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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_req.h"
struct after_state_chg_work {
struct drbd_work w;
union drbd_state os;
union drbd_state ns;
enum chg_state_flags flags;
struct completion *done;
};
extern void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what);
int drbd_send_state_req(struct drbd_conf *, union drbd_state, union drbd_state);
static int w_after_state_ch(struct drbd_work *w, int unused);
static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags);
static void after_conn_state_ch(struct drbd_tconn *tconn, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags);
static enum drbd_state_rv is_valid_state(struct drbd_conf *, union drbd_state);
static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state);
static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns);
static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
const char **warn_sync_abort);
/**
* cl_wide_st_chg() - true if the state change is a cluster wide one
* @mdev: DRBD device.
* @os: old (current) state.
* @ns: new (wanted) state.
*/
static int cl_wide_st_chg(struct drbd_conf *mdev,
union drbd_state os, union drbd_state ns)
{
return (os.conn >= C_CONNECTED && ns.conn >= C_CONNECTED &&
((os.role != R_PRIMARY && ns.role == R_PRIMARY) ||
(os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
(os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S) ||
(os.disk != D_DISKLESS && ns.disk == D_DISKLESS))) ||
(os.conn >= C_CONNECTED && ns.conn == C_DISCONNECTING) ||
(os.conn == C_CONNECTED && ns.conn == C_VERIFY_S);
}
static union drbd_state
apply_mask_val(union drbd_state os, union drbd_state mask, union drbd_state val)
{
union drbd_state ns;
ns.i = (os.i & ~mask.i) | val.i;
return ns;
}
enum drbd_state_rv
drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f,
union drbd_state mask, union drbd_state val)
{
unsigned long flags;
union drbd_state ns;
enum drbd_state_rv rv;
spin_lock_irqsave(&mdev->tconn->req_lock, flags);
ns = apply_mask_val(mdev->state, mask, val);
rv = _drbd_set_state(mdev, ns, f, NULL);
ns = mdev->state;
spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
return rv;
}
/**
* drbd_force_state() - Impose a change which happens outside our control on our state
* @mdev: DRBD device.
* @mask: mask of state bits to change.
* @val: value of new state bits.
*/
void drbd_force_state(struct drbd_conf *mdev,
union drbd_state mask, union drbd_state val)
{
drbd_change_state(mdev, CS_HARD, mask, val);
}
static enum drbd_state_rv
_req_st_cond(struct drbd_conf *mdev, union drbd_state mask,
union drbd_state val)
{
union drbd_state os, ns;
unsigned long flags;
enum drbd_state_rv rv;
if (test_and_clear_bit(CL_ST_CHG_SUCCESS, &mdev->flags))
return SS_CW_SUCCESS;
if (test_and_clear_bit(CL_ST_CHG_FAIL, &mdev->flags))
return SS_CW_FAILED_BY_PEER;
spin_lock_irqsave(&mdev->tconn->req_lock, flags);
os = mdev->state;
ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
rv = is_valid_transition(os, ns);
if (rv == SS_SUCCESS)
rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
if (!cl_wide_st_chg(mdev, os, ns))
rv = SS_CW_NO_NEED;
if (rv == SS_UNKNOWN_ERROR) {
rv = is_valid_state(mdev, ns);
if (rv == SS_SUCCESS) {
rv = is_valid_soft_transition(os, ns);
if (rv == SS_SUCCESS)
rv = SS_UNKNOWN_ERROR; /* cont waiting, otherwise fail. */
}
}
spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
return rv;
}
/**
* drbd_req_state() - Perform an eventually cluster wide state change
* @mdev: DRBD device.
* @mask: mask of state bits to change.
* @val: value of new state bits.
* @f: flags
*
* Should not be called directly, use drbd_request_state() or
* _drbd_request_state().
*/
static enum drbd_state_rv
drbd_req_state(struct drbd_conf *mdev, union drbd_state mask,
union drbd_state val, enum chg_state_flags f)
{
struct completion done;
unsigned long flags;
union drbd_state os, ns;
enum drbd_state_rv rv;
init_completion(&done);
if (f & CS_SERIALIZE)
mutex_lock(&mdev->state_mutex);
spin_lock_irqsave(&mdev->tconn->req_lock, flags);
os = mdev->state;
ns = sanitize_state(mdev, apply_mask_val(os, mask, val), NULL);
rv = is_valid_transition(os, ns);
if (rv < SS_SUCCESS)
goto abort;
if (cl_wide_st_chg(mdev, os, ns)) {
rv = is_valid_state(mdev, ns);
if (rv == SS_SUCCESS)
rv = is_valid_soft_transition(os, ns);
spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
if (rv < SS_SUCCESS) {
if (f & CS_VERBOSE)
print_st_err(mdev, os, ns, rv);
goto abort;
}
drbd_state_lock(mdev);
if (!drbd_send_state_req(mdev, mask, val)) {
drbd_state_unlock(mdev);
rv = SS_CW_FAILED_BY_PEER;
if (f & CS_VERBOSE)
print_st_err(mdev, os, ns, rv);
goto abort;
}
wait_event(mdev->state_wait,
(rv = _req_st_cond(mdev, mask, val)));
if (rv < SS_SUCCESS) {
drbd_state_unlock(mdev);
if (f & CS_VERBOSE)
print_st_err(mdev, os, ns, rv);
goto abort;
}
spin_lock_irqsave(&mdev->tconn->req_lock, flags);
ns = apply_mask_val(mdev->state, mask, val);
rv = _drbd_set_state(mdev, ns, f, &done);
drbd_state_unlock(mdev);
} else {
rv = _drbd_set_state(mdev, ns, f, &done);
}
spin_unlock_irqrestore(&mdev->tconn->req_lock, flags);
if (f & CS_WAIT_COMPLETE && rv == SS_SUCCESS) {
D_ASSERT(current != mdev->tconn->worker.task);
wait_for_completion(&done);
}
abort:
if (f & CS_SERIALIZE)
mutex_unlock(&mdev->state_mutex);
return rv;
}
/**
* _drbd_request_state() - Request a state change (with flags)
* @mdev: DRBD device.
