+ struct cl_env_nest nest;
+ struct lu_env *env;
+ struct cl_io *io;
+ struct cl_object *clobj = NULL;
+ struct cl_page **pvec;
+ struct osc_page *opg;
+ int maxscan = 0;
+ int count = 0;
+ int index = 0;
+ int rc = 0;
+ ENTRY;
+
+ LASSERT(cfs_atomic_read(&cli->cl_lru_in_list) >= 0);
+ if (cfs_atomic_read(&cli->cl_lru_in_list) == 0 || target <= 0)
+ RETURN(0);
+
+ env = cl_env_nested_get(&nest);
+ if (IS_ERR(env))
+ RETURN(PTR_ERR(env));
+
+ pvec = osc_env_info(env)->oti_pvec;
+ io = &osc_env_info(env)->oti_io;
+
+ client_obd_list_lock(&cli->cl_lru_list_lock);
+ cfs_atomic_inc(&cli->cl_lru_shrinkers);
+ maxscan = min(target << 1, cfs_atomic_read(&cli->cl_lru_in_list));
+ while (!cfs_list_empty(&cli->cl_lru_list)) {
+ struct cl_page *page;
+
+ if (--maxscan < 0)
+ break;
+
+ opg = cfs_list_entry(cli->cl_lru_list.next, struct osc_page,
+ ops_lru);
+ page = cl_page_top(opg->ops_cl.cpl_page);
+ if (cl_page_in_use_noref(page)) {
+ cfs_list_move_tail(&opg->ops_lru, &cli->cl_lru_list);
+ continue;
+ }
+
+ LASSERT(page->cp_obj != NULL);
+ if (clobj != page->cp_obj) {
+ struct cl_object *tmp = page->cp_obj;
+
+ cl_object_get(tmp);
+ client_obd_list_unlock(&cli->cl_lru_list_lock);
+
+ if (clobj != NULL) {
+ count -= discard_pagevec(env, io, pvec, index);
+ index = 0;
+
+ cl_io_fini(env, io);
+ cl_object_put(env, clobj);
+ clobj = NULL;
+ }
+
+ clobj = tmp;
+ io->ci_obj = clobj;
+ io->ci_ignore_layout = 1;
+ rc = cl_io_init(env, io, CIT_MISC, clobj);
+
+ client_obd_list_lock(&cli->cl_lru_list_lock);
+
+ if (rc != 0)
+ break;
+
+ ++maxscan;
+ continue;
+ }
+
+ /* move this page to the end of list as it will be discarded
+ * soon. The page will be finally removed from LRU list in
+ * osc_page_delete(). */
+ cfs_list_move_tail(&opg->ops_lru, &cli->cl_lru_list);
+
+ /* it's okay to grab a refcount here w/o holding lock because
+ * it has to grab cl_lru_list_lock to delete the page. */
+ cl_page_get(page);
+ pvec[index++] = page;
+ if (++count >= target)
+ break;
+
+ if (unlikely(index == OTI_PVEC_SIZE)) {
+ client_obd_list_unlock(&cli->cl_lru_list_lock);
+ count -= discard_pagevec(env, io, pvec, index);
+ index = 0;
+
+ client_obd_list_lock(&cli->cl_lru_list_lock);
+ }
+ }
+ client_obd_list_unlock(&cli->cl_lru_list_lock);
+
+ if (clobj != NULL) {
+ count -= discard_pagevec(env, io, pvec, index);
+
+ cl_io_fini(env, io);
+ cl_object_put(env, clobj);
+ }
+ cl_env_nested_put(&nest, env);
+
+ cfs_atomic_dec(&cli->cl_lru_shrinkers);
+ RETURN(count > 0 ? count : rc);
+}