From 8db83e2f87cc5377b7a0d3a895d05df37c4abba1 Mon Sep 17 00:00:00 2001
From: zhangxiaoyu <zhangxiaoyu58@huawei.com>
Date: Wed, 18 Oct 2023 11:01:26 +0800
Subject: [PATCH 1/2] remove isulad_cgfsng

Signed-off-by: zhangxiaoyu <zhangxiaoyu58@huawei.com>
---
 src/lxc/cgroups/isulad_cgfsng.c | 4137 -------------------------------
 1 file changed, 4137 deletions(-)
 delete mode 100644 src/lxc/cgroups/isulad_cgfsng.c

diff --git a/src/lxc/cgroups/isulad_cgfsng.c b/src/lxc/cgroups/isulad_cgfsng.c
deleted file mode 100644
index 1160af5..0000000
--- a/src/lxc/cgroups/isulad_cgfsng.c
+++ /dev/null
@@ -1,4137 +0,0 @@
-/******************************************************************************
- * Copyright (c) Huawei Technologies Co., Ltd. 2019. All rights reserved.
- * Author: lifeng
- * Create: 2020-11-02
- * Description: provide container definition
- * lxc: linux Container library
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
-  ******************************************************************************/
-
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE 1
-#endif
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <grp.h>
-#include <linux/kdev_t.h>
-#include <linux/types.h>
-#include <poll.h>
-#include <signal.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/epoll.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "af_unix.h"
-#include "caps.h"
-#include "cgroup.h"
-#include "cgroup2_devices.h"
-#include "cgroup_utils.h"
-#include "commands.h"
-#include "commands_utils.h"
-#include "conf.h"
-#include "config.h"
-#include "log.h"
-#include "macro.h"
-#include "mainloop.h"
-#include "memory_utils.h"
-#include "open_utils.h"
-#include "storage/storage.h"
-#include "utils.h"
-
-#if !HAVE_STRLCPY
-#include "include/strlcpy.h"
-#endif
-
-#if !HAVE_STRLCAT
-#include "include/strlcat.h"
-#endif
-
-#if HAVE_LIBSYSTEMD
-#include <systemd/sd-bus.h>
-#include <systemd/sd-event.h>
-#endif
-
-lxc_log_define(isulad_cgfsng, cgroup);
-
-/*
- * Given a pointer to a null-terminated array of pointers, realloc to add one
- * entry, and point the new entry to NULL. Do not fail. Return the index to the
- * second-to-last entry - that is, the one which is now available for use
- * (keeping the list null-terminated).
- */
-static int cg_list_add(void ***list)
-{
-	int idx = 0;
-	void **p;
-
-	if (*list)
-		for (; (*list)[idx]; idx++)
-			;
-
-	p = realloc(*list, (idx + 2) * sizeof(void **));
-	if (!p)
-		return ret_errno(ENOMEM);
-
-	p[idx + 1] = NULL;
-	*list = p;
-
-	return idx;
-}
-
-/* Given a null-terminated array of strings, check whether @entry is one of the
- * strings.
- */
-static bool string_in_list(char **list, const char *entry)
-{
-	if (!list)
-		return false;
-
-	for (int i = 0; list[i]; i++)
-		if (strcmp(list[i], entry) == 0)
-			return true;
-
-	return false;
-}
-
-/* Given a handler's cgroup data, return the struct hierarchy for the controller
- * @c, or NULL if there is none.
- */
-static struct hierarchy *get_hierarchy(const struct cgroup_ops *ops, const char *controller)
-{
-	if (!ops->hierarchies)
-		return log_trace_errno(NULL, errno, "There are no useable cgroup controllers");
-
-	for (int i = 0; ops->hierarchies[i]; i++) {
-		if (!controller) {
-			/* This is the empty unified hierarchy. */
-			if (ops->hierarchies[i]->controllers && !ops->hierarchies[i]->controllers[0])
-				return ops->hierarchies[i];
-
-			continue;
-		}
-
-		/*
-		 * Handle controllers with significant implementation changes
-		 * from cgroup to cgroup2.
-		 */
-		if (pure_unified_layout(ops)) {
-			if (strequal(controller, "devices")) {
-				if (device_utility_controller(ops->unified))
-					return ops->unified;
-
-				break;
-			} else if (strequal(controller, "freezer")) {
-				if (freezer_utility_controller(ops->unified))
-					return ops->unified;
-
-				break;
-			}
-		}
-
-		if (string_in_list(ops->hierarchies[i]->controllers, controller))
-			return ops->hierarchies[i];
-	}
-
-	if (controller)
-		WARN("There is no useable %s controller", controller);
-	else
-		WARN("There is no empty unified cgroup hierarchy");
-
-	return ret_set_errno(NULL, ENOENT);
-}
-
-int prepare_cgroup_fd(const struct cgroup_ops *ops, struct cgroup_fd *fd, bool limit)
-{
-	int dfd;
-	const struct hierarchy *h;
-
-	h = get_hierarchy(ops, fd->controller);
-	if (!h)
-		return ret_errno(ENOENT);
-
-	/*
-	 * The client requested that the controller must be in a specific
-	 * cgroup version.
-	 */
-	if (fd->type != 0 && (cgroupfs_type_magic_t)fd->type != h->fs_type)
-		return ret_errno(EINVAL);
-
-	if (limit)
-		dfd = h->dfd_con;
-	else
-		dfd = h->dfd_lim;
-	if (dfd < 0)
-		return ret_errno(EBADF);
-
-	fd->layout = ops->cgroup_layout;
-	fd->type = h->fs_type;
-	if (fd->type == UNIFIED_HIERARCHY)
-		fd->utilities = h->utilities;
-	fd->fd = dfd;
-
-	return 0;
-}
-
-#define BATCH_SIZE 50
-static void batch_realloc(char **mem, size_t oldlen, size_t newlen)
-{
-	int newbatches = (newlen / BATCH_SIZE) + 1;
-	int oldbatches = (oldlen / BATCH_SIZE) + 1;
-
-	if (!*mem || newbatches > oldbatches)
-		*mem = must_realloc(*mem, newbatches * BATCH_SIZE);
-}
-
-static void append_line(char **dest, size_t oldlen, char *new, size_t newlen)
-{
-	size_t full = oldlen + newlen;
-
-	batch_realloc(dest, oldlen, full + 1);
-
-	memcpy(*dest + oldlen, new, newlen + 1);
-}
-
-/* Slurp in a whole file */
-static char *read_file(const char *fnam)
-{
-	__do_free char *buf = NULL, *line = NULL;
-	__do_fclose FILE *f = NULL;
-	size_t len = 0, fulllen = 0;
-	int linelen;
-
-	f = fopen(fnam, "re");
-	if (!f)
-		return NULL;
-
-	while ((linelen = getline(&line, &len, f)) != -1) {
-		append_line(&buf, fulllen, line, linelen);
-		fulllen += linelen;
-	}
-
-	return move_ptr(buf);
-}
-
-static inline bool is_unified_hierarchy(const struct hierarchy *h)
-{
-	return h->fs_type == UNIFIED_HIERARCHY;
-}
-
-static char *trim(char *s)
-{
-	size_t len;
-
-	len = strlen(s);
-	while ((len > 1) && (s[len - 1] == '\n'))
-		s[--len] = '\0';
-
-	return s;
-}
-
-/* Return true if the controller @entry is found in the null-terminated list of
- * hierarchies @hlist.
- */
-static bool controller_available(struct hierarchy **hlist, char *entry)
-{
-	if (!hlist)
-		return false;
-
-	for (int i = 0; hlist[i]; i++)
-		if (string_in_list(hlist[i]->controllers, entry))
-			return true;
-
-	return false;
-}
-
-static bool controllers_available(struct cgroup_ops *ops)
-{
-	struct hierarchy **hlist;
-
-	if (!ops->cgroup_use)
-		return true;
-
-	hlist = ops->hierarchies;
-	for (char **cur = ops->cgroup_use; cur && *cur; cur++)
-		if (!controller_available(hlist, *cur))
-			return log_error(false, "The %s controller found", *cur);
-
-	return true;
-}
-
-static char **list_new(void)
-{
-	__do_free_string_list char **list = NULL;
-	int idx;
-
-	idx = cg_list_add((void ***)&list);
-	if (idx < 0)
-		return NULL;
-
-	list[idx] = NULL;
-	return move_ptr(list);
-}
-
-static int list_add_string(char ***list, char *entry)
-{
-	__do_free char *dup = NULL;
-	int idx;
-
-	dup = strdup(entry);
-	if (!dup)
-		return ret_errno(ENOMEM);
-
-	idx = cg_list_add((void ***)list);
-	if (idx < 0)
-		return idx;
-
-	(*list)[idx] = move_ptr(dup);
-	return 0;
-}
-
-static char **list_add_controllers(char *controllers)
-{
-	__do_free_string_list char **list = NULL;
-	char *it;
-
-	lxc_iterate_parts(it, controllers, ", \t\n") {
-		int ret;
-
-		ret = list_add_string(&list, it);
-		if (ret < 0)
-			return NULL;
-	}
-
-	return move_ptr(list);
-}
-
-static char **unified_controllers(int dfd, const char *file)
-{
-	__do_free char *buf = NULL;
-
-	buf = read_file_at(dfd, file, PROTECT_OPEN, 0);
-	if (!buf)
-		return NULL;
-
-	return list_add_controllers(buf);
-}
-
-static bool skip_hierarchy(const struct cgroup_ops *ops, char **controllers)
-{
-	if (!ops->cgroup_use)
-		return false;
-
-	for (char **cur_ctrl = controllers; cur_ctrl && *cur_ctrl; cur_ctrl++) {
-		bool found = false;
-
-		for (char **cur_use = ops->cgroup_use; cur_use && *cur_use; cur_use++) {
-			if (!strequal(*cur_use, *cur_ctrl))
-				continue;
-
-			found = true;
-			break;
-		}
-
-		if (found)
-			continue;
-
-		return true;
-	}
-
-	return false;
-}
-
-static int cgroup_hierarchy_add(struct cgroup_ops *ops, int dfd_mnt, char *mnt,
-				int dfd_base, char *base_cgroup,
-				char **controllers, cgroupfs_type_magic_t fs_type)
-{
-	__do_free struct hierarchy *new = NULL;
-	int idx;
-
-	if (abspath(base_cgroup))
-		return syserror_set(-EINVAL, "Container base path must be relative to controller mount");
-
-	new = zalloc(sizeof(*new));
-	if (!new)
-		return ret_errno(ENOMEM);
-
-	new->dfd_con		= -EBADF;
-	new->dfd_lim		= -EBADF;
-	new->dfd_mon		= -EBADF;
-
-	new->fs_type		= fs_type;
-	new->controllers	= controllers;
-	new->at_mnt		= mnt;
-	new->at_base		= base_cgroup;
-
-	new->dfd_mnt		= dfd_mnt;
-	new->dfd_base		= dfd_base;
-
-	TRACE("Adding cgroup hierarchy mounted at %s and base cgroup %s",
-	      mnt, maybe_empty(base_cgroup));
-	for (char *const *it = new->controllers; it && *it; it++)
-		TRACE("The hierarchy contains the %s controller", *it);
-
-	idx = cg_list_add((void ***)&ops->hierarchies);
-	if (idx < 0)
-		return ret_errno(idx);
-
-	if (fs_type == UNIFIED_HIERARCHY)
-		ops->unified = new;
-	(ops->hierarchies)[idx] = move_ptr(new);
-
-	return 0;
-}
-
-struct generic_userns_exec_data {
-	struct hierarchy **hierarchies;
-	const char *path_prune;
-	struct lxc_conf *conf;
-	uid_t origuid; /* target uid in parent namespace */
-	char *path;
-};
-
-static int isulad_cgroup_tree_remove(struct hierarchy **hierarchies,
-			const char *container_cgroup)
-{
-	if (!container_cgroup || !hierarchies)
-		return 0;
-
-	for (int i = 0; hierarchies[i]; i++) {
-		struct hierarchy *h = hierarchies[i];
-		int ret;
-
-		if (!h->path_con) {
-			h->path_con = must_make_path(h->at_mnt, h->at_base, container_cgroup, NULL);
-		}
-
-		ret = lxc_rm_rf(h->path_con);
-		if (ret < 0) {
-			if (errno == ENOENT) {
-				WARN("Destroy path: \"%s\" do not exist", h->path_con);
-				return 0;
-			}
-			SYSERROR("Failed to destroy \"%s\"", h->path_con);
-			return -1;
-		}
-
-		free_disarm(h->path_con);
-	}
-
-	return 0;
-}
-
-static int isulad_cgroup_tree_remove_wrapper(void *data)
-{
-	struct generic_userns_exec_data *arg = data;
-	uid_t nsuid = (arg->conf->root_nsuid_map != NULL) ? 0 : arg->conf->init_uid;
-	gid_t nsgid = (arg->conf->root_nsgid_map != NULL) ? 0 : arg->conf->init_gid;
-	int ret;
-
-	if (!lxc_drop_groups() && errno != EPERM)
-		return log_error_errno(-1, errno, "Failed to setgroups(0, NULL)");
-
-	ret = setresgid(nsgid, nsgid, nsgid);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to setresgid(%d, %d, %d)",
-				       (int)nsgid, (int)nsgid, (int)nsgid);
-
-	ret = setresuid(nsuid, nsuid, nsuid);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to setresuid(%d, %d, %d)",
-				       (int)nsuid, (int)nsuid, (int)nsuid);
-
-	return isulad_cgroup_tree_remove(arg->hierarchies, arg->path_prune);
-}
-
-__cgfsng_ops static bool isulad_cgfsng_payload_destroy(struct cgroup_ops *ops,
-						struct lxc_handler *handler)
-{
-	int ret;
-
-	if (!ops) {
-		ERROR("Called with uninitialized cgroup operations");
-		return false;
-	}
-
-	if (ops->no_controller) {
-		DEBUG("no controller found, ignore isulad_cgfsng_payload_destroy");
-		return true;
-	}
-
-	if (!ops->hierarchies) {
-		DEBUG("no hierarchies found, ignore isulad_cgfsng_payload_destroy");
-		return true;
-	}
-
-	if (!handler) {
-		ERROR("Called with uninitialized handler");
-		return false;
-	}
-
-	if (!handler->conf) {
-		ERROR("Called with uninitialized conf");
-		return false;
-	}
-
-#ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX
-	ret = bpf_program_cgroup_detach(handler->conf->cgroup2_devices);
-	if (ret < 0)
-		WARN("Failed to detach bpf program from cgroup");
-#endif
-
-	if (!list_empty(&handler->conf->id_map) && !handler->am_root) {
-		struct generic_userns_exec_data wrap = {
-			.conf			= handler->conf,
-			.path_prune		= ops->container_limit_cgroup,
-			.hierarchies		= ops->hierarchies,
-			.origuid		= 0,
-		};
-		ret = userns_exec_1(handler->conf, isulad_cgroup_tree_remove_wrapper,
-				    &wrap, "cgroup_tree_remove_wrapper");
-	} else {
-		ret = isulad_cgroup_tree_remove(ops->hierarchies, ops->container_cgroup);
-	}
-	if (ret < 0) {
-		SYSWARN("Failed to destroy cgroups");
-		return false;
-	}
-
-	return true;
-}
-
-__cgfsng_ops static void isulad_cgfsng_monitor_destroy(struct cgroup_ops *ops,
-						struct lxc_handler *handler)
-{
-	return;
-}
-
-#define SYSTEMD_SCOPE_FAILED 2
-#define SYSTEMD_SCOPE_UNSUPP 1
-#define SYSTEMD_SCOPE_SUCCESS 0
-
-#if HAVE_LIBSYSTEMD
-struct sd_callback_data {
-	char *scope_name;
-	bool job_complete;
-};
-
-static int systemd_jobremoved_callback(sd_bus_message *m, void *userdata, sd_bus_error *error)
-{
-	char *path, *unit, *result;
-	struct sd_callback_data *sd_data = userdata;
-	uint32_t id;
-	int r;
-
-	r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result);
-	if (r < 0)
-		return log_error(-1, "bad message received in callback: %s", strerror(-r));
-
-	if (sd_data->scope_name && strcmp(unit, sd_data->scope_name) != 0)
-		return log_trace(-1, "unit was '%s' not '%s'", unit, sd_data->scope_name);
-	if (strcmp(result, "done") == 0) {
-		sd_data->job_complete = true;
-		return log_info(1, "job is done");
-	}
-	return log_debug(0, "result was '%s', not 'done'", result);
-}
-
-#define DESTINATION "org.freedesktop.systemd1"
-#define PATH "/org/freedesktop/systemd1"
-#define INTERFACE "org.freedesktop.systemd1.Manager"
-#define MEMBER "StartTransientUnit"
-static bool start_scope(sd_bus *bus, struct sd_callback_data *data, struct sd_event *event)
-{
-	__attribute__((__cleanup__(sd_bus_error_free))) sd_bus_error error = SD_BUS_ERROR_NULL;;
-	__attribute__((__cleanup__(sd_bus_message_unrefp))) sd_bus_message *reply = NULL;
-	__attribute__((__cleanup__(sd_bus_message_unrefp))) sd_bus_message *m = NULL;
-	char *path = NULL;
-	int r;
-
-	r = sd_bus_message_new_method_call(bus, &m,
-		DESTINATION, PATH, INTERFACE, MEMBER);
-	if (r < 0)
-		return log_error(false, "Failed creating sdbus message");
-
-	r = sd_bus_message_append(m, "ss", data->scope_name, "fail");
-	if (r < 0)
-		return log_error(false, "Failed setting systemd scope name");
-
-	r = sd_bus_message_open_container(m, 'a', "(sv)");
-	if (r < 0)
-		return log_error(false, "Failed allocating sdbus msg properties");
-
-	r = sd_bus_message_append(m, "(sv)(sv)(sv)",
-		"PIDs", "au", 1, getpid(),
-		"Delegate", "b", 1,
-		"CollectMode", "s", "inactive-or-failed");
-	if (r < 0)
-		return log_error(false, "Failed setting properties on sdbus message");
-
-	r = sd_bus_message_close_container(m);
-	if (r < 0)
-		return log_error(false, "Failed closing sdbus message properties");
-
-	r = sd_bus_message_append(m, "a(sa(sv))", 0);
-	if (r < 0)
-		return log_error(false, "Failed appending aux boilerplate\n");
-
-	r = sd_bus_call(NULL, m, 0, &error, &reply);
-	if (r < 0)
-		return log_error(false,  "Failed sending sdbus message: %s", error.message);
-
-	/* Parse the response message */
-	r = sd_bus_message_read(reply, "o", &path);
-	if (r < 0)
-		return log_error(false, "Failed to parse response message: %s", strerror(-r));
-
-	/* Now spin up a mini-event-loop to wait for the "job completed" message */
-	int tries = 0;
-
-	while (!data->job_complete) {
-		r = sd_event_run(event, 1000 * 1000);
-		if (r < 0) {
-			log_debug(stderr, "Error waiting for JobRemoved: %s\n", strerror(-r));
-			continue;
-		}
-		if (data->job_complete || tries == 5)
-			break;
-		if (r > 0) {
-			log_trace(stderr, "Debug: we processed an event (%d), but not the one we wanted\n", r);
-			continue;
-		}
-		if (r == 0) // timeout
-			tries++;
-	}
-	if (!data->job_complete) {
-		return log_error(false, "Error: %s job was never removed", data->scope_name);
-	}
-	return true;
-}
-
-static bool string_pure_unified_system(char *contents)
-{
-	char *p;
-	bool first_line_read = false;
-
-	lxc_iterate_parts(p, contents, "\n") {
-		if (first_line_read) // if >1 line, this is not pure unified
-			return false;
-		first_line_read = true;
-
-		if (strlen(p) > 3 && strncmp(p, "0:", 2) == 0)
-			return true;
-	}
-
-	return false;
-}
-
-/*
- * Only call get_current_unified_cgroup() when we are in a pure
- * unified (v2-only) cgroup
- */
-static char *get_current_unified_cgroup(void)
-{
-	__do_free char *buf = NULL;
-	__do_free_string_list char **list = NULL;
-	char *p;
-
-	buf = read_file_at(-EBADF, "/proc/self/cgroup", PROTECT_OPEN, 0);
-	if (!buf)
-		return NULL;
-
-	if (!string_pure_unified_system(buf))
-		return NULL;
-
-	// 0::/user.slice/user-1000.slice/session-136.scope
-	// Get past the "0::"
-	p = buf;
-	if (strnequal(p, "0::", STRLITERALLEN("0::")))
-		p += STRLITERALLEN("0::");
-
-	return strdup(p);
-}
-
-static bool pure_unified_system(void)
-{
-	__do_free char *buf = NULL;
-
-	buf = read_file_at(-EBADF, "/proc/self/cgroup", PROTECT_OPEN, 0);
-	if (!buf)
-		return false;
-
-	return string_pure_unified_system(buf);
-}
-
-#define MEMBER_JOIN "AttachProcessesToUnit"
-static bool enter_scope(char *scope_name, pid_t pid)
-{
-	__attribute__((__cleanup__(sd_bus_unrefp))) sd_bus *bus = NULL;
-	__attribute__((__cleanup__(sd_bus_error_free))) sd_bus_error error = SD_BUS_ERROR_NULL;;
-	__attribute__((__cleanup__(sd_bus_message_unrefp))) sd_bus_message *reply = NULL;
-	__attribute__((__cleanup__(sd_bus_message_unrefp))) sd_bus_message *m = NULL;
-	int r;
-
-	r = sd_bus_open_user(&bus);
-	if (r < 0)
-		return log_error(false, "Failed to connect to user bus: %s", strerror(-r));
-
-	r = sd_bus_message_new_method_call(bus, &m,
-		DESTINATION, PATH, INTERFACE, MEMBER_JOIN);
-	if (r < 0)
-		return log_error(false, "Failed creating sdbus message");
-
-	r = sd_bus_message_append(m, "ssau", scope_name, "/init", 1, pid);
-	if (r < 0)
-		return log_error(false, "Failed setting systemd scope name");
-
-
-	r = sd_bus_call(NULL, m, 0, &error, &reply);
-	if (r < 0)
-		return log_error(false,  "Failed sending sdbus message: %s", error.message);
-
-	return true;
-}
-
-static bool enable_controllers_delegation(int fd_dir, char *cg)
-{
-	__do_free char *rbuf = NULL;
-	__do_free char *wbuf = NULL;
-	__do_free_string_list char **cpulist = NULL;
-	char *controller;
-	size_t full_len = 0;
-	bool first = true;
-	int ret;
-
-	rbuf = read_file_at(fd_dir, "cgroup.controllers", PROTECT_OPEN, 0);
-	if (!rbuf)
-		return false;
-
-	lxc_iterate_parts(controller, rbuf, " ") {
-		full_len += strlen(controller) + 2;
-		wbuf = must_realloc(wbuf, full_len + 1);
-		if (first) {
-			wbuf[0] = '\0';
-			first = false;
-		} else {
-			(void)strlcat(wbuf, " ", full_len + 1);
-		}
-		strlcat(wbuf, "+", full_len + 1);
-		strlcat(wbuf, controller, full_len + 1);
-	}
-	if (!wbuf)
-		return log_debug(true, "No controllers to delegate!");
-
-	ret = lxc_writeat(fd_dir, "cgroup.subtree_control", wbuf, strlen(wbuf));
-	if (ret < 0)
-		return log_error_errno(false, errno, "Failed to write \"%s\" to %s/cgroup.subtree_control", wbuf, cg);
-
-	return true;
-}
-
-/*
- * systemd places us in say .../lxc-1.scope.  We create lxc-1.scope/init,
- * move ourselves to there, then enable controllers in lxc-1.scope
- */
-static bool move_and_delegate_unified(char *parent_cgroup)
-{
-	__do_free char *buf = NULL;
-	__do_close int fd_parent = -EBADF;
-	int ret;
-
-	fd_parent = open_at(-EBADF, parent_cgroup, O_DIRECTORY, 0, 0);
-	if (fd_parent < 0)
-		return syserror_ret(false, "Failed opening cgroup dir \"%s\"", parent_cgroup);
-
-	ret = mkdirat(fd_parent, "init", 0755);
-	if (ret < 0 && errno != EEXIST)
-		return syserror_ret(false, "Failed to create \"%d/init\" cgroup", fd_parent);
-
-	buf = read_file_at(fd_parent, "cgroup.procs", PROTECT_OPEN, 0);
-	if (!buf)
-		return false;
-
-	ret = lxc_writeat(fd_parent, "init/cgroup.procs", buf, strlen(buf));
-	if (ret)
-		return syserror_ret(false, "Failed to escape to cgroup \"init/cgroup.procs\"");
-
-	/* enable controllers in parent_cgroup */
-	return enable_controllers_delegation(fd_parent, parent_cgroup);
-}
-
-static int unpriv_systemd_create_scope(struct cgroup_ops *ops, struct lxc_conf *conf)
-{
-	__do_free char *full_scope_name = NULL;
-	__do_free char *fs_cg_path = NULL;
-	sd_event *event = NULL;
-	__attribute__((__cleanup__(sd_bus_unrefp))) sd_bus *bus = NULL; // free the bus before the names it references, just to be sure
-	struct sd_callback_data sd_data;
-	int idx = 0;
-	size_t len;
-	int r;
-
-	if (geteuid() == 0)
-		return log_info(SYSTEMD_SCOPE_UNSUPP, "Running privileged, not using a systemd unit");
-	// Pure_unified_layout() can't be used as that info is not yet setup.  At
-	// the same time, we don't want to calculate current cgroups until after
-	// we optionally enter a new systemd user scope.  So let's just do a quick
-	// check for pure unified cgroup system: single line /proc/self/cgroup with
-	// only index '0:'
-	if (!pure_unified_system())
-		return log_info(SYSTEMD_SCOPE_UNSUPP, "Not in unified layout, not using a systemd unit");
-
-	r = sd_bus_open_user(&bus);
-	if (r < 0)
-		return log_error(SYSTEMD_SCOPE_FAILED, "Failed to connect to user bus: %s", strerror(-r));
-
-	r = sd_bus_call_method_async(bus, NULL, DESTINATION, PATH, INTERFACE, "Subscribe", NULL, NULL, NULL);
-	if (r < 0)
-		return log_error(SYSTEMD_SCOPE_FAILED, "Failed to subscribe to signals: %s", strerror(-r));
-
-	sd_data.job_complete = false;
-	sd_data.scope_name = NULL;
-	r = sd_bus_match_signal(bus,
-		NULL, // no slot
-		DESTINATION, PATH, INTERFACE, "JobRemoved",
-		systemd_jobremoved_callback, &sd_data);
-	if (r < 0)
-		return log_error(SYSTEMD_SCOPE_FAILED, "Failed to register systemd event loop signal handler: %s", strerror(-r));
-
-	// NEXT: create and attach event
-	r = sd_event_new(&event);
-	if (r < 0)
-		return log_error(SYSTEMD_SCOPE_FAILED, "Failed allocating new event: %s\n", strerror(-r));
-	r = sd_bus_attach_event(bus, event, SD_EVENT_PRIORITY_NORMAL);
-	if (r < 0) {
-		// bus won't clean up event since the attach failed
-		sd_event_unrefp(&event);
-		return log_error(SYSTEMD_SCOPE_FAILED, "Failed attaching event: %s\n", strerror(-r));
-	}
-
-	// "lxc-" + (conf->name) + "-NN" + ".scope" + '\0'
-	len = STRLITERALLEN("lxc-") + strlen(conf->name) + 3 + STRLITERALLEN(".scope") + 1;
-	full_scope_name = malloc(len);
-	if (!full_scope_name)
-		return syserror("Out of memory");
-
-	do {
-		r = strnprintf(full_scope_name, len, "lxc-%s-%d.scope", conf->name, idx);
-		if (r < 0)
-			return log_error_errno(-1, errno, "Failed to build scope name for \"%s\"", conf->name);
-		sd_data.scope_name = full_scope_name;
-		if (start_scope(bus, &sd_data, event)) {
-			conf->cgroup_meta.systemd_scope = get_current_unified_cgroup();
-			if (!conf->cgroup_meta.systemd_scope)
-				return log_trace(SYSTEMD_SCOPE_FAILED, "Out of memory");
-			fs_cg_path = must_make_path("/sys/fs/cgroup", conf->cgroup_meta.systemd_scope, NULL);
-			if (!move_and_delegate_unified(fs_cg_path))
-				return log_error(SYSTEMD_SCOPE_FAILED, "Failed delegating the controllers to our cgroup");
-			return log_trace(SYSTEMD_SCOPE_SUCCESS, "Created systemd scope %s", full_scope_name);
-		}
-		idx++;
-	} while (idx < 99);
-
-	return SYSTEMD_SCOPE_FAILED; // failed, let's try old-school after all
-}
-#else /* !HAVE_LIBSYSTEMD */
-static int unpriv_systemd_create_scope(struct cgroup_ops *ops, struct lxc_conf *conf)
-{
-	TRACE("unpriv_systemd_create_scope: no systemd support");
-	return SYSTEMD_SCOPE_UNSUPP; // not supported
-}
-#endif /* HAVE_LIBSYSTEMD */
-
-// Return a duplicate of cgroup path @cg without leading /, so
-// that caller can own+free it and be certain it's not abspath.
-static char *cgroup_relpath(char *cg)
-{
-	char *p;
-
-	if (!cg || strequal(cg, "/"))
-		return NULL;
-	p = strdup(deabs(cg));
-	if (!p)
-		return ERR_PTR(-ENOMEM);
-
-	return p;
-}
-
-__cgfsng_ops static inline bool isulad_cgfsng_monitor_create(struct cgroup_ops *ops,
-						      struct lxc_handler *handler)
-{
-	return true;
-}
-
-static bool isulad_copy_parent_file(char *path, char *file)
-{
-	int ret;
-	int len = 0;
-	char *value = NULL;
-	char *current = NULL;
-	char *fpath = NULL;
-	char *lastslash = NULL;
-	char oldv;
-
-	fpath = must_make_path(path, file, NULL);
-	current = read_file(fpath);
-
-	if (current == NULL) {
-		SYSERROR("Failed to read file \"%s\"", fpath);
-		free(fpath);
-		return false;
-	}
-
-	if (strcmp(current, "\n") != 0) {
-		free(fpath);
-		free(current);
-		return true;
-	}
-
-	free(fpath);
-	free(current);
-
-	lastslash = strrchr(path, '/');
-	if (lastslash == NULL) {
-		ERROR("Failed to detect \"/\" in \"%s\"", path);
-		return false;
-	}
-	oldv = *lastslash;
-	*lastslash = '\0';
-	fpath = must_make_path(path, file, NULL);
-	*lastslash = oldv;
-	len = lxc_read_from_file(fpath, NULL, 0);
-	if (len <= 0)
-		goto on_error;
-
-	value = must_realloc(NULL, len + 1);
-	ret = lxc_read_from_file(fpath, value, len);
-	if (ret != len)
-		goto on_error;
-	free(fpath);
-
-	fpath = must_make_path(path, file, NULL);
-	ret = lxc_write_to_file(fpath, value, len, false, 0666);
-	if (ret < 0)
-		SYSERROR("Failed to write \"%s\" to file \"%s\"", value, fpath);
-	free(fpath);
-	free(value);
-	return ret >= 0;
-
-on_error:
-	SYSERROR("Failed to read file \"%s\"", fpath);
-	free(fpath);
-	free(value);
-	return false;
-}
-
-static bool build_sub_cpuset_cgroup_dir(char *cgpath)
-{
-	int ret;
-
-	ret = mkdir_p(cgpath, 0755);
-	if (ret < 0) {
-		if (errno != EEXIST) {
-			SYSERROR("Failed to create directory \"%s\"", cgpath);
-			return false;
-		}
-	}
-
-	/* copy parent's settings */
-	if (!isulad_copy_parent_file(cgpath, "cpuset.cpus")) {
-		SYSERROR("Failed to copy \"cpuset.cpus\" settings");
-		return false;
-	}
-
-	/* copy parent's settings */
-	if (!isulad_copy_parent_file(cgpath, "cpuset.mems")) {
-		SYSERROR("Failed to copy \"cpuset.mems\" settings");
-		return false;
-	}
-
-	return true;
-}
-
-static bool isulad_cg_legacy_handle_cpuset_hierarchy(struct hierarchy *h, char *cgname)
-{
-	char *cgpath, *slash;
-	bool sub_mk_success = false;
-
-	if (is_unified_hierarchy(h))
-		return true;
-
-	if (!string_in_list(h->controllers, "cpuset"))
-		return true;
-
-	cgname += strspn(cgname, "/");
-
-	slash = strchr(cgname, '/');
-
-	if (slash != NULL) {
-		while (slash) {
-			*slash = '\0';
-			cgpath = must_make_path(h->at_mnt, h->at_base, cgname, NULL);
-			sub_mk_success = build_sub_cpuset_cgroup_dir(cgpath);
-			free(cgpath);
-			*slash = '/';
-			if (!sub_mk_success) {
-				return false;
-			}
-			slash = strchr(slash + 1, '/');
-		}
-	}
-
-	cgpath = must_make_path(h->at_mnt, h->at_base, cgname, NULL);
-	sub_mk_success = build_sub_cpuset_cgroup_dir(cgpath);
-	free(cgpath);
-	if (!sub_mk_success) {
-		return false;
-	}
-
-	return true;
-}
-
-static int isulad_mkdir_eexist_on_last(const char *dir, mode_t mode)
-{
-	const char *tmp = dir;
-	const char *orig = dir;
-
-	do {
-		int ret;
-		size_t cur_len;
-		char *makeme;
-
-		dir = tmp + strspn(tmp, "/");
-		tmp = dir + strcspn(dir, "/");
-
-		errno = ENOMEM;
-		cur_len = dir - orig;
-		makeme = strndup(orig, cur_len);
-		if (!makeme)
-			return -1;
-
-		ret = mkdir(makeme, mode);
-		if (ret < 0) {
-			if (errno != EEXIST) {
-				SYSERROR("Failed to create directory \"%s\"", makeme);
-				free(makeme);
-				return -1;
-			}
-		}
-		free(makeme);
-
-	} while (tmp != dir);
-
-	return 0;
-}
-
-static bool create_path_for_hierarchy(struct hierarchy *h, char *cgname, int errfd)
-{
-	int ret;
-	__do_free char *path = NULL;
-
-	path = must_make_path(h->at_mnt, h->at_base, cgname, NULL);
-
-	if (file_exists(path)) { // it must not already exist
-		ERROR("Cgroup path \"%s\" already exist.", path);
-		lxc_write_error_message(errfd, "%s:%d: Cgroup path \"%s\" already exist.",
-		                        __FILE__, __LINE__, path);
-		return false;
-	}
-
-	if (!isulad_cg_legacy_handle_cpuset_hierarchy(h, cgname)) {
-		ERROR("Failed to handle legacy cpuset controller");
-		return false;
-	}
-
-	ret = isulad_mkdir_eexist_on_last(path, 0755);
-	if (ret < 0) {
-		ERROR("Failed to create cgroup \"%s\"", path);
-		return false;
-	}
-
-	h->dfd_con = lxc_open_dirfd(path);
-	if (h->dfd_con < 0)
-		return log_error_errno(false, errno, "Failed to open %s", path);
-
-	if (h->path_con == NULL) {
-		h->path_con = move_ptr(path);
-	}
-
-	return true;
-}
-
-/* isulad: create hierarchies path, if fail, return the error */
-__cgfsng_ops static inline bool isulad_cgfsng_payload_create(struct cgroup_ops *ops,
-						      struct lxc_handler *handler)
-{
-	int i;
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-	char *container_cgroup = ops->container_cgroup;
-
-	if (!ops->hierarchies)
-		return true;
-
-#ifdef HAVE_ISULAD
-	if (ops->no_controller) {
-		DEBUG("no controller found, isgnore isulad_cgfsng_payload_create");
-		return true;
-	}
-#endif
-
-	if (!container_cgroup) {
-		ERROR("cgfsng_create container_cgroup is invalid");
-		return false;
-	}
-
-	for (i = 0; ops->hierarchies[i]; i++) {
-		if (!create_path_for_hierarchy(ops->hierarchies[i], container_cgroup, ops->errfd)) {
-			SYSERROR("Failed to create %s", ops->hierarchies[i]->path_con);
-			return false;
-		}
-	}
-
-	return true;
-}
-
-__cgfsng_ops static bool isulad_cgfsng_monitor_enter(struct cgroup_ops *ops,
-					      struct lxc_handler *handler)
-{
-	return true;
-}
-
-__cgfsng_ops static bool isulad_cgfsng_payload_enter(struct cgroup_ops *ops,
-					      struct lxc_handler *handler)
-{
-	int len;
-	char pidstr[INTTYPE_TO_STRLEN(pid_t)];
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-#ifdef HAVE_ISULAD
-	if (ops->no_controller) {
-		DEBUG("no controller found, isgnore isulad_cgfsng_payload_enter");
-		return true;
-	}
-#endif
-
-	if (!ops->hierarchies)
-		return true;
-
-	if (!ops->container_cgroup)
-		return ret_set_errno(false, ENOENT);
-
-	if (!handler || !handler->conf)
-		return ret_set_errno(false, EINVAL);
-
-	len = snprintf(pidstr, sizeof(pidstr), "%d", handler->pid);
-
-	for (int i = 0; ops->hierarchies[i]; i++) {
-		int ret;
-		char *fullpath;
-		int retry_count = 0;
-		int max_retry = 10;
-
-		fullpath = must_make_path(ops->hierarchies[i]->path_con,
-		                          "cgroup.procs", NULL);
-retry:
-		ret = lxc_write_to_file(fullpath, pidstr, len, false, 0666);
-		if (ret != 0) {
-			if (retry_count < max_retry) {
-				SYSERROR("Failed to enter cgroup \"%s\" with retry count:%d", fullpath, retry_count);
-				(void)isulad_cg_legacy_handle_cpuset_hierarchy(ops->hierarchies[i], ops->container_cgroup);
-				(void)isulad_mkdir_eexist_on_last(ops->hierarchies[i]->path_con, 0755);
-				usleep(100 * 1000); /* 100 millisecond */
-				retry_count++;
-				goto retry;
-			}
-			SYSERROR("Failed to enter cgroup \"%s\"", fullpath);
-			free(fullpath);
-			return false;
-		}
-		free(fullpath);
-	}
-
-	return true;
-}
-
-static int fchowmodat(int dirfd, const char *path, uid_t chown_uid,
-		      gid_t chown_gid, mode_t chmod_mode)
-{
-	int ret;
-
-	ret = fchownat(dirfd, path, chown_uid, chown_gid,
-		       AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW);
-	if (ret < 0)
-		return log_warn_errno(-1,
-				      errno, "Failed to fchownat(%d, %s, %d, %d, AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW )",
-				      dirfd, path, (int)chown_uid,
-				      (int)chown_gid);
-
-	ret = fchmodat(dirfd, (*path != '\0') ? path : ".", chmod_mode, 0);
-	if (ret < 0)
-		return log_warn_errno(-1, errno, "Failed to fchmodat(%d, %s, %d, AT_SYMLINK_NOFOLLOW)",
-				      dirfd, path, (int)chmod_mode);
-
-	return 0;
-}
-
-/* chgrp the container cgroups to container group.  We leave
- * the container owner as cgroup owner.  So we must make the
- * directories 775 so that the container can create sub-cgroups.
