fs.h

/*
 *
 * Copyright © 2013 Serge Hallyn
 * Author: Serge Hallyn <serge.hallyn@ubuntu.com>
 *
 * based on cgroup.c from
 * lxc: linux Container library
 * (C) Copyright IBM Corp. 2007, 2008
 * Authors:
 * Daniel Lezcano <daniel.lezcano at free.fr>
 *
 * 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
 */

#define UNIFIED_DIR CGDIR "/.cgm_unified"
#define UNIFIED_PIN UNIFIED_DIR "/.cgpin"
#define U_LEAF_NAME ".cgm_leaf"
#define U_LEAF "/" U_LEAF_NAME

extern char *all_controllers;
extern char *allow_autoremove_premounted;
extern int autoremove_premounted_set_release_agent;
struct keys_return_type;

bool premounted_should_allow_autoremove(const char *controller);
int collect_subsystems(char *extra_mounts, char *skip_mounts);
int setup_cgroup_mounts(void);
bool compute_pid_cgroup(pid_t pid, const char *controller, const char *cgroup,
		char *path, int *depth);
bool compute_proxy_cgroup(pid_t pid, const char *controller, const char *cgroup,
		char *path, int *depth);
bool may_access(pid_t pid, uid_t uid, gid_t gid, const char *path, int mode);
void get_pid_creds(pid_t pid, uid_t *uid, gid_t *gid);
char *file_read_string(void *parent, const char *path);
int file_read_pids(void *parent, const char *path, int32_t **pids,
		int *alloced_pids, int *nrpids);
void get_pid_creds(pid_t pid, uid_t *uid, gid_t *gid);
const char *get_controller_path(const char *controller);
bool hostuid_to_ns(uid_t uid, pid_t pid, uid_t *answer);
bool chown_cgroup_path(const char *path, uid_t uid, gid_t gid,
		       bool all_children, bool is_unified);
bool chmod_cgroup_path(const char *path, int mode);
bool set_value(const char *controller, const char *path, const char *value);
bool set_value_trusted(const char *path, const char *value);
unsigned long read_pid_ns_link(int pid);
unsigned long read_user_ns_link(int pid);
bool realpath_escapes(char *path, char *safety);
bool file_exists(const char *path);
bool dir_exists(const char *path);
bool move_self_to_root(void);
int get_directory_children(void *parent, const char *path, char ***output);
int get_directory_contents(void *parent, const char *path, struct keys_return_type ***output);
bool setup_base_run_path(void);
bool create_agent_symlinks(void);
bool was_premounted(const char *controller);
void do_prune_comounts(char *controllers);
bool prune_verify_comounts(char *controllers);
void do_list_controllers(void *parent, char ***output);
void convert_directory_contents(struct keys_return_type **keys, struct ucred r);
bool path_is_under_proxycg(pid_t pid, const char *contr,const char *path);
bool unified_copy_controllers(const char *controller, const char *path);
bool is_unified_controller(const char *controller);
bool create_leaf(const char *controller, const char *path, uid_t u, gid_t g);
bool ensure_leafdir(const char *controller, const char *path);
void turn_mount_rw(const char *path);
bool is_ro_mount(const char *path);