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main: fix primary versionlink after crash

This commit is contained in:
Thomas Schoebel-Theuer 2019-11-04 21:16:15 +01:00
parent da49d46dac
commit 9ab6c1f603
1 changed files with 42 additions and 0 deletions
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42
kernel/sy_old/mars_main.c
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@ -645,6 +645,8 @@ struct mars_rotate {
bool forbid_replay;
bool replay_mode;
bool todo_primary;
bool checked_reboot;
bool recover_versionlink;
bool is_primary;
bool old_is_primary;
bool created_hole;
@ -1414,6 +1416,25 @@ void write_info_links(struct mars_rotate *rot)
}
}
static
void _recover_versionlink(struct mars_rotate *rot, int sequence, loff_t end_pos)
{
struct trans_logger_info inf = {
.inf_private = rot,
.inf_sequence = sequence,
.inf_min_pos = 0,
.inf_max_pos = 0,
.inf_log_pos = end_pos,
.inf_is_replaying = false,
};
strncpy(inf.inf_host, my_id(), sizeof(inf.inf_host));
MARS_DBG("sequence = %d end_pos = %lld\n",
sequence, end_pos);
_update_version_link(rot, &inf);
}
static
void _make_new_replaylink(struct mars_rotate *rot, char *new_host, int new_sequence, loff_t end_pos)
{
@ -3664,6 +3685,12 @@ int _make_logging_status(struct mars_rotate *rot)
if (dent->d_serial > log_nr)
log_nr = dent->d_serial;
MARS_INF_TO(rot->log_say, "preparing new transaction log, number moves from %d to %d\n", dent->d_serial, log_nr + 1);
if (unlikely(rot->recover_versionlink)) {
rot->recover_versionlink = false;
if (rot->aio_dent && rot->aio_dent->d_rest &&
!strcmp(rot->aio_dent->d_rest, my_id()))
_recover_versionlink(rot, log_nr, end_pos);
}
_make_new_replaylink(rot, my_id(), log_nr + 1, 0);
} else {
MARS_DBG("nothing to do on last transaction log '%s'\n", dent->d_path);
@ -3696,6 +3723,7 @@ ok:
rot->next_log = dent;
done:
rot->recover_versionlink = false;
if (status < 0) {
MARS_DBG("rot_error status = %d\n", status);
rot->has_error = true;
@ -4265,6 +4293,20 @@ int make_primary(void *buf, struct mars_dent *dent)
rot->todo_primary =
global->global_power.button && dent->new_link && !strcmp(dent->new_link, my_id());
MARS_DBG("todo_primary = %d is_primary = %d\n", rot->todo_primary, rot->is_primary);
/* The primary versionlink needs to be ahead of the synced part of
* the logfile. When the primary crashes, it may point to a position
* which was never written to disk.
* Ensure that after reboot the primary will exceptionally re-consider
* versionlink updating.
*/
if (unlikely(!rot->checked_reboot)) {
rot->checked_reboot = true;
if (rot->todo_primary)
rot->recover_versionlink = true;
MARS_DBG("recover_versionlink = %d\n",
rot->recover_versionlink);
}
status = 0;
done: