[PATCH 05/18] drbd: refactor use of first_peer_device()

From: Philipp Reisner
Date: Mon Jun 30 2014 - 12:01:41 EST

From: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>

Reduce the number of calls to first_peer_device(). Instead, call
first_peer_device() just once to assign a local variable peer_device.

Signed-off-by: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Signed-off-by: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
---
drivers/block/drbd/drbd_nl.c | 30 +++++++++++-------
drivers/block/drbd/drbd_receiver.c | 18 ++++++-----
drivers/block/drbd/drbd_req.c | 25 ++++++++-------
drivers/block/drbd/drbd_state.c | 65 +++++++++++++++++++-------------------
drivers/block/drbd/drbd_worker.c | 55 +++++++++++++++++---------------
5 files changed, 105 insertions(+), 88 deletions(-)

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 25f4b6f..0bf8a60 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -552,8 +552,10 @@ void conn_try_outdate_peer_async(struct drbd_connection *connection)
}

enum drbd_state_rv
-drbd_set_role(struct drbd_device *device, enum drbd_role new_role, int force)
+drbd_set_role(struct drbd_device *const device, enum drbd_role new_role, int force)
{
+ struct drbd_peer_device *const peer_device = first_peer_device(device);
+ struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
const int max_tries = 4;
enum drbd_state_rv rv = SS_UNKNOWN_ERROR;
struct net_conf *nc;
@@ -601,7 +603,7 @@ drbd_set_role(struct drbd_device *device, enum drbd_role new_role, int force)
device->state.disk == D_CONSISTENT && mask.pdsk == 0) {
D_ASSERT(device, device->state.pdsk == D_UNKNOWN);

- if (conn_try_outdate_peer(first_peer_device(device)->connection)) {
+ if (conn_try_outdate_peer(connection)) {
val.disk = D_UP_TO_DATE;
mask.disk = D_MASK;
}
@@ -611,7 +613,7 @@ drbd_set_role(struct drbd_device *device, enum drbd_role new_role, int force)
if (rv == SS_NOTHING_TO_DO)
goto out;
if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
- if (!conn_try_outdate_peer(first_peer_device(device)->connection) && force) {
+ if (!conn_try_outdate_peer(connection) && force) {
drbd_warn(device, "Forced into split brain situation!\n");
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
@@ -624,7 +626,7 @@ drbd_set_role(struct drbd_device *device, enum drbd_role new_role, int force)
retry at most once more in this case. */
int timeo;
rcu_read_lock();
- nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
+ nc = rcu_dereference(connection->net_conf);
timeo = nc ? (nc->ping_timeo + 1) * HZ / 10 : 1;
rcu_read_unlock();
schedule_timeout_interruptible(timeo);
@@ -661,7 +663,7 @@ drbd_set_role(struct drbd_device *device, enum drbd_role new_role, int force)
} else {
/* Called from drbd_adm_set_role only.
* We are still holding the conf_update mutex. */
- nc = first_peer_device(device)->connection->net_conf;
+ nc = connection->net_conf;
if (nc)
nc->discard_my_data = 0; /* without copy; single bit op is atomic */

@@ -683,8 +685,8 @@ drbd_set_role(struct drbd_device *device, enum drbd_role new_role, int force)
if (device->state.conn >= C_WF_REPORT_PARAMS) {
/* if this was forced, we should consider sync */
if (forced)
- drbd_send_uuids(first_peer_device(device));
- drbd_send_current_state(first_peer_device(device));
+ drbd_send_uuids(peer_device);
+ drbd_send_current_state(peer_device);
}

drbd_md_sync(device);
@@ -1433,6 +1435,8 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
{
struct drbd_config_context adm_ctx;
struct drbd_device *device;
+ struct drbd_peer_device *peer_device;
+ struct drbd_connection *connection;
int err;
enum drbd_ret_code retcode;
enum determine_dev_size dd;
@@ -1455,7 +1459,9 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)

device = adm_ctx.device;
mutex_lock(&adm_ctx.resource->adm_mutex);
- conn_reconfig_start(first_peer_device(device)->connection);
+ peer_device = first_peer_device(device);
+ connection = peer_device ? peer_device->connection : NULL;
+ conn_reconfig_start(connection);

/* if you want to reconfigure, please tear down first */
if (device->state.disk > D_DISKLESS) {
@@ -1522,7 +1528,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
goto fail;

rcu_read_lock();
- nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
+ nc = rcu_dereference(connection->net_conf);
if (nc) {
if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
rcu_read_unlock();
@@ -1642,7 +1648,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
*/
wait_event(device->misc_wait, !atomic_read(&device->ap_pending_cnt) || drbd_suspended(device));
/* and for any other previously queued work */
- drbd_flush_workqueue(&first_peer_device(device)->connection->sender_work);
+ drbd_flush_workqueue(&connection->sender_work);

rv = _drbd_request_state(device, NS(disk, D_ATTACHING), CS_VERBOSE);
retcode = rv; /* FIXME: Type mismatch. */
@@ -1838,7 +1844,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)

kobject_uevent(&disk_to_dev(device->vdisk)->kobj, KOBJ_CHANGE);
put_ldev(device);
- conn_reconfig_done(first_peer_device(device)->connection);
+ conn_reconfig_done(connection);
mutex_unlock(&adm_ctx.resource->adm_mutex);
drbd_adm_finish(&adm_ctx, info, retcode);
return 0;
@@ -1849,7 +1855,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
drbd_force_state(device, NS(disk, D_DISKLESS));
drbd_md_sync(device);
fail:
- