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From:   =?UTF-8?q?Christoph=20B=C3=B6hmwalder?= 
        <christoph.boehmwalder@linbit.com>
To:     Jens Axboe <axboe@kernel.dk>
Cc:     drbd-dev@lists.linbit.com, linux-kernel@vger.kernel.org,
        Lars Ellenberg <lars.ellenberg@linbit.com>,
        Philipp Reisner <philipp.reisner@linbit.com>,
        linux-block@vger.kernel.org,
        =?UTF-8?q?Christoph=20B=C3=B6hmwalder?= 
        <christoph.boehmwalder@linbit.com>
Subject: [PATCH v3 6/7] drbd: pass drbd_peer_device to __req_mod
Date:   Thu, 30 Mar 2023 12:27:43 +0200
Message-Id: <20230330102744.2128122-7-christoph.boehmwalder@linbit.com>
In-Reply-To: <20230330102744.2128122-1-christoph.boehmwalder@linbit.com>
References: <20230330102744.2128122-1-christoph.boehmwalder@linbit.com>
MIME-Version: 1.0
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Precedence: bulk

In preparation to support multiple connections, we need to know which
one we need to modify the request state for.

Originally-from: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
---
 drivers/block/drbd/drbd_main.c     | 13 +++++++++----
 drivers/block/drbd/drbd_receiver.c | 18 ++++++++++--------
 drivers/block/drbd/drbd_req.c      | 21 +++++++++++++--------
 drivers/block/drbd/drbd_req.h      | 11 +++++++----
 drivers/block/drbd/drbd_worker.c   | 14 +++++++-------
 5 files changed, 46 insertions(+), 31 deletions(-)

diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 6647f84f3879..83987e7a5ef2 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -231,9 +231,11 @@ void tl_release(struct drbd_connection *connection, unsigned int barrier_nr,
 		}
 	req = list_prepare_entry(tmp, &connection->transfer_log, tl_requests);
 	list_for_each_entry_safe_from(req, r, &connection->transfer_log, tl_requests) {
+		struct drbd_peer_device *peer_device;
 		if (req->epoch != expect_epoch)
 			break;
-		_req_mod(req, BARRIER_ACKED);
+		peer_device = conn_peer_device(connection, req->device->vnr);
+		_req_mod(req, BARRIER_ACKED, peer_device);
 	}
 	spin_unlock_irq(&connection->resource->req_lock);
 
@@ -256,10 +258,13 @@ void tl_release(struct drbd_connection *connection, unsigned int barrier_nr,
 /* must hold resource->req_lock */
 void _tl_restart(struct drbd_connection *connection, enum drbd_req_event what)
 {
+	struct drbd_peer_device *peer_device;
 	struct drbd_request *req, *r;
 
-	list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests)
-		_req_mod(req, what);
+	list_for_each_entry_safe(req, r, &connection->transfer_log, tl_requests) {
+		peer_device = conn_peer_device(connection, req->device->vnr);
+		_req_mod(req, what, peer_device);
+	}
 }
 
 void tl_restart(struct drbd_connection *connection, enum drbd_req_event what)
@@ -297,7 +302,7 @@ void tl_abort_disk_io(struct drbd_device *device)
 			continue;
 		if (req->device != device)
 			continue;
-		_req_mod(req, ABORT_DISK_IO);
+		_req_mod(req, ABORT_DISK_IO, NULL);
 	}
 	spin_unlock_irq(&connection->resource->req_lock);
 }
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index e352880c70b5..856c0e3a6630 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -2138,7 +2138,7 @@ static int receive_DataReply(struct drbd_connection *connection, struct packet_i
 
 	err = recv_dless_read(peer_device, req, sector, pi->size);
 	if (!err)
-		req_mod(req, DATA_RECEIVED);
+		req_mod(req, DATA_RECEIVED, peer_device);
 	/* else: nothing. handled from drbd_disconnect...
 	 * I don't think we may complete this just yet
 	 * in case we are "on-disconnect: freeze" */
@@ -2196,7 +2196,7 @@ static void restart_conflicting_writes(struct drbd_device *device,
 			continue;
 		/* as it is RQ_POSTPONED, this will cause it to
 		 * be queued on the retry workqueue. */
-		__req_mod(req, CONFLICT_RESOLVED, NULL);
+		__req_mod(req, CONFLICT_RESOLVED, NULL, NULL);
 	}
 }
 
