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path: root/drivers/block/drbd/drbd_worker.c
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Diffstat (limited to 'drivers/block/drbd/drbd_worker.c')
-rw-r--r--drivers/block/drbd/drbd_worker.c107
1 files changed, 55 insertions, 52 deletions
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 2c4ce42c3657..d8f57b6305cd 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -118,7 +118,7 @@ static void drbd_endio_read_sec_final(struct drbd_peer_request *peer_req) __rele
/* writes on behalf of the partner, or resync writes,
* "submitted" by the receiver, final stage. */
-static void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local)
+void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __releases(local)
{
unsigned long flags = 0;
struct drbd_peer_device *peer_device = peer_req->peer_device;
@@ -150,7 +150,9 @@ static void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req) __rel
do_wake = list_empty(block_id == ID_SYNCER ? &device->sync_ee : &device->active_ee);
- if (test_bit(__EE_WAS_ERROR, &peer_req->flags))
+ /* FIXME do we want to detach for failed REQ_DISCARD?
+ * ((peer_req->flags & (EE_WAS_ERROR|EE_IS_TRIM)) == EE_WAS_ERROR) */
+ if (peer_req->flags & EE_WAS_ERROR)
__drbd_chk_io_error(device, DRBD_WRITE_ERROR);
spin_unlock_irqrestore(&device->resource->req_lock, flags);
@@ -176,10 +178,12 @@ void drbd_peer_request_endio(struct bio *bio, int error)
struct drbd_device *device = peer_req->peer_device->device;
int uptodate = bio_flagged(bio, BIO_UPTODATE);
int is_write = bio_data_dir(bio) == WRITE;
+ int is_discard = !!(bio->bi_rw & REQ_DISCARD);
if (error && __ratelimit(&drbd_ratelimit_state))
drbd_warn(device, "%s: error=%d s=%llus\n",
- is_write ? "write" : "read", error,
+ is_write ? (is_discard ? "discard" : "write")
+ : "read", error,
(unsigned long long)peer_req->i.sector);
if (!error && !uptodate) {
if (__ratelimit(&drbd_ratelimit_state))
@@ -263,7 +267,12 @@ void drbd_request_endio(struct bio *bio, int error)
/* to avoid recursion in __req_mod */
if (unlikely(error)) {
- what = (bio_data_dir(bio) == WRITE)
+ if (bio->bi_rw & REQ_DISCARD)
+ what = (error == -EOPNOTSUPP)
+ ? DISCARD_COMPLETED_NOTSUPP
+ : DISCARD_COMPLETED_WITH_ERROR;
+ else
+ what = (bio_data_dir(bio) == WRITE)
? WRITE_COMPLETED_WITH_ERROR
: (bio_rw(bio) == READ)
? READ_COMPLETED_WITH_ERROR
@@ -395,7 +404,7 @@ static int read_for_csum(struct drbd_peer_device *peer_device, sector_t sector,
/* GFP_TRY, because if there is no memory available right now, this may
* be rescheduled for later. It is "only" background resync, after all. */
peer_req = drbd_alloc_peer_req(peer_device, ID_SYNCER /* unused */, sector,
- size, GFP_TRY);
+ size, true /* has real payload */, GFP_TRY);
if (!peer_req)
goto defer;
@@ -492,10 +501,9 @@ struct fifo_buffer *fifo_alloc(int fifo_size)
return fb;
}
-static int drbd_rs_controller(struct drbd_device *device)
+static int drbd_rs_controller(struct drbd_device *device, unsigned int sect_in)
{
struct disk_conf *dc;
- unsigned int sect_in; /* Number of sectors that came in since the last turn */
unsigned int want; /* The number of sectors we want in the proxy */
int req_sect; /* Number of sectors to request in this turn */
int correction; /* Number of sectors more we need in the proxy*/
@@ -505,9 +513,6 @@ static int drbd_rs_controller(struct drbd_device *device)
int max_sect;
struct fifo_buffer *plan;
- sect_in = atomic_xchg(&device->rs_sect_in, 0); /* Number of sectors that came in */
- device->rs_in_flight -= sect_in;
-
dc = rcu_dereference(device->ldev->disk_conf);
plan = rcu_dereference(device->rs_plan_s);
@@ -550,11 +555,16 @@ static int drbd_rs_controller(struct drbd_device *device)
static int drbd_rs_number_requests(struct drbd_device *device)
{
- int number;
+ unsigned int sect_in; /* Number of sectors that came in since the last turn */
+ int number, mxb;
+
+ sect_in = atomic_xchg(&device->rs_sect_in, 0);
+ device->rs_in_flight -= sect_in;
rcu_read_lock();
+ mxb = drbd_get_max_buffers(device) / 2;
if (rcu_dereference(device->rs_plan_s)->size) {
- number = drbd_rs_controller(device) >> (BM_BLOCK_SHIFT - 9);
+ number = drbd_rs_controller(device, sect_in) >> (BM_BLOCK_SHIFT - 9);
device->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME;
} else {
device->c_sync_rate = rcu_dereference(device->ldev->disk_conf)->resync_rate;
@@ -562,8 +572,14 @@ static int drbd_rs_number_requests(struct drbd_device *device)
}
rcu_read_unlock();
- /* ignore the amount of pending requests, the resync controller should
- * throttle down to incoming reply rate soon enough anyways. */
+ /* Don't have more than "max-buffers"/2 in-flight.