* @mask: mask of state bits to change.
* @val: value of new state bits.
* @f: flags
*
* Cousin of drbd_request_state(), useful with the CS_WAIT_COMPLETE
* flag, or when logging of failed state change requests is not desired.
*/
enum drbd_state_rv
_drbd_request_state(struct drbd_conf *mdev, union drbd_state mask,
union drbd_state val, enum chg_state_flags f)
{
enum drbd_state_rv rv;
wait_event(mdev->state_wait,
(rv = drbd_req_state(mdev, mask, val, f)) != SS_IN_TRANSIENT_STATE);
return rv;
}
static void print_st(struct drbd_conf *mdev, char *name, union drbd_state ns)
{
dev_err(DEV, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n",
name,
drbd_conn_str(ns.conn),
drbd_role_str(ns.role),
drbd_role_str(ns.peer),
drbd_disk_str(ns.disk),
drbd_disk_str(ns.pdsk),
is_susp(ns) ? 's' : 'r',
ns.aftr_isp ? 'a' : '-',
ns.peer_isp ? 'p' : '-',
ns.user_isp ? 'u' : '-',
ns.susp_fen ? 'F' : '-',
ns.susp_nod ? 'N' : '-'
);
}
void print_st_err(struct drbd_conf *mdev, union drbd_state os,
union drbd_state ns, enum drbd_state_rv err)
{
if (err == SS_IN_TRANSIENT_STATE)
return;
dev_err(DEV, "State change failed: %s\n", drbd_set_st_err_str(err));
print_st(mdev, " state", os);
print_st(mdev, "wanted", ns);
}
/**
* is_valid_state() - Returns an SS_ error code if ns is not valid
* @mdev: DRBD device.
* @ns: State to consider.
*/
static enum drbd_state_rv
is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
{
/* See drbd_state_sw_errors in drbd_strings.c */
enum drbd_fencing_p fp;
enum drbd_state_rv rv = SS_SUCCESS;
fp = FP_DONT_CARE;
if (get_ldev(mdev)) {
fp = mdev->ldev->dc.fencing;
put_ldev(mdev);
}
if (get_net_conf(mdev->tconn)) {
if (!mdev->tconn->net_conf->two_primaries &&
ns.role == R_PRIMARY && ns.peer == R_PRIMARY)
rv = SS_TWO_PRIMARIES;
put_net_conf(mdev->tconn);
}
if (rv <= 0)
/* already found a reason to abort */;
else if (ns.role == R_SECONDARY && mdev->open_cnt)
rv = SS_DEVICE_IN_USE;
else if (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.disk < D_UP_TO_DATE)
rv = SS_NO_UP_TO_DATE_DISK;
else if (fp >= FP_RESOURCE &&
ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk >= D_UNKNOWN)
rv = SS_PRIMARY_NOP;
else if (ns.role == R_PRIMARY && ns.disk <= D_INCONSISTENT && ns.pdsk <= D_INCONSISTENT)
rv = SS_NO_UP_TO_DATE_DISK;
else if (ns.conn > C_CONNECTED && ns.disk < D_INCONSISTENT)
rv = SS_NO_LOCAL_DISK;
else if (ns.conn > C_CONNECTED && ns.pdsk < D_INCONSISTENT)
rv = SS_NO_REMOTE_DISK;
else if (ns.conn > C_CONNECTED && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE)
rv = SS_NO_UP_TO_DATE_DISK;
else if ((ns.conn == C_CONNECTED ||
ns.conn == C_WF_BITMAP_S ||
ns.conn == C_SYNC_SOURCE ||
ns.conn == C_PAUSED_SYNC_S) &&
ns.disk == D_OUTDATED)
rv = SS_CONNECTED_OUTDATES;
else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
(mdev->sync_conf.verify_alg[0] == 0))
rv = SS_NO_VERIFY_ALG;
else if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
mdev->tconn->agreed_pro_version < 88)
rv = SS_NOT_SUPPORTED;
else if (ns.conn >= C_CONNECTED && ns.pdsk == D_UNKNOWN)
rv = SS_CONNECTED_OUTDATES;
return rv;
}
/**
* is_valid_soft_transition() - Returns an SS_ error code if the state transition is not possible
* This function limits state transitions that may be declined by DRBD. I.e.
* user requests (aka soft transitions).
* @mdev: DRBD device.
* @ns: new state.
* @os: old state.
*/
static enum drbd_state_rv
is_valid_soft_transition(union drbd_state os, union drbd_state ns)
{
enum drbd_state_rv rv = SS_SUCCESS;
if ((ns.conn == C_STARTING_SYNC_T || ns.conn == C_STARTING_SYNC_S) &&
os.conn > C_CONNECTED)
rv = SS_RESYNC_RUNNING;
if (ns.conn == C_DISCONNECTING && os.conn == C_STANDALONE)
rv = SS_ALREADY_STANDALONE;
if (ns.disk > D_ATTACHING && os.disk == D_DISKLESS)
rv = SS_IS_DISKLESS;
if (ns.conn == C_WF_CONNECTION && os.conn < C_UNCONNECTED)
rv = SS_NO_NET_CONFIG;
if (ns.disk == D_OUTDATED && os.disk < D_OUTDATED && os.disk != D_ATTACHING)
rv = SS_LOWER_THAN_OUTDATED;
if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
rv = SS_IN_TRANSIENT_STATE;
if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
rv = SS_IN_TRANSIENT_STATE;
if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
rv = SS_NEED_CONNECTION;
if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) &&
ns.conn != os.conn && os.conn > C_CONNECTED)
rv = SS_RESYNC_RUNNING;
if ((ns.conn == C_STARTING_SYNC_S || ns.conn == C_STARTING_SYNC_T) &&
os.conn < C_CONNECTED)
rv = SS_NEED_CONNECTION;
if ((ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)
&& os.conn < C_WF_REPORT_PARAMS)
rv = SS_NEED_CONNECTION; /* No NetworkFailure -> SyncTarget etc... */
return rv;
}
static enum drbd_state_rv
is_valid_conn_transition(enum drbd_conns oc, enum drbd_conns nc)
{
enum drbd_state_rv rv = SS_SUCCESS;
/* Disallow Network errors to configure a device's network part */
if ((nc >= C_TIMEOUT && nc <= C_TEAR_DOWN) && oc <= C_DISCONNECTING)
rv = SS_NEED_CONNECTION;
/* After a network error only C_UNCONNECTED or C_DISCONNECTING may follow. */
if (oc >= C_TIMEOUT && oc <= C_TEAR_DOWN && nc != C_UNCONNECTED && nc != C_DISCONNECTING)
rv = SS_IN_TRANSIENT_STATE;
/* After C_DISCONNECTING only C_STANDALONE may follow */
if (oc == C_DISCONNECTING && nc != C_STANDALONE)
rv = SS_IN_TRANSIENT_STATE;
return rv;
}
/**
* is_valid_transition() - Returns an SS_ error code if the state transition is not possible
* This limits hard state transitions. Hard state transitions are facts there are
* imposed on DRBD by the environment. E.g. disk broke or network broke down.
* But those hard state transitions are still not allowed to do everything.
* @ns: new state.
* @os: old state.
*/
static enum drbd_state_rv
is_valid_transition(union drbd_state os, union drbd_state ns)
{
enum drbd_state_rv rv;
rv = is_valid_conn_transition(os.conn, ns.conn);
/* we cannot fail (again) if we already detached */
if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
rv = SS_IS_DISKLESS;
/* if we are only D_ATTACHING yet,
* we can (and should) go directly to D_DISKLESS. */
if (ns.disk == D_FAILED && os.disk == D_ATTACHING) {
printk("TODO: FIX ME\n");
rv = SS_IS_DISKLESS;
}
return rv;
}
/**
* sanitize_state() - Resolves implicitly necessary additional changes to a state transition
* @mdev: DRBD device.
* @os: old state.
* @ns: new state.
* @warn_sync_abort:
*
* When we loose connection, we have to set the state of the peers disk (pdsk)
* to D_UNKNOWN. This rule and many more along those lines are in this function.
*/
static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state ns,
const char **warn_sync_abort)
{
enum drbd_fencing_p fp;
enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
fp = FP_DONT_CARE;
if (get_ldev(mdev)) {
fp = mdev->ldev->dc.fencing;
put_ldev(mdev);
}
/* Implications from connection to peer and peer_isp */
if (ns.conn < C_CONNECTED) {
ns.peer_isp = 0;
ns.peer = R_UNKNOWN;
if (ns.pdsk > D_UNKNOWN || ns.pdsk < D_INCONSISTENT)
ns.pdsk = D_UNKNOWN;
}
/* Clear the aftr_isp when becoming unconfigured */
if (ns.conn == C_STANDALONE && ns.disk == D_DISKLESS && ns.role == R_SECONDARY)
ns.aftr_isp = 0;
/* An implication of the disk states onto the connection state */
/* Abort resync if a disk fails/detaches */
if (ns.conn > C_CONNECTED && (ns.disk <= D_FAILED || ns.pdsk <= D_FAILED)) {
if (warn_sync_abort)
*warn_sync_abort =
ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T ?
