Adding upstream version 247.3.upstream/247.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2619 insertions, 0 deletions

diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
new file mode 100644
index 0000000..10ebc3e
--- /dev/null
+++ b/src/journal/journald-server.c
@@ -0,0 +1,2619 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#if HAVE_SELINUX
+#include <selinux/selinux.h>
+#endif
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/signalfd.h>
+#include <sys/statvfs.h>
+#include <linux/sockios.h>
+
+#include "sd-daemon.h"
+#include "sd-journal.h"
+#include "sd-messages.h"
+
+#include "acl-util.h"
+#include "alloc-util.h"
+#include "audit-util.h"
+#include "cgroup-util.h"
+#include "conf-parser.h"
+#include "dirent-util.h"
+#include "extract-word.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "format-util.h"
+#include "fs-util.h"
+#include "hashmap.h"
+#include "hostname-util.h"
+#include "id128-util.h"
+#include "io-util.h"
+#include "journal-authenticate.h"
+#include "journal-file.h"
+#include "journal-internal.h"
+#include "journal-vacuum.h"
+#include "journald-audit.h"
+#include "journald-context.h"
+#include "journald-kmsg.h"
+#include "journald-native.h"
+#include "journald-rate-limit.h"
+#include "journald-server.h"
+#include "journald-stream.h"
+#include "journald-syslog.h"
+#include "log.h"
+#include "missing_audit.h"
+#include "mkdir.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "process-util.h"
+#include "rm-rf.h"
+#include "selinux-util.h"
+#include "signal-util.h"
+#include "socket-util.h"
+#include "stdio-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "syslog-util.h"
+#include "user-record.h"
+#include "user-util.h"
+
+#define USER_JOURNALS_MAX 1024
+
+#define DEFAULT_SYNC_INTERVAL_USEC (5*USEC_PER_MINUTE)
+#define DEFAULT_RATE_LIMIT_INTERVAL (30*USEC_PER_SEC)
+#define DEFAULT_RATE_LIMIT_BURST 10000
+#define DEFAULT_MAX_FILE_USEC USEC_PER_MONTH
+
+#define RECHECK_SPACE_USEC (30*USEC_PER_SEC)
+
+#define NOTIFY_SNDBUF_SIZE (8*1024*1024)
+
+/* The period to insert between posting changes for coalescing */
+#define POST_CHANGE_TIMER_INTERVAL_USEC (250*USEC_PER_MSEC)
+
+/* Pick a good default that is likely to fit into AF_UNIX and AF_INET SOCK_DGRAM datagrams, and even leaves some room
+ * for a bit of additional metadata. */
+#define DEFAULT_LINE_MAX (48*1024)
+
+#define DEFERRED_CLOSES_MAX (4096)
+
+#define IDLE_TIMEOUT_USEC (30*USEC_PER_SEC)
+
+static int determine_path_usage(
+                Server *s,
+                const char *path,
+                uint64_t *ret_used,
+                uint64_t *ret_free) {
+
+        _cleanup_closedir_ DIR *d = NULL;
+        struct dirent *de;
+        struct statvfs ss;
+
+        assert(s);
+        assert(path);
+        assert(ret_used);
+        assert(ret_free);
+
+        d = opendir(path);
+        if (!d)
+                return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR,
+                                      errno, "Failed to open %s: %m", path);
+
+        if (fstatvfs(dirfd(d), &ss) < 0)
+                return log_error_errno(errno, "Failed to fstatvfs(%s): %m", path);
+
+        *ret_free = ss.f_bsize * ss.f_bavail;
+        *ret_used = 0;
+        FOREACH_DIRENT_ALL(de, d, break) {
+                struct stat st;
+
+                if (!endswith(de->d_name, ".journal") &&
+                    !endswith(de->d_name, ".journal~"))
+                        continue;
+
+                if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
+                        log_debug_errno(errno, "Failed to stat %s/%s, ignoring: %m", path, de->d_name);
+                        continue;
+                }
+
+                if (!S_ISREG(st.st_mode))
+                        continue;
+
+                *ret_used += (uint64_t) st.st_blocks * 512UL;
+        }
+
+        return 0;
+}
+
+static void cache_space_invalidate(JournalStorageSpace *space) {
+        zero(*space);
+}
+
+static int cache_space_refresh(Server *s, JournalStorage *storage) {
+        JournalStorageSpace *space;
+        JournalMetrics *metrics;
+        uint64_t vfs_used, vfs_avail, avail;
+        usec_t ts;
+        int r;
+
+        assert(s);
+
+        metrics = &storage->metrics;
+        space = &storage->space;
+
+        ts = now(CLOCK_MONOTONIC);
+
+        if (space->timestamp != 0 && space->timestamp + RECHECK_SPACE_USEC > ts)
+                return 0;
+
+        r = determine_path_usage(s, storage->path, &vfs_used, &vfs_avail);
+        if (r < 0)
+                return r;
+
+        space->vfs_used = vfs_used;
+        space->vfs_available = vfs_avail;
+
+        avail = LESS_BY(vfs_avail, metrics->keep_free);
+
+        space->limit = MIN(MAX(vfs_used + avail, metrics->min_use), metrics->max_use);
+        space->available = LESS_BY(space->limit, vfs_used);
+        space->timestamp = ts;
+        return 1;
+}
+
+static void patch_min_use(JournalStorage *storage) {
+        assert(storage);
+
+        /* Let's bump the min_use limit to the current usage on disk. We do
+         * this when starting up and first opening the journal files. This way
+         * sudden spikes in disk usage will not cause journald to vacuum files
+         * without bounds. Note that this means that only a restart of journald
+         * will make it reset this value. */
+
+        storage->metrics.min_use = MAX(storage->metrics.min_use, storage->space.vfs_used);
+}
+
+static JournalStorage* server_current_storage(Server *s) {
+        assert(s);
+
+        return s->system_journal ? &s->system_storage : &s->runtime_storage;
+}
+
+static int determine_space(Server *s, uint64_t *available, uint64_t *limit) {
+        JournalStorage *js;
+        int r;
+
+        assert(s);
+
+        js = server_current_storage(s);
+
+        r = cache_space_refresh(s, js);
+        if (r >= 0) {
+                if (available)
+                        *available = js->space.available;
+                if (limit)
+                        *limit = js->space.limit;
+        }
+        return r;
+}
+
+void server_space_usage_message(Server *s, JournalStorage *storage) {
+        char fb1[FORMAT_BYTES_MAX], fb2[FORMAT_BYTES_MAX], fb3[FORMAT_BYTES_MAX],
+             fb4[FORMAT_BYTES_MAX], fb5[FORMAT_BYTES_MAX], fb6[FORMAT_BYTES_MAX];
+        JournalMetrics *metrics;
+
+        assert(s);
+
+        if (!storage)
+                storage = server_current_storage(s);
+
+        if (cache_space_refresh(s, storage) < 0)
+                return;
+
+        metrics = &storage->metrics;
+        format_bytes(fb1, sizeof(fb1), storage->space.vfs_used);
+        format_bytes(fb2, sizeof(fb2), metrics->max_use);
+        format_bytes(fb3, sizeof(fb3), metrics->keep_free);
+        format_bytes(fb4, sizeof(fb4), storage->space.vfs_available);
+        format_bytes(fb5, sizeof(fb5), storage->space.limit);
+        format_bytes(fb6, sizeof(fb6), storage->space.available);
+
+        server_driver_message(s, 0,
+                              "MESSAGE_ID=" SD_MESSAGE_JOURNAL_USAGE_STR,
+                              LOG_MESSAGE("%s (%s) is %s, max %s, %s free.",
+                                          storage->name, storage->path, fb1, fb5, fb6),
+                              "JOURNAL_NAME=%s", storage->name,
+                              "JOURNAL_PATH=%s", storage->path,
+                              "CURRENT_USE=%"PRIu64, storage->space.vfs_used,
+                              "CURRENT_USE_PRETTY=%s", fb1,
+                              "MAX_USE=%"PRIu64, metrics->max_use,
+                              "MAX_USE_PRETTY=%s", fb2,
+                              "DISK_KEEP_FREE=%"PRIu64, metrics->keep_free,
+                              "DISK_KEEP_FREE_PRETTY=%s", fb3,
+                              "DISK_AVAILABLE=%"PRIu64, storage->space.vfs_available,
+                              "DISK_AVAILABLE_PRETTY=%s", fb4,
+                              "LIMIT=%"PRIu64, storage->space.limit,
+                              "LIMIT_PRETTY=%s", fb5,
+                              "AVAILABLE=%"PRIu64, storage->space.available,
+                              "AVAILABLE_PRETTY=%s", fb6,
+                              NULL);
+}
+
+static bool uid_for_system_journal(uid_t uid) {
+
+        /* Returns true if the specified UID shall get its data stored in the system journal*/
+
+        return uid_is_system(uid) || uid_is_dynamic(uid) || uid == UID_NOBODY;
+}
+
+static void server_add_acls(JournalFile *f, uid_t uid) {
+        assert(f);
+
+#if HAVE_ACL
+        int r;
+
+        if (uid_for_system_journal(uid))
+                return;
+
+        r = fd_add_uid_acl_permission(f->fd, uid, ACL_READ);
+        if (r < 0)
+                log_warning_errno(r, "Failed to set ACL on %s, ignoring: %m", f->path);
+#endif
+}
+
+static int open_journal(
+                Server *s,
+                bool reliably,
+                const char *fname,
+                int flags,
+                bool seal,
+                JournalMetrics *metrics,
+                JournalFile **ret) {
+
+        _cleanup_(journal_file_closep) JournalFile *f = NULL;
+        int r;
+
+        assert(s);
+        assert(fname);
+        assert(ret);
+
+        if (reliably)
+                r = journal_file_open_reliably(fname, flags, 0640, s->compress.enabled, s->compress.threshold_bytes,
+                                               seal, metrics, s->mmap, s->deferred_closes, NULL, &f);
+        else
+                r = journal_file_open(-1, fname, flags, 0640, s->compress.enabled, s->compress.threshold_bytes, seal,
+                                      metrics, s->mmap, s->deferred_closes, NULL, &f);
+
+        if (r < 0)
+                return r;
+
+        r = journal_file_enable_post_change_timer(f, s->event, POST_CHANGE_TIMER_INTERVAL_USEC);
+        if (r < 0)
+                return r;
+
+        *ret = TAKE_PTR(f);
+        return r;
+}
+
+static bool flushed_flag_is_set(Server *s) {
+        const char *fn;
+
+        assert(s);
+
+        /* We don't support the "flushing" concept for namespace instances, we assume them to always have
+         * access to /var */
+        if (s->namespace)
+                return true;
+
+        fn = strjoina(s->runtime_directory, "/flushed");
+        return access(fn, F_OK) >= 0;
+}
+
+static int system_journal_open(Server *s, bool flush_requested, bool relinquish_requested) {
+        const char *fn;
+        int r = 0;
+
+        if (!s->system_journal &&
+            IN_SET(s->storage, STORAGE_PERSISTENT, STORAGE_AUTO) &&
+            (flush_requested || flushed_flag_is_set(s)) &&
+            !relinquish_requested) {
+
+                /* If in auto mode: first try to create the machine path, but not the prefix.