@@ -2420,6 +2420,7 @@ static blk_opf_t wire_flags_to_bio(struct drbd_connection *connection, u32 dpf)
 static void fail_postponed_requests(struct drbd_device *device, sector_t sector,
 				    unsigned int size)
 {
+	struct drbd_peer_device *peer_device = first_peer_device(device);
 	struct drbd_interval *i;
 
     repeat:
@@ -2433,7 +2434,7 @@ static void fail_postponed_requests(struct drbd_device *device, sector_t sector,
 		if (!(req->rq_state & RQ_POSTPONED))
 			continue;
 		req->rq_state &= ~RQ_POSTPONED;
-		__req_mod(req, NEG_ACKED, &m);
+		__req_mod(req, NEG_ACKED, peer_device, &m);
 		spin_unlock_irq(&device->resource->req_lock);
 		if (m.bio)
 			complete_master_bio(device, &m);
@@ -5661,10 +5662,11 @@ static int got_IsInSync(struct drbd_connection *connection, struct packet_info *
 }
 
 static int
-validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t sector,
+validate_req_change_req_state(struct drbd_peer_device *peer_device, u64 id, sector_t sector,
 			      struct rb_root *root, const char *func,
 			      enum drbd_req_event what, bool missing_ok)
 {
+	struct drbd_device *device = peer_device->device;
 	struct drbd_request *req;
 	struct bio_and_error m;
 
@@ -5674,7 +5676,7 @@ validate_req_change_req_state(struct drbd_device *device, u64 id, sector_t secto
 		spin_unlock_irq(&device->resource->req_lock);
 		return -EIO;
 	}
-	__req_mod(req, what, &m);
+	__req_mod(req, what, peer_device, &m);
 	spin_unlock_irq(&device->resource->req_lock);
 
 	if (m.bio)
@@ -5723,7 +5725,7 @@ static int got_BlockAck(struct drbd_connection *connection, struct packet_info *
 		BUG();
 	}
 
-	return validate_req_change_req_state(device, p->block_id, sector,
+	return validate_req_change_req_state(peer_device, p->block_id, sector,
 					     &device->write_requests, __func__,
 					     what, false);
 }
@@ -5750,7 +5752,7 @@ static int got_NegAck(struct drbd_connection *connection, struct packet_info *pi
 		return 0;
 	}
 
-	err = validate_req_change_req_state(device, p->block_id, sector,
+	err = validate_req_change_req_state(peer_device, p->block_id, sector,
 					    &device->write_requests, __func__,
 					    NEG_ACKED, true);
 	if (err) {
@@ -5781,7 +5783,7 @@ static int got_NegDReply(struct drbd_connection *connection, struct packet_info
 	drbd_err(device, "Got NegDReply; Sector %llus, len %u.\n",
 	    (unsigned long long)sector, be32_to_cpu(p->blksize));
 
-	return validate_req_change_req_state(device, p->block_id, sector,
+	return validate_req_change_req_state(peer_device, p->block_id, sector,
 					     &device->read_requests, __func__,
 					     NEG_ACKED, false);
 }
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index e36216d50753..528f29ebf369 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -552,12 +552,15 @@ static inline bool is_pending_write_protocol_A(struct drbd_request *req)
  *  happen "atomically" within the req_lock,
  *  and it enforces that we have to think in a very structured manner
  *  about the "events" that may happen to a request during its life time ...
+ *
+ *
+ * peer_device == NULL means local disk
  */
 int __req_mod(struct drbd_request *req, enum drbd_req_event what,
+		struct drbd_peer_device *peer_device,
 		struct bio_and_error *m)
 {
 	struct drbd_device *const device = req->device;
-	struct drbd_peer_device *const peer_device = first_peer_device(device);
 	struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
 	struct net_conf *nc;
 	int p, rv = 0;
@@ -1100,6 +1103,7 @@ static bool drbd_should_send_out_of_sync(union drbd_dev_state s)
 static int drbd_process_write_request(struct drbd_request *req)
 {
 	struct drbd_device *device = req->device;
+	struct drbd_peer_device *peer_device = first_peer_device(device);
 	int remote, send_oos;
 