- *
- * Also chown the tasks and cgroup.procs files.  Those may not
- * exist depending on kernel version.
- */
-static int chown_cgroup_wrapper(void *data)
-{
-	int ret;
-	uid_t destuid;
-	struct generic_userns_exec_data *arg = data;
-	uid_t nsuid = (arg->conf->root_nsuid_map != NULL) ? 0 : arg->conf->init_uid;
-	gid_t nsgid = (arg->conf->root_nsgid_map != NULL) ? 0 : arg->conf->init_gid;
-
-	if (!lxc_drop_groups() && errno != EPERM)
-		return log_error_errno(-1, errno, "Failed to setgroups(0, NULL)");
-
-	ret = setresgid(nsgid, nsgid, nsgid);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to setresgid(%d, %d, %d)",
-				       (int)nsgid, (int)nsgid, (int)nsgid);
-
-	ret = setresuid(nsuid, nsuid, nsuid);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to setresuid(%d, %d, %d)",
-				       (int)nsuid, (int)nsuid, (int)nsuid);
-
-	destuid = get_ns_uid(arg->origuid);
-	if (destuid == LXC_INVALID_UID)
-		destuid = 0;
-
-	for (int i = 0; arg->hierarchies[i]; i++) {
-		int dirfd = arg->hierarchies[i]->dfd_con;
-
-		if (dirfd < 0)
-			return syserror_set(-EBADF, "Invalid cgroup file descriptor");
-
-		(void)fchowmodat(dirfd, "", destuid, nsgid, 0775);
-
-		/*
-		 * Failures to chown() these are inconvenient but not
-		 * detrimental We leave these owned by the container launcher,
-		 * so that container root can write to the files to attach.  We
-		 * chmod() them 664 so that container systemd can write to the
-		 * files (which systemd in wily insists on doing).
-		 */
-
-		if (arg->hierarchies[i]->fs_type == LEGACY_HIERARCHY)
-			(void)fchowmodat(dirfd, "tasks", destuid, nsgid, 0664);
-
-		(void)fchowmodat(dirfd, "cgroup.procs", destuid, nsgid, 0664);
-
-		if (arg->hierarchies[i]->fs_type != UNIFIED_HIERARCHY)
-			continue;
-
-		for (char **p = arg->hierarchies[i]->delegate; p && *p; p++)
-			(void)fchowmodat(dirfd, *p, destuid, nsgid, 0664);
-	}
-
-	return 0;
-}
-
-__cgfsng_ops static bool isulad_cgfsng_chown(struct cgroup_ops *ops,
-				      struct lxc_conf *conf)
-{
-	struct generic_userns_exec_data wrap;
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-	if (!ops->hierarchies)
-		return true;
-
-	if (!ops->container_cgroup)
-		return ret_set_errno(false, ENOENT);
-
-	if (!conf)
-		return ret_set_errno(false, EINVAL);
-
-	if (list_empty(&conf->id_map))
-		return true;
-
-	wrap.origuid = geteuid();
-	wrap.path = NULL;
-	wrap.hierarchies = ops->hierarchies;
-	wrap.conf = conf;
-
-	if (userns_exec_1(conf, chown_cgroup_wrapper, &wrap, "chown_cgroup_wrapper") < 0)
-		return log_error_errno(false, errno, "Error requesting cgroup chown in new user namespace");
-
-	return true;
-}
-
-__cgfsng_ops static void isulad_cgfsng_finalize(struct cgroup_ops *ops)
-{
-	if (!ops)
-		return;
-
-#ifdef HAVE_ISULAD
-	if (ops->no_controller) {
-		DEBUG("no controller found, isgnore isulad_cgfsng_payload_finalize");
-		return;
-	}
-#endif
-
-	if (!ops->hierarchies)
-		return;
-
-	for (int i = 0; ops->hierarchies[i]; i++) {
-		struct hierarchy *h = ops->hierarchies[i];
-
-		/* Close all monitor cgroup file descriptors. */
-		close_prot_errno_disarm(h->dfd_mon);
-	}
-	/* Close the cgroup root file descriptor. */
-	close_prot_errno_disarm(ops->dfd_mnt);
-
-	/*
-	 * The checking for freezer support should obviously be done at cgroup
-	 * initialization time but that doesn't work reliable. The freezer
-	 * controller has been demoted (rightly so) to a simple file located in
-	 * each non-root cgroup. At the time when the container is created we
-	 * might still be located in /sys/fs/cgroup and so checking for
-	 * cgroup.freeze won't tell us anything because this file doesn't exist
-	 * in the root cgroup. We could then iterate through /sys/fs/cgroup and
-	 * find an already existing cgroup and then check within that cgroup
-	 * for the existence of cgroup.freeze but that will only work on
-	 * systemd based hosts. Other init systems might not manage cgroups and
-	 * so no cgroup will exist. So we defer until we have created cgroups
-	 * for our container which means we check here.
-	 */
-        if (pure_unified_layout(ops) &&
-            !faccessat(ops->unified->dfd_con, "cgroup.freeze", F_OK,
-                       AT_SYMLINK_NOFOLLOW)) {
-		TRACE("Unified hierarchy supports freezer");
-		ops->unified->utilities |= FREEZER_CONTROLLER;
-        }
-}
-
-/* cgroup-full:* is done, no need to create subdirs */
-static inline bool cg_mount_needs_subdirs(int type)
-{
-	return !(type >= LXC_AUTO_CGROUP_FULL_RO);
-}
-
-/* After $rootfs/sys/fs/container/controller/the/cg/path has been created,
- * remount controller ro if needed and bindmount the cgroupfs onto
- * control/the/cg/path.
- */
-static int cg_legacy_mount_controllers(int type, struct hierarchy *h,
-				       char *controllerpath, char *cgpath,
-				       const char *container_cgroup)
-{
-	__do_free char *sourcepath = NULL;
-	int ret, remount_flags;
-	int flags = MS_BIND;
-
-	if (type == LXC_AUTO_CGROUP_RO || type == LXC_AUTO_CGROUP_MIXED) {
-		ret = mount(controllerpath, controllerpath, "cgroup", MS_BIND, NULL);
-		if (ret < 0)
-			return log_error_errno(-1, errno, "Failed to bind mount \"%s\" onto \"%s\"",
-					       controllerpath, controllerpath);
-
-		remount_flags = add_required_remount_flags(controllerpath,
-							   controllerpath,
-							   flags | MS_REMOUNT);
-		ret = mount(controllerpath, controllerpath, "cgroup",
-			    remount_flags | MS_REMOUNT | MS_BIND | MS_RDONLY,
-			    NULL);
-		if (ret < 0)
-			return log_error_errno(-1, errno, "Failed to remount \"%s\" ro", controllerpath);
-
-		INFO("Remounted %s read-only", controllerpath);
-	}
-
-	sourcepath = must_make_path(h->at_mnt, h->at_base,
-				    container_cgroup, NULL);
-	if (type == LXC_AUTO_CGROUP_RO)
-		flags |= MS_RDONLY;
-
-	ret = mount(sourcepath, cgpath, "cgroup", flags, NULL);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to mount \"%s\" onto \"%s\"",
-				       h->controllers[0], cgpath);
-	INFO("Mounted \"%s\" onto \"%s\"", h->controllers[0], cgpath);
-
-	if (flags & MS_RDONLY) {
-		remount_flags = add_required_remount_flags(sourcepath, cgpath,
-							   flags | MS_REMOUNT);
-		ret = mount(sourcepath, cgpath, "cgroup", remount_flags, NULL);
-		if (ret < 0)
-			return log_error_errno(-1, errno, "Failed to remount \"%s\" ro", cgpath);
-		INFO("Remounted %s read-only", cgpath);
-	}
-
-	INFO("Completed second stage cgroup automounts for \"%s\"", cgpath);
-	return 0;
-}
-
-/* __cgroupfs_mount
- *
- * Mount cgroup hierarchies directly without using bind-mounts. The main
- * uses-cases are mounting cgroup hierarchies in cgroup namespaces and mounting
- * cgroups for the LXC_AUTO_CGROUP_FULL option.
- */
-static int __cgroupfs_mount(int cgroup_automount_type, struct hierarchy *h,
-			    struct lxc_rootfs *rootfs, int dfd_mnt_cgroupfs,
-			    const char *hierarchy_mnt)
-{
-	__do_close int fd_fs = -EBADF;
-	unsigned int flags = 0;
-	char *fstype;
-	int ret;
-
-	if (dfd_mnt_cgroupfs < 0)
-		return ret_errno(EINVAL);
-
-	flags |= MOUNT_ATTR_NOSUID;
-	flags |= MOUNT_ATTR_NOEXEC;
-	flags |= MOUNT_ATTR_NODEV;
-	flags |= MOUNT_ATTR_RELATIME;
-
-	if ((cgroup_automount_type == LXC_AUTO_CGROUP_RO) ||
-	    (cgroup_automount_type == LXC_AUTO_CGROUP_FULL_RO) ||
-	    (cgroup_automount_type == LXC_AUTO_CGROUP2_RO))
-		flags |= MOUNT_ATTR_RDONLY;
-
-	if (is_unified_hierarchy(h))
-		fstype = "cgroup2";
-	else
-		fstype = "cgroup";
-
-	if (can_use_mount_api()) {
-		fd_fs = fs_prepare(fstype, -EBADF, "", 0, 0);
-		if (fd_fs < 0)
-			return log_error_errno(-errno, errno, "Failed to prepare filesystem context for %s", fstype);
-
-		if (!is_unified_hierarchy(h)) {
-			for (const char **it = (const char **)h->controllers; it && *it; it++) {
-				if (strnequal(*it, "name=", STRLITERALLEN("name=")))
-					ret = fs_set_property(fd_fs, "name", *it + STRLITERALLEN("name="));
-				else
-					ret = fs_set_property(fd_fs, *it, "");
-				if (ret < 0)
-					return log_error_errno(-errno, errno, "Failed to add %s controller to cgroup filesystem context %d(dev)", *it, fd_fs);
-			}
-		}
-
-		ret = fs_attach(fd_fs, dfd_mnt_cgroupfs, hierarchy_mnt,
-				PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_BENEATH,
-				flags);
-	} else {
-		__do_free char *controllers = NULL, *target = NULL;
-		unsigned int old_flags = 0;
-		const char *rootfs_mnt;
-
-		if (!is_unified_hierarchy(h)) {
-			controllers = lxc_string_join(",", (const char **)h->controllers, false);
-			if (!controllers)
-				return ret_errno(ENOMEM);
-		}
-
-		rootfs_mnt = get_rootfs_mnt(rootfs);
-		ret = mnt_attributes_old(flags, &old_flags);
-		if (ret)
-			return log_error_errno(-EINVAL, EINVAL, "Unsupported mount properties specified");
-
-		target = must_make_path(rootfs_mnt, DEFAULT_CGROUP_MOUNTPOINT, hierarchy_mnt, NULL);
-#ifdef HAVE_ISULAD
-		ret = safe_mount(NULL, target, fstype, old_flags, controllers, rootfs_mnt, NULL);
-#else
-		ret = safe_mount(NULL, target, fstype, old_flags, controllers, rootfs_mnt);
-#endif
-	}
-	if (ret < 0)
-		return log_error_errno(ret, errno, "Failed to mount %s filesystem onto %d(%s)",
-				       fstype, dfd_mnt_cgroupfs, maybe_empty(hierarchy_mnt));
-
-	DEBUG("Mounted cgroup filesystem %s onto %d(%s)",
-	      fstype, dfd_mnt_cgroupfs, maybe_empty(hierarchy_mnt));
-	return 0;
-}
-
-static inline int cgroupfs_mount(int cgroup_automount_type, struct hierarchy *h,
-				 struct lxc_rootfs *rootfs,
-				 int dfd_mnt_cgroupfs, const char *hierarchy_mnt)
-{
-	return __cgroupfs_mount(cgroup_automount_type, h, rootfs,
-				dfd_mnt_cgroupfs, hierarchy_mnt);
-}
-
-static inline int cgroupfs_bind_mount(int cgroup_automount_type, struct hierarchy *h,
-				      struct lxc_rootfs *rootfs,
-				      int dfd_mnt_cgroupfs,
-				      const char *hierarchy_mnt)
-{
-	switch (cgroup_automount_type) {
-	case LXC_AUTO_CGROUP_FULL_RO:
-		break;
-	case LXC_AUTO_CGROUP_FULL_RW:
-		break;
-	case LXC_AUTO_CGROUP_FULL_MIXED:
-		break;
-	default:
-		return 0;
-	}
-
-	return __cgroupfs_mount(cgroup_automount_type, h, rootfs,
-				dfd_mnt_cgroupfs, hierarchy_mnt);
-}
-
-/* __cg_mount_direct
- *
- * Mount cgroup hierarchies directly without using bind-mounts. The main
- * uses-cases are mounting cgroup hierarchies in cgroup namespaces and mounting
- * cgroups for the LXC_AUTO_CGROUP_FULL option.
- */
-static int __cg_mount_direct(int type, struct hierarchy *h,
-			     const char *controllerpath)
-{
-	 __do_free char *controllers = NULL;
-	 char *fstype = "cgroup2";
-	 unsigned long flags = 0;
-	 int ret;
-
-	 flags |= MS_NOSUID;
-	 flags |= MS_NOEXEC;
-	 flags |= MS_NODEV;
-	 flags |= MS_RELATIME;
-
-	 if (type == LXC_AUTO_CGROUP_RO || type == LXC_AUTO_CGROUP_FULL_RO)
-		 flags |= MS_RDONLY;
-
-	 if (h->fs_type != CGROUP2_SUPER_MAGIC) {
-		 controllers = lxc_string_join(",", (const char **)h->controllers, false);
-		 if (!controllers)
-			 return -ENOMEM;
-		 fstype = "cgroup";
-	}
-
-	ret = mount("cgroup", controllerpath, fstype, flags, controllers);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to mount \"%s\" with cgroup filesystem type %s",
-				       controllerpath, fstype);
-
-	DEBUG("Mounted \"%s\" with cgroup filesystem type %s", controllerpath, fstype);
-	return 0;
-}
-
-static inline int cg_mount_in_cgroup_namespace(int type, struct hierarchy *h,
-					       const char *controllerpath)
-{
-	return __cg_mount_direct(type, h, controllerpath);
-}
-
-static inline int cg_mount_cgroup_full(int type, struct hierarchy *h,
-				       const char *controllerpath)
-{
-	if (type < LXC_AUTO_CGROUP_FULL_RO || type > LXC_AUTO_CGROUP_FULL_MIXED)
-		return 0;
-
-	return __cg_mount_direct(type, h, controllerpath);
-}
-
-__cgfsng_ops static bool isulad_cgfsng_mount(struct cgroup_ops *ops,
-				      struct lxc_handler *handler, int cg_flags)
-{
-	__do_close int dfd_mnt_tmpfs = -EBADF, fd_fs = -EBADF;
-	__do_free char *cgroup_root = NULL;
-	int cgroup_automount_type;
-	bool in_cgroup_ns = false, wants_force_mount = false;
-	struct lxc_conf *conf = handler->conf;
-	struct lxc_rootfs *rootfs = &conf->rootfs;
-	const char *rootfs_mnt = get_rootfs_mnt(rootfs);
-	int ret;
-#ifdef HAVE_ISULAD
-	char **merged = NULL;
-	__do_free char *systemdpath = NULL;
-	__do_free char *unifiedpath = NULL;
-#endif
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-	if (!ops->hierarchies)
-		return true;
-
-	if (!conf)
-		return ret_set_errno(false, EINVAL);
-
-	if ((cg_flags & LXC_AUTO_CGROUP_MASK) == 0)
-		return log_trace(true, "No cgroup mounts requested");
-
-	if (cg_flags & LXC_AUTO_CGROUP_FORCE) {
-		cg_flags &= ~LXC_AUTO_CGROUP_FORCE;
-		wants_force_mount = true;
-	}
-
-	switch (cg_flags) {
-	case LXC_AUTO_CGROUP_RO:
-		TRACE("Read-only cgroup mounts requested");
-		break;
-	case LXC_AUTO_CGROUP_RW:
-		TRACE("Read-write cgroup mounts requested");
-		break;
-	case LXC_AUTO_CGROUP_MIXED:
-		TRACE("Mixed cgroup mounts requested");
-		break;
-	case LXC_AUTO_CGROUP_FULL_RO:
-		TRACE("Full read-only cgroup mounts requested");
-		break;
-	case LXC_AUTO_CGROUP_FULL_RW:
-		TRACE("Full read-write cgroup mounts requested");
-		break;
-	case LXC_AUTO_CGROUP_FULL_MIXED:
-		TRACE("Full mixed cgroup mounts requested");
-		break;
-	case LXC_AUTO_CGROUP2_RW:
-		TRACE("Read-write cgroup2 mount requested");
-		break;
-	case LXC_AUTO_CGROUP2_RO:
-		TRACE("Read-only cgroup2 mount requested");
-		break;
-	default:
-		return log_error_errno(false, EINVAL, "Invalid cgroup mount options specified");
-	}
-	cgroup_automount_type = cg_flags;
-
-	if (!wants_force_mount) {
-		wants_force_mount = !lxc_wants_cap(CAP_SYS_ADMIN, conf);
-
-		/*
-		 * Most recent distro versions currently have init system that
-		 * do support cgroup2 but do not mount it by default unless
-		 * explicitly told so even if the host is cgroup2 only. That
-		 * means they often will fail to boot. Fix this by pre-mounting
-		 * cgroup2 by default. We will likely need to be doing this a
-		 * few years until all distros have switched over to cgroup2 at
-		 * which point we can safely assume that their init systems
-		 * will mount it themselves.
