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trans_logger: fix potential race on log_input 

During logrotate, there may exist writeback clusters
with mixed log_inputs. Each sub_mref now gets its individual
log_input inherited from the orig_mref. Add ref counting
to ensure that cleanup can never occur on an active log_input.
This commit is contained in:
Thomas Schoebel-Theuer 2012-12-31 10:33:47 +01:00
parent 51fe58aeac
commit 28d433cc81
3 changed files with 49 additions and 17 deletions
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45
mars_trans_logger.c
View File

@ -974,9 +974,12 @@ void pos_complete(struct trans_logger_mref_aspect *orig_mref_a)
// am I the first member? (means "youngest" list entry)
if (tmp == log_input->pos_list.next) {
MARS_IO("first_finished = %lld\n", finished);
if (finished <= log_input->inf.inf_min_pos) {
if (unlikely(finished <= log_input->inf.inf_min_pos)) {
MARS_ERR("backskip in log writeback: %lld -> %lld\n", log_input->inf.inf_min_pos, finished);
}
if (unlikely(finished > log_input->inf.inf_max_pos)) {
MARS_ERR("min_pos > max_pos: %lld > %lld\n", finished, log_input->inf.inf_max_pos);
}
log_input->inf.inf_min_pos = finished;
get_lamport(&log_input->inf.inf_min_pos_stamp);
_inf_callback(log_input, false);
@ -1078,6 +1081,7 @@ void wb_endio(struct generic_callback *cb)
} else {
MARS_ERR("internal: no endio defined\n");
}
done:
wake_up_interruptible_all(&brick->worker_event);
return;
@ -1093,7 +1097,7 @@ err:
* point in time.
*/
static noinline
struct writeback_info *make_writeback(struct trans_logger_brick *brick, loff_t pos, int len, struct timespec *elder, struct trans_logger_input *log_input)
struct writeback_info *make_writeback(struct trans_logger_brick *brick, loff_t pos, int len, struct timespec *elder)
{
struct writeback_info *wb;
struct trans_logger_input *read_input;
@ -1147,6 +1151,7 @@ struct writeback_info *make_writeback(struct trans_logger_brick *brick, loff_t p
while (len > 0) {
struct trans_logger_mref_aspect *sub_mref_a;
struct mref_object *sub_mref;
struct trans_logger_input *log_input;
int this_len;
int status;
@ -1167,7 +1172,9 @@ struct writeback_info *make_writeback(struct trans_logger_brick *brick, loff_t p
CHECK_ASPECT(sub_mref_a, sub_mref, err);
sub_mref_a->my_input = read_input;
log_input = brick->inputs[brick->log_input_nr];
sub_mref_a->log_input = log_input;
atomic_inc(&log_input->log_ref_count);
sub_mref_a->my_brick = brick;
sub_mref_a->orig_rw = READ;
sub_mref_a->wb = wb;
@ -1199,6 +1206,7 @@ struct writeback_info *make_writeback(struct trans_logger_brick *brick, loff_t p
struct mref_object *sub_mref;
struct trans_logger_mref_aspect *orig_mref_a;
struct mref_object *orig_mref;
struct trans_logger_input *log_input;
void *data;
int this_len = len;
int diff;
@ -1238,7 +1246,9 @@ struct writeback_info *make_writeback(struct trans_logger_brick *brick, loff_t p
sub_mref_a->orig_mref_a = orig_mref_a;
sub_mref_a->my_input = write_input;
log_input = orig_mref_a->log_input;
sub_mref_a->log_input = log_input;
atomic_inc(&log_input->log_ref_count);
sub_mref_a->my_brick = brick;
sub_mref_a->orig_rw = WRITE;
sub_mref_a->wb = wb;
@ -1275,7 +1285,6 @@ void _fire_one(struct list_head *tmp, bool do_update)
struct trans_logger_mref_aspect *sub_mref_a;
struct mref_object *sub_mref;
struct trans_logger_input *sub_input;
struct trans_logger_input *log_input;
sub_mref_a = container_of(tmp, struct trans_logger_mref_aspect, sub_head);
sub_mref = sub_mref_a->object;
@ -1288,16 +1297,21 @@ void _fire_one(struct list_head *tmp, bool do_update)
SETUP_CALLBACK(sub_mref, wb_endio, sub_mref_a);
sub_input = sub_mref_a->my_input;
log_input = sub_mref_a->log_input;
if (do_update) {
struct trans_logger_mref_aspect *orig_mref_a = sub_mref_a->orig_mref_a;
if (unlikely(!orig_mref_a)) {
MARS_ERR("internal problem\n");
} else {
loff_t max_pos = orig_mref_a->log_pos;
struct trans_logger_input *log_input;
log_input = orig_mref_a->log_input;
if (unlikely(!log_input)) {
MARS_ERR("internal problem\n");
} else {
down(&log_input->inf_mutex);
if (unlikely(max_pos < log_input->inf.inf_min_pos)) {
MARS_ERR("new max_pos < min_pos: %lld < %lld\n", max_pos, log_input->inf.inf_min_pos);
}
if (log_input->inf.inf_max_pos < max_pos) {
log_input->inf.inf_max_pos = max_pos;
get_lamport(&log_input->inf.inf_max_pos_stamp);
@ -1306,6 +1320,9 @@ void _fire_one(struct list_head *tmp, bool do_update)
up(&log_input->inf_mutex);
}
}
}
sub_input = sub_mref_a->my_input;
#ifdef DO_WRITEBACK
GENERIC_INPUT_CALL(sub_input, mref_io, sub_mref);
@ -1453,9 +1470,8 @@ bool phase0_startio(struct trans_logger_mref_aspect *orig_mref_a)
CHECK_PTR(orig_mref, err);
brick = orig_mref_a->my_brick;
CHECK_PTR(brick, err);
input = brick->inputs[brick->log_input_nr];
input = orig_mref_a->log_input;
CHECK_PTR(input, err);
orig_mref_a->log_input = input;
logst = &input->logst;
logst->do_crc = trans_logger_do_crc;
@ -1576,7 +1592,11 @@ bool prep_phase_startio(struct trans_logger_mref_aspect *mref_a)
}
#endif
if (likely(!mref_a->is_hashed)) {
struct trans_logger_input *log_input;
log_input = brick->inputs[brick->log_input_nr];
MARS_IO("hashing %d at %lld\n", mref->ref_len, mref->ref_pos);
mref_a->log_input = log_input;
atomic_inc(&log_input->log_ref_count);
hash_insert(brick, mref_a);
} else {
MARS_ERR("tried to hash twice\n");
@ -1656,7 +1676,7 @@ bool phase1_startio(struct trans_logger_mref_aspect *orig_mref_a)
goto done;
}
wb = make_writeback(brick, orig_mref->ref_pos, orig_mref->ref_len, &orig_mref_a->stamp, orig_mref_a->log_input);
wb = make_writeback(brick, orig_mref->ref_pos, orig_mref->ref_len, &orig_mref_a->stamp);
if (unlikely(!wb)) {
MARS_ERR("no mem\n");
goto err;
@ -2872,6 +2892,8 @@ char *trans_logger_statistics(struct trans_logger_brick *brick, int verbose)
"hash_count=%d "
"pos_count=%d "
"balance=%d/%d/%d/%d "
"log_refs1=%d "
"log_refs2=%d "
"fly=%d "
"mref_flying1=%d "
"mref_flying2=%d "
@ -2932,6 +2954,8 @@ char *trans_logger_statistics(struct trans_logger_brick *brick, int verbose)
atomic_read(&brick->inner_balance_count),
atomic_read(&brick->outer_balance_count),
atomic_read(&brick->wb_balance_count),
atomic_read(&brick->inputs[TL_INPUT_LOG1]->log_ref_count),
atomic_read(&brick->inputs[TL_INPUT_LOG2]->log_ref_count),
atomic_read(&brick->fly_count),
atomic_read(&brick->inputs[TL_INPUT_LOG1]->logst.mref_flying),
atomic_read(&brick->inputs[TL_INPUT_LOG2]->logst.mref_flying),
@ -3007,6 +3031,9 @@ void trans_logger_mref_aspect_exit_fn(struct generic_aspect *_ini)
CHECK_HEAD_EMPTY(&ini->collect_head);
CHECK_HEAD_EMPTY(&ini->sub_list);
CHECK_HEAD_EMPTY(&ini->sub_head);
if (ini->log_input) {
atomic_dec(&ini->log_input->log_ref_count);
}
}
MARS_MAKE_STATICS(trans_logger);

