GET, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_GET, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.val; /* caller will free */
 }
 
 struct aug_set_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1623,6 +1922,13 @@ static void aug_set_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_set_ctx *ctx = (struct aug_set_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_set");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1637,7 +1943,7 @@ static void aug_set_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_set (guestfs_h *g,
@@ -1650,6 +1956,7 @@ int guestfs_aug_set (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_set") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -1657,35 +1964,42 @@ int guestfs_aug_set (guestfs_h *g,
   args.val = (char *) val;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_SET,
         (xdrproc_t) xdr_guestfs_aug_set_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_set_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_set");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_SET, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_SET, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct aug_insert_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1697,6 +2011,13 @@ static void aug_insert_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_insert_ctx *ctx = (struct aug_insert_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_insert");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1711,7 +2032,7 @@ static void aug_insert_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_insert (guestfs_h *g,
@@ -1725,6 +2046,7 @@ int guestfs_aug_insert (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_insert") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -1733,35 +2055,42 @@ int guestfs_aug_insert (guestfs_h *g,
   args.before = before;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_INSERT,
         (xdrproc_t) xdr_guestfs_aug_insert_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_insert_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_insert");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_INSERT, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_INSERT, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct aug_rm_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1774,6 +2103,13 @@ static void aug_rm_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_rm_ctx *ctx = (struct aug_rm_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_rm");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1792,7 +2128,7 @@ static void aug_rm_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_rm (guestfs_h *g,
@@ -1804,41 +2140,49 @@ int guestfs_aug_rm (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_rm") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_RM,
         (xdrproc_t) xdr_guestfs_aug_rm_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_rm_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_rm");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_RM, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_RM, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.nrnodes;
 }
 
 struct aug_mv_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1850,6 +2194,13 @@ static void aug_mv_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_mv_ctx *ctx = (struct aug_mv_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_mv");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1864,7 +2215,7 @@ static void aug_mv_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_mv (guestfs_h *g,
@@ -1877,6 +2228,7 @@ int guestfs_aug_mv (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_mv") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -1884,35 +2236,42 @@ int guestfs_aug_mv (guestfs_h *g,
   args.dest = (char *) dest;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_MV,
         (xdrproc_t) xdr_guestfs_aug_mv_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_mv_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_mv");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_MV, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_MV, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct aug_match_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -1925,6 +2284,13 @@ static void aug_match_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_match_ctx *ctx = (struct aug_match_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_match");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -1943,7 +2309,7 @@ static void aug_match_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_aug_match (guestfs_h *g,
@@ -1955,33 +2321,42 @@ char **guestfs_aug_match (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_match") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_MATCH,
         (xdrproc_t) xdr_guestfs_aug_match_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_match_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_match");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_MATCH, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_MATCH, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.matches.matches_val =
     safe_realloc (g, ctx.ret.matches.matches_val,
@@ -1993,8 +2368,7 @@ char **guestfs_aug_match (guestfs_h *g,
 struct aug_save_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2006,6 +2380,13 @@ static void aug_save_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_save_ctx *ctx = (struct aug_save_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_save");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2020,7 +2401,7 @@ static void aug_save_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_save (guestfs_h *g)
@@ -2030,39 +2411,47 @@ int guestfs_aug_save (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_aug_save") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_SAVE, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_save_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_save");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_SAVE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_SAVE, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct aug_load_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2074,6 +2463,13 @@ static void aug_load_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_load_ctx *ctx = (struct aug_load_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_load");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2088,7 +2484,7 @@ static void aug_load_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_aug_load (guestfs_h *g)
@@ -2098,39 +2494,47 @@ int guestfs_aug_load (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_aug_load") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_LOAD, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_load_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_load");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_LOAD, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_LOAD, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct aug_ls_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2143,6 +2547,13 @@ static void aug_ls_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct aug_ls_ctx *ctx = (struct aug_ls_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_aug_ls");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2161,7 +2572,7 @@ static void aug_ls_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_aug_ls (guestfs_h *g,
@@ -2173,33 +2584,42 @@ char **guestfs_aug_ls (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_aug_ls") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_AUG_LS,
         (xdrproc_t) xdr_guestfs_aug_ls_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, aug_ls_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_aug_ls");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_LS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_AUG_LS, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.matches.matches_val =
     safe_realloc (g, ctx.ret.matches.matches_val,
@@ -2211,8 +2631,7 @@ char **guestfs_aug_ls (guestfs_h *g,
 struct rm_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2224,6 +2643,13 @@ static void rm_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct rm_ctx *ctx = (struct rm_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_rm");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2238,7 +2664,7 @@ static void rm_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_rm (guestfs_h *g,
@@ -2250,41 +2676,49 @@ int guestfs_rm (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_rm") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_RM,
         (xdrproc_t) xdr_guestfs_rm_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, rm_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_rm");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_RM, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_RM, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct rmdir_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2296,6 +2730,13 @@ static void rmdir_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct rmdir_ctx *ctx = (struct rmdir_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_rmdir");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2310,7 +2751,7 @@ static void rmdir_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_rmdir (guestfs_h *g,
@@ -2322,41 +2763,49 @@ int guestfs_rmdir (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_rmdir") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_RMDIR,
         (xdrproc_t) xdr_guestfs_rmdir_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, rmdir_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_rmdir");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_RMDIR, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_RMDIR, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct rm_rf_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2368,6 +2817,13 @@ static void rm_rf_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct rm_rf_ctx *ctx = (struct rm_rf_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_rm_rf");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2382,7 +2838,7 @@ static void rm_rf_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_rm_rf (guestfs_h *g,
@@ -2394,41 +2850,49 @@ int guestfs_rm_rf (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_rm_rf") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_RM_RF,
         (xdrproc_t) xdr_guestfs_rm_rf_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, rm_rf_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_rm_rf");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_RM_RF, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_RM_RF, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct mkdir_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2440,6 +2904,13 @@ static void mkdir_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct mkdir_ctx *ctx = (struct mkdir_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mkdir");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2454,7 +2925,7 @@ static void mkdir_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_mkdir (guestfs_h *g,
@@ -2466,41 +2937,49 @@ int guestfs_mkdir (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_mkdir") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_MKDIR,
         (xdrproc_t) xdr_guestfs_mkdir_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, mkdir_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_mkdir");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MKDIR, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MKDIR, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct mkdir_p_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2512,6 +2991,13 @@ static void mkdir_p_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct mkdir_p_ctx *ctx = (struct mkdir_p_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mkdir_p");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2526,7 +3012,7 @@ static void mkdir_p_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_mkdir_p (guestfs_h *g,
@@ -2538,41 +3024,49 @@ int guestfs_mkdir_p (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_mkdir_p") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_MKDIR_P,
         (xdrproc_t) xdr_guestfs_mkdir_p_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, mkdir_p_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_mkdir_p");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MKDIR_P, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MKDIR_P, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct chmod_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2584,6 +3078,13 @@ static void chmod_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct chmod_ctx *ctx = (struct chmod_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_chmod");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2598,7 +3099,7 @@ static void chmod_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_chmod (guestfs_h *g,
@@ -2611,6 +3112,7 @@ int guestfs_chmod (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_chmod") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -2618,35 +3120,42 @@ int guestfs_chmod (guestfs_h *g,
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_CHMOD,
         (xdrproc_t) xdr_guestfs_chmod_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, chmod_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_chmod");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CHMOD, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CHMOD, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct chown_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2658,6 +3167,13 @@ static void chown_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct chown_ctx *ctx = (struct chown_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_chown");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2672,7 +3188,7 @@ static void chown_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_chown (guestfs_h *g,
@@ -2686,6 +3202,7 @@ int guestfs_chown (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_chown") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -2694,35 +3211,42 @@ int guestfs_chown (guestfs_h *g,
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_CHOWN,
         (xdrproc_t) xdr_guestfs_chown_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, chown_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_chown");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CHOWN, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CHOWN, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct exists_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2735,6 +3259,13 @@ static void exists_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct exists_ctx *ctx = (struct exists_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_exists");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2753,7 +3284,7 @@ static void exists_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_exists (guestfs_h *g,
@@ -2765,41 +3296,49 @@ int guestfs_exists (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_exists") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_EXISTS,
         (xdrproc_t) xdr_guestfs_exists_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, exists_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_exists");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_EXISTS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_EXISTS, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.existsflag;
 }
 
 struct is_file_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2812,6 +3351,13 @@ static void is_file_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct is_file_ctx *ctx = (struct is_file_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_is_file");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2830,7 +3376,7 @@ static void is_file_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_is_file (guestfs_h *g,
@@ -2842,41 +3388,49 @@ int guestfs_is_file (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_is_file") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_IS_FILE,
         (xdrproc_t) xdr_guestfs_is_file_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, is_file_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_is_file");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_IS_FILE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_IS_FILE, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.fileflag;
 }
 
 struct is_dir_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2889,6 +3443,13 @@ static void is_dir_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct is_dir_ctx *ctx = (struct is_dir_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_is_dir");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2907,7 +3468,7 @@ static void is_dir_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_is_dir (guestfs_h *g,
@@ -2919,41 +3480,49 @@ int guestfs_is_dir (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_is_dir") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_IS_DIR,
         (xdrproc_t) xdr_guestfs_is_dir_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, is_dir_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_is_dir");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_IS_DIR, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_IS_DIR, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.dirflag;
 }
 
 struct pvcreate_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -2965,6 +3534,13 @@ static void pvcreate_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct pvcreate_ctx *ctx = (struct pvcreate_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_pvcreate");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -2979,7 +3555,7 @@ static void pvcreate_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_pvcreate (guestfs_h *g,
@@ -2991,41 +3567,49 @@ int guestfs_pvcreate (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_pvcreate") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_PVCREATE,
         (xdrproc_t) xdr_guestfs_pvcreate_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, pvcreate_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_pvcreate");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PVCREATE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PVCREATE, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct vgcreate_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3037,6 +3621,13 @@ static void vgcreate_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct vgcreate_ctx *ctx = (struct vgcreate_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_vgcreate");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3051,7 +3642,7 @@ static void vgcreate_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_vgcreate (guestfs_h *g,
@@ -3064,6 +3655,7 @@ int guestfs_vgcreate (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_vgcreate") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -3072,35 +3664,42 @@ int guestfs_vgcreate (guestfs_h *g,
   for (args.physvols.physvols_len = 0; physvols[args.physvols.physvols_len]; args.physvols.physvols_len++) ;
   serial = guestfs__send_sync (g, GUESTFS_PROC_VGCREATE,
         (xdrproc_t) xdr_guestfs_vgcreate_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, vgcreate_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_vgcreate");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VGCREATE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VGCREATE, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct lvcreate_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3112,6 +3711,13 @@ static void lvcreate_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct lvcreate_ctx *ctx = (struct lvcreate_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_lvcreate");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3126,7 +3732,7 @@ static void lvcreate_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_lvcreate (guestfs_h *g,
@@ -3140,6 +3746,7 @@ int guestfs_lvcreate (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_lvcreate") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -3148,35 +3755,42 @@ int guestfs_lvcreate (guestfs_h *g,
   args.mbytes = mbytes;
   serial = guestfs__send_sync (g, GUESTFS_PROC_LVCREATE,
         (xdrproc_t) xdr_guestfs_lvcreate_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, lvcreate_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_lvcreate");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVCREATE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVCREATE, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct mkfs_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3188,6 +3802,13 @@ static void mkfs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct mkfs_ctx *ctx = (struct mkfs_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mkfs");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3202,7 +3823,7 @@ static void mkfs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_mkfs (guestfs_h *g,
@@ -3215,6 +3836,7 @@ int guestfs_mkfs (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_mkfs") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -3222,35 +3844,42 @@ int guestfs_mkfs (guestfs_h *g,
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_MKFS,
         (xdrproc_t) xdr_guestfs_mkfs_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, mkfs_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_mkfs");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MKFS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MKFS, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct sfdisk_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3262,6 +3891,13 @@ static void sfdisk_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct sfdisk_ctx *ctx = (struct sfdisk_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_sfdisk");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3276,7 +3912,7 @@ static void sfdisk_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_sfdisk (guestfs_h *g,
@@ -3292,6 +3928,7 @@ int guestfs_sfdisk (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_sfdisk") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -3303,35 +3940,42 @@ int guestfs_sfdisk (guestfs_h *g,
   for (args.lines.lines_len = 0; lines[args.lines.lines_len]; args.lines.lines_len++) ;
   serial = guestfs__send_sync (g, GUESTFS_PROC_SFDISK,
         (xdrproc_t) xdr_guestfs_sfdisk_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, sfdisk_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_sfdisk");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SFDISK, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SFDISK, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct write_file_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3343,6 +3987,13 @@ static void write_file_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct write_file_ctx *ctx = (struct write_file_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_write_file");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3357,7 +4008,7 @@ static void write_file_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_write_file (guestfs_h *g,
@@ -3371,6 +4022,7 @@ int guestfs_write_file (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_write_file") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -3379,35 +4031,42 @@ int guestfs_write_file (guestfs_h *g,
   args.size = size;
   serial = guestfs__send_sync (g, GUESTFS_PROC_WRITE_FILE,
         (xdrproc_t) xdr_guestfs_write_file_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, write_file_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_write_file");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_WRITE_FILE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_WRITE_FILE, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct umount_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3419,6 +4078,13 @@ static void umount_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct umount_ctx *ctx = (struct umount_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_umount");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3433,7 +4099,7 @@ static void umount_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_umount (guestfs_h *g,
@@ -3445,41 +4111,49 @@ int guestfs_umount (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_umount") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.pathordevice = (char *) pathordevice;
   serial = guestfs__send_sync (g, GUESTFS_PROC_UMOUNT,
         (xdrproc_t) xdr_guestfs_umount_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, umount_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_umount");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_UMOUNT, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_UMOUNT, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct mounts_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3492,6 +4166,13 @@ static void mounts_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct mounts_ctx *ctx = (struct mounts_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mounts");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3510,7 +4191,7 @@ static void mounts_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_mounts (guestfs_h *g)
@@ -3520,31 +4201,40 @@ char **guestfs_mounts (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_mounts") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_MOUNTS, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, mounts_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_mounts");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MOUNTS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MOUNTS, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.devices.devices_val =
     safe_realloc (g, ctx.ret.devices.devices_val,
@@ -3556,8 +4246,7 @@ char **guestfs_mounts (guestfs_h *g)
 struct umount_all_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3569,6 +4258,13 @@ static void umount_all_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct umount_all_ctx *ctx = (struct umount_all_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_umount_all");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3583,7 +4279,7 @@ static void umount_all_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_umount_all (guestfs_h *g)
@@ -3593,39 +4289,47 @@ int guestfs_umount_all (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_umount_all") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_UMOUNT_ALL, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, umount_all_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_umount_all");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_UMOUNT_ALL, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_UMOUNT_ALL, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct lvm_remove_all_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3637,6 +4341,13 @@ static void lvm_remove_all_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct lvm_remove_all_ctx *ctx = (struct lvm_remove_all_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_lvm_remove_all");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3651,7 +4362,7 @@ static void lvm_remove_all_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_lvm_remove_all (guestfs_h *g)
@@ -3661,39 +4372,47 @@ int guestfs_lvm_remove_all (guestfs_h *g)
   int serial;
 
