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journald-server.c
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journald-server.c
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/* 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 "initrd-util.h"
#include "io-util.h"
#include "journal-authenticate.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 "uid-alloc-range.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 DEFAULT_KMSG_OWN_INTERVAL (5 * USEC_PER_SEC)
#define DEFAULT_KMSG_OWN_BURST 50
#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)
#define FAILED_TO_WRITE_ENTRY_RATELIMIT ((const RateLimit) { .interval = 1 * USEC_PER_SEC, .burst = 1 })
static int server_determine_path_usage(
Server *s,
const char *path,
uint64_t *ret_used,
uint64_t *ret_free) {
_cleanup_closedir_ DIR *d = NULL;
struct statvfs ss;
assert(s);
assert(path);
assert(ret_used);
assert(ret_free);
d = opendir(path);
if (!d)
return log_ratelimit_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR,
errno, JOURNAL_LOG_RATELIMIT, "Failed to open %s: %m", path);
if (fstatvfs(dirfd(d), &ss) < 0)
return log_ratelimit_error_errno(errno, JOURNAL_LOG_RATELIMIT,
"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 && usec_add(space->timestamp, RECHECK_SPACE_USEC) > ts)
return 0;
r = server_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 = CLAMP(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 server_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) {
assert(s);
if (!storage)
storage = server_current_storage(s);
if (cache_space_refresh(s, storage) < 0)
return;
const JournalMetrics *metrics = &storage->metrics;
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,
FORMAT_BYTES(storage->space.vfs_used),
FORMAT_BYTES(storage->space.limit),
FORMAT_BYTES(storage->space.available)),
"JOURNAL_NAME=%s", storage->name,
"JOURNAL_PATH=%s", storage->path,
"CURRENT_USE=%"PRIu64, storage->space.vfs_used,
"CURRENT_USE_PRETTY=%s", FORMAT_BYTES(storage->space.vfs_used),
"MAX_USE=%"PRIu64, metrics->max_use,
"MAX_USE_PRETTY=%s", FORMAT_BYTES(metrics->max_use),
"DISK_KEEP_FREE=%"PRIu64, metrics->keep_free,
"DISK_KEEP_FREE_PRETTY=%s", FORMAT_BYTES(metrics->keep_free),
"DISK_AVAILABLE=%"PRIu64, storage->space.vfs_available,
"DISK_AVAILABLE_PRETTY=%s", FORMAT_BYTES(storage->space.vfs_available),
"LIMIT=%"PRIu64, storage->space.limit,
"LIMIT_PRETTY=%s", FORMAT_BYTES(storage->space.limit),
"AVAILABLE=%"PRIu64, storage->space.available,
"AVAILABLE_PRETTY=%s", FORMAT_BYTES(storage->space.available),
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(ManagedJournalFile *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->file->fd, uid, ACL_READ);
if (r < 0)
log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"Failed to set ACL on %s, ignoring: %m", f->file->path);
#endif
}
static int server_open_journal(
Server *s,
bool reliably,
const char *fname,
int open_flags,
bool seal,
JournalMetrics *metrics,
ManagedJournalFile **ret) {
_cleanup_(managed_journal_file_closep) ManagedJournalFile *f = NULL;
JournalFileFlags file_flags;
int r;
assert(s);
assert(fname);
assert(ret);
file_flags =
(s->compress.enabled ? JOURNAL_COMPRESS : 0) |
(seal ? JOURNAL_SEAL : 0) |
JOURNAL_STRICT_ORDER;
if (reliably)
r = managed_journal_file_open_reliably(
fname,
open_flags,
file_flags,
0640,
s->compress.threshold_bytes,
metrics,
s->mmap,
s->deferred_closes,
/* template= */ NULL,
&f);
else
r = managed_journal_file_open(
/* fd= */ -1,
fname,
open_flags,
file_flags,
0640,
s->compress.threshold_bytes,
metrics,
s->mmap,
s->deferred_closes,
/* template= */ NULL,
&f);
if (r < 0)
return r;
r = journal_file_enable_post_change_timer(f->file, s->event, POST_CHANGE_TIMER_INTERVAL_USEC);
if (r < 0)
return r;
*ret = TAKE_PTR(f);
return r;
}
static bool server_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 server_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 || server_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 = server_open_journal(
