b4e1563ffb
For low memory machines (256MB), 10% of RAM for /run may not be enough for re-exec of PID1 because 16MB of free space is required and /run may already contain something.
56 lines
2.5 KiB
C
56 lines
2.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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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 "macro.h"
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/* 4MB for contents of regular files, 64k inodes for directories, symbolic links and device specials,
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using 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 for /run should be enough for re-exec 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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/* 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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#define TMPFS_LIMITS_TMP ",size=10%,nr_inodes=400k"
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#define TMPFS_LIMITS_DEV_SHM TMPFS_LIMITS_TMP
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#define TMPFS_LIMITS_TEMPORARY_FS TMPFS_LIMITS_TMP
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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 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 **blacklist);
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int bind_remount_recursive_with_mountinfo(const char *prefix, unsigned long new_flags, unsigned long flags_mask, char **blacklist, 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(
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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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int umount_verbose(const char *where);
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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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