+                 *
+                 * If in persistent mode: create /var/log/journal and the machine path */
+
+                if (s->storage == STORAGE_PERSISTENT)
+                        (void) mkdir_parents(s->system_storage.path, 0755);
+
+                (void) mkdir(s->system_storage.path, 0755);
+
+                fn = strjoina(s->system_storage.path, "/system.journal");
+                r = open_journal(s, true, fn, O_RDWR|O_CREAT, s->seal, &s->system_storage.metrics, &s->system_journal);
+                if (r >= 0) {
+                        server_add_acls(s->system_journal, 0);
+                        (void) cache_space_refresh(s, &s->system_storage);
+                        patch_min_use(&s->system_storage);
+                } else {
+                        if (!IN_SET(r, -ENOENT, -EROFS))
+                                log_warning_errno(r, "Failed to open system journal: %m");
+
+                        r = 0;
+                }
+
+                /* If the runtime journal is open, and we're post-flush, we're recovering from a failed
+                 * system journal rotate (ENOSPC) for which the runtime journal was reopened.
+                 *
+                 * Perform an implicit flush to var, leaving the runtime journal closed, now that the system
+                 * journal is back.
+                 */
+                if (!flush_requested)
+                        (void) server_flush_to_var(s, true);
+        }
+
+        if (!s->runtime_journal &&
+            (s->storage != STORAGE_NONE)) {
+
+                fn = strjoina(s->runtime_storage.path, "/system.journal");
+
+                if (s->system_journal && !relinquish_requested) {
+
+                        /* Try to open the runtime journal, but only
+                         * if it already exists, so that we can flush
+                         * it into the system journal */
+
+                        r = open_journal(s, false, fn, O_RDWR, false, &s->runtime_storage.metrics, &s->runtime_journal);
+                        if (r < 0) {
+                                if (r != -ENOENT)
+                                        log_warning_errno(r, "Failed to open runtime journal: %m");
+
+                                r = 0;
+                        }
+
+                } else {
+
+                        /* OK, we really need the runtime journal, so create it if necessary. */
+
+                        (void) mkdir_parents(s->runtime_storage.path, 0755);
+                        (void) mkdir(s->runtime_storage.path, 0750);
+
+                        r = open_journal(s, true, fn, O_RDWR|O_CREAT, false, &s->runtime_storage.metrics, &s->runtime_journal);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to open runtime journal: %m");
+                }
+
+                if (s->runtime_journal) {
+                        server_add_acls(s->runtime_journal, 0);
+                        (void) cache_space_refresh(s, &s->runtime_storage);
+                        patch_min_use(&s->runtime_storage);
+                }
+        }
+
+        return r;
+}
+
+static JournalFile* find_journal(Server *s, uid_t uid) {
+        _cleanup_free_ char *p = NULL;
+        JournalFile *f;
+        int r;
+
+        assert(s);
+
+        /* A rotate that fails to create the new journal (ENOSPC) leaves the rotated journal as NULL.  Unless
+         * we revisit opening, even after space is made available we'll continue to return NULL indefinitely.
+         *
+         * system_journal_open() is a noop if the journals are already open, so we can just call it here to
+         * recover from failed rotates (or anything else that's left the journals as NULL).
+         *
+         * Fixes https://github.com/systemd/systemd/issues/3968 */
+        (void) system_journal_open(s, false, false);
+
+        /* We split up user logs only on /var, not on /run. If the runtime file is open, we write to it
+         * exclusively, in order to guarantee proper order as soon as we flush /run to /var and close the
+         * runtime file. */
+
+        if (s->runtime_journal)
+                return s->runtime_journal;
+
+        if (uid_for_system_journal(uid))
+                return s->system_journal;
+
+        f = ordered_hashmap_get(s->user_journals, UID_TO_PTR(uid));
+        if (f)
+                return f;
+
+        if (asprintf(&p, "%s/user-" UID_FMT ".journal", s->system_storage.path, uid) < 0) {
+                log_oom();
+                return s->system_journal;
+        }
+
+        /* Too many open? Then let's close one (or more) */
+        while (ordered_hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
+                assert_se(f = ordered_hashmap_steal_first(s->user_journals));
+                (void) journal_file_close(f);
+        }
+
+        r = open_journal(s, true, p, O_RDWR|O_CREAT, s->seal, &s->system_storage.metrics, &f);
+        if (r < 0)
+                return s->system_journal;
+
+        r = ordered_hashmap_put(s->user_journals, UID_TO_PTR(uid), f);
+        if (r < 0) {
+                (void) journal_file_close(f);
+                return s->system_journal;
+        }
+
+        server_add_acls(f, uid);
+        return f;
+}
+
+static int do_rotate(
+                Server *s,
+                JournalFile **f,
+                const char* name,
+                bool seal,
+                uint32_t uid) {
+
+        int r;
+        assert(s);
+
+        if (!*f)
+                return -EINVAL;
+
+        r = journal_file_rotate(f, s->compress.enabled, s->compress.threshold_bytes, seal, s->deferred_closes);
+        if (r < 0) {
+                if (*f)
+                        return log_error_errno(r, "Failed to rotate %s: %m", (*f)->path);
+                else
+                        return log_error_errno(r, "Failed to create new %s journal: %m", name);
+        }
+
+        server_add_acls(*f, uid);
+        return r;
+}
+
+static void server_process_deferred_closes(Server *s) {
+        JournalFile *f;
+
+        /* Perform any deferred closes which aren't still offlining. */
+        SET_FOREACH(f, s->deferred_closes) {
+                if (journal_file_is_offlining(f))
+                        continue;
+
+                (void) set_remove(s->deferred_closes, f);
+                (void) journal_file_close(f);
+        }
+}
+
+static void server_vacuum_deferred_closes(Server *s) {
+        assert(s);
+
+        /* Make some room in the deferred closes list, so that it doesn't grow without bounds */
+        if (set_size(s->deferred_closes) < DEFERRED_CLOSES_MAX)
+                return;
+
+        /* Let's first remove all journal files that might already have completed closing */
+        server_process_deferred_closes(s);
+
+        /* And now, let's close some more until we reach the limit again. */
+        while (set_size(s->deferred_closes) >= DEFERRED_CLOSES_MAX) {
+                JournalFile *f;
+
+                assert_se(f = set_steal_first(s->deferred_closes));
+                journal_file_close(f);
+        }
+}
+
+static int vacuum_offline_user_journals(Server *s) {
+        _cleanup_closedir_ DIR *d = NULL;
+        int r;
+
+        assert(s);
+
+        d = opendir(s->system_storage.path);
+        if (!d) {
+                if (errno == ENOENT)
+                        return 0;
+
+                return log_error_errno(errno, "Failed to open %s: %m", s->system_storage.path);
+        }
+
+        for (;;) {
+                _cleanup_free_ char *u = NULL, *full = NULL;
+                _cleanup_close_ int fd = -1;
+                const char *a, *b;
+                struct dirent *de;
+                JournalFile *f;
+                uid_t uid;
+
+                errno = 0;
+                de = readdir_no_dot(d);
+                if (!de) {
+                        if (errno != 0)
+                                log_warning_errno(errno, "Failed to enumerate %s, ignoring: %m", s->system_storage.path);
+
+                        break;
+                }
+
+                a = startswith(de->d_name, "user-");
+                if (!a)
+                        continue;
+                b = endswith(de->d_name, ".journal");
+                if (!b)
+                        continue;
+
+                u = strndup(a, b-a);
+                if (!u)
+                        return log_oom();
+
+                r = parse_uid(u, &uid);
+                if (r < 0) {
+                        log_debug_errno(r, "Failed to parse UID from file name '%s', ignoring: %m", de->d_name);
+                        continue;
+                }
+
+                /* Already rotated in the above loop? i.e. is it an open user journal? */
+                if (ordered_hashmap_contains(s->user_journals, UID_TO_PTR(uid)))
+                        continue;
+
+                full = path_join(s->system_storage.path, de->d_name);
+                if (!full)
+                        return log_oom();
+
+                fd = openat(dirfd(d), de->d_name, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW|O_NONBLOCK);
+                if (fd < 0) {
+                        log_full_errno(IN_SET(errno, ELOOP, ENOENT) ? LOG_DEBUG : LOG_WARNING, errno,
+                                       "Failed to open journal file '%s' for rotation: %m", full);
+                        continue;
+                }
+
+                /* Make some room in the set of deferred close()s */
+                server_vacuum_deferred_closes(s);
+
+                /* Open the file briefly, so that we can archive it */
+                r = journal_file_open(fd,
+                                      full,
+                                      O_RDWR,
+                                      0640,
+                                      s->compress.enabled,
+                                      s->compress.threshold_bytes,
+                                      s->seal,
+                                      &s->system_storage.metrics,
+                                      s->mmap,
+                                      s->deferred_closes,
+                                      NULL,
+                                      &f);
+                if (r < 0) {
+                        log_warning_errno(r, "Failed to read journal file %s for rotation, trying to move it out of the way: %m", full);
+
+                        r = journal_file_dispose(dirfd(d), de->d_name);
+                        if (r < 0)
+                                log_warning_errno(r, "Failed to move %s out of the way, ignoring: %m", full);
+                        else
+                                log_debug("Successfully moved %s out of the way.", full);
+
+                        continue;
+                }
+
+                TAKE_FD(fd); /* Donated to journal_file_open() */
+
+                r = journal_file_archive(f);
+                if (r < 0)
+                        log_debug_errno(r, "Failed to archive journal file '%s', ignoring: %m", full);
+
+                f = journal_initiate_close(f, s->deferred_closes);
+        }
+
+        return 0;
+}
+
+void server_rotate(Server *s) {
+        JournalFile *f;
+        void *k;
+        int r;
+
+        log_debug("Rotating...");
+
+        /* First, rotate the system journal (either in its runtime flavour or in its runtime flavour) */
+        (void) do_rotate(s, &s->runtime_journal, "runtime", false, 0);
+        (void) do_rotate(s, &s->system_journal, "system", s->seal, 0);
+
+        /* Then, rotate all user journals we have open (keeping them open) */
+        ORDERED_HASHMAP_FOREACH_KEY(f, k, s->user_journals) {
+                r = do_rotate(s, &f, "user", s->seal, PTR_TO_UID(k));
+                if (r >= 0)
+                        ordered_hashmap_replace(s->user_journals, k, f);
+                else if (!f)
+                        /* Old file has been closed and deallocated */
+                        ordered_hashmap_remove(s->user_journals, k);
+        }
+
+        /* Finally, also rotate all user journals we currently do not have open. (But do so only if we
+         * actually have access to /var, i.e. are not in the log-to-runtime-journal mode). */
+        if (!s->runtime_journal)
+                (void) vacuum_offline_user_journals(s);
+
+        server_process_deferred_closes(s);
+}
+
+void server_sync(Server *s) {
+        JournalFile *f;
+        int r;
+
+        if (s->system_journal) {
+                r = journal_file_set_offline(s->system_journal, false);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to sync system journal, ignoring: %m");
+        }
+
+        ORDERED_HASHMAP_FOREACH(f, s->user_journals) {
+                r = journal_file_set_offline(f, false);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to sync user journal, ignoring: %m");
+        }
+
+        if (s->sync_event_source) {
+                r = sd_event_source_set_enabled(s->sync_event_source, SD_EVENT_OFF);
+                if (r < 0)
+                        log_error_errno(r, "Failed to disable sync timer source: %m");
+        }
+
+        s->sync_scheduled = false;
+}
+
+static void do_vacuum(Server *s, JournalStorage *storage, bool verbose) {
+
+        int r;
+
+        assert(s);
+        assert(storage);
+
+        (void) cache_space_refresh(s, storage);
+
+        if (verbose)
+                server_space_usage_message(s, storage);
+
+        r = journal_directory_vacuum(storage->path, storage->space.limit,
+                                     storage->metrics.n_max_files, s->max_retention_usec,
+                                     &s->oldest_file_usec, verbose);
+        if (r < 0 && r != -ENOENT)
+                log_warning_errno(r, "Failed to vacuum %s, ignoring: %m", storage->path);
+
+        cache_space_invalidate(&storage->space);
+}
+
+int server_vacuum(Server *s, bool verbose) {
+        assert(s);
+
+        log_debug("Vacuuming...");
+
+        s->oldest_file_usec = 0;
+
+        if (s->system_journal)
+                do_vacuum(s, &s->system_storage, verbose);
+        if (s->runtime_journal)
+                do_vacuum(s, &s->runtime_storage, verbose);
+
+        return 0;
+}
+
+static void server_cache_machine_id(Server *s) {
+        sd_id128_t id;
+        int r;
+
+        assert(s);
+
+        r = sd_id128_get_machine(&id);
+        if (r < 0)
+                return;
+
+        sd_id128_to_string(id, stpcpy(s->machine_id_field, "_MACHINE_ID="));
+}
+
+static void server_cache_boot_id(Server *s) {
+        sd_id128_t id;
+        int r;
+
+        assert(s);
+
+        r = sd_id128_get_boot(&id);
+        if (r < 0)
+                return;
+
+        sd_id128_to_string(id, stpcpy(s->boot_id_field, "_BOOT_ID="));
+}
+
+static void server_cache_hostname(Server *s) {
+        _cleanup_free_ char *t = NULL;
+        char *x;
+
+        assert(s);
+
+        t = gethostname_malloc();
+        if (!t)
+                return;
+
+        x = strjoin("_HOSTNAME=", t);
+        if (!x)
+                return;
+
+        free_and_replace(s->hostname_field, x);
+}
+
+static bool shall_try_append_again(JournalFile *f, int r) {
+        switch(r) {
+
+        case -E2BIG:           /* Hit configured limit          */
+        case -EFBIG:           /* Hit fs limit                  */
+        case -EDQUOT:          /* Quota limit hit               */
+        case -ENOSPC:          /* Disk full                     */
+                log_debug("%s: Allocation limit reached, rotating.", f->path);
+                return true;
+
+        case -EIO:             /* I/O error of some kind (mmap) */
+                log_warning("%s: IO error, rotating.", f->path);
+                return true;
+
+        case -EHOSTDOWN:       /* Other machine                 */
+                log_info("%s: Journal file from other machine, rotating.", f->path);
+                return true;
+
+        case -EBUSY:           /* Unclean shutdown              */
+                log_info("%s: Unclean shutdown, rotating.", f->path);
+                return true;
+
+        case -EPROTONOSUPPORT: /* Unsupported feature           */
+                log_info("%s: Unsupported feature, rotating.", f->path);
+                return true;
+
+        case -EBADMSG:         /* Corrupted                     */
+        case -ENODATA:         /* Truncated                     */
+        case -ESHUTDOWN:       /* Already archived              */
+                log_warning("%s: Journal file corrupted, rotating.", f->path);
+                return true;
+
+        case -EIDRM:           /* Journal file has been deleted */
+                log_warning("%s: Journal file has been deleted, rotating.", f->path);
+                return true;
+
+        case -ETXTBSY:         /* Journal file is from the future */
+                log_warning("%s: Journal file is from the future, rotating.", f->path);
+                return true;
+
+        case -EAFNOSUPPORT:
+                log_warning("%s: underlying file system does not support memory mapping or another required file system feature.", f->path);
+                return false;
+
+        default:
+                return false;
+        }
+}
+
+static void write_to_journal(Server *s, uid_t uid, struct iovec *iovec, size_t n, int priority) {
+        bool vacuumed = false, rotate = false;
+        struct dual_timestamp ts;
+        JournalFile *f;
+        int r;
+
+        assert(s);
+        assert(iovec);
+        assert(n > 0);
+
+        /* Get the closest, linearized time we have for this log event from the event loop. (Note that we do not use
+         * the source time, and not even the time the event was originally seen, but instead simply the time we started
+         * processing it, as we want strictly linear ordering in what we write out.) */
+        assert_se(sd_event_now(s->event, CLOCK_REALTIME, &ts.realtime) >= 0);
+        assert_se(sd_event_now(s->event, CLOCK_MONOTONIC, &ts.monotonic) >= 0);
+
+        if (ts.realtime < s->last_realtime_clock) {
+                /* When the time jumps backwards, let's immediately rotate. Of course, this should not happen during
+                 * regular operation. However, when it does happen, then we should make sure that we start fresh files
+                 * to ensure that the entries in the journal files are strictly ordered by time, in order to ensure
+                 * bisection works correctly. */
+
+                log_debug("Time jumped backwards, rotating.");
+                rotate = true;
+        } else {
+
+                f = find_journal(s, uid);
+                if (!f)
+                        return;
+
+                if (journal_file_rotate_suggested(f, s->max_file_usec)) {
+                        log_debug("%s: Journal header limits reached or header out-of-date, rotating.", f->path);
+                        rotate = true;
+                }
+        }
+
+        if (rotate) {
+                server_rotate(s);
+                server_vacuum(s, false);
+                vacuumed = true;
+
+                f = find_journal(s, uid);
+                if (!f)
+                        return;
+        }
+
+        s->last_realtime_clock = ts.realtime;
+
+        r = journal_file_append_entry(f, &ts, NULL, iovec, n, &s->seqnum, NULL, NULL);
+        if (r >= 0) {
+                server_schedule_sync(s, priority);
+                return;
+        }
+
+        if (vacuumed || !shall_try_append_again(f, r)) {
+                log_error_errno(r, "Failed to write entry (%zu items, %zu bytes), ignoring: %m", n, IOVEC_TOTAL_SIZE(iovec, n));
+                return;
+        }
+
+        server_rotate(s);
+        server_vacuum(s, false);
+
+        f = find_journal(s, uid);
+        if (!f)
+                return;
+
+        log_debug("Retrying write.");
+        r = journal_file_append_entry(f, &ts, NULL, iovec, n, &s->seqnum, NULL, NULL);
+        if (r < 0)
+                log_error_errno(r, "Failed to write entry (%zu items, %zu bytes) despite vacuuming, ignoring: %m", n, IOVEC_TOTAL_SIZE(iovec, n));
+        else
+                server_schedule_sync(s, priority);
+}
+
+#define IOVEC_ADD_NUMERIC_FIELD(iovec, n, value, type, isset, format, field)  \
+        if (isset(value)) {                                             \
+                char *k;                                                \
+                k = newa(char, STRLEN(field "=") + DECIMAL_STR_MAX(type) + 1); \
+                sprintf(k, field "=" format, value);                    \
+                iovec[n++] = IOVEC_MAKE_STRING(k);                      \
+        }
+
+#define IOVEC_ADD_STRING_FIELD(iovec, n, value, field)                  \
+        if (!isempty(value)) {                                          \
+                char *k;                                                \
+                k = strjoina(field "=", value);                         \
+                iovec[n++] = IOVEC_MAKE_STRING(k);                      \
+        }
+
+#define IOVEC_ADD_ID128_FIELD(iovec, n, value, field)                   \
+        if (!sd_id128_is_null(value)) {                                 \
+                char *k;                                                \
+                k = newa(char, STRLEN(field "=") + SD_ID128_STRING_MAX); \
+                sd_id128_to_string(value, stpcpy(k, field "="));        \
+                iovec[n++] = IOVEC_MAKE_STRING(k);                      \
+        }
+
+#define IOVEC_ADD_SIZED_FIELD(iovec, n, value, value_size, field)       \
+        if (value_size > 0) {                                           \
+                char *k;                                                \
+                k = newa(char, STRLEN(field "=") + value_size + 1);     \
+                *((char*) mempcpy(stpcpy(k, field "="), value, value_size)) = 0; \
+                iovec[n++] = IOVEC_MAKE_STRING(k);                      \
+        }                                                               \
+
+static void dispatch_message_real(
+                Server *s,
+                struct iovec *iovec, size_t n, size_t m,
+                const ClientContext *c,
+                const struct timeval *tv,
+                int priority,
+                pid_t object_pid) {
+
+        char source_time[sizeof("_SOURCE_REALTIME_TIMESTAMP=") + DECIMAL_STR_MAX(usec_t)];
+        _cleanup_free_ char *cmdline1 = NULL, *cmdline2 = NULL;
+        uid_t journal_uid;
+        ClientContext *o;
+
+        assert(s);
+        assert(iovec);
+        assert(n > 0);
+        assert(n +
+               N_IOVEC_META_FIELDS +
+               (pid_is_valid(object_pid) ? N_IOVEC_OBJECT_FIELDS : 0) +
+               client_context_extra_fields_n_iovec(c) <= m);
+
+        if (c) {
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, c->pid, pid_t, pid_is_valid, PID_FMT, "_PID");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, c->uid, uid_t, uid_is_valid, UID_FMT, "_UID");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, c->gid, gid_t, gid_is_valid, GID_FMT, "_GID");
+
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->comm, "_COMM"); /* At most TASK_COMM_LENGTH (16 bytes) */
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->exe, "_EXE"); /* A path, so at most PATH_MAX (4096 bytes) */
+
+                if (c->cmdline)
+                        /* At most _SC_ARG_MAX (2MB usually), which is too much to put on stack.
+                         * Let's use a heap allocation for this one. */
+                        cmdline1 = set_iovec_string_field(iovec, &n, "_CMDLINE=", c->cmdline);
+
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->capeff, "_CAP_EFFECTIVE"); /* Read from /proc/.../status */
+                IOVEC_ADD_SIZED_FIELD(iovec, n, c->label, c->label_size, "_SELINUX_CONTEXT");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, c->auditid, uint32_t, audit_session_is_valid, "%" PRIu32, "_AUDIT_SESSION");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, c->loginuid, uid_t, uid_is_valid, UID_FMT, "_AUDIT_LOGINUID");
+
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->cgroup, "_SYSTEMD_CGROUP"); /* A path */
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->session, "_SYSTEMD_SESSION");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, c->owner_uid, uid_t, uid_is_valid, UID_FMT, "_SYSTEMD_OWNER_UID");
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->unit, "_SYSTEMD_UNIT"); /* Unit names are bounded by UNIT_NAME_MAX */
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->user_unit, "_SYSTEMD_USER_UNIT");
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->slice, "_SYSTEMD_SLICE");
+                IOVEC_ADD_STRING_FIELD(iovec, n, c->user_slice, "_SYSTEMD_USER_SLICE");
+
+                IOVEC_ADD_ID128_FIELD(iovec, n, c->invocation_id, "_SYSTEMD_INVOCATION_ID");
+
+                if (c->extra_fields_n_iovec > 0) {
+                        memcpy(iovec + n, c->extra_fields_iovec, c->extra_fields_n_iovec * sizeof(struct iovec));
+                        n += c->extra_fields_n_iovec;
+                }
+        }
+
+        assert(n <= m);
+
+        if (pid_is_valid(object_pid) && client_context_get(s, object_pid, NULL, NULL, 0, NULL, &o) >= 0) {
+
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, o->pid, pid_t, pid_is_valid, PID_FMT, "OBJECT_PID");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, o->uid, uid_t, uid_is_valid, UID_FMT, "OBJECT_UID");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, o->gid, gid_t, gid_is_valid, GID_FMT, "OBJECT_GID");
+
+                /* See above for size limits, only ->cmdline may be large, so use a heap allocation for it. */
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->comm, "OBJECT_COMM");
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->exe, "OBJECT_EXE");
+                if (o->cmdline)
+                        cmdline2 = set_iovec_string_field(iovec, &n, "OBJECT_CMDLINE=", o->cmdline);
+
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->capeff, "OBJECT_CAP_EFFECTIVE");
+                IOVEC_ADD_SIZED_FIELD(iovec, n, o->label, o->label_size, "OBJECT_SELINUX_CONTEXT");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, o->auditid, uint32_t, audit_session_is_valid, "%" PRIu32, "OBJECT_AUDIT_SESSION");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, o->loginuid, uid_t, uid_is_valid, UID_FMT, "OBJECT_AUDIT_LOGINUID");
+
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->cgroup, "OBJECT_SYSTEMD_CGROUP");
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->session, "OBJECT_SYSTEMD_SESSION");
+                IOVEC_ADD_NUMERIC_FIELD(iovec, n, o->owner_uid, uid_t, uid_is_valid, UID_FMT, "OBJECT_SYSTEMD_OWNER_UID");
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->unit, "OBJECT_SYSTEMD_UNIT");
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->user_unit, "OBJECT_SYSTEMD_USER_UNIT");
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->slice, "OBJECT_SYSTEMD_SLICE");
+                IOVEC_ADD_STRING_FIELD(iovec, n, o->user_slice, "OBJECT_SYSTEMD_USER_SLICE");
+
+                IOVEC_ADD_ID128_FIELD(iovec, n, o->invocation_id, "OBJECT_SYSTEMD_INVOCATION_ID=");
+        }
+
+        assert(n <= m);
+
+        if (tv) {
+                sprintf(source_time, "_SOURCE_REALTIME_TIMESTAMP=" USEC_FMT, timeval_load(tv));
+                iovec[n++] = IOVEC_MAKE_STRING(source_time);
+        }
+
+        /* Note that strictly speaking storing the boot id here is
+         * redundant since the entry includes this in-line
+         * anyway. However, we need this indexed, too. */
+        if (!isempty(s->boot_id_field))
+                iovec[n++] = IOVEC_MAKE_STRING(s->boot_id_field);
+
+        if (!isempty(s->machine_id_field))
+                iovec[n++] = IOVEC_MAKE_STRING(s->machine_id_field);
+
+        if (!isempty(s->hostname_field))
+                iovec[n++] = IOVEC_MAKE_STRING(s->hostname_field);
+
+        if (!isempty(s->namespace_field))
+                iovec[n++] = IOVEC_MAKE_STRING(s->namespace_field);
+
+        assert(n <= m);
+
+        if (s->split_mode == SPLIT_UID && c && uid_is_valid(c->uid))
+                /* Split up strictly by (non-root) UID */
+                journal_uid = c->uid;
+        else if (s->split_mode == SPLIT_LOGIN && c && c->uid > 0 && uid_is_valid(c->owner_uid))
+                /* Split up by login UIDs.  We do this only if the
+                 * realuid is not root, in order not to accidentally
+                 * leak privileged information to the user that is
+                 * logged by a privileged process that is part of an
+                 * unprivileged session. */
+                journal_uid = c->owner_uid;
+        else
+                journal_uid = 0;
+
+        write_to_journal(s, journal_uid, iovec, n, priority);
+}
+
+void server_driver_message(Server *s, pid_t object_pid, const char *message_id, const char *format, ...) {
+
+        struct iovec *iovec;
+        size_t n = 0, k, m;
+        va_list ap;
+        int r;
+
+        assert(s);
+        assert(format);
+
+        m = N_IOVEC_META_FIELDS + 5 + N_IOVEC_PAYLOAD_FIELDS + client_context_extra_fields_n_iovec(s->my_context) + N_IOVEC_OBJECT_FIELDS;
+        iovec = newa(struct iovec, m);
+
+        assert_cc(3 == LOG_FAC(LOG_DAEMON));
+        iovec[n++] = IOVEC_MAKE_STRING("SYSLOG_FACILITY=3");
+        iovec[n++] = IOVEC_MAKE_STRING("SYSLOG_IDENTIFIER=systemd-journald");
+
+        iovec[n++] = IOVEC_MAKE_STRING("_TRANSPORT=driver");
+        assert_cc(6 == LOG_INFO);
+        iovec[n++] = IOVEC_MAKE_STRING("PRIORITY=6");
+
+        if (message_id)
+                iovec[n++] = IOVEC_MAKE_STRING(message_id);
+        k = n;
+
+        va_start(ap, format);
+        r = log_format_iovec(iovec, m, &n, false, 0, format, ap);
+        /* Error handling below */
+        va_end(ap);
+
+        if (r >= 0)
+                dispatch_message_real(s, iovec, n, m, s->my_context, NULL, LOG_INFO, object_pid);
+
+        while (k < n)
+                free(iovec[k++].iov_base);
+
+        if (r < 0) {
+                /* We failed to format the message. Emit a warning instead. */
+                char buf[LINE_MAX];
+
+                xsprintf(buf, "MESSAGE=Entry printing failed: %s", strerror_safe(r));
+
+                n = 3;
+                iovec[n++] = IOVEC_MAKE_STRING("PRIORITY=4");
+                iovec[n++] = IOVEC_MAKE_STRING(buf);
+                dispatch_message_real(s, iovec, n, m, s->my_context, NULL, LOG_INFO, object_pid);
+        }
+}
+
+void server_dispatch_message(
+                Server *s,
+                struct iovec *iovec, size_t n, size_t m,
+                ClientContext *c,
+                const struct timeval *tv,
+                int priority,
+                pid_t object_pid) {
+
+        uint64_t available = 0;
+        int rl;
+
+        assert(s);
+        assert(iovec || n == 0);
+
+        if (n == 0)
+                return;
+
+        if (LOG_PRI(priority) > s->max_level_store)
+                return;
+
+        /* Stop early in case the information will not be stored
+         * in a journal. */
+        if (s->storage == STORAGE_NONE)
+                return;
+
+        if (c && c->unit) {
+                (void) determine_space(s, &available, NULL);
+
+                rl = journal_ratelimit_test(s->ratelimit, c->unit, c->log_ratelimit_interval, c->log_ratelimit_burst, priority & LOG_PRIMASK, available);
+                if (rl == 0)
+                        return;
+
+                /* Write a suppression message if we suppressed something */
+                if (rl > 1)
+                        server_driver_message(s, c->pid,
+                                              "MESSAGE_ID=" SD_MESSAGE_JOURNAL_DROPPED_STR,
+                                              LOG_MESSAGE("Suppressed %i messages from %s", rl - 1, c->unit),
+                                              "N_DROPPED=%i", rl - 1,
+                                              NULL);
+        }
+
+        dispatch_message_real(s, iovec, n, m, c, tv, priority, object_pid);
+}
+
+int server_flush_to_var(Server *s, bool require_flag_file) {
+        char ts[FORMAT_TIMESPAN_MAX];
+        sd_journal *j = NULL;
+        const char *fn;
+        unsigned n = 0;
+        usec_t start;
+        int r, k;
+
+        assert(s);
+
+        if (!IN_SET(s->storage, STORAGE_AUTO, STORAGE_PERSISTENT))
+                return 0;
+
+        if (s->namespace) /* Flushing concept does not exist for namespace instances */
+                return 0;
+
+        if (!s->runtime_journal) /* Nothing to flush? */
+                return 0;
+
+        if (require_flag_file && !flushed_flag_is_set(s))
+                return 0;
+
+        (void) system_journal_open(s, true, false);
+
+        if (!s->system_journal)
+                return 0;
+
+        log_debug("Flushing to %s...", s->system_storage.path);
+
+        start = now(CLOCK_MONOTONIC);
+
+        r = sd_journal_open(&j, SD_JOURNAL_RUNTIME_ONLY);
+        if (r < 0)
+                return log_error_errno(r, "Failed to read runtime journal: %m");
+
+        sd_journal_set_data_threshold(j, 0);
+
+        SD_JOURNAL_FOREACH(j) {
+                Object *o = NULL;
+                JournalFile *f;
+
+                f = j->current_file;
+                assert(f && f->current_offset > 0);
+
+                n++;
+
+                r = journal_file_move_to_object(f, OBJECT_ENTRY, f->current_offset, &o);
+                if (r < 0) {
+                        log_error_errno(r, "Can't read entry: %m");
+                        goto finish;
+                }
+
+                r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset);
+                if (r >= 0)
+                        continue;
+
+                if (!shall_try_append_again(s->system_journal, r)) {
+                        log_error_errno(r, "Can't write entry: %m");
+                        goto finish;
+                }
+
+                server_rotate(s);
+                server_vacuum(s, false);
+
+                if (!s->system_journal) {
+                        log_notice("Didn't flush runtime journal since rotation of system journal wasn't successful.");
+                        r = -EIO;
+                        goto finish;
+                }
+
+                log_debug("Retrying write.");
+                r = journal_file_copy_entry(f, s->system_journal, o, f->current_offset);
+                if (r < 0) {
+                        log_error_errno(r, "Can't write entry: %m");
+                        goto finish;
+                }
+        }
+
+        r = 0;
+
+finish:
+        if (s->system_journal)
+                journal_file_post_change(s->system_journal);
+
+        s->runtime_journal = journal_file_close(s->runtime_journal);
+
+        if (r >= 0)
+                (void) rm_rf(s->runtime_storage.path, REMOVE_ROOT);
+
+        sd_journal_close(j);
+
+        server_driver_message(s, 0, NULL,
+                              LOG_MESSAGE("Time spent on flushing to %s is %s for %u entries.",
