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fix crash in mars_copy (wait for IO completion)

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Thomas Schoebel-Theuer 2012-01-22 18:18:39 +01:00 committed by Thomas Schoebel-Theuer
parent 67c7e646d2
commit b25d5a84a8
2 changed files with 39 additions and 18 deletions
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56
mars_copy.c
View File

@ -227,6 +227,16 @@ void _clear_mref(struct copy_brick *brick, int index, int queue)
}
}
static
void _clear_all_mref(struct copy_brick *brick)
{
int i;
for (i = 0; i < MAX_COPY_PARA; i++) {
_clear_mref(brick, i, 0);
_clear_mref(brick, i, 1);
}
}
static
void _update_percent(struct copy_brick *brick)
{
@ -269,6 +279,8 @@ int _next_state(struct copy_brick *brick, int index, loff_t pos)
st->active[0] = false;
st->active[1] = false;
st->error = 0;
if (brick->is_aborting || kthread_should_stop())
goto done;
i = 0;
next_state = COPY_STATE_READ1;
if (brick->verify_mode) {
@ -334,6 +346,8 @@ int _next_state(struct copy_brick *brick, int index, loff_t pos)
status = -EILSEQ;
goto done;
}
if (brick->is_aborting || kthread_should_stop())
goto done;
/* start writeout */
status = _make_mref(brick, index, 1, mref0->ref_data, pos, 1);
next_state = COPY_STATE_WRITTEN;
@ -381,9 +395,8 @@ int _run_copy(struct copy_brick *brick)
int res_status = 0;
if (unlikely(_clear_clash(brick))) {
int i;
MARS_DBG("clash\n");
if (atomic_read(&brick->copy_flight)) {
if (atomic_read(&brick->copy_flight) > 0) {
/* wait until all pending copy IO has finished
*/
_clash(brick);
@ -391,10 +404,7 @@ int _run_copy(struct copy_brick *brick)
msleep(100);
return 0;
}
for (i = 0; i < MAX_COPY_PARA; i++) {
_clear_mref(brick, i, 0);
_clear_mref(brick, i, 1);
}
_clear_all_mref(brick);
memset(brick->st, 0, sizeof(brick->st));
}
@ -409,7 +419,7 @@ int _run_copy(struct copy_brick *brick)
struct copy_state *st = &brick->st[index];
//MARS_IO("pos = %lld\n", pos);
if (brick->clash || max-- <= 0 || kthread_should_stop()) {
if (max-- <= 0) {
break;
}
st->prev = prev;
@ -452,6 +462,13 @@ int _run_copy(struct copy_brick *brick)
return res_status;
}
static
bool _is_done(struct copy_brick *brick)
{
return (brick->is_aborting || kthread_should_stop())
&& atomic_read(&brick->copy_flight) <= 0;
}
static int _copy_thread(void *data)
{
struct copy_brick *brick = data;
@ -461,30 +478,30 @@ static int _copy_thread(void *data)
mars_power_led_on((void*)brick, true);
brick->trigger = true;
while (!kthread_should_stop()) {
while (!_is_done(brick)) {
loff_t old_start = brick->copy_start;
loff_t old_end = brick->copy_end;
if (old_end > 0) {
int status = _run_copy(brick);
if (unlikely(status < 0)) {
brick->copy_error = status;
if (brick->abort_mode) {
if (brick->abort_mode && !brick->is_aborting) {
MARS_INF("IO error, terminating prematurely, status = %d\n", status);
break;
brick->is_aborting = true;
}
}
msleep(10); // yield FIXME: remove this, use event handling for over/underflow
}
wait_event_interruptible_timeout(brick->event,
brick->trigger || brick->copy_start != old_start || brick->copy_end != old_end || kthread_should_stop(),
brick->trigger || brick->copy_start != old_start || brick->copy_end != old_end || _is_done(brick),
1 * HZ);
brick->trigger = false;
}
MARS_DBG("--------------- copy_thread terminating (%d requests flying)\n", atomic_read(&brick->copy_flight));
wait_event_interruptible_timeout(brick->event, !atomic_read(&brick->copy_flight), 300 * HZ);
MARS_DBG("--------------- copy_thread terminating (%d requests flying, copy_start = %lld copy_end = %lld)\n", atomic_read(&brick->copy_flight), brick->copy_start, brick->copy_end);
_clear_all_mref(brick);
mars_power_led_off((void*)brick, true);
MARS_DBG("--------------- copy_thread done.\n");
return 0;
@ -541,6 +558,7 @@ static int copy_switch(struct copy_brick *brick)
MARS_DBG("power.button = %d\n", brick->power.button);
if (brick->power.button) {
mars_power_led_off((void*)brick, false);
brick->is_aborting = false;
if (!brick->thread) {
brick->copy_last = brick->copy_start;
brick->thread = kthread_create(_copy_thread, brick, "mars_copy%d", version++);
@ -573,13 +591,15 @@ static int copy_switch(struct copy_brick *brick)
static
char *copy_statistics(struct copy_brick *brick, int verbose)
{
char *res = brick_string_alloc(0);
char *res = brick_string_alloc(1024);
if (!res)
return NULL;
snprintf(res, 512, "copy_start = %lld copy_last = %lld copy_end = %lld clash = %lu | io_flight = %d copy_flight = %d\n",
brick->copy_start, brick->copy_last, brick->copy_end, brick->clash,
atomic_read(&brick->io_flight), atomic_read(&brick->copy_flight));
snprintf(res, 1024,
"copy_start = %lld copy_last = %lld copy_end = %lld copy_error = %d low_dirty = %d is_aborting = %d clash = %lu | io_flight = %d copy_flight = %d\n",
brick->copy_start, brick->copy_last, brick->copy_end,
brick->copy_error, brick->low_dirty, brick->is_aborting, brick->clash,
atomic_read(&brick->io_flight), atomic_read(&brick->copy_flight));
return res;
}

1
mars_copy.h
View File

@ -53,6 +53,7 @@ struct copy_brick {
loff_t copy_last; // current working position
int copy_error;
bool low_dirty;
bool is_aborting;
// internal
volatile bool trigger;
volatile unsigned long clash;