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Commit 19fffd7b authored by Philipp Reisner's avatar Philipp Reisner
Browse files

drbd: Call drbd_md_sync() explicitly after a state change on the connection 



Without this, the meta-data gets updates after 5 seconds by the
md_sync_timer. Better to do it immeditaly after a state change.

If the asender detects a network failure, it may take a bit until
the worker processes the according after-conn-state-change work item.

  The worker might be blocked in sending something, i.e. it
  takes until it gets into its timeout. That is 6 seconds by
  default which is longer than the 5 seconds of the md_sync_timer.

Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
parent d7644018

drivers/block/drbd/drbd_int.h

+1 −0
Original line number Diff line number Diff line
@@ -1116,6 +1116,7 @@ extern void drbd_free_bc(struct drbd_backing_dev *ldev); 
extern void drbd_mdev_cleanup(struct drbd_conf *mdev);

void drbd_print_uuids(struct drbd_conf *mdev, const char *text);



extern void conn_md_sync(struct drbd_tconn *tconn);

extern void drbd_md_sync(struct drbd_conf *mdev);

extern int  drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev);

extern void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local);

drivers/block/drbd/drbd_main.c

+16 −0
Original line number Diff line number Diff line
@@ -2820,6 +2820,22 @@ void drbd_free_sock(struct drbd_tconn *tconn) 


/* meta data management */



void conn_md_sync(struct drbd_tconn *tconn)

{

	struct drbd_conf *mdev;

	int vnr;



	rcu_read_lock();

	idr_for_each_entry(&tconn->volumes, mdev, vnr) {

		kref_get(&mdev->kref);

		rcu_read_unlock();

		drbd_md_sync(mdev);

		kref_put(&mdev->kref, &drbd_minor_destroy);

		rcu_read_lock();

	}

	rcu_read_unlock();

}



struct meta_data_on_disk {

	u64 la_size;           /* last agreed size. */

	u64 uuid[UI_SIZE];   /* UUIDs. */

drivers/block/drbd/drbd_nl.c

+0 −16
Original line number Diff line number Diff line
@@ -363,22 +363,6 @@ int drbd_khelper(struct drbd_conf *mdev, char *cmd) 
	return ret;

}



static void conn_md_sync(struct drbd_tconn *tconn)

{

	struct drbd_conf *mdev;

	int vnr;



	rcu_read_lock();

	idr_for_each_entry(&tconn->volumes, mdev, vnr) {

		kref_get(&mdev->kref);

		rcu_read_unlock();

		drbd_md_sync(mdev);

		kref_put(&mdev->kref, &drbd_minor_destroy);

		rcu_read_lock();

	}

	rcu_read_unlock();

}



int conn_khelper(struct drbd_tconn *tconn, char *cmd)

{

	char *envp[] = { "HOME=/",

drivers/block/drbd/drbd_receiver.c

+1 −0
Original line number Diff line number Diff line
@@ -5390,6 +5390,7 @@ int drbd_asender(struct drbd_thread *thi) 
	if (0) {

reconnect:

		conn_request_state(tconn, NS(conn, C_NETWORK_FAILURE), CS_HARD);

		conn_md_sync(tconn);

	}

	if (0) {

disconnect:

drivers/block/drbd/drbd_state.c

+3 −0
Original line number Diff line number Diff line
@@ -1563,6 +1563,9 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused) 
		}

	}

	kref_put(&tconn->kref, &conn_destroy);



	conn_md_sync(tconn);



	return 0;

}