+                                          s->system_storage.path,
+                                          format_timespan(ts, sizeof(ts), now(CLOCK_MONOTONIC) - start, 0),
+                                          n),
+                              NULL);
+
+        fn = strjoina(s->runtime_directory, "/flushed");
+        k = touch(fn);
+        if (k < 0)
+                log_warning_errno(k, "Failed to touch %s, ignoring: %m", fn);
+
+        server_refresh_idle_timer(s);
+        return r;
+}
+
+static int server_relinquish_var(Server *s) {
+        const char *fn;
+        assert(s);
+
+        if (s->storage == STORAGE_NONE)
+                return 0;
+
+        if (s->namespace) /* Concept does not exist for namespaced instances */
+                return -EOPNOTSUPP;
+
+        if (s->runtime_journal && !s->system_journal)
+                return 0;
+
+        log_debug("Relinquishing %s...", s->system_storage.path);
+
+        (void) system_journal_open(s, false, true);
+
+        s->system_journal = journal_file_close(s->system_journal);
+        ordered_hashmap_clear_with_destructor(s->user_journals, journal_file_close);
+        set_clear_with_destructor(s->deferred_closes, journal_file_close);
+
+        fn = strjoina(s->runtime_directory, "/flushed");
+        if (unlink(fn) < 0 && errno != ENOENT)
+                log_warning_errno(errno, "Failed to unlink %s, ignoring: %m", fn);
+
+        server_refresh_idle_timer(s);
+        return 0;
+}
+
+int server_process_datagram(
+                sd_event_source *es,
+                int fd,
+                uint32_t revents,
+                void *userdata) {
+
+        Server *s = userdata;
+        struct ucred *ucred = NULL;
+        struct timeval *tv = NULL;
+        struct cmsghdr *cmsg;
+        char *label = NULL;
+        size_t label_len = 0, m;
+        struct iovec iovec;
+        ssize_t n;
+        int *fds = NULL, v = 0;
+        size_t n_fds = 0;
+
+        /* We use NAME_MAX space for the SELinux label here. The kernel currently enforces no limit, but
+         * according to suggestions from the SELinux people this will change and it will probably be
+         * identical to NAME_MAX. For now we use that, but this should be updated one day when the final
+         * limit is known. */
+        CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) +
+                         CMSG_SPACE(sizeof(struct timeval)) +
+                         CMSG_SPACE(sizeof(int)) + /* fd */
+                         CMSG_SPACE(NAME_MAX) /* selinux label */) control;
+
+        union sockaddr_union sa = {};
+
+        struct msghdr msghdr = {
+                .msg_iov = &iovec,
+                .msg_iovlen = 1,
+                .msg_control = &control,
+                .msg_controllen = sizeof(control),
+                .msg_name = &sa,
+                .msg_namelen = sizeof(sa),
+        };
+
+        assert(s);
+        assert(fd == s->native_fd || fd == s->syslog_fd || fd == s->audit_fd);
+
+        if (revents != EPOLLIN)
+                return log_error_errno(SYNTHETIC_ERRNO(EIO),
+                                       "Got invalid event from epoll for datagram fd: %" PRIx32,
+                                       revents);
+
+        /* Try to get the right size, if we can. (Not all sockets support SIOCINQ, hence we just try, but don't rely on
+         * it.) */
+        (void) ioctl(fd, SIOCINQ, &v);
+
+        /* Fix it up, if it is too small. We use the same fixed value as auditd here. Awful! */
+        m = PAGE_ALIGN(MAX3((size_t) v + 1,
+                            (size_t) LINE_MAX,
+                            ALIGN(sizeof(struct nlmsghdr)) + ALIGN((size_t) MAX_AUDIT_MESSAGE_LENGTH)) + 1);
+
+        if (!GREEDY_REALLOC(s->buffer, s->buffer_size, m))
+                return log_oom();
+
+        iovec = IOVEC_MAKE(s->buffer, s->buffer_size - 1); /* Leave room for trailing NUL we add later */
+
+        n = recvmsg_safe(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
+        if (IN_SET(n, -EINTR, -EAGAIN))
+                return 0;
+        if (n == -EXFULL) {
+                log_warning("Got message with truncated control data (too many fds sent?), ignoring.");
+                return 0;
+        }
+        if (n < 0)
+                return log_error_errno(n, "recvmsg() failed: %m");
+
+        CMSG_FOREACH(cmsg, &msghdr)
+                if (cmsg->cmsg_level == SOL_SOCKET &&
+                    cmsg->cmsg_type == SCM_CREDENTIALS &&
+                    cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
+                        assert(!ucred);
+                        ucred = (struct ucred*) CMSG_DATA(cmsg);
+                } else if (cmsg->cmsg_level == SOL_SOCKET &&
+                         cmsg->cmsg_type == SCM_SECURITY) {
+                        assert(!label);
+                        label = (char*) CMSG_DATA(cmsg);
+                        label_len = cmsg->cmsg_len - CMSG_LEN(0);
+                } else if (cmsg->cmsg_level == SOL_SOCKET &&
+                           cmsg->cmsg_type == SO_TIMESTAMP &&
+                           cmsg->cmsg_len == CMSG_LEN(sizeof(struct timeval))) {
+                        assert(!tv);
+                        tv = (struct timeval*) CMSG_DATA(cmsg);
+                } else if (cmsg->cmsg_level == SOL_SOCKET &&
+                         cmsg->cmsg_type == SCM_RIGHTS) {
+                        assert(!fds);
+                        fds = (int*) CMSG_DATA(cmsg);
+                        n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
+                }
+
+        /* And a trailing NUL, just in case */
+        s->buffer[n] = 0;
+
+        if (fd == s->syslog_fd) {
+                if (n > 0 && n_fds == 0)
+                        server_process_syslog_message(s, s->buffer, n, ucred, tv, label, label_len);
+                else if (n_fds > 0)
+                        log_warning("Got file descriptors via syslog socket. Ignoring.");
+
+        } else if (fd == s->native_fd) {
+                if (n > 0 && n_fds == 0)
+                        server_process_native_message(s, s->buffer, n, ucred, tv, label, label_len);
+                else if (n == 0 && n_fds == 1)
+                        server_process_native_file(s, fds[0], ucred, tv, label, label_len);
+                else if (n_fds > 0)
+                        log_warning("Got too many file descriptors via native socket. Ignoring.");
+
+        } else {
+                assert(fd == s->audit_fd);
+
+                if (n > 0 && n_fds == 0)
+                        server_process_audit_message(s, s->buffer, n, ucred, &sa, msghdr.msg_namelen);
+                else if (n_fds > 0)
+                        log_warning("Got file descriptors via audit socket. Ignoring.");
+        }
+
+        close_many(fds, n_fds);
+
+        server_refresh_idle_timer(s);
+        return 0;
+}
+
+static void server_full_flush(Server *s) {
+        assert(s);
+
+        (void) server_flush_to_var(s, false);
+        server_sync(s);
+        server_vacuum(s, false);
+
+        server_space_usage_message(s, NULL);
+
+        server_refresh_idle_timer(s);
+}
+
+static int dispatch_sigusr1(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
+        Server *s = userdata;
+
+        assert(s);
+
+        if (s->namespace) {
+                log_error("Received SIGUSR1 signal from PID " PID_FMT ", but flushing runtime journals not supported for namespaced instances.", si->ssi_pid);
+                return 0;
+        }
+
+        log_info("Received SIGUSR1 signal from PID " PID_FMT ", as request to flush runtime journal.", si->ssi_pid);
+        server_full_flush(s);
+
+        return 0;
+}
+
+static void server_full_rotate(Server *s) {
+        const char *fn;
+        int r;
+
+        assert(s);
+
+        server_rotate(s);
+        server_vacuum(s, true);
+
+        if (s->system_journal)
+                patch_min_use(&s->system_storage);
+        if (s->runtime_journal)
+                patch_min_use(&s->runtime_storage);
+
+        /* Let clients know when the most recent rotation happened. */
+        fn = strjoina(s->runtime_directory, "/rotated");
+        r = write_timestamp_file_atomic(fn, now(CLOCK_MONOTONIC));
+        if (r < 0)
+                log_warning_errno(r, "Failed to write %s, ignoring: %m", fn);
+}
+
+static int dispatch_sigusr2(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
+        Server *s = userdata;
+
+        assert(s);
+
+        log_info("Received SIGUSR2 signal from PID " PID_FMT ", as request to rotate journal.", si->ssi_pid);
+        server_full_rotate(s);
+
+        return 0;
+}
+
+static int dispatch_sigterm(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
+        Server *s = userdata;
+
+        assert(s);
+
+        log_received_signal(LOG_INFO, si);
+
+        sd_event_exit(s->event, 0);
+        return 0;
+}
+
+static void server_full_sync(Server *s) {
+        const char *fn;
+        int r;
+
+        assert(s);
+
+        server_sync(s);
+
+        /* Let clients know when the most recent sync happened. */
+        fn = strjoina(s->runtime_directory, "/synced");
+        r = write_timestamp_file_atomic(fn, now(CLOCK_MONOTONIC));
+        if (r < 0)
+                log_warning_errno(r, "Failed to write %s, ignoring: %m", fn);
+
+        return;
+}
+
+static int dispatch_sigrtmin1(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
+        Server *s = userdata;
+
+        assert(s);
+
+        log_debug("Received SIGRTMIN1 signal from PID " PID_FMT ", as request to sync.", si->ssi_pid );
+        server_full_sync(s);
+
+        return 0;
+}
+
+static int setup_signals(Server *s) {
+        int r;
+
+        assert(s);
+
+        assert_se(sigprocmask_many(SIG_SETMASK, NULL, SIGINT, SIGTERM, SIGUSR1, SIGUSR2, SIGRTMIN+1, -1) >= 0);
+
+        r = sd_event_add_signal(s->event, &s->sigusr1_event_source, SIGUSR1, dispatch_sigusr1, s);
+        if (r < 0)
+                return r;
+
+        r = sd_event_add_signal(s->event, &s->sigusr2_event_source, SIGUSR2, dispatch_sigusr2, s);
+        if (r < 0)
+                return r;
+
+        r = sd_event_add_signal(s->event, &s->sigterm_event_source, SIGTERM, dispatch_sigterm, s);
+        if (r < 0)
+                return r;
+
+        /* Let's process SIGTERM late, so that we flush all queued messages to disk before we exit */
+        r = sd_event_source_set_priority(s->sigterm_event_source, SD_EVENT_PRIORITY_NORMAL+20);
+        if (r < 0)
+                return r;
+
+        /* When journald is invoked on the terminal (when debugging), it's useful if C-c is handled
+         * equivalent to SIGTERM. */
+        r = sd_event_add_signal(s->event, &s->sigint_event_source, SIGINT, dispatch_sigterm, s);
+        if (r < 0)
+                return r;
+
+        r = sd_event_source_set_priority(s->sigint_event_source, SD_EVENT_PRIORITY_NORMAL+20);
+        if (r < 0)
+                return r;
+
+        /* SIGRTMIN+1 causes an immediate sync. We process this very late, so that everything else queued at
+         * this point is really written to disk. Clients can watch /run/systemd/journal/synced with inotify
+         * until its mtime changes to see when a sync happened. */
+        r = sd_event_add_signal(s->event, &s->sigrtmin1_event_source, SIGRTMIN+1, dispatch_sigrtmin1, s);
+        if (r < 0)
+                return r;
+
+        r = sd_event_source_set_priority(s->sigrtmin1_event_source, SD_EVENT_PRIORITY_NORMAL+15);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
+        Server *s = data;