s,
/* reliably= */ 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_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"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 = server_open_journal(
s,
/* reliably= */ false,
fn,
O_RDWR,
/* seal= */ false,
&s->runtime_storage.metrics,
&s->runtime_journal);
if (r < 0) {
if (r != -ENOENT)
log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"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 = server_open_journal(
s,
/* reliably= */ true,
fn,
O_RDWR|O_CREAT,
/* seal= */ false,
&s->runtime_storage.metrics,
&s->runtime_journal);
if (r < 0)
return log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"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 int server_find_user_journal(Server *s, uid_t uid, ManagedJournalFile **ret) {
_cleanup_(managed_journal_file_closep) ManagedJournalFile *f = NULL;
_cleanup_free_ char *p = NULL;
int r;
assert(!uid_for_system_journal(uid));
f = ordered_hashmap_get(s->user_journals, UID_TO_PTR(uid));
if (f)
goto found;
if (asprintf(&p, "%s/user-" UID_FMT ".journal", s->system_storage.path, uid) < 0)
return log_oom();
/* Too many open? Then let's close one (or more) */
while (ordered_hashmap_size(s->user_journals) >= USER_JOURNALS_MAX) {
ManagedJournalFile *first;
assert_se(first = ordered_hashmap_steal_first(s->user_journals));
(void) managed_journal_file_close(first);
}
r = server_open_journal(
s,
/* reliably= */ true,
p,
O_RDWR|O_CREAT,
s->seal,
&s->system_storage.metrics,
&f);
if (r < 0)
return r;
r = ordered_hashmap_put(s->user_journals, UID_TO_PTR(uid), f);
if (r < 0)
return r;
server_add_acls(f, uid);
found:
*ret = TAKE_PTR(f);
return 0;
}
static ManagedJournalFile* server_find_journal(Server *s, uid_t uid) {
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) server_system_journal_open(s, /* flush_requested= */ false, /* relinquish_requested= */ 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 we are not in persistent mode, then we need return NULL immediately rather than opening a
* persistent journal of any sort.
*
* Fixes https://github.com/systemd/systemd/issues/20390 */
if (!IN_SET(s->storage, STORAGE_AUTO, STORAGE_PERSISTENT))
return NULL;
if (!uid_for_system_journal(uid)) {
ManagedJournalFile *f = NULL;
r = server_find_user_journal(s, uid, &f);
if (r >= 0)
return ASSERT_PTR(f);
log_warning_errno(r, "Failed to open user journal file, falling back to system journal: %m");
}
return s->system_journal;
}
static int server_do_rotate(
Server *s,
ManagedJournalFile **f,
const char* name,
bool seal,
uint32_t uid) {
JournalFileFlags file_flags;
int r;
assert(s);
if (!*f)
return -EINVAL;
file_flags =
(s->compress.enabled ? JOURNAL_COMPRESS : 0)|
(seal ? JOURNAL_SEAL : 0) |
JOURNAL_STRICT_ORDER;
r = managed_journal_file_rotate(f, s->mmap, file_flags, s->compress.threshold_bytes, s->deferred_closes);
if (r < 0) {
if (*f)
return log_ratelimit_error_errno(r, JOURNAL_LOG_RATELIMIT,
"Failed to rotate %s: %m", (*f)->file->path);
else
return log_ratelimit_error_errno(r, JOURNAL_LOG_RATELIMIT,
"Failed to create new %s journal: %m", name);
}
server_add_acls(*f, uid);
return r;
}
static void server_process_deferred_closes(Server *s) {
ManagedJournalFile *f;
/* Perform any deferred closes which aren't still offlining. */
SET_FOREACH(f, s->deferred_closes) {
if (managed_journal_file_is_offlining(f))
continue;
(void) set_remove(s->deferred_closes, f);
(void) managed_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) {
ManagedJournalFile *f;
assert_se(f = set_steal_first(s->deferred_closes));
managed_journal_file_close(f);
}
}
static int server_archive_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_ratelimit_error_errno(errno, JOURNAL_LOG_RATELIMIT,
"Failed to open %s: %m", s->system_storage.path);
}
for (;;) {
_cleanup_free_ char *full = NULL;
_cleanup_close_ int fd = -EBADF;
struct dirent *de;
ManagedJournalFile *f;
uid_t uid;
errno = 0;
de = readdir_no_dot(d);
if (!de) {
if (errno != 0)
log_ratelimit_warning_errno(errno, JOURNAL_LOG_RATELIMIT,
"Failed to enumerate %s, ignoring: %m",
s->system_storage.path);
break;
}
r = journal_file_parse_uid_from_filename(de->d_name, &uid);
if (r < 0) {
/* Don't warn if the file is not an online or offline user journal. */
if (r != -EREMOTE)
log_warning_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_ratelimit_full_errno(IN_SET(errno, ELOOP, ENOENT) ? LOG_DEBUG : LOG_WARNING,
errno, JOURNAL_LOG_RATELIMIT,
"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 = managed_journal_file_open(
fd,
full,
O_RDWR,
(s->compress.enabled ? JOURNAL_COMPRESS : 0) |
(s->seal ? JOURNAL_SEAL : 0), /* strict order does not matter here */
0640,
s->compress.threshold_bytes,
&s->system_storage.metrics,
s->mmap,
s->deferred_closes,
/* template= */ NULL,
&f);
if (r < 0) {
log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"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_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"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 managed_journal_file_open() */
r = journal_file_archive(f->file, NULL);
if (r < 0)
log_debug_errno(r, "Failed to archive journal file '%s', ignoring: %m", full);
managed_journal_file_initiate_close(TAKE_PTR(f), s->deferred_closes);
}
return 0;
}
void server_rotate(Server *s) {
ManagedJournalFile *f;
void *k;
int r;
log_debug("Rotating...");
/* First, rotate the system journal (either in its runtime flavour or in its runtime flavour) */
(void) server_do_rotate(s, &s->runtime_journal, "runtime", /* seal= */ false, /* uid= */ 0);
(void) server_do_rotate(s, &s->system_journal, "system", s->seal, /* uid= */ 0);
/* Then, rotate all user journals we have open (keeping them open) */
ORDERED_HASHMAP_FOREACH_KEY(f, k, s->user_journals) {
r = server_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) server_archive_offline_user_journals(s);
server_process_deferred_closes(s);
}
void server_sync(Server *s) {
ManagedJournalFile *f;
int r;
if (s->system_journal) {
r = managed_journal_file_set_offline(s->system_journal, false);
if (r < 0)
log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"Failed to sync system journal, ignoring: %m");
}
ORDERED_HASHMAP_FOREACH(f, s->user_journals) {
r = managed_journal_file_set_offline(f, false);
if (r < 0)
log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"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_ratelimit_error_errno(r, JOURNAL_LOG_RATELIMIT,
"Failed to disable sync timer source: %m");
}
s->sync_scheduled = false;
}
static void server_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_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"Failed to vacuum %s, ignoring: %m", storage->path);
cache_space_invalidate(&storage->space);
}
void server_vacuum(Server *s, bool verbose) {
assert(s);
log_debug("Vacuuming...");
s->oldest_file_usec = 0;
if (s->system_journal)
server_do_vacuum(s, &s->system_storage, verbose);
if (s->runtime_journal)
server_do_vacuum(s, &s->runtime_storage, verbose);
}
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_errno(r, "%s: Allocation limit reached, rotating.", f->path);
return true;
case -EROFS: /* Read-only file system */
/* When appending an entry fails if shall_try_append_again returns true, the journal is
* rotated. If the FS is read-only, rotation will fail and s->system_journal will be set to
* NULL. After that, when find_journal will try to open the journal since s->system_journal
* will be NULL, it will open the runtime journal. */
log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Read-only file system, rotating.", f->path);
return true;
case -EIO: /* I/O error of some kind (mmap) */
log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT, "%s: IO error, rotating.", f->path);
return true;
case -EHOSTDOWN: /* Other machine */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Journal file from other machine, rotating.", f->path);
return true;
case -EBUSY: /* Unclean shutdown */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Unclean shutdown, rotating.", f->path);
return true;
case -EPROTONOSUPPORT: /* Unsupported feature */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Unsupported feature, rotating.", f->path);
return true;
case -EBADMSG: /* Corrupted */
case -ENODATA: /* Truncated */
case -ESHUTDOWN: /* Already archived */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Journal file corrupted, rotating.", f->path);
return true;
case -EIDRM: /* Journal file has been deleted */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Journal file has been deleted, rotating.", f->path);
return true;
case -EREMCHG: /* Wallclock time (CLOCK_REALTIME) jumped backwards relative to last journal entry */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Realtime clock jumped backwards relative to last journal entry, rotating.", f->path);
return true;
case -EREMOTE: /* Boot ID different from the one of the last entry */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Boot ID changed since last record, rotating.", f->path);
return true;
case -ENOTNAM: /* Monotonic time (CLOCK_MONOTONIC) jumped backwards relative to last journal entry */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Monotonic clock jumped backwards relative to last journal entry, rotating.", f->path);
return true;
case -EILSEQ: /* seqnum ID last used in the file doesn't match the one we'd passed when writing an entry to it */
log_ratelimit_info_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Journal file uses a different sequence number ID, rotating.", f->path);
return true;
case -EAFNOSUPPORT:
log_ratelimit_error_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Underlying file system does not support memory mapping or another required file system feature.", f->path);
return false;
default:
log_ratelimit_error_errno(r, JOURNAL_LOG_RATELIMIT, "%s: Unexpected error while writing to journal file: %m", f->path);
return false;
}
}
static void server_write_to_journal(
Server *s,
uid_t uid,
const struct iovec *iovec,
size_t n,
int priority) {
bool vacuumed = false, rotate = false;
struct dual_timestamp ts;
ManagedJournalFile *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_ratelimit_info(JOURNAL_LOG_RATELIMIT, "Time jumped backwards, rotating.");
rotate = true;
} else {
f = server_find_journal(s, uid);
if (!f)
return;
if (journal_file_rotate_suggested(f->file, s->max_file_usec, LOG_INFO)) {
log_ratelimit_info(JOURNAL_LOG_RATELIMIT,
"%s: Journal header limits reached or header out-of-date, rotating.",
f->file->path);
rotate = true;
}
}
if (rotate) {
server_rotate(s);
server_vacuum(s, false);
vacuumed = true;
f = server_find_journal(s, uid);
if (!f)
return;
}
s->last_realtime_clock = ts.realtime;
r = journal_file_append_entry(
f->file,
&ts,
/* boot_id= */ NULL,
iovec, n,
&s->seqnum->seqnum,
&s->seqnum->id,
/* ret_object= */ NULL,
/* ret_offset= */ NULL);
if (r >= 0) {
server_schedule_sync(s, priority);
return;
}
log_debug_errno(r, "Failed to write entry to %s (%zu items, %zu bytes): %m", f->file->path, n, IOVEC_TOTAL_SIZE(iovec, n));
if (!shall_try_append_again(f->file, r))
return;
if (vacuumed) {
log_ratelimit_warning_errno(r, JOURNAL_LOG_RATELIMIT,
"Suppressing rotation, as we already rotated immediately before write attempt. Giving up.");
return;
}
server_rotate(s);
server_vacuum(s, false);
f = server_find_journal(s, uid);
if (!f)
return;
log_debug_errno(r, "Retrying write.");
r = journal_file_append_entry(
f->file,
&ts,
/* boot_id= */ NULL,
iovec, n,
&s->seqnum->seqnum,
&s->seqnum->id,
/* ret_object= */ NULL,
/* ret_offset= */ NULL);
if (r < 0)
log_ratelimit_error_errno(r, FAILED_TO_WRITE_ENTRY_RATELIMIT,