/*
- * Copyright (C) 2008-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2008-2010 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/** 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;
+static int64_t next_snapshot_time;
/** When to try to remove something. */
static struct timeval next_removal_check;
/** Creation time of the snapshot currently being created. */
DEFINE_DSS_ERRLIST;
+static const char const *hook_status_description[] = {HOOK_STATUS_ARRAY};
+/* may be called with ds == NULL. */
+static int disk_space_low(struct disk_space *ds)
+{
+ struct disk_space ds_struct;
+
+ if (!ds) {
+ int ret = get_disk_space(".", &ds_struct);
+ if (ret < 0)
+ return ret;
+ ds = &ds_struct;
+ }
+ if (conf.min_free_mb_arg)
+ if (ds->free_mb < conf.min_free_mb_arg)
+ return 1;
+ if (conf.min_free_percent_arg)
+ if (ds->percent_free < conf.min_free_percent_arg)
+ return 1;
+ if (conf.min_free_percent_inodes_arg)
+ if (ds->percent_free_inodes < conf.min_free_percent_inodes_arg)
+ return 1;
+ return 0;
+}
+
+static void dump_dss_config(const char *msg)
+{
+ const char dash[] = "-----------------------------";
+ int ret;
+ FILE *log = logfile? logfile : stderr;
+ struct disk_space ds;
+ int64_t now = get_current_time();
+
+ if (conf.loglevel_arg > INFO)
+ return;
+
+ fprintf(log, "%s <%s config> %s\n", dash, msg, dash);
+ fprintf(log, "\n*** disk space ***\n\n");
+ ret = get_disk_space(".", &ds);
+ if (ret >= 0) {
+ DSS_INFO_LOG("disk space low: %s\n", disk_space_low(&ds)?
+ "yes" : "no");
+ log_disk_space(&ds);
+ } else
+ DSS_ERROR_LOG("can not get free disk space: %s\n",
+ dss_strerror(-ret));
+
+ /* we continue on errors from get_disk_space */
+
+ fprintf(log, "\n*** command line and config file options ***\n\n");
+ cmdline_parser_dump(log, &conf);
+ fprintf(log, "\n*** internal state ***\n\n");
+ fprintf(log,
+ "pid: %d\n"
+ "logile: %s\n"
+ "snapshot_currently_being_removed: %s\n"
+ "path_to_last_complete_snapshot: %s\n"
+ "reference_snapshot: %s\n"
+ "snapshot_creation_status: %s\n"
+ "snapshot_removal_status: %s\n"
+ ,
+ (int) getpid(),
+ logfile? conf.logfile_arg : "stderr",
+ snapshot_currently_being_removed?
+ snapshot_currently_being_removed->name : "(none)",
+ path_to_last_complete_snapshot?
+ path_to_last_complete_snapshot : "(none)",
+ name_of_reference_snapshot?
+ name_of_reference_snapshot : "(none)",
+ hook_status_description[snapshot_creation_status],
+ hook_status_description[snapshot_removal_status]
+ );
+ if (create_pid != 0)
+ fprintf(log,
+ "create_pid: %" PRId32 "\n"
+ "create process is %sstopped\n"
+ ,
+ create_pid,
+ create_process_stopped? "" : "not "
+ );
+ if (remove_pid != 0)
+ fprintf(log, "remove_pid: %" PRId32 "\n", remove_pid);
+ if (next_snapshot_time != 0)
+ fprintf(log, "next snapshot due in %" PRId64 " seconds\n",
+ next_snapshot_time - now);
+ if (current_snapshot_creation_time != 0)
+ fprintf(log, "current_snapshot_creation_time: %"
+ PRId64 " (%" PRId64 " seconds ago)\n",
+ current_snapshot_creation_time,
+ now - current_snapshot_creation_time
