aboutsummaryrefslogtreecommitdiff
path: root/drivers/block/drbd/drbd_state.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/block/drbd/drbd_state.c')
-rw-r--r--drivers/block/drbd/drbd_state.c1857
1 files changed, 1857 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
new file mode 100644
index 00000000000..69ef35266ba
--- /dev/null
+++ b/drivers/block/drbd/drbd_state.c
@@ -0,0 +1,1857 @@
+/*
+ drbd_state.c
+
+ This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
+
+ Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
+ Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
+ Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
+
+ Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
+ from Logicworks, Inc. for making SDP replication support possible.
+
+ drbd is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ drbd is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with drbd; see the file COPYING. If not, write to
+ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/drbd_limits.h>
+#include "drbd_int.h"
+#include "drbd_req.h"
+
+/* in drbd_main.c */
+extern void tl_abort_disk_io(struct drbd_conf *mdev);
+
+struct after_state_chg_work {
+ struct drbd_work w;
+ union drbd_state os;
+ union drbd_state ns;
+ enum chg_state_flags flags;
+ struct completion *done;
+};
+
+enum sanitize_state_warnings {
+ NO_WARNING,
+ ABORTED_ONLINE_VERIFY,
+ ABORTED_RESYNC,
+ CONNECTION_LOST_NEGOTIATING,
+ IMPLICITLY_UPGRADED_DISK,
+ IMPLICITLY_UPGRADED_PDSK,
+};
+
+static int w_after_state_ch(struct drbd_work *w, int unused);
+static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
+ union drbd_state ns, enum chg_state_flags flags);
+static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
+static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state, struct drbd_tconn *);
+static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns);
+static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
+ enum sanitize_state_warnings *warn);
+
+static inline bool is_susp(union drbd_state s)
+{
+ return s.susp || s.susp_nod || s.susp_fen;
+}
+
+bool conn_all_vols_unconf(struct drbd_tconn *tconn)
+{
+ struct drbd_conf *mdev;
+ bool rv = true;
+ int vnr;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr) {
+ if (mdev->state.disk != D_DISKLESS ||
+ mdev->state.conn != C_STANDALONE ||
+ mdev->state.role != R_SECONDARY) {
+ rv = false;
+ break;
+ }
+ }
+ rcu_read_unlock();
+
+ return rv;
+}
+
+/* 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;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr)
+ role = max_role(role, mdev->state.role);
+ rcu_read_unlock();
+
+ return role;
+}
+
+enum drbd_role conn_highest_peer(struct drbd_tconn *tconn)
+{
+ enum drbd_role peer = R_UNKNOWN;
+ struct drbd_conf *mdev;
+ int vnr;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr)
+ peer = max_role(peer, mdev->state.peer);
+ rcu_read_unlock();
+
+ 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;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr)
+ ds = max_t(enum drbd_disk_state, ds, mdev->state.disk);
+ rcu_read_unlock();
+
+ return ds;
+}
+
+enum drbd_disk_state conn_lowest_disk(struct drbd_tconn *tconn)
+{
+ enum drbd_disk_state ds = D_MASK;
+ struct drbd_conf *mdev;
+ int vnr;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr)
+ ds = min_t(enum drbd_disk_state, ds, mdev->state.disk);
+ rcu_read_unlock();
+
+ 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;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr)
+ ds = max_t(enum drbd_disk_state, ds, mdev->state.pdsk);
+ rcu_read_unlock();
+
+ return ds;
+}
+
+enum drbd_conns conn_lowest_conn(struct drbd_tconn *tconn)
+{
+ enum drbd_conns conn = C_MASK;
+ struct drbd_conf *mdev;
+ int vnr;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr)
+ conn = min_t(enum drbd_conns, conn, mdev->state.conn);
+ rcu_read_unlock();
+
+ return conn;
+}
+
+static bool no_peer_wf_report_params(struct drbd_tconn *tconn)
+{
+ struct drbd_conf *mdev;
+ int vnr;
+ bool rv = true;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr)
+ if (mdev->state.conn == C_WF_REPORT_PARAMS) {
+ rv = false;
+ break;
+ }
+ rcu_read_unlock();
+
+ return rv;
+}
+
+
+/**
+ * cl_wide_st_chg() - true if the state change is a cluster wide one
+ * @mdev: DRBD device.
+ * @os: old (current) state.
+ * @ns: new (wanted) state.
+ */
+static int cl_wide_st_chg(struct drbd_conf *mdev,
+ union drbd_state os, union drbd_state ns)
+{
+ return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
+ ((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
+ (os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
+ (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
+ (os.disk != D_FAILED && ns.disk == D_FAILED))) ||
+ (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
+ (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S) ||
+ (os.conn == C_CONNECTED && ns.conn == C_WF_REPORT_PARAMS);
+}
+
+static union drbd_state
+apply_mask_val(union drbd_state os, union drbd_state mask, union drbd_state val)
+{
+ union drbd_state ns;
+ ns.i = (os.i & ~mask.i) | val.i;
+ return ns;
+}
+
+enum drbd_state_rv
+drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
+ union drbd_state mask, union drbd_state val)
+{
+ unsigned long flags;
+ union drbd_state ns;
+ enum drbd_state_rv rv;
+
+ spin_lock_irqsave(&mdev->tconn->req_lock, flags);
+ ns = apply_mask_val(drbd_read_state(mdev), mask, val);
+ rv = _drbd_set_state(mdev, ns, f, NULL);
+ spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
+
+ return rv;
+}
+
+/**
+ * drbd_force_state() - Impose a change which happens outside our control on our state
+ * @mdev: DRBD device.
+ * @mask: mask of state bits to change.
+ * @val: value of new state bits.
+ */
+void drbd_force_state(struct drbd_conf *mdev,
+ union drbd_state mask, union drbd_state val)
+{
+ drbd_change_state(mdev, CS_HARD, mask, val);
+}
+
+static enum drbd_state_rv
+_req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
+ union drbd_state val)
+{
+ union drbd_state os, ns;
+ unsigned long flags;
+ enum drbd_state_rv rv;
+
+ if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
+ return SS_CW_SUCCESS;
+
+ if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
+ return SS_CW_FAILED_BY_PEER;
+
+ spin_lock_irqsave(&mdev->tconn->req_lock, flags);
+ os = drbd_read_state(mdev);
+ ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
+ rv = is_valid_transition(os, ns);
+ if (rv >= SS_SUCCESS)
+ rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
+
+ if (!cl_wide_st_chg(mdev, os, ns))
+ rv = SS_CW_NO_NEED;
+ if (rv == SS_UNKNOWN_ERROR) {
+ rv = is_valid_state(mdev, ns);
+ if (rv >= SS_SUCCESS) {
+ rv = is_valid_soft_transition(os, ns, mdev->tconn);
+ if (rv >= SS_SUCCESS)
+ rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
+ }
+ }
+ spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
+
+ return rv;
+}
+
+/**
+ * drbd_req_state() - Perform an eventually cluster wide state change
+ * @mdev: DRBD device.
+ * @mask: mask of state bits to change.
+ * @val: value of new state bits.
+ * @f: flags
+ *
+ * Should not be called directly, use drbd_request_state() or
+ * _drbd_request_state().
+ */
+static enum drbd_state_rv
+drbd_req_state(struct drbd_conf *mdev, union drbd_state mask,
+ union drbd_state val, enum chg_state_flags f)
+{
+ struct completion done;
+ unsigned long flags;
+ union drbd_state os, ns;
+ enum drbd_state_rv rv;
+
+ init_completion(&done);
+
+ if (f & CS_SERIALIZE)
+ mutex_lock(mdev->state_mutex);
+
+ spin_lock_irqsave(&mdev->tconn->req_lock, flags);
+ os = drbd_read_state(mdev);
+ ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
+ rv = is_valid_transition(os, ns);
+ if (rv < SS_SUCCESS) {
+ spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
+ goto abort;
+ }
+
+ if (cl_wide_st_chg(mdev, os, ns)) {
+ rv = is_valid_state(mdev, ns);
+ if (rv == SS_SUCCESS)
+ rv = is_valid_soft_transition(os, ns, mdev->tconn);
+ spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
+
+ if (rv < SS_SUCCESS) {
+ if (f & CS_VERBOSE)
+ print_st_err(mdev, os, ns, rv);
+ goto abort;
+ }
+
+ if (drbd_send_state_req(mdev, mask, val)) {
+ rv = SS_CW_FAILED_BY_PEER;
+ if (f & CS_VERBOSE)
+ print_st_err(mdev, os, ns, rv);
+ goto abort;
+ }
+
+ wait_event(mdev->state_wait,
+ (rv = _req_st_cond(mdev, mask, val)));
+
+ if (rv < SS_SUCCESS) {
+ if (f & CS_VERBOSE)
+ print_st_err(mdev, os, ns, rv);
+ goto abort;
+ }
+ spin_lock_irqsave(&mdev->tconn->req_lock, flags);
+ ns = apply_mask_val(drbd_read_state(mdev), mask, val);
+ rv = _drbd_set_state(mdev, ns, f, &done);
+ } else {
+ rv = _drbd_set_state(mdev, ns, f, &done);
+ }
+
+ spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
+
+ if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
+ D_ASSERT(current != mdev->tconn->worker.task);
+ wait_for_completion(&done);
+ }
+
+abort:
+ if (f & CS_SERIALIZE)
+ mutex_unlock(mdev->state_mutex);
+
+ return rv;
+}
+
+/**
+ * _drbd_request_state() - Request a state change (with flags)
+ * @mdev: DRBD device.
+ * @mask: mask of state bits to change.
+ * @val: value of new state bits.
+ * @f: flags
+ *
+ * Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
+ * flag, or when logging of failed state change requests is not desired.
+ */
+enum drbd_state_rv
+_drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
+ union drbd_state val, enum chg_state_flags f)
+{
+ enum drbd_state_rv rv;
+
+ wait_event(mdev->state_wait,
+ (rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
+
+ return rv;
+}
+
+static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
+{
+ dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n",
+ name,
+ drbd_conn_str(ns.conn),
+ drbd_role_str(ns.role),
+ drbd_role_str(ns.peer),
+ drbd_disk_str(ns.disk),
+ drbd_disk_str(ns.pdsk),
+ is_susp(ns) ? 's' : 'r',
+ ns.aftr_isp ? 'a' : '-',
+ ns.peer_isp ? 'p' : '-',
+ ns.user_isp ? 'u' : '-',
+ ns.susp_fen ? 'F' : '-',
+ ns.susp_nod ? 'N' : '-'
+ );
+}
+
+void print_st_err(struct drbd_conf *mdev, union drbd_state os,
+ union drbd_state ns, enum drbd_state_rv err)
+{
+ if (err == SS_IN_TRANSIENT_STATE)
+ return;
+ dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
+ print_st(mdev, " state", os);
+ print_st(mdev, "wanted", ns);
+}
+
+static long print_state_change(char *pb, union drbd_state os, union drbd_state ns,
+ enum chg_state_flags flags)
+{
+ char *pbp;
+ pbp = pb;
+ *pbp = 0;
+
+ if (ns.role != os.role && flags & CS_DC_ROLE)
+ pbp += sprintf(pbp, "role( %s -> %s ) ",
+ drbd_role_str(os.role),
+ drbd_role_str(ns.role));
+ if (ns.peer != os.peer && flags & CS_DC_PEER)
+ pbp += sprintf(pbp, "peer( %s -> %s ) ",
+ drbd_role_str(os.peer),
+ drbd_role_str(ns.peer));
+ if (ns.conn != os.conn && flags & CS_DC_CONN)
+ pbp += sprintf(pbp, "conn( %s -> %s ) ",
+ drbd_conn_str(os.conn),
+ drbd_conn_str(ns.conn));
+ if (ns.disk != os.disk && flags & CS_DC_DISK)
+ pbp += sprintf(pbp, "disk( %s -> %s ) ",
+ drbd_disk_str(os.disk),
+ drbd_disk_str(ns.disk));
+ if (ns.pdsk != os.pdsk && flags & CS_DC_PDSK)
+ pbp += sprintf(pbp, "pdsk( %s -> %s ) ",
+ drbd_disk_str(os.pdsk),
+ drbd_disk_str(ns.pdsk));
+
+ return pbp - pb;
+}
+
+static void drbd_pr_state_change(struct drbd_conf *mdev, union drbd_state os, union drbd_state ns,
+ enum chg_state_flags flags)
+{
+ char pb[300];
+ char *pbp = pb;
+
+ pbp += print_state_change(pbp, os, ns, flags ^ CS_DC_MASK);
+
+ if (ns.aftr_isp != os.aftr_isp)
+ pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ",
+ os.aftr_isp,
+ ns.aftr_isp);
+ if (ns.peer_isp != os.peer_isp)
+ pbp += sprintf(pbp, "peer_isp( %d -> %d ) ",
+ os.peer_isp,
+ ns.peer_isp);
+ if (ns.user_isp != os.user_isp)
+ pbp += sprintf(pbp, "user_isp( %d -> %d ) ",
+ os.user_isp,
+ ns.user_isp);
+
+ if (pbp != pb)
+ dev_info(DEV, "%s\n", pb);
+}
+
+static void conn_pr_state_change(struct drbd_tconn *tconn, union drbd_state os, union drbd_state ns,
+ enum chg_state_flags flags)
+{
+ char pb[300];
+ char *pbp = pb;
+
+ pbp += print_state_change(pbp, os, ns, flags);
+
+ if (is_susp(ns) != is_susp(os) && flags & CS_DC_SUSP)
+ pbp += sprintf(pbp, "susp( %d -> %d ) ",
+ is_susp(os),
+ is_susp(ns));
+
+ if (pbp != pb)
+ conn_info(tconn, "%s\n", pb);
+}
+
+
+/**
+ * is_valid_state() - Returns an SS_ error code if ns is not valid
+ * @mdev: DRBD device.
+ * @ns: State to consider.
+ */
+static enum drbd_state_rv
+is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
+{
+ /* See drbd_state_sw_errors in drbd_strings.c */
+
+ enum drbd_fencing_p fp;
+ enum drbd_state_rv rv = SS_SUCCESS;
+ struct net_conf *nc;
+
+ rcu_read_lock();
+ fp = FP_DONT_CARE;
+ if (get_ldev(mdev)) {
+ fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
+ put_ldev(mdev);
+ }
+
+ nc = rcu_dereference(mdev->tconn->net_conf);
+ if (nc) {
+ if (!nc->two_primaries && ns.role == R_PRIMARY) {
+ if (ns.peer == R_PRIMARY)
+ rv = SS_TWO_PRIMARIES;
+ else if (conn_highest_peer(mdev->tconn) == R_PRIMARY)
+ rv = SS_O_VOL_PEER_PRI;
+ }
+ }
+
+ if (rv <= 0)
+ /* already found a reason to abort */;
+ else if (ns.role == R_SECONDARY && mdev->open_cnt)
+ rv = SS_DEVICE_IN_USE;
+
+ else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
+ rv = SS_NO_UP_TO_DATE_DISK;
+
+ else if (fp >= FP_RESOURCE &&
+ ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
+ rv = SS_PRIMARY_NOP;
+
+ else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
+ rv = SS_NO_UP_TO_DATE_DISK;
+
+ else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
+ rv = SS_NO_LOCAL_DISK;
+
+ else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
+ rv = SS_NO_REMOTE_DISK;
+
+ else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
+ rv = SS_NO_UP_TO_DATE_DISK;
+
+ else if ((ns.conn == C_CONNECTED ||
+ ns.conn == C_WF_BITMAP_S ||
+ ns.conn == C_SYNC_SOURCE ||
+ ns.conn == C_PAUSED_SYNC_S) &&
+ ns.disk == D_OUTDATED)
+ rv = SS_CONNECTED_OUTDATES;
+
+ else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
+ (nc->verify_alg[0] == 0))
+ rv = SS_NO_VERIFY_ALG;
+
+ else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
+ mdev->tconn->agreed_pro_version < 88)
+ rv = SS_NOT_SUPPORTED;
+
+ else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN)
+ rv = SS_CONNECTED_OUTDATES;
+
+ rcu_read_unlock();
+
+ return rv;
+}
+
+/**
+ * is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible
+ * This function limits state transitions that may be declined by DRBD. I.e.
+ * user requests (aka soft transitions).
+ * @mdev: DRBD device.
+ * @ns: new state.
+ * @os: old state.
+ */
+static enum drbd_state_rv
+is_valid_soft_transition(union drbd_state os, union drbd_state ns, struct drbd_tconn *tconn)
+{
+ enum drbd_state_rv rv = SS_SUCCESS;
+
+ if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
+ os.conn > C_CONNECTED)
+ rv = SS_RESYNC_RUNNING;
+
+ if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
+ rv = SS_ALREADY_STANDALONE;
+
+ if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
+ rv = SS_IS_DISKLESS;
+
+ if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
+ rv = SS_NO_NET_CONFIG;
+
+ if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
+ rv = SS_LOWER_THAN_OUTDATED;
+
+ if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
+ rv = SS_IN_TRANSIENT_STATE;
+
+ /* if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
+ rv = SS_IN_TRANSIENT_STATE; */
+
+ /* While establishing a connection only allow cstate to change.
+ Delay/refuse role changes, detach attach etc... */
+ if (test_bit(STATE_SENT, &tconn->flags) &&
+ !(os.conn == C_WF_REPORT_PARAMS ||
+ (ns.conn == C_WF_REPORT_PARAMS && os.conn == C_WF_CONNECTION)))
+ rv = SS_IN_TRANSIENT_STATE;
+
+ if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
+ rv = SS_NEED_CONNECTION;
+
+ if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
+ ns.conn != os.conn && os.conn > C_CONNECTED)
+ rv = SS_RESYNC_RUNNING;
+
+ if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
+ os.conn < C_CONNECTED)
+ rv = SS_NEED_CONNECTION;
+
+ if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)
+ && os.conn < C_WF_REPORT_PARAMS)
+ rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */
+
+ return rv;
+}
+
+static enum drbd_state_rv
+is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc)
+{
+ /* no change -> nothing to do, at least for the connection part */
+ if (oc == nc)
+ return SS_NOTHING_TO_DO;
+
+ /* disconnect of an unconfigured connection does not make sense */
+ if (oc == C_STANDALONE && nc == C_DISCONNECTING)
+ return SS_ALREADY_STANDALONE;
+
+ /* from C_STANDALONE, we start with C_UNCONNECTED */
+ if (oc == C_STANDALONE && nc != C_UNCONNECTED)
+ return SS_NEED_CONNECTION;
+
+ /* When establishing a connection we need to go through WF_REPORT_PARAMS!
+ Necessary to do the right thing upon invalidate-remote on a disconnected resource */
+ if (oc < C_WF_REPORT_PARAMS && nc >= C_CONNECTED)
+ return SS_NEED_CONNECTION;
+
+ /* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */
+ if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING)
+ return SS_IN_TRANSIENT_STATE;
+
+ /* After C_DISCONNECTING only C_STANDALONE may follow */
+ if (oc == C_DISCONNECTING && nc != C_STANDALONE)
+ return SS_IN_TRANSIENT_STATE;
+
+ return SS_SUCCESS;
+}
+
+
+/**
+ * is_valid_transition() - Returns an SS_ error code if the state transition is not possible
+ * This limits hard state transitions. Hard state transitions are facts there are
+ * imposed on DRBD by the environment. E.g. disk broke or network broke down.
+ * But those hard state transitions are still not allowed to do everything.
+ * @ns: new state.
+ * @os: old state.
+ */
+static enum drbd_state_rv
+is_valid_transition(union drbd_state os, union drbd_state ns)
+{
+ enum drbd_state_rv rv;
+
+ rv = is_valid_conn_transition(os.conn, ns.conn);
+
+ /* we cannot fail (again) if we already detached */
+ if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
+ rv = SS_IS_DISKLESS;
+
+ return rv;
+}
+
+static void print_sanitize_warnings(struct drbd_conf *mdev, enum sanitize_state_warnings warn)
+{
+ static const char *msg_table[] = {
+ [NO_WARNING] = "",
+ [ABORTED_ONLINE_VERIFY] = "Online-verify aborted.",
+ [ABORTED_RESYNC] = "Resync aborted.",
+ [CONNECTION_LOST_NEGOTIATING] = "Connection lost while negotiating, no data!",
+ [IMPLICITLY_UPGRADED_DISK] = "Implicitly upgraded disk",
+ [IMPLICITLY_UPGRADED_PDSK] = "Implicitly upgraded pdsk",
+ };
+
+ if (warn != NO_WARNING)
+ dev_warn(DEV, "%s\n", msg_table[warn]);
+}
+
+/**
+ * sanitize_state() - Resolves implicitly necessary additional changes to a state transition
+ * @mdev: DRBD device.
+ * @os: old state.
+ * @ns: new state.
+ * @warn_sync_abort:
+ *
+ * When we loose connection, we have to set the state of the peers disk (pdsk)
+ * to D_UNKNOWN. This rule and many more along those lines are in this function.
+ */
+static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
+ enum sanitize_state_warnings *warn)
+{
+ enum drbd_fencing_p fp;
+ enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
+
+ if (warn)
+ *warn = NO_WARNING;
+
+ fp = FP_DONT_CARE;
+ if (get_ldev(mdev)) {
+ rcu_read_lock();
+ fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
+ rcu_read_unlock();
+ put_ldev(mdev);
+ }
+
+ /* Implications from connection to peer and peer_isp */
+ if (ns.conn < C_CONNECTED) {
+ ns.peer_isp = 0;
+ ns.peer = R_UNKNOWN;
+ if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
+ ns.pdsk = D_UNKNOWN;
+ }
+
+ /* Clear the aftr_isp when becoming unconfigured */
+ if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
+ ns.aftr_isp = 0;
+
+ /* An implication of the disk states onto the connection state */
+ /* Abort resync if a disk fails/detaches */
+ if (ns.conn > C_CONNECTED && (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
+ if (warn)
+ *warn = ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ?
+ ABORTED_ONLINE_VERIFY : ABORTED_RESYNC;
+ ns.conn = C_CONNECTED;
+ }
+
+ /* Connection breaks down before we finished "Negotiating" */
+ if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
+ get_ldev_if_state(mdev, D_NEGOTIATING)) {
+ if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
+ ns.disk = mdev->new_state_tmp.disk;
+ ns.pdsk = mdev->new_state_tmp.pdsk;
+ } else {
+ if (warn)
+ *warn = CONNECTION_LOST_NEGOTIATING;
+ ns.disk = D_DISKLESS;
+ ns.pdsk = D_UNKNOWN;
+ }
+ put_ldev(mdev);
+ }
+
+ /* D_CONSISTENT and D_OUTDATED vanish when we get connected */
+ if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) {
+ if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED)
+ ns.disk = D_UP_TO_DATE;
+ if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)
+ ns.pdsk = D_UP_TO_DATE;
+ }
+
+ /* Implications of the connection stat on the disk states */
+ disk_min = D_DISKLESS;
+ disk_max = D_UP_TO_DATE;
+ pdsk_min = D_INCONSISTENT;
+ pdsk_max = D_UNKNOWN;
+ switch ((enum drbd_conns)ns.conn) {
+ case C_WF_BITMAP_T:
+ case C_PAUSED_SYNC_T:
+ case C_STARTING_SYNC_T:
+ case C_WF_SYNC_UUID:
+ case C_BEHIND:
+ disk_min = D_INCONSISTENT;
+ disk_max = D_OUTDATED;
+ pdsk_min = D_UP_TO_DATE;
+ pdsk_max = D_UP_TO_DATE;
+ break;
+ case C_VERIFY_S:
+ case C_VERIFY_T:
+ disk_min = D_UP_TO_DATE;
+ disk_max = D_UP_TO_DATE;
+ pdsk_min = D_UP_TO_DATE;
+ pdsk_max = D_UP_TO_DATE;
+ break;
+ case C_CONNECTED:
+ disk_min = D_DISKLESS;
+ disk_max = D_UP_TO_DATE;
+ pdsk_min = D_DISKLESS;
+ pdsk_max = D_UP_TO_DATE;
+ break;
+ case C_WF_BITMAP_S:
+ case C_PAUSED_SYNC_S:
+ case C_STARTING_SYNC_S:
+ case C_AHEAD:
+ disk_min = D_UP_TO_DATE;
+ disk_max = D_UP_TO_DATE;
+ pdsk_min = D_INCONSISTENT;
+ pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
+ break;
+ case C_SYNC_TARGET:
+ disk_min = D_INCONSISTENT;
+ disk_max = D_INCONSISTENT;
+ pdsk_min = D_UP_TO_DATE;
+ pdsk_max = D_UP_TO_DATE;
+ break;
+ case C_SYNC_SOURCE:
+ disk_min = D_UP_TO_DATE;
+ disk_max = D_UP_TO_DATE;
+ pdsk_min = D_INCONSISTENT;
+ pdsk_max = D_INCONSISTENT;
+ break;
+ case C_STANDALONE:
+ case C_DISCONNECTING:
+ case C_UNCONNECTED:
+ case C_TIMEOUT:
+ case C_BROKEN_PIPE:
+ case C_NETWORK_FAILURE:
+ case C_PROTOCOL_ERROR:
+ case C_TEAR_DOWN:
+ case C_WF_CONNECTION:
+ case C_WF_REPORT_PARAMS:
+ case C_MASK:
+ break;
+ }
+ if (ns.disk > disk_max)
+ ns.disk = disk_max;
+
+ if (ns.disk < disk_min) {
+ if (warn)
+ *warn = IMPLICITLY_UPGRADED_DISK;
+ ns.disk = disk_min;
+ }
+ if (ns.pdsk > pdsk_max)
+ ns.pdsk = pdsk_max;
+
+ if (ns.pdsk < pdsk_min) {
+ if (warn)
+ *warn = IMPLICITLY_UPGRADED_PDSK;
+ ns.pdsk = pdsk_min;
+ }
+
+ if (fp == FP_STONITH &&
+ (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED))
+ ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
+
+ if (mdev->tconn->res_opts.on_no_data == OND_SUSPEND_IO &&
+ (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
+ ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
+
+ if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
+ if (ns.conn == C_SYNC_SOURCE)
+ ns.conn = C_PAUSED_SYNC_S;
+ if (ns.conn == C_SYNC_TARGET)
+ ns.conn = C_PAUSED_SYNC_T;
+ } else {
+ if (ns.conn == C_PAUSED_SYNC_S)
+ ns.conn = C_SYNC_SOURCE;
+ if (ns.conn == C_PAUSED_SYNC_T)
+ ns.conn = C_SYNC_TARGET;
+ }
+
+ return ns;
+}
+
+void drbd_resume_al(struct drbd_conf *mdev)
+{
+ if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
+ dev_info(DEV, "Resumed AL updates\n");
+}
+
+/* helper for __drbd_set_state */
+static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
+{
+ if (mdev->tconn->agreed_pro_version < 90)
+ mdev->ov_start_sector = 0;
+ mdev->rs_total = drbd_bm_bits(mdev);
+ mdev->ov_position = 0;
+ if (cs == C_VERIFY_T) {
+ /* starting online verify from an arbitrary position
+ * does not fit well into the existing protocol.
+ * on C_VERIFY_T, we initialize ov_left and friends
+ * implicitly in receive_DataRequest once the
+ * first P_OV_REQUEST is received */
+ mdev->ov_start_sector = ~(sector_t)0;
+ } else {
+ unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
+ if (bit >= mdev->rs_total) {
+ mdev->ov_start_sector =
+ BM_BIT_TO_SECT(mdev->rs_total - 1);
+ mdev->rs_total = 1;
+ } else
+ mdev->rs_total -= bit;
+ mdev->ov_position = mdev->ov_start_sector;
+ }
+ mdev->ov_left = mdev->rs_total;
+}
+
+/**
+ * __drbd_set_state() - Set a new DRBD state
+ * @mdev: DRBD device.
+ * @ns: new state.
+ * @flags: Flags
+ * @done: Optional completion, that will get completed after the after_state_ch() finished
+ *
+ * Caller needs to hold req_lock, and global_state_lock. Do not call directly.
+ */
+enum drbd_state_rv
+__drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
+ enum chg_state_flags flags, struct completion *done)
+{
+ union drbd_state os;
+ enum drbd_state_rv rv = SS_SUCCESS;
+ enum sanitize_state_warnings ssw;
+ struct after_state_chg_work *ascw;
+
+ os = drbd_read_state(mdev);
+
+ ns = sanitize_state(mdev, ns, &ssw);
+ if (ns.i == os.i)
+ return SS_NOTHING_TO_DO;
+
+ rv = is_valid_transition(os, ns);
+ if (rv < SS_SUCCESS)
+ return rv;
+
+ if (!(flags & CS_HARD)) {
+ /* pre-state-change checks ; only look at ns */
+ /* See drbd_state_sw_errors in drbd_strings.c */
+
+ rv = is_valid_state(mdev, ns);
+ if (rv < SS_SUCCESS) {
+ /* If the old state was illegal as well, then let
+ this happen...*/
+
+ if (is_valid_state(mdev, os) == rv)
+ rv = is_valid_soft_transition(os, ns, mdev->tconn);
+ } else
+ rv = is_valid_soft_transition(os, ns, mdev->tconn);
+ }
+
+ if (rv < SS_SUCCESS) {
+ if (flags & CS_VERBOSE)
+ print_st_err(mdev, os, ns, rv);
+ return rv;
+ }
+
+ print_sanitize_warnings(mdev, ssw);
+
+ drbd_pr_state_change(mdev, os, ns, flags);
+
+ /* Display changes to the susp* flags that where caused by the call to
+ sanitize_state(). Only display it here if we where not called from
+ _conn_request_state() */
+ if (!(flags & CS_DC_SUSP))
+ conn_pr_state_change(mdev->tconn, os, ns, (flags & ~CS_DC_MASK) | CS_DC_SUSP);
+
+ /* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
+ * on the ldev here, to be sure the transition -> D_DISKLESS resp.
+ * drbd_ldev_destroy() won't happen before our corresponding
+ * after_state_ch works run, where we put_ldev again. */
+ if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
+ (os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
+ atomic_inc(&mdev->local_cnt);
+
+ mdev->state.i = ns.i;
+ mdev->tconn->susp = ns.susp;
+ mdev->tconn->susp_nod = ns.susp_nod;
+ mdev->tconn->susp_fen = ns.susp_fen;
+
+ if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING)
+ drbd_print_uuids(mdev, "attached to UUIDs");
+
+ /* Wake up role changes, that were delayed because of connection establishing */
+ if (os.conn == C_WF_REPORT_PARAMS && ns.conn != C_WF_REPORT_PARAMS &&
+ no_peer_wf_report_params(mdev->tconn))
+ clear_bit(STATE_SENT, &mdev->tconn->flags);
+
+ wake_up(&mdev->misc_wait);
+ wake_up(&mdev->state_wait);
+ wake_up(&mdev->tconn->ping_wait);
+
+ /* Aborted verify run, or we reached the stop sector.
+ * Log the last position, unless end-of-device. */
+ if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
+ ns.conn <= C_CONNECTED) {
+ mdev->ov_start_sector =
+ BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
+ if (mdev->ov_left)
+ dev_info(DEV, "Online Verify reached sector %llu\n",
+ (unsigned long long)mdev->ov_start_sector);
+ }
+
+ if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
+ (ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
+ dev_info(DEV, "Syncer continues.\n");
+ mdev->rs_paused += (long)jiffies
+ -(long)mdev->rs_mark_time[mdev->rs_last_mark];
+ if (ns.conn == C_SYNC_TARGET)
+ mod_timer(&mdev->resync_timer, jiffies);
+ }
+
+ if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
+ (ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
+ dev_info(DEV, "Resync suspended\n");
+ mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
+ }
+
+ if (os.conn == C_CONNECTED &&
+ (ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
+ unsigned long now = jiffies;
+ int i;
+
+ set_ov_position(mdev, ns.conn);
+ mdev->rs_start = now;
+ mdev->rs_last_events = 0;
+ mdev->rs_last_sect_ev = 0;
+ mdev->ov_last_oos_size = 0;
+ mdev->ov_last_oos_start = 0;
+
+ for (i = 0; i < DRBD_SYNC_MARKS; i++) {
+ mdev->rs_mark_left[i] = mdev->ov_left;
+ mdev->rs_mark_time[i] = now;
+ }
+
+ drbd_rs_controller_reset(mdev);
+
+ if (ns.conn == C_VERIFY_S) {
+ dev_info(DEV, "Starting Online Verify from sector %llu\n",
+ (unsigned long long)mdev->ov_position);
+ mod_timer(&mdev->resync_timer, jiffies);
+ }
+ }
+
+ if (get_ldev(mdev)) {
+ u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
+ MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
+ MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
+
+ mdf &= ~MDF_AL_CLEAN;
+ if (test_bit(CRASHED_PRIMARY, &mdev->flags))
+ mdf |= MDF_CRASHED_PRIMARY;
+ if (mdev->state.role == R_PRIMARY ||
+ (mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
+ mdf |= MDF_PRIMARY_IND;
+ if (mdev->state.conn > C_WF_REPORT_PARAMS)
+ mdf |= MDF_CONNECTED_IND;
+ if (mdev->state.disk > D_INCONSISTENT)
+ mdf |= MDF_CONSISTENT;
+ if (mdev->state.disk > D_OUTDATED)
+ mdf |= MDF_WAS_UP_TO_DATE;
+ if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
+ mdf |= MDF_PEER_OUT_DATED;
+ if (mdf != mdev->ldev->md.flags) {
+ mdev->ldev->md.flags = mdf;
+ drbd_md_mark_dirty(mdev);
+ }
+ if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
+ drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
+ put_ldev(mdev);
+ }
+
+ /* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
+ if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
+ os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
+ set_bit(CONSIDER_RESYNC, &mdev->flags);
+
+ /* Receiver should clean up itself */
+ if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
+ drbd_thread_stop_nowait(&mdev->tconn->receiver);
+
+ /* Now the receiver finished cleaning up itself, it should die */
+ if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
+ drbd_thread_stop_nowait(&mdev->tconn->receiver);
+
+ /* Upon network failure, we need to restart the receiver. */
+ if (os.conn > C_WF_CONNECTION &&
+ ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
+ drbd_thread_restart_nowait(&mdev->tconn->receiver);
+
+ /* Resume AL writing if we get a connection */
+ if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
+ drbd_resume_al(mdev);
+
+ /* remember last attach time so request_timer_fn() won't
+ * kill newly established sessions while we are still trying to thaw
+ * previously frozen IO */
+ if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
+ ns.disk > D_NEGOTIATING)
+ mdev->last_reattach_jif = jiffies;
+
+ ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
+ if (ascw) {
+ ascw->os = os;
+ ascw->ns = ns;
+ ascw->flags = flags;
+ ascw->w.cb = w_after_state_ch;
+ ascw->w.mdev = mdev;
+ ascw->done = done;
+ drbd_queue_work(&mdev->tconn->sender_work, &ascw->w);
+ } else {
+ dev_err(DEV, "Could not kmalloc an ascw\n");
+ }
+
+ return rv;
+}
+
+static int w_after_state_ch(struct drbd_work *w, int unused)
+{
+ struct after_state_chg_work *ascw =
+ container_of(w, struct after_state_chg_work, w);
+ struct drbd_conf *mdev = w->mdev;
+
+ after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
+ if (ascw->flags & CS_WAIT_COMPLETE) {
+ D_ASSERT(ascw->done != NULL);
+ complete(ascw->done);
+ }
+ kfree(ascw);
+
+ return 0;
+}
+
+static void abw_start_sync(struct drbd_conf *mdev, int rv)
+{
+ if (rv) {
+ dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
+ _drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
+ return;
+ }
+
+ switch (mdev->state.conn) {
+ case C_STARTING_SYNC_T:
+ _drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
+ break;
+ case C_STARTING_SYNC_S:
+ drbd_start_resync(mdev, C_SYNC_SOURCE);
+ break;
+ }
+}
+
+int drbd_bitmap_io_from_worker(struct drbd_conf *mdev,
+ int (*io_fn)(struct drbd_conf *),
+ char *why, enum bm_flag flags)
+{
+ int rv;
+
+ D_ASSERT(current == mdev->tconn->worker.task);
+
+ /* open coded non-blocking drbd_suspend_io(mdev); */
+ set_bit(SUSPEND_IO, &mdev->flags);
+
+ drbd_bm_lock(mdev, why, flags);
+ rv = io_fn(mdev);
+ drbd_bm_unlock(mdev);
+
+ drbd_resume_io(mdev);
+
+ return rv;
+}
+
+/**
+ * after_state_ch() - Perform after state change actions that may sleep
+ * @mdev: DRBD device.
+ * @os: old state.
+ * @ns: new state.
+ * @flags: Flags
+ */
+static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
+ union drbd_state ns, enum chg_state_flags flags)
+{
+ struct sib_info sib;
+
+ sib.sib_reason = SIB_STATE_CHANGE;
+ sib.os = os;
+ sib.ns = ns;
+
+ if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
+ clear_bit(CRASHED_PRIMARY, &mdev->flags);
+ if (mdev->p_uuid)
+ mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
+ }
+
+ /* Inform userspace about the change... */
+ drbd_bcast_event(mdev, &sib);
+
+ if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
+ (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
+ drbd_khelper(mdev, "pri-on-incon-degr");
+
+ /* Here we have the actions that are performed after a
+ state change. This function might sleep */
+
+ if (ns.susp_nod) {
+ struct drbd_tconn *tconn = mdev->tconn;
+ enum drbd_req_event what = NOTHING;
+
+ spin_lock_irq(&tconn->req_lock);
+ if (os.conn < C_CONNECTED && conn_lowest_conn(tconn) >= C_CONNECTED)
+ what = RESEND;
+
+ if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) &&
+ conn_lowest_disk(tconn) > D_NEGOTIATING)
+ what = RESTART_FROZEN_DISK_IO;
+
+ if (tconn->susp_nod && what != NOTHING) {
+ _tl_restart(tconn, what);
+ _conn_request_state(tconn,
+ (union drbd_state) { { .susp_nod = 1 } },
+ (union drbd_state) { { .susp_nod = 0 } },
+ CS_VERBOSE);
+ }
+ spin_unlock_irq(&tconn->req_lock);
+ }
+
+ if (ns.susp_fen) {
+ struct drbd_tconn *tconn = mdev->tconn;
+
+ spin_lock_irq(&tconn->req_lock);
+ if (tconn->susp_fen && conn_lowest_conn(tconn) >= C_CONNECTED) {
+ /* case2: The connection was established again: */
+ struct drbd_conf *odev;
+ int vnr;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, odev, vnr)
+ clear_bit(NEW_CUR_UUID, &odev->flags);
+ rcu_read_unlock();
+ _tl_restart(tconn, RESEND);
+ _conn_request_state(tconn,
+ (union drbd_state) { { .susp_fen = 1 } },
+ (union drbd_state) { { .susp_fen = 0 } },
+ CS_VERBOSE);
+ }
+ spin_unlock_irq(&tconn->req_lock);
+ }
+
+ /* Became sync source. With protocol >= 96, we still need to send out
+ * the sync uuid now. Need to do that before any drbd_send_state, or
+ * the other side may go "paused sync" before receiving the sync uuids,
+ * which is unexpected. */
+ if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
+ (ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
+ mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) {
+ drbd_gen_and_send_sync_uuid(mdev);
+ put_ldev(mdev);
+ }
+
+ /* Do not change the order of the if above and the two below... */
+ if (os.pdsk == D_DISKLESS &&
+ ns.pdsk > D_DISKLESS && ns.pdsk != D_UNKNOWN) { /* attach on the peer */
+ /* we probably will start a resync soon.
+ * make sure those things are properly reset. */
+ mdev->rs_total = 0;
+ mdev->rs_failed = 0;
+ atomic_set(&mdev->rs_pending_cnt, 0);
+ drbd_rs_cancel_all(mdev);
+
+ drbd_send_uuids(mdev);
+ drbd_send_state(mdev, ns);
+ }
+ /* No point in queuing send_bitmap if we don't have a connection
+ * anymore, so check also the _current_ state, not only the new state
+ * at the time this work was queued. */
+ if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
+ mdev->state.conn == C_WF_BITMAP_S)
+ drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
+ "send_bitmap (WFBitMapS)",
+ BM_LOCKED_TEST_ALLOWED);
+
+ /* Lost contact to peer's copy of the data */
+ if ((os.pdsk >= D_INCONSISTENT &&
+ os.pdsk != D_UNKNOWN &&
+ os.pdsk != D_OUTDATED)
+ && (ns.pdsk < D_INCONSISTENT ||
+ ns.pdsk == D_UNKNOWN ||
+ ns.pdsk == D_OUTDATED)) {
+ if (get_ldev(mdev)) {
+ if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
+ mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
+ if (drbd_suspended(mdev)) {
+ set_bit(NEW_CUR_UUID, &mdev->flags);
+ } else {
+ drbd_uuid_new_current(mdev);
+ drbd_send_uuids(mdev);
+ }
+ }
+ put_ldev(mdev);
+ }
+ }
+
+ if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
+ if (os.peer == R_SECONDARY && ns.peer == R_PRIMARY &&
+ mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
+ drbd_uuid_new_current(mdev);
+ drbd_send_uuids(mdev);
+ }
+ /* D_DISKLESS Peer becomes secondary */
+ if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
+ /* We may still be Primary ourselves.
+ * No harm done if the bitmap still changes,
+ * redirtied pages will follow later. */
+ drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
+ "demote diskless peer", BM_LOCKED_SET_ALLOWED);
+ put_ldev(mdev);
+ }
+
+ /* Write out all changed bits on demote.
+ * Though, no need to da that just yet
+ * if there is a resync going on still */
+ if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
+ mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
+ /* No changes to the bitmap expected this time, so assert that,
+ * even though no harm was done if it did change. */
+ drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
+ "demote", BM_LOCKED_TEST_ALLOWED);
+ put_ldev(mdev);
+ }
+
+ /* Last part of the attaching process ... */
+ if (ns.conn >= C_CONNECTED &&
+ os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
+ drbd_send_sizes(mdev, 0, 0); /* to start sync... */
+ drbd_send_uuids(mdev);
+ drbd_send_state(mdev, ns);
+ }
+
+ /* We want to pause/continue resync, tell peer. */
+ if (ns.conn >= C_CONNECTED &&
+ ((os.aftr_isp != ns.aftr_isp) ||
+ (os.user_isp != ns.user_isp)))
+ drbd_send_state(mdev, ns);
+
+ /* In case one of the isp bits got set, suspend other devices. */
+ if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
+ (ns.aftr_isp || ns.peer_isp || ns.user_isp))
+ suspend_other_sg(mdev);
+
+ /* Make sure the peer gets informed about eventual state
+ changes (ISP bits) while we were in WFReportParams. */
+ if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
+ drbd_send_state(mdev, ns);
+
+ if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
+ drbd_send_state(mdev, ns);
+
+ /* We are in the progress to start a full sync... */
+ if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
+ (os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
+ /* no other bitmap changes expected during this phase */
+ drbd_queue_bitmap_io(mdev,
+ &drbd_bmio_set_n_write, &abw_start_sync,
+ "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED);
+
+ /* We are invalidating our self... */
+ if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
+ os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
+ /* other bitmap operation expected during this phase */
+ drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL,
+ "set_n_write from invalidate", BM_LOCKED_MASK);
+
+ /* first half of local IO error, failure to attach,
+ * or administrative detach */
+ if (os.disk != D_FAILED && ns.disk == D_FAILED) {
+ enum drbd_io_error_p eh = EP_PASS_ON;
+ int was_io_error = 0;
+ /* corresponding get_ldev was in __drbd_set_state, to serialize
+ * our cleanup here with the transition to D_DISKLESS.
+ * But is is still not save to dreference ldev here, since
+ * we might come from an failed Attach before ldev was set. */
+ if (mdev->ldev) {
+ rcu_read_lock();
+ eh = rcu_dereference(mdev->ldev->disk_conf)->on_io_error;
+ rcu_read_unlock();
+
+ was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
+
+ if (was_io_error && eh == EP_CALL_HELPER)
+ drbd_khelper(mdev, "local-io-error");
+
+ /* Immediately allow completion of all application IO,
+ * that waits for completion from the local disk,
+ * if this was a force-detach due to disk_timeout
+ * or administrator request (drbdsetup detach --force).
+ * Do NOT abort otherwise.
+ * Aborting local requests may cause serious problems,
+ * if requests are completed to upper layers already,
+ * and then later the already submitted local bio completes.
+ * This can cause DMA into former bio pages that meanwhile
+ * have been re-used for other things.
+ * So aborting local requests may cause crashes,
+ * or even worse, silent data corruption.
+ */
+ if (test_and_clear_bit(FORCE_DETACH, &mdev->flags))
+ tl_abort_disk_io(mdev);
+
+ /* current state still has to be D_FAILED,
+ * there is only one way out: to D_DISKLESS,
+ * and that may only happen after our put_ldev below. */
+ if (mdev->state.disk != D_FAILED)
+ dev_err(DEV,
+ "ASSERT FAILED: disk is %s during detach\n",
+ drbd_disk_str(mdev->state.disk));
+
+ if (ns.conn >= C_CONNECTED)
+ drbd_send_state(mdev, ns);
+
+ drbd_rs_cancel_all(mdev);
+
+ /* In case we want to get something to stable storage still,
+ * this may be the last chance.
+ * Following put_ldev may transition to D_DISKLESS. */
+ drbd_md_sync(mdev);
+ }
+ put_ldev(mdev);
+ }
+
+ /* second half of local IO error, failure to attach,
+ * or administrative detach,
+ * after local_cnt references have reached zero again */
+ if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
+ /* We must still be diskless,
+ * re-attach has to be serialized with this! */
+ if (mdev->state.disk != D_DISKLESS)
+ dev_err(DEV,
+ "ASSERT FAILED: disk is %s while going diskless\n",
+ drbd_disk_str(mdev->state.disk));
+
+ if (ns.conn >= C_CONNECTED)
+ drbd_send_state(mdev, ns);
+ /* corresponding get_ldev in __drbd_set_state
+ * this may finally trigger drbd_ldev_destroy. */
+ put_ldev(mdev);
+ }
+
+ /* Notify peer that I had a local IO error, and did not detached.. */
+ if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT && ns.conn >= C_CONNECTED)
+ drbd_send_state(mdev, ns);
+
+ /* Disks got bigger while they were detached */
+ if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
+ test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
+ if (ns.conn == C_CONNECTED)
+ resync_after_online_grow(mdev);
+ }
+
+ /* A resync finished or aborted, wake paused devices... */
+ if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
+ (os.peer_isp && !ns.peer_isp) ||
+ (os.user_isp && !ns.user_isp))
+ resume_next_sg(mdev);
+
+ /* sync target done with resync. Explicitly notify peer, even though
+ * it should (at least for non-empty resyncs) already know itself. */
+ if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
+ drbd_send_state(mdev, ns);
+
+ /* Verify finished, or reached stop sector. Peer did not know about
+ * the stop sector, and we may even have changed the stop sector during
+ * verify to interrupt/stop early. Send the new state. */
+ if (os.conn == C_VERIFY_S && ns.conn == C_CONNECTED
+ && verify_can_do_stop_sector(mdev))
+ drbd_send_state(mdev, ns);
+
+ /* This triggers bitmap writeout of potentially still unwritten pages
+ * if the resync finished cleanly, or aborted because of peer disk
+ * failure, or because of connection loss.
+ * For resync aborted because of local disk failure, we cannot do
+ * any bitmap writeout anymore.
+ * No harm done if some bits change during this phase.
+ */
+ if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) {
+ drbd_queue_bitmap_io(mdev, &drbd_bm_write_copy_pages, NULL,
+ "write from resync_finished", BM_LOCKED_CHANGE_ALLOWED);
+ put_ldev(mdev);
+ }
+
+ if (ns.disk == D_DISKLESS &&
+ ns.conn == C_STANDALONE &&
+ ns.role == R_SECONDARY) {
+ if (os.aftr_isp != ns.aftr_isp)
+ resume_next_sg(mdev);
+ }
+
+ drbd_md_sync(mdev);
+}
+
+struct after_conn_state_chg_work {
+ struct drbd_work w;
+ enum drbd_conns oc;
+ union drbd_state ns_min;
+ union drbd_state ns_max; /* new, max state, over all mdevs */
+ enum chg_state_flags flags;
+};
+
+static int w_after_conn_state_ch(struct drbd_work *w, int unused)
+{
+ struct after_conn_state_chg_work *acscw =
+ container_of(w, struct after_conn_state_chg_work, w);
+ struct drbd_tconn *tconn = w->tconn;
+ enum drbd_conns oc = acscw->oc;
+ union drbd_state ns_max = acscw->ns_max;
+ struct drbd_conf *mdev;
+ int vnr;
+
+ kfree(acscw);
+
+ /* Upon network configuration, we need to start the receiver */
+ if (oc == C_STANDALONE && ns_max.conn == C_UNCONNECTED)
+ drbd_thread_start(&tconn->receiver);
+
+ if (oc == C_DISCONNECTING && ns_max.conn == C_STANDALONE) {
+ struct net_conf *old_conf;
+
+ mutex_lock(&tconn->conf_update);
+ old_conf = tconn->net_conf;
+ tconn->my_addr_len = 0;
+ tconn->peer_addr_len = 0;
+ rcu_assign_pointer(tconn->net_conf, NULL);
+ conn_free_crypto(tconn);
+ mutex_unlock(&tconn->conf_update);
+
+ synchronize_rcu();
+ kfree(old_conf);
+ }
+
+ if (ns_max.susp_fen) {
+ /* case1: The outdate peer handler is successful: */
+ if (ns_max.pdsk <= D_OUTDATED) {
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr) {
+ if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
+ drbd_uuid_new_current(mdev);
+ clear_bit(NEW_CUR_UUID, &mdev->flags);
+ }
+ }
+ rcu_read_unlock();
+ spin_lock_irq(&tconn->req_lock);
+ _tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING);
+ _conn_request_state(tconn,
+ (union drbd_state) { { .susp_fen = 1 } },
+ (union drbd_state) { { .susp_fen = 0 } },
+ CS_VERBOSE);
+ spin_unlock_irq(&tconn->req_lock);
+ }
+ }
+ kref_put(&tconn->kref, &conn_destroy);
+
+ conn_md_sync(tconn);
+
+ return 0;
+}
+
+void conn_old_common_state(struct drbd_tconn *tconn, union drbd_state *pcs, enum chg_state_flags *pf)
+{
+ enum chg_state_flags flags = ~0;
+ struct drbd_conf *mdev;
+ int vnr, first_vol = 1;
+ union drbd_dev_state os, cs = {
+ { .role = R_SECONDARY,
+ .peer = R_UNKNOWN,
+ .conn = tconn->cstate,
+ .disk = D_DISKLESS,
+ .pdsk = D_UNKNOWN,
+ } };
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr) {
+ os = mdev->state;
+
+ if (first_vol) {
+ cs = os;
+ first_vol = 0;
+ continue;
+ }
+
+ if (cs.role != os.role)
+ flags &= ~CS_DC_ROLE;
+
+ if (cs.peer != os.peer)
+ flags &= ~CS_DC_PEER;
+
+ if (cs.conn != os.conn)
+ flags &= ~CS_DC_CONN;
+
+ if (cs.disk != os.disk)
+ flags &= ~CS_DC_DISK;
+
+ if (cs.pdsk != os.pdsk)
+ flags &= ~CS_DC_PDSK;
+ }
+ rcu_read_unlock();
+
+ *pf |= CS_DC_MASK;
+ *pf &= flags;
+ (*pcs).i = cs.i;
+}
+
+static enum drbd_state_rv
+conn_is_valid_transition(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
+ enum chg_state_flags flags)
+{
+ enum drbd_state_rv rv = SS_SUCCESS;
+ union drbd_state ns, os;
+ struct drbd_conf *mdev;
+ int vnr;
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr) {
+ os = drbd_read_state(mdev);
+ ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
+
+ if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
+ ns.disk = os.disk;
+
+ if (ns.i == os.i)
+ continue;
+
+ rv = is_valid_transition(os, ns);
+ if (rv < SS_SUCCESS)
+ break;
+
+ if (!(flags & CS_HARD)) {
+ rv = is_valid_state(mdev, ns);
+ if (rv < SS_SUCCESS) {
+ if (is_valid_state(mdev, os) == rv)
+ rv = is_valid_soft_transition(os, ns, tconn);
+ } else
