655f2da079
If a path passes though an autofs filesystem, then accessing the path might trigger and automount. As systemd-tmpfiles is run before the network is up, and as automounts are often used for networked filesystems, this can cause a deadlock. So chase_symlinks is enhance to accept a new flag which tells it to check for autofs, and return -EREMOTE if autofs is found. tmpfiles is changed to check just before acting on a path so that it can avoid autofs even if a symlink was created earlier by tmpfiles that would send this path through an autofs. This fixes a deadlock that happens when /home is listed in /etc/fstab as x-systemd.automount for an NFS directory.
101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
#pragma once
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <fcntl.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/inotify.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "time-util.h"
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int unlink_noerrno(const char *path);
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int rmdir_parents(const char *path, const char *stop);
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int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char *newpath);
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int readlinkat_malloc(int fd, const char *p, char **ret);
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int readlink_malloc(const char *p, char **r);
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int readlink_value(const char *p, char **ret);
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int readlink_and_make_absolute(const char *p, char **r);
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int readlink_and_canonicalize(const char *p, const char *root, char **r);
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int readlink_and_make_absolute_root(const char *root, const char *path, char **ret);
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int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
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int fchmod_umask(int fd, mode_t mode);
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int fd_warn_permissions(const char *path, int fd);
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#define laccess(path, mode) faccessat(AT_FDCWD, (path), (mode), AT_SYMLINK_NOFOLLOW)
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int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode);
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int touch(const char *path);
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int symlink_idempotent(const char *from, const char *to);
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int symlink_atomic(const char *from, const char *to);
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int mknod_atomic(const char *path, mode_t mode, dev_t dev);
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int mkfifo_atomic(const char *path, mode_t mode);
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int get_files_in_directory(const char *path, char ***list);
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int tmp_dir(const char **ret);
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int var_tmp_dir(const char **ret);
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#define INOTIFY_EVENT_MAX (sizeof(struct inotify_event) + NAME_MAX + 1)
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#define FOREACH_INOTIFY_EVENT(e, buffer, sz) \
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for ((e) = &buffer.ev; \
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(uint8_t*) (e) < (uint8_t*) (buffer.raw) + (sz); \
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(e) = (struct inotify_event*) ((uint8_t*) (e) + sizeof(struct inotify_event) + (e)->len))
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union inotify_event_buffer {
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struct inotify_event ev;
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uint8_t raw[INOTIFY_EVENT_MAX];
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};
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int inotify_add_watch_fd(int fd, int what, uint32_t mask);
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enum {
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CHASE_PREFIX_ROOT = 1, /* If set, the specified path will be prefixed by the specified root before beginning the iteration */
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CHASE_NONEXISTENT = 2, /* If set, it's OK if the path doesn't actually exist. */
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CHASE_NO_AUTOFS = 4, /* If set, return -EREMOTE if autofs mount point found */
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};
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int chase_symlinks(const char *path_with_prefix, const char *root, unsigned flags, char **ret);
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/* Useful for usage with _cleanup_(), removes a directory and frees the pointer */
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static inline void rmdir_and_free(char *p) {
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(void) rmdir(p);
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free(p);
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(char*, rmdir_and_free);
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static inline void unlink_and_free(char *p) {
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(void) unlink(p);
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free(p);
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(char*, unlink_and_free);
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