/* 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 . Copyright (C) 2002-2008, Lars Ellenberg . 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 #include "drbd_int.h" #include "drbd_req.h" 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; }; extern void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what); 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 void after_all_state_ch(struct drbd_tconn *tconn, union drbd_state ns); 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); 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, const char **warn_sync_abort); /** * 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_DISKLESS && ns.disk == D_DISKLESS))) || (os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) || (os.conn == C_CONNECTED && ns.conn == C_VERIFY_S); } 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(mdev->state, mask, val); rv = _drbd_set_state(mdev, ns, f, NULL); ns = mdev->state; 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 = mdev->state; 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); 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 = mdev->state; ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL); rv = is_valid_transition(os, ns); if (rv < SS_SUCCESS) 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); 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(mdev->state, 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 void print_state_change(struct drbd_conf *mdev, union drbd_state os, union drbd_state ns, enum chg_state_flags flags) { char *pbp, pb[300]; pbp = pb; *pbp = 0; if (ns.role != os.role) pbp += sprintf(pbp, "role( %s -> %s ) ", drbd_role_str(os.role), drbd_role_str(ns.role)); if (ns.peer != os.peer) pbp += sprintf(pbp, "peer( %s -> %s ) ", drbd_role_str(os.peer), drbd_role_str(ns.peer)); if (ns.conn != os.conn && !(flags & CS_NO_CSTATE_CHG)) pbp += sprintf(pbp, "conn( %s -> %s ) ", drbd_conn_str(os.conn), drbd_conn_str(ns.conn)); if (ns.disk != os.disk) pbp += sprintf(pbp, "disk( %s -> %s ) ", drbd_disk_str(os.disk), drbd_disk_str(ns.disk)); if (ns.pdsk != os.pdsk) pbp += sprintf(pbp, "pdsk( %s -> %s ) ", drbd_disk_str(os.pdsk), drbd_disk_str(ns.pdsk)); if (is_susp(ns) != is_susp(os)) pbp += sprintf(pbp, "susp( %d -> %d ) ", is_susp(os), is_susp(ns)); 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); } /** * 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; fp = FP_DONT_CARE; if (get_ldev(mdev)) { fp = mdev->ldev->dc.fencing; put_ldev(mdev); } if (get_net_conf(mdev->tconn)) { if (!mdev->tconn->net_conf->two_primaries && ns.role == R_PRIMARY && ns.peer == R_PRIMARY) rv = SS_TWO_PRIMARIES; put_net_conf(mdev->tconn); } 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) && (mdev->sync_conf.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; 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) { 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; 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) { enum drbd_state_rv rv = SS_SUCCESS; /* Disallow Network errors to configure a device's network part */ if ((nc >= C_TIMEOUT && nc <= C_TEAR_DOWN) && oc <= C_DISCONNECTING) rv = 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) rv = SS_IN_TRANSIENT_STATE; /* After C_DISCONNECTING only C_STANDALONE may follow */ if (oc == C_DISCONNECTING && nc != C_STANDALONE) rv = SS_IN_TRANSIENT_STATE; return rv; } /** * 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; /* if we are only D_ATTACHING yet, * we can (and should) go directly to D_DISKLESS. */ if (ns.disk == D_FAILED && os.disk == D_ATTACHING) { printk("TODO: FIX ME\n"); rv = SS_IS_DISKLESS; } return rv; } /** * 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, const char **warn_sync_abort) { enum drbd_fencing_p fp; enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max; fp = FP_DONT_CARE; if (get_ldev(mdev)) { fp = mdev->ldev->dc.fencing; 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_sync_abort) *warn_sync_abort = ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ? "Online-verify" : "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 { dev_alert(DEV, "Connection lost while negotiating, no data!\n"); 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) { dev_warn(DEV, "Implicitly set disk from %s to %s\n", drbd_disk_str(ns.disk), drbd_disk_str(disk_min)); ns.disk = disk_min; } if (ns.pdsk > pdsk_max) ns.pdsk = pdsk_max; if (ns.pdsk < pdsk_min) { dev_warn(DEV, "Implicitly set pdsk from %s to %s\n", drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min)); 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->sync_conf.