   if (check_state (g, "guestfs_lvm_remove_all") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   serial = guestfs__send_sync (g, GUESTFS_PROC_LVM_REMOVE_ALL, NULL, NULL);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, lvm_remove_all_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_lvm_remove_all");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVM_REMOVE_ALL, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVM_REMOVE_ALL, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct file_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3706,6 +4425,13 @@ static void file_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct file_ctx *ctx = (struct file_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_file");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3724,7 +4450,7 @@ static void file_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char *guestfs_file (guestfs_h *g,
@@ -3736,41 +4462,49 @@ char *guestfs_file (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_file") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_FILE,
         (xdrproc_t) xdr_guestfs_file_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, file_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_file");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_FILE, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_FILE, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.description; /* caller will free */
 }
 
 struct command_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3783,6 +4517,13 @@ static void command_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct command_ctx *ctx = (struct command_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_command");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3801,7 +4542,7 @@ static void command_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char *guestfs_command (guestfs_h *g,
@@ -3813,6 +4554,7 @@ char *guestfs_command (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_command") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -3820,35 +4562,42 @@ char *guestfs_command (guestfs_h *g,
   for (args.arguments.arguments_len = 0; arguments[args.arguments.arguments_len]; args.arguments.arguments_len++) ;
   serial = guestfs__send_sync (g, GUESTFS_PROC_COMMAND,
         (xdrproc_t) xdr_guestfs_command_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, command_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_command");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_COMMAND, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_COMMAND, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.output; /* caller will free */
 }
 
 struct command_lines_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3861,6 +4610,13 @@ static void command_lines_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct command_lines_ctx *ctx = (struct command_lines_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_command_lines");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -3879,7 +4635,7 @@ static void command_lines_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_command_lines (guestfs_h *g,
@@ -3891,6 +4647,7 @@ char **guestfs_command_lines (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_command_lines") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -3898,27 +4655,35 @@ char **guestfs_command_lines (guestfs_h *g,
   for (args.arguments.arguments_len = 0; arguments[args.arguments.arguments_len]; args.arguments.arguments_len++) ;
   serial = guestfs__send_sync (g, GUESTFS_PROC_COMMAND_LINES,
         (xdrproc_t) xdr_guestfs_command_lines_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, command_lines_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_command_lines");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_COMMAND_LINES, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_COMMAND_LINES, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.lines.lines_val =
     safe_realloc (g, ctx.ret.lines.lines_val,
@@ -3930,8 +4695,7 @@ char **guestfs_command_lines (guestfs_h *g,
 struct stat_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -3944,7 +4708,14 @@ static void stat_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct stat_ctx *ctx = (struct stat_ctx *) data;
 
-  ml->main_loop_quit (ml, g);
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_stat");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
     error (g, "%s: failed to parse reply header", "guestfs_stat");
@@ -3962,7 +4733,7 @@ static void stat_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 struct guestfs_stat *guestfs_stat (guestfs_h *g,
@@ -3974,33 +4745,42 @@ struct guestfs_stat *guestfs_stat (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_stat") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_STAT,
         (xdrproc_t) xdr_guestfs_stat_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, stat_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_stat");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_STAT, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_STAT, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this */
   return safe_memdup (g, &ctx.ret.statbuf, sizeof (ctx.ret.statbuf));
 }
@@ -4008,8 +4788,7 @@ struct guestfs_stat *guestfs_stat (guestfs_h *g,
 struct lstat_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4022,6 +4801,13 @@ static void lstat_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct lstat_ctx *ctx = (struct lstat_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_lstat");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4040,7 +4826,7 @@ static void lstat_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 struct guestfs_stat *guestfs_lstat (guestfs_h *g,
@@ -4052,33 +4838,42 @@ struct guestfs_stat *guestfs_lstat (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_lstat") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_LSTAT,
         (xdrproc_t) xdr_guestfs_lstat_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, lstat_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_lstat");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LSTAT, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LSTAT, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this */
   return safe_memdup (g, &ctx.ret.statbuf, sizeof (ctx.ret.statbuf));
 }
@@ -4086,8 +4881,7 @@ struct guestfs_stat *guestfs_lstat (guestfs_h *g,
 struct statvfs_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4100,6 +4894,13 @@ static void statvfs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct statvfs_ctx *ctx = (struct statvfs_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_statvfs");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4118,7 +4919,7 @@ static void statvfs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 struct guestfs_statvfs *guestfs_statvfs (guestfs_h *g,
@@ -4130,33 +4931,42 @@ struct guestfs_statvfs *guestfs_statvfs (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_statvfs") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.path = (char *) path;
   serial = guestfs__send_sync (g, GUESTFS_PROC_STATVFS,
         (xdrproc_t) xdr_guestfs_statvfs_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, statvfs_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_statvfs");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_STATVFS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_STATVFS, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this */
   return safe_memdup (g, &ctx.ret.statbuf, sizeof (ctx.ret.statbuf));
 }
@@ -4164,8 +4974,7 @@ struct guestfs_statvfs *guestfs_statvfs (guestfs_h *g,
 struct tune2fs_l_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4178,6 +4987,13 @@ static void tune2fs_l_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct tune2fs_l_ctx *ctx = (struct tune2fs_l_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_tune2fs_l");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4196,7 +5012,7 @@ static void tune2fs_l_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 char **guestfs_tune2fs_l (guestfs_h *g,
@@ -4208,33 +5024,42 @@ char **guestfs_tune2fs_l (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_tune2fs_l") == -1) return NULL;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_TUNE2FS_L,
         (xdrproc_t) xdr_guestfs_tune2fs_l_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, tune2fs_l_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_tune2fs_l");
+    guestfs_end_busy (g);
     return NULL;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_TUNE2FS_L, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_TUNE2FS_L, serial) == -1) {
+    guestfs_end_busy (g);
     return NULL;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return NULL;
   }
 
+  guestfs_end_busy (g);
   /* caller will free this, but we need to add a NULL entry */
   ctx.ret.superblock.superblock_val =
     safe_realloc (g, ctx.ret.superblock.superblock_val,
@@ -4246,8 +5071,7 @@ char **guestfs_tune2fs_l (guestfs_h *g,
 struct blockdev_setro_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4259,6 +5083,13 @@ static void blockdev_setro_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_setro_ctx *ctx = (struct blockdev_setro_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_setro");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4273,7 +5104,7 @@ static void blockdev_setro_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_blockdev_setro (guestfs_h *g,
@@ -4285,41 +5116,49 @@ int guestfs_blockdev_setro (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_setro") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_SETRO,
         (xdrproc_t) xdr_guestfs_blockdev_setro_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_setro_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_setro");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_SETRO, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_SETRO, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct blockdev_setrw_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4331,6 +5170,13 @@ static void blockdev_setrw_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_setrw_ctx *ctx = (struct blockdev_setrw_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_setrw");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4345,7 +5191,7 @@ static void blockdev_setrw_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_blockdev_setrw (guestfs_h *g,
@@ -4357,41 +5203,49 @@ int guestfs_blockdev_setrw (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_setrw") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_SETRW,
         (xdrproc_t) xdr_guestfs_blockdev_setrw_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_setrw_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_setrw");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_SETRW, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_SETRW, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct blockdev_getro_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4404,6 +5258,13 @@ static void blockdev_getro_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_getro_ctx *ctx = (struct blockdev_getro_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_getro");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4422,7 +5283,7 @@ static void blockdev_getro_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_blockdev_getro (guestfs_h *g,
@@ -4434,41 +5295,49 @@ int guestfs_blockdev_getro (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_getro") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_GETRO,
         (xdrproc_t) xdr_guestfs_blockdev_getro_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_getro_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_getro");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETRO, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETRO, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.ro;
 }
 
 struct blockdev_getss_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4481,6 +5350,13 @@ static void blockdev_getss_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_getss_ctx *ctx = (struct blockdev_getss_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_getss");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4499,7 +5375,7 @@ static void blockdev_getss_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_blockdev_getss (guestfs_h *g,
@@ -4511,41 +5387,49 @@ int guestfs_blockdev_getss (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_getss") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_GETSS,
         (xdrproc_t) xdr_guestfs_blockdev_getss_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_getss_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_getss");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETSS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETSS, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.sectorsize;
 }
 
 struct blockdev_getbsz_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4558,6 +5442,13 @@ static void blockdev_getbsz_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_getbsz_ctx *ctx = (struct blockdev_getbsz_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_getbsz");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4576,7 +5467,7 @@ static void blockdev_getbsz_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_blockdev_getbsz (guestfs_h *g,
@@ -4588,41 +5479,49 @@ int guestfs_blockdev_getbsz (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_getbsz") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_GETBSZ,
         (xdrproc_t) xdr_guestfs_blockdev_getbsz_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_getbsz_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_getbsz");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETBSZ, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETBSZ, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.blocksize;
 }
 
 struct blockdev_setbsz_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4634,6 +5533,13 @@ static void blockdev_setbsz_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_setbsz_ctx *ctx = (struct blockdev_setbsz_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_setbsz");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4648,7 +5554,7 @@ static void blockdev_setbsz_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_blockdev_setbsz (guestfs_h *g,
@@ -4661,6 +5567,7 @@ int guestfs_blockdev_setbsz (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_setbsz") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
@@ -4668,35 +5575,42 @@ int guestfs_blockdev_setbsz (guestfs_h *g,
   args.blocksize = blocksize;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_SETBSZ,
         (xdrproc_t) xdr_guestfs_blockdev_setbsz_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_setbsz_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_setbsz");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_SETBSZ, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_SETBSZ, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct blockdev_getsz_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4709,6 +5623,13 @@ static void blockdev_getsz_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_getsz_ctx *ctx = (struct blockdev_getsz_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_getsz");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4727,7 +5648,7 @@ static void blockdev_getsz_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int64_t guestfs_blockdev_getsz (guestfs_h *g,
@@ -4739,41 +5660,49 @@ int64_t guestfs_blockdev_getsz (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_getsz") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_GETSZ,
         (xdrproc_t) xdr_guestfs_blockdev_getsz_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_getsz_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_getsz");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETSZ, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETSZ, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.sizeinsectors;
 }
 
 struct blockdev_getsize64_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4786,6 +5715,13 @@ static void blockdev_getsize64_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_getsize64_ctx *ctx = (struct blockdev_getsize64_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_getsize64");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4804,7 +5740,7 @@ static void blockdev_getsize64_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     return;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int64_t guestfs_blockdev_getsize64 (guestfs_h *g,
@@ -4816,41 +5752,49 @@ int64_t guestfs_blockdev_getsize64 (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_getsize64") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_GETSIZE64,
         (xdrproc_t) xdr_guestfs_blockdev_getsize64_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_getsize64_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_getsize64");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETSIZE64, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_GETSIZE64, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return ctx.ret.sizeinbytes;
 }
 
 struct blockdev_flushbufs_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4862,6 +5806,13 @@ static void blockdev_flushbufs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_flushbufs_ctx *ctx = (struct blockdev_flushbufs_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_flushbufs");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4876,7 +5827,7 @@ static void blockdev_flushbufs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_blockdev_flushbufs (guestfs_h *g,
@@ -4888,41 +5839,49 @@ int guestfs_blockdev_flushbufs (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_flushbufs") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_FLUSHBUFS,
         (xdrproc_t) xdr_guestfs_blockdev_flushbufs_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_flushbufs_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_flushbufs");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_FLUSHBUFS, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_FLUSHBUFS, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct blockdev_rereadpt_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -4934,6 +5893,13 @@ static void blockdev_rereadpt_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct blockdev_rereadpt_ctx *ctx = (struct blockdev_rereadpt_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_blockdev_rereadpt");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -4948,7 +5914,7 @@ static void blockdev_rereadpt_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_blockdev_rereadpt (guestfs_h *g,
@@ -4960,41 +5926,49 @@ int guestfs_blockdev_rereadpt (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_blockdev_rereadpt") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.device = (char *) device;
   serial = guestfs__send_sync (g, GUESTFS_PROC_BLOCKDEV_REREADPT,
         (xdrproc_t) xdr_guestfs_blockdev_rereadpt_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, blockdev_rereadpt_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_blockdev_rereadpt");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_REREADPT, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_BLOCKDEV_REREADPT, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct upload_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -5006,6 +5980,13 @@ static void upload_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct upload_ctx *ctx = (struct upload_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_upload");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -5020,7 +6001,7 @@ static void upload_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_upload (guestfs_h *g,
@@ -5033,44 +6014,62 @@ int guestfs_upload (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_upload") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.remotefilename = (char *) remotefilename;
   serial = guestfs__send_sync (g, GUESTFS_PROC_UPLOAD,
         (xdrproc_t) xdr_guestfs_upload_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
-  if (guestfs__send_file_sync (g, filename) == -1)
-    return -1;
+  {
+    int r;
 
+    r = guestfs__send_file_sync (g, filename);
+    if (r == -1) {
+      guestfs_end_busy (g);
+      return -1;
+    }
+    if (r == -2) /* daemon cancelled */
+      goto read_reply;
+  }
+
+ read_reply:
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, upload_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_upload");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_UPLOAD, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_UPLOAD, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
     return -1;
   }
 
+  guestfs_end_busy (g);
   return 0;
 }
 
 struct download_ctx {
   /* This flag is set by the callbacks, so we know we've done
    * the callbacks as expected, and in the right sequence.
-   * 0 = not called, 1 = send called,
-   * 1001 = reply called.
+   * 0 = not called, 1 = reply_cb called.
    */
   int cb_sequence;
   struct guestfs_message_header hdr;
@@ -5082,6 +6081,13 @@ static void download_reply_cb (guestfs_h *g, void *data, XDR *xdr)
   guestfs_main_loop *ml = guestfs_get_main_loop (g);
   struct download_ctx *ctx = (struct download_ctx *) data;
 
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_download");
+    return;
+  }
+
   ml->main_loop_quit (ml, g);
 
   if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
@@ -5096,7 +6102,7 @@ static void download_reply_cb (guestfs_h *g, void *data, XDR *xdr)
     goto done;
   }
  done:
-  ctx->cb_sequence = 1001;
+  ctx->cb_sequence = 1;
 }
 
 int guestfs_download (guestfs_h *g,
@@ -5109,36 +6115,3421 @@ int guestfs_download (guestfs_h *g,
   int serial;
 
   if (check_state (g, "guestfs_download") == -1) return -1;
+  guestfs_set_busy (g);
 
   memset (&ctx, 0, sizeof ctx);
 
   args.remotefilename = (char *) remotefilename;
   serial = guestfs__send_sync (g, GUESTFS_PROC_DOWNLOAD,
         (xdrproc_t) xdr_guestfs_download_args, (char *) &args);
-  if (serial == -1)
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   guestfs__switch_to_receiving (g);
   ctx.cb_sequence = 0;
   guestfs_set_reply_callback (g, download_reply_cb, &ctx);
   (void) ml->main_loop_run (ml, g);
   guestfs_set_reply_callback (g, NULL, NULL);
-  if (ctx.cb_sequence != 1001) {
+  if (ctx.cb_sequence != 1) {
     error (g, "%s reply failed, see earlier error messages", "guestfs_download");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_DOWNLOAD, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (guestfs__receive_file_sync (g, filename) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct checksum_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_checksum_ret ret;
+};
+
+static void checksum_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct checksum_ctx *ctx = (struct checksum_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_checksum");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_checksum");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_checksum");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_checksum_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_checksum");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_checksum (guestfs_h *g,
+		const char *csumtype,
+		const char *path)
+{
+  struct guestfs_checksum_args args;
+  struct checksum_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_checksum") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.csumtype = (char *) csumtype;
+  args.path = (char *) path;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_CHECKSUM,
+        (xdrproc_t) xdr_guestfs_checksum_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, checksum_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_checksum");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CHECKSUM, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.checksum; /* caller will free */
+}
+
+struct tar_in_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void tar_in_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct tar_in_ctx *ctx = (struct tar_in_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_tar_in");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_tar_in");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_tar_in");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_tar_in (guestfs_h *g,
+		const char *tarfile,
+		const char *directory)
+{
+  struct guestfs_tar_in_args args;
+  struct tar_in_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_tar_in") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.directory = (char *) directory;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_TAR_IN,
+        (xdrproc_t) xdr_guestfs_tar_in_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  {
+    int r;
+
+    r = guestfs__send_file_sync (g, tarfile);
+    if (r == -1) {
+      guestfs_end_busy (g);
+      return -1;
+    }
+    if (r == -2) /* daemon cancelled */
+      goto read_reply;
+  }
+
+ read_reply:
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, tar_in_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_tar_in");
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_DOWNLOAD, serial) == -1)
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_TAR_IN, serial) == -1) {
+    guestfs_end_busy (g);
     return -1;
+  }
 
   if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
     error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct tar_out_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void tar_out_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct tar_out_ctx *ctx = (struct tar_out_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_tar_out");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_tar_out");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_tar_out");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_tar_out (guestfs_h *g,
+		const char *directory,
+		const char *tarfile)
+{
+  struct guestfs_tar_out_args args;
+  struct tar_out_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_tar_out") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.directory = (char *) directory;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_TAR_OUT,
+        (xdrproc_t) xdr_guestfs_tar_out_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
     return -1;
   }
 
-  if (guestfs__receive_file_sync (g, filename) == -1)
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, tar_out_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_tar_out");
+    guestfs_end_busy (g);
     return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_TAR_OUT, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (guestfs__receive_file_sync (g, tarfile) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct tgz_in_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void tgz_in_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct tgz_in_ctx *ctx = (struct tgz_in_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_tgz_in");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_tgz_in");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_tgz_in");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_tgz_in (guestfs_h *g,
+		const char *tarball,
+		const char *directory)
+{
+  struct guestfs_tgz_in_args args;
+  struct tgz_in_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_tgz_in") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.directory = (char *) directory;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_TGZ_IN,
+        (xdrproc_t) xdr_guestfs_tgz_in_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  {
+    int r;
+
+    r = guestfs__send_file_sync (g, tarball);
+    if (r == -1) {
+      guestfs_end_busy (g);
+      return -1;
+    }
+    if (r == -2) /* daemon cancelled */
+      goto read_reply;
+  }
+
+ read_reply:
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, tgz_in_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_tgz_in");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_TGZ_IN, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct tgz_out_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void tgz_out_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct tgz_out_ctx *ctx = (struct tgz_out_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_tgz_out");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_tgz_out");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_tgz_out");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_tgz_out (guestfs_h *g,
+		const char *directory,
+		const char *tarball)
+{
+  struct guestfs_tgz_out_args args;
+  struct tgz_out_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_tgz_out") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.directory = (char *) directory;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_TGZ_OUT,
+        (xdrproc_t) xdr_guestfs_tgz_out_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, tgz_out_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_tgz_out");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_TGZ_OUT, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (guestfs__receive_file_sync (g, tarball) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct mount_ro_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void mount_ro_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct mount_ro_ctx *ctx = (struct mount_ro_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mount_ro");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_mount_ro");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_mount_ro");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_mount_ro (guestfs_h *g,
+		const char *device,
+		const char *mountpoint)
+{
+  struct guestfs_mount_ro_args args;
+  struct mount_ro_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_mount_ro") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  args.mountpoint = (char *) mountpoint;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_MOUNT_RO,
+        (xdrproc_t) xdr_guestfs_mount_ro_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, mount_ro_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_mount_ro");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MOUNT_RO, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct mount_options_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void mount_options_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct mount_options_ctx *ctx = (struct mount_options_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mount_options");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_mount_options");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_mount_options");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_mount_options (guestfs_h *g,
+		const char *options,
+		const char *device,
+		const char *mountpoint)
+{
+  struct guestfs_mount_options_args args;
+  struct mount_options_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_mount_options") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.options = (char *) options;
+  args.device = (char *) device;
+  args.mountpoint = (char *) mountpoint;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_MOUNT_OPTIONS,
+        (xdrproc_t) xdr_guestfs_mount_options_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, mount_options_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_mount_options");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MOUNT_OPTIONS, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct mount_vfs_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void mount_vfs_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct mount_vfs_ctx *ctx = (struct mount_vfs_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mount_vfs");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_mount_vfs");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_mount_vfs");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_mount_vfs (guestfs_h *g,
+		const char *options,
+		const char *vfstype,
+		const char *device,
+		const char *mountpoint)
+{
+  struct guestfs_mount_vfs_args args;
+  struct mount_vfs_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_mount_vfs") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.options = (char *) options;
+  args.vfstype = (char *) vfstype;
+  args.device = (char *) device;
+  args.mountpoint = (char *) mountpoint;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_MOUNT_VFS,
+        (xdrproc_t) xdr_guestfs_mount_vfs_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, mount_vfs_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_mount_vfs");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MOUNT_VFS, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct debug_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_debug_ret ret;
+};
+
+static void debug_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct debug_ctx *ctx = (struct debug_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_debug");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_debug");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_debug");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_debug_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_debug");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_debug (guestfs_h *g,
+		const char *subcmd,
+		char * const* const extraargs)
+{
+  struct guestfs_debug_args args;
+  struct debug_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_debug") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.subcmd = (char *) subcmd;
+  args.extraargs.extraargs_val = (char **) extraargs;
+  for (args.extraargs.extraargs_len = 0; extraargs[args.extraargs.extraargs_len]; args.extraargs.extraargs_len++) ;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_DEBUG,
+        (xdrproc_t) xdr_guestfs_debug_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, debug_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_debug");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_DEBUG, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.result; /* caller will free */
+}
+
+struct lvremove_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void lvremove_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct lvremove_ctx *ctx = (struct lvremove_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_lvremove");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_lvremove");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_lvremove");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_lvremove (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_lvremove_args args;
+  struct lvremove_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_lvremove") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_LVREMOVE,
+        (xdrproc_t) xdr_guestfs_lvremove_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, lvremove_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_lvremove");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_LVREMOVE, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct vgremove_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void vgremove_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct vgremove_ctx *ctx = (struct vgremove_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_vgremove");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_vgremove");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_vgremove");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_vgremove (guestfs_h *g,
+		const char *vgname)
+{
+  struct guestfs_vgremove_args args;
+  struct vgremove_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_vgremove") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.vgname = (char *) vgname;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_VGREMOVE,
+        (xdrproc_t) xdr_guestfs_vgremove_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, vgremove_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_vgremove");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VGREMOVE, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct pvremove_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void pvremove_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct pvremove_ctx *ctx = (struct pvremove_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_pvremove");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_pvremove");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_pvremove");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_pvremove (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_pvremove_args args;
+  struct pvremove_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_pvremove") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_PVREMOVE,
+        (xdrproc_t) xdr_guestfs_pvremove_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, pvremove_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_pvremove");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PVREMOVE, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct set_e2label_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void set_e2label_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct set_e2label_ctx *ctx = (struct set_e2label_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_set_e2label");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_set_e2label");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_set_e2label");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_set_e2label (guestfs_h *g,
+		const char *device,
+		const char *label)
+{
+  struct guestfs_set_e2label_args args;
+  struct set_e2label_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_set_e2label") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  args.label = (char *) label;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_SET_E2LABEL,
+        (xdrproc_t) xdr_guestfs_set_e2label_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, set_e2label_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_set_e2label");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SET_E2LABEL, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct get_e2label_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_get_e2label_ret ret;
+};
+
+static void get_e2label_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct get_e2label_ctx *ctx = (struct get_e2label_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_get_e2label");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_get_e2label");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_get_e2label");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_get_e2label_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_get_e2label");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_get_e2label (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_get_e2label_args args;
+  struct get_e2label_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_get_e2label") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_GET_E2LABEL,
+        (xdrproc_t) xdr_guestfs_get_e2label_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, get_e2label_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_get_e2label");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_GET_E2LABEL, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.label; /* caller will free */
+}
+
+struct set_e2uuid_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void set_e2uuid_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct set_e2uuid_ctx *ctx = (struct set_e2uuid_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_set_e2uuid");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_set_e2uuid");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_set_e2uuid");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_set_e2uuid (guestfs_h *g,
+		const char *device,
+		const char *uuid)
+{
+  struct guestfs_set_e2uuid_args args;
+  struct set_e2uuid_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_set_e2uuid") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  args.uuid = (char *) uuid;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_SET_E2UUID,
