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1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ | |
2 | #pragma once | |
3 | ||
4 | #include "forward.h" | |
5 | ||
6 | /* The limit used for /dev itself. 4MB should be enough since device nodes and symlinks don't | |
7 | * consume any space and udev isn't supposed to create regular file either. There's no limit on the | |
8 | * max number of inodes since such limit is hard to guess especially on large storage array | |
9 | * systems. */ | |
10 | #define TMPFS_LIMITS_DEV ",size=4m" | |
11 | ||
12 | /* The limit used for /dev in private namespaces. 4MB for contents of regular files. The number of | |
13 | * inodes should be relatively low in private namespaces but for now use a 64k limit. */ | |
14 | #define TMPFS_LIMITS_PRIVATE_DEV ",size=4m,nr_inodes=64k" | |
15 | ||
16 | /* Very little, if any use expected */ | |
17 | #define TMPFS_LIMITS_EMPTY_OR_ALMOST ",size=4m,nr_inodes=1k" | |
18 | #define TMPFS_LIMITS_SYS TMPFS_LIMITS_EMPTY_OR_ALMOST | |
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. */ | |
22 | #define TMPFS_LIMITS_RUN ",size=20%,nr_inodes=800k" | |
23 | ||
24 | /* The limit used for various nested tmpfs mounts, in particular for guests started by systemd-nspawn. | |
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 | * (On the host, /tmp is configured through a .mount unit file.) */ | |
28 | #define NESTED_TMPFS_LIMITS ",size=10%,nr_inodes=400k" | |
29 | ||
30 | /* More space for volatile root and /var */ | |
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 | ||
35 | bool is_name_to_handle_at_fatal_error(int err); | |
36 | ||
37 | int name_to_handle_at_loop(int fd, const char *path, struct file_handle **ret_handle, int *ret_mnt_id, int flags); | |
38 | int name_to_handle_at_try_fid(int fd, const char *path, struct file_handle **ret_handle, int *ret_mnt_id, int flags); | |
39 | ||
40 | bool file_handle_equal(const struct file_handle *a, const struct file_handle *b); | |
41 | ||
42 | int path_get_mnt_id_at_fallback(int dir_fd, const char *path, int *ret); | |
43 | int path_get_mnt_id_at(int dir_fd, const char *path, int *ret); | |
44 | static inline int path_get_mnt_id(const char *path, int *ret) { | |
45 | return path_get_mnt_id_at(AT_FDCWD, path, ret); | |
46 | } | |
47 | ||
48 | int is_mount_point_at(int fd, const char *filename, int flags); | |
49 | int path_is_mount_point_full(const char *path, const char *root, int flags); | |
50 | static inline int path_is_mount_point(const char *path) { | |
51 | return path_is_mount_point_full(path, NULL, 0); | |
52 | } | |
53 | ||
54 | bool fstype_is_network(const char *fstype); | |
55 | bool fstype_needs_quota(const char *fstype); | |
56 | bool fstype_is_api_vfs(const char *fstype); | |
57 | bool fstype_is_blockdev_backed(const char *fstype); | |
58 | bool fstype_is_ro(const char *fsype); | |
59 | bool fstype_can_discard(const char *fstype); | |
60 | bool fstype_can_uid_gid(const char *fstype); | |
61 | bool fstype_can_fmask_dmask(const char *fstype); | |
62 | ||
63 | const char* fstype_norecovery_option(const char *fstype); | |
64 | ||
65 | int dev_is_devtmpfs(void); | |
66 | ||
67 | int mount_nofollow( | |
68 | const char *source, | |
69 | const char *target, | |
70 | const char *filesystemtype, | |
71 | unsigned long mountflags, | |
72 | const void *data); | |
73 | ||
74 | const char* mount_propagation_flag_to_string(unsigned long flags); | |
75 | int mount_propagation_flag_from_string(const char *name, unsigned long *ret); | |
76 | bool mount_propagation_flag_is_valid(unsigned long flag); | |
77 | ||
78 | bool mount_new_api_supported(void); | |
79 | unsigned long ms_nosymfollow_supported(void); | |
80 | ||
81 | int mount_option_supported(const char *fstype, const char *key, const char *value); | |
82 | ||
83 | bool path_below_api_vfs(const char *p); |