+ * Otherwise we may cause the remote site to stall on drbd_alloc_pages(),
+ * potentially causing a distributed deadlock on congestion during
+ * online-verify or (checksum-based) resync, if max-buffers,
+ * socket buffer sizes and resync rate settings are mis-configured. */
+ if (mxb - device->rs_in_flight < number)
+ number = mxb - device->rs_in_flight;
+
return number;
}
@@ -597,7 +613,7 @@ static int make_resync_request(struct drbd_device *device, int cancel)
max_bio_size = queue_max_hw_sectors(device->rq_queue) << 9;
number = drbd_rs_number_requests(device);
- if (number == 0)
+ if (number <= 0)
goto requeue;
for (i = 0; i < number; i++) {
@@ -647,7 +663,7 @@ next_sector:
*/
align = 1;
rollback_i = i;
- for (;;) {
+ while (i < number) {
if (size + BM_BLOCK_SIZE > max_bio_size)
break;
@@ -1670,11 +1686,15 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
}
clear_bit(B_RS_H_DONE, &device->flags);
- write_lock_irq(&global_state_lock);
+ /* req_lock: serialize with drbd_send_and_submit() and others
+ * global_state_lock: for stable sync-after dependencies */
+ spin_lock_irq(&device->resource->req_lock);
+ write_lock(&global_state_lock);
/* Did some connection breakage or IO error race with us? */
if (device->state.conn < C_CONNECTED
|| !get_ldev_if_state(device, D_NEGOTIATING)) {
- write_unlock_irq(&global_state_lock);
+ write_unlock(&global_state_lock);
+ spin_unlock_irq(&device->resource->req_lock);
mutex_unlock(device->state_mutex);
return;
}
@@ -1714,7 +1734,8 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
}
_drbd_pause_after(device);
}
- write_unlock_irq(&global_state_lock);
+ write_unlock(&global_state_lock);
+ spin_unlock_irq(&device->resource->req_lock);
if (r == SS_SUCCESS) {
/* reset rs_last_bcast when a resync or verify is started,
@@ -1778,34 +1799,6 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
mutex_unlock(device->state_mutex);
}
-/* If the resource already closed the current epoch, but we did not
- * (because we have not yet seen new requests), we should send the
- * corresponding barrier now. Must be checked within the same spinlock
- * that is used to check for new requests. */
-static bool need_to_send_barrier(struct drbd_connection *connection)
-{
- if (!connection->send.seen_any_write_yet)
- return false;
-
- /* Skip barriers that do not contain any writes.
- * This may happen during AHEAD mode. */
- if (!connection->send.current_epoch_writes)
- return false;
-
- /* ->req_lock is held when requests are queued on
- * connection->sender_work, and put into ->transfer_log.
- * It is also held when ->current_tle_nr is increased.
- * So either there are already new requests queued,
- * and corresponding barriers will be send there.
- * Or nothing new is queued yet, so the difference will be 1.
- */
- if (atomic_read(&connection->current_tle_nr) !=
- connection->send.current_epoch_nr + 1)
- return false;
-
- return true;
-}
-
static bool dequeue_work_batch(struct drbd_work_queue *queue, struct list_head *work_list)
{
spin_lock_irq(&queue->q_lock);
@@ -1864,12 +1857,22 @@ static void wait_for_work(struct drbd_connection *connection, struct list_head *
spin_unlock_irq(&connection->resource->req_lock);
break;
}
- send_barrier = need_to_send_barrier(connection);
+
+ /* We found nothing new to do, no to-be-communicated request,
+ * no other work item. We may still need to close the last
+ * epoch. Next incoming request epoch will be connection ->
+ * current transfer log epoch number. If that is different
+ * from the epoch of the last request we communicated, it is
+ * safe to send the epoch separating barrier now.
+ */
+ send_barrier =
+ atomic_read(&connection->current_tle_nr) !=
+ connection->send.current_epoch_nr;
spin_unlock_irq(&connection->resource->req_lock);
- if (send_barrier) {
- drbd_send_barrier(connection);
- connection->send.current_epoch_nr++;
- }
+
+ if (send_barrier)
+ maybe_send_barrier(connection,
+ connection->send.current_epoch_nr + 1);
schedule();
/* may be woken up for other things but new work, too,
* e.g. if the current epoch got closed.
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-31 05:33:38 +0000