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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <mntent.h>
#include <stdio.h>
#include <unistd.h>
#include "errno-util.h"
#include "macro.h"
/* 4MB for contents of regular files, 64k inodes for directories, symbolic links and device specials, using
* large storage array systems as a baseline */
#define TMPFS_LIMITS_DEV ",size=4m,nr_inodes=64k"
/* Very little, if any use expected */
#define TMPFS_LIMITS_EMPTY_OR_ALMOST ",size=4m,nr_inodes=1k"
#define TMPFS_LIMITS_SYS TMPFS_LIMITS_EMPTY_OR_ALMOST
#define TMPFS_LIMITS_SYS_FS_CGROUP TMPFS_LIMITS_EMPTY_OR_ALMOST
/* On an extremely small device with only 256MB of RAM, 20% of RAM should be enough for the re-execution of
* PID1 because 16MB of free space is required. */
#define TMPFS_LIMITS_RUN ",size=20%,nr_inodes=800k"
/* The limit used for various nested tmpfs mounts, in paricular for guests started by systemd-nspawn.
* 10% of RAM (using 16GB of RAM as a baseline) translates to 400k inodes (assuming 4k each) and 25%
* translates to 1M inodes.
* (On the host, /tmp is configured through a .mount unit file.) */
#define NESTED_TMPFS_LIMITS ",size=10%,nr_inodes=400k"
/* More space for volatile root and /var */
#define TMPFS_LIMITS_VAR ",size=25%,nr_inodes=1m"
#define TMPFS_LIMITS_ROOTFS TMPFS_LIMITS_VAR
#define TMPFS_LIMITS_VOLATILE_STATE TMPFS_LIMITS_VAR
int mount_fd(const char *source, int target_fd, const char *filesystemtype, unsigned long mountflags, const void *data);
int mount_nofollow(const char *source, const char *target, const char *filesystemtype, unsigned long mountflags, const void *data);
int repeat_unmount(const char *path, int flags);
int umount_recursive(const char *target, int flags);
int bind_remount_recursive(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **deny_list);
int bind_remount_recursive_with_mountinfo(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **deny_list, FILE *proc_self_mountinfo);
int bind_remount_one_with_mountinfo(const char *path, unsigned long new_flags, unsigned long flags_mask, FILE *proc_self_mountinfo);
int mount_move_root(const char *path);
DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
#define _cleanup_endmntent_ _cleanup_(endmntentp)
int mount_verbose_full(
int error_log_level,
const char *what,
const char *where,
const char *type,
unsigned long flags,
const char *options,
bool follow_symlink);
static inline int mount_follow_verbose(
int error_log_level,
const char *what,
const char *where,
const char *type,
unsigned long flags,
const char *options) {
return mount_verbose_full(error_log_level, what, where, type, flags, options, true);
}
static inline int mount_nofollow_verbose(
int error_log_level,
const char *what,
const char *where,
const char *type,
unsigned long flags,
const char *options) {
return mount_verbose_full(error_log_level, what, where, type, flags, options, false);
}
int umount_verbose(
int error_log_level,
const char *where,
int flags);
int mount_option_mangle(
const char *options,
unsigned long mount_flags,
unsigned long *ret_mount_flags,
char **ret_remaining_options);
int mode_to_inaccessible_node(const char *runtime_dir, mode_t mode, char **dest);
/* Useful for usage with _cleanup_(), unmounts, removes a directory and frees the pointer */
static inline char* umount_and_rmdir_and_free(char *p) {
PROTECT_ERRNO;
(void) umount_recursive(p, 0);
(void) rmdir(p);
free(p);
return NULL;
}
DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free);
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