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drbd: fix resync throttling initialization

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If for some reason DRBD resync was the only activity on a backend
device, drbd_rs_c_min_rate_throttle() would mistakenly decide that it is
still initialization time, and keep throttling the resync.

This patch explicitly initializes ->rs_last_events to the current
backend event counters, and drops the rs_last_events == 0 from the
throttle condition.

Reported-by: Mikhail Sugakov <msugakov@amazon.de>

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Lars Ellenberg 2014-11-10 17:21:12 +01:00 committed by Jens Axboe
parent a88215312c
commit ff8bd88b73
3 changed files with 5 additions and 3 deletions
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2
drivers/block/drbd/drbd_receiver.c
View File

@ -2482,7 +2482,7 @@ bool drbd_rs_c_min_rate_throttle(struct drbd_device *device)
atomic_read(&device->rs_sect_ev);
if (atomic_read(&device->ap_actlog_cnt)
|| !device->rs_last_events || curr_events - device->rs_last_events > 64) {
|| curr_events - device->rs_last_events > 64) {
unsigned long rs_left;
int i;

1
drivers/block/drbd/drbd_state.c
View File

@ -1099,7 +1099,6 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
set_ov_position(device, ns.conn);
device->rs_start = now;
device->rs_last_events = 0;
device->rs_last_sect_ev = 0;
device->ov_last_oos_size = 0;
device->ov_last_oos_start = 0;

5
drivers/block/drbd/drbd_worker.c
View File

@ -1592,11 +1592,15 @@ void drbd_resync_after_changed(struct drbd_device *device)
void drbd_rs_controller_reset(struct drbd_device *device)
{
struct gendisk *disk = device->ldev->backing_bdev->bd_contains->bd_disk;
struct fifo_buffer *plan;
atomic_set(&device->rs_sect_in, 0);
atomic_set(&device->rs_sect_ev, 0);
device->rs_in_flight = 0;
device->rs_last_events =
(int)part_stat_read(&disk->part0, sectors[0]) +
(int)part_stat_read(&disk->part0, sectors[1]);
/* Updating the RCU protected object in place is necessary since
this function gets called from atomic context.
@ -1743,7 +1747,6 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
device->rs_failed = 0;
device->rs_paused = 0;
device->rs_same_csum = 0;
device->rs_last_events = 0;
device->rs_last_sect_ev = 0;
device->rs_total = tw;
device->rs_start = now;