+        int r;
+
+        assert(s);
+
+        if (proc_cmdline_key_streq(key, "systemd.journald.forward_to_syslog")) {
+
+                r = value ? parse_boolean(value) : true;
+                if (r < 0)
+                        log_warning("Failed to parse forward to syslog switch \"%s\". Ignoring.", value);
+                else
+                        s->forward_to_syslog = r;
+
+        } else if (proc_cmdline_key_streq(key, "systemd.journald.forward_to_kmsg")) {
+
+                r = value ? parse_boolean(value) : true;
+                if (r < 0)
+                        log_warning("Failed to parse forward to kmsg switch \"%s\". Ignoring.", value);
+                else
+                        s->forward_to_kmsg = r;
+
+        } else if (proc_cmdline_key_streq(key, "systemd.journald.forward_to_console")) {
+
+                r = value ? parse_boolean(value) : true;
+                if (r < 0)
+                        log_warning("Failed to parse forward to console switch \"%s\". Ignoring.", value);
+                else
+                        s->forward_to_console = r;
+
+        } else if (proc_cmdline_key_streq(key, "systemd.journald.forward_to_wall")) {
+
+                r = value ? parse_boolean(value) : true;
+                if (r < 0)
+                        log_warning("Failed to parse forward to wall switch \"%s\". Ignoring.", value);
+                else
+                        s->forward_to_wall = r;
+
+        } else if (proc_cmdline_key_streq(key, "systemd.journald.max_level_console")) {
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level console value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_console = r;
+
+        } else if (proc_cmdline_key_streq(key, "systemd.journald.max_level_store")) {
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level store value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_store = r;
+
+        } else if (proc_cmdline_key_streq(key, "systemd.journald.max_level_syslog")) {
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level syslog value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_syslog = r;
+
+        } else if (proc_cmdline_key_streq(key, "systemd.journald.max_level_kmsg")) {
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level kmsg value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_kmsg = r;
+
+        } else if (proc_cmdline_key_streq(key, "systemd.journald.max_level_wall")) {
+
+                if (proc_cmdline_value_missing(key, value))
+                        return 0;
+
+                r = log_level_from_string(value);
+                if (r < 0)
+                        log_warning("Failed to parse max level wall value \"%s\". Ignoring.", value);
+                else
+                        s->max_level_wall = r;
+
+        } else if (startswith(key, "systemd.journald"))
+                log_warning("Unknown journald kernel command line option \"%s\". Ignoring.", key);
+
+        /* do not warn about state here, since probably systemd already did */
+        return 0;
+}
+
+static int server_parse_config_file(Server *s) {
+        int r;
+
+        assert(s);
+
+        if (s->namespace) {
+                const char *namespaced;
+
+                /* If we are running in namespace mode, load the namespace specific configuration file, and nothing else */
+                namespaced = strjoina(PKGSYSCONFDIR "/journald@", s->namespace, ".conf");
+
+                r = config_parse(NULL,
+                                 namespaced, NULL,
+                                 "Journal\0",
+                                 config_item_perf_lookup, journald_gperf_lookup,
+                                 CONFIG_PARSE_WARN, s,
+                                 NULL);
+                if (r < 0)
+                        return r;
+
+                return 0;
+        }
+
+        return config_parse_many_nulstr(
+                        PKGSYSCONFDIR "/journald.conf",
+                        CONF_PATHS_NULSTR("systemd/journald.conf.d"),
+                        "Journal\0",
+                        config_item_perf_lookup, journald_gperf_lookup,
+                        CONFIG_PARSE_WARN, s, NULL);
+}
+
+static int server_dispatch_sync(sd_event_source *es, usec_t t, void *userdata) {
+        Server *s = userdata;
+
+        assert(s);
+
+        server_sync(s);
+        return 0;
+}
+
+int server_schedule_sync(Server *s, int priority) {
+        int r;
+
+        assert(s);
+
+        if (priority <= LOG_CRIT) {
+                /* Immediately sync to disk when this is of priority CRIT, ALERT, EMERG */
+                server_sync(s);
+                return 0;
+        }
+
+        if (s->sync_scheduled)
+                return 0;
+
+        if (s->sync_interval_usec > 0) {
+
+                if (!s->sync_event_source) {
+                        r = sd_event_add_time_relative(
+                                        s->event,
+                                        &s->sync_event_source,
+                                        CLOCK_MONOTONIC,
+                                        s->sync_interval_usec, 0,
+                                        server_dispatch_sync, s);
+                        if (r < 0)
+                                return r;
+
+                        r = sd_event_source_set_priority(s->sync_event_source, SD_EVENT_PRIORITY_IMPORTANT);
+                } else {
+                        r = sd_event_source_set_time_relative(s->sync_event_source, s->sync_interval_usec);
+                        if (r < 0)
+                                return r;
+
+                        r = sd_event_source_set_enabled(s->sync_event_source, SD_EVENT_ONESHOT);
+                }
+                if (r < 0)
+                        return r;
+
+                s->sync_scheduled = true;
+        }
+
+        return 0;
+}
+
+static int dispatch_hostname_change(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
+        Server *s = userdata;
+
+        assert(s);
+
+        server_cache_hostname(s);
+        return 0;
+}
+
+static int server_open_hostname(Server *s) {
+        int r;
+
+        assert(s);
+
+        s->hostname_fd = open("/proc/sys/kernel/hostname",
+                              O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
+        if (s->hostname_fd < 0)
+                return log_error_errno(errno, "Failed to open /proc/sys/kernel/hostname: %m");
+
+        r = sd_event_add_io(s->event, &s->hostname_event_source, s->hostname_fd, 0, dispatch_hostname_change, s);
+        if (r < 0) {
+                /* kernels prior to 3.2 don't support polling this file. Ignore
+                 * the failure. */
+                if (r == -EPERM) {
+                        log_warning_errno(r, "Failed to register hostname fd in event loop, ignoring: %m");
+                        s->hostname_fd = safe_close(s->hostname_fd);
+                        return 0;
+                }
+
+                return log_error_errno(r, "Failed to register hostname fd in event loop: %m");
+        }
+
+        r = sd_event_source_set_priority(s->hostname_event_source, SD_EVENT_PRIORITY_IMPORTANT-10);
+        if (r < 0)
+                return log_error_errno(r, "Failed to adjust priority of hostname event source: %m");
+
+        return 0;
+}
+
+static int dispatch_notify_event(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
+        Server *s = userdata;
+        int r;
+
+        assert(s);
+        assert(s->notify_event_source == es);
+        assert(s->notify_fd == fd);
+
+        /* The $NOTIFY_SOCKET is writable again, now send exactly one
+         * message on it. Either it's the watchdog event, the initial
+         * READY=1 event or an stdout stream event. If there's nothing
+         * to write anymore, turn our event source off. The next time
+         * there's something to send it will be turned on again. */
+
+        if (!s->sent_notify_ready) {
+                static const char p[] =
+                        "READY=1\n"
+                        "STATUS=Processing requests...";
+                ssize_t l;
+
+                l = send(s->notify_fd, p, strlen(p), MSG_DONTWAIT);
+                if (l < 0) {
+                        if (errno == EAGAIN)
+                                return 0;
+
+                        return log_error_errno(errno, "Failed to send READY=1 notification message: %m");
+                }
+
+                s->sent_notify_ready = true;
+                log_debug("Sent READY=1 notification.");
+
+        } else if (s->send_watchdog) {
+
+                static const char p[] =
+                        "WATCHDOG=1";
+
+                ssize_t l;
+
+                l = send(s->notify_fd, p, strlen(p), MSG_DONTWAIT);
+                if (l < 0) {
+                        if (errno == EAGAIN)
+                                return 0;
+
+                        return log_error_errno(errno, "Failed to send WATCHDOG=1 notification message: %m");
+                }
+
+                s->send_watchdog = false;
+                log_debug("Sent WATCHDOG=1 notification.");
+
+        } else if (s->stdout_streams_notify_queue)
+                /* Dispatch one stream notification event */
+                stdout_stream_send_notify(s->stdout_streams_notify_queue);
+
+        /* Leave us enabled if there's still more to do. */
+        if (s->send_watchdog || s->stdout_streams_notify_queue)
+                return 0;
+
+        /* There was nothing to do anymore, let's turn ourselves off. */
+        r = sd_event_source_set_enabled(es, SD_EVENT_OFF);
+        if (r < 0)
+                return log_error_errno(r, "Failed to turn off notify event source: %m");
+
+        return 0;
+}
+
+static int dispatch_watchdog(sd_event_source *es, uint64_t usec, void *userdata) {
+        Server *s = userdata;
+        int r;
+
+        assert(s);
+
+        s->send_watchdog = true;
+
+        r = sd_event_source_set_enabled(s->notify_event_source, SD_EVENT_ON);
+        if (r < 0)
+                log_warning_errno(r, "Failed to turn on notify event source: %m");
+
+        r = sd_event_source_set_time(s->watchdog_event_source, usec + s->watchdog_usec / 2);
+        if (r < 0)
+                return log_error_errno(r, "Failed to restart watchdog event source: %m");
+
+        r = sd_event_source_set_enabled(s->watchdog_event_source, SD_EVENT_ON);
+        if (r < 0)
+                return log_error_errno(r, "Failed to enable watchdog event source: %m");
+
+        return 0;
+}
+
+static int server_connect_notify(Server *s) {
+        union sockaddr_union sa;
+        socklen_t sa_len;
+        const char *e;
+        int r;
+
+        assert(s);
+        assert(s->notify_fd < 0);
+        assert(!s->notify_event_source);
+
+        /*
+         * So here's the problem: we'd like to send notification messages to PID 1, but we cannot do that via
+         * sd_notify(), since that's synchronous, and we might end up blocking on it. Specifically: given
+         * that PID 1 might block on dbus-daemon during IPC, and dbus-daemon is logging to us, and might
+         * hence block on us, we might end up in a deadlock if we block on sending PID 1 notification
+         * messages — by generating a full blocking circle. To avoid this, let's create a non-blocking
+         * socket, and connect it to the notification socket, and then wait for POLLOUT before we send
+         * anything. This should efficiently avoid any deadlocks, as we'll never block on PID 1, hence PID 1
+         * can safely block on dbus-daemon which can safely block on us again.