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; const char *warn_sync_abort = NULL; struct after_state_chg_work *ascw; os = mdev->state; ns = sanitize_state(mdev, ns, &warn_sync_abort); 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); } else rv = is_valid_soft_transition(os, ns); } if (rv < SS_SUCCESS) { if (flags & CS_VERBOSE) print_st_err(mdev, os, ns, rv); return rv; } if (warn_sync_abort) dev_warn(DEV, "%s aborted.\n", warn_sync_abort); print_state_change(mdev, os, ns, flags); /* solve the race between becoming unconfigured, * worker doing the cleanup, and * admin reconfiguring us: * on (re)configure, first set CONFIG_PENDING, * then wait for a potentially exiting worker, * start the worker, and schedule one no_op. * then proceed with configuration. */ if (ns.disk == D_DISKLESS && ns.conn == C_STANDALONE && ns.role == R_SECONDARY && !test_and_set_bit(CONFIG_PENDING, &mdev->flags)) set_bit(DEVICE_DYING, &mdev->flags); /* 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 = ns; if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING) drbd_print_uuids(mdev, "attached to UUIDs"); wake_up(&mdev->misc_wait); wake_up(&mdev->state_wait); wake_up(&mdev->tconn->ping_wait); /* aborted verify run. log the last position */ 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); 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); 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_TEAR_DOWN && 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); 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->data.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 1; } 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) { enum drbd_fencing_p fp; enum drbd_req_event what = NOTHING; union drbd_state nsm = (union drbd_state){ .i = -1 }; 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); } fp = FP_DONT_CARE; if (get_ldev(mdev)) { fp = mdev->ldev->dc.fencing; put_ldev(mdev); } /* Inform userspace about the change... */ drbd_bcast_state(mdev, ns); 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 */ nsm.i = -1; if (ns.susp_nod) { if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) what = RESEND; if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING) what = RESTART_FROZEN_DISK_IO; if (what != NOTHING) nsm.susp_nod = 0; } if (ns.susp_fen) { /* case1: The outdate peer handler is successful: */ if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) { tl_clear(mdev); if (test_bit(NEW_CUR_UUID, &mdev->flags)) { drbd_uuid_new_current(mdev); clear_bit(NEW_CUR_UUID, &mdev->flags); } spin_lock_irq(&mdev->tconn->req_lock); _drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL); spin_unlock_irq(&mdev->tconn->req_lock); } /* case2: The connection was established again: */ if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) { clear_bit(NEW_CUR_UUID, &mdev->flags); what = RESEND; nsm.susp_fen = 0; } } if (what != NOTHING) { spin_lock_irq(&mdev->tconn->req_lock); _tl_restart(mdev, what); nsm.i &= mdev->state.i; _drbd_set_state(mdev, nsm, CS_VERBOSE, NULL); spin_unlock_irq(&mdev->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) { /* attach on the peer */ drbd_send_uuids(mdev); drbd_send_state(mdev); } /* 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 (is_susp(mdev->state)) { 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 (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) { 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); } /* 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); /* 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); if (os.conn != C_AHEAD && ns.conn == C_AHEAD) drbd_send_state(mdev); /* 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; int was_io_error; /* corresponding get_ldev was in __drbd_set_state, to serialize * our cleanup here with the transition to D_DISKLESS, * so it is safe to dreference ldev here. */ eh = mdev->ldev->dc.on_io_error; was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags); /* 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 (drbd_send_state(mdev)) dev_warn(DEV, "Notified peer that I am detaching my disk\n"); else dev_err(DEV, "Sending state for detaching disk failed\n"); 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); if (was_io_error && eh == EP_CALL_HELPER) drbd_khelper(mdev, "local-io-error"); } /* 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)); mdev->rs_total = 0; mdev->rs_failed = 0; atomic_set(&mdev->rs_pending_cnt, 0); if (drbd_send_state(mdev)) dev_warn(DEV, "Notified peer that I'm now diskless.\n"); /* 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) drbd_send_state(mdev); /* 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); /* 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, NULL, "write from resync_finished", BM_LOCKED_SET_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); } after_all_state_ch(mdev->tconn, ns); drbd_md_sync(mdev); } struct after_conn_state_chg_work { struct drbd_work w; enum drbd_conns oc; union drbd_state nms; /* new, max state, over all mdevs */ enum chg_state_flags flags; }; static void after_all_state_ch(struct drbd_tconn *tconn, union drbd_state ns) { if (ns.disk == D_DISKLESS && ns.conn == C_STANDALONE && ns.role == R_SECONDARY) { /* if (test_bit(DEVICE_DYING, &mdev->flags)) TODO: DEVICE_DYING functionality */ drbd_thread_stop_nowait(&tconn->worker); } } 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 nms = acscw->nms; kfree(acscw); /* Upon network configuration, we need to start the receiver */ if (oc == C_STANDALONE && nms.conn == C_UNCONNECTED) drbd_thread_start(&tconn->receiver); //conn_err(tconn, STATE_FMT, STATE_ARGS("nms", nms)); after_all_state_ch(tconn, nms); return 1; } static void print_conn_state_change(struct drbd_tconn *tconn, enum drbd_conns oc, enum drbd_conns nc) { char *pbp, pb[300]; pbp = pb; *pbp = 0; if (nc != oc) pbp += sprintf(pbp, "conn( %s -> %s ) ", drbd_conn_str(oc), drbd_conn_str(nc)); conn_info(tconn, "%s\n", pb); } struct _is_valid_itr_params { enum chg_state_flags flags; union drbd_state mask, val; union drbd_state ms; /* maximal state, over all mdevs */ enum drbd_conns oc; enum { OC_UNINITIALIZED, OC_CONSISTENT, OC_INCONSISTENT, } oc_state; }; static int _is_valid_itr_fn(int vnr, void *p, void *data) { struct drbd_conf *mdev = (struct drbd_conf *)p; struct _is_valid_itr_params *params = (struct _is_valid_itr_params *)data; enum chg_state_flags flags = params->flags; union drbd_state ns, os; enum drbd_state_rv rv; os = mdev->state; ns = apply_mask_val(os, params->mask, params->val); ns = sanitize_state(mdev, ns, NULL); 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); } else rv = is_valid_soft_transition(os, ns); switch (params->oc_state) { case OC_UNINITIALIZED: params->oc = os.conn; params->oc_state = OC_CONSISTENT; break; case OC_CONSISTENT: if (params->oc != os.conn) params->oc_state = OC_INCONSISTENT; break; case OC_INCONSISTENT: break; } if (rv < SS_SUCCESS) { if (flags & CS_VERBOSE) print_st_err(mdev, os, ns, rv); return rv; } else return 0; } static int _set_state_itr_fn(int vnr, void *p, void *data) { struct drbd_conf *mdev = (struct drbd_conf *)p; struct _is_valid_itr_params *params = (struct _is_valid_itr_params *)data; enum chg_state_flags flags = params->flags; union drbd_state os, ns, ms = params->ms; enum drbd_state_rv rv; os = mdev->state; ns = apply_mask_val(os, params->mask, params->val); ns = sanitize_state(mdev, ns, NULL); 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.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; return 0; } 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 _is_valid_itr_params params; struct after_conn_state_chg_work *acscw; enum drbd_conns oc = tconn->cstate; rv = is_valid_conn_transition(oc, val.conn); if (rv < SS_SUCCESS) goto abort; params.flags = flags; params.mask = mask; params.val = val; params.oc_state = OC_UNINITIALIZED; if (!(flags & CS_HARD)) rv = idr_for_each(&tconn->volumes, _is_valid_itr_fn, ¶ms); if (rv == 0) /* idr_for_each semantics */ rv = SS_SUCCESS; if (rv < SS_SUCCESS) goto abort; if (params.oc_state == OC_CONSISTENT) { oc = params.oc; print_conn_state_change(tconn, oc, val.conn); params.flags |= CS_NO_CSTATE_CHG; } tconn->cstate = val.conn; params.ms.i = 0; params.ms.conn = val.conn; idr_for_each(&tconn->volumes, _set_state_itr_fn, ¶ms); acscw = kmalloc(sizeof(*acscw), GFP_ATOMIC); if (acscw) { acscw->oc = oc; acscw->nms = params.ms; acscw->flags = flags; acscw->w.cb = w_after_conn_state_ch; acscw->w.tconn = tconn; drbd_queue_work(&tconn->data.work, &acscw->w); } else { conn_err(tconn, "Could not kmalloc an acscw\n"); } abort: 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; }