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linux-sg2042/drivers/block/drbd/drbd_state.c

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/*
drbd_state.c
This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev
from Logicworks, Inc. for making SDP replication support possible.
drbd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
drbd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with drbd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/drbd_limits.h>
#include "drbd_int.h"
#include "drbd_protocol.h"
#include "drbd_req.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;
};
enum sanitize_state_warnings {
NO_WARNING,
ABORTED_ONLINE_VERIFY,
ABORTED_RESYNC,
CONNECTION_LOST_NEGOTIATING,
IMPLICITLY_UPGRADED_DISK,
IMPLICITLY_UPGRADED_PDSK,
};
static int w_after_state_ch(struct drbd_work *w, int unused);
static void after_state_ch(struct drbd_device *device, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags);
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_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;
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;
init_completion(&done);
if (f & CS_SERIALIZE)
mutex_lock(device->state_mutex);
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 (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;
}
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)
/* 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;
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).
* @device: DRBD device.
* @ns: new state.
* @os: old state.
*/
static enum drbd_state_rv
is_valid_soft_transition(union drbd_state os, union drbd_state ns, struct drbd_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;
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_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_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 stat on the disk states */
disk_min = D_DISKLESS;
disk_max = D_UP_TO_DATE;
pdsk_min = D_INCONSISTENT;
pdsk_max = D_UNKNOWN;
switch ((enum drbd_conns)ns.conn) {
case C_WF_BITMAP_T:
case C_PAUSED_SYNC_T:
case C_STARTING_SYNC_T:
case C_WF_SYNC_UUID:
case C_BEHIND:
disk_min = D_INCONSISTENT;
disk_max = D_OUTDATED;
pdsk_min = D_UP_TO_DATE;
pdsk_max = D_UP_TO_DATE;
break;
case C_VERIFY_S:
case C_VERIFY_T:
disk_min = D_UP_TO_DATE;
disk_max = D_UP_TO_DATE;
pdsk_min = D_UP_TO_DATE;
pdsk_max = D_UP_TO_DATE;
break;
case C_CONNECTED:
disk_min = D_DISKLESS;
disk_max = D_UP_TO_DATE;
pdsk_min = D_DISKLESS;
pdsk_max = D_UP_TO_DATE;
break;
case C_WF_BITMAP_S:
case C_PAUSED_SYNC_S:
case C_STARTING_SYNC_S:
case C_AHEAD:
disk_min = D_UP_TO_DATE;
disk_max = D_UP_TO_DATE;
pdsk_min = D_INCONSISTENT;
pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
break;
case C_SYNC_TARGET:
disk_min = D_INCONSISTENT;
disk_max = D_INCONSISTENT;
pdsk_min = D_UP_TO_DATE;
pdsk_max = D_UP_TO_DATE;
break;
case C_SYNC_SOURCE:
disk_min = D_UP_TO_DATE;
disk_max = D_UP_TO_DATE;
pdsk_min = D_INCONSISTENT;
pdsk_max = D_INCONSISTENT;
break;
case C_STANDALONE:
case C_DISCONNECTING:
case C_UNCONNECTED:
case C_TIMEOUT:
case C_BROKEN_PIPE:
case C_NETWORK_FAILURE:
case C_PROTOCOL_ERROR:
case C_TEAR_DOWN:
case C_WF_CONNECTION:
case C_WF_REPORT_PARAMS:
case C_MASK:
break;
}
if (ns.disk > disk_max)
ns.disk = disk_max;
if (ns.disk < disk_min) {
if (warn)
*warn = IMPLICITLY_UPGRADED_DISK;
ns.disk = disk_min;
}
if (ns.pdsk > pdsk_max)
ns.pdsk = pdsk_max;
if (ns.pdsk < pdsk_min) {
if (warn)
*warn = IMPLICITLY_UPGRADED_PDSK;
ns.pdsk = pdsk_min;
}
if (fp == FP_STONITH &&
(ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) &&
!(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_device *device, enum drbd_conns cs)
{
if (first_peer_device(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, and global_state_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;
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);
/* 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();
/* 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(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(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;
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);
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 *),
char *why, enum bm_flag flags)
{
int rv;
D_ASSERT(device, current == first_peer_device(device)->connection->worker.task);
/* open coded non-blocking drbd_suspend_io(device); */
set_bit(SUSPEND_IO, &device->flags);
drbd_bm_lock(device, why, flags);
rv = io_fn(device);
drbd_bm_unlock(device);
drbd_resume_io(device);
return rv;
}
/**
* after_state_ch() - Perform after state change actions that may sleep
* @device: DRBD device.
* @os: old state.
* @ns: new state.
* @flags: Flags
*/
static void after_state_ch(struct drbd_device *device, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags)
{
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;
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_NEGOTIATING)
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();
_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);
/* 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(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_SECONDARY && 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);
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);
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);
/* 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);
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 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(device)) {
drbd_queue_bitmap_io(device, &drbd_bm_write_copy_pages, NULL,
"write from resync_finished", BM_LOCKED_CHANGE_ALLOWED);
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;
};
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;
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(&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);
synchronize_rcu();
kfree(old_conf);
}
if (ns_max.susp_fen) {
/* case1: The outdate peer handler is successful: */
if (ns_max.pdsk <= D_OUTDATED) {
rcu_read_lock();
idr_for_each_entry(&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);
}
}
kref_put(&connection->kref, drbd_destroy_connection);
conn_md_sync(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);
if (rv < SS_SUCCESS)
BUG();
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;
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;
}
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);
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;
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;
}
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