+         *
+         * Don't think that this issue is real? It is, see: https://github.com/systemd/systemd/issues/1505
+         */
+
+        e = getenv("NOTIFY_SOCKET");
+        if (!e)
+                return 0;
+
+        r = sockaddr_un_set_path(&sa.un, e);
+        if (r < 0)
+                return log_error_errno(r, "NOTIFY_SOCKET set to invalid value '%s': %m", e);
+        sa_len = r;
+
+        s->notify_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+        if (s->notify_fd < 0)
+                return log_error_errno(errno, "Failed to create notify socket: %m");
+
+        (void) fd_inc_sndbuf(s->notify_fd, NOTIFY_SNDBUF_SIZE);
+
+        r = connect(s->notify_fd, &sa.sa, sa_len);
+        if (r < 0)
+                return log_error_errno(errno, "Failed to connect to notify socket: %m");
+
+        r = sd_event_add_io(s->event, &s->notify_event_source, s->notify_fd, EPOLLOUT, dispatch_notify_event, s);
+        if (r < 0)
+                return log_error_errno(r, "Failed to watch notification socket: %m");
+
+        if (sd_watchdog_enabled(false, &s->watchdog_usec) > 0) {
+                s->send_watchdog = true;
+
+                r = sd_event_add_time_relative(s->event, &s->watchdog_event_source, CLOCK_MONOTONIC, s->watchdog_usec/2, s->watchdog_usec/4, dispatch_watchdog, s);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to add watchdog time event: %m");
+        }
+
+        /* This should fire pretty soon, which we'll use to send the READY=1 event. */
+
+        return 0;
+}
+
+static int synchronize_second_half(sd_event_source *event_source, void *userdata) {
+        Varlink *link = userdata;
+        Server *s;
+        int r;
+
+        assert(link);
+        assert_se(s = varlink_get_userdata(link));
+
+        /* This is the "second half" of the Synchronize() varlink method. This function is called as deferred
+         * event source at a low priority to ensure the synchronization completes after all queued log
+         * messages are processed. */
+        server_full_sync(s);
+
+        /* Let's get rid of the event source now, by marking it as non-floating again. It then has no ref
+         * anymore and is immediately destroyed after we return from this function, i.e. from this event
+         * source handler at the end. */
+        r = sd_event_source_set_floating(event_source, false);
+        if (r < 0)
+                return log_error_errno(r, "Failed to mark event source as non-floating: %m");
+
+        return varlink_reply(link, NULL);
+}
+
+static void synchronize_destroy(void *userdata) {
+        varlink_unref(userdata);
+}
+
+static int vl_method_synchronize(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        _cleanup_(sd_event_source_unrefp) sd_event_source *event_source = NULL;
+        Server *s = userdata;
+        int r;
+
+        assert(link);
+        assert(s);
+
+        if (json_variant_elements(parameters) > 0)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        log_info("Received client request to rotate journal.");
+
+        /* We don't do the main work now, but instead enqueue a deferred event loop job which will do
+         * it. That job is scheduled at low priority, so that we return from this method call only after all
+         * queued but not processed log messages are written to disk, so that this method call returning can
+         * be used as nice synchronization point. */
+        r = sd_event_add_defer(s->event, &event_source, synchronize_second_half, link);
+        if (r < 0)
+                return log_error_errno(r, "Failed to allocate defer event source: %m");
+
+        r = sd_event_source_set_destroy_callback(event_source, synchronize_destroy);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set event source destroy callback: %m");
+
+        varlink_ref(link); /* The varlink object is now left to the destroy callback to unref */
+
+        r = sd_event_source_set_priority(event_source, SD_EVENT_PRIORITY_NORMAL+15);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set defer event source priority: %m");
+
+        /* Give up ownership of this event source. It will now be destroyed along with event loop itself,
+         * unless it destroys itself earlier. */
+        r = sd_event_source_set_floating(event_source, true);
+        if (r < 0)
+                return log_error_errno(r, "Failed to mark event source as floating: %m");
+
+        (void) sd_event_source_set_description(event_source, "deferred-sync");
+
+        return 0;
+}
+
+static int vl_method_rotate(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        Server *s = userdata;
+
+        assert(link);
+        assert(s);
+
+        if (json_variant_elements(parameters) > 0)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        log_info("Received client request to rotate journal.");
+        server_full_rotate(s);
+
+        return varlink_reply(link, NULL);
+}
+
+static int vl_method_flush_to_var(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        Server *s = userdata;
+
+        assert(link);
+        assert(s);
+
+        if (json_variant_elements(parameters) > 0)
+                return varlink_error_invalid_parameter(link, parameters);
+        if (s->namespace)
+                return varlink_error(link, "io.systemd.Journal.NotSupportedByNamespaces", NULL);
+
+        log_info("Received client request to flush runtime journal.");
+        server_full_flush(s);
+
+        return varlink_reply(link, NULL);
+}
+
+static int vl_method_relinquish_var(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        Server *s = userdata;
+
+        assert(link);
+        assert(s);
+
+        if (json_variant_elements(parameters) > 0)
+                return varlink_error_invalid_parameter(link, parameters);
+        if (s->namespace)
+                return varlink_error(link, "io.systemd.Journal.NotSupportedByNamespaces", NULL);
+
+        log_info("Received client request to relinquish %s access.", s->system_storage.path);
+        server_relinquish_var(s);
+
+        return varlink_reply(link, NULL);
+}
+
+static int vl_connect(VarlinkServer *server, Varlink *link, void *userdata) {
+        Server *s = userdata;
+
+        assert(server);
+        assert(link);
+        assert(s);
+
+        (void) server_start_or_stop_idle_timer(s); /* maybe we are no longer idle */
+
+        return 0;
+}
+
+static void vl_disconnect(VarlinkServer *server, Varlink *link, void *userdata) {
+        Server *s = userdata;
+
+        assert(server);
+        assert(link);
+        assert(s);
+
+        (void) server_start_or_stop_idle_timer(s); /* maybe we are idle now */
+}
+
+static int server_open_varlink(Server *s, const char *socket, int fd) {
+        int r;
+
+        assert(s);
+
+        r = varlink_server_new(&s->varlink_server, VARLINK_SERVER_ROOT_ONLY);
+        if (r < 0)
+                return r;
+
+        varlink_server_set_userdata(s->varlink_server, s);
+
+        r = varlink_server_bind_method_many(
+                        s->varlink_server,
+                        "io.systemd.Journal.Synchronize",   vl_method_synchronize,
+                        "io.systemd.Journal.Rotate",        vl_method_rotate,
+                        "io.systemd.Journal.FlushToVar",    vl_method_flush_to_var,
+                        "io.systemd.Journal.RelinquishVar", vl_method_relinquish_var);
+        if (r < 0)
+                return r;
+
+        r = varlink_server_bind_connect(s->varlink_server, vl_connect);
+        if (r < 0)
+                return r;
+
+        r = varlink_server_bind_disconnect(s->varlink_server, vl_disconnect);
+        if (r < 0)
+                return r;
+
+        if (fd < 0)
+                r = varlink_server_listen_address(s->varlink_server, socket, 0600);
+        else
+                r = varlink_server_listen_fd(s->varlink_server, fd);
+        if (r < 0)
+                return r;
+
+        r = varlink_server_attach_event(s->varlink_server, s->event, SD_EVENT_PRIORITY_NORMAL);
+        if (r < 0)
+                return r;
+
+        return 0;
+}
+
+static bool server_is_idle(Server *s) {
+        assert(s);
+
+        /* The server for the main namespace is never idle */
+        if (!s->namespace)
+                return false;
+
+        /* If a retention maximum is set larger than the idle time we need to be running to enforce it, hence
+         * turn off the idle logic. */
+        if (s->max_retention_usec > IDLE_TIMEOUT_USEC)
+                return false;
+
+        /* We aren't idle if we have a varlink client */
+        if (varlink_server_current_connections(s->varlink_server) > 0)
+                return false;
+
+        /* If we have stdout streams we aren't idle */
+        if (s->n_stdout_streams > 0)
+                return false;
+
+        return true;
+}
+
+static int server_idle_handler(sd_event_source *source, uint64_t usec, void *userdata) {
+        Server *s = userdata;
+
+        assert(source);
+        assert(s);
+
+        log_debug("Server is idle, exiting.");
+        sd_event_exit(s->event, 0);
+        return 0;
+}
+
+int server_start_or_stop_idle_timer(Server *s) {
+        _cleanup_(sd_event_source_unrefp) sd_event_source *source = NULL;
+        int r;
+
+        assert(s);
+
+        if (!server_is_idle(s)) {
+                s->idle_event_source = sd_event_source_disable_unref(s->idle_event_source);
+                return 0;
+        }
+
+        if (s->idle_event_source)
+                return 1;
+
+        r = sd_event_add_time_relative(s->event, &source, CLOCK_MONOTONIC, IDLE_TIMEOUT_USEC, 0, server_idle_handler, s);
+        if (r < 0)
+                return log_error_errno(r, "Failed to allocate idle timer: %m");
+
+        r = sd_event_source_set_priority(source, SD_EVENT_PRIORITY_IDLE);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set idle timer priority: %m");
+
+        (void) sd_event_source_set_description(source, "idle-timer");
+
+        s->idle_event_source = TAKE_PTR(source);
+        return 1;
+}
+
+int server_refresh_idle_timer(Server *s) {
+        int r;
+
+        assert(s);
+
+        if (!s->idle_event_source)
+                return 0;
+
+        r = sd_event_source_set_time_relative(s->idle_event_source, IDLE_TIMEOUT_USEC);
+        if (r < 0)
+                return log_error_errno(r, "Failed to refresh idle timer: %m");
+
+        return 1;
+}
+
+static int set_namespace(Server *s, const char *namespace) {
+        assert(s);
+
+        if (!namespace)
+                return 0;
+
+        if (!log_namespace_name_valid(namespace))
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Specified namespace name not valid, refusing: %s", namespace);
+
+        s->namespace = strdup(namespace);
+        if (!s->namespace)
+                return log_oom();
+
+        s->namespace_field = strjoin("_NAMESPACE=", namespace);
+        if (!s->namespace_field)
+                return log_oom();
+
+        return 1;
+}
+
+int server_init(Server *s, const char *namespace) {
+        const char *native_socket, *syslog_socket, *stdout_socket, *varlink_socket, *e;
+        _cleanup_fdset_free_ FDSet *fds = NULL;
+        int n, r, fd, varlink_fd = -1;
+        bool no_sockets;
+
+        assert(s);
+
+        *s = (Server) {
+                .syslog_fd = -1,
+                .native_fd = -1,
+                .stdout_fd = -1,
+                .dev_kmsg_fd = -1,
+                .audit_fd = -1,
+                .hostname_fd = -1,
+                .notify_fd = -1,
+
+                .compress.enabled = true,
+                .compress.threshold_bytes = (uint64_t) -1,
+                .seal = true,
+
+                .set_audit = true,
+
+                .watchdog_usec = USEC_INFINITY,
+
+                .sync_interval_usec = DEFAULT_SYNC_INTERVAL_USEC,
+                .sync_scheduled = false,
+
+                .ratelimit_interval = DEFAULT_RATE_LIMIT_INTERVAL,
+                .ratelimit_burst = DEFAULT_RATE_LIMIT_BURST,
+
+                .forward_to_wall = true,
+
+                .max_file_usec = DEFAULT_MAX_FILE_USEC,
+
+                .max_level_store = LOG_DEBUG,
+                .max_level_syslog = LOG_DEBUG,
+                .max_level_kmsg = LOG_NOTICE,
+                .max_level_console = LOG_INFO,
+                .max_level_wall = LOG_EMERG,
+
+                .line_max = DEFAULT_LINE_MAX,
+
+                .runtime_storage.name = "Runtime Journal",
+                .system_storage.name = "System Journal",
+        };
+
+        r = set_namespace(s, namespace);
+        if (r < 0)
+                return r;
+
+        /* By default, only read from /dev/kmsg if are the main namespace */
+        s->read_kmsg = !s->namespace;
+        s->storage = s->namespace ? STORAGE_PERSISTENT : STORAGE_AUTO;
+
+        journal_reset_metrics(&s->system_storage.metrics);
+        journal_reset_metrics(&s->runtime_storage.metrics);
+
+        server_parse_config_file(s);
+
+        if (!s->namespace) {
+                /* Parse kernel command line, but only if we are not a namespace instance */
+                r = proc_cmdline_parse(parse_proc_cmdline_item, s, PROC_CMDLINE_STRIP_RD_PREFIX);
+                if (r < 0)
+                        log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+        }
+