+        (xdrproc_t) xdr_guestfs_set_e2uuid_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, set_e2uuid_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_set_e2uuid");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SET_E2UUID, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct get_e2uuid_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_get_e2uuid_ret ret;
+};
+
+static void get_e2uuid_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct get_e2uuid_ctx *ctx = (struct get_e2uuid_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_get_e2uuid");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_get_e2uuid");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_get_e2uuid");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_get_e2uuid_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_get_e2uuid");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_get_e2uuid (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_get_e2uuid_args args;
+  struct get_e2uuid_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_get_e2uuid") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_GET_E2UUID,
+        (xdrproc_t) xdr_guestfs_get_e2uuid_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, get_e2uuid_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_get_e2uuid");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_GET_E2UUID, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.uuid; /* caller will free */
+}
+
+struct fsck_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_fsck_ret ret;
+};
+
+static void fsck_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct fsck_ctx *ctx = (struct fsck_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_fsck");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_fsck");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_fsck");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_fsck_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_fsck");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_fsck (guestfs_h *g,
+		const char *fstype,
+		const char *device)
+{
+  struct guestfs_fsck_args args;
+  struct fsck_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_fsck") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.fstype = (char *) fstype;
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_FSCK,
+        (xdrproc_t) xdr_guestfs_fsck_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, fsck_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_fsck");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_FSCK, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.status;
+}
+
+struct zero_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void zero_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct zero_ctx *ctx = (struct zero_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_zero");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_zero");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_zero");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_zero (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_zero_args args;
+  struct zero_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_zero") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_ZERO,
+        (xdrproc_t) xdr_guestfs_zero_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, zero_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_zero");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_ZERO, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct grub_install_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void grub_install_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct grub_install_ctx *ctx = (struct grub_install_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_grub_install");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_grub_install");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_grub_install");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_grub_install (guestfs_h *g,
+		const char *root,
+		const char *device)
+{
+  struct guestfs_grub_install_args args;
+  struct grub_install_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_grub_install") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.root = (char *) root;
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_GRUB_INSTALL,
+        (xdrproc_t) xdr_guestfs_grub_install_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, grub_install_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_grub_install");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_GRUB_INSTALL, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct cp_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void cp_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct cp_ctx *ctx = (struct cp_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_cp");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_cp");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_cp");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_cp (guestfs_h *g,
+		const char *src,
+		const char *dest)
+{
+  struct guestfs_cp_args args;
+  struct cp_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_cp") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.src = (char *) src;
+  args.dest = (char *) dest;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_CP,
+        (xdrproc_t) xdr_guestfs_cp_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, cp_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_cp");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CP, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct cp_a_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void cp_a_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct cp_a_ctx *ctx = (struct cp_a_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_cp_a");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_cp_a");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_cp_a");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_cp_a (guestfs_h *g,
+		const char *src,
+		const char *dest)
+{
+  struct guestfs_cp_a_args args;
+  struct cp_a_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_cp_a") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.src = (char *) src;
+  args.dest = (char *) dest;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_CP_A,
+        (xdrproc_t) xdr_guestfs_cp_a_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, cp_a_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_cp_a");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_CP_A, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct mv_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void mv_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct mv_ctx *ctx = (struct mv_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_mv");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_mv");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_mv");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_mv (guestfs_h *g,
+		const char *src,
+		const char *dest)
+{
+  struct guestfs_mv_args args;
+  struct mv_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_mv") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.src = (char *) src;
+  args.dest = (char *) dest;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_MV,
+        (xdrproc_t) xdr_guestfs_mv_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, mv_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_mv");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_MV, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct drop_caches_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void drop_caches_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct drop_caches_ctx *ctx = (struct drop_caches_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_drop_caches");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_drop_caches");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_drop_caches");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_drop_caches (guestfs_h *g,
+		int whattodrop)
+{
+  struct guestfs_drop_caches_args args;
+  struct drop_caches_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_drop_caches") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.whattodrop = whattodrop;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_DROP_CACHES,
+        (xdrproc_t) xdr_guestfs_drop_caches_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, drop_caches_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_drop_caches");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_DROP_CACHES, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct dmesg_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_dmesg_ret ret;
+};
+
+static void dmesg_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct dmesg_ctx *ctx = (struct dmesg_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_dmesg");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_dmesg");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_dmesg");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_dmesg_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_dmesg");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_dmesg (guestfs_h *g)
+{
+  struct dmesg_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_dmesg") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  serial = guestfs__send_sync (g, GUESTFS_PROC_DMESG, NULL, NULL);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, dmesg_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_dmesg");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_DMESG, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.kmsgs; /* caller will free */
+}
+
+struct ping_daemon_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void ping_daemon_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct ping_daemon_ctx *ctx = (struct ping_daemon_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_ping_daemon");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_ping_daemon");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_ping_daemon");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_ping_daemon (guestfs_h *g)
+{
+  struct ping_daemon_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_ping_daemon") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  serial = guestfs__send_sync (g, GUESTFS_PROC_PING_DAEMON, NULL, NULL);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, ping_daemon_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_ping_daemon");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PING_DAEMON, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct equal_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_equal_ret ret;
+};
+
+static void equal_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct equal_ctx *ctx = (struct equal_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_equal");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_equal");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_equal");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_equal_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_equal");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_equal (guestfs_h *g,
+		const char *file1,
+		const char *file2)
+{
+  struct guestfs_equal_args args;
+  struct equal_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_equal") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.file1 = (char *) file1;
+  args.file2 = (char *) file2;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_EQUAL,
+        (xdrproc_t) xdr_guestfs_equal_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, equal_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_equal");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_EQUAL, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.equality;
+}
+
+struct strings_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_strings_ret ret;
+};
+
+static void strings_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct strings_ctx *ctx = (struct strings_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_strings");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_strings");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_strings");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_strings_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_strings");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char **guestfs_strings (guestfs_h *g,
+		const char *path)
+{
+  struct guestfs_strings_args args;
+  struct strings_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_strings") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.path = (char *) path;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_STRINGS,
+        (xdrproc_t) xdr_guestfs_strings_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, strings_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_strings");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_STRINGS, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  /* caller will free this, but we need to add a NULL entry */
+  ctx.ret.stringsout.stringsout_val =
+    safe_realloc (g, ctx.ret.stringsout.stringsout_val,
+                  sizeof (char *) * (ctx.ret.stringsout.stringsout_len + 1));
+  ctx.ret.stringsout.stringsout_val[ctx.ret.stringsout.stringsout_len] = NULL;
+  return ctx.ret.stringsout.stringsout_val;
+}
+
+struct strings_e_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_strings_e_ret ret;
+};
+
+static void strings_e_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct strings_e_ctx *ctx = (struct strings_e_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_strings_e");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_strings_e");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_strings_e");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_strings_e_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_strings_e");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char **guestfs_strings_e (guestfs_h *g,
+		const char *encoding,
+		const char *path)
+{
+  struct guestfs_strings_e_args args;
+  struct strings_e_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_strings_e") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.encoding = (char *) encoding;
+  args.path = (char *) path;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_STRINGS_E,
+        (xdrproc_t) xdr_guestfs_strings_e_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, strings_e_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_strings_e");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_STRINGS_E, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  /* caller will free this, but we need to add a NULL entry */
+  ctx.ret.stringsout.stringsout_val =
+    safe_realloc (g, ctx.ret.stringsout.stringsout_val,
+                  sizeof (char *) * (ctx.ret.stringsout.stringsout_len + 1));
+  ctx.ret.stringsout.stringsout_val[ctx.ret.stringsout.stringsout_len] = NULL;
+  return ctx.ret.stringsout.stringsout_val;
+}
+
+struct hexdump_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_hexdump_ret ret;
+};
+
+static void hexdump_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct hexdump_ctx *ctx = (struct hexdump_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_hexdump");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_hexdump");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_hexdump");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_hexdump_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_hexdump");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_hexdump (guestfs_h *g,
+		const char *path)
+{
+  struct guestfs_hexdump_args args;
+  struct hexdump_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_hexdump") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.path = (char *) path;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_HEXDUMP,
+        (xdrproc_t) xdr_guestfs_hexdump_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, hexdump_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_hexdump");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_HEXDUMP, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.dump; /* caller will free */
+}
+
+struct zerofree_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void zerofree_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct zerofree_ctx *ctx = (struct zerofree_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_zerofree");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_zerofree");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_zerofree");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_zerofree (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_zerofree_args args;
+  struct zerofree_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_zerofree") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_ZEROFREE,
+        (xdrproc_t) xdr_guestfs_zerofree_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, zerofree_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_zerofree");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_ZEROFREE, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct pvresize_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void pvresize_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct pvresize_ctx *ctx = (struct pvresize_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_pvresize");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_pvresize");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_pvresize");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_pvresize (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_pvresize_args args;
+  struct pvresize_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_pvresize") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_PVRESIZE,
+        (xdrproc_t) xdr_guestfs_pvresize_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, pvresize_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_pvresize");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_PVRESIZE, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct sfdisk_N_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void sfdisk_N_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct sfdisk_N_ctx *ctx = (struct sfdisk_N_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_sfdisk_N");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_sfdisk_N");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_sfdisk_N");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_sfdisk_N (guestfs_h *g,
+		const char *device,
+		int n,
+		int cyls,
+		int heads,
+		int sectors,
+		const char *line)
+{
+  struct guestfs_sfdisk_N_args args;
+  struct sfdisk_N_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_sfdisk_N") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  args.n = n;
+  args.cyls = cyls;
+  args.heads = heads;
+  args.sectors = sectors;
+  args.line = (char *) line;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_SFDISK_N,
+        (xdrproc_t) xdr_guestfs_sfdisk_N_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, sfdisk_N_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_sfdisk_N");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SFDISK_N, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct sfdisk_l_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_sfdisk_l_ret ret;
+};
+
+static void sfdisk_l_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct sfdisk_l_ctx *ctx = (struct sfdisk_l_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_sfdisk_l");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_sfdisk_l");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_sfdisk_l");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_sfdisk_l_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_sfdisk_l");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_sfdisk_l (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_sfdisk_l_args args;
+  struct sfdisk_l_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_sfdisk_l") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_SFDISK_L,
+        (xdrproc_t) xdr_guestfs_sfdisk_l_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, sfdisk_l_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_sfdisk_l");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SFDISK_L, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.partitions; /* caller will free */
+}
+
+struct sfdisk_kernel_geometry_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_sfdisk_kernel_geometry_ret ret;
+};
+
+static void sfdisk_kernel_geometry_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct sfdisk_kernel_geometry_ctx *ctx = (struct sfdisk_kernel_geometry_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_sfdisk_kernel_geometry");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_sfdisk_kernel_geometry");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_sfdisk_kernel_geometry");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_sfdisk_kernel_geometry_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_sfdisk_kernel_geometry");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_sfdisk_kernel_geometry (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_sfdisk_kernel_geometry_args args;
+  struct sfdisk_kernel_geometry_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_sfdisk_kernel_geometry") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_SFDISK_KERNEL_GEOMETRY,
+        (xdrproc_t) xdr_guestfs_sfdisk_kernel_geometry_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, sfdisk_kernel_geometry_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_sfdisk_kernel_geometry");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SFDISK_KERNEL_GEOMETRY, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.partitions; /* caller will free */
+}
+
+struct sfdisk_disk_geometry_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+  struct guestfs_sfdisk_disk_geometry_ret ret;
+};
+
+static void sfdisk_disk_geometry_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct sfdisk_disk_geometry_ctx *ctx = (struct sfdisk_disk_geometry_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_sfdisk_disk_geometry");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_sfdisk_disk_geometry");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_sfdisk_disk_geometry");
+      return;
+    }
+    goto done;
+  }
+  if (!xdr_guestfs_sfdisk_disk_geometry_ret (xdr, &ctx->ret)) {
+    error (g, "%s: failed to parse reply", "guestfs_sfdisk_disk_geometry");
+    return;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+char *guestfs_sfdisk_disk_geometry (guestfs_h *g,
+		const char *device)
+{
+  struct guestfs_sfdisk_disk_geometry_args args;
+  struct sfdisk_disk_geometry_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_sfdisk_disk_geometry") == -1) return NULL;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.device = (char *) device;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_SFDISK_DISK_GEOMETRY,
+        (xdrproc_t) xdr_guestfs_sfdisk_disk_geometry_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, sfdisk_disk_geometry_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_sfdisk_disk_geometry");
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_SFDISK_DISK_GEOMETRY, serial) == -1) {
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return NULL;
+  }
+
+  guestfs_end_busy (g);
+  return ctx.ret.partitions; /* caller will free */
+}
+
+struct vg_activate_all_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void vg_activate_all_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct vg_activate_all_ctx *ctx = (struct vg_activate_all_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_vg_activate_all");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_vg_activate_all");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_vg_activate_all");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_vg_activate_all (guestfs_h *g,
+		int activate)
+{
+  struct guestfs_vg_activate_all_args args;
+  struct vg_activate_all_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_vg_activate_all") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.activate = activate;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_VG_ACTIVATE_ALL,
+        (xdrproc_t) xdr_guestfs_vg_activate_all_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, vg_activate_all_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_vg_activate_all");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VG_ACTIVATE_ALL, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs_end_busy (g);
+  return 0;
+}
+
+struct vg_activate_ctx {
+  /* This flag is set by the callbacks, so we know we've done
+   * the callbacks as expected, and in the right sequence.
+   * 0 = not called, 1 = reply_cb called.
+   */
+  int cb_sequence;
+  struct guestfs_message_header hdr;
+  struct guestfs_message_error err;
+};
+
+static void vg_activate_reply_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  struct vg_activate_ctx *ctx = (struct vg_activate_ctx *) data;
+
+  /* This should definitely not happen. */
+  if (ctx->cb_sequence != 0) {
+    ctx->cb_sequence = 9999;
+    error (g, "%s: internal error: reply callback called twice", "guestfs_vg_activate");
+    return;
+  }
+
+  ml->main_loop_quit (ml, g);
+
+  if (!xdr_guestfs_message_header (xdr, &ctx->hdr)) {
+    error (g, "%s: failed to parse reply header", "guestfs_vg_activate");
+    return;
+  }
+  if (ctx->hdr.status == GUESTFS_STATUS_ERROR) {
+    if (!xdr_guestfs_message_error (xdr, &ctx->err)) {
+      error (g, "%s: failed to parse reply error", "guestfs_vg_activate");
+      return;
+    }
+    goto done;
+  }
+ done:
+  ctx->cb_sequence = 1;
+}
+
+int guestfs_vg_activate (guestfs_h *g,
+		int activate,
+		char * const* const volgroups)
+{
+  struct guestfs_vg_activate_args args;
+  struct vg_activate_ctx ctx;
+  guestfs_main_loop *ml = guestfs_get_main_loop (g);
+  int serial;
+
+  if (check_state (g, "guestfs_vg_activate") == -1) return -1;
+  guestfs_set_busy (g);
+
+  memset (&ctx, 0, sizeof ctx);
+
+  args.activate = activate;
+  args.volgroups.volgroups_val = (char **) volgroups;
+  for (args.volgroups.volgroups_len = 0; volgroups[args.volgroups.volgroups_len]; args.volgroups.volgroups_len++) ;
+  serial = guestfs__send_sync (g, GUESTFS_PROC_VG_ACTIVATE,
+        (xdrproc_t) xdr_guestfs_vg_activate_args, (char *) &args);
+  if (serial == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  guestfs__switch_to_receiving (g);
+  ctx.cb_sequence = 0;
+  guestfs_set_reply_callback (g, vg_activate_reply_cb, &ctx);
+  (void) ml->main_loop_run (ml, g);
+  guestfs_set_reply_callback (g, NULL, NULL);
+  if (ctx.cb_sequence != 1) {
+    error (g, "%s reply failed, see earlier error messages", "guestfs_vg_activate");
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (check_reply_header (g, &ctx.hdr, GUESTFS_PROC_VG_ACTIVATE, serial) == -1) {
+    guestfs_end_busy (g);
+    return -1;
+  }
+
+  if (ctx.hdr.status == GUESTFS_STATUS_ERROR) {
+    error (g, "%s", ctx.err.error_message);
+    free (ctx.err.error_message);
+    guestfs_end_busy (g);
+    return -1;
+  }
 
+  guestfs_end_busy (g);
   return 0;
 }