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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
4349cd7c LP |
2 | #pragma once |
3 | ||
4349cd7c | 4 | #include <mntent.h> |
11c3a366 | 5 | #include <stdio.h> |
e49ee285 | 6 | #include <unistd.h> |
4e036b7a | 7 | |
e49ee285 | 8 | #include "errno-util.h" |
11c3a366 | 9 | #include "macro.h" |
4349cd7c | 10 | |
362a55fc ZJS |
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 */ | |
7d85383e | 13 | #define TMPFS_LIMITS_DEV ",size=4m,nr_inodes=64k" |
362a55fc | 14 | |
7d85383e TM |
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 | |
362a55fc ZJS |
19 | |
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. */ | |
b4e1563f | 22 | #define TMPFS_LIMITS_RUN ",size=20%,nr_inodes=800k" |
362a55fc | 23 | |
b67ec8e5 | 24 | /* The limit used for various nested tmpfs mounts, in paricular for guests started by systemd-nspawn. |
362a55fc ZJS |
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. | |
b67ec8e5 ZJS |
27 | * (On the host, /tmp is configured through a .mount unit file.) */ |
28 | #define NESTED_TMPFS_LIMITS ",size=10%,nr_inodes=400k" | |
362a55fc | 29 | |
b4e1563f | 30 | /* More space for volatile root and /var */ |
7d85383e TM |
31 | #define TMPFS_LIMITS_VAR ",size=25%,nr_inodes=1m" |
32 | #define TMPFS_LIMITS_ROOTFS TMPFS_LIMITS_VAR | |
33 | #define TMPFS_LIMITS_VOLATILE_STATE TMPFS_LIMITS_VAR | |
34 | ||
28126409 LP |
35 | int mount_fd(const char *source, int target_fd, const char *filesystemtype, unsigned long mountflags, const void *data); |
36 | int mount_nofollow(const char *source, const char *target, const char *filesystemtype, unsigned long mountflags, const void *data); | |
37 | ||
3f2c0bec | 38 | int repeat_unmount(const char *path, int flags); |
4349cd7c | 39 | int umount_recursive(const char *target, int flags); |
6b000af4 LP |
40 | int bind_remount_recursive(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **deny_list); |
41 | int bind_remount_recursive_with_mountinfo(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **deny_list, FILE *proc_self_mountinfo); | |
7cce68e1 | 42 | int bind_remount_one_with_mountinfo(const char *path, unsigned long new_flags, unsigned long flags_mask, FILE *proc_self_mountinfo); |
4349cd7c LP |
43 | |
44 | int mount_move_root(const char *path); | |
45 | ||
46 | DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent); | |
47 | #define _cleanup_endmntent_ _cleanup_(endmntentp) | |
4e036b7a | 48 | |
511a8cfe | 49 | int mount_verbose_full( |
60e76d48 ZJS |
50 | int error_log_level, |
51 | const char *what, | |
52 | const char *where, | |
53 | const char *type, | |
54 | unsigned long flags, | |
511a8cfe LP |
55 | const char *options, |
56 | bool follow_symlink); | |
57 | ||
58 | static inline int mount_follow_verbose( | |
59 | int error_log_level, | |
60 | const char *what, | |
61 | const char *where, | |
62 | const char *type, | |
63 | unsigned long flags, | |
64 | const char *options) { | |
65 | return mount_verbose_full(error_log_level, what, where, type, flags, options, true); | |
66 | } | |
67 | ||
68 | static inline int mount_nofollow_verbose( | |
69 | int error_log_level, | |
70 | const char *what, | |
71 | const char *where, | |
72 | const char *type, | |
73 | unsigned long flags, | |
74 | const char *options) { | |
75 | return mount_verbose_full(error_log_level, what, where, type, flags, options, false); | |
76 | } | |
77 | ||
60e76d48 | 78 | int umount_verbose(const char *where); |
83555251 | 79 | |
9e7f941a YW |
80 | int mount_option_mangle( |
81 | const char *options, | |
82 | unsigned long mount_flags, | |
83 | unsigned long *ret_mount_flags, | |
84 | char **ret_remaining_options); | |
be1791ad | 85 | |
e5f10caf | 86 | int mode_to_inaccessible_node(const char *runtime_dir, mode_t mode, char **dest); |
e49ee285 LP |
87 | |
88 | /* Useful for usage with _cleanup_(), unmounts, removes a directory and frees the pointer */ | |
89 | static inline void umount_and_rmdir_and_free(char *p) { | |
90 | PROTECT_ERRNO; | |
91 | (void) umount_recursive(p, 0); | |
92 | (void) rmdir(p); | |
93 | free(p); | |
94 | } | |
95 | DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free); |