+ );
+ if (next_removal_check.tv_sec != 0) {
+ fprintf(log, "next removal check: %llu (%llu seconds ago)\n",
+ (long long unsigned)next_removal_check.tv_sec,
+ now - (long long unsigned)next_removal_check.tv_sec
+ );
+
+ }
+ fprintf(log, "%s </%s config> %s\n", dash, msg, dash);
+}
/* a litte cpp magic helps to DRY */
#define COMMANDS \
va_end(argp);
}
-static int disk_space_low(void)
-{
- struct disk_space ds;
- int ret = get_disk_space(".", &ds);
-
- if (ret < 0)
- return ret;
- if (conf.min_free_mb_arg)
- if (ds.free_mb < conf.min_free_mb_arg)
- return 1;
- if (conf.min_free_percent_arg)
- if (ds.percent_free < conf.min_free_percent_arg)
- return 1;
- if (conf.min_free_percent_inodes_arg)
- if (ds.percent_free_inodes < conf.min_free_percent_inodes_arg)
- return 1;
- return 0;
-}
-
static void dss_get_snapshot_list(struct snapshot_list *sl)
{
get_snapshot_list(sl, conf.unit_interval_arg, conf.num_intervals_arg);
}
-static int next_snapshot_is_due(void)
+static int64_t compute_next_snapshot_time(void)
{
- struct timeval now, unit_interval = {.tv_sec = 24 * 3600 * conf.unit_interval_arg},
- tmp, diff;
- int64_t x = 0;
+ int64_t x = 0, now = get_current_time(), unit_interval
+ = 24 * 3600 * conf.unit_interval_arg, ret;
unsigned wanted = desired_number_of_snapshots(0, conf.num_intervals_arg),
num_complete_snapshots = 0;
- int i, ret;
+ int i;
struct snapshot *s = NULL;
struct snapshot_list sl;
- gettimeofday(&now, NULL);
- if (tv_diff(&next_snapshot_time, &now, NULL) > 0)
- return 0;
- assert(snapshot_creation_status == HS_READY);
- current_snapshot_creation_time = 0;
dss_get_snapshot_list(&sl);
FOR_EACH_SNAPSHOT(s, i, &sl) {
if (!(s->flags & SS_COMPLETE))
x += s->completion_time - s->creation_time;
}
assert(x >= 0);
- if (num_complete_snapshots)
- x /= num_complete_snapshots; /* avg time to create one snapshot */
- x *= wanted; /* time to create all snapshots in interval 0 */
- tmp.tv_sec = x;
- tmp.tv_usec = 0;
- ret = tv_diff(&unit_interval, &tmp, &diff); /* total sleep time per unit interval */
- if (ret < 0 || !s) { /* unit_interval < tmp or no snapshot */
- ret = 1;
- goto out;
- }
- tv_divide(wanted, &diff, &tmp); /* sleep time between two snapshots */
- diff.tv_sec = s->completion_time; /* completion time of the latest snapshot */
- diff.tv_usec = 0;
- tv_add(&diff, &tmp, &next_snapshot_time);
- ret = (tv_diff(&now, &next_snapshot_time, &diff) < 0)? 0 : 1;
+ ret = now;
+ if (num_complete_snapshots == 0)
+ goto out;
+ x /= num_complete_snapshots; /* avg time to create one snapshot */
+ if (unit_interval < x * wanted) /* oops, no sleep at all */
+ goto out;
+ ret = s->completion_time + unit_interval / wanted - x;
out:
free_snapshot_list(&sl);
- if (ret == 0)
- DSS_DEBUG_LOG("next snapshot due in %lu seconds\n",
- tv2ms(&diff) / 1000);
- else
- DSS_DEBUG_LOG("next snapshot: now\n");
return ret;
}
+static inline void invalidate_next_snapshot_time(void)
+{
+ next_snapshot_time = 0;
+}
+
+static inline int next_snapshot_time_is_valid(void)
+{
+ return next_snapshot_time != 0;
+}
+
+static int next_snapshot_is_due(void)
+{
+ int64_t now = get_current_time();
+
+ if (!next_snapshot_time_is_valid())
+ next_snapshot_time = compute_next_snapshot_time();
+ if (next_snapshot_time <= now) {
+ DSS_DEBUG_LOG("next snapshot: now\n");
+ return 1;
+ }
+ DSS_DEBUG_LOG("next snapshot due in %" PRId64 " seconds\n",
+ next_snapshot_time - now);
+ return 0;
+}
+
static int pre_create_hook(void)
{
int ret, fds[3] = {0, 0, 0};
assert(snapshot_creation_status == HS_READY);
- if (!conf.pre_create_hook_given) {
- snapshot_creation_status = HS_PRE_SUCCESS;
- return 0;
- }
+ /* make sure that the next snapshot time will be recomputed */
+ invalidate_next_snapshot_time();
DSS_DEBUG_LOG("executing %s\n", conf.pre_create_hook_arg);
ret = dss_exec_cmdline_pid(&create_pid,
conf.pre_create_hook_arg, fds);
*snapshot_currently_being_removed = *s;
snapshot_currently_being_removed->name = dss_strdup(s->name);
- if (!conf.pre_remove_hook_given) {
- snapshot_removal_status = HS_PRE_SUCCESS;
- return 0;
- }
cmd = make_message("%s %s/%s", conf.pre_remove_hook_arg,
conf.dest_dir_arg, s->name);
DSS_DEBUG_LOG("executing %s\n", cmd);
- ret = dss_exec_cmdline_pid(&remove_pid,
- conf.pre_remove_hook_arg, fds);
+ ret = dss_exec_cmdline_pid(&remove_pid, cmd, fds);
free(cmd);
if (ret < 0)
return ret;
int i;
struct snapshot *s;
- DSS_DEBUG_LOG("looking for snapshots belonging to intervals greater than %d\n",
+ DSS_DEBUG_LOG("looking for snapshots belonging to intervals >= %d\n",
conf.num_intervals_arg);
FOR_EACH_SNAPSHOT(s, i, sl) {
if (snapshot_is_being_created(s))
continue;
if (is_reference_snapshot(s))
continue;
- if (s->interval <= conf.num_intervals_arg)
+ if (s->interval < conf.num_intervals_arg)
continue;
return s;
}
const char *why;
int low_disk_space;
- ret = disk_space_low();
+ ret = disk_space_low(NULL);
if (ret < 0)
return ret;
low_disk_space = ret;
gettimeofday(&now, NULL);
if (tv_diff(&next_removal_check, &now, NULL) > 0)
return 0;
- if (!low_disk_space && conf.keep_redundant_given)
- return 0;
+ if (!low_disk_space) {
+ if (conf.keep_redundant_given)
+ return 0;
+ if (snapshot_creation_status != HS_READY)
+ return 0;
+ if (next_snapshot_is_due())
+ return 0;
+ }
dss_get_snapshot_list(&sl);
ret = 0;
if (!low_disk_space && sl.num_snapshots <= 1)
int ret, fds[3] = {0, 0, 0};
char *cmd;
- if (!conf.post_create_hook_given) {
- snapshot_creation_status = HS_READY;
- return 0;
- }
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);
assert(s);
- if (!conf.post_remove_hook_given) {
- snapshot_removal_status = HS_READY;
- return 0;
- }
cmd = make_message("%s %s/%s", conf.post_remove_hook_arg,
conf.dest_dir_arg, s->name);
DSS_NOTICE_LOG("executing %s\n", cmd);
return ret;
}
-static void kill_process(pid_t pid)
+static void dss_kill(pid_t pid, int sig, const char *msg)
{
- if (!pid)
+ const char *signame, *process_name;
+
+ if (pid == 0)
return;
- DSS_WARNING_LOG("sending SIGTERM to pid %d\n", (int)pid);
- kill(pid, SIGTERM);
+ switch (sig) {
+ case SIGTERM: signame = "TERM"; break;
+ case SIGSTOP: signame = "STOP"; break;
+ case SIGCONT: signame = "CONT"; break;
+ default: signame = "????";
+ }
+
+ if (pid == create_pid)
+ process_name = "create";
+ else if (pid == remove_pid)
+ process_name = "remove";
+ else process_name = "??????";
+
+ if (msg)
+ DSS_INFO_LOG("%s\n", msg);
+ DSS_DEBUG_LOG("sending signal %d (%s) to pid %d (%s process)\n",
+ sig, signame, (int)pid, process_name);
+ if (kill(pid, sig) >= 0)
+ return;
+ DSS_INFO_LOG("failed to send signal %d (%s) to pid %d (%s process)\n",
+ sig, signame, (int)pid, process_name);
}
static void stop_create_process(void)
{
- if (!create_pid || create_process_stopped)
+ if (create_process_stopped)
return;
- kill(SIGSTOP, create_pid);
+ dss_kill(create_pid, SIGSTOP, "suspending create process");
create_process_stopped = 1;
}
static void restart_create_process(void)
{
- if (!create_pid || !create_process_stopped)
+ if (!create_process_stopped)
return;
- kill (SIGCONT, create_pid);
+ dss_kill(create_pid, SIGCONT, "resuming create process");
create_process_stopped = 0;
}
}
}
/* SIGINT or SIGTERM */
- DSS_WARNING_LOG("sending SIGTERM to pid %d\n", (int)pid);
- kill(pid, SIGTERM);
+ dss_kill(pid, SIGTERM, "killing child process");
}
if (ret < 0)
DSS_ERROR_LOG("failed to wait for process %d\n", (int)pid);
snapshot_removal_status = HS_READY;
return -E_BAD_EXIT_CODE;
}
- if (conf.post_remove_hook_given)
- snapshot_removal_status = HS_SUCCESS;
- else
- snapshot_removal_status = HS_READY;
+ snapshot_removal_status = HS_SUCCESS;
return 1;
}
DSS_WARNING_LOG("rsync process %d returned %d -- restarting\n",
(int)create_pid, es);
snapshot_creation_status = HS_NEEDS_RESTART;
- gettimeofday(&next_snapshot_time, NULL);
- next_snapshot_time.tv_sec += 60;
+ next_snapshot_time = get_current_time() + 60;
ret = 1;
goto out;
}
free(name_of_reference_snapshot);
name_of_reference_snapshot = NULL;
out:
- create_pid = 0;
create_process_stopped = 0;
return ret;
}
DSS_NOTICE_LOG("deferring snapshot creation...\n");
warn_count = 60; /* warn only once per hour */
}
- gettimeofday(&next_snapshot_time, NULL);
- next_snapshot_time.tv_sec += 60;
+ next_snapshot_time = get_current_time() + 60;
snapshot_creation_status = HS_READY;
ret = 0;
goto out;
snapshot_creation_status = HS_PRE_SUCCESS;
ret = 1;
out:
- create_pid = 0;
return ret;
}
if (pid == create_pid) {
switch (snapshot_creation_status) {
case HS_PRE_RUNNING:
- return handle_pre_create_hook_exit(status);
+ ret = handle_pre_create_hook_exit(status);
+ break;
case HS_RUNNING:
- return handle_rsync_exit(status);
+ ret = handle_rsync_exit(status);
+ break;
case HS_POST_RUNNING:
snapshot_creation_status = HS_READY;
- return 1;
+ ret = 1;
+ break;
default:
DSS_EMERG_LOG("BUG: create can't die in status %d\n",
snapshot_creation_status);
return -E_BUG;
}
+ create_pid = 0;
+ return ret;
}
if (pid == remove_pid) {
ret = handle_remove_exit(status);
return 1;
}
+/*
+ * Returns < 0 on errors, 0 if no config file is given and > 0 if the config
+ * file was read successfully.