"Online-verify" : "Resync";
ns.conn = C_CONNECTED;
}
/* Connection breaks down before we finished "Negotiating" */
if (ns.conn < C_CONNECTED && ns.disk == D_NEGOTIATING &&
get_ldev_if_state(mdev, D_NEGOTIATING)) {
if (mdev->ed_uuid == mdev->ldev->md.uuid[UI_CURRENT]) {
ns.disk = mdev->new_state_tmp.disk;
ns.pdsk = mdev->new_state_tmp.pdsk;
} else {
dev_alert(DEV, "Connection lost while negotiating, no data!\n");
ns.disk = D_DISKLESS;
ns.pdsk = D_UNKNOWN;
}
put_ldev(mdev);
}
/* D_CONSISTENT and D_OUTDATED vanish when we get connected */
if (ns.conn >= C_CONNECTED && ns.conn < C_AHEAD) {
if (ns.disk == D_CONSISTENT || ns.disk == D_OUTDATED)
ns.disk = D_UP_TO_DATE;
if (ns.pdsk == D_CONSISTENT || ns.pdsk == D_OUTDATED)
ns.pdsk = D_UP_TO_DATE;
}
/* Implications of the connection stat on the disk states */
disk_min = D_DISKLESS;
disk_max = D_UP_TO_DATE;
pdsk_min = D_INCONSISTENT;
pdsk_max = D_UNKNOWN;
switch ((enum drbd_conns)ns.conn) {
case C_WF_BITMAP_T:
case C_PAUSED_SYNC_T:
case C_STARTING_SYNC_T:
case C_WF_SYNC_UUID:
case C_BEHIND:
disk_min = D_INCONSISTENT;
disk_max = D_OUTDATED;
pdsk_min = D_UP_TO_DATE;
pdsk_max = D_UP_TO_DATE;
break;
case C_VERIFY_S:
case C_VERIFY_T:
disk_min = D_UP_TO_DATE;
disk_max = D_UP_TO_DATE;
pdsk_min = D_UP_TO_DATE;
pdsk_max = D_UP_TO_DATE;
break;
case C_CONNECTED:
disk_min = D_DISKLESS;
disk_max = D_UP_TO_DATE;
pdsk_min = D_DISKLESS;
pdsk_max = D_UP_TO_DATE;
break;
case C_WF_BITMAP_S:
case C_PAUSED_SYNC_S:
case C_STARTING_SYNC_S:
case C_AHEAD:
disk_min = D_UP_TO_DATE;
disk_max = D_UP_TO_DATE;
pdsk_min = D_INCONSISTENT;
pdsk_max = D_CONSISTENT; /* D_OUTDATED would be nice. But explicit outdate necessary*/
break;
case C_SYNC_TARGET:
disk_min = D_INCONSISTENT;
disk_max = D_INCONSISTENT;
pdsk_min = D_UP_TO_DATE;
pdsk_max = D_UP_TO_DATE;
break;
case C_SYNC_SOURCE:
disk_min = D_UP_TO_DATE;
disk_max = D_UP_TO_DATE;
pdsk_min = D_INCONSISTENT;
pdsk_max = D_INCONSISTENT;
break;
case C_STANDALONE:
case C_DISCONNECTING:
case C_UNCONNECTED:
case C_TIMEOUT:
case C_BROKEN_PIPE:
case C_NETWORK_FAILURE:
case C_PROTOCOL_ERROR:
case C_TEAR_DOWN:
case C_WF_CONNECTION:
case C_WF_REPORT_PARAMS:
case C_MASK:
break;
}
if (ns.disk > disk_max)
ns.disk = disk_max;
if (ns.disk < disk_min) {
dev_warn(DEV, "Implicitly set disk from %s to %s\n",
drbd_disk_str(ns.disk), drbd_disk_str(disk_min));
ns.disk = disk_min;
}
if (ns.pdsk > pdsk_max)
ns.pdsk = pdsk_max;
if (ns.pdsk < pdsk_min) {
dev_warn(DEV, "Implicitly set pdsk from %s to %s\n",
drbd_disk_str(ns.pdsk), drbd_disk_str(pdsk_min));
ns.pdsk = pdsk_min;
}
if (fp == FP_STONITH &&
(ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED))
ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
if (mdev->sync_conf.on_no_data == OND_SUSPEND_IO &&
(ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
if (ns.conn == C_SYNC_SOURCE)
ns.conn = C_PAUSED_SYNC_S;
if (ns.conn == C_SYNC_TARGET)
ns.conn = C_PAUSED_SYNC_T;
} else {
if (ns.conn == C_PAUSED_SYNC_S)
ns.conn = C_SYNC_SOURCE;
if (ns.conn == C_PAUSED_SYNC_T)
ns.conn = C_SYNC_TARGET;
}
return ns;
}
void drbd_resume_al(struct drbd_conf *mdev)
{
if (test_and_clear_bit(AL_SUSPENDED, &mdev->flags))
dev_info(DEV, "Resumed AL updates\n");
}
/* helper for __drbd_set_state */
static void set_ov_position(struct drbd_conf *mdev, enum drbd_conns cs)
{
if (mdev->tconn->agreed_pro_version < 90)
mdev->ov_start_sector = 0;
mdev->rs_total = drbd_bm_bits(mdev);
mdev->ov_position = 0;
if (cs == C_VERIFY_T) {
/* starting online verify from an arbitrary position
* does not fit well into the existing protocol.
* on C_VERIFY_T, we initialize ov_left and friends
* implicitly in receive_DataRequest once the
* first P_OV_REQUEST is received */
mdev->ov_start_sector = ~(sector_t)0;
} else {
unsigned long bit = BM_SECT_TO_BIT(mdev->ov_start_sector);
if (bit >= mdev->rs_total) {
mdev->ov_start_sector =
BM_BIT_TO_SECT(mdev->rs_total - 1);
mdev->rs_total = 1;
} else
mdev->rs_total -= bit;
mdev->ov_position = mdev->ov_start_sector;
}
mdev->ov_left = mdev->rs_total;
}
/**
* __drbd_set_state() - Set a new DRBD state
* @mdev: DRBD device.
* @ns: new state.
* @flags: Flags
* @done: Optional completion, that will get completed after the after_state_ch() finished
*
* Caller needs to hold req_lock, and global_state_lock. Do not call directly.
