static FILE *logfile;
/** The read end of the signal pipe */
static int signal_pipe;
-/** Process id of current rsync process. */
-static pid_t rsync_pid;
-/** Whether the rsync process is currently stopped */
-static int rsync_stopped;
-/** Process id of current rm process. */
-static pid_t rm_pid;
+/** Process id of current pre-create-hook/rsync/post-create-hook process. */
+static pid_t create_pid;
+/** Whether the pre-create-hook/rsync/post-create-hook is currently stopped. */
+static int create_process_stopped;
+/** Process id of current pre-remove/rm/post-remove process. */
+static pid_t remove_pid;
/** When the next snapshot is due. */
static struct timeval next_snapshot_time;
-/** The pid of the pre-create hook. */
-static pid_t pre_create_hook_pid;
-/** The pid of the post-create hook. */
-static pid_t post_create_hook_pid;
/** Creation time of the snapshot currently being created. */
static int64_t current_snapshot_creation_time;
/** Needed by the post-create hook. */
static char *path_to_last_complete_snapshot;
/** \sa \ref snap.h for details. */
static unsigned snapshot_creation_status;
+/** \sa \ref snap.h for details. */
+static unsigned snapshot_removal_status;
DEFINE_DSS_ERRLIST;
}
-static int remove_snapshot(struct snapshot *s)
+static int remove_snapshot(struct snapshot *s, char *why)
{
int fds[3] = {0, 0, 0};
- assert(!rm_pid);
+ assert(!remove_pid);
char *new_name = being_deleted_name(s);
int ret = dss_rename(s->name, new_name);
char *argv[] = {"rm", "-rf", new_name, NULL};
if (ret < 0)
goto out;
- DSS_NOTICE_LOG("removing %s (interval = %i)\n", s->name, s->interval);
- ret = dss_exec(&rm_pid, argv[0], argv, fds);
+ DSS_NOTICE_LOG("removing %s snapshot %s (interval = %i)\n",
+ why, s->name, s->interval);
+ ret = dss_exec(&remove_pid, argv[0], argv, fds);
out:
free(new_name);
return ret;
victim->name, victim->interval);
continue;
}
- ret = remove_snapshot(victim);
+ ret = remove_snapshot(victim, "redundant");
return ret < 0? ret : 1;
}
return 0;
s->name, s->interval);
continue;
}
- ret = remove_snapshot(s);
+ ret = remove_snapshot(s, "outdated");
if (ret < 0)
return ret;
return 1;
DSS_INFO_LOG("oldest snapshot: %s\n", s->name);
if (snapshot_is_being_created(s))
return 0;
- return remove_snapshot(s);
+ return remove_snapshot(s, "oldest");
}
static int rename_incomplete_snapshot(int64_t start)
snapshot_creation_status = SCS_PRE_HOOK_SUCCESS;
return 0;
}
- DSS_NOTICE_LOG("executing %s\n", conf.pre_create_hook_arg);
- ret = dss_exec_cmdline_pid(&pre_create_hook_pid,
+ DSS_DEBUG_LOG("executing %s\n", conf.pre_create_hook_arg);
+ ret = dss_exec_cmdline_pid(&create_pid,
conf.pre_create_hook_arg, fds);
if (ret < 0)
return ret;
cmd = make_message("%s %s/%s", conf.post_create_hook_arg,
conf.dest_dir_arg, path_to_last_complete_snapshot);
DSS_NOTICE_LOG("executing %s\n", cmd);
- ret = dss_exec_cmdline_pid(&post_create_hook_pid, cmd, fds);
+ ret = dss_exec_cmdline_pid(&create_pid, cmd, fds);
free(cmd);
if (ret < 0)
return ret;
kill(pid, SIGTERM);
}
-static void stop_rsync_process(void)
+static void stop_create_process(void)
{
- if (!rsync_pid || rsync_stopped)
+ if (!create_pid || create_process_stopped)
return;
- kill(SIGSTOP, rsync_pid);
- rsync_stopped = 1;
+ kill(SIGSTOP, create_pid);
+ create_process_stopped = 1;
}
-static void restart_rsync_process(void)
+static void restart_create_process(void)
{
- if (!rsync_pid || !rsync_stopped)
+ if (!create_pid || !create_process_stopped)
return;
- kill (SIGCONT, rsync_pid);
- rsync_stopped = 0;
+ kill (SIGCONT, create_pid);
+ create_process_stopped = 0;
}
-
/**
* Print a log message about the exit status of a child.
*/
static int handle_rm_exit(int status)
{
- rm_pid = 0;
+ remove_pid = 0;
if (!WIFEXITED(status))
return -E_INVOLUNTARY_EXIT;
if (WEXITSTATUS(status))
static int wait_for_rm_process(void)
{
- int status, ret = wait_for_process(rm_pid, &status);
+ int status, ret = wait_for_process(remove_pid, &status);
if (ret < 0)
return ret;
int es, ret;
if (!WIFEXITED(status)) {
- DSS_ERROR_LOG("rsync process %d died involuntary\n", (int)rsync_pid);
+ DSS_ERROR_LOG("rsync process %d died involuntary\n", (int)create_pid);
ret = -E_INVOLUNTARY_EXIT;
snapshot_creation_status = SCS_READY;
compute_next_snapshot_time();
es = WEXITSTATUS(status);
if (es == 13) { /* Errors with program diagnostics */
DSS_WARNING_LOG("rsync process %d returned %d -- restarting\n",
- (int)rsync_pid, es);
+ (int)create_pid, es);
snapshot_creation_status = SCS_RSYNC_NEEDS_RESTART;
gettimeofday(&next_snapshot_time, NULL);
next_snapshot_time.tv_sec += 60;
goto out;
}
if (es != 0 && es != 23 && es != 24) {
- DSS_ERROR_LOG("rsync process %d returned %d\n", (int)rsync_pid, es);
+ DSS_ERROR_LOG("rsync process %d returned %d\n", (int)create_pid, es);
ret = -E_BAD_EXIT_CODE;
snapshot_creation_status = SCS_READY;
compute_next_snapshot_time();
goto out;
snapshot_creation_status = SCS_RSYNC_SUCCESS;
out:
- rsync_pid = 0;
- rsync_stopped = 0;
+ create_pid = 0;
+ create_process_stopped = 0;
return ret;
}
static int handle_pre_create_hook_exit(int status)
{
int es, ret;
+ static int warn_count;
if (!WIFEXITED(status)) {
snapshot_creation_status = SCS_READY;
}
es = WEXITSTATUS(status);
if (es) {
+ if (!warn_count--) {
+ DSS_NOTICE_LOG("pre_create_hook %s returned %d\n",
+ conf.pre_create_hook_arg, es);
+ DSS_NOTICE_LOG("deferring snapshot creation...\n");
+ warn_count = 60; /* warn only once per hour */
+ }
snapshot_creation_status = SCS_READY;
compute_next_snapshot_time();
- ret = -E_BAD_EXIT_CODE;
+ ret = 0;
goto out;
}
+ warn_count = 0;
snapshot_creation_status = SCS_PRE_HOOK_SUCCESS;
ret = 1;
out:
- pre_create_hook_pid = 0;
+ create_pid = 0;
return ret;
}
if (ret <= 0)
return ret;
- if (pid == rsync_pid)
- return handle_rsync_exit(status);
- if (pid == rm_pid)
- return handle_rm_exit(status);
- if (pid == pre_create_hook_pid)
- return handle_pre_create_hook_exit(status);
- if (pid == post_create_hook_pid) {
- snapshot_creation_status = SCS_READY;
- compute_next_snapshot_time();
- return 1;
+
+ if (pid == create_pid) {
+ switch (snapshot_creation_status) {
+ case SCS_PRE_HOOK_RUNNING:
+ return handle_pre_create_hook_exit(status);
+ case SCS_RSYNC_RUNNING:
+ return handle_rsync_exit(status);
+ case SCS_POST_HOOK_RUNNING:
+ snapshot_creation_status = SCS_READY;
+ compute_next_snapshot_time();
+ return 1;
+ default:
+ DSS_EMERG_LOG("BUG: create can't die in status %d\n",
+ snapshot_creation_status);
+ return -E_BUG;
+ }
}
+ if (pid == remove_pid)
+ return handle_rm_exit(status);
DSS_EMERG_LOG("BUG: unknown process %d died\n", (int)pid);
return -E_BUG;
}
switch (sig) {
case SIGINT:
case SIGTERM:
- restart_rsync_process();
- kill_process(rsync_pid);
- kill_process(rm_pid);
+ restart_create_process();
+ kill_process(create_pid);
+ kill_process(remove_pid);
ret = -E_SIGNAL;
break;
case SIGHUP:
name = incomplete_name(current_snapshot_creation_time);
DSS_NOTICE_LOG("creating new snapshot %s\n", name);
free(name);
- ret = dss_exec(&rsync_pid, argv[0], argv, fds);
+ ret = dss_exec(&create_pid, argv[0], argv, fds);
if (ret < 0)
return ret;
snapshot_creation_status = SCS_RSYNC_RUNNING;
int low_disk_space;
struct timeval now, *tvp;
- if (rm_pid)
+ if (remove_pid)
tvp = NULL; /* sleep until rm process dies */
else { /* sleep one minute */
tv.tv_sec = 60;
if (ret < 0)
goto out;
}
- if (rm_pid)
+ if (remove_pid)
continue;
ret = disk_space_low();
if (ret < 0)
ret = try_to_free_disk_space(low_disk_space);
if (ret < 0)
goto out;
- if (rm_pid) {
- stop_rsync_process();
+ if (remove_pid) {
+ stop_create_process();
continue;
}
- restart_rsync_process();
+ restart_create_process();
gettimeofday(&now, NULL);
if (tv_diff(&next_snapshot_time, &now, NULL) > 0)
continue;
ret = pre_create_hook();
if (ret < 0)
return ret;
- if (pre_create_hook_pid) {
- ret = wait_for_process(pre_create_hook_pid, &status);
+ if (create_pid) {
+ ret = wait_for_process(create_pid, &status);
if (ret < 0)
return ret;
ret = handle_pre_create_hook_exit(status);
- if (ret < 0)
+ if (ret <= 0) /* error, or pre-create failed */
return ret;
}
create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
ret = create_snapshot(rsync_argv);
if (ret < 0)
goto out;
- ret = wait_for_process(rsync_pid, &status);
+ ret = wait_for_process(create_pid, &status);
if (ret < 0)
goto out;
ret = handle_rsync_exit(status);
if (ret < 0)
goto out;
post_create_hook();
- if (post_create_hook_pid)
- ret = wait_for_process(post_create_hook_pid, &status);
+ if (create_pid)
+ ret = wait_for_process(create_pid, &status);
out:
free_rsync_argv(rsync_argv);
return ret;
projects / dss.git / blobdiff