+ */
static int parse_config_file(int override)
{
- int ret;
+ int ret, config_file_exists;
char *config_file;
struct stat statbuf;
char *old_logfile_arg = NULL;
old_daemon_given = conf.daemon_given;
}
- ret = stat(config_file, &statbuf);
- if (ret && conf.config_file_given) {
+ config_file_exists = !stat(config_file, &statbuf);
+ if (!config_file_exists && conf.config_file_given) {
ret = -ERRNO_TO_DSS_ERROR(errno);
DSS_ERROR_LOG("failed to stat config file %s\n", config_file);
goto out;
}
- if (!ret) {
+ if (config_file_exists) {
struct cmdline_parser_params params = {
.override = override,
.initialize = 0,
log_welcome(conf.loglevel_arg);
}
DSS_DEBUG_LOG("loglevel: %d\n", conf.loglevel_arg);
-// cmdline_parser_dump(logfile? logfile : stdout, &conf);
+ ret = config_file_exists;
out:
free(config_file);
if (ret < 0)
{
int ret;
- DSS_NOTICE_LOG("SIGHUP\n");
+ DSS_NOTICE_LOG("SIGHUP, re-reading config\n");
+ dump_dss_config("old");
ret = parse_config_file(1);
if (ret < 0)
return ret;
+ dump_dss_config("reloaded");
+ invalidate_next_snapshot_time();
return change_to_dest_dir();
}
case SIGINT:
case SIGTERM:
restart_create_process();
- kill_process(create_pid);
- kill_process(remove_pid);
+ dss_kill(create_pid, SIGTERM, NULL);
+ dss_kill(remove_pid, SIGTERM, NULL);
ret = -E_SIGNAL;
break;
case SIGHUP:
return 1;
}
+static int rename_resume_snap(int64_t creation_time)
+{
+ struct snapshot_list sl = {.num_snapshots = 0};
+ struct snapshot *s;
+ char *new_name = incomplete_name(creation_time);
+ int ret;
+
+ ret = 0;
+ if (conf.no_resume_given)
+ goto out;
+ dss_get_snapshot_list(&sl);
+ s = get_newest_snapshot(&sl);
+ if (!s)
+ goto out;
+ if ((s->flags & SS_COMPLETE) != 0) /* complete */
+ goto out;
+ DSS_INFO_LOG("resuming: reusing %s as destination dir\n", s->name);
+ ret = dss_rename(s->name, new_name);
+out:
+ if (ret >= 0)
+ DSS_NOTICE_LOG("creating new snapshot %s\n", new_name);
+ free(new_name);
+ free_snapshot_list(&sl);
+ return ret;
+}
+
static void create_rsync_argv(char ***argv, int64_t *num)
{
char *logname;
static int create_snapshot(char **argv)
{
int ret, fds[3] = {0, 0, 0};
- char *name;
- name = incomplete_name(current_snapshot_creation_time);
- DSS_NOTICE_LOG("creating new snapshot %s\n", name);
- free(name);
+ ret = rename_resume_snap(current_snapshot_creation_time);
+ if (ret < 0)
+ return ret;
ret = dss_exec(&create_pid, argv[0], argv, fds);
if (ret < 0)
return ret;
}
FD_ZERO(&rfds);
FD_SET(signal_pipe, &rfds);
- DSS_DEBUG_LOG("tvp: %p, tv_sec : %lu\n", tvp, (long unsigned) tv.tv_sec);
ret = dss_select(signal_pipe + 1, &rfds, NULL, tvp);
if (ret < 0)
goto out;
case HS_POST_RUNNING:
continue;
case HS_PRE_SUCCESS:
- free_rsync_argv(rsync_argv);
- create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
- /* fall through */
+ if (!name_of_reference_snapshot) {
+ free_rsync_argv(rsync_argv);
+ create_rsync_argv(&rsync_argv, ¤t_snapshot_creation_time);
+ }
+ ret = create_snapshot(rsync_argv);
+ if (ret < 0)
+ goto out;
+ continue;
case HS_NEEDS_RESTART:
+ if (!next_snapshot_is_due())
+ continue;
ret = create_snapshot(rsync_argv);
if (ret < 0)
goto out;
char *argv[] = {conf.exit_hook_arg, dss_strerror(-exit_code), NULL};
pid_t pid;
- if (!conf.exit_hook_given)
- return;
DSS_NOTICE_LOG("executing %s %s\n", argv[0], argv[1]);
dss_exec(&pid, conf.exit_hook_arg, argv, fds);
}
ret = parse_config_file(0);
if (ret < 0)
goto out;
+ if (ret == 0) { /* no config file given */
+ /*
+ * Parse the command line options again, but this time check
+ * that all required options are given.
+ */
+ params = (struct cmdline_parser_params) {
+ .override = 1,
+ .initialize = 1,
+ .check_required = 1,
+ .check_ambiguity = 1,
+ .print_errors = 1
+ };
+ cmdline_parser_ext(argc, argv, &conf, ¶ms); /* aborts on errors */
+ }
if (conf.daemon_given)
daemon_init();
ret = change_to_dest_dir();
if (ret < 0)
goto out;
+ dump_dss_config("startup");
ret = setup_signal_handling();
if (ret < 0)
goto out;
projects / dss.git / blobdiff