1 /* SPDX-License-Identifier: LGPL-2.1+ */
8 #include "errno-util.h"
11 /* 4MB for contents of regular files, 64k inodes for directories, symbolic links and device specials,
12 using large storage array systems as a baseline */
13 #define TMPFS_LIMITS_DEV ",size=4m,nr_inodes=64k"
14 /* Very little, if any use expected */
15 #define TMPFS_LIMITS_EMPTY_OR_ALMOST ",size=4m,nr_inodes=1k"
16 #define TMPFS_LIMITS_SYS TMPFS_LIMITS_EMPTY_OR_ALMOST
17 #define TMPFS_LIMITS_SYS_FS_CGROUP TMPFS_LIMITS_EMPTY_OR_ALMOST
18 /* On an extremely small device with only 256MB of RAM, 20% of RAM for /run should be enough for re-exec of
19 PID1 because 16MB of free space is required. */
20 #define TMPFS_LIMITS_RUN ",size=20%,nr_inodes=800k"
21 /* 10% of RAM (using 16GB of RAM as a baseline) translates to 400k inodes (assuming 4k each) and 25%
22 translates to 1M inodes */
23 #define TMPFS_LIMITS_TMP ",size=10%,nr_inodes=400k"
24 #define TMPFS_LIMITS_DEV_SHM TMPFS_LIMITS_TMP
25 #define TMPFS_LIMITS_TEMPORARY_FS TMPFS_LIMITS_TMP
26 /* More space for volatile root and /var */
27 #define TMPFS_LIMITS_VAR ",size=25%,nr_inodes=1m"
28 #define TMPFS_LIMITS_ROOTFS TMPFS_LIMITS_VAR
29 #define TMPFS_LIMITS_VOLATILE_STATE TMPFS_LIMITS_VAR
31 int repeat_unmount(const char *path
, int flags
);
32 int umount_recursive(const char *target
, int flags
);
33 int bind_remount_recursive(const char *prefix
, unsigned long new_flags
, unsigned long flags_mask
, char **deny_list
);
34 int bind_remount_recursive_with_mountinfo(const char *prefix
, unsigned long new_flags
, unsigned long flags_mask
, char **deny_list
, FILE *proc_self_mountinfo
);
35 int bind_remount_one_with_mountinfo(const char *path
, unsigned long new_flags
, unsigned long flags_mask
, FILE *proc_self_mountinfo
);
37 int mount_move_root(const char *path
);
39 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent
);
40 #define _cleanup_endmntent_ _cleanup_(endmntentp)
49 int umount_verbose(const char *where
);
51 int mount_option_mangle(
53 unsigned long mount_flags
,
54 unsigned long *ret_mount_flags
,
55 char **ret_remaining_options
);
57 int mode_to_inaccessible_node(const char *runtime_dir
, mode_t mode
, char **dest
);
59 /* Useful for usage with _cleanup_(), unmounts, removes a directory and frees the pointer */
60 static inline void umount_and_rmdir_and_free(char *p
) {
62 (void) umount_recursive(p
, 0);
66 DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free
);