mirror of
https://github.com/morgan9e/systemd
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72 lines
3.3 KiB
C
72 lines
3.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <fcntl.h>
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#include <stdbool.h>
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#include <sys/types.h>
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/* The limit used for /dev itself. 4MB should be enough since device nodes and symlinks don't
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* consume any space and udev isn't supposed to create regular file either. There's no limit on the
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* max number of inodes since such limit is hard to guess especially on large storage array
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* systems. */
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#define TMPFS_LIMITS_DEV ",size=4m"
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/* The limit used for /dev in private namespaces. 4MB for contents of regular files. The number of
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* inodes should be relatively low in private namespaces but for now use a 64k limit. */
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#define TMPFS_LIMITS_PRIVATE_DEV ",size=4m,nr_inodes=64k"
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/* Very little, if any use expected */
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#define TMPFS_LIMITS_EMPTY_OR_ALMOST ",size=4m,nr_inodes=1k"
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#define TMPFS_LIMITS_SYS TMPFS_LIMITS_EMPTY_OR_ALMOST
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#define TMPFS_LIMITS_SYS_FS_CGROUP TMPFS_LIMITS_EMPTY_OR_ALMOST
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/* On an extremely small device with only 256MB of RAM, 20% of RAM should be enough for the re-execution of
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* PID1 because 16MB of free space is required. */
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#define TMPFS_LIMITS_RUN ",size=20%,nr_inodes=800k"
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/* The limit used for various nested tmpfs mounts, in particular for guests started by systemd-nspawn.
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* 10% of RAM (using 16GB of RAM as a baseline) translates to 400k inodes (assuming 4k each) and 25%
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* translates to 1M inodes.
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* (On the host, /tmp is configured through a .mount unit file.) */
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#define NESTED_TMPFS_LIMITS ",size=10%,nr_inodes=400k"
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/* More space for volatile root and /var */
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#define TMPFS_LIMITS_VAR ",size=25%,nr_inodes=1m"
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#define TMPFS_LIMITS_ROOTFS TMPFS_LIMITS_VAR
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#define TMPFS_LIMITS_VOLATILE_STATE TMPFS_LIMITS_VAR
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int name_to_handle_at_loop(int fd, const char *path, struct file_handle **ret_handle, int *ret_mnt_id, int flags);
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int path_get_mnt_id_at_fallback(int dir_fd, const char *path, int *ret);
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int path_get_mnt_id_at(int dir_fd, const char *path, int *ret);
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static inline int path_get_mnt_id(const char *path, int *ret) {
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return path_get_mnt_id_at(AT_FDCWD, path, ret);
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}
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int fd_is_mount_point(int fd, const char *filename, int flags);
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int path_is_mount_point(const char *path, const char *root, int flags);
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bool fstype_is_network(const char *fstype);
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bool fstype_needs_quota(const char *fstype);
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bool fstype_is_api_vfs(const char *fstype);
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bool fstype_is_blockdev_backed(const char *fstype);
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bool fstype_is_ro(const char *fsype);
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bool fstype_can_discard(const char *fstype);
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bool fstype_can_uid_gid(const char *fstype);
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bool fstype_can_norecovery(const char *fstype);
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bool fstype_can_umask(const char *fstype);
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int dev_is_devtmpfs(void);
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int mount_fd(const char *source, int target_fd, const char *filesystemtype, unsigned long mountflags, const void *data);
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int mount_nofollow(const char *source, const char *target, const char *filesystemtype, unsigned long mountflags, const void *data);
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const char *mount_propagation_flag_to_string(unsigned long flags);
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int mount_propagation_flag_from_string(const char *name, unsigned long *ret);
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bool mount_propagation_flag_is_valid(unsigned long flag);
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bool mount_new_api_supported(void);
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unsigned long ms_nosymfollow_supported(void);
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int mount_option_supported(const char *fstype, const char *key, const char *value);
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