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, using
12 * large storage array systems as a baseline */
13 #define TMPFS_LIMITS_DEV ",size=4m,nr_inodes=64k"
15 /* Very little, if any use expected */
16 #define TMPFS_LIMITS_EMPTY_OR_ALMOST ",size=4m,nr_inodes=1k"
17 #define TMPFS_LIMITS_SYS TMPFS_LIMITS_EMPTY_OR_ALMOST
18 #define TMPFS_LIMITS_SYS_FS_CGROUP TMPFS_LIMITS_EMPTY_OR_ALMOST
20 /* On an extremely small device with only 256MB of RAM, 20% of RAM should be enough for the re-execution of
21 * PID1 because 16MB of free space is required. */
22 #define TMPFS_LIMITS_RUN ",size=20%,nr_inodes=800k"
24 /* The limit used for various tmpfs mounts, but not /tmp itself.
25 * 10% of RAM (using 16GB of RAM as a baseline) translates to 400k inodes (assuming 4k each) and 25%
26 * translates to 1M inodes.
27 * /tmp is configured through a .mount unit file. */
28 #define TMPFS_LIMITS_TMP ",size=10%,nr_inodes=400k"
29 #define TMPFS_LIMITS_DEV_SHM TMPFS_LIMITS_TMP
30 #define TMPFS_LIMITS_TEMPORARY_FS TMPFS_LIMITS_TMP
32 /* More space for volatile root and /var */
33 #define TMPFS_LIMITS_VAR ",size=25%,nr_inodes=1m"
34 #define TMPFS_LIMITS_ROOTFS TMPFS_LIMITS_VAR
35 #define TMPFS_LIMITS_VOLATILE_STATE TMPFS_LIMITS_VAR
37 int repeat_unmount(const char *path
, int flags
);
38 int umount_recursive(const char *target
, int flags
);
39 int bind_remount_recursive(const char *prefix
, unsigned long new_flags
, unsigned long flags_mask
, char **deny_list
);
40 int bind_remount_recursive_with_mountinfo(const char *prefix
, unsigned long new_flags
, unsigned long flags_mask
, char **deny_list
, FILE *proc_self_mountinfo
);
41 int bind_remount_one_with_mountinfo(const char *path
, unsigned long new_flags
, unsigned long flags_mask
, FILE *proc_self_mountinfo
);
43 int mount_move_root(const char *path
);
45 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent
);
46 #define _cleanup_endmntent_ _cleanup_(endmntentp)
55 int umount_verbose(const char *where
);
57 int mount_option_mangle(
59 unsigned long mount_flags
,
60 unsigned long *ret_mount_flags
,
61 char **ret_remaining_options
);
63 int mode_to_inaccessible_node(const char *runtime_dir
, mode_t mode
, char **dest
);
65 /* Useful for usage with _cleanup_(), unmounts, removes a directory and frees the pointer */
66 static inline void umount_and_rmdir_and_free(char *p
) {
68 (void) umount_recursive(p
, 0);
72 DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free
);