100 lines
4.0 KiB
C
100 lines
4.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include <mntent.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "errno-util.h"
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#include "macro.h"
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/* 4MB for contents of regular files, 64k inodes for directories, symbolic links and device specials, using
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* large storage array systems as a baseline */
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#define TMPFS_LIMITS_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 paricular 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 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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int repeat_unmount(const char *path, int flags);
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int umount_recursive(const char *target, int flags);
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int bind_remount_recursive(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **deny_list);
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int bind_remount_recursive_with_mountinfo(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **deny_list, FILE *proc_self_mountinfo);
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int bind_remount_one_with_mountinfo(const char *path, unsigned long new_flags, unsigned long flags_mask, FILE *proc_self_mountinfo);
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int mount_move_root(const char *path);
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DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
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#define _cleanup_endmntent_ _cleanup_(endmntentp)
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int mount_verbose_full(
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int error_log_level,
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const char *what,
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const char *where,
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const char *type,
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unsigned long flags,
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const char *options,
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bool follow_symlink);
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static inline int mount_follow_verbose(
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int error_log_level,
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const char *what,
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const char *where,
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const char *type,
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unsigned long flags,
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const char *options) {
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return mount_verbose_full(error_log_level, what, where, type, flags, options, true);
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}
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static inline int mount_nofollow_verbose(
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int error_log_level,
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const char *what,
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const char *where,
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const char *type,
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unsigned long flags,
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const char *options) {
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return mount_verbose_full(error_log_level, what, where, type, flags, options, false);
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}
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int umount_verbose(
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int error_log_level,
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const char *where,
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int flags);
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int mount_option_mangle(
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const char *options,
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unsigned long mount_flags,
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unsigned long *ret_mount_flags,
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char **ret_remaining_options);
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int mode_to_inaccessible_node(const char *runtime_dir, mode_t mode, char **dest);
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/* Useful for usage with _cleanup_(), unmounts, removes a directory and frees the pointer */
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static inline char* umount_and_rmdir_and_free(char *p) {
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PROTECT_ERRNO;
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(void) umount_recursive(p, 0);
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(void) rmdir(p);
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free(p);
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return NULL;
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free);
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