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base/SOURCES/0559-journal-ensure-open-jo...

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From b36c31ddc2f3427ea2a1f700db08d8e104e4110a Mon Sep 17 00:00:00 2001
From: Jan Synacek <jsynacek@redhat.com>
Date: Thu, 5 Oct 2017 11:26:21 +0200
Subject: [PATCH] journal: ensure open journals from find_journal() (#3973)
If journals get into a closed state like when rotate fails due to
ENOSPC, when space is made available it currently goes unnoticed leaving
the journals in a closed state indefinitely.
By calling system_journal_open() on entry to find_journal() we ensure
the journal has been opened/created if possible.
Also moved system_journal_open() up to after open_journal(), before
find_journal().
Fixes https://github.com/systemd/systemd/issues/3968
(cherry picked from commit 105bdb46b4ac7eb658a2f27727216591d0bfe267)
Resolves: #1493846
---
src/journal/journald-server.c | 217 ++++++++++++++++++----------------
1 file changed, 114 insertions(+), 103 deletions(-)
diff --git a/src/journal/journald-server.c b/src/journal/journald-server.c
index c1358e1e95..96e7d61565 100644
--- a/src/journal/journald-server.c
+++ b/src/journal/journald-server.c
@@ -239,6 +239,109 @@ finish:
#endif
}
+static bool flushed_flag_is_set(void) {
+ return access("/run/systemd/journal/flushed", F_OK) >= 0;
+}
+
+static int system_journal_open(Server *s, bool flush_requested) {
+ int r;
+ char *fn;
+ sd_id128_t machine;
+ char ids[33];
+
+ r = sd_id128_get_machine(&machine);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get machine id: %m");
+
+ sd_id128_to_string(machine, ids);
+
+ if (!s->system_journal &&
+ IN_SET(s->storage, STORAGE_PERSISTENT, STORAGE_AUTO) &&
+ (flush_requested || flushed_flag_is_set())) {
+
+ /* 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_p("/var/log/journal/", 0755);
+
+ fn = strjoina("/var/log/journal/", ids);
+ (void) mkdir(fn, 0755);
+
+ fn = strjoina(fn, "/system.journal");
+ r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &s->system_journal);
+
+ if (r >= 0)
+ server_fix_perms(s, s->system_journal, 0);
+ else if (r < 0) {
+ if (r != -ENOENT && r != -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 = strjoin("/run/log/journal/", ids, "/system.journal", NULL);
+ if (!fn)
+ return -ENOMEM;
+
+ if (s->system_journal) {
+
+ /* Try to open the runtime journal, but only
+ * if it already exists, so that we can flush
+ * it into the system journal */
+
+ r = journal_file_open(fn, O_RDWR, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
+ free(fn);
+
+ 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("/run/log", 0755);
+ (void) mkdir("/run/log/journal", 0755);
+ (void) mkdir_parents(fn, 0750);
+
+ r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
+ free(fn);
+
+ if (r < 0)
+ return log_error_errno(r, "Failed to open runtime journal: %m");
+ }
+
+ if (s->runtime_journal)
+ server_fix_perms(s, s->runtime_journal, 0);
+ }
+
+ available_space(s, true);
+
+ return r;
+}
+
static JournalFile* find_journal(Server *s, uid_t uid) {
_cleanup_free_ char *p = NULL;
int r;
@@ -247,6 +350,17 @@ static JournalFile* find_journal(Server *s, uid_t uid) {
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);
+
/* 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
@@ -917,109 +1031,6 @@ finish:
dispatch_message_real(s, iovec, n, m, ucred, tv, label, label_len, unit_id, priority, object_pid);
}
-static bool flushed_flag_is_set(void) {
- return access("/run/systemd/journal/flushed", F_OK) >= 0;
-}
-
-static int system_journal_open(Server *s, bool flush_requested) {
- int r;
- char *fn;
- sd_id128_t machine;
- char ids[33];
-
- r = sd_id128_get_machine(&machine);
- if (r < 0)
- return log_error_errno(r, "Failed to get machine id: %m");
-
- sd_id128_to_string(machine, ids);
-
- if (!s->system_journal &&
- IN_SET(s->storage, STORAGE_PERSISTENT, STORAGE_AUTO) &&
- (flush_requested || flushed_flag_is_set())) {
-
- /* 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_p("/var/log/journal/", 0755);
-
- fn = strjoina("/var/log/journal/", ids);
- (void) mkdir(fn, 0755);
-
- fn = strjoina(fn, "/system.journal");
- r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, s->seal, &s->system_metrics, s->mmap, NULL, &s->system_journal);
-
- if (r >= 0)
- server_fix_perms(s, s->system_journal, 0);
- else if (r < 0) {
- if (r != -ENOENT && r != -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 = strjoin("/run/log/journal/", ids, "/system.journal", NULL);
- if (!fn)
- return -ENOMEM;
-
- if (s->system_journal) {
-
- /* Try to open the runtime journal, but only
- * if it already exists, so that we can flush
- * it into the system journal */
-
- r = journal_file_open(fn, O_RDWR, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
- free(fn);
-
- 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("/run/log", 0755);
- (void) mkdir("/run/log/journal", 0755);
- (void) mkdir_parents(fn, 0750);
-
- r = journal_file_open_reliably(fn, O_RDWR|O_CREAT, 0640, s->compress, false, &s->runtime_metrics, s->mmap, NULL, &s->runtime_journal);
- free(fn);
-
- if (r < 0)
- return log_error_errno(r, "Failed to open runtime journal: %m");
- }
-
- if (s->runtime_journal)
- server_fix_perms(s, s->runtime_journal, 0);
- }
-
- available_space(s, true);
-
- return r;
-}
-
int server_flush_to_var(Server *s, bool require_flag_file) {
sd_id128_t machine;
sd_journal *j = NULL;