 	remote = drbd_should_do_remote(device->state);
@@ -1115,7 +1119,7 @@ static int drbd_process_write_request(struct drbd_request *req)
 		/* The only size==0 bios we expect are empty flushes. */
 		D_ASSERT(device, req->master_bio->bi_opf & REQ_PREFLUSH);
 		if (remote)
-			_req_mod(req, QUEUE_AS_DRBD_BARRIER);
+			_req_mod(req, QUEUE_AS_DRBD_BARRIER, peer_device);
 		return remote;
 	}
 
@@ -1125,10 +1129,10 @@ static int drbd_process_write_request(struct drbd_request *req)
 	D_ASSERT(device, !(remote && send_oos));
 
 	if (remote) {
-		_req_mod(req, TO_BE_SENT);
-		_req_mod(req, QUEUE_FOR_NET_WRITE);
+		_req_mod(req, TO_BE_SENT, peer_device);
+		_req_mod(req, QUEUE_FOR_NET_WRITE, peer_device);
 	} else if (drbd_set_out_of_sync(device, req->i.sector, req->i.size))
-		_req_mod(req, QUEUE_FOR_SEND_OOS);
+		_req_mod(req, QUEUE_FOR_SEND_OOS, peer_device);
 
 	return remote;
 }
@@ -1312,6 +1316,7 @@ static void drbd_update_plug(struct drbd_plug_cb *plug, struct drbd_request *req
 static void drbd_send_and_submit(struct drbd_device *device, struct drbd_request *req)
 {
 	struct drbd_resource *resource = device->resource;
+	struct drbd_peer_device *peer_device = first_peer_device(device);
 	const int rw = bio_data_dir(req->master_bio);
 	struct bio_and_error m = { NULL, };
 	bool no_remote = false;
@@ -1375,8 +1380,8 @@ static void drbd_send_and_submit(struct drbd_device *device, struct drbd_request
 		/* We either have a private_bio, or we can read from remote.
 		 * Otherwise we had done the goto nodata above. */
 		if (req->private_bio == NULL) {
-			_req_mod(req, TO_BE_SENT);
-			_req_mod(req, QUEUE_FOR_NET_READ);
+			_req_mod(req, TO_BE_SENT, peer_device);
+			_req_mod(req, QUEUE_FOR_NET_READ, peer_device);
 		} else
 			no_remote = true;
 	}
@@ -1397,7 +1402,7 @@ static void drbd_send_and_submit(struct drbd_device *device, struct drbd_request
 		req->pre_submit_jif = jiffies;
 		list_add_tail(&req->req_pending_local,
 			&device->pending_completion[rw == WRITE]);
-		_req_mod(req, TO_BE_SUBMITTED);
+		_req_mod(req, TO_BE_SUBMITTED, NULL);
 		/* but we need to give up the spinlock to submit */
 		submit_private_bio = true;
 	} else if (no_remote) {
diff --git a/drivers/block/drbd/drbd_req.h b/drivers/block/drbd/drbd_req.h
index b4017b5c3fbc..9ae860e7591b 100644
--- a/drivers/block/drbd/drbd_req.h
+++ b/drivers/block/drbd/drbd_req.h
@@ -267,6 +267,7 @@ struct bio_and_error {
 extern void start_new_tl_epoch(struct drbd_connection *connection);
 extern void drbd_req_destroy(struct kref *kref);
 extern int __req_mod(struct drbd_request *req, enum drbd_req_event what,
+		struct drbd_peer_device *peer_device,
 		struct bio_and_error *m);
 extern void complete_master_bio(struct drbd_device *device,
 		struct bio_and_error *m);
@@ -280,14 +281,15 @@ extern void drbd_restart_request(struct drbd_request *req);
 