*/
enum drbd_state_rv
__drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
enum chg_state_flags flags, struct completion *done)
{
union drbd_state os;
enum drbd_state_rv rv = SS_SUCCESS;
const char *warn_sync_abort = NULL;
struct after_state_chg_work *ascw;
os = mdev->state;
ns = sanitize_state(mdev, ns, &warn_sync_abort);
if (ns.i == os.i)
return SS_NOTHING_TO_DO;
rv = is_valid_transition(os, ns);
if (rv < SS_SUCCESS)
return rv;
if (!(flags & CS_HARD)) {
/* pre-state-change checks ; only look at ns */
/* See drbd_state_sw_errors in drbd_strings.c */
rv = is_valid_state(mdev, ns);
if (rv < SS_SUCCESS) {
/* If the old state was illegal as well, then let
this happen...*/
if (is_valid_state(mdev, os) == rv)
rv = is_valid_soft_transition(os, ns);
} else
rv = is_valid_soft_transition(os, ns);
}
if (rv < SS_SUCCESS) {
if (flags & CS_VERBOSE)
print_st_err(mdev, os, ns, rv);
return rv;
}
if (warn_sync_abort)
dev_warn(DEV, "%s aborted.\n", warn_sync_abort);
{
char *pbp, pb[300];
pbp = pb;
*pbp = 0;
if (ns.role != os.role)
pbp += sprintf(pbp, "role( %s -> %s ) ",
drbd_role_str(os.role),
drbd_role_str(ns.role));
if (ns.peer != os.peer)
pbp += sprintf(pbp, "peer( %s -> %s ) ",
drbd_role_str(os.peer),
drbd_role_str(ns.peer));
if (ns.conn != os.conn)
pbp += sprintf(pbp, "conn( %s -> %s ) ",
drbd_conn_str(os.conn),
drbd_conn_str(ns.conn));
if (ns.disk != os.disk)
pbp += sprintf(pbp, "disk( %s -> %s ) ",
drbd_disk_str(os.disk),
drbd_disk_str(ns.disk));
if (ns.pdsk != os.pdsk)
pbp += sprintf(pbp, "pdsk( %s -> %s ) ",
drbd_disk_str(os.pdsk),
drbd_disk_str(ns.pdsk));
if (is_susp(ns) != is_susp(os))
pbp += sprintf(pbp, "susp( %d -> %d ) ",
is_susp(os),
is_susp(ns));
if (ns.aftr_isp != os.aftr_isp)
pbp += sprintf(pbp, "aftr_isp( %d -> %d ) ",
os.aftr_isp,
ns.aftr_isp);
if (ns.peer_isp != os.peer_isp)
pbp += sprintf(pbp, "peer_isp( %d -> %d ) ",
os.peer_isp,
ns.peer_isp);
if (ns.user_isp != os.user_isp)
pbp += sprintf(pbp, "user_isp( %d -> %d ) ",
os.user_isp,
ns.user_isp);
dev_info(DEV, "%s\n", pb);
}
/* solve the race between becoming unconfigured,
* worker doing the cleanup, and
* admin reconfiguring us:
* on (re)configure, first set CONFIG_PENDING,
* then wait for a potentially exiting worker,
* start the worker, and schedule one no_op.
* then proceed with configuration.
*/
if (ns.disk == D_DISKLESS &&
ns.conn == C_STANDALONE &&
ns.role == R_SECONDARY &&
!test_and_set_bit(CONFIG_PENDING, &mdev->flags))
set_bit(DEVICE_DYING, &mdev->flags);
/* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
* on the ldev here, to be sure the transition -> D_DISKLESS resp.
* drbd_ldev_destroy() won't happen before our corresponding
* after_state_ch works run, where we put_ldev again. */
if ((os.disk != D_FAILED && ns.disk == D_FAILED) ||
(os.disk != D_DISKLESS && ns.disk == D_DISKLESS))
atomic_inc(&mdev->local_cnt);
mdev->state = ns;
if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING)
drbd_print_uuids(mdev, "attached to UUIDs");
wake_up(&mdev->misc_wait);
wake_up(&mdev->state_wait);
wake_up(&mdev->tconn->ping_wait);
/* aborted verify run. log the last position */
if ((os.conn == C_VERIFY_S || os.conn == C_VERIFY_T) &&
ns.conn < C_CONNECTED) {
mdev->ov_start_sector =
BM_BIT_TO_SECT(drbd_bm_bits(mdev) - mdev->ov_left);
dev_info(DEV, "Online Verify reached sector %llu\n",
(unsigned long long)mdev->ov_start_sector);
}
if ((os.conn == C_PAUSED_SYNC_T || os.conn == C_PAUSED_SYNC_S) &&
(ns.conn == C_SYNC_TARGET || ns.conn == C_SYNC_SOURCE)) {
dev_info(DEV, "Syncer continues.\n");
mdev->rs_paused += (long)jiffies
-(long)mdev->rs_mark_time[mdev->rs_last_mark];
if (ns.conn == C_SYNC_TARGET)
mod_timer(&mdev->resync_timer, jiffies);
}
if ((os.conn == C_SYNC_TARGET || os.conn == C_SYNC_SOURCE) &&
(ns.conn == C_PAUSED_SYNC_T || ns.conn == C_PAUSED_SYNC_S)) {
dev_info(DEV, "Resync suspended\n");
mdev->rs_mark_time[mdev->rs_last_mark] = jiffies;
}
if (os.conn == C_CONNECTED &&
(ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T)) {
unsigned long now = jiffies;
int i;
set_ov_position(mdev, ns.conn);
mdev->rs_start = now;
mdev->rs_last_events = 0;
mdev->rs_last_sect_ev = 0;
mdev->ov_last_oos_size = 0;
mdev->ov_last_oos_start = 0;
for (i = 0; i < DRBD_SYNC_MARKS; i++) {
mdev->rs_mark_left[i] = mdev->ov_left;
mdev->rs_mark_time[i] = now;
}
drbd_rs_controller_reset(mdev);
if (ns.conn == C_VERIFY_S) {
dev_info(DEV, "Starting Online Verify from sector %llu\n",
(unsigned long long)mdev->ov_position);
mod_timer(&mdev->resync_timer, jiffies);
}
}
if (get_ldev(mdev)) {
u32 mdf = mdev->ldev->md.flags & ~(MDF_CONSISTENT|MDF_PRIMARY_IND|
MDF_CONNECTED_IND|MDF_WAS_UP_TO_DATE|
MDF_PEER_OUT_DATED|MDF_CRASHED_PRIMARY);
if (test_bit(CRASHED_PRIMARY, &mdev->flags))
mdf |= MDF_CRASHED_PRIMARY;
if (mdev->state.role == R_PRIMARY ||
(mdev->state.pdsk < D_INCONSISTENT && mdev->state.peer == R_PRIMARY))
mdf |= MDF_PRIMARY_IND;
if (mdev->state.conn > C_WF_REPORT_PARAMS)
mdf |= MDF_CONNECTED_IND;
if (mdev->state.disk > D_INCONSISTENT)
mdf |= MDF_CONSISTENT;
if (mdev->state.disk > D_OUTDATED)
mdf |= MDF_WAS_UP_TO_DATE;
if (mdev->state.pdsk <= D_OUTDATED && mdev->state.pdsk >= D_INCONSISTENT)
mdf |= MDF_PEER_OUT_DATED;
if (mdf != mdev->ldev->md.flags) {
mdev->ldev->md.flags = mdf;
drbd_md_mark_dirty(mdev);
}
if (os.disk < D_CONSISTENT && ns.disk >= D_CONSISTENT)
drbd_set_ed_uuid(mdev, mdev->ldev->md.uuid[UI_CURRENT]);
put_ldev(mdev);
}
/* Peer was forced D_UP_TO_DATE & R_PRIMARY, consider to resync */
if (os.disk == D_INCONSISTENT && os.pdsk == D_INCONSISTENT &&
os.peer == R_SECONDARY && ns.peer == R_PRIMARY)
set_bit(CONSIDER_RESYNC, &mdev->flags);
/* Receiver should clean up itself */
if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
drbd_thread_stop_nowait(&mdev->tconn->receiver);
/* Now the receiver finished cleaning up itself, it should die */
if (os.conn != C_STANDALONE && ns.conn == C_STANDALONE)
drbd_thread_stop_nowait(&mdev->tconn->receiver);
/* Upon network failure, we need to restart the receiver. */
if (os.conn > C_TEAR_DOWN &&
ns.conn <= C_TEAR_DOWN && ns.conn >= C_TIMEOUT)
drbd_thread_restart_nowait(&mdev->tconn->receiver);
/* Resume AL writing if we get a connection */
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
drbd_resume_al(mdev);
ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
if (ascw) {
ascw->os = os;
ascw->ns = ns;
ascw->flags = flags;
ascw->w.cb = w_after_state_ch;
ascw->w.mdev = mdev;
ascw->done = done;
drbd_queue_work(&mdev->tconn->data.work, &ascw->w);
} else {
dev_warn(DEV, "Could not kmalloc an ascw\n");
}
return rv;
}
static int w_after_state_ch(struct drbd_work *w, int unused)
{
struct after_state_chg_work *ascw =
container_of(w, struct after_state_chg_work, w);
struct drbd_conf *mdev = w->mdev;
after_state_ch(mdev, ascw->os, ascw->ns, ascw->flags);
if (ascw->flags & CS_WAIT_COMPLETE) {
D_ASSERT(ascw->done != NULL);
complete(ascw->done);
}
kfree(ascw);
return 1;
}
static void abw_start_sync(struct drbd_conf *mdev, int rv)
{
if (rv) {
dev_err(DEV, "Writing the bitmap failed not starting resync.\n");
_drbd_request_state(mdev, NS(conn, C_CONNECTED), CS_VERBOSE);
return;
}
switch (mdev->state.conn) {
case C_STARTING_SYNC_T:
_drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE);
break;
case C_STARTING_SYNC_S:
drbd_start_resync(mdev, C_SYNC_SOURCE);
break;
}
}
int drbd_bitmap_io_from_worker(struct drbd_conf *mdev,
int (*io_fn)(struct drbd_conf *),
char *why, enum bm_flag flags)
{
int rv;
D_ASSERT(current == mdev->tconn->worker.task);
/* open coded non-blocking drbd_suspend_io(mdev); */
set_bit(SUSPEND_IO, &mdev->flags);
drbd_bm_lock(mdev, why, flags);
rv = io_fn(mdev);
drbd_bm_unlock(mdev);
drbd_resume_io(mdev);
return rv;
}
/**
* after_state_ch() - Perform after state change actions that may sleep
* @mdev: DRBD device.
* @os: old state.
* @ns: new state.
* @flags: Flags
*/
static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags)
{
enum drbd_fencing_p fp;
enum drbd_req_event what = NOTHING;
union drbd_state nsm = (union drbd_state){ .i = -1 };
if (os.conn != C_CONNECTED && ns.conn == C_CONNECTED) {
clear_bit(CRASHED_PRIMARY, &mdev->flags);
if (mdev->p_uuid)
mdev->p_uuid[UI_FLAGS] &= ~((u64)2);
}
fp = FP_DONT_CARE;
if (get_ldev(mdev)) {
fp = mdev->ldev->dc.fencing;
put_ldev(mdev);
}
/* Inform userspace about the change... */
drbd_bcast_state(mdev, ns);
if (!(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE) &&
(ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
drbd_khelper(mdev, "pri-on-incon-degr");
/* Here we have the actions that are performed after a
state change. This function might sleep */
nsm.i = -1;
if (ns.susp_nod) {
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
what = RESEND;
if (os.disk == D_ATTACHING && ns.disk > D_ATTACHING)
what = RESTART_FROZEN_DISK_IO;
if (what != NOTHING)
nsm.susp_nod = 0;
}
if (ns.susp_fen) {
/* case1: The outdate peer handler is successful: */
if (os.pdsk > D_OUTDATED && ns.pdsk <= D_OUTDATED) {
tl_clear(mdev);
if (test_bit(NEW_CUR_UUID, &mdev->flags)) {
drbd_uuid_new_current(mdev);
clear_bit(NEW_CUR_UUID, &mdev->flags);
}
spin_lock_irq(&mdev->tconn->req_lock);
_drbd_set_state(_NS(mdev, susp_fen, 0), CS_VERBOSE, NULL);
spin_unlock_irq(&mdev->tconn->req_lock);
}
/* case2: The connection was established again: */
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED) {
clear_bit(NEW_CUR_UUID, &mdev->flags);
what = RESEND;
nsm.susp_fen = 0;
}
}
if (what != NOTHING) {
spin_lock_irq(&mdev->tconn->req_lock);
_tl_restart(mdev, what);
nsm.i &= mdev->state.i;
_drbd_set_state(mdev, nsm, CS_VERBOSE, NULL);
spin_unlock_irq(&mdev->tconn->req_lock);
}
/* Became sync source. With protocol >= 96, we still need to send out
* the sync uuid now. Need to do that before any drbd_send_state, or
* the other side may go "paused sync" before receiving the sync uuids,
* which is unexpected. */
if ((os.conn != C_SYNC_SOURCE && os.conn != C_PAUSED_SYNC_S) &&
(ns.conn == C_SYNC_SOURCE || ns.conn == C_PAUSED_SYNC_S) &&
mdev->tconn->agreed_pro_version >= 96 && get_ldev(mdev)) {
drbd_gen_and_send_sync_uuid(mdev);
put_ldev(mdev);
}
/* Do not change the order of the if above and the two below... */
if (os.pdsk == D_DISKLESS && ns.pdsk > D_DISKLESS) { /* attach on the peer */
drbd_send_uuids(mdev);
drbd_send_state(mdev);
}
/* No point in queuing send_bitmap if we don't have a connection
* anymore, so check also the _current_ state, not only the new state
* at the time this work was queued. */
if (os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S &&
mdev->state.conn == C_WF_BITMAP_S)
drbd_queue_bitmap_io(mdev, &drbd_send_bitmap, NULL,
"send_bitmap (WFBitMapS)",
BM_LOCKED_TEST_ALLOWED);
/* Lost contact to peer's copy of the data */
if ((os.pdsk >= D_INCONSISTENT &&
os.pdsk != D_UNKNOWN &&
os.pdsk != D_OUTDATED)
&& (ns.pdsk < D_INCONSISTENT ||
ns.pdsk == D_UNKNOWN ||
ns.pdsk == D_OUTDATED)) {
if (get_ldev(mdev)) {
if ((ns.role == R_PRIMARY || ns.peer == R_PRIMARY) &&
mdev->ldev->md.uuid[UI_BITMAP] == 0 && ns.disk >= D_UP_TO_DATE) {
if (is_susp(mdev->state)) {
set_bit(NEW_CUR_UUID, &mdev->flags);
} else {
drbd_uuid_new_current(mdev);
drbd_send_uuids(mdev);
}
}
put_ldev(mdev);
}
}
if (ns.pdsk < D_INCONSISTENT && get_ldev(mdev)) {
if (ns.peer == R_PRIMARY && mdev->ldev->md.uuid[UI_BITMAP] == 0) {
drbd_uuid_new_current(mdev);
drbd_send_uuids(mdev);
}
/* D_DISKLESS Peer becomes secondary */
if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
/* We may still be Primary ourselves.
* No harm done if the bitmap still changes,
* redirtied pages will follow later. */
drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
"demote diskless peer", BM_LOCKED_SET_ALLOWED);
put_ldev(mdev);
}
/* Write out all changed bits on demote.
* Though, no need to da that just yet
* if there is a resync going on still */
if (os.role == R_PRIMARY && ns.role == R_SECONDARY &&
mdev->state.conn <= C_CONNECTED && get_ldev(mdev)) {
/* No changes to the bitmap expected this time, so assert that,
* even though no harm was done if it did change. */
drbd_bitmap_io_from_worker(mdev, &drbd_bm_write,
"demote", BM_LOCKED_TEST_ALLOWED);
put_ldev(mdev);
}
/* Last part of the attaching process ... */
if (ns.conn >= C_CONNECTED &&
os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
drbd_send_sizes(mdev, 0, 0); /* to start sync... */
drbd_send_uuids(mdev);
drbd_send_state(mdev);
}
/* We want to pause/continue resync, tell peer. */
if (ns.conn >= C_CONNECTED &&
((os.aftr_isp != ns.aftr_isp) ||
(os.user_isp != ns.user_isp)))
drbd_send_state(mdev);
/* In case one of the isp bits got set, suspend other devices. */
if ((!os.aftr_isp && !os.peer_isp && !os.user_isp) &&
(ns.aftr_isp || ns.peer_isp || ns.user_isp))
suspend_other_sg(mdev);
/* Make sure the peer gets informed about eventual state
changes (ISP bits) while we were in WFReportParams. */
if (os.conn == C_WF_REPORT_PARAMS && ns.conn >= C_CONNECTED)
drbd_send_state(mdev);
if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
drbd_send_state(mdev);
/* We are in the progress to start a full sync... */
if ((os.conn != C_STARTING_SYNC_T && ns.conn == C_STARTING_SYNC_T) ||
(os.conn != C_STARTING_SYNC_S && ns.conn == C_STARTING_SYNC_S))
/* no other bitmap changes expected during this phase */
drbd_queue_bitmap_io(mdev,
&drbd_bmio_set_n_write, &abw_start_sync,
"set_n_write from StartingSync", BM_LOCKED_TEST_ALLOWED);
/* We are invalidating our self... */
if (os.conn < C_CONNECTED && ns.conn < C_CONNECTED &&
os.disk > D_INCONSISTENT && ns.disk == D_INCONSISTENT)
/* other bitmap operation expected during this phase */
drbd_queue_bitmap_io(mdev, &drbd_bmio_set_n_write, NULL,
"set_n_write from invalidate", BM_LOCKED_MASK);
/* first half of local IO error, failure to attach,
* or administrative detach */
if (os.disk != D_FAILED && ns.disk == D_FAILED) {
enum drbd_io_error_p eh;
int was_io_error;
/* corresponding get_ldev was in __drbd_set_state, to serialize
* our cleanup here with the transition to D_DISKLESS,
* so it is safe to dreference ldev here. */
eh = mdev->ldev->dc.on_io_error;
was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
/* current state still has to be D_FAILED,
* there is only one way out: to D_DISKLESS,
* and that may only happen after our put_ldev below. */
if (mdev->state.disk != D_FAILED)
dev_err(DEV,
"ASSERT FAILED: disk is %s during detach\n",
drbd_disk_str(mdev->state.disk));
if (drbd_send_state(mdev))
dev_warn(DEV, "Notified peer that I am detaching my disk\n");
else
dev_err(DEV, "Sending state for detaching disk failed\n");
drbd_rs_cancel_all(mdev);
/* In case we want to get something to stable storage still,
* this may be the last chance.
* Following put_ldev may transition to D_DISKLESS. */
drbd_md_sync(mdev);
put_ldev(mdev);
if (was_io_error && eh == EP_CALL_HELPER)
drbd_khelper(mdev, "local-io-error");
}
/* second half of local IO error, failure to attach,
* or administrative detach,
* after local_cnt references have reached zero again */
if (os.disk != D_DISKLESS && ns.disk == D_DISKLESS) {
/* We must still be diskless,
* re-attach has to be serialized with this! */
if (mdev->state.disk != D_DISKLESS)
dev_err(DEV,
"ASSERT FAILED: disk is %s while going diskless\n",
drbd_disk_str(mdev->state.disk));
mdev->rs_total = 0;
mdev->rs_failed = 0;
atomic_set(&mdev->rs_pending_cnt, 0);
if (drbd_send_state(mdev))
dev_warn(DEV, "Notified peer that I'm now diskless.\n");
/* corresponding get_ldev in __drbd_set_state
* this may finally trigger drbd_ldev_destroy. */
put_ldev(mdev);
}
/* Notify peer that I had a local IO error, and did not detached.. */
if (os.disk == D_UP_TO_DATE && ns.disk == D_INCONSISTENT)
drbd_send_state(mdev);
/* Disks got bigger while they were detached */
if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
test_and_clear_bit(RESYNC_AFTER_NEG, &mdev->flags)) {
if (ns.conn == C_CONNECTED)
resync_after_online_grow(mdev);
}
/* A resync finished or aborted, wake paused devices... */
if ((os.conn > C_CONNECTED && ns.conn <= C_CONNECTED) ||
(os.peer_isp && !ns.peer_isp) ||
(os.user_isp && !ns.user_isp))
resume_next_sg(mdev);
/* sync target done with resync. Explicitly notify peer, even though
* it should (at least for non-empty resyncs) already know itself. */
if (os.disk < D_UP_TO_DATE && os.conn >= C_SYNC_SOURCE && ns.conn == C_CONNECTED)
drbd_send_state(mdev);
/* This triggers bitmap writeout of potentially still unwritten pages
* if the resync finished cleanly, or aborted because of peer disk
* failure, or because of connection loss.
* For resync aborted because of local disk failure, we cannot do
* any bitmap writeout anymore.
* No harm done if some bits change during this phase.
*/
if (os.conn > C_CONNECTED && ns.conn <= C_CONNECTED && get_ldev(mdev)) {
drbd_queue_bitmap_io(mdev, &drbd_bm_write, NULL,
"write from resync_finished", BM_LOCKED_SET_ALLOWED);
put_ldev(mdev);
}
if (ns.disk == D_DISKLESS &&
ns.conn == C_STANDALONE &&
ns.role == R_SECONDARY) {
if (os.aftr_isp != ns.aftr_isp)
resume_next_sg(mdev);
}
after_conn_state_ch(mdev->tconn, os, ns, flags);
drbd_md_sync(mdev);
}
static void after_conn_state_ch(struct drbd_tconn *tconn, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags)
{
/* Upon network configuration, we need to start the receiver */
if (os.conn == C_STANDALONE && ns.conn == C_UNCONNECTED)
drbd_thread_start(&tconn->receiver);
if (ns.disk == D_DISKLESS &&
ns.conn == C_STANDALONE &&
ns.role == R_SECONDARY) {
/* if (test_bit(DEVICE_DYING, &mdev->flags)) TODO: DEVICE_DYING functionality */
drbd_thread_stop_nowait(&tconn->worker);
}
}
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