-		 */
-		if (pure_unified_layout(ops))
-			wants_force_mount = true;
-	}
-
-	if (cgns_supported() && container_uses_namespace(handler, CLONE_NEWCGROUP))
-		in_cgroup_ns = true;
-
-	if (in_cgroup_ns && !wants_force_mount)
-		return log_trace(true, "Mounting cgroups not requested or needed");
-
-	/* This is really the codepath that we want. */
-	if (pure_unified_layout(ops) ||
-	    (cgroup_automount_type == LXC_AUTO_CGROUP2_RW) ||
-	    (cgroup_automount_type == LXC_AUTO_CGROUP2_RO)) {
-		__do_close int dfd_mnt_unified = -EBADF;
-
-		if (!ops->unified)
-			return log_error_errno(false, EINVAL, "No unified cgroup hierarchy mounted on the host");
-
-		dfd_mnt_unified = open_at(rootfs->dfd_mnt, DEFAULT_CGROUP_MOUNTPOINT_RELATIVE,
-					  PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_BENEATH_XDEV, 0);
-		if (dfd_mnt_unified < 0)
-			return syserror_ret(false, "Failed to open %d(%s)",
-					    rootfs->dfd_mnt, DEFAULT_CGROUP_MOUNTPOINT_RELATIVE);
-		/*
-		 * If cgroup namespaces are supported but the container will
-		 * not have CAP_SYS_ADMIN after it has started we need to mount
-		 * the cgroups manually.
-		 *
-		 * Note that here we know that wants_force_mount is true.
-		 * Otherwise we would've returned early above.
-		 */
-		if (in_cgroup_ns) {
-			/*
-			 *  1. cgroup:rw:force    -> Mount the cgroup2 filesystem.
-			 *  2. cgroup:ro:force    -> Mount the cgroup2 filesystem read-only.
-			 *  3. cgroup:mixed:force -> See comment above how this
-			 *                           does not apply so
-			 *                           cgroup:mixed is equal to
-			 *                           cgroup:rw when cgroup
-			 *                           namespaces are supported.
-
-			 *  4. cgroup:rw    -> No-op; init system responsible for mounting.
-			 *  5. cgroup:ro    -> No-op; init system responsible for mounting.
-			 *  6. cgroup:mixed -> No-op; init system responsible for mounting.
-                         *
-			 *  7. cgroup-full:rw    -> Not supported.
-			 *  8. cgroup-full:ro    -> Not supported.
-			 *  9. cgroup-full:mixed -> Not supported.
-
-			 * 10. cgroup-full:rw:force    -> Not supported.
-			 * 11. cgroup-full:ro:force    -> Not supported.
-			 * 12. cgroup-full:mixed:force -> Not supported.
-			 *
-			 * 13. cgroup2		-> No-op; init system responsible for mounting.
-			 * 14. cgroup2:ro	-> No-op; init system responsible for mounting.
-			 * 15. cgroup2:force	-> Mount the cgroup2 filesystem read-write
-			 * 16. cgroup2:ro:force	-> Mount the cgroup2 filesystem read-only
-			 */
-			ret = cgroupfs_mount(cgroup_automount_type, ops->unified, rootfs, dfd_mnt_unified, "");
-			if (ret < 0)
-				return syserror_ret(false, "Failed to force mount cgroup filesystem in cgroup namespace");
-
-			return log_trace(true, "Force mounted cgroup filesystem in new cgroup namespace");
-		} else {
-			/*
-			 * Either no cgroup namespace supported (highly
-			 * unlikely unless we're dealing with a Frankenkernel.
-			 * Or the user requested to keep the cgroup namespace
-			 * of the host or another container.
-			 */
-			errno = EOPNOTSUPP;
-			if (wants_force_mount)
-				SYSWARN("Force-mounting the unified cgroup hierarchy without cgroup namespace support is currently not supported");
-			else
-				SYSWARN("Mounting the unified cgroup hierarchy without cgroup namespace support is currently not supported");
-		}
-
-		return syserror_ret(false, "Failed to mount cgroups");
-	}
-
-	/*
-	 * Mount a tmpfs over DEFAULT_CGROUP_MOUNTPOINT. Note that we're
-	 * relying on RESOLVE_BENEATH so we need to skip the leading "/" in the
-	 * DEFAULT_CGROUP_MOUNTPOINT define.
-	 */
-	if (can_use_mount_api()) {
-		fd_fs = fs_prepare("tmpfs", -EBADF, "", 0, 0);
-		if (fd_fs < 0)
-			return log_error_errno(false, errno, "Failed to create new filesystem context for tmpfs");
-
-		ret = fs_set_property(fd_fs, "mode", "0755");
-		if (ret < 0)
-			return log_error_errno(false, errno, "Failed to mount tmpfs onto %d(dev)", fd_fs);
-
-		ret = fs_set_property(fd_fs, "size", "10240k");
-		if (ret < 0)
-			return log_error_errno(false, errno, "Failed to mount tmpfs onto %d(dev)", fd_fs);
-
-		ret = fs_attach(fd_fs, rootfs->dfd_mnt, DEFAULT_CGROUP_MOUNTPOINT_RELATIVE,
-				PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_BENEATH_XDEV,
-				MOUNT_ATTR_NOSUID | MOUNT_ATTR_NODEV |
-				MOUNT_ATTR_NOEXEC | MOUNT_ATTR_RELATIME);
-	} else {
-		cgroup_root = must_make_path(rootfs_mnt, DEFAULT_CGROUP_MOUNTPOINT, NULL);
-		ret = safe_mount(NULL, cgroup_root, "tmpfs",
-				 MS_NOSUID | MS_NODEV | MS_NOEXEC | MS_RELATIME,
-				 "size=10240k,mode=755", rootfs_mnt, handler->conf->rootfs.lsm_se_mount_context);
-	}
-	if (ret < 0)
-		return log_error_errno(false, errno, "Failed to mount tmpfs on %s",
-				       DEFAULT_CGROUP_MOUNTPOINT_RELATIVE);
-
-	dfd_mnt_tmpfs = open_at(rootfs->dfd_mnt, DEFAULT_CGROUP_MOUNTPOINT_RELATIVE,
-				PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_BENEATH_XDEV, 0);
-	if (dfd_mnt_tmpfs < 0)
-		return syserror_ret(false, "Failed to open %d(%s)",
-				    rootfs->dfd_mnt, DEFAULT_CGROUP_MOUNTPOINT_RELATIVE);
-
-	for (int i = 0; ops->hierarchies[i]; i++) {
-		__do_free char *hierarchy_mnt = NULL, *path2 = NULL;
-		struct hierarchy *h = ops->hierarchies[i];
-
-#ifdef HAVE_ISULAD
-		// isulad: symlink subcgroup
-		if (strchr(h->at_mnt, ',') != NULL) {
-			int pret;
-			pret = lxc_append_string(&merged, h->at_mnt);
-			if (pret < 0)
-				return false;
-		}
-#endif
-
-		ret = mkdirat(dfd_mnt_tmpfs, h->at_mnt, 0000);
-#ifdef HAVE_ISULAD
-		if (ret < 0) {
-			lxc_free_array((void **)merged, free);
-			return syserror_ret(false, "Failed to create cgroup at_mnt %d(%s)", dfd_mnt_tmpfs, h->at_mnt);
-		}
-#else
-		if (ret < 0)
-			return syserror_ret(false, "Failed to create cgroup at_mnt %d(%s)", dfd_mnt_tmpfs, h->at_mnt);
-#endif
-
-		if (in_cgroup_ns && wants_force_mount) {
-			/*
-			 * If cgroup namespaces are supported but the container
-			 * will not have CAP_SYS_ADMIN after it has started we
-			 * need to mount the cgroups manually.
-			 */
-			ret = cgroupfs_mount(cgroup_automount_type, h, rootfs,
-					     dfd_mnt_tmpfs, h->at_mnt);
-#ifdef HAVE_ISULAD
-			if (ret < 0) {
-				lxc_free_array((void **)merged, free);
-				return false;
-			}
-#else
-			if (ret < 0)
-				return false;
-#endif
-			continue;
-		}
-
-		/* Here is where the ancient kernel section begins. */
-		ret = cgroupfs_bind_mount(cgroup_automount_type, h, rootfs,
-					  dfd_mnt_tmpfs, h->at_mnt);
-#ifdef HAVE_ISULAD
-		if (ret < 0) {
-			lxc_free_array((void **)merged, free);
-			return false;
-		}
-#else
-		if (ret < 0)
-			return false;
-#endif
-
-		if (!cg_mount_needs_subdirs(cgroup_automount_type))
-			continue;
-
-		if (!cgroup_root)
-			cgroup_root = must_make_path(rootfs_mnt, DEFAULT_CGROUP_MOUNTPOINT, NULL);
-
-		hierarchy_mnt = must_make_path(cgroup_root, h->at_mnt, NULL);
-#ifdef HAVE_ISULAD
-		// isulad: ignore ops->container_cgroup so we will not see directory lxc after /sys/fs/cgroup/xxx in container,
-		// isulad: ignore h->container_base_path so we will not see subgroup of /sys/fs/cgroup/xxx/subgroup in container
-		path2 = must_make_path(h->at_mnt, NULL);
-#else
-		path2 = must_make_path(hierarchy_mnt, h->at_base,
-				       ops->container_cgroup, NULL);
-#endif
-		ret = mkdir_p(path2, 0755);
-#ifdef HAVE_ISULAD
-		if (ret < 0 && (errno != EEXIST)) {
-			lxc_free_array((void **)merged, free);
-			return false;
-		}
-#else
-		if (ret < 0 && (errno != EEXIST))
-			return false;
-#endif
-
-		ret = cg_legacy_mount_controllers(cgroup_automount_type, h,
-						  hierarchy_mnt, path2,
-						  ops->container_cgroup);
-#ifdef HAVE_ISULAD
-		if (ret < 0) {
-			lxc_free_array((void **)merged, free);
-			return false;
-		}
-#else
-		if (ret < 0)
-			return false;
-#endif
-	}
-
-#ifdef HAVE_ISULAD
-	// isulad: symlink subcgroup
-	if (merged) {
-		char **mc = NULL;
-		for (mc = merged; *mc; mc++) {
-			char *token = NULL;
-			char *copy = must_copy_string(*mc);
-			lxc_iterate_parts(token, copy, ",") {
-				int mret;
-				char *link;
-				link = must_make_path(cgroup_root, token, NULL);
-				mret = symlink(*mc, link);
-				if (mret < 0 && errno != EEXIST) {
-					SYSERROR("Failed to create link %s for target %s", link, *mc);
-					free(copy);
-					free(link);
-					lxc_free_array((void **)merged, free);
-					return false;
-				}
-				free(link);
-			}
-			free(copy);
-		}
-	}
-
-	// isulad: remount /sys/fs/cgroup to readonly
-	if (cg_flags == LXC_AUTO_CGROUP_FULL_RO || cg_flags == LXC_AUTO_CGROUP_RO) {
-		ret = mount(cgroup_root, cgroup_root, "bind",
-		            MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_RELATIME|MS_RDONLY|MS_BIND|MS_REMOUNT, NULL);
-		if (ret < 0) {
-			SYSERROR("Failed to remount /sys/fs/cgroup.");
-			lxc_free_array((void **)merged, free);
-			return false;
-		}
-	}
-
-	// isulad: remount /sys/fs/cgroup/systemd to readwrite for system container
-	if (handler->conf->systemd != NULL && strcmp(handler->conf->systemd, "true") == 0)
-	{
-		unifiedpath = must_make_path(get_rootfs_mnt(rootfs), "/sys/fs/cgroup/unified", NULL);
-		if (dir_exists(unifiedpath))
-		{
-			ret = umount2(unifiedpath, MNT_DETACH);
-			if (ret < 0)
-			{
-				SYSERROR("Failed to umount /sys/fs/cgroup/unified.");
-				lxc_free_array((void **)merged, free);
-				return false;
-			}
-		}
-
-		systemdpath = must_make_path(get_rootfs_mnt(rootfs), "/sys/fs/cgroup/systemd", NULL);
-		ret = mount(systemdpath, systemdpath, "bind",
-					MS_NOSUID | MS_NODEV | MS_NOEXEC | MS_RELATIME | MS_BIND | MS_REMOUNT, NULL);
-		if (ret < 0)
-		{
-			SYSERROR("Failed to remount /sys/fs/cgroup/systemd.");
-			lxc_free_array((void **)merged, free);
-			return false;
-		}
-	}
-#endif
-
-	return true;
-}
-
-/* Only root needs to escape to the cgroup of its init. */
-__cgfsng_ops static bool isulad_cgfsng_criu_escape(const struct cgroup_ops *ops,
-				       struct lxc_conf *conf)
-{
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-	if (!ops->hierarchies)
-		return true;
-
-	if (!conf)
-		return ret_set_errno(false, EINVAL);
-
-	if (conf->cgroup_meta.relative || geteuid())
-		return true;
-
-	for (int i = 0; ops->hierarchies[i]; i++) {
-		__do_free char *fullpath = NULL;
-		int ret;
-
-		fullpath =
-		    must_make_path(ops->hierarchies[i]->at_mnt,
-				   ops->hierarchies[i]->at_base,
-				   "cgroup.procs", NULL);
-		ret = lxc_write_to_file(fullpath, "0", 2, false, 0666);
-		if (ret != 0)
-			return log_error_errno(false, errno, "Failed to escape to cgroup \"%s\"", fullpath);
-	}
-
-	return true;
-}
-
-__cgfsng_ops static int isulad_cgfsng_criu_num_hierarchies(struct cgroup_ops *ops)
-{
-	int i = 0;
-
-	if (!ops)
-		return ret_set_errno(-1, ENOENT);
-
-	if (!ops->hierarchies)
-		return 0;
-
-	for (; ops->hierarchies[i]; i++)
-		;
-
-	return i;
-}
-
-__cgfsng_ops static bool isulad_cgfsng_criu_get_hierarchies(struct cgroup_ops *ops, int n,
-						char ***out)
-{
-	int i;
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-	if (!ops->hierarchies)
-		return ret_set_errno(false, ENOENT);
-
-	/* sanity check n */
-	for (i = 0; i < n; i++)
-		if (!ops->hierarchies[i])
-			return ret_set_errno(false, ENOENT);
-
-	*out = ops->hierarchies[i]->controllers;
-
-	return true;
-}
-
-static bool cg_legacy_freeze(struct cgroup_ops *ops)
-{
-	struct hierarchy *h;
-
-	h = get_hierarchy(ops, "freezer");
-	if (!h)
-		return ret_set_errno(-1, ENOENT);
-
-	return lxc_write_openat(h->path_con, "freezer.state",
-				"FROZEN", STRLITERALLEN("FROZEN"));
-}
-
-static int freezer_cgroup_events_cb(int fd, uint32_t events, void *cbdata,
-				    struct lxc_async_descr *descr)
-{
-	__do_close int duped_fd = -EBADF;
-	__do_free char *line = NULL;
-	__do_fclose FILE *f = NULL;
-	int state = PTR_TO_INT(cbdata);
-	size_t len;
-	const char *state_string;
-
-	duped_fd = dup(fd);
-	if (duped_fd < 0)
-		return LXC_MAINLOOP_ERROR;
-
-	if (lseek(duped_fd, 0, SEEK_SET) < (off_t)-1)
-		return LXC_MAINLOOP_ERROR;
-
-	f = fdopen(duped_fd, "re");
-	if (!f)
-		return LXC_MAINLOOP_ERROR;
-	move_fd(duped_fd);
-
-	if (state == 1)
-		state_string = "frozen 1";
-	else
-		state_string = "frozen 0";
-
-	while (getline(&line, &len, f) != -1)
-		if (strncmp(line, state_string, STRLITERALLEN("frozen") + 2) == 0)
-			return LXC_MAINLOOP_CLOSE;
-
-	return LXC_MAINLOOP_CONTINUE;
-}
-
-static int cg_unified_freeze(struct cgroup_ops *ops, int timeout)
-{
-	__do_close int fd = -EBADF;
-	call_cleaner(lxc_mainloop_close) struct lxc_async_descr *descr_ptr = NULL;
-	int ret;
-	struct lxc_async_descr descr;
-	struct hierarchy *h;
-
-	h = ops->unified;
-	if (!h)
-		return ret_set_errno(-1, ENOENT);
-
-	if (!h->path_con)
-		return ret_set_errno(-1, EEXIST);
-
-	if (timeout != 0) {
-		__do_free char *events_file = NULL;
-
-		events_file = must_make_path(h->path_con, "cgroup.events", NULL);
-		fd = open(events_file, O_RDONLY | O_CLOEXEC);
-		if (fd < 0)
-			return log_error_errno(-1, errno, "Failed to open cgroup.events file");
-
-		ret = lxc_mainloop_open(&descr);
-		if (ret)
-			return log_error_errno(-1, errno, "Failed to create epoll instance to wait for container freeze");
-
-		/* automatically cleaned up now */
-		descr_ptr = &descr;
-
-		ret = lxc_mainloop_add_handler(&descr, fd, freezer_cgroup_events_cb, default_cleanup_handler,
-									   INT_TO_PTR((int){1}), "freezer_cgroup_events");
-		if (ret < 0)
-			return log_error_errno(-1, errno, "Failed to add cgroup.events fd handler to mainloop");
-	}
-
-	ret = lxc_write_openat(h->path_con, "cgroup.freeze", "1", 1);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to open cgroup.freeze file");
-
-	if (timeout != 0 && lxc_mainloop(&descr, timeout))
-		return log_error_errno(-1, errno, "Failed to wait for container to be frozen");
-
-	return 0;
-}
-
-__cgfsng_ops static int isulad_cgfsng_freeze(struct cgroup_ops *ops, int timeout)
-{
-	if (!ops->hierarchies)
-		return ret_set_errno(-1, ENOENT);
-
-	if (ops->cgroup_layout != CGROUP_LAYOUT_UNIFIED)
-		return cg_legacy_freeze(ops);
-
-	return cg_unified_freeze(ops, timeout);
-}
-
-static int cg_legacy_unfreeze(struct cgroup_ops *ops)
-{
-	struct hierarchy *h;
-
-	h = get_hierarchy(ops, "freezer");
-	if (!h)
-		return ret_set_errno(-1, ENOENT);
-
-	return lxc_write_openat(h->path_con, "freezer.state",
-				"THAWED", STRLITERALLEN("THAWED"));
-}
-
-static int cg_unified_unfreeze(struct cgroup_ops *ops, int timeout)
-{
-	__do_close int fd = -EBADF;
-	call_cleaner(lxc_mainloop_close)struct lxc_async_descr *descr_ptr = NULL;
-	int ret;
-	struct lxc_async_descr descr;
-	struct hierarchy *h;
-
-	h = ops->unified;
-	if (!h)
-		return ret_set_errno(-1, ENOENT);
-
-	if (!h->path_con)
-		return ret_set_errno(-1, EEXIST);
-
-	if (timeout != 0) {
-		__do_free char *events_file = NULL;
-
-		events_file = must_make_path(h->path_con, "cgroup.events", NULL);
-		fd = open(events_file, O_RDONLY | O_CLOEXEC);
-		if (fd < 0)
-			return log_error_errno(-1, errno, "Failed to open cgroup.events file");
-
-		ret = lxc_mainloop_open(&descr);
-		if (ret)
-			return log_error_errno(-1, errno, "Failed to create epoll instance to wait for container unfreeze");
-
-		/* automatically cleaned up now */
-		descr_ptr = &descr;
-
-		ret = lxc_mainloop_add_handler(&descr, fd, freezer_cgroup_events_cb, default_cleanup_handler,
-									   INT_TO_PTR((int){0}), "freezer_cgroup_events");
-		if (ret < 0)
-			return log_error_errno(-1, errno, "Failed to add cgroup.events fd handler to mainloop");
-	}
-
-	ret = lxc_write_openat(h->path_con, "cgroup.freeze", "0", 1);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to open cgroup.freeze file");
-
-	if (timeout != 0 && lxc_mainloop(&descr, timeout))
-		return log_error_errno(-1, errno, "Failed to wait for container to be unfrozen");
-
-	return 0;
-}
-
-__cgfsng_ops static int isulad_cgfsng_unfreeze(struct cgroup_ops *ops, int timeout)
-{
-	if (!ops->hierarchies)
-		return ret_set_errno(-1, ENOENT);
-
-	if (ops->cgroup_layout != CGROUP_LAYOUT_UNIFIED)
-		return cg_legacy_unfreeze(ops);
-
-	return cg_unified_unfreeze(ops, timeout);
-}
-
-__cgfsng_ops static const char *isulad_cgfsng_get_cgroup(struct cgroup_ops *ops,
-						  const char *controller)
-{
-	struct hierarchy *h;
-
-	h = get_hierarchy(ops, controller);
-	if (!h)
-		return log_warn_errno(NULL, ENOENT, "Failed to find hierarchy for controller \"%s\"",
-				      controller ? controller : "(null)");
-
-	if (!h->path_con)
-		h->path_con = must_make_path(h->at_mnt, h->at_base, ops->container_cgroup, NULL);
-
-	return h->path_con
-		   ? h->path_con + strlen(h->at_mnt)
-		   : NULL;
-}
-
-__cgfsng_ops static const char *isulad_cgfsng_get_cgroup_full_path(struct cgroup_ops *ops,
-						  const char *controller)
-{
-	struct hierarchy *h;
-
-	h = get_hierarchy(ops, controller);
-	if (!h)
-		return log_warn_errno(NULL, ENOENT, "Failed to find hierarchy for controller \"%s\"",
-				      controller ? controller : "(null)");
-
-	if (!h->path_con)
-		h->path_con = must_make_path(h->at_mnt, h->at_base, ops->container_cgroup, NULL);
-
-	return h->path_con;
-}
-
-/* Given a cgroup path returned from lxc_cmd_get_cgroup_path, build a full path,
- * which must be freed by the caller.
- */
-static inline char *build_full_cgpath_from_monitorpath(struct hierarchy *h,
-						       const char *inpath,
-						       const char *filename)
-{
-	return must_make_path(h->at_mnt, inpath, filename, NULL);
-}
-
-static int cgroup_attach_leaf(const struct lxc_conf *conf, int unified_fd, pid_t pid)
-{
-	int idx = 1;
-	int ret;
-	char pidstr[INTTYPE_TO_STRLEN(int64_t) + 1];
-	size_t pidstr_len;
-
-	/* Create leaf cgroup. */
-	ret = mkdirat(unified_fd, ".lxc", 0755);
-	if (ret < 0 && errno != EEXIST)
-		return log_error_errno(-1, errno, "Failed to create leaf cgroup \".lxc\"");
-
-	pidstr_len = sprintf(pidstr, INT64_FMT, (int64_t)pid);
-	ret = lxc_writeat(unified_fd, ".lxc/cgroup.procs", pidstr, pidstr_len);
-	if (ret < 0)
-		ret = lxc_writeat(unified_fd, "cgroup.procs", pidstr, pidstr_len);
-	if (ret == 0)
-		return 0;
-
-	/* this is a non-leaf node */
-	if (errno != EBUSY)
-		return log_error_errno(-1, errno, "Failed to attach to unified cgroup");
-
-	do {
-		bool rm = false;
-		char attach_cgroup[STRLITERALLEN(".lxc-/cgroup.procs") + INTTYPE_TO_STRLEN(int) + 1];
-		char *slash;
-
-		ret = snprintf(attach_cgroup, sizeof(attach_cgroup), ".lxc-%d/cgroup.procs", idx);
-		if (ret < 0 || (size_t)ret >= sizeof(attach_cgroup))
-			return ret_errno(EIO);
-
-		/*
-		 * This shouldn't really happen but the compiler might complain
-		 * that a short write would cause a buffer overrun. So be on
-		 * the safe side.
-		 */
-		if ((size_t)ret < STRLITERALLEN(".lxc-/cgroup.procs"))
-			return log_error_errno(-EINVAL, EINVAL, "Unexpected short write would cause buffer-overrun");
-
-		slash = &attach_cgroup[ret] - STRLITERALLEN("/cgroup.procs");
-		*slash = '\0';
-
-		ret = mkdirat(unified_fd, attach_cgroup, 0755);
-		if (ret < 0 && errno != EEXIST)
-			return log_error_errno(-1, errno, "Failed to create cgroup %s", attach_cgroup);
-		if (ret == 0)
-			rm = true;
-
-		*slash = '/';
-
-		ret = lxc_writeat(unified_fd, attach_cgroup, pidstr, pidstr_len);
-		if (ret == 0)
-			return 0;
-
-		if (rm && unlinkat(unified_fd, attach_cgroup, AT_REMOVEDIR))
-			SYSERROR("Failed to remove cgroup \"%d(%s)\"", unified_fd, attach_cgroup);
-
-		/* this is a non-leaf node */
-		if (errno != EBUSY)
-			return log_error_errno(-1, errno, "Failed to attach to unified cgroup");
-
-		idx++;
-	} while (idx < 1000);
-
-	return log_error_errno(-1, errno, "Failed to attach to unified cgroup");
-}
-
-static int cgroup_attach_create_leaf(const struct lxc_conf *conf,
-				     int unified_fd, int *sk_fd, bool unprivileged)
-{
-	__do_close int sk = *sk_fd, target_fd0 = -EBADF, target_fd1 = -EBADF;
-	int target_fds[2];
-	ssize_t ret;
-
-	/* Create leaf cgroup. */
-	ret = mkdirat(unified_fd, ".lxc", 0755);
-	if (ret < 0 && errno != EEXIST)
-		return syserror("Failed to create leaf cgroup \".lxc\"");
-
-	if (unprivileged) {
-		target_fd0 = open_at(unified_fd, ".lxc/cgroup.procs", PROTECT_OPEN_W, PROTECT_LOOKUP_BENEATH, 0);
-		if (target_fd0 < 0)
-			return syserror("Failed to open \".lxc/cgroup.procs\"");
-		target_fds[0] = target_fd0;
-
-		target_fd1 = open_at(unified_fd, "cgroup.procs", PROTECT_OPEN_W, PROTECT_LOOKUP_BENEATH, 0);
-		if (target_fd1 < 0)
-			return syserror("Failed to open \".lxc/cgroup.procs\"");
-		target_fds[1] = target_fd1;
-
-		ret = lxc_abstract_unix_send_fds(sk, target_fds, 2, NULL, 0);
-		if (ret <= 0)
-			return syserror("Failed to send \".lxc/cgroup.procs\" fds %d and %d",
-					target_fd0, target_fd1);
-
-		TRACE("Sent cgroup file descriptors %d and %d", target_fd0, target_fd1);
-	} else {
-		ret = lxc_abstract_unix_send_credential(sk, NULL, 0);
-		if (ret < 0)
-			return syserror("Failed to inform parent that we are done setting up mounts");
-
-		TRACE("Informed parent process that cgroup has been created");
-	}
-
-	return 0;
-}
-
-static int cgroup_attach_move_into_leaf(const struct lxc_conf *conf,
-					const char *lxcpath,
-					int unified_fd, int *sk_fd, pid_t pid,
-					bool unprivileged)
-{
-	__do_close int sk = *sk_fd, target_fd0 = -EBADF, target_fd1 = -EBADF;
-	char pidstr[INTTYPE_TO_STRLEN(int64_t) + 1];
-	size_t pidstr_len;
-#if HAVE_LIBSYSTEMD
-	__do_free char *scope = NULL;
-#endif
-	ssize_t ret;
-
-#if HAVE_LIBSYSTEMD
-	scope = lxc_cmd_get_systemd_scope(conf->name, lxcpath);
-	if (scope) {
-		TRACE("%s:%s is running under systemd-created scope '%s'.  Attaching...", lxcpath, conf->name, scope);
-		if (enter_scope(scope, pid))
-			TRACE("Successfully entered scope '%s'", scope);
-		else
-			ERROR("Failed entering scope '%s'", scope);
-	} else {
-		TRACE("%s:%s is not running under a systemd-created scope", lxcpath, conf->name);
-	}
-#endif
-	if (unprivileged) {
-		ret = lxc_abstract_unix_recv_two_fds(sk, &target_fd0, &target_fd1);
-		if (ret < 0)
-			return log_error_errno(-1, errno, "Failed to receive target cgroup fd");
-	} else {
-		ret = lxc_abstract_unix_rcv_credential(sk, NULL, 0);
-		if (ret < 0)
-			return syserror("Failed to receive notification from parent process");
-
-		TRACE("Child process informed us that cgroup has been created");
-
-		target_fd0 = open_at(unified_fd, ".lxc/cgroup.procs", PROTECT_OPEN_W, PROTECT_LOOKUP_BENEATH, 0);
-		if (target_fd0 < 0)
-			return syserror("Failed to open \".lxc/cgroup.procs\"");
-
-		target_fd1 = open_at(unified_fd, "cgroup.procs", PROTECT_OPEN_W, PROTECT_LOOKUP_BENEATH, 0);
-		if (target_fd1 < 0)
-			return syserror("Failed to open \".lxc/cgroup.procs\"");
-
-		TRACE("Opened target cgroup file descriptors %d and %d", target_fd0, target_fd1);
-	}
-
-	pidstr_len = sprintf(pidstr, INT64_FMT, (int64_t)pid);
-
-	ret = lxc_write_nointr(target_fd0, pidstr, pidstr_len);
-	if (ret > 0 && (size_t)ret == pidstr_len)
-		return log_debug(0, "Moved process into target cgroup via fd %d", target_fd0);
-
-	ret = lxc_write_nointr(target_fd1, pidstr, pidstr_len);
-	if (ret > 0 && (size_t)ret == pidstr_len)
-		return log_debug(0, "Moved process into target cgroup via fd %d", target_fd1);
-
-	return syserror("Failed to move process into target cgroup via fd %d and %d", target_fd0, target_fd1);
-}
-
-struct userns_exec_unified_attach_data {
-	const struct lxc_conf *conf;
-	const char *lxcpath;
-	int unified_fd;
-	int sk_pair[2];
-	pid_t pid;
-	bool unprivileged;
-};
-
-static int cgroup_unified_attach_child_wrapper(void *data)
-{
-	struct userns_exec_unified_attach_data *args = data;
-
-	if (!args->conf || !args->lxcpath || args->unified_fd < 0 ||
-	    args->pid <= 0 || args->sk_pair[0] < 0 || args->sk_pair[1] < 0)
-		return ret_errno(EINVAL);
-
-	close_prot_errno_disarm(args->sk_pair[0]);
-	return cgroup_attach_create_leaf(args->conf, args->unified_fd,
-					 &args->sk_pair[1], args->unprivileged);
-}
-
-static int cgroup_unified_attach_parent_wrapper(void *data)
-{
-	struct userns_exec_unified_attach_data *args = data;
-
-	if (!args->conf || args->unified_fd < 0 || args->pid <= 0 ||
-	    args->sk_pair[0] < 0 || args->sk_pair[1] < 0)
-		return ret_errno(EINVAL);
-
-	close_prot_errno_disarm(args->sk_pair[1]);
-	return cgroup_attach_move_into_leaf(args->conf, args->lxcpath,
-					    args->unified_fd,
-					    &args->sk_pair[0], args->pid,
-					    args->unprivileged);
-}
-
-/* Technically, we're always at a delegation boundary here (This is especially
- * true when cgroup namespaces are available.). The reasoning is that in order
- * for us to have been able to start a container in the first place the root
- * cgroup must have been a leaf node. Now, either the container's init system
- * has populated the cgroup and kept it as a leaf node or it has created
- * subtrees. In the former case we will simply attach to the leaf node we
- * created when we started the container in the latter case we create our own
- * cgroup for the attaching process.
- */
-static int __cg_unified_attach(const struct hierarchy *h,
-			       const struct lxc_conf *conf, const char *name,
-			       const char *lxcpath, pid_t pid,
-			       const char *controller)
-{
-	__do_close int unified_fd = -EBADF;
-	__do_free char *path = NULL, *cgroup = NULL;
-	int ret;
-
-	if (!conf || !name || !lxcpath || pid <= 0)
-		return ret_errno(EINVAL);
-
-	ret = cgroup_attach(conf, name, lxcpath, pid);
-	if (ret == 0)
-		return log_trace(0, "Attached to unified cgroup via command handler");
-	TRACE("__cg_unified_attach: cgroup_attach returned %d", ret);
-	if (!ERRNO_IS_NOT_SUPPORTED(ret) && ret != -ENOCGROUP2)
-		return log_error_errno(ret, errno, "Failed to attach to unified cgroup");
-
-	/* Fall back to retrieving the path for the unified cgroup. */
-	cgroup = lxc_cmd_get_cgroup_path(name, lxcpath, controller);
-	/* not running */
-	if (!cgroup)
-		return 0;
-	TRACE("lxc_cmd_get_cgroup_path returned %s", cgroup);
-
-	path = make_cgroup_path(h, cgroup, NULL);
-
-	unified_fd = open(path, O_PATH | O_DIRECTORY | O_CLOEXEC);
-	if (unified_fd < 0)
-		return ret_errno(EBADF);
-
-	if (!list_empty(&conf->id_map)) {
-		struct userns_exec_unified_attach_data args = {
-			.conf		= conf,
-			.unified_fd	= unified_fd,
-			.pid		= pid,
-			.unprivileged	= am_guest_unpriv(),
-			.lxcpath	= lxcpath,
-		};
-
-		ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, args.sk_pair);
-		if (ret < 0)
-			return -errno;
-
-		ret = userns_exec_minimal(conf,
-					  cgroup_unified_attach_parent_wrapper,
-					  &args,
-					  cgroup_unified_attach_child_wrapper,
-					  &args);
-	} else {
-		ret = cgroup_attach_leaf(conf, unified_fd, pid);
-	}
-
-	return ret;
-}
-
-__cgfsng_ops static bool isulad_cgfsng_attach(struct cgroup_ops *ops,
-				       const struct lxc_conf *conf,
-				       const char *name, const char *lxcpath,
-				       pid_t pid)
-{
-	int len, ret;
-	char pidstr[INTTYPE_TO_STRLEN(pid_t)];
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-#ifdef HAVE_ISULAD
-	if (ops->no_controller) {
-		DEBUG("no controller found, isgnore isulad_cgfsng_attach");
-		return true;
-	}
-#endif
-
-	if (!ops->hierarchies)
-		return true;
-
-	len = snprintf(pidstr, sizeof(pidstr), "%d", pid);
-	if (len < 0 || (size_t)len >= sizeof(pidstr))
-		return false;
-
-	for (int i = 0; ops->hierarchies[i]; i++) {
-		__do_free char *fullpath = NULL, *path = NULL;
-		struct hierarchy *h = ops->hierarchies[i];
-
-		if (h->fs_type == CGROUP2_SUPER_MAGIC) {
-			ret = __cg_unified_attach(h, conf, name, lxcpath, pid,
-						  h->controllers[0]);
-			if (ret < 0)
-				return false;
-
-			continue;
-		}
-
-		path = lxc_cmd_get_cgroup_path(name, lxcpath, h->controllers[0]);
-		/* not running */
-		if (!path)
-			return false;
-
-		fullpath = build_full_cgpath_from_monitorpath(h, path, "cgroup.procs");
-		ret = lxc_write_to_file(fullpath, pidstr, len, false, 0666);
-		if (ret < 0)
-			return log_error_errno(false, errno, "Failed to attach %d to %s",
-					       (int)pid, fullpath);
-	}
-
-	return true;
-}
-
-__cgfsng_ops static int isulad_cgfsng_get(struct cgroup_ops *ops, const char *filename,
-                                   char *value, size_t len, const char *name,
-                                   const char *lxcpath)
-{
-	int ret = -1;
-	size_t controller_len;
-	char *controller, *p, *path;
-	struct hierarchy *h;
-
-	controller_len = strlen(filename);
-	controller = alloca(controller_len + 1);
-	(void)strlcpy(controller, filename, controller_len + 1);
-
-	p = strchr(controller, '.');
-	if (p)
-		*p = '\0';
-
-	const char *ori_path = ops->get_cgroup(ops, controller);
-	if (ori_path == NULL) {
-		ERROR("Failed to get cgroup path:%s", controller);
-		return -1;
-	}
-	path = safe_strdup(ori_path);
-
-	h = get_hierarchy(ops, controller);
-	if (h) {
-		char *fullpath;
-
-		fullpath = build_full_cgpath_from_monitorpath(h, path, filename);
-		ret = lxc_read_from_file(fullpath, value, len);
-		free(fullpath);
-	}
-	free(path);
-
-	return ret;
-}
-
-static int device_cgroup_parse_access(struct device_item *device, const char *val)
-{
-	for (int count = 0; count < 3; count++, val++) {
-		switch (*val) {
-		case 'r':
-			device->access[count] = *val;
-			break;
-		case 'w':
-			device->access[count] = *val;
-			break;
-		case 'm':
-			device->access[count] = *val;
-			break;
-		case '\n':
-		case '\0':
-			count = 3;
-			break;
-		default:
-			return ret_errno(EINVAL);
-		}
-	}
-
-	return 0;
-}
-
-static int device_cgroup_rule_parse(struct device_item *device, const char *key,
-				    const char *val)
-{
-	size_t count;
-	int ret;
-	char temp[50];
-
-	if (strequal("devices.allow", key))
-		device->allow = 1; /* allow the device */
-	else
-		device->allow = 0; /* deny the device */
-
-	if (strequal(val, "a")) {
-		/* global rule */
-		device->type = 'a';
-		device->major = -1;
-		device->minor = -1;
-		return 0;
-	}
-
-	switch (*val) {
-	case 'a':
-		__fallthrough;
-	case 'b':
-		__fallthrough;
-	case 'c':
-		device->type = *val;
-		break;
-	default:
-		return -1;
-	}
-
-	val++;
-	if (!isspace(*val))
-		return -1;
-	val++;
-	if (*val == '*') {
-		device->major = -1;
-		val++;
-	} else if (isdigit(*val)) {
-		memset(temp, 0, sizeof(temp));
-		for (count = 0; count < sizeof(temp) - 1; count++) {
-			temp[count] = *val;
-			val++;
-			if (!isdigit(*val))
-				break;
-		}
-		ret = lxc_safe_int(temp, &device->major);
-		if (ret)
-			return -1;
-	} else {
-		return -1;
-	}
-	if (*val != ':')
-		return -1;
-	val++;
-
-	/* read minor */
-	if (*val == '*') {
-		device->minor = -1;
-		val++;
-	} else if (isdigit(*val)) {
-		memset(temp, 0, sizeof(temp));
-		for (count = 0; count < sizeof(temp) - 1; count++) {
-			temp[count] = *val;
-			val++;
-			if (!isdigit(*val))
-				break;
-		}
-		ret = lxc_safe_int(temp, &device->minor);
-		if (ret)
-			return -1;
-	} else {
-		return -1;
-	}
-	if (!isspace(*val))
-		return -1;
-
-	return device_cgroup_parse_access(device, ++val);
-}
-
-__cgfsng_ops static int isulad_cgfsng_set(struct cgroup_ops *ops,
-                                   const char *filename, const char *value,
-                                   const char *name, const char *lxcpath)
-{
-	int ret = -1;
-	size_t controller_len;
-	char *controller, *p, *path;
-	struct hierarchy *h;
-
-	controller_len = strlen(filename);
-	controller = alloca(controller_len + 1);
-	(void)strlcpy(controller, filename, controller_len + 1);
-
-	p = strchr(controller, '.');
-	if (p)
-		*p = '\0';
-
-	const char *ori_path = ops->get_cgroup(ops, controller);
-	if (ori_path == NULL) {
-		ERROR("Failed to get cgroup path:%s", controller);
-		return -1;
-	}
-	path = safe_strdup(ori_path);
-
-	h = get_hierarchy(ops, controller);
-	if (h) {
-		char *fullpath;
-		fullpath = build_full_cgpath_from_monitorpath(h, path, filename);
-
-		if (strcmp(filename, "io.weight") == 0 || strcmp(filename, "io.bfq.weight") == 0) {
-			if (!file_exists(fullpath)) {
-				free(path);
-				free(fullpath);
-				return 0;
-			}
-		}
-
-		ret = lxc_write_to_file(fullpath, value, strlen(value), false, 0666);
-		free(fullpath);
-	}
-	free(path);
-
-	return ret;
-}
-
-/* take devices cgroup line
- *    /dev/foo rwx
- * and convert it to a valid
- *    type major:minor mode
- * line. Return <0 on error. Dest is a preallocated buffer long enough to hold
- * the output.
- */
-static int device_cgroup_rule_parse_devpath(struct device_item *device,
-					    const char *devpath)
-{
-	__do_free char *path = NULL;
-	char *mode = NULL;
-	int n_parts, ret;
-	char *p;
-	struct stat sb;
-
-	path = strdup(devpath);
-	if (!path)
-		return ret_errno(ENOMEM);
-
-	/*
-	 * Read path followed by mode. Ignore any trailing text.
-	 * A '    # comment' would be legal. Technically other text is not
-	 * legal, we could check for that if we cared to.
-	 */
-	for (n_parts = 1, p = path; *p; p++) {
-		if (*p != ' ')
-			continue;
-		*p = '\0';
-
-		if (n_parts != 1)
-			break;
-		p++;
-		n_parts++;
-
-		while (*p == ' ')
-			p++;
-
-		mode = p;
-
-		if (*p == '\0')
-			return ret_set_errno(-1, EINVAL);
-	}
-
-	if (device_cgroup_parse_access(device, mode) < 0)
-		return -1;
-
-	ret = stat(path, &sb);
-	if (ret < 0)
-		return ret_set_errno(-1, errno);
-
-	mode_t m = sb.st_mode & S_IFMT;
-	switch (m) {
-	case S_IFBLK:
-		device->type = 'b';
-		break;
-	case S_IFCHR:
-		device->type = 'c';
-		break;
-	default:
-		return log_error_errno(-1, EINVAL, "Unsupported device type %i for \"%s\"", m, path);
-	}
-
-	device->major = MAJOR(sb.st_rdev);
-	device->minor = MINOR(sb.st_rdev);
-	device->allow = 1;
-
-	return 0;
-}
-
-static int convert_devpath(const char *invalue, char *dest)
-{
-	struct device_item device = {0};
-	int ret;
-
-	ret = device_cgroup_rule_parse_devpath(&device, invalue);
-	if (ret < 0)
-		return -1;
-
-	ret = snprintf(dest, 50, "%c %d:%d %s", device.type, device.major,
-		       device.minor, device.access);
-	if (ret < 0 || ret >= 50)
-		return log_error_errno(-1, ENAMETOOLONG, "Error on configuration value \"%c %d:%d %s\" (max 50 chars)",
-				       device.type, device.major, device.minor, device.access);
-
-	return 0;
-}
-
-/* Called from setup_limits - here we have the container's cgroup_data because
- * we created the cgroups.
- */
-static int isulad_cg_legacy_get_data(struct cgroup_ops *ops, const char *filename,
-                              char *value, size_t len)
-{
-	char *fullpath = NULL;
-	char *p = NULL;
-	struct hierarchy *h = NULL;
-	int ret = 0;
-	char *controller = NULL;
-
-	len = strlen(filename);
-	if (SIZE_MAX - 1 < len) {
-		errno = EINVAL;
-		return -1;
-	}
-	controller = calloc(1, len + 1);
-	if (controller == NULL) {
-		errno = ENOMEM;
-		return -1;
-	}
-	(void)strlcpy(controller, filename, len + 1);
-
-	p = strchr(controller, '.');
-	if (p)
-		*p = '\0';
-
-
-	h = get_hierarchy(ops, controller);
-	if (!h) {
-		ERROR("Failed to setup limits for the \"%s\" controller. "
-		      "The controller seems to be unused by \"cgfsng\" cgroup "
-		      "driver or not enabled on the cgroup hierarchy",
-		      controller);
-		errno = ENOENT;
-		free(controller);
-		return -ENOENT;
-	}
-
-	fullpath = must_make_path(h->path_con, filename, NULL);
-	ret = lxc_read_from_file(fullpath, value, len);
-	free(fullpath);
-	free(controller);
-	return ret;
-}
-
-static int isulad_cg_legacy_set_data(struct cgroup_ops *ops, const char *filename,
-                              const char *value)
-{
-	size_t len;
-	char *fullpath, *p;
-	/* "b|c <2^64-1>:<2^64-1> r|w|m" = 47 chars max */
-	char converted_value[50];
-	struct hierarchy *h;
-	int ret = 0;
-	char *controller = NULL;
-	int retry_count = 0;
-	int max_retry = 10;
-	char *container_cgroup = ops->container_cgroup;
-
-	len = strlen(filename);
-	controller = alloca(len + 1);
-	(void)strlcpy(controller, filename, len + 1);
-
-	p = strchr(controller, '.');
-	if (p)
-		*p = '\0';
-
-	if (strcmp("devices.allow", filename) == 0 && value[0] == '/') {
-		ret = convert_devpath(value, converted_value);
-		if (ret < 0)
-			return ret;
-		value = converted_value;
-	}
-
-	h = get_hierarchy(ops, controller);
-	if (!h) {
-		ERROR("Failed to setup limits for the \"%s\" controller. "
-		      "The controller seems to be unused by \"cgfsng\" cgroup "
-		      "driver or not enabled on the cgroup hierarchy",
-		      controller);
-		errno = ENOENT;
-		return -ENOENT;
-	}
-
-	fullpath = must_make_path(h->path_con, filename, NULL);
-
-retry:
-	ret = lxc_write_to_file(fullpath, value, strlen(value), false, 0666);
-	if (ret != 0) {
-		if (retry_count < max_retry) {
-			SYSERROR("setting cgroup config for ready process caused \"failed to write %s to %s\".", value, fullpath);
-			(void)isulad_cg_legacy_handle_cpuset_hierarchy(h, container_cgroup);
-			(void)isulad_mkdir_eexist_on_last(h->path_con, 0755);
-			usleep(100 * 1000); /* 100 millisecond */
-			retry_count++;
-			goto retry;
-		}
-		lxc_write_error_message(ops->errfd,
-		                        "%s:%d: setting cgroup config for ready process caused failed to write %s to %s: %s",
-		                        __FILE__, __LINE__, value, fullpath, strerror(errno));
-	}
-	free(fullpath);
-	return ret;
-}
-
-/*
- * Return the list of cgroup_settings sorted according to the following rules
- * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes
- */
-static void sort_cgroup_settings(struct lxc_conf *conf)
-{
-	LIST_HEAD(memsw_list);
-	struct lxc_cgroup *cgroup, *ncgroup;
-
-	/* Iterate over the cgroup settings and copy them to the output list. */
-	list_for_each_entry_safe(cgroup, ncgroup, &conf->cgroup, head) {
-		if (!strequal(cgroup->subsystem, "memory.memsw.limit_in_bytes"))
-			continue;
-
-		/* Move the memsw entry from the cgroup settings list. */
-		list_move_tail(&cgroup->head, &memsw_list);
-	}
-
-	/*
-	 * Append all the memsw entries to the end of the cgroup settings list
-	 * to make sure they are applied after all memory limit settings.
-	 */
-	list_splice_tail(&memsw_list, &conf->cgroup);
-
-}
-
-__cgfsng_ops static bool isulad_cgfsng_setup_limits_legacy(struct cgroup_ops *ops,
-						    struct lxc_conf *conf,
-						    bool do_devices)
-{
-	struct list_head *cgroup_settings;
-	struct lxc_cgroup *cgroup;
-	char value[21 + 1] = { 0 };
-	long long int readvalue, setvalue;
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-	if (!conf)
-		return ret_set_errno(false, EINVAL);
-
-	cgroup_settings = &conf->cgroup;
-	if (list_empty(cgroup_settings))
-		return true;
-
-	if (!ops->hierarchies)
-		return ret_set_errno(false, EINVAL);
-
-	if (pure_unified_layout(ops))
-		return true;
-
-	sort_cgroup_settings(conf);
-	list_for_each_entry(cgroup, cgroup_settings, head) {
-		if (do_devices == strnequal("devices", cgroup->subsystem, 7)) {
-			const char *cgvalue = cgroup->value;
-			if (strcmp(cgroup->subsystem, "files.limit") == 0) {
-				if (lxc_safe_long_long(cgvalue, &setvalue) != 0) {
-					SYSERROR("Invalid integer value %s", cgvalue);
-					return false;
-				}
-				if (setvalue <= 0) {
-					cgvalue = "max";
-				}
-			}
-			if (isulad_cg_legacy_set_data(ops, cgroup->subsystem, cgvalue)) {
-				if (do_devices && (errno == EACCES || errno == EPERM)) {
-					SYSWARN("Failed to set \"%s\" to \"%s\"", cgroup->subsystem, cgvalue);
-					continue;
-				}
-				SYSERROR("Failed to set \"%s\" to \"%s\"", cgroup->subsystem, cgvalue);
-				return false;
-			}
-			DEBUG("Set controller \"%s\" set to \"%s\"", cgroup->subsystem, cgvalue);
-		}
-
-		// isulad: check cpu shares
-		if (strcmp(cgroup->subsystem, "cpu.shares") == 0) {
-			if (isulad_cg_legacy_get_data(ops, cgroup->subsystem, value, sizeof(value) - 1) < 0) {
-				SYSERROR("Error get %s", cgroup->subsystem);
-				return false;
-			}
-			trim(value);
-			if (lxc_safe_long_long(cgroup->value, &setvalue) != 0) {
-				SYSERROR("Invalid value %s", cgroup->value);
-				return false;
-			}
-			if (lxc_safe_long_long(value, &readvalue) != 0) {
-				SYSERROR("Invalid value %s", value);
-				return false;
-			}
-			if (setvalue > readvalue) {
-				ERROR("The maximum allowed cpu-shares is %s", value);
-				lxc_write_error_message(ops->errfd,
-				                        "%s:%d: setting cgroup config for ready process caused \"The maximum allowed cpu-shares is %s\".",
-				                        __FILE__, __LINE__, value);
-				return false;
-			} else if (setvalue < readvalue) {
-				ERROR("The minimum allowed cpu-shares is %s", value);
-				lxc_write_error_message(ops->errfd,
-				                        "%s:%d: setting cgroup config for ready process caused \"The minimum allowed cpu-shares is %s\".",
-				                        __FILE__, __LINE__, value);
-				return false;
-			}
-		}
-	}
-
-	INFO("Limits for the legacy cgroup hierarchies have been setup");
-	return true;
-}
-
-/*
- * Some of the parsing logic comes from the original cgroup device v1
- * implementation in the kernel.
- */
-static int bpf_device_cgroup_prepare(struct cgroup_ops *ops,
-				     struct lxc_conf *conf, const char *key,
-				     const char *val)
-{
-	struct device_item device_item = {};
-	int ret;
-
-	if (strequal("devices.allow", key) && abspath(val))
-		ret = device_cgroup_rule_parse_devpath(&device_item, val);
-	else
-		ret = device_cgroup_rule_parse(&device_item, key, val);
-	if (ret < 0)
-		return syserror_set(EINVAL, "Failed to parse device rule %s=%s", key, val);
-
-	/*
-	 * Note that bpf_list_add_device() returns 1 if it altered the device
-	 * list and 0 if it didn't; both return values indicate success.
-	 * Only a negative return value indicates an error.
-	 */
-	ret = bpf_list_add_device(&conf->bpf_devices, &device_item);
-	if (ret < 0)
-		return -1;
-
-	return 0;
-}
-__cgfsng_ops static bool isulad_cgfsng_setup_limits(struct cgroup_ops *ops,
-					     struct lxc_handler *handler)
-{
-	__do_free char *path = NULL;
-	struct list_head *cgroup_settings;
-	struct hierarchy *h;
-	struct lxc_conf *conf;
-	struct lxc_cgroup *cg;
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-	if (!ops->hierarchies)
-		return true;
-
-	if (!ops->container_cgroup)
-		return ret_set_errno(false, EINVAL);
-
-	if (!handler || !handler->conf)
-		return ret_set_errno(false, EINVAL);
-	conf = handler->conf;
-
-	if (list_empty(&conf->cgroup2))
-		return true;
-	cgroup_settings = &conf->cgroup2;
-
-	if (!pure_unified_layout(ops))
-		return true;
-
-	if (!ops->unified)
-		return false;
-	h = ops->unified;
-
-	list_for_each_entry(cg, cgroup_settings, head) {
-		int ret;
-
-		if (strncmp("devices", cg->subsystem, 7) == 0) {
-			ret = bpf_device_cgroup_prepare(ops, conf, cg->subsystem,
-							cg->value);
-		} else if (strcmp(cg->subsystem, "files.limit") == 0) {
-			long long int setvalue = 0;
-			const char *cgvalue = cg->value;
-
-			if (lxc_safe_long_long(cgvalue, &setvalue) != 0)
-				return log_error(false, "Invalid integer value %s", cgvalue);
-
-			if (setvalue <= 0)
-				cgvalue = "max";
-
-			ret = lxc_write_openat(h->path_con,
-					       cg->subsystem, cgvalue,
-					       strlen(cgvalue));
-			if (ret < 0)
-				return log_error_errno(false, errno, "Failed to set \"%s\" to \"%s\"",
-						       cg->subsystem, cgvalue);
-		} else {
-			if (strcmp(cg->subsystem, "io.weight") == 0 || strcmp(cg->subsystem, "io.bfq.weight") == 0) {
-				path = must_make_path(h->path_con, cg->subsystem, NULL);
-				if (!file_exists(path)) {
-					continue;
-				}
-			}
-			ret = lxc_write_openat(h->path_con,
-					       cg->subsystem, cg->value,
-					       strlen(cg->value));
-			if (ret < 0)
-				return log_error_errno(false, errno, "Failed to set \"%s\" to \"%s\"",
-						       cg->subsystem, cg->value);
-		}
-		TRACE("Set \"%s\" to \"%s\"", cg->subsystem, cg->value);
-	}
-
-	return log_info(true, "Limits for the unified cgroup hierarchy have been setup");
-}
-
-__cgfsng_ops bool isulad_cgfsng_devices_activate(struct cgroup_ops *ops,
-					  struct lxc_handler *handler)
-{
-#ifdef HAVE_STRUCT_BPF_CGROUP_DEV_CTX
-	__do_bpf_program_free struct bpf_program *devices = NULL;
-	int ret;
-	struct lxc_conf *conf;
-	struct hierarchy *unified;
-	struct lxc_list *it;
-	struct bpf_program *devices_old;
-
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-	if (!ops->hierarchies)
-		return true;
-
-	if (!ops->container_cgroup)
-		return ret_set_errno(false, EEXIST);
-
-	if (!handler || !handler->conf)
-		return ret_set_errno(false, EINVAL);
-	conf = handler->conf;
-
-	unified = ops->unified;
-	if (!unified || !unified->bpf_device_controller ||
-	    !unified->path_con || lxc_list_empty(&conf->devices))
-		return true;
-
-	devices = bpf_program_new(BPF_PROG_TYPE_CGROUP_DEVICE);
-	if (!devices)
-		return log_error_errno(false, ENOMEM, "Failed to create new bpf program");
-
-	ret = bpf_program_init(devices);
-	if (ret)
-		return log_error_errno(false, ENOMEM, "Failed to initialize bpf program");
-
-	lxc_list_for_each(it, &conf->devices) {
-		struct device_item *cur = it->elem;
-
-		ret = bpf_program_append_device(devices, cur);
-		if (ret)
-			return log_error_errno(false, ENOMEM, "Failed to add new rule to bpf device program: type %c, major %d, minor %d, access %s, allow %d, global_rule %d",
-					       cur->type,
-					       cur->major,
-					       cur->minor,
-					       cur->access,
-					       cur->allow,
-					       cur->global_rule);
-		TRACE("Added rule to bpf device program: type %c, major %d, minor %d, access %s, allow %d, global_rule %d",
-		      cur->type,
-		      cur->major,
-		      cur->minor,
-		      cur->access,
-		      cur->allow,
-		      cur->global_rule);
-	}
-
-	ret = bpf_program_finalize(devices);
-	if (ret)
-		return log_error_errno(false, ENOMEM, "Failed to finalize bpf program");
-
-	ret = bpf_program_cgroup_attach(devices, BPF_CGROUP_DEVICE,
-					unified->path_con,
-					BPF_F_ALLOW_MULTI);
-	if (ret)
-		return log_error_errno(false, ENOMEM, "Failed to attach bpf program");
-
-	/* Replace old bpf program. */
-	devices_old = move_ptr(conf->cgroup2_devices);
-	conf->cgroup2_devices = move_ptr(devices);
-	devices = move_ptr(devices_old);
-#endif
-	return true;
-}
-
-bool __cgfsng_delegate_controllers(struct cgroup_ops *ops, const char *cgroup)
-{
-	__do_free char *add_controllers = NULL, *base_path = NULL;
-	__do_free_string_list char **parts = NULL;
-	struct hierarchy *unified = ops->unified;
-	ssize_t parts_len;
-	char **it;
-	size_t full_len = 0;
-
-	if (!ops->hierarchies || !pure_unified_layout(ops) ||
-	    !unified->controllers[0])
-		return true;
-
-	/* For now we simply enable all controllers that we have detected by
-	 * creating a string like "+memory +pids +cpu +io".
-	 * TODO: In the near future we might want to support "-<controller>"
-	 * etc. but whether supporting semantics like this make sense will need
-	 * some thinking.
-	 */
-	for (it = unified->controllers; it && *it; it++) {
-		full_len += strlen(*it) + 2;
-		add_controllers = must_realloc(add_controllers, full_len + 1);
-
-		if (unified->controllers[0] == *it)
-			add_controllers[0] = '\0';
-
-		(void)strlcat(add_controllers, "+", full_len + 1);
-		(void)strlcat(add_controllers, *it, full_len + 1);
-
-		if (*(it + 1))
-			(void)strlcat(add_controllers, " ", full_len + 1);
-	}
-
-	parts = lxc_string_split(cgroup, '/');
-	if (!parts)
-		return false;
-
-	parts_len = lxc_array_len((void **)parts);
-	if (parts_len > 0)
-		parts_len--;
-
-	base_path = must_make_path(unified->at_mnt, unified->at_base, NULL);
-	for (ssize_t i = -1; i < parts_len; i++) {
-		int ret;
-		__do_free char *target = NULL;
-
-		if (i >= 0)
-			base_path = must_append_path(base_path, parts[i], NULL);
-		target = must_make_path(base_path, "cgroup.subtree_control", NULL);
-		ret = lxc_writeat(-1, target, add_controllers, full_len);
-		if (ret < 0)
-			return log_error_errno(false, errno, "Could not enable \"%s\" controllers in the unified cgroup \"%s\"",
-					       add_controllers, target);
-		TRACE("Enable \"%s\" controllers in the unified cgroup \"%s\"", add_controllers, target);
-	}
-
-	return true;
-}
-
-__cgfsng_ops bool isulad_cgfsng_monitor_delegate_controllers(struct cgroup_ops *ops)
-{
-	return true;
-}
-
-__cgfsng_ops bool isulad_cgfsng_payload_delegate_controllers(struct cgroup_ops *ops)
-{
-	if (!ops)
-		return ret_set_errno(false, ENOENT);
-
-#ifdef HAVE_ISULAD
-	if (ops->no_controller) {
-		DEBUG("no controller found, isgnore isulad_cgfsng_payload_delegate_controllers");
-		return true;
-	}
-#endif
-
-	return __cgfsng_delegate_controllers(ops, ops->container_cgroup);
-}
-
-static inline bool unified_cgroup(const char *line)
-{
-	return *line == '0';
-}
-
-static inline char *current_unified_cgroup(bool relative, char *line)
-{
-	char *current_cgroup;
-
-	line += STRLITERALLEN("0::");
-
-	if (!abspath(line))
-		return ERR_PTR(-EINVAL);
-
-	/* remove init.scope */
-	if (!relative)
-		line = prune_init_scope(line);
-
-	/* create a relative path */
-	line = deabs(line);
-
-	current_cgroup = strdup(line);
-	if (!current_cgroup)
-		return ERR_PTR(-ENOMEM);
-
-	return current_cgroup;
-}
-
-static inline const char *unprefix(const char *controllers)
-{
-	if (strnequal(controllers, "name=", STRLITERALLEN("name=")))
-		return controllers + STRLITERALLEN("name=");
-	return controllers;
-}
-
-static int __list_cgroup_delegate(char ***delegate)
-{
-	__do_free char **list = NULL;
-	__do_free char *buf = NULL;
-	char *standard[] = {
-		"cgroup.procs",
-		"cgroup.threads",
-		"cgroup.subtree_control",
-		"memory.oom.group",
-		NULL,
-	};
-	char *token;
-	int ret;
-
-	buf = read_file_at(-EBADF, "/sys/kernel/cgroup/delegate", PROTECT_OPEN, 0);
-	if (!buf) {
-		for (char **p = standard; p && *p; p++) {
-			ret = list_add_string(&list, *p);
-			if (ret < 0)
-				return ret;
-		}
-
-		*delegate = move_ptr(list);
-		return syswarn_ret(0, "Failed to read /sys/kernel/cgroup/delegate");
-	}
-
-	lxc_iterate_parts(token, buf, " \t\n") {
-		/*
-		 * We always need to chown this for both cgroup and
-		 * cgroup2.
-		 */
-		if (strequal(token, "cgroup.procs"))
-			continue;
-
-		ret = list_add_string(&list, token);
-		if (ret < 0)
-			return ret;
-	}
-
-	*delegate = move_ptr(list);
-	return 0;
-}
-
-static bool unified_hierarchy_delegated(int dfd_base, char ***ret_files)
-{
-	__do_free_string_list char **list = NULL;
-	int ret;
-
-	ret = __list_cgroup_delegate(&list);
-	if (ret < 0)
-		return syserror_ret(ret, "Failed to determine unified cgroup delegation requirements");
-
-	for (char *const *s = list; s && *s; s++) {
-		if (!faccessat(dfd_base, *s, W_OK, 0) || errno == ENOENT)
-			continue;
-
-		return sysinfo_ret(false, "The %s file is not writable, skipping unified hierarchy", *s);
-	}
-
-	*ret_files = move_ptr(list);
-	return true;
-}
-
-static bool legacy_hierarchy_delegated(int dfd_base)
-{
-	int ret;
-
-	ret = faccessat(dfd_base, ".", W_OK, 0);
-	if (ret < 0 && errno != ENOENT)
-		return sysinfo_ret(false, "Legacy hierarchy not writable, skipping");
-
-	return true;
-}
-
-/**
- * systemd guarantees that the order of co-mounted controllers is stable. On
- * some systems the order of the controllers might be reversed though.
- *
- * For example, this is how the order is mismatched on CentOS 7:
- *
- *      [root@localhost ~]# cat /proc/self/cgroup
- *      11:perf_event:/
- *      10:pids:/
- *      9:freezer:/
- * >>>> 8:cpuacct,cpu:/
- *      7:memory:/
- *      6:blkio:/
- *      5:devices:/
- *      4:hugetlb:/
- * >>>> 3:net_prio,net_cls:/
- *      2:cpuset:/
- *      1:name=systemd:/user.slice/user-0.slice/session-c1.scope
- *
- * whereas the mountpoint:
- *
- *      | |-/sys/fs/cgroup                    tmpfs         tmpfs      ro,nosuid,nodev,noexec,mode=755
- *      | | |-/sys/fs/cgroup/systemd          cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd
- *      | | |-/sys/fs/cgroup/cpuset           cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,cpuset
- * >>>> | | |-/sys/fs/cgroup/net_cls,net_prio cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,net_prio,net_cls
- *      | | |-/sys/fs/cgroup/hugetlb          cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,hugetlb
- *      | | |-/sys/fs/cgroup/devices          cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,devices
- *      | | |-/sys/fs/cgroup/blkio            cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,blkio
- *      | | |-/sys/fs/cgroup/memory           cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,memory
- * >>>> | | |-/sys/fs/cgroup/cpu,cpuacct      cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,cpuacct,cpu
- *      | | |-/sys/fs/cgroup/freezer          cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,freezer
- *      | | |-/sys/fs/cgroup/pids             cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,pids
- *      | | `-/sys/fs/cgroup/perf_event       cgroup        cgroup     rw,nosuid,nodev,noexec,relatime,perf_event
- *
- * Ensure that we always use the systemd-guaranteed stable order when checking
- * for the mountpoint.
- */
-#if HAVE_COMPILER_ATTR_NONNULL
-__attribute__((nonnull))
-#endif
-#if HAVE_COMPILER_ATTR_RETURNS_NONNULL
-__attribute__((returns_nonnull))
-#endif
-static const char *stable_order(const char *controllers)
-{
-	if (strequal(controllers, "cpuacct,cpu"))
-		return "cpu,cpuacct";
-
-	if (strequal(controllers, "net_prio,net_cls"))
-		return "net_cls,net_prio";
-
-	return unprefix(controllers);
-}
-
-#define CGFSNG_LAYOUT_LEGACY	BIT(0)
-#define CGFSNG_LAYOUT_UNIFIED	BIT(1)
-
-static int __initialize_cgroups(struct cgroup_ops *ops, bool relative,
-				bool unprivileged, struct lxc_conf *conf)
-{
-	__do_free char *cgroup_info = NULL;
-	unsigned int layout_mask = 0;
-	int ret;
-	char *it;
-
-	ret = unpriv_systemd_create_scope(ops, conf);
-	if (ret < 0)
-		return ret_set_errno(false, ret);
-	else if (ret == 0)
-		TRACE("Entered an unpriv systemd scope");
-
-	/*
-	 * Root spawned containers escape the current cgroup, so use init's
-	 * cgroups as our base in that case.
-	 */
-	if (!relative && (geteuid() == 0))
-		cgroup_info = read_file_at(-EBADF, "/proc/1/cgroup", PROTECT_OPEN, 0);
-	else
-		cgroup_info = read_file_at(-EBADF, "/proc/self/cgroup", PROTECT_OPEN, 0);
-	if (!cgroup_info)
-		return ret_errno(ENOMEM);
-
-	lxc_iterate_parts(it, cgroup_info, "\n") {
-		__do_close int dfd_base = -EBADF, dfd_mnt = -EBADF;
-		__do_free char *controllers = NULL, *current_cgroup = NULL;
-		__do_free_string_list char **controller_list = NULL,
-					   **delegate = NULL;
-		char *line;
-		int dfd, type;
-
-		/* Handle the unified cgroup hierarchy. */
-		line = it;
-		if (unified_cgroup(line)) {
-			char *unified_mnt;
-
-			type = UNIFIED_HIERARCHY;
-			layout_mask |= CGFSNG_LAYOUT_UNIFIED;
-
-			if (conf->cgroup_meta.systemd_scope)
-				current_cgroup = cgroup_relpath(conf->cgroup_meta.systemd_scope);
-			if (IS_ERR_OR_NULL(current_cgroup))
-				current_cgroup = current_unified_cgroup(relative, line);
-			if (IS_ERR(current_cgroup))
-				return PTR_ERR(current_cgroup);
-
-			if (unified_cgroup_fd(ops->dfd_mnt)) {
-				dfd_mnt = dup_cloexec(ops->dfd_mnt);
-				unified_mnt = "";
-			} else {
-				dfd_mnt = open_at(ops->dfd_mnt,
-						  "unified",
-						  PROTECT_OPATH_DIRECTORY,
-						  PROTECT_LOOKUP_ABSOLUTE_XDEV, 0);
-				unified_mnt = "unified";
-			}
-			if (dfd_mnt < 0) {
-				if (errno != ENOENT)
-					return syserror("Failed to open %d/unified", ops->dfd_mnt);
-
-				SYSTRACE("Unified cgroup not mounted");
-				continue;
-			}
-
-			if (!fhas_fs_type(dfd_mnt, CGROUP2_SUPER_MAGIC)) {
-				SYSTRACE("Opened file descriptor %d is not a cgroup2 mountpoint", dfd_mnt);
-				continue;
-			}
-
-			dfd = dfd_mnt;
-
-			if (!is_empty_string(current_cgroup)) {
-				dfd_base = open_at(dfd_mnt, current_cgroup,
-						   PROTECT_OPATH_DIRECTORY,
-						   PROTECT_LOOKUP_BENEATH_XDEV, 0);
-				if (dfd_base < 0) {
-					if (errno != ENOENT)
-						return syserror("Failed to open %d/%s",
-								dfd_mnt, current_cgroup);
-
-					SYSTRACE("Current cgroup %d/%s does not exist (funky cgroup layout?)",
-						 dfd_mnt, current_cgroup);
-					continue;
-				}
-				dfd = dfd_base;
-			}
-
-			if (!unified_hierarchy_delegated(dfd, &delegate))
-				continue;
-
-			controller_list = unified_controllers(dfd, "cgroup.controllers");
-			if (!controller_list) {
-				TRACE("No controllers are enabled for delegation in the unified hierarchy");
-				controller_list = list_new();
-				if (!controller_list)
-					return syserror_set(-ENOMEM, "Failed to create empty controller list");
-			}
-
-			controllers = strdup(unified_mnt);
-			if (!controllers)
-				return ret_errno(ENOMEM);
-		} else {
-			char *__controllers, *__current_cgroup;
-
-			type = LEGACY_HIERARCHY;
-			layout_mask |= CGFSNG_LAYOUT_LEGACY;
-
-			__controllers = strchr(line, ':');
-			if (!__controllers)
-				return ret_errno(EINVAL);
-			__controllers++;
-
-			__current_cgroup = strchr(__controllers, ':');
-			if (!__current_cgroup)
-				return ret_errno(EINVAL);
-			*__current_cgroup = '\0';
-			__current_cgroup++;
-
-			controllers = strdup(stable_order(__controllers));
-			if (!controllers)
-				return ret_errno(ENOMEM);
-
-			dfd_mnt = open_at(ops->dfd_mnt,
-					  controllers,
-					  PROTECT_OPATH_DIRECTORY,
-					  PROTECT_LOOKUP_ABSOLUTE_XDEV, 0);
-			if (dfd_mnt < 0) {
-				if (errno != ENOENT)
-					return syserror("Failed to open %d/%s",
-							ops->dfd_mnt, controllers);
-
-				SYSTRACE("%s not mounted", controllers);
-				continue;
-			}
-
-			if (!fhas_fs_type(dfd_mnt, CGROUP_SUPER_MAGIC)) {
-				SYSTRACE("Opened file descriptor %d is not a cgroup mountpoint", dfd_mnt);
-				continue;
-			}
-
-			dfd = dfd_mnt;
-
-			if (!abspath(__current_cgroup))
-				return ret_errno(EINVAL);
-
-			/* remove init.scope */
-			if (!relative)
-				__current_cgroup = prune_init_scope(__current_cgroup);
-
-			/* create a relative path */
-			__current_cgroup = deabs(__current_cgroup);
-
-			current_cgroup = strdup(__current_cgroup);
-			if (!current_cgroup)
-				return ret_errno(ENOMEM);
-
-			if (!is_empty_string(current_cgroup)) {
-				dfd_base = open_at(dfd_mnt, current_cgroup,
-						   PROTECT_OPATH_DIRECTORY,
-						   PROTECT_LOOKUP_BENEATH_XDEV, 0);
-				if (dfd_base < 0) {
-					if (errno != ENOENT)
-						return syserror("Failed to open %d/%s",
-								dfd_mnt, current_cgroup);
-
-					SYSTRACE("Current cgroup %d/%s does not exist (funky cgroup layout?)",
-						 dfd_mnt, current_cgroup);
-					continue;
-				}
-				dfd = dfd_base;
-			}
-
-			if (!legacy_hierarchy_delegated(dfd))
-				continue;
-
-			/*
-			 * We intentionally pass __current_cgroup here and not
-			 * controllers because we would otherwise chop the
-			 * mountpoint.
-			 */
-			controller_list = list_add_controllers(__controllers);
-			if (!controller_list)
-				return syserror_set(-ENOMEM, "Failed to create controller list from %s", __controllers);
-
-			if (skip_hierarchy(ops, controller_list))
-				continue;
-
-			ops->cgroup_layout = CGROUP_LAYOUT_LEGACY;
-		}
-
-		ret = cgroup_hierarchy_add(ops, dfd_mnt, controllers, dfd,
-					   current_cgroup, controller_list, type);
-		if (ret < 0)
-			return syserror_ret(ret, "Failed to add %s hierarchy", controllers);
-
-		/* Transfer ownership. */
-		move_fd(dfd_mnt);
-		move_fd(dfd_base);
-		move_ptr(current_cgroup);
-		move_ptr(controllers);
-		move_ptr(controller_list);
-		if (type == UNIFIED_HIERARCHY)
-			ops->unified->delegate = move_ptr(delegate);
-	}
-
-	/* determine cgroup layout */
-	if (ops->unified) {
-		if (ops->cgroup_layout == CGROUP_LAYOUT_LEGACY) {
-			ops->cgroup_layout = CGROUP_LAYOUT_HYBRID;
-		} else {
-			if (bpf_devices_cgroup_supported())
-				ops->unified->utilities |= DEVICES_CONTROLLER;
-			ops->cgroup_layout = CGROUP_LAYOUT_UNIFIED;
-		}
-	}
-
-	/*
-	 * If we still don't know the cgroup layout at this point it means we
-	 * have not found any writable cgroup hierarchies. Infer the layout
-	 * from the layout bitmask we created when parsing the cgroups.
-	 *
-	 * Keep the ordering in the switch otherwise the bistmask-based
-	 * matching won't work.
-	 */
-	if (ops->cgroup_layout == CGROUP_LAYOUT_UNKNOWN) {
-		switch (layout_mask) {
-		case (CGFSNG_LAYOUT_LEGACY | CGFSNG_LAYOUT_UNIFIED):
-			ops->cgroup_layout = CGROUP_LAYOUT_HYBRID;
-			break;
-		case CGFSNG_LAYOUT_LEGACY:
-			ops->cgroup_layout = CGROUP_LAYOUT_LEGACY;
-			break;
-		case CGFSNG_LAYOUT_UNIFIED:
-			ops->cgroup_layout = CGROUP_LAYOUT_UNIFIED;
-			break;
-		}
-	}
-
-	if (!controllers_available(ops))
-		return syserror_set(-ENOENT, "One or more requested controllers unavailable or not delegated");
-
-	return 0;
-}
-
-static int isulad_initialize_cgroups(struct cgroup_ops *ops, struct lxc_conf *conf)
-{
-	__do_close int dfd = -EBADF;
-	int ret;
-	const char *controllers_use;
-
-	if (ops->dfd_mnt >= 0)
-		return ret_errno(EBUSY);
-
-	/*
-	 * I don't see the need for allowing symlinks here. If users want to
-	 * have their hierarchy available in different locations I strongly
-	 * suggest bind-mounts.
-	 */
-	dfd = open_at(-EBADF, DEFAULT_CGROUP_MOUNTPOINT,
-			PROTECT_OPATH_DIRECTORY, PROTECT_LOOKUP_ABSOLUTE_XDEV, 0);
-	if (dfd < 0)
-		return syserror("Failed to open " DEFAULT_CGROUP_MOUNTPOINT);
-
-	controllers_use = lxc_global_config_value("lxc.cgroup.use");
-	if (controllers_use) {
-		__do_free char *dup = NULL;
-		char *it;
-
-		dup = strdup(controllers_use);
-		if (!dup)
-			return -errno;
-
-		lxc_iterate_parts(it, dup, ",") {
-			ret = list_add_string(&ops->cgroup_use, it);
-			if (ret < 0)
-				return ret;
-		}
-	}
-
-	/*
-	 * Keep dfd referenced by the cleanup function and actually move the fd
-	 * once we know the initialization succeeded. So if we fail we clean up
-	 * the dfd.
-	 */
-	ops->dfd_mnt = dfd;
-
-	ret = __initialize_cgroups(ops, conf->cgroup_meta.relative, !list_empty(&conf->id_map), conf);
-	if (ret < 0)
-		return syserror_ret(ret, "Failed to initialize cgroups");
-
-	/* Transfer ownership to cgroup_ops. */
-	move_fd(dfd);
-	return 0;
-}
-
-__cgfsng_ops static int isulad_cgfsng_data_init(struct cgroup_ops *ops, struct lxc_conf *conf)
-{
-	const char *cgroup_pattern;
-#ifdef HAVE_ISULAD
-	const char *cgroup_tree;
-	__do_free char *container_cgroup = NULL, *__cgroup_tree = NULL;
-	size_t len;
-#endif
-
-	if (!ops)
-		return ret_set_errno(-1, ENOENT);
-
-	/* copy system-wide cgroup information */
-	cgroup_pattern = lxc_global_config_value("lxc.cgroup.pattern");
-	if (cgroup_pattern && !strequal(cgroup_pattern, "")) {
-		ops->cgroup_pattern = strdup(cgroup_pattern);
-		if (!ops->cgroup_pattern)
-			return ret_errno(ENOMEM);
-	}
-
-#ifdef HAVE_ISULAD
-	if (conf->cgroup_meta.dir) {
-		cgroup_tree = conf->cgroup_meta.dir;
-		container_cgroup = must_concat(&len, cgroup_tree, "/", conf->name, NULL);
-	} else if (ops->cgroup_pattern) {
-		__cgroup_tree = lxc_string_replace("%n", conf->name, ops->cgroup_pattern);
-		if (!__cgroup_tree)
-			return ret_set_errno(-1, ENOMEM);
-
-		cgroup_tree = __cgroup_tree;
-		container_cgroup = must_concat(&len, cgroup_tree, NULL);
-	} else {
-		cgroup_tree = NULL;
-		container_cgroup = must_concat(&len, conf->name, NULL);
-	}
-	if (!container_cgroup)
-		return ret_set_errno(-1, ENOMEM);
-
-	ops->container_cgroup = move_ptr(container_cgroup);
-#endif
-
-	return 0;
-}
-
-struct cgroup_ops *cgroup_ops_init(struct lxc_conf *conf)
-{
-	__cleanup_cgroup_ops struct cgroup_ops *cgfsng_ops = NULL;
-
-	cgfsng_ops = zalloc(sizeof(struct cgroup_ops));
-	if (!cgfsng_ops)
-		return ret_set_errno(NULL, ENOMEM);
-
-	cgfsng_ops->cgroup_layout	= CGROUP_LAYOUT_UNKNOWN;
-	cgfsng_ops->dfd_mnt		= -EBADF;
-
-	if (isulad_initialize_cgroups(cgfsng_ops, conf))
-		return NULL;
-
-	cgfsng_ops->data_init = isulad_cgfsng_data_init;
-
-	cgfsng_ops->errfd = conf ? conf->errpipe[1] : -1;
-	cgfsng_ops->get_cgroup_full_path = isulad_cgfsng_get_cgroup_full_path;
-	cgfsng_ops->payload_destroy = isulad_cgfsng_payload_destroy;
-	cgfsng_ops->monitor_destroy = isulad_cgfsng_monitor_destroy;
-	cgfsng_ops->monitor_create = isulad_cgfsng_monitor_create;
-	cgfsng_ops->monitor_enter = isulad_cgfsng_monitor_enter;
-	cgfsng_ops->monitor_delegate_controllers = isulad_cgfsng_monitor_delegate_controllers;
-	cgfsng_ops->payload_delegate_controllers = isulad_cgfsng_payload_delegate_controllers;
-	cgfsng_ops->payload_create = isulad_cgfsng_payload_create;
-	cgfsng_ops->payload_enter = isulad_cgfsng_payload_enter;
-	cgfsng_ops->finalize = isulad_cgfsng_finalize;
-	cgfsng_ops->get_cgroup = isulad_cgfsng_get_cgroup;
-	cgfsng_ops->get = isulad_cgfsng_get;
-	cgfsng_ops->set = isulad_cgfsng_set;
-	cgfsng_ops->freeze = isulad_cgfsng_freeze;
-	cgfsng_ops->unfreeze = isulad_cgfsng_unfreeze;
-	cgfsng_ops->setup_limits_legacy = isulad_cgfsng_setup_limits_legacy;
-	cgfsng_ops->setup_limits = isulad_cgfsng_setup_limits;
-	cgfsng_ops->driver = "isulad_cgfsng";
-	cgfsng_ops->version = "1.0.0";
-	cgfsng_ops->attach = isulad_cgfsng_attach;
-	cgfsng_ops->chown = isulad_cgfsng_chown;
-	cgfsng_ops->mount = isulad_cgfsng_mount;
-	cgfsng_ops->devices_activate = isulad_cgfsng_devices_activate;
-
-	cgfsng_ops->criu_escape = isulad_cgfsng_criu_escape;
-	cgfsng_ops->criu_num_hierarchies = isulad_cgfsng_criu_num_hierarchies;
-	cgfsng_ops->criu_get_hierarchies = isulad_cgfsng_criu_get_hierarchies;
-
-	return move_ptr(cgfsng_ops);
-}
-
-static int __unified_attach_fd(const struct lxc_conf *conf, const char *lxcpath, int fd_unified, pid_t pid)
-{
-	int ret;
-
-	if (!list_empty(&conf->id_map)) {
-		struct userns_exec_unified_attach_data args = {
-			.conf		= conf,
-			.unified_fd	= fd_unified,
-			.pid		= pid,
-			.unprivileged	= am_guest_unpriv(),
-			.lxcpath	= lxcpath,
-		};
-
-		ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, args.sk_pair);
-		if (ret < 0)
-			return -errno;
-
-		ret = userns_exec_minimal(conf,
-					  cgroup_unified_attach_parent_wrapper,
-					  &args,
-					  cgroup_unified_attach_child_wrapper,
-					  &args);
-	} else {
-		ret = cgroup_attach_leaf(conf, fd_unified, pid);
-	}
-
-	return ret;
-}
-
-static int __cgroup_attach_many(const struct lxc_conf *conf, const char *name,
-				const char *lxcpath, pid_t pid)
-{
-	call_cleaner(put_cgroup_ctx) struct cgroup_ctx *ctx = &(struct cgroup_ctx){};
-	int ret;
-	size_t idx;
-	ssize_t pidstr_len;
-	char pidstr[INTTYPE_TO_STRLEN(pid_t)];
-
-	ret = lxc_cmd_get_cgroup_ctx(name, lxcpath, sizeof(struct cgroup_ctx), ctx);
-	if (ret < 0)
-		return ret_errno(ENOSYS);
-
-	if (ctx->fd_len == 0)
-		return log_trace(0, "Container runs with unwritable %s cgroup layout",
-				 cgroup_layout_name(ctx->layout));
-
-	pidstr_len = strnprintf(pidstr, sizeof(pidstr), "%d", pid);
-	if (pidstr_len < 0)
-		return pidstr_len;
-
-	for (idx = 0; idx < ctx->fd_len; idx++) {
-		int dfd_con = ctx->fd[idx];
-
-		if (unified_cgroup_fd(dfd_con))
-			ret = __unified_attach_fd(conf, lxcpath, dfd_con, pid);
-		else
-			ret = lxc_writeat(dfd_con, "cgroup.procs", pidstr, pidstr_len);
-		if (ret)
-			return syserror_ret(ret, "Failed to attach to cgroup fd %d", dfd_con);
-		else
-			TRACE("Attached to cgroup fd %d", dfd_con);
-	}
-
-	TRACE("Attached to %s cgroup layout", cgroup_layout_name(ctx->layout));
-	return 0;
-}
-
-static int __cgroup_attach_unified(const struct lxc_conf *conf, const char *name,
-				   const char *lxcpath, pid_t pid)
-{
-	__do_close int dfd_unified = -EBADF;
-
-	if (!conf || is_empty_string(name) || is_empty_string(lxcpath) || pid <= 0)
-		return ret_errno(EINVAL);
-
-	dfd_unified = lxc_cmd_get_cgroup2_fd(name, lxcpath);
-	if (dfd_unified < 0)
-		return ret_errno(ENOSYS);
-
-	return __unified_attach_fd(conf, lxcpath, dfd_unified, pid);
-}
-
-int cgroup_attach(const struct lxc_conf *conf, const char *name,
-		  const char *lxcpath, pid_t pid)
-{
-	int ret;
-
-	ret = __cgroup_attach_many(conf, name, lxcpath, pid);
-	if (ret < 0) {
-		if (!ERRNO_IS_NOT_SUPPORTED(ret))
-			return ret;
-
-		ret = __cgroup_attach_unified(conf, name, lxcpath, pid);
-		if (ret < 0 && ERRNO_IS_NOT_SUPPORTED(ret))
-			return ret_errno(ENOSYS);
-	}
-
-	return ret;
-}
-
-/* Connects to command socket therefore isn't callable from command handler. */
-int cgroup_get(const char *name, const char *lxcpath, const char *key, char *buf, size_t len)
-{
-	__do_close int dfd = -EBADF;
-	struct cgroup_fd fd = {
-		.fd = -EBADF,
-	};
-	size_t len_controller;
-	int ret;
-
-	if (is_empty_string(name) || is_empty_string(lxcpath) ||
-	    is_empty_string(key))
-		return ret_errno(EINVAL);
-
-	if ((buf && !len) || (len && !buf))
-		return ret_errno(EINVAL);
-
-	len_controller = strcspn(key, ".");
-	len_controller++; /* Don't forget the \0 byte. */
-	if (len_controller >= MAX_CGROUP_ROOT_NAMELEN)
-		return ret_errno(EINVAL);
-	(void)strlcpy(fd.controller, key, len_controller);
-
-	ret = lxc_cmd_get_limit_cgroup_fd(name, lxcpath, sizeof(struct cgroup_fd), &fd);
-	if (ret < 0) {
-		if (!ERRNO_IS_NOT_SUPPORTED(ret))
-			return ret;
-
-		dfd = lxc_cmd_get_limit_cgroup2_fd(name, lxcpath);
-		if (dfd < 0) {
-			if (!ERRNO_IS_NOT_SUPPORTED(ret))
-				return ret;
-
-			return ret_errno(ENOSYS);
-		}
-		fd.type = UNIFIED_HIERARCHY;
-		fd.fd = move_fd(dfd);
-	}
-	dfd = move_fd(fd.fd);
-
-	TRACE("Reading %s from %s cgroup hierarchy", key, cgroup_hierarchy_name(fd.type));
-
-	if (fd.type == UNIFIED_HIERARCHY && strequal(fd.controller, "devices"))
-		return ret_errno(EOPNOTSUPP);
-	else
-		ret = lxc_read_try_buf_at(dfd, key, buf, len);
-
-	return ret;
-}
-
-/* Connects to command socket therefore isn't callable from command handler. */
-int cgroup_set(const char *name, const char *lxcpath, const char *key, const char *value)
-{
-	__do_close int dfd = -EBADF;
-	struct cgroup_fd fd = {
-		.fd = -EBADF,
-	};
-	size_t len_controller;
-	int ret;
-
-	if (is_empty_string(name) || is_empty_string(lxcpath) ||
-	    is_empty_string(key) || is_empty_string(value))
-		return ret_errno(EINVAL);
-
-	len_controller = strcspn(key, ".");
-	len_controller++; /* Don't forget the \0 byte. */
-	if (len_controller >= MAX_CGROUP_ROOT_NAMELEN)
-		return ret_errno(EINVAL);
-	(void)strlcpy(fd.controller, key, len_controller);
-
-	ret = lxc_cmd_get_limit_cgroup_fd(name, lxcpath, sizeof(struct cgroup_fd), &fd);
-	if (ret < 0) {
-		if (!ERRNO_IS_NOT_SUPPORTED(ret))
-			return ret;
-
-		dfd = lxc_cmd_get_limit_cgroup2_fd(name, lxcpath);
-		if (dfd < 0) {
-			if (!ERRNO_IS_NOT_SUPPORTED(ret))
-				return ret;
-
-			return ret_errno(ENOSYS);
-		}
-		fd.type = UNIFIED_HIERARCHY;
-		fd.fd = move_fd(dfd);
-	}
-	dfd = move_fd(fd.fd);
-
-	TRACE("Setting %s to %s in %s cgroup hierarchy", key, value, cgroup_hierarchy_name(fd.type));
-
-	if (fd.type == UNIFIED_HIERARCHY && strequal(fd.controller, "devices")) {
-		struct device_item device = {};
-
-		ret = device_cgroup_rule_parse(&device, key, value);
-		if (ret < 0)
-			return log_error_errno(-1, EINVAL, "Failed to parse device string %s=%s",
-					       key, value);
-
-		ret = lxc_cmd_add_bpf_device_cgroup(name, lxcpath, &device);
-	} else {
-		ret = lxc_writeat(dfd, key, value, strlen(value));
-	}
-
-	return ret;
-}
-
-static int do_cgroup_freeze(int unified_fd,
-			    const char *state_string,
-			    int state_num,
-			    int timeout,
-			    const char *epoll_error,
-			    const char *wait_error)
-{
-	__do_close int events_fd = -EBADF;
-	call_cleaner(lxc_mainloop_close) struct lxc_async_descr *descr_ptr = NULL;
-	int ret;
-	struct lxc_async_descr descr = {};
-
-	if (timeout != 0) {
-		ret = lxc_mainloop_open(&descr);
-		if (ret)
-			return log_error_errno(-1, errno, "%s", epoll_error);
-
-		/* automatically cleaned up now */
-		descr_ptr = &descr;
-
-		events_fd = open_at(unified_fd, "cgroup.events", PROTECT_OPEN, PROTECT_LOOKUP_BENEATH, 0);
-		if (events_fd < 0)
-			return log_error_errno(-errno, errno, "Failed to open cgroup.events file");
-
-		ret = lxc_mainloop_add_handler_events(&descr, events_fd, EPOLLPRI,
-						      freezer_cgroup_events_cb,
-						      default_cleanup_handler,
-						      INT_TO_PTR(state_num),
-						      "freezer_cgroup_events_cb");
-		if (ret < 0)
-			return log_error_errno(-1, errno, "Failed to add cgroup.events fd handler to mainloop");
-	}
-
-	ret = lxc_writeat(unified_fd, "cgroup.freeze", state_string, 1);
-	if (ret < 0)
-		return log_error_errno(-1, errno, "Failed to open cgroup.freeze file");
-
-	if (timeout != 0) {
-		ret = lxc_mainloop(&descr, timeout);
-		if (ret)
-			return log_error_errno(-1, errno, "%s", wait_error);
-	}
-
-	return log_trace(0, "Container now %s", (state_num == 1) ? "frozen" : "unfrozen");
-}
-
-static inline int __cgroup_freeze(int unified_fd, int timeout)
-{
-	return do_cgroup_freeze(unified_fd, "1", 1, timeout,
-			        "Failed to create epoll instance to wait for container freeze",
-			        "Failed to wait for container to be frozen");
-}
-
-int cgroup_freeze(const char *name, const char *lxcpath, int timeout)
-{
-	__do_close int unified_fd = -EBADF;
-	int ret;
-
-	if (is_empty_string(name) || is_empty_string(lxcpath))
-		return ret_errno(EINVAL);
-
-	unified_fd = lxc_cmd_get_limit_cgroup2_fd(name, lxcpath);
-	if (unified_fd < 0)
-		return ret_errno(ENOCGROUP2);
-
-	lxc_cmd_notify_state_listeners(name, lxcpath, FREEZING);
-	ret = __cgroup_freeze(unified_fd, timeout);
-	lxc_cmd_notify_state_listeners(name, lxcpath, !ret ? FROZEN : RUNNING);
-	return ret;
-}
-
-int __cgroup_unfreeze(int unified_fd, int timeout)
-{
-	return do_cgroup_freeze(unified_fd, "0", 0, timeout,
-			        "Failed to create epoll instance to wait for container freeze",
-			        "Failed to wait for container to be frozen");
-}
-
-int cgroup_unfreeze(const char *name, const char *lxcpath, int timeout)
-{
-	__do_close int unified_fd = -EBADF;
-	int ret;
-
-	if (is_empty_string(name) || is_empty_string(lxcpath))
-		return ret_errno(EINVAL);
-
-	unified_fd = lxc_cmd_get_limit_cgroup2_fd(name, lxcpath);
-	if (unified_fd < 0)
-		return ret_errno(ENOCGROUP2);
-
-	lxc_cmd_notify_state_listeners(name, lxcpath, THAWED);
-	ret = __cgroup_unfreeze(unified_fd, timeout);
-	lxc_cmd_notify_state_listeners(name, lxcpath, !ret ? RUNNING : FROZEN);
-	return ret;
-}
-- 
2.25.1