+        if (!!s->ratelimit_interval != !!s->ratelimit_burst) { /* One set to 0 and the other not? */
+                log_debug("Setting both rate limit interval and burst from "USEC_FMT",%u to 0,0",
+                          s->ratelimit_interval, s->ratelimit_burst);
+                s->ratelimit_interval = s->ratelimit_burst = 0;
+        }
+
+        e = getenv("RUNTIME_DIRECTORY");
+        if (e)
+                s->runtime_directory = strdup(e);
+        else if (s->namespace)
+                s->runtime_directory = strjoin("/run/systemd/journal.", s->namespace);
+        else
+                s->runtime_directory = strdup("/run/systemd/journal");
+        if (!s->runtime_directory)
+                return log_oom();
+
+        (void) mkdir_p(s->runtime_directory, 0755);
+
+        s->user_journals = ordered_hashmap_new(NULL);
+        if (!s->user_journals)
+                return log_oom();
+
+        s->mmap = mmap_cache_new();
+        if (!s->mmap)
+                return log_oom();
+
+        s->deferred_closes = set_new(NULL);
+        if (!s->deferred_closes)
+                return log_oom();
+
+        r = sd_event_default(&s->event);
+        if (r < 0)
+                return log_error_errno(r, "Failed to create event loop: %m");
+
+        n = sd_listen_fds(true);
+        if (n < 0)
+                return log_error_errno(n, "Failed to read listening file descriptors from environment: %m");
+
+        native_socket = strjoina(s->runtime_directory, "/socket");
+        stdout_socket = strjoina(s->runtime_directory, "/stdout");
+        syslog_socket = strjoina(s->runtime_directory, "/dev-log");
+        varlink_socket = strjoina(s->runtime_directory, "/io.systemd.journal");
+
+        for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) {
+
+                if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, native_socket, 0) > 0) {
+
+                        if (s->native_fd >= 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Too many native sockets passed.");
+
+                        s->native_fd = fd;
+
+                } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, stdout_socket, 0) > 0) {
+
+                        if (s->stdout_fd >= 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Too many stdout sockets passed.");
+
+                        s->stdout_fd = fd;
+
+                } else if (sd_is_socket_unix(fd, SOCK_DGRAM, -1, syslog_socket, 0) > 0) {
+
+                        if (s->syslog_fd >= 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Too many /dev/log sockets passed.");
+
+                        s->syslog_fd = fd;
+
+                } else if (sd_is_socket_unix(fd, SOCK_STREAM, 1, varlink_socket, 0) > 0) {
+
+                        if (varlink_fd >= 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Too many varlink sockets passed.");
+
+                        varlink_fd = fd;
+                } else if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1) > 0) {
+
+                        if (s->audit_fd >= 0)
+                                return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                                       "Too many audit sockets passed.");
+
+                        s->audit_fd = fd;
+
+                } else {
+
+                        if (!fds) {
+                                fds = fdset_new();
+                                if (!fds)
+                                        return log_oom();
+                        }
+
+                        r = fdset_put(fds, fd);
+                        if (r < 0)
+                                return log_oom();
+                }
+        }
+
+        /* Try to restore streams, but don't bother if this fails */
+        (void) server_restore_streams(s, fds);
+
+        if (fdset_size(fds) > 0) {
+                log_warning("%u unknown file descriptors passed, closing.", fdset_size(fds));
+                fds = fdset_free(fds);
+        }
+
+        no_sockets = s->native_fd < 0 && s->stdout_fd < 0 && s->syslog_fd < 0 && s->audit_fd < 0 && varlink_fd < 0;
+
+        /* always open stdout, syslog, native, and kmsg sockets */
+
+        /* systemd-journald.socket: /run/systemd/journal/stdout */
+        r = server_open_stdout_socket(s, stdout_socket);
+        if (r < 0)
+                return r;
+
+        /* systemd-journald-dev-log.socket: /run/systemd/journal/dev-log */
+        r = server_open_syslog_socket(s, syslog_socket);
+        if (r < 0)
+                return r;
+
+        /* systemd-journald.socket: /run/systemd/journal/socket */
+        r = server_open_native_socket(s, native_socket);
+        if (r < 0)
+                return r;
+
+        /* /dev/kmsg */
+        r = server_open_dev_kmsg(s);
+        if (r < 0)
+                return r;
+
+        /* Unless we got *some* sockets and not audit, open audit socket */
+        if (s->audit_fd >= 0 || no_sockets) {
+                r = server_open_audit(s);
+                if (r < 0)
+                        return r;
+        }
+
+        r = server_open_varlink(s, varlink_socket, varlink_fd);
+        if (r < 0)
+                return r;
+
+        r = server_open_kernel_seqnum(s);
+        if (r < 0)
+                return r;
+
+        r = server_open_hostname(s);
+        if (r < 0)
+                return r;
+
+        r = setup_signals(s);
+        if (r < 0)
+                return r;
+
+        s->ratelimit = journal_ratelimit_new();
+        if (!s->ratelimit)
+                return log_oom();
+
+        r = cg_get_root_path(&s->cgroup_root);
+        if (r < 0)
+                return log_error_errno(r, "Failed to acquire cgroup root path: %m");
+
+        server_cache_hostname(s);
+        server_cache_boot_id(s);
+        server_cache_machine_id(s);
+
+        if (s->namespace)
+                s->runtime_storage.path = strjoin("/run/log/journal/", SERVER_MACHINE_ID(s), ".", s->namespace);
+        else
+                s->runtime_storage.path = strjoin("/run/log/journal/", SERVER_MACHINE_ID(s));
+        if (!s->runtime_storage.path)
+                return log_oom();
+
+        e = getenv("LOGS_DIRECTORY");
+        if (e)
+                s->system_storage.path = strdup(e);
+        else if (s->namespace)
+                s->system_storage.path = strjoin("/var/log/journal/", SERVER_MACHINE_ID(s), ".", s->namespace);
+        else
+                s->system_storage.path = strjoin("/var/log/journal/", SERVER_MACHINE_ID(s));
+        if (!s->system_storage.path)
+                return log_oom();
+
+        (void) server_connect_notify(s);
+
+        (void) client_context_acquire_default(s);
+
+        r = system_journal_open(s, false, false);
+        if (r < 0)
+                return r;
+
+        server_start_or_stop_idle_timer(s);
+        return 0;
+}
+
+void server_maybe_append_tags(Server *s) {
+#if HAVE_GCRYPT
+        JournalFile *f;
+        usec_t n;
+
+        n = now(CLOCK_REALTIME);
+
+        if (s->system_journal)
+                journal_file_maybe_append_tag(s->system_journal, n);
+
+        ORDERED_HASHMAP_FOREACH(f, s->user_journals)
+                journal_file_maybe_append_tag(f, n);
+#endif
+}
+
+void server_done(Server *s) {
+        assert(s);
+
+        free(s->namespace);
+        free(s->namespace_field);
+
+        set_free_with_destructor(s->deferred_closes, journal_file_close);
+
+        while (s->stdout_streams)
+                stdout_stream_free(s->stdout_streams);
+
+        client_context_flush_all(s);
+
+        (void) journal_file_close(s->system_journal);
+        (void) journal_file_close(s->runtime_journal);
+
+        ordered_hashmap_free_with_destructor(s->user_journals, journal_file_close);
+
+        varlink_server_unref(s->varlink_server);
+
+        sd_event_source_unref(s->syslog_event_source);
+        sd_event_source_unref(s->native_event_source);
+        sd_event_source_unref(s->stdout_event_source);
+        sd_event_source_unref(s->dev_kmsg_event_source);
+        sd_event_source_unref(s->audit_event_source);
+        sd_event_source_unref(s->sync_event_source);
+        sd_event_source_unref(s->sigusr1_event_source);
+        sd_event_source_unref(s->sigusr2_event_source);
+        sd_event_source_unref(s->sigterm_event_source);
+        sd_event_source_unref(s->sigint_event_source);
+        sd_event_source_unref(s->sigrtmin1_event_source);
+        sd_event_source_unref(s->hostname_event_source);
+        sd_event_source_unref(s->notify_event_source);
+        sd_event_source_unref(s->watchdog_event_source);
+        sd_event_source_unref(s->idle_event_source);
+        sd_event_unref(s->event);
+
+        safe_close(s->syslog_fd);
+        safe_close(s->native_fd);
+        safe_close(s->stdout_fd);
+        safe_close(s->dev_kmsg_fd);
+        safe_close(s->audit_fd);
+        safe_close(s->hostname_fd);
+        safe_close(s->notify_fd);
+
+        if (s->ratelimit)
+                journal_ratelimit_free(s->ratelimit);
+
+        if (s->kernel_seqnum)
+                munmap(s->kernel_seqnum, sizeof(uint64_t));
+
+        free(s->buffer);
+        free(s->tty_path);
+        free(s->cgroup_root);
+        free(s->hostname_field);
+        free(s->runtime_storage.path);
+        free(s->system_storage.path);
+        free(s->runtime_directory);
+
+        mmap_cache_unref(s->mmap);
+}
+
+static const char* const storage_table[_STORAGE_MAX] = {
+        [STORAGE_AUTO] = "auto",
+        [STORAGE_VOLATILE] = "volatile",
+        [STORAGE_PERSISTENT] = "persistent",
+        [STORAGE_NONE] = "none"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(storage, Storage);
+DEFINE_CONFIG_PARSE_ENUM(config_parse_storage, storage, Storage, "Failed to parse storage setting");
+
+static const char* const split_mode_table[_SPLIT_MAX] = {
+        [SPLIT_LOGIN] = "login",
+        [SPLIT_UID] = "uid",
+        [SPLIT_NONE] = "none",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(split_mode, SplitMode);
+DEFINE_CONFIG_PARSE_ENUM(config_parse_split_mode, split_mode, SplitMode, "Failed to parse split mode setting");
+
+int config_parse_line_max(
+                const char* unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        size_t *sz = data;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+        assert(data);
+
+        if (isempty(rvalue))
+                /* Empty assignment means default */
+                *sz = DEFAULT_LINE_MAX;
+        else {
+                uint64_t v;
+
+                r = parse_size(rvalue, 1024, &v);
+                if (r < 0) {
+                        log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse LineMax= value, ignoring: %s", rvalue);
+                        return 0;
+                }
+
+                if (v < 79) {
+                        /* Why specify 79 here as minimum line length? Simply, because the most common traditional
+                         * terminal size is 80ch, and it might make sense to break one character before the natural
+                         * line break would occur on that. */
+                        log_syntax(unit, LOG_WARNING, filename, line, 0, "LineMax= too small, clamping to 79: %s", rvalue);
+                        *sz = 79;
+                } else if (v > (uint64_t) (SSIZE_MAX-1)) {
+                        /* So, why specify SSIZE_MAX-1 here? Because that's one below the largest size value read()
+                         * can return, and we need one extra byte for the trailing NUL byte. Of course IRL such large
+                         * memory allocations will fail anyway, hence this limit is mostly theoretical anyway, as we'll
+                         * fail much earlier anyway. */
+                        log_syntax(unit, LOG_WARNING, filename, line, 0, "LineMax= too large, clamping to %" PRIu64 ": %s", (uint64_t) (SSIZE_MAX-1), rvalue);
+                        *sz = SSIZE_MAX-1;
+                } else
+                        *sz = (size_t) v;
+        }
+
+        return 0;
+}
+
+int config_parse_compress(
+                const char* unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        JournalCompressOptions* compress = data;
+        int r;
+
+        if (isempty(rvalue)) {
+                compress->enabled = true;
+                compress->threshold_bytes = (uint64_t) -1;
+        } else if (streq(rvalue, "1")) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Compress= ambiguously specified as 1, enabling compression with default threshold");
+                compress->enabled = true;
+        } else if (streq(rvalue, "0")) {
+                log_syntax(unit, LOG_WARNING, filename, line, 0,
+                           "Compress= ambiguously specified as 0, disabling compression");
+                compress->enabled = false;
+        } else {
+                r = parse_boolean(rvalue);
+                if (r < 0) {
+                        r = parse_size(rvalue, 1024, &compress->threshold_bytes);
+                        if (r < 0)
+                                log_syntax(unit, LOG_WARNING, filename, line, r,
+                                           "Failed to parse Compress= value, ignoring: %s", rvalue);
+                        else
+                                compress->enabled = true;
+                } else
+                        compress->enabled = r;
+        }
+
+        return 0;
+}