+ rv = is_valid_soft_transition(os, ns, tconn);
+ }
+ if (rv < SS_SUCCESS)
+ break;
+ }
+ rcu_read_unlock();
+
+ if (rv < SS_SUCCESS && flags & CS_VERBOSE)
+ print_st_err(mdev, os, ns, rv);
+
+ return rv;
+}
+
+void
+conn_set_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
+ union drbd_state *pns_min, union drbd_state *pns_max, enum chg_state_flags flags)
+{
+ union drbd_state ns, os, ns_max = { };
+ union drbd_state ns_min = {
+ { .role = R_MASK,
+ .peer = R_MASK,
+ .conn = val.conn,
+ .disk = D_MASK,
+ .pdsk = D_MASK
+ } };
+ struct drbd_conf *mdev;
+ enum drbd_state_rv rv;
+ int vnr, number_of_volumes = 0;
+
+ if (mask.conn == C_MASK) {
+ /* remember last connect time so request_timer_fn() won't
+ * kill newly established sessions while we are still trying to thaw
+ * previously frozen IO */
+ if (tconn->cstate != C_WF_REPORT_PARAMS && val.conn == C_WF_REPORT_PARAMS)
+ tconn->last_reconnect_jif = jiffies;
+
+ tconn->cstate = val.conn;
+ }
+
+ rcu_read_lock();
+ idr_for_each_entry(&tconn->volumes, mdev, vnr) {
+ number_of_volumes++;
+ os = drbd_read_state(mdev);
+ ns = apply_mask_val(os, mask, val);
+ ns = sanitize_state(mdev, ns, NULL);
+
+ if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
+ ns.disk = os.disk;
+
+ rv = __drbd_set_state(mdev, ns, flags, NULL);
+ if (rv < SS_SUCCESS)
+ BUG();
+
+ ns.i = mdev->state.i;
+ ns_max.role = max_role(ns.role, ns_max.role);
+ ns_max.peer = max_role(ns.peer, ns_max.peer);
+ ns_max.conn = max_t(enum drbd_conns, ns.conn, ns_max.conn);
+ ns_max.disk = max_t(enum drbd_disk_state, ns.disk, ns_max.disk);
+ ns_max.pdsk = max_t(enum drbd_disk_state, ns.pdsk, ns_max.pdsk);
+
+ ns_min.role = min_role(ns.role, ns_min.role);
+ ns_min.peer = min_role(ns.peer, ns_min.peer);
+ ns_min.conn = min_t(enum drbd_conns, ns.conn, ns_min.conn);
+ ns_min.disk = min_t(enum drbd_disk_state, ns.disk, ns_min.disk);
+ ns_min.pdsk = min_t(enum drbd_disk_state, ns.pdsk, ns_min.pdsk);
+ }
+ rcu_read_unlock();
+
+ if (number_of_volumes == 0) {
+ ns_min = ns_max = (union drbd_state) { {
+ .role = R_SECONDARY,
+ .peer = R_UNKNOWN,
+ .conn = val.conn,
+ .disk = D_DISKLESS,
+ .pdsk = D_UNKNOWN
+ } };
+ }
+
+ ns_min.susp = ns_max.susp = tconn->susp;
+ ns_min.susp_nod = ns_max.susp_nod = tconn->susp_nod;
+ ns_min.susp_fen = ns_max.susp_fen = tconn->susp_fen;
+
+ *pns_min = ns_min;
+ *pns_max = ns_max;
+}
+
+static enum drbd_state_rv
+_conn_rq_cond(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val)
+{
+ enum drbd_state_rv rv;
+
+ if (test_and_clear_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags))
+ return SS_CW_SUCCESS;
+
+ if (test_and_clear_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags))
+ return SS_CW_FAILED_BY_PEER;
+
+ rv = tconn->cstate != C_WF_REPORT_PARAMS ? SS_CW_NO_NEED : SS_UNKNOWN_ERROR;
+
+ if (rv == SS_UNKNOWN_ERROR)
+ rv = conn_is_valid_transition(tconn, mask, val, 0);
+
+ if (rv == SS_SUCCESS)
+ rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
+
+ return rv;
+}
+
+enum drbd_state_rv
+_conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
+ enum chg_state_flags flags)
+{
+ enum drbd_state_rv rv = SS_SUCCESS;
+ struct after_conn_state_chg_work *acscw;
+ enum drbd_conns oc = tconn->cstate;
+ union drbd_state ns_max, ns_min, os;
+ bool have_mutex = false;
+
+ if (mask.conn) {
+ rv = is_valid_conn_transition(oc, val.conn);
+ if (rv < SS_SUCCESS)
+ goto abort;
+ }
+
+ rv = conn_is_valid_transition(tconn, mask, val, flags);
+ if (rv < SS_SUCCESS)
+ goto abort;
+
+ if (oc == C_WF_REPORT_PARAMS && val.conn == C_DISCONNECTING &&
+ !(flags & (CS_LOCAL_ONLY | CS_HARD))) {
+
+ /* This will be a cluster-wide state change.
+ * Need to give up the spinlock, grab the mutex,
+ * then send the state change request, ... */
+ spin_unlock_irq(&tconn->req_lock);
+ mutex_lock(&tconn->cstate_mutex);
+ have_mutex = true;
+
+ set_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
+ if (conn_send_state_req(tconn, mask, val)) {
+ /* sending failed. */
+ clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
+ rv = SS_CW_FAILED_BY_PEER;
+ /* need to re-aquire the spin lock, though */
+ goto abort_unlocked;
+ }
+
+ if (val.conn == C_DISCONNECTING)
+ set_bit(DISCONNECT_SENT, &tconn->flags);
+
+ /* ... and re-aquire the spinlock.
+ * If _conn_rq_cond() returned >= SS_SUCCESS, we must call
+ * conn_set_state() within the same spinlock. */
+ spin_lock_irq(&tconn->req_lock);
+ wait_event_lock_irq(tconn->ping_wait,
+ (rv = _conn_rq_cond(tconn, mask, val)),
+ tconn->req_lock,
+ );
+ clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
+ if (rv < SS_SUCCESS)
+ goto abort;
+ }
+
+ conn_old_common_state(tconn, &os, &flags);
+ flags |= CS_DC_SUSP;
+ conn_set_state(tconn, mask, val, &ns_min, &ns_max, flags);
+ conn_pr_state_change(tconn, os, ns_max, flags);
+
+ acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC);
+ if (acscw) {
+ acscw->oc = os.conn;
+ acscw->ns_min = ns_min;
+ acscw->ns_max = ns_max;
+ acscw->flags = flags;
+ acscw->w.cb = w_after_conn_state_ch;
+ kref_get(&tconn->kref);
+ acscw->w.tconn = tconn;
+ drbd_queue_work(&tconn->sender_work, &acscw->w);
+ } else {
+ conn_err(tconn, "Could not kmalloc an acscw\n");
+ }
+
+ abort:
+ if (have_mutex) {
+ /* mutex_unlock() "... must not be used in interrupt context.",
+ * so give up the spinlock, then re-aquire it */
+ spin_unlock_irq(&tconn->req_lock);
+ abort_unlocked:
+ mutex_unlock(&tconn->cstate_mutex);
+ spin_lock_irq(&tconn->req_lock);
+ }
+ if (rv < SS_SUCCESS && flags & CS_VERBOSE) {
+ conn_err(tconn, "State change failed: %s\n", drbd_set_st_err_str(rv));
+ conn_err(tconn, " mask = 0x%x val = 0x%x\n", mask.i, val.i);
+ conn_err(tconn, " old_conn:%s wanted_conn:%s\n", drbd_conn_str(oc), drbd_conn_str(val.conn));
+ }
+ return rv;
+}
+
+enum drbd_state_rv
+conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val,
+ enum chg_state_flags flags)
+{
+ enum drbd_state_rv rv;
+
+ spin_lock_irq(&tconn->req_lock);
+ rv = _conn_request_state(tconn, mask, val, flags);
+ spin_unlock_irq(&tconn->req_lock);
+
+ return rv;
+}