 /* use this if you don't want to deal with calling complete_master_bio()
  * outside the spinlock, e.g. when walking some list on cleanup. */
-static inline int _req_mod(struct drbd_request *req, enum drbd_req_event what)
+static inline int _req_mod(struct drbd_request *req, enum drbd_req_event what,
+		struct drbd_peer_device *peer_device)
 {
 	struct drbd_device *device = req->device;
 	struct bio_and_error m;
 	int rv;
 
 	/* __req_mod possibly frees req, do not touch req after that! */
-	rv = __req_mod(req, what, &m);
+	rv = __req_mod(req, what, peer_device, &m);
 	if (m.bio)
 		complete_master_bio(device, &m);
 
@@ -299,7 +301,8 @@ static inline int _req_mod(struct drbd_request *req, enum drbd_req_event what)
  * of the lower level driver completion callback, so we need to
  * spin_lock_irqsave here. */
 static inline int req_mod(struct drbd_request *req,
-		enum drbd_req_event what)
+		enum drbd_req_event what,
+		struct drbd_peer_device *peer_device)
 {
 	unsigned long flags;
 	struct drbd_device *device = req->device;
@@ -307,7 +310,7 @@ static inline int req_mod(struct drbd_request *req,
 	int rv;
 
 	spin_lock_irqsave(&device->resource->req_lock, flags);
-	rv = __req_mod(req, what, &m);
+	rv = __req_mod(req, what, peer_device, &m);
 	spin_unlock_irqrestore(&device->resource->req_lock, flags);
 
 	if (m.bio)
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 68d5ba4af17d..6455edca7aa9 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -276,7 +276,7 @@ void drbd_request_endio(struct bio *bio)
 
 	/* not req_mod(), we need irqsave here! */
 	spin_lock_irqsave(&device->resource->req_lock, flags);
-	__req_mod(req, what, &m);
+	__req_mod(req, what, NULL, &m);
 	spin_unlock_irqrestore(&device->resource->req_lock, flags);
 	put_ldev(device);
 
@@ -1425,7 +1425,7 @@ int w_send_out_of_sync(struct drbd_work *w, int cancel)
 	int err;
 
 	if (unlikely(cancel)) {
-		req_mod(req, SEND_CANCELED);
+		req_mod(req, SEND_CANCELED, peer_device);
 		return 0;
 	}
 	req->pre_send_jif = jiffies;
@@ -1437,7 +1437,7 @@ int w_send_out_of_sync(struct drbd_work *w, int cancel)
 	maybe_send_barrier(connection, req->epoch);
 
 	err = drbd_send_out_of_sync(peer_device, req);
-	req_mod(req, OOS_HANDED_TO_NETWORK);
+	req_mod(req, OOS_HANDED_TO_NETWORK, peer_device);
 
 	return err;
 }
@@ -1457,7 +1457,7 @@ int w_send_dblock(struct drbd_work *w, int cancel)
 	int err;
 
 	if (unlikely(cancel)) {
-		req_mod(req, SEND_CANCELED);
+		req_mod(req, SEND_CANCELED, peer_device);
 		return 0;
 	}
 	req->pre_send_jif = jiffies;
@@ -1467,7 +1467,7 @@ int w_send_dblock(struct drbd_work *w, int cancel)
 	connection->send.current_epoch_writes++;
 
 	err = drbd_send_dblock(peer_device, req);
-	req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK);
+	req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK, peer_device);
 
 	if (do_send_unplug && !err)
 		pd_send_unplug_remote(peer_device);
@@ -1490,7 +1490,7 @@ int w_send_read_req(struct drbd_work *w, int cancel)
 	int err;
 
 	if (unlikely(cancel)) {
-		req_mod(req, SEND_CANCELED);
+		req_mod(req, SEND_CANCELED, peer_device);
 		return 0;
 	}
 	req->pre_send_jif = jiffies;
@@ -1502,7 +1502,7 @@ int w_send_read_req(struct drbd_work *w, int cancel)
 	err = drbd_send_drequest(peer_device, P_DATA_REQUEST, req->i.sector, req->i.size,
 				 (unsigned long)req);
 
-	req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK);
+	req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK, peer_device);
 
 	if (do_send_unplug && !err)
 		pd_send_unplug_remote(peer_device);
-- 
2.39.2