1
mars_trans_logger.h
View File

@ -233,6 +233,7 @@ struct trans_logger_input {
// informational
struct trans_logger_info inf;
// readonly from outside
atomic_t log_ref_count;
bool is_operating;
long long last_jiffies;

8
sy_old/mars_light.c
View File

@ -2175,11 +2175,15 @@ void _rotate_trans(struct mars_rotate *rot)
// try to cleanup old log
if (log_nr != old_nr) {
struct trans_logger_input *trans_input = trans_brick->inputs[old_nr];
struct trans_logger_input *new_input = trans_brick->inputs[log_nr];
if (!trans_input->connect) {
MARS_DBG("ignoring unused input %d\n", old_nr);
MARS_DBG("ignoring unused old input %d\n", old_nr);
} else if (!new_input->is_operating) {
MARS_DBG("ignoring uninitialized new input %d\n", log_nr);
} else if (trans_input->is_operating &&
trans_input->inf.inf_min_pos == trans_input->inf.inf_max_pos &&
list_empty(&trans_input->pos_list)) {
list_empty(&trans_input->pos_list) &&
atomic_read(&trans_input->log_ref_count) <= 0) {
int status;
MARS_INF("cleanup old transaction log (%d -> %d)\n", old_nr, log_nr);
status = generic_disconnect((void*)trans_input);