15263807472

/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include "forward.h"

/* The limit used for /dev itself. 4MB should be enough since device nodes and symlinks don't
 * consume any space and udev isn't supposed to create regular file either. There's no limit on the
 * max number of inodes since such limit is hard to guess especially on large storage array
 * systems. */
#define TMPFS_LIMITS_DEV             ",size=4m"

/* The limit used for /dev in private namespaces. 4MB for contents of regular files. The number of
 * inodes should be relatively low in private namespaces but for now use a 64k limit. */
#define TMPFS_LIMITS_PRIVATE_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

/* 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 particular 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

bool is_name_to_handle_at_fatal_error(int err);

int name_to_handle_at_loop(int fd, const char *path, struct file_handle **ret_handle, int *ret_mnt_id, int flags);
int name_to_handle_at_try_fid(int fd, const char *path, struct file_handle **ret_handle, int *ret_mnt_id, int flags);

bool file_handle_equal(const struct file_handle *a, const struct file_handle *b);

int path_get_mnt_id_at_fallback(int dir_fd, const char *path, int *ret);
int path_get_mnt_id_at(int dir_fd, const char *path, int *ret);
static inline int path_get_mnt_id(const char *path, int *ret) {
        return path_get_mnt_id_at(AT_FDCWD, path, ret);
}

int is_mount_point_at(int fd, const char *filename, int flags);
int path_is_mount_point_full(const char *path, const char *root, int flags);
static inline int path_is_mount_point(const char *path) {
        return path_is_mount_point_full(path, NULL, 0);
}

bool fstype_is_network(const char *fstype);
bool fstype_needs_quota(const char *fstype);
bool fstype_is_api_vfs(const char *fstype);
bool fstype_is_blockdev_backed(const char *fstype);
bool fstype_is_ro(const char *fsype);
bool fstype_can_discard(const char *fstype);
bool fstype_can_uid_gid(const char *fstype);
bool fstype_can_fmask_dmask(const char *fstype);

const char* fstype_norecovery_option(const char *fstype);

int dev_is_devtmpfs(void);

int mount_nofollow(
                const char *source,
                const char *target,
                const char *filesystemtype,
                unsigned long mountflags,
                const void *data);

const char* mount_propagation_flag_to_string(unsigned long flags);
int mount_propagation_flag_from_string(const char *name, unsigned long *ret);
bool mount_propagation_flag_is_valid(unsigned long flag);

bool mount_new_api_supported(void);
unsigned long ms_nosymfollow_supported(void);

int mount_option_supported(const char *fstype, const char *key, const char *value);

bool path_below_api_vfs(const char *p);

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);	3,663✔
36
37	int name_to_handle_at_loop(int fd, const char path, struct file_handle ret_handle, int ret_mnt_id, int flags);	27,535✔
38	int name_to_handle_at_try_fid(int fd, const char path, struct file_handle ret_handle, int ret_mnt_id, int flags);	27,535✔
39
40	bool file_handle_equal(const struct file_handle a, const struct file_handle b);	13,763✔
41
UNCOV 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);	6,278✔
44	static inline int path_get_mnt_id(const char path, int ret) {	5,630✔
45	return path_get_mnt_id_at(AT_FDCWD, path, ret);	5,630✔
46	}
47
48	int is_mount_point_at(int fd, const char *filename, int flags);	80,227✔
49	int path_is_mount_point_full(const char path, const char root, int flags);	26,528✔
50	static inline int path_is_mount_point(const char *path) {	15,730✔
51	return path_is_mount_point_full(path, NULL, 0);	15,730✔
52	}
53
54	bool fstype_is_network(const char *fstype);	1,559✔
UNCOV 55	bool fstype_needs_quota(const char *fstype);	×
56	bool fstype_is_api_vfs(const char *fstype);	59✔
57	bool fstype_is_blockdev_backed(const char *fstype);	29✔
58	bool fstype_is_ro(const char *fsype);	2,796✔
59	bool fstype_can_discard(const char *fstype);	4✔
60	bool fstype_can_uid_gid(const char *fstype);	1✔
61	bool fstype_can_fmask_dmask(const char *fstype);	57✔
62
63	const char* fstype_norecovery_option(const char *fstype);	172✔
64
65	int dev_is_devtmpfs(void);	249✔
66
67	int mount_nofollow(	67,183✔
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);	9✔
75	int mount_propagation_flag_from_string(const char name, unsigned long ret);	8✔
76	bool mount_propagation_flag_is_valid(unsigned long flag);	2,219✔
77
78	bool mount_new_api_supported(void);	6,032✔
79	unsigned long ms_nosymfollow_supported(void);	4,880✔
80
81	int mount_option_supported(const char fstype, const char key, const char *value);	3,640✔
82
83	bool path_below_api_vfs(const char *p);	9,342✔

systemd / systemd / 15263807472

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