| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| 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. |
| |
| */ |
| |
| #include <linux/drbd_limits.h> |
| #include "drbd_int.h" |
| #include "drbd_protocol.h" |
| #include "drbd_req.h" |
| #include "drbd_state_change.h" |
| |
| struct after_state_chg_work { |
| struct drbd_work w; |
| struct drbd_device *device; |
| union drbd_state os; |
| union drbd_state ns; |
| enum chg_state_flags flags; |
| struct completion *done; |
| struct drbd_state_change *state_change; |
| }; |
| |
| enum sanitize_state_warnings { |
| NO_WARNING, |
| ABORTED_ONLINE_VERIFY, |
| ABORTED_RESYNC, |
| CONNECTION_LOST_NEGOTIATING, |
| IMPLICITLY_UPGRADED_DISK, |
| IMPLICITLY_UPGRADED_PDSK, |
| }; |
| |
| static void count_objects(struct drbd_resource *resource, |
| unsigned int *n_devices, |
| unsigned int *n_connections) |
| { |
| struct drbd_device *device; |
| struct drbd_connection *connection; |
| int vnr; |
| |
| *n_devices = 0; |
| *n_connections = 0; |
| |
| idr_for_each_entry(&resource->devices, device, vnr) |
| (*n_devices)++; |
| for_each_connection(connection, resource) |
| (*n_connections)++; |
| } |
| |
| static struct drbd_state_change *alloc_state_change(unsigned int n_devices, unsigned int n_connections, gfp_t gfp) |
| { |
| struct drbd_state_change *state_change; |
| unsigned int size, n; |
| |
| size = sizeof(struct drbd_state_change) + |
| n_devices * sizeof(struct drbd_device_state_change) + |
| n_connections * sizeof(struct drbd_connection_state_change) + |
| n_devices * n_connections * sizeof(struct drbd_peer_device_state_change); |
| state_change = kmalloc(size, gfp); |
| if (!state_change) |
| return NULL; |
| state_change->n_devices = n_devices; |
| state_change->n_connections = n_connections; |
| state_change->devices = (void *)(state_change + 1); |
| state_change->connections = (void *)&state_change->devices[n_devices]; |
| state_change->peer_devices = (void *)&state_change->connections[n_connections]; |
| state_change->resource->resource = NULL; |
| for (n = 0; n < n_devices; n++) |
| state_change->devices[n].device = NULL; |
| for (n = 0; n < n_connections; n++) |
| state_change->connections[n].connection = NULL; |
| return state_change; |
| } |
| |
| struct drbd_state_change *remember_old_state(struct drbd_resource *resource, gfp_t gfp) |
| { |
| struct drbd_state_change *state_change; |
| struct drbd_device *device; |
| unsigned int n_devices; |
| struct drbd_connection *connection; |
| unsigned int n_connections; |
| int vnr; |
| |
| struct drbd_device_state_change *device_state_change; |
| struct drbd_peer_device_state_change *peer_device_state_change; |
| struct drbd_connection_state_change *connection_state_change; |
| |
| /* Caller holds req_lock spinlock. |
| * No state, no device IDR, no connections lists can change. */ |
| count_objects(resource, &n_devices, &n_connections); |
| state_change = alloc_state_change(n_devices, n_connections, gfp); |
| if (!state_change) |
| return NULL; |
| |
| kref_get(&resource->kref); |
| state_change->resource->resource = resource; |
| state_change->resource->role[OLD] = |
| conn_highest_role(first_connection(resource)); |
| state_change->resource->susp[OLD] = resource->susp; |
| state_change->resource->susp_nod[OLD] = resource->susp_nod; |
| state_change->resource->susp_fen[OLD] = resource->susp_fen; |
| |
| connection_state_change = state_change->connections; |
| for_each_connection(connection, resource) { |
| kref_get(&connection->kref); |
| connection_state_change->connection = connection; |
| connection_state_change->cstate[OLD] = |
| connection->cstate; |
| connection_state_change->peer_role[OLD] = |
| conn_highest_peer(connection); |
| connection_state_change++; |
| } |
| |
| device_state_change = state_change->devices; |
| peer_device_state_change = state_change->peer_devices; |
| idr_for_each_entry(&resource->devices, device, vnr) { |
| kref_get(&device->kref); |
| device_state_change->device = device; |
| device_state_change->disk_state[OLD] = device->state.disk; |
| |
| /* The peer_devices for each device have to be enumerated in |
| the order of the connections. We may not use for_each_peer_device() here. */ |
| for_each_connection(connection, resource) { |
| struct drbd_peer_device *peer_device; |
| |
| peer_device = conn_peer_device(connection, device->vnr); |
| peer_device_state_change->peer_device = peer_device; |
| peer_device_state_change->disk_state[OLD] = |
| device->state.pdsk; |
| peer_device_state_change->repl_state[OLD] = |
| max_t(enum drbd_conns, |
| C_WF_REPORT_PARAMS, device->state.conn); |
| peer_device_state_change->resync_susp_user[OLD] = |
| device->state.user_isp; |
| peer_device_state_change->resync_susp_peer[OLD] = |
| device->state.peer_isp; |
| peer_device_state_change->resync_susp_dependency[OLD] = |
| device->state.aftr_isp; |
| peer_device_state_change++; |
| } |
| device_state_change++; |
| } |
| |
| return state_change; |
| } |
| |
| static void remember_new_state(struct drbd_state_change *state_change) |
| { |
| struct drbd_resource_state_change *resource_state_change; |
| struct drbd_resource *resource; |
| unsigned int n; |
| |
| if (!state_change) |
| return; |
| |
| resource_state_change = &state_change->resource[0]; |
| resource = resource_state_change->resource; |
| |
| resource_state_change->role[NEW] = |
| conn_highest_role(first_connection(resource)); |
| resource_state_change->susp[NEW] = resource->susp; |
| resource_state_change->susp_nod[NEW] = resource->susp_nod; |
| resource_state_change->susp_fen[NEW] = resource->susp_fen; |
| |
| for (n = 0; n < state_change->n_devices; n++) { |
| struct drbd_device_state_change *device_state_change = |
| &state_change->devices[n]; |
| struct drbd_device *device = device_state_change->device; |
| |
| device_state_change->disk_state[NEW] = device->state.disk; |
| } |
| |
| for (n = 0; n < state_change->n_connections; n++) { |
| struct drbd_connection_state_change *connection_state_change = |
| &state_change->connections[n]; |
| struct drbd_connection *connection = |
| connection_state_change->connection; |
| |
| connection_state_change->cstate[NEW] = connection->cstate; |
| connection_state_change->peer_role[NEW] = |
| conn_highest_peer(connection); |
| } |
| |
| for (n = 0; n < state_change->n_devices * state_change->n_connections; n++) { |
| struct drbd_peer_device_state_change *peer_device_state_change = |
| &state_change->peer_devices[n]; |
| struct drbd_device *device = |
| peer_device_state_change->peer_device->device; |
| union drbd_dev_state state = device->state; |
| |
| peer_device_state_change->disk_state[NEW] = state.pdsk; |
| peer_device_state_change->repl_state[NEW] = |
| max_t(enum drbd_conns, C_WF_REPORT_PARAMS, state.conn); |
| peer_device_state_change->resync_susp_user[NEW] = |
| state.user_isp; |
| peer_device_state_change->resync_susp_peer[NEW] = |
| state.peer_isp; |
| peer_device_state_change->resync_susp_dependency[NEW] = |
| state.aftr_isp; |
| } |
| } |
| |
| void copy_old_to_new_state_change(struct drbd_state_change *state_change) |
| { |
| struct drbd_resource_state_change *resource_state_change = &state_change->resource[0]; |
| unsigned int n_device, n_connection, n_peer_device, n_peer_devices; |
| |
| #define OLD_TO_NEW(x) \ |
| (x[NEW] = x[OLD]) |
| |
| OLD_TO_NEW(resource_state_change->role); |
| OLD_TO_NEW(resource_state_change->susp); |
| OLD_TO_NEW(resource_state_change->susp_nod); |
| OLD_TO_NEW(resource_state_change->susp_fen); |
| |
| for (n_connection = 0; n_connection < state_change->n_connections; n_connection++) { |
| struct drbd_connection_state_change *connection_state_change = |
| &state_change->connections[n_connection]; |
| |
| OLD_TO_NEW(connection_state_change->peer_role); |
| OLD_TO_NEW(connection_state_change->cstate); |
| } |
| |
| for (n_device = 0; n_device < state_change->n_devices; n_device++) { |
| struct drbd_device_state_change *device_state_change = |
| &state_change->devices[n_device]; |
| |
| OLD_TO_NEW(device_state_change->disk_state); |
| } |
| |
| n_peer_devices = state_change->n_devices * state_change->n_connections; |
| for (n_peer_device = 0; n_peer_device < n_peer_devices; n_peer_device++) { |
| struct drbd_peer_device_state_change *p = |
| &state_change->peer_devices[n_peer_device]; |
| |
| OLD_TO_NEW(p->disk_state); |
| OLD_TO_NEW(p->repl_state); |
| OLD_TO_NEW(p->resync_susp_user); |
| OLD_TO_NEW(p->resync_susp_peer); |
| OLD_TO_NEW(p->resync_susp_dependency); |
| } |
| |
| #undef OLD_TO_NEW |
| } |
| |
| void forget_state_change(struct drbd_state_change *state_change) |
| { |
| unsigned int n; |
| |
| if (!state_change) |
| return; |
| |
| if (state_change->resource->resource) |
| kref_put(&state_change->resource->resource->kref, drbd_destroy_resource); |
| for (n = 0; n < state_change->n_devices; n++) { |
| struct drbd_device *device = state_change->devices[n].device; |
| |
| if (device) |
| kref_put(&device->kref, drbd_destroy_device); |
| } |
| for (n = 0; n < state_change->n_connections; n++) { |
| struct drbd_connection *connection = |
| state_change->connections[n].connection; |
| |
| if (connection) |
| kref_put(&connection->kref, drbd_destroy_connection); |
| } |
| kfree(state_change); |
| } |
| |
| static int w_after_state_ch(struct drbd_work *w, int unused); |
| static void after_state_ch(struct drbd_device *device, union drbd_state os, |
| union drbd_state ns, enum chg_state_flags flags, |
| struct drbd_state_change *); |
| static enum drbd_state_rv is_valid_state(struct drbd_device *, union drbd_state); |
| static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state, struct drbd_connection *); |
| static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns); |
| static union drbd_state sanitize_state(struct drbd_device *device, union drbd_state os, |
| 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_connection *connection) |
| { |
| struct drbd_peer_device *peer_device; |
| bool rv = true; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| if (device->state.disk != D_DISKLESS || |
| device->state.conn != C_STANDALONE || |
| device->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_connection *connection) |
| { |
| enum drbd_role role = R_SECONDARY; |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| role = max_role(role, device->state.role); |
| } |
| rcu_read_unlock(); |
| |
| return role; |
| } |
| |
| enum drbd_role conn_highest_peer(struct drbd_connection *connection) |
| { |
| enum drbd_role peer = R_UNKNOWN; |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| peer = max_role(peer, device->state.peer); |
| } |
| rcu_read_unlock(); |
| |
| return peer; |
| } |
| |
| enum drbd_disk_state conn_highest_disk(struct drbd_connection *connection) |
| { |
| enum drbd_disk_state disk_state = D_DISKLESS; |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| disk_state = max_t(enum drbd_disk_state, disk_state, device->state.disk); |
| } |
| rcu_read_unlock(); |
| |
| return disk_state; |
| } |
| |
| enum drbd_disk_state conn_lowest_disk(struct drbd_connection *connection) |
| { |
| enum drbd_disk_state disk_state = D_MASK; |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| disk_state = min_t(enum drbd_disk_state, disk_state, device->state.disk); |
| } |
| rcu_read_unlock(); |
| |
| return disk_state; |
| } |
| |
| enum drbd_disk_state conn_highest_pdsk(struct drbd_connection *connection) |
| { |
| enum drbd_disk_state disk_state = D_DISKLESS; |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| disk_state = max_t(enum drbd_disk_state, disk_state, device->state.pdsk); |
| } |
| rcu_read_unlock(); |
| |
| return disk_state; |
| } |
| |
| enum drbd_conns conn_lowest_conn(struct drbd_connection *connection) |
| { |
| enum drbd_conns conn = C_MASK; |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| conn = min_t(enum drbd_conns, conn, device->state.conn); |
| } |
| rcu_read_unlock(); |
| |
| return conn; |
| } |
| |
| static bool no_peer_wf_report_params(struct drbd_connection *connection) |
| { |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| bool rv = true; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
| if (peer_device->device->state.conn == C_WF_REPORT_PARAMS) { |
| rv = false; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| return rv; |
| } |
| |
| static void wake_up_all_devices(struct drbd_connection *connection) |
| { |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
| wake_up(&peer_device->device->state_wait); |
| rcu_read_unlock(); |
| |
| } |
| |
| |
| /** |
| * cl_wide_st_chg() - true if the state change is a cluster wide one |
| * @device: DRBD device. |
| * @os: old (current) state. |
| * @ns: new (wanted) state. |
| */ |
| static int cl_wide_st_chg(struct drbd_device *device, |
| 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_device *device, 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(&device->resource->req_lock, flags); |
| ns = apply_mask_val(drbd_read_state(device), mask, val); |
| rv = _drbd_set_state(device, ns, f, NULL); |
| spin_unlock_irqrestore(&device->resource->req_lock, flags); |
| |
| return rv; |
| } |
| |
| /** |
| * drbd_force_state() - Impose a change which happens outside our control on our state |
| * @device: DRBD device. |
| * @mask: mask of state bits to change. |
| * @val: value of new state bits. |
| */ |
| void drbd_force_state(struct drbd_device *device, |
| union drbd_state mask, union drbd_state val) |
| { |
| drbd_change_state(device, CS_HARD, mask, val); |
| } |
| |
| static enum drbd_state_rv |
| _req_st_cond(struct drbd_device *device, 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, &device->flags)) |
| return SS_CW_SUCCESS; |
| |
| if (test_and_clear_bit(CL_ST_CHG_FAIL, &device->flags)) |
| return SS_CW_FAILED_BY_PEER; |
| |
| spin_lock_irqsave(&device->resource->req_lock, flags); |
| os = drbd_read_state(device); |
| ns = sanitize_state(device, os, 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(device, os, ns)) |
| rv = SS_CW_NO_NEED; |
| if (rv == SS_UNKNOWN_ERROR) { |
| rv = is_valid_state(device, ns); |
| if (rv >= SS_SUCCESS) { |
| rv = is_valid_soft_transition(os, ns, first_peer_device(device)->connection); |
| if (rv >= SS_SUCCESS) |
| rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */ |
| } |
| } |
| spin_unlock_irqrestore(&device->resource->req_lock, flags); |
| |
| return rv; |
| } |
| |
| /** |
| * drbd_req_state() - Perform an eventually cluster wide state change |
| * @device: 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_device *device, 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; |
| void *buffer = NULL; |
| |
| init_completion(&done); |
| |
| if (f & CS_SERIALIZE) |
| mutex_lock(device->state_mutex); |
| if (f & CS_INHIBIT_MD_IO) |
| buffer = drbd_md_get_buffer(device, __func__); |
| |
| spin_lock_irqsave(&device->resource->req_lock, flags); |
| os = drbd_read_state(device); |
| ns = sanitize_state(device, os, apply_mask_val(os, mask, val), NULL); |
| rv = is_valid_transition(os, ns); |
| if (rv < SS_SUCCESS) { |
| spin_unlock_irqrestore(&device->resource->req_lock, flags); |
| goto abort; |
| } |
| |
| if (cl_wide_st_chg(device, os, ns)) { |
| rv = is_valid_state(device, ns); |
| if (rv == SS_SUCCESS) |
| rv = is_valid_soft_transition(os, ns, first_peer_device(device)->connection); |
| spin_unlock_irqrestore(&device->resource->req_lock, flags); |
| |
| if (rv < SS_SUCCESS) { |
| if (f & CS_VERBOSE) |
| print_st_err(device, os, ns, rv); |
| goto abort; |
| } |
| |
| if (drbd_send_state_req(first_peer_device(device), mask, val)) { |
| rv = SS_CW_FAILED_BY_PEER; |
| if (f & CS_VERBOSE) |
| print_st_err(device, os, ns, rv); |
| goto abort; |
| } |
| |
| wait_event(device->state_wait, |
| (rv = _req_st_cond(device, mask, val))); |
| |
| if (rv < SS_SUCCESS) { |
| if (f & CS_VERBOSE) |
| print_st_err(device, os, ns, rv); |
| goto abort; |
| } |
| spin_lock_irqsave(&device->resource->req_lock, flags); |
| ns = apply_mask_val(drbd_read_state(device), mask, val); |
| rv = _drbd_set_state(device, ns, f, &done); |
| } else { |
| rv = _drbd_set_state(device, ns, f, &done); |
| } |
| |
| spin_unlock_irqrestore(&device->resource->req_lock, flags); |
| |
| if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) { |
| D_ASSERT(device, current != first_peer_device(device)->connection->worker.task); |
| wait_for_completion(&done); |
| } |
| |
| abort: |
| if (buffer) |
| drbd_md_put_buffer(device); |
| if (f & CS_SERIALIZE) |
| mutex_unlock(device->state_mutex); |
| |
| return rv; |
| } |
| |
| /** |
| * _drbd_request_state() - Request a state change (with flags) |
| * @device: 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_device *device, union drbd_state mask, |
| union drbd_state val, enum chg_state_flags f) |
| { |
| enum drbd_state_rv rv; |
| |
| wait_event(device->state_wait, |
| (rv = drbd_req_state(device, mask, val, f)) != SS_IN_TRANSIENT_STATE); |
| |
| return rv; |
| } |
| |
| /* |
| * We grab drbd_md_get_buffer(), because we don't want to "fail" the disk while |
| * there is IO in-flight: the transition into D_FAILED for detach purposes |
| * may get misinterpreted as actual IO error in a confused endio function. |
| * |
| * We wrap it all into wait_event(), to retry in case the drbd_req_state() |
| * returns SS_IN_TRANSIENT_STATE. |
| * |
| * To avoid potential deadlock with e.g. the receiver thread trying to grab |
| * drbd_md_get_buffer() while trying to get out of the "transient state", we |
| * need to grab and release the meta data buffer inside of that wait_event loop. |
| */ |
| static enum drbd_state_rv |
| request_detach(struct drbd_device *device) |
| { |
| return drbd_req_state(device, NS(disk, D_FAILED), |
| CS_VERBOSE | CS_ORDERED | CS_INHIBIT_MD_IO); |
| } |
| |
| int drbd_request_detach_interruptible(struct drbd_device *device) |
| { |
| int ret, rv; |
| |
| drbd_suspend_io(device); /* so no-one is stuck in drbd_al_begin_io */ |
| wait_event_interruptible(device->state_wait, |
| (rv = request_detach(device)) != SS_IN_TRANSIENT_STATE); |
| drbd_resume_io(device); |
| |
| ret = wait_event_interruptible(device->misc_wait, |
| device->state.disk != D_FAILED); |
| |
| if (rv == SS_IS_DISKLESS) |
| rv = SS_NOTHING_TO_DO; |
| if (ret) |
| rv = ERR_INTR; |
| |
| return rv; |
| } |
| |
| enum drbd_state_rv |
| _drbd_request_state_holding_state_mutex(struct drbd_device *device, union drbd_state mask, |
| union drbd_state val, enum chg_state_flags f) |
| { |
| enum drbd_state_rv rv; |
| |
| BUG_ON(f & CS_SERIALIZE); |
| |
| wait_event_cmd(device->state_wait, |
| (rv = drbd_req_state(device, mask, val, f)) != SS_IN_TRANSIENT_STATE, |
| mutex_unlock(device->state_mutex), |
| mutex_lock(device->state_mutex)); |
| |
| return rv; |
| } |
| |
| static void print_st(struct drbd_device *device, const char *name, union drbd_state ns) |
| { |
| drbd_err(device, " %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_device *device, union drbd_state os, |
| union drbd_state ns, enum drbd_state_rv err) |
| { |
| if (err == SS_IN_TRANSIENT_STATE) |
| return; |
| drbd_err(device, "State change failed: %s\n", drbd_set_st_err_str(err)); |
| print_st(device, " state", os); |
| print_st(device, "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_device *device, 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) |
| drbd_info(device, "%s\n", pb); |
| } |
| |
| static void conn_pr_state_change(struct drbd_connection *connection, 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) |
| drbd_info(connection, "%s\n", pb); |
| } |
| |
| |
| /** |
| * is_valid_state() - Returns an SS_ error code if ns is not valid |
| * @device: DRBD device. |
| * @ns: State to consider. |
| */ |
| static enum drbd_state_rv |
| is_valid_state(struct drbd_device *device, 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(device)) { |
| fp = rcu_dereference(device->ldev->disk_conf)->fencing; |
| put_ldev(device); |
| } |
| |
| nc = rcu_dereference(first_peer_device(device)->connection->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(first_peer_device(device)->connection) == R_PRIMARY) |
| rv = SS_O_VOL_PEER_PRI; |
| } |
| } |
| |
| if (rv <= 0) |
| goto out; /* already found a reason to abort */ |
| else if (ns.role == R_SECONDARY && device->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) && |
| first_peer_device(device)->connection->agreed_pro_version < 88) |
| rv = SS_NOT_SUPPORTED; |
| |
| else if (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) |
| rv = SS_NO_UP_TO_DATE_DISK; |
| |
| else if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) && |
| ns.pdsk == D_UNKNOWN) |
| rv = SS_NEED_CONNECTION; |
| |
| else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN) |
| rv = SS_CONNECTED_OUTDATES; |
| |
| out: |
| 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). |
| * @os: old state. |
| * @ns: new state. |
| * @connection: DRBD connection. |
| */ |
| static enum drbd_state_rv |
| is_valid_soft_transition(union drbd_state os, union drbd_state ns, struct drbd_connection *connection) |
| { |
| 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; |
| |
| /* While establishing a connection only allow cstate to change. |
| Delay/refuse role changes, detach attach etc... (they do not touch cstate) */ |
| if (test_bit(STATE_SENT, &connection->flags) && |
| !((ns.conn == C_WF_REPORT_PARAMS && os.conn == C_WF_CONNECTION) || |
| (ns.conn >= C_CONNECTED && os.conn == C_WF_REPORT_PARAMS))) |
| rv = SS_IN_TRANSIENT_STATE; |
| |
| /* Do not promote during resync handshake triggered by "force primary". |
| * This is a hack. It should really be rejected by the peer during the |
| * cluster wide state change request. */ |
| if (os.role != R_PRIMARY && ns.role == R_PRIMARY |
| && ns.pdsk == D_UP_TO_DATE |
| && ns.disk != D_UP_TO_DATE && ns.disk != D_DISKLESS |
| && (ns.conn <= C_WF_SYNC_UUID || ns.conn != os.conn)) |
| 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... */ |
| |
| if (ns.conn == C_DISCONNECTING && ns.pdsk == D_OUTDATED && |
| os.conn < C_CONNECTED && os.pdsk > D_OUTDATED) |
| rv = SS_OUTDATE_WO_CONN; |
| |
| 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_device *device, 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) |
| drbd_warn(device, "%s\n", msg_table[warn]); |
| } |
| |
| /** |
| * sanitize_state() - Resolves implicitly necessary additional changes to a state transition |
| * @device: DRBD device. |
| * @os: old state. |
| * @ns: new state. |
| * @warn: placeholder for returned state warning. |
| * |
| * 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_device *device, union drbd_state os, |
| 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(device)) { |
| rcu_read_lock(); |
| fp = rcu_dereference(device->ldev->disk_conf)->fencing; |
| rcu_read_unlock(); |
| put_ldev(device); |
| } |
| |
| /* 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(device, D_NEGOTIATING)) { |
| if (device->ed_uuid == device->ldev->md.uuid[UI_CURRENT]) { |
| ns.disk = device->new_state_tmp.disk; |
| ns.pdsk = device->new_state_tmp.pdsk; |
| } else { |
| if (warn) |
| *warn = CONNECTION_LOST_NEGOTIATING; |
| ns.disk = D_DISKLESS; |
| ns.pdsk = D_UNKNOWN; |
| } |
| put_ldev(device); |
| } |
| |
| /* 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 state 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) && |
| !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED)) |
| ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */ |
| |
| if (device->resource->res_opts.on_no_data == OND_SUSPEND_IO && |
| (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) && |
| !(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.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_device *device) |
| { |
| if (test_and_clear_bit(AL_SUSPENDED, &device->flags)) |
| drbd_info(device, "Resumed AL updates\n"); |
| } |
| |
| /* helper for _drbd_set_state */ |
| static void set_ov_position(struct drbd_peer_device *peer_device, enum drbd_conns cs) |
| { |
| struct drbd_device *device = peer_device->device; |
| |
| if (peer_device->connection->agreed_pro_version < 90) |
| device->ov_start_sector = 0; |
| device->rs_total = drbd_bm_bits(device); |
| device->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 */ |
| device->ov_start_sector = ~(sector_t)0; |
| } else { |
| unsigned long bit = BM_SECT_TO_BIT(device->ov_start_sector); |
| if (bit >= device->rs_total) { |
| device->ov_start_sector = |
| BM_BIT_TO_SECT(device->rs_total - 1); |
| device->rs_total = 1; |
| } else |
| device->rs_total -= bit; |
| device->ov_position = device->ov_start_sector; |
| } |
| device->ov_left = device->rs_total; |
| } |
| |
| /** |
| * _drbd_set_state() - Set a new DRBD state |
| * @device: 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. Do not call directly. |
| */ |
| enum drbd_state_rv |
| _drbd_set_state(struct drbd_device *device, union drbd_state ns, |
| enum chg_state_flags flags, struct completion *done) |
| { |
| struct drbd_peer_device *peer_device = first_peer_device(device); |
| struct drbd_connection *connection = peer_device ? peer_device->connection : NULL; |
| union drbd_state os; |
| enum drbd_state_rv rv = SS_SUCCESS; |
| enum sanitize_state_warnings ssw; |
| struct after_state_chg_work *ascw; |
| struct drbd_state_change *state_change; |
| |
| os = drbd_read_state(device); |
| |
| ns = sanitize_state(device, os, 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(device, ns); |
| if (rv < SS_SUCCESS) { |
| /* If the old state was illegal as well, then let |
| this happen...*/ |
| |
| if (is_valid_state(device, os) == rv) |
| rv = is_valid_soft_transition(os, ns, connection); |
| } else |
| rv = is_valid_soft_transition(os, ns, connection); |
| } |
| |
| if (rv < SS_SUCCESS) { |
| if (flags & CS_VERBOSE) |
| print_st_err(device, os, ns, rv); |
| return rv; |
| } |
| |
| print_sanitize_warnings(device, ssw); |
| |
| drbd_pr_state_change(device, 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(connection, 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(&device->local_cnt); |
| |
| if (!is_sync_state(os.conn) && is_sync_state(ns.conn)) |
| clear_bit(RS_DONE, &device->flags); |
| |
| /* FIXME: Have any flags been set earlier in this function already? */ |
| state_change = remember_old_state(device->resource, GFP_ATOMIC); |
| |
| /* changes to local_cnt and device flags should be visible before |
| * changes to state, which again should be visible before anything else |
| * depending on that change happens. */ |
| smp_wmb(); |
| device->state.i = ns.i; |
| device->resource->susp = ns.susp; |
| device->resource->susp_nod = ns.susp_nod; |
| device->resource->susp_fen = ns.susp_fen; |
| smp_wmb(); |
| |
| remember_new_state(state_change); |
| |
| /* put replicated vs not-replicated requests in seperate epochs */ |
| if (drbd_should_do_remote((union drbd_dev_state)os.i) != |
| drbd_should_do_remote((union drbd_dev_state)ns.i)) |
| start_new_tl_epoch(connection); |
| |
| if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING) |
| drbd_print_uuids(device, "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(connection)) { |
| clear_bit(STATE_SENT, &connection->flags); |
| wake_up_all_devices(connection); |
| } |
| |
| wake_up(&device->misc_wait); |
| wake_up(&device->state_wait); |
| wake_up(&connection->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) { |
| device->ov_start_sector = |
| BM_BIT_TO_SECT(drbd_bm_bits(device) - device->ov_left); |
| if (device->ov_left) |
| drbd_info(device, "Online Verify reached sector %llu\n", |
| (unsigned long long)device->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)) { |
| drbd_info(device, "Syncer continues.\n"); |
| device->rs_paused += (long)jiffies |
| -(long)device->rs_mark_time[device->rs_last_mark]; |
| if (ns.conn == C_SYNC_TARGET) |
| mod_timer(&device->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)) { |
| drbd_info(device, "Resync suspended\n"); |
| device->rs_mark_time[device->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(peer_device, ns.conn); |
| device->rs_start = now; |
| device->rs_last_sect_ev = 0; |
| device->ov_last_oos_size = 0; |
| device->ov_last_oos_start = 0; |
| |
| for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
| device->rs_mark_left[i] = device->ov_left; |
| device->rs_mark_time[i] = now; |
| } |
| |
| drbd_rs_controller_reset(peer_device); |
| |
| if (ns.conn == C_VERIFY_S) { |
| drbd_info(device, "Starting Online Verify from sector %llu\n", |
| (unsigned long long)device->ov_position); |
| mod_timer(&device->resync_timer, jiffies); |
| } |
| } |
| |
| if (get_ldev(device)) { |
| u32 mdf = device->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, &device->flags)) |
| mdf |= MDF_CRASHED_PRIMARY; |
| if (device->state.role == R_PRIMARY || |
| (device->state.pdsk < D_INCONSISTENT && device->state.peer == R_PRIMARY)) |
| mdf |= MDF_PRIMARY_IND; |
| if (device->state.conn > C_WF_REPORT_PARAMS) |
| mdf |= MDF_CONNECTED_IND; |
| if (device->state.disk > D_INCONSISTENT) |
| mdf |= MDF_CONSISTENT; |
| if (device->state.disk > D_OUTDATED) |
| mdf |= MDF_WAS_UP_TO_DATE; |
| if (device->state.pdsk <= D_OUTDATED && device->state.pdsk >= D_INCONSISTENT) |
| mdf |= MDF_PEER_OUT_DATED; |
| if (mdf != device->ldev->md.flags) { |
| device->ldev->md.flags = mdf; |
| drbd_md_mark_dirty(device); |
| } |
| if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT) |
| drbd_set_ed_uuid(device, device->ldev->md.uuid[UI_CURRENT]); |
| put_ldev(device); |
| } |
| |
| /* 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, &device->flags); |
| |
| /* Receiver should clean up itself */ |
| if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING) |
| drbd_thread_stop_nowait(&connection->receiver); |
| |
| /* Now the receiver finished cleaning up itself, it should die */ |
| if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE) |
| drbd_thread_stop_nowait(&connection->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(&connection->receiver); |
| |
| /* Resume AL writing if we get a connection */ |
| if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) { |
| drbd_resume_al(device); |
| connection->connect_cnt++; |
| } |
| |
| /* 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) |
| device->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->device = device; |
| ascw->done = done; |
| ascw->state_change = state_change; |
| drbd_queue_work(&connection->sender_work, |
| &ascw->w); |
| } else { |
| drbd_err(device, "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_device *device = ascw->device; |
| |
| after_state_ch(device, ascw->os, ascw->ns, ascw->flags, ascw->state_change); |
| forget_state_change(ascw->state_change); |
| if (ascw->flags & CS_WAIT_COMPLETE) |
| complete(ascw->done); |
| kfree(ascw); |
| |
| return 0; |
| } |
| |
| static void abw_start_sync(struct drbd_device *device, int rv) |
| { |
| if (rv) { |
| drbd_err(device, "Writing the bitmap failed not starting resync.\n"); |
| _drbd_request_state(device, NS(conn, C_CONNECTED), CS_VERBOSE); |
| return; |
| } |
| |
| switch (device->state.conn) { |
| case C_STARTING_SYNC_T: |
| _drbd_request_state(device, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE); |
| break; |
| case C_STARTING_SYNC_S: |
| drbd_start_resync(device, C_SYNC_SOURCE); |
| break; |
| } |
| } |
| |
| int drbd_bitmap_io_from_worker(struct drbd_device *device, |
| int (*io_fn)(struct drbd_device *, struct drbd_peer_device *), |
| char *why, enum bm_flag flags, |
| struct drbd_peer_device *peer_device) |
| { |
| int rv; |
| |
| D_ASSERT(device, current == first_peer_device(device)->connection->worker.task); |
| |
| /* open coded non-blocking drbd_suspend_io(device); */ |
| atomic_inc(&device->suspend_cnt); |
| |
| drbd_bm_lock(device, why, flags); |
| rv = io_fn(device, peer_device); |
| drbd_bm_unlock(device); |
| |
| drbd_resume_io(device); |
| |
| return rv; |
| } |
| |
| int notify_resource_state_change(struct sk_buff *skb, |
| unsigned int seq, |
| void *state_change, |
| enum drbd_notification_type type) |
| { |
| struct drbd_resource_state_change *resource_state_change = state_change; |
| struct drbd_resource *resource = resource_state_change->resource; |
| struct resource_info resource_info = { |
| .res_role = resource_state_change->role[NEW], |
| .res_susp = resource_state_change->susp[NEW], |
| .res_susp_nod = resource_state_change->susp_nod[NEW], |
| .res_susp_fen = resource_state_change->susp_fen[NEW], |
| }; |
| |
| return notify_resource_state(skb, seq, resource, &resource_info, type); |
| } |
| |
| int notify_connection_state_change(struct sk_buff *skb, |
| unsigned int seq, |
| void *state_change, |
| enum drbd_notification_type type) |
| { |
| struct drbd_connection_state_change *p = state_change; |
| struct drbd_connection *connection = p->connection; |
| struct connection_info connection_info = { |
| .conn_connection_state = p->cstate[NEW], |
| .conn_role = p->peer_role[NEW], |
| }; |
| |
| return notify_connection_state(skb, seq, connection, &connection_info, type); |
| } |
| |
| int notify_device_state_change(struct sk_buff *skb, |
| unsigned int seq, |
| void *state_change, |
| enum drbd_notification_type type) |
| { |
| struct drbd_device_state_change *device_state_change = state_change; |
| struct drbd_device *device = device_state_change->device; |
| struct device_info device_info = { |
| .dev_disk_state = device_state_change->disk_state[NEW], |
| }; |
| |
| return notify_device_state(skb, seq, device, &device_info, type); |
| } |
| |
| int notify_peer_device_state_change(struct sk_buff *skb, |
| unsigned int seq, |
| void *state_change, |
| enum drbd_notification_type type) |
| { |
| struct drbd_peer_device_state_change *p = state_change; |
| struct drbd_peer_device *peer_device = p->peer_device; |
| struct peer_device_info peer_device_info = { |
| .peer_repl_state = p->repl_state[NEW], |
| .peer_disk_state = p->disk_state[NEW], |
| .peer_resync_susp_user = p->resync_susp_user[NEW], |
| .peer_resync_susp_peer = p->resync_susp_peer[NEW], |
| .peer_resync_susp_dependency = p->resync_susp_dependency[NEW], |
| }; |
| |
| return notify_peer_device_state(skb, seq, peer_device, &peer_device_info, type); |
| } |
| |
| static void broadcast_state_change(struct drbd_state_change *state_change) |
| { |
| struct drbd_resource_state_change *resource_state_change = &state_change->resource[0]; |
| bool resource_state_has_changed; |
| unsigned int n_device, n_connection, n_peer_device, n_peer_devices; |
| int (*last_func)(struct sk_buff *, unsigned int, |
| void *, enum drbd_notification_type) = NULL; |
| void *last_arg = NULL; |
| |
| #define HAS_CHANGED(state) ((state)[OLD] != (state)[NEW]) |
| #define FINAL_STATE_CHANGE(type) \ |
| ({ if (last_func) \ |
| last_func(NULL, 0, last_arg, type); \ |
| }) |
| #define REMEMBER_STATE_CHANGE(func, arg, type) \ |
| ({ FINAL_STATE_CHANGE(type | NOTIFY_CONTINUES); \ |
| last_func = func; \ |
| last_arg = arg; \ |
| }) |
| |
| mutex_lock(¬ification_mutex); |
| |
| resource_state_has_changed = |
| HAS_CHANGED(resource_state_change->role) || |
| HAS_CHANGED(resource_state_change->susp) || |
| HAS_CHANGED(resource_state_change->susp_nod) || |
| HAS_CHANGED(resource_state_change->susp_fen); |
| |
| if (resource_state_has_changed) |
| REMEMBER_STATE_CHANGE(notify_resource_state_change, |
| resource_state_change, NOTIFY_CHANGE); |
| |
| for (n_connection = 0; n_connection < state_change->n_connections; n_connection++) { |
| struct drbd_connection_state_change *connection_state_change = |
| &state_change->connections[n_connection]; |
| |
| if (HAS_CHANGED(connection_state_change->peer_role) || |
| HAS_CHANGED(connection_state_change->cstate)) |
| REMEMBER_STATE_CHANGE(notify_connection_state_change, |
| connection_state_change, NOTIFY_CHANGE); |
| } |
| |
| for (n_device = 0; n_device < state_change->n_devices; n_device++) { |
| struct drbd_device_state_change *device_state_change = |
| &state_change->devices[n_device]; |
| |
| if (HAS_CHANGED(device_state_change->disk_state)) |
| REMEMBER_STATE_CHANGE(notify_device_state_change, |
| device_state_change, NOTIFY_CHANGE); |
| } |
| |
| n_peer_devices = state_change->n_devices * state_change->n_connections; |
| for (n_peer_device = 0; n_peer_device < n_peer_devices; n_peer_device++) { |
| struct drbd_peer_device_state_change *p = |
| &state_change->peer_devices[n_peer_device]; |
| |
| if (HAS_CHANGED(p->disk_state) || |
| HAS_CHANGED(p->repl_state) || |
| HAS_CHANGED(p->resync_susp_user) || |
| HAS_CHANGED(p->resync_susp_peer) || |
| HAS_CHANGED(p->resync_susp_dependency)) |
| REMEMBER_STATE_CHANGE(notify_peer_device_state_change, |
| p, NOTIFY_CHANGE); |
| } |
| |
| FINAL_STATE_CHANGE(NOTIFY_CHANGE); |
| mutex_unlock(¬ification_mutex); |
| |
| #undef HAS_CHANGED |
| #undef FINAL_STATE_CHANGE |
| #undef REMEMBER_STATE_CHANGE |
| } |
| |
| /* takes old and new peer disk state */ |
| static bool lost_contact_to_peer_data(enum drbd_disk_state os, enum drbd_disk_state ns) |
| { |
| if ((os >= D_INCONSISTENT && os != D_UNKNOWN && os != D_OUTDATED) |
| && (ns < D_INCONSISTENT || ns == D_UNKNOWN || ns == D_OUTDATED)) |
| return true; |
| |
| /* Scenario, starting with normal operation |
| * Connected Primary/Secondary UpToDate/UpToDate |
| * NetworkFailure Primary/Unknown UpToDate/DUnknown (frozen) |
| * ... |
| * Connected Primary/Secondary UpToDate/Diskless (resumed; needs to bump uuid!) |
| */ |
| if (os == D_UNKNOWN |
| && (ns == D_DISKLESS || ns == D_FAILED || ns == D_OUTDATED)) |
| return true; |
| |
| return false; |
| } |
| |
| /** |
| * after_state_ch() - Perform after state change actions that may sleep |
| * @device: DRBD device. |
| * @os: old state. |
| * @ns: new state. |
| * @flags: Flags |
| * @state_change: state change to broadcast |
| */ |
| static void after_state_ch(struct drbd_device *device, union drbd_state os, |
| union drbd_state ns, enum chg_state_flags flags, |
| struct drbd_state_change *state_change) |
| { |
| struct drbd_resource *resource = device->resource; |
| struct drbd_peer_device *peer_device = first_peer_device(device); |
| struct drbd_connection *connection = peer_device ? peer_device->connection : NULL; |
| struct sib_info sib; |
| |
| broadcast_state_change(state_change); |
| |
| sib.sib_reason = SIB_STATE_CHANGE; |
| sib.os = os; |
| sib.ns = ns; |
| |
| if ((os.disk != D_UP_TO_DATE || os.pdsk != D_UP_TO_DATE) |
| && (ns.disk == D_UP_TO_DATE && ns.pdsk == D_UP_TO_DATE)) { |
| clear_bit(CRASHED_PRIMARY, &device->flags); |
| if (device->p_uuid) |
| device->p_uuid[UI_FLAGS] &= ~((u64)2); |
| } |
| |
| /* Inform userspace about the change... */ |
| drbd_bcast_event(device, &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(device, "pri-on-incon-degr"); |
| |
| /* Here we have the actions that are performed after a |
| state change. This function might sleep */ |
| |
| if (ns.susp_nod) { |
| enum drbd_req_event what = NOTHING; |
| |
| spin_lock_irq(&device->resource->req_lock); |
| if (os.conn < C_CONNECTED && conn_lowest_conn(connection) >= C_CONNECTED) |
| what = RESEND; |
| |
| if ((os.disk == D_ATTACHING || os.disk == D_NEGOTIATING) && |
| conn_lowest_disk(connection) == D_UP_TO_DATE) |
| what = RESTART_FROZEN_DISK_IO; |
| |
| if (resource->susp_nod && what != NOTHING) { |
| _tl_restart(connection, what); |
| _conn_request_state(connection, |
| (union drbd_state) { { .susp_nod = 1 } }, |
| (union drbd_state) { { .susp_nod = 0 } }, |
| CS_VERBOSE); |
| } |
| spin_unlock_irq(&device->resource->req_lock); |
| } |
| |
| if (ns.susp_fen) { |
| spin_lock_irq(&device->resource->req_lock); |
| if (resource->susp_fen && conn_lowest_conn(connection) >= C_CONNECTED) { |
| /* case2: The connection was established again: */ |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
| clear_bit(NEW_CUR_UUID, &peer_device->device->flags); |
| rcu_read_unlock(); |
| |
| /* We should actively create a new uuid, _before_ |
| * we resume/resent, if the peer is diskless |
| * (recovery from a multiple error scenario). |
| * Currently, this happens with a slight delay |
| * below when checking lost_contact_to_peer_data() ... |
| */ |
| _tl_restart(connection, RESEND); |
| _conn_request_state(connection, |
| (union drbd_state) { { .susp_fen = 1 } }, |
| (union drbd_state) { { .susp_fen = 0 } }, |
| CS_VERBOSE); |
| } |
| spin_unlock_irq(&device->resource->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) && |
| connection->agreed_pro_version >= 96 && get_ldev(device)) { |
| drbd_gen_and_send_sync_uuid(peer_device); |
| put_ldev(device); |
| } |
| |
| /* 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. */ |
| device->rs_total = 0; |
| device->rs_failed = 0; |
| atomic_set(&device->rs_pending_cnt, 0); |
| drbd_rs_cancel_all(device); |
| |
| drbd_send_uuids(peer_device); |
| drbd_send_state(peer_device, 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 && |
| device->state.conn == C_WF_BITMAP_S) |
| drbd_queue_bitmap_io(device, &drbd_send_bitmap, NULL, |
| "send_bitmap (WFBitMapS)", |
| BM_LOCKED_TEST_ALLOWED, peer_device); |
| |
| /* Lost contact to peer's copy of the data */ |
| if (lost_contact_to_peer_data(os.pdsk, ns.pdsk)) { |
| if (get_ldev(device)) { |
| if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) && |
| device->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { |
| if (drbd_suspended(device)) { |
| set_bit(NEW_CUR_UUID, &device->flags); |
| } else { |
| drbd_uuid_new_current(device); |
| drbd_send_uuids(peer_device); |
| } |
| } |
| put_ldev(device); |
| } |
| } |
| |
| if (ns.pdsk < D_INCONSISTENT && get_ldev(device)) { |
| if (os.peer != R_PRIMARY && ns.peer == R_PRIMARY && |
| device->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) { |
| drbd_uuid_new_current(device); |
| drbd_send_uuids(peer_device); |
| } |
| /* 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(device, &drbd_bm_write, |
| "demote diskless peer", BM_LOCKED_SET_ALLOWED, peer_device); |
| put_ldev(device); |
| } |
| |
| /* 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 && |
| device->state.conn <= C_CONNECTED && get_ldev(device)) { |
| /* 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(device, &drbd_bm_write, |
| "demote", BM_LOCKED_TEST_ALLOWED, peer_device); |
| put_ldev(device); |
| } |
| |
| /* Last part of the attaching process ... */ |
| if (ns.conn >= C_CONNECTED && |
| os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) { |
| drbd_send_sizes(peer_device, 0, 0); /* to start sync... */ |
| drbd_send_uuids(peer_device); |
| drbd_send_state(peer_device, 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(peer_device, 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(device); |
| |
| /* 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(peer_device, ns); |
| |
| if (os.conn != C_AHEAD && ns.conn == C_AHEAD) |
| drbd_send_state(peer_device, 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(device, |
| &drbd_bmio_set_n_write, &abw_start_sync, |
| "set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED, |
| peer_device); |
| |
| /* 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 (device->ldev) { |
| rcu_read_lock(); |
| eh = rcu_dereference(device->ldev->disk_conf)->on_io_error; |
| rcu_read_unlock(); |
| |
| was_io_error = test_and_clear_bit(WAS_IO_ERROR, &device->flags); |
| |
| /* Intentionally call this handler first, before drbd_send_state(). |
| * See: 2932204 drbd: call local-io-error handler early |
| * People may chose to hard-reset the box from this handler. |
| * It is useful if this looks like a "regular node crash". */ |
| if (was_io_error && eh == EP_CALL_HELPER) |
| drbd_khelper(device, "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, &device->flags)) |
| tl_abort_disk_io(device); |
| |
| /* 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 (device->state.disk != D_FAILED) |
| drbd_err(device, |
| "ASSERT FAILED: disk is %s during detach\n", |
| drbd_disk_str(device->state.disk)); |
| |
| if (ns.conn >= C_CONNECTED) |
| drbd_send_state(peer_device, ns); |
| |
| drbd_rs_cancel_all(device); |
| |
| /* 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(device); |
| } |
| put_ldev(device); |
| } |
| |
| /* 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 (device->state.disk != D_DISKLESS) |
| drbd_err(device, |
| "ASSERT FAILED: disk is %s while going diskless\n", |
| drbd_disk_str(device->state.disk)); |
| |
| if (ns.conn >= C_CONNECTED) |
| drbd_send_state(peer_device, ns); |
| /* corresponding get_ldev in __drbd_set_state |
| * this may finally trigger drbd_ldev_destroy. */ |
| put_ldev(device); |
| } |
| |
| /* 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(peer_device, ns); |
| |
| /* Disks got bigger while they were detached */ |
| if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING && |
| test_and_clear_bit(RESYNC_AFTER_NEG, &device->flags)) { |
| if (ns.conn == C_CONNECTED) |
| resync_after_online_grow(device); |
| } |
| |
| /* 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(device); |
| |
| /* 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(peer_device, 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(device)) |
| drbd_send_state(peer_device, ns); |
| |
| /* This triggers bitmap writeout of potentially still unwritten pages |
| * if the resync finished cleanly, or aborted because of peer disk |
| * failure, or on transition from resync back to AHEAD/BEHIND. |
| * |
| * Connection loss is handled in drbd_disconnected() by the receiver. |
| * |
| * 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 && os.conn < C_AHEAD) && |
| (ns.conn == C_CONNECTED || ns.conn >= C_AHEAD) && get_ldev(device)) { |
| drbd_queue_bitmap_io(device, &drbd_bm_write_copy_pages, NULL, |
| "write from resync_finished", BM_LOCKED_CHANGE_ALLOWED, |
| peer_device); |
| put_ldev(device); |
| } |
| |
| if (ns.disk == D_DISKLESS && |
| ns.conn == C_STANDALONE && |
| ns.role == R_SECONDARY) { |
| if (os.aftr_isp != ns.aftr_isp) |
| resume_next_sg(device); |
| } |
| |
| drbd_md_sync(device); |
| } |
| |
| 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 devices */ |
| enum chg_state_flags flags; |
| struct drbd_connection *connection; |
| struct drbd_state_change *state_change; |
| }; |
| |
| 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_connection *connection = acscw->connection; |
| enum drbd_conns oc = acscw->oc; |
| union drbd_state ns_max = acscw->ns_max; |
| struct drbd_peer_device *peer_device; |
| int vnr; |
| |
| broadcast_state_change(acscw->state_change); |
| forget_state_change(acscw->state_change); |
| kfree(acscw); |
| |
| /* Upon network configuration, we need to start the receiver */ |
| if (oc == C_STANDALONE && ns_max.conn == C_UNCONNECTED) |
| drbd_thread_start(&connection->receiver); |
| |
| if (oc == C_DISCONNECTING && ns_max.conn == C_STANDALONE) { |
| struct net_conf *old_conf; |
| |
| mutex_lock(¬ification_mutex); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) |
| notify_peer_device_state(NULL, 0, peer_device, NULL, |
| NOTIFY_DESTROY | NOTIFY_CONTINUES); |
| notify_connection_state(NULL, 0, connection, NULL, NOTIFY_DESTROY); |
| mutex_unlock(¬ification_mutex); |
| |
| mutex_lock(&connection->resource->conf_update); |
| old_conf = connection->net_conf; |
| connection->my_addr_len = 0; |
| connection->peer_addr_len = 0; |
| RCU_INIT_POINTER(connection->net_conf, NULL); |
| conn_free_crypto(connection); |
| mutex_unlock(&connection->resource->conf_update); |
| |
| kvfree_rcu_mightsleep(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(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| if (test_bit(NEW_CUR_UUID, &device->flags)) { |
| drbd_uuid_new_current(device); |
| clear_bit(NEW_CUR_UUID, &device->flags); |
| } |
| } |
| rcu_read_unlock(); |
| spin_lock_irq(&connection->resource->req_lock); |
| _tl_restart(connection, CONNECTION_LOST_WHILE_PENDING); |
| _conn_request_state(connection, |
| (union drbd_state) { { .susp_fen = 1 } }, |
| (union drbd_state) { { .susp_fen = 0 } }, |
| CS_VERBOSE); |
| spin_unlock_irq(&connection->resource->req_lock); |
| } |
| } |
| conn_md_sync(connection); |
| kref_put(&connection->kref, drbd_destroy_connection); |
| |
| return 0; |
| } |
| |
| static void conn_old_common_state(struct drbd_connection *connection, union drbd_state *pcs, enum chg_state_flags *pf) |
| { |
| enum chg_state_flags flags = ~0; |
| struct drbd_peer_device *peer_device; |
| int vnr, first_vol = 1; |
| union drbd_dev_state os, cs = { |
| { .role = R_SECONDARY, |
| .peer = R_UNKNOWN, |
| .conn = connection->cstate, |
| .disk = D_DISKLESS, |
| .pdsk = D_UNKNOWN, |
| } }; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| os = device->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_connection *connection, 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_peer_device *peer_device; |
| int vnr; |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| os = drbd_read_state(device); |
| ns = sanitize_state(device, os, 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 && !(flags & CS_HARD)) { |
| rv = is_valid_state(device, ns); |
| if (rv < SS_SUCCESS) { |
| if (is_valid_state(device, os) == rv) |
| rv = is_valid_soft_transition(os, ns, connection); |
| } else |
| rv = is_valid_soft_transition(os, ns, connection); |
| } |
| |
| if (rv < SS_SUCCESS) { |
| if (flags & CS_VERBOSE) |
| print_st_err(device, os, ns, rv); |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| |
| return rv; |
| } |
| |
| static void |
| conn_set_state(struct drbd_connection *connection, 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_peer_device *peer_device; |
| 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 (connection->cstate != C_WF_REPORT_PARAMS && val.conn == C_WF_REPORT_PARAMS) |
| connection->last_reconnect_jif = jiffies; |
| |
| connection->cstate = val.conn; |
| } |
| |
| rcu_read_lock(); |
| idr_for_each_entry(&connection->peer_devices, peer_device, vnr) { |
| struct drbd_device *device = peer_device->device; |
| number_of_volumes++; |
| os = drbd_read_state(device); |
| ns = apply_mask_val(os, mask, val); |
| ns = sanitize_state(device, os, ns, NULL); |
| |
| if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED) |
| ns.disk = os.disk; |
| |
| rv = _drbd_set_state(device, ns, flags, NULL); |
| BUG_ON(rv < SS_SUCCESS); |
| ns.i = device->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 = connection->resource->susp; |
| ns_min.susp_nod = ns_max.susp_nod = connection->resource->susp_nod; |
| ns_min.susp_fen = ns_max.susp_fen = connection->resource->susp_fen; |
| |
| *pns_min = ns_min; |
| *pns_max = ns_max; |
| } |
| |
| static enum drbd_state_rv |
| _conn_rq_cond(struct drbd_connection *connection, union drbd_state mask, union drbd_state val) |
| { |
| enum drbd_state_rv err, rv = SS_UNKNOWN_ERROR; /* continue waiting */; |
| |
| if (test_and_clear_bit(CONN_WD_ST_CHG_OKAY, &connection->flags)) |
| rv = SS_CW_SUCCESS; |
| |
| if (test_and_clear_bit(CONN_WD_ST_CHG_FAIL, &connection->flags)) |
| rv = SS_CW_FAILED_BY_PEER; |
| |
| err = conn_is_valid_transition(connection, mask, val, 0); |
| if (err == SS_SUCCESS && connection->cstate == C_WF_REPORT_PARAMS) |
| return rv; |
| |
| return err; |
| } |
| |
| enum drbd_state_rv |
| _conn_request_state(struct drbd_connection *connection, 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 = connection->cstate; |
| union drbd_state ns_max, ns_min, os; |
| bool have_mutex = false; |
| struct drbd_state_change *state_change; |
| |
| if (mask.conn) { |
| rv = is_valid_conn_transition(oc, val.conn); |
| if (rv < SS_SUCCESS) |
| goto abort; |
| } |
| |
| rv = conn_is_valid_transition(connection, 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(&connection->resource->req_lock); |
| mutex_lock(&connection->cstate_mutex); |
| have_mutex = true; |
| |
| set_bit(CONN_WD_ST_CHG_REQ, &connection->flags); |
| if (conn_send_state_req(connection, mask, val)) { |
| /* sending failed. */ |
| clear_bit(CONN_WD_ST_CHG_REQ, &connection->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, &connection->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(&connection->resource->req_lock); |
| wait_event_lock_irq(connection->ping_wait, |
| (rv = _conn_rq_cond(connection, mask, val)), |
| connection->resource->req_lock); |
| clear_bit(CONN_WD_ST_CHG_REQ, &connection->flags); |
| if (rv < SS_SUCCESS) |
| goto abort; |
| } |
| |
| state_change = remember_old_state(connection->resource, GFP_ATOMIC); |
| conn_old_common_state(connection, &os, &flags); |
| flags |= CS_DC_SUSP; |
| conn_set_state(connection, mask, val, &ns_min, &ns_max, flags); |
| conn_pr_state_change(connection, os, ns_max, flags); |
| remember_new_state(state_change); |
| |
| 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(&connection->kref); |
| acscw->connection = connection; |
| acscw->state_change = state_change; |
| drbd_queue_work(&connection->sender_work, &acscw->w); |
| } else { |
| drbd_err(connection, "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(&connection->resource->req_lock); |
| abort_unlocked: |
| mutex_unlock(&connection->cstate_mutex); |
| spin_lock_irq(&connection->resource->req_lock); |
| } |
| if (rv < SS_SUCCESS && flags & CS_VERBOSE) { |
| drbd_err(connection, "State change failed: %s\n", drbd_set_st_err_str(rv)); |
| drbd_err(connection, " mask = 0x%x val = 0x%x\n", mask.i, val.i); |
| drbd_err(connection, " 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_connection *connection, union drbd_state mask, union drbd_state val, |
| enum chg_state_flags flags) |
| { |
| enum drbd_state_rv rv; |
| |
| spin_lock_irq(&connection->resource->req_lock); |
| rv = _conn_request_state(connection, mask, val, flags); |
| spin_unlock_irq(&connection->resource->req_lock); |
| |
| return rv; |
| } |