Commit cb703454 authored by Philipp Reisner's avatar Philipp Reisner
Browse files

drbd: Converted drbd_try_outdate_peer() from mdev to tconn 



Signed-off-by: default avatarPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: default avatarLars Ellenberg <lars.ellenberg@linbit.com>
parent a02d1240

drivers/block/drbd/drbd_int.h

+2 −2
Original line number Diff line number Diff line
@@ -1472,8 +1472,8 @@ extern void drbd_reconsider_max_bio_size(struct drbd_conf *mdev); 
extern enum drbd_state_rv drbd_set_role(struct drbd_conf *mdev,

					enum drbd_role new_role,

					int force);

extern enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev);

extern void drbd_try_outdate_peer_async(struct drbd_conf *mdev);

extern bool conn_try_outdate_peer(struct drbd_tconn *tconn);

extern void conn_try_outdate_peer_async(struct drbd_tconn *tconn);

extern int drbd_khelper(struct drbd_conf *mdev, char *cmd);



/* drbd_worker.c */

drivers/block/drbd/drbd_nl.c

+70 −74
Original line number Diff line number Diff line
@@ -366,116 +366,122 @@ int conn_khelper(struct drbd_tconn *tconn, char *cmd) 
	return ret;

}



enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)

static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)

{

	enum drbd_fencing_p fp = FP_NOT_AVAIL;

	struct drbd_conf *mdev;

	int vnr;



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

		if (get_ldev_if_state(mdev, D_CONSISTENT)) {

			fp = max_t(enum drbd_fencing_p, fp, mdev->ldev->dc.fencing);

			put_ldev(mdev);

		}

	}



	return fp;

}



bool conn_try_outdate_peer(struct drbd_tconn *tconn)

{

	union drbd_state mask = { };

	union drbd_state val = { };

	enum drbd_fencing_p fp;

	char *ex_to_string;

	int r;

	enum drbd_disk_state nps;

	enum drbd_fencing_p fp;



	D_ASSERT(mdev->state.pdsk == D_UNKNOWN);

	if (tconn->cstate >= C_WF_REPORT_PARAMS) {

		conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");

		return false;

	}



	if (get_ldev_if_state(mdev, D_CONSISTENT)) {

		fp = mdev->ldev->dc.fencing;

		put_ldev(mdev);

	} else {

		dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");

		nps = mdev->state.pdsk;

	fp = highest_fencing_policy(tconn);

	switch (fp) {

	case FP_NOT_AVAIL:

		conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");

		goto out;

	case FP_DONT_CARE:

		return true;

	default: ;

	}



	r = drbd_khelper(mdev, "fence-peer");

	r = conn_khelper(tconn, "fence-peer");



	switch ((r>>8) & 0xff) {

	case 3: /* peer is inconsistent */

		ex_to_string = "peer is inconsistent or worse";

		nps = D_INCONSISTENT;

		mask.pdsk = D_MASK;

		val.pdsk = D_INCONSISTENT;

		break;

	case 4: /* peer got outdated, or was already outdated */

		ex_to_string = "peer was fenced";

		nps = D_OUTDATED;

		mask.pdsk = D_MASK;

		val.pdsk = D_OUTDATED;

		break;

	case 5: /* peer was down */

		if (mdev->state.disk == D_UP_TO_DATE) {

		if (conn_highest_disk(tconn) == D_UP_TO_DATE) {

			/* we will(have) create(d) a new UUID anyways... */

			ex_to_string = "peer is unreachable, assumed to be dead";

			nps = D_OUTDATED;

			mask.pdsk = D_MASK;

			val.pdsk = D_OUTDATED;

		} else {

			ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";

			nps = mdev->state.pdsk;

		}

		break;

	case 6: /* Peer is primary, voluntarily outdate myself.

		 * This is useful when an unconnected R_SECONDARY is asked to

		 * become R_PRIMARY, but finds the other peer being active. */

		ex_to_string = "peer is active";

		dev_warn(DEV, "Peer is primary, outdating myself.\n");

		nps = D_UNKNOWN;

		_drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);

		conn_warn(tconn, "Peer is primary, outdating myself.\n");

		mask.disk = D_MASK;

		val.disk = D_OUTDATED;

		break;

	case 7:

		if (fp != FP_STONITH)

			dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");

			conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");

		ex_to_string = "peer was stonithed";

		nps = D_OUTDATED;

		mask.pdsk = D_MASK;

		val.pdsk = D_OUTDATED;

		break;

	default:

		/* The script is broken ... */

		nps = D_UNKNOWN;

		dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);

		return nps;

		conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);

		return false; /* Eventually leave IO frozen */

	}



	dev_info(DEV, "fence-peer helper returned %d (%s)\n",

	conn_info(tconn, "fence-peer helper returned %d (%s)\n",

		  (r>>8) & 0xff, ex_to_string);



 out:

	if (mdev->state.susp_fen && nps >= D_UNKNOWN) {

		/* The handler was not successful... unfreeze here, the

		   state engine can not unfreeze... */

		_drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE);

	}



	return nps;

	/* Not using

	   conn_request_state(tconn, mask, val, CS_VERBOSE);

	   here, because we might were able to re-establish the connection in the

	   meantime. */

	spin_lock_irq(&tconn->req_lock);

	if (tconn->cstate < C_WF_REPORT_PARAMS)

		_conn_request_state(tconn, mask, val, CS_VERBOSE);

	spin_unlock_irq(&tconn->req_lock);



	return conn_highest_pdsk(tconn) <= D_OUTDATED;

}



static int _try_outdate_peer_async(void *data)

{

	struct drbd_conf *mdev = (struct drbd_conf *)data;

	enum drbd_disk_state nps;

	union drbd_state ns;

	struct drbd_tconn *tconn = (struct drbd_tconn *)data;



	nps = drbd_try_outdate_peer(mdev);



	/* Not using

	   drbd_request_state(mdev, NS(pdsk, nps));

	   here, because we might were able to re-establish the connection

	   in the meantime. This can only partially be solved in the state's

	   engine is_valid_state() and is_valid_state_transition()

	   functions.



	   nps can be D_INCONSISTENT, D_OUTDATED or D_UNKNOWN.

	   pdsk == D_INCONSISTENT while conn >= C_CONNECTED is valid,

	   therefore we have to have the pre state change check here.

	*/

	spin_lock_irq(&mdev->tconn->req_lock);

	ns = mdev->state;

	if (ns.conn < C_WF_REPORT_PARAMS) {

		ns.pdsk = nps;

		_drbd_set_state(mdev, ns, CS_VERBOSE, NULL);

	}

	spin_unlock_irq(&mdev->tconn->req_lock);

	conn_try_outdate_peer(tconn);



	return 0;

}



void drbd_try_outdate_peer_async(struct drbd_conf *mdev)

void conn_try_outdate_peer_async(struct drbd_tconn *tconn)

{

	struct task_struct *opa;



	opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));

	opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");

	if (IS_ERR(opa))

		dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");

		conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");

}



enum drbd_state_rv
@@ -486,7 +492,6 @@ drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) 
	int try = 0;

	int forced = 0;

	union drbd_state mask, val;

	enum drbd_disk_state nps;



	if (new_role == R_PRIMARY)

		request_ping(mdev->tconn); /* Detect a dead peer ASAP */
@@ -519,32 +524,23 @@ drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) 
		if (rv == SS_NO_UP_TO_DATE_DISK &&

		    mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {

			D_ASSERT(mdev->state.pdsk == D_UNKNOWN);

			nps = drbd_try_outdate_peer(mdev);



			if (nps == D_OUTDATED || nps == D_INCONSISTENT) {

			if (conn_try_outdate_peer(mdev->tconn)) {

				val.disk = D_UP_TO_DATE;

				mask.disk = D_MASK;

			}



			val.pdsk = nps;

			mask.pdsk = D_MASK;



			continue;

		}



		if (rv == SS_NOTHING_TO_DO)

			goto out;

		if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {

			nps = drbd_try_outdate_peer(mdev);



			if (force && nps > D_OUTDATED) {

			if (!conn_try_outdate_peer(mdev->tconn) && force) {

				dev_warn(DEV, "Forced into split brain situation!\n");

				nps = D_OUTDATED;

			}



				mask.pdsk = D_MASK;

			val.pdsk  = nps;

				val.pdsk  = D_OUTDATED;



			}

			continue;

		}

		if (rv == SS_TWO_PRIMARIES) {

drivers/block/drbd/drbd_receiver.c

+3 −4
Original line number Diff line number Diff line
@@ -4030,9 +4030,11 @@ static void drbd_disconnect(struct drbd_tconn *tconn) 
	drbd_free_sock(tconn);



	idr_for_each(&tconn->volumes, drbd_disconnected, tconn);



	conn_info(tconn, "Connection closed\n");



	if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN)

		conn_try_outdate_peer_async(tconn);



	spin_lock_irq(&tconn->req_lock);

	oc = tconn->cstate;

	if (oc >= C_UNCONNECTED)
@@ -4109,9 +4111,6 @@ static int drbd_disconnected(int vnr, void *p, void *data) 
		put_ldev(mdev);

	}



	if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN)

		drbd_try_outdate_peer_async(mdev);



	/* serialize with bitmap writeout triggered by the state change,

	 * if any. */

	wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));

drivers/block/drbd/drbd_state.c

+70 −15
Original line number Diff line number Diff line
@@ -61,6 +61,73 @@ bool conn_all_vols_unconf(struct drbd_tconn *tconn) 
	return true;

}



/* Unfortunately the states where not correctly ordered, when

   they where defined. therefore can not use max_t() here. */

static enum drbd_role max_role(enum drbd_role role1, enum drbd_role role2)

{

	if (role1 == R_PRIMARY || role2 == R_PRIMARY)

		return R_PRIMARY;

	if (role1 == R_SECONDARY || role2 == R_SECONDARY)

		return R_SECONDARY;

	return R_UNKNOWN;

}

static enum drbd_role min_role(enum drbd_role role1, enum drbd_role role2)

{

	if (role1 == R_UNKNOWN || role2 == R_UNKNOWN)

		return R_UNKNOWN;

	if (role1 == R_SECONDARY || role2 == R_SECONDARY)

		return R_SECONDARY;

	return R_PRIMARY;

}



enum drbd_role conn_highest_role(struct drbd_tconn *tconn)

{

	enum drbd_role role = R_UNKNOWN;

	struct drbd_conf *mdev;

	int vnr;



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

		role = max_role(role, mdev->state.role);



	return role;

}



enum drbd_role conn_highest_peer(struct drbd_tconn *tconn)

{

	enum drbd_role peer = R_UNKNOWN;

	struct drbd_conf *mdev;

	int vnr;



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

		peer = max_role(peer, mdev->state.peer);



	return peer;

}



enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn)

{

	enum drbd_disk_state ds = D_DISKLESS;

	struct drbd_conf *mdev;

	int vnr;



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

		ds = max_t(enum drbd_disk_state, ds, mdev->state.disk);



	return ds;

}



enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn)

{

	enum drbd_disk_state ds = D_DISKLESS;

	struct drbd_conf *mdev;

	int vnr;



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

		ds = max_t(enum drbd_disk_state, ds, mdev->state.pdsk);



	return ds;

}



/**

 * cl_wide_st_chg() - true if the state change is a cluster wide one

 * @mdev:	DRBD device.
@@ -329,18 +396,6 @@ static void print_state_change(struct drbd_conf *mdev, union drbd_state os, unio 
		dev_info(DEV, "%s\n", pb);

}



static bool vol_has_primary_peer(struct drbd_tconn *tconn)

{

	struct drbd_conf *mdev;

	int vnr;



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

		if (mdev->state.peer == R_PRIMARY)

			return true;

	}

	return false;

}



/**

 * is_valid_state() - Returns an SS_ error code if ns is not valid

 * @mdev:	DRBD device.
@@ -364,7 +419,7 @@ is_valid_state(struct drbd_conf *mdev, union drbd_state ns) 
		if (!mdev->tconn->net_conf->two_primaries && ns.role == R_PRIMARY) {

			if (ns.peer == R_PRIMARY)

				rv = SS_TWO_PRIMARIES;

			else if (vol_has_primary_peer(mdev->tconn))

			else if (conn_highest_peer(mdev->tconn) == R_PRIMARY)

				rv = SS_O_VOL_PEER_PRI;

			}

		put_net_conf(mdev->tconn);
@@ -1390,8 +1445,8 @@ static int _set_state_itr_fn(int vnr, void *p, void *data) 


	rv = __drbd_set_state(mdev, ns, flags, NULL);



	ms.role = max_t(enum drbd_role, mdev->state.role, ms.role);

	ms.peer = max_t(enum drbd_role, mdev->state.peer, ms.peer);

	ms.role = max_role(ns.role, ms.role);

	ms.peer = max_role(ns.peer, ms.peer);

	ms.disk = max_t(enum drbd_role, mdev->state.disk, ms.disk);

	ms.pdsk = max_t(enum drbd_role, mdev->state.pdsk, ms.pdsk);

	params->ms = ms;

drivers/block/drbd/drbd_state.h

+5 −0
Original line number Diff line number Diff line
@@ -110,4 +110,9 @@ static inline int drbd_request_state(struct drbd_conf *mdev, 
	return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED);

}



enum drbd_role conn_highest_role(struct drbd_tconn *tconn);

enum drbd_role conn_highest_peer(struct drbd_tconn *tconn);

enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn);

enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn);



#endif

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