tools/libxl: remove unused function libxl__domain_save_device_model()

After the commit d77570e7, libxl__domain_save_device_model() is
completely unused and can be dropped.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

tools/libxl/libxl.c

@@ -1550,10 +1550,6 @@ static void stubdom_destroy_callback(libxl__egc *egc,
     dds->stubdom_finished = 1;
     savefile = libxl__device_model_savefile(gc, dis->domid);
     rc = libxl__remove_file(gc, savefile);
-    /*
-     * On suspend libxl__domain_save_device_model will have already
-     * unlinked the save file.
-     */
     if (rc) {
         LOG(ERROR, "failed to remove device-model savefile %s", savefile);
     }

tools/libxl/libxl_dom.c

@@ -1785,97 +1785,6 @@ static void stream_done(libxl__egc *egc,
     domain_save_done(egc, sws->dss, rc);
 }
 
-static void save_device_model_datacopier_done(libxl__egc *egc,
-     libxl__datacopier_state *dc, int rc, int onwrite, int errnoval);
-
-void libxl__domain_save_device_model(libxl__egc *egc,
-                                     libxl__domain_suspend_state *dss,
-                                     libxl__save_device_model_cb *callback)
-{
-    STATE_AO_GC(dss->ao);
-    struct stat st;
-    uint32_t qemu_state_len;
-    int rc;
-
-    dss->save_dm_callback = callback;
-
-    /* Convenience aliases */
-    const char *const filename = dss->dm_savefile;
-    const int fd = dss->fd;
-
-    libxl__datacopier_state *dc = &dss->save_dm_datacopier;
-    memset(dc, 0, sizeof(*dc));
-    dc->readwhat = GCSPRINTF("qemu save file %s", filename);
-    dc->ao = ao;
-    dc->readfd = -1;
-    dc->writefd = fd;
-    dc->maxsz = INT_MAX;
-    dc->bytes_to_read = -1;
-    dc->copywhat = GCSPRINTF("qemu save file for domain %"PRIu32, dss->domid);
-    dc->writewhat = "save/migration stream";
-    dc->callback = save_device_model_datacopier_done;
-
-    dc->readfd = open(filename, O_RDONLY);
-    if (dc->readfd < 0) {
-        LOGE(ERROR, "unable to open %s", dc->readwhat);
-        rc = ERROR_FAIL;
-        goto out;
-    }
-
-    if (fstat(dc->readfd, &st))
-    {
-        LOGE(ERROR, "unable to fstat %s", dc->readwhat);
-        rc = ERROR_FAIL;
-        goto out;
-    }
-
-    if (!S_ISREG(st.st_mode)) {
-        LOG(ERROR, "%s is not a plain file!", dc->readwhat);
-        rc = ERROR_FAIL;
-        goto out;
-    }
-
-    qemu_state_len = st.st_size;
-    LOG(DEBUG, "%s is %d bytes", dc->readwhat, qemu_state_len);
-
-    rc = libxl__datacopier_start(dc);
-    if (rc) goto out;
-
-    libxl__datacopier_prefixdata(egc, dc,
-                                 QEMU_SIGNATURE, strlen(QEMU_SIGNATURE));
-
-    libxl__datacopier_prefixdata(egc, dc,
-                                 &qemu_state_len, sizeof(qemu_state_len));
-    return;
-
- out:
-    save_device_model_datacopier_done(egc, dc, rc, -1, EIO);
-}
-
-static void save_device_model_datacopier_done(libxl__egc *egc,
-     libxl__datacopier_state *dc, int our_rc, int onwrite, int errnoval)
-{
-    libxl__domain_suspend_state *dss =
-        CONTAINER_OF(dc, *dss, save_dm_datacopier);
-    STATE_AO_GC(dss->ao);
-
-    /* Convenience aliases */
-    const char *const filename = dss->dm_savefile;
-    int rc;
-
-    libxl__datacopier_kill(dc);
-
-    if (dc->readfd >= 0) {
-        close(dc->readfd);
-        dc->readfd = -1;
-    }
-
-    rc = libxl__remove_file(gc, filename);
-    if (!our_rc) our_rc = rc;
-
-    dss->save_dm_callback(egc, dss, our_rc);
-}
-
 static void libxl__remus_teardown(libxl__egc *egc,
                                   libxl__domain_suspend_state *dss,
                                   int rc);

tools/libxl/libxl_internal.h

@@ -3103,9 +3103,6 @@ struct libxl__domain_suspend_state {
     libxl__logdirty_switch logdirty;
     void (*callback_common_done)(libxl__egc*,
                                  struct libxl__domain_suspend_state*, int ok);
-    /* private for libxl__domain_save_device_model */
-    libxl__save_device_model_cb *save_dm_callback;
-    libxl__datacopier_state save_dm_datacopier;
 };
 
 
@@ -3498,9 +3495,6 @@ static inline bool libxl__save_helper_inuse(const libxl__save_helper_state *shs)
 /* Each time the dm needs to be saved, we must call suspend and then save */
 _hidden int libxl__domain_suspend_device_model(libxl__gc *gc,
                                            libxl__domain_suspend_state *dss);
-_hidden void libxl__domain_save_device_model(libxl__egc *egc,
-                                     libxl__domain_suspend_state *dss,
-                                     libxl__save_device_model_cb *callback);
 
 _hidden const char *libxl__device_model_savefile(libxl__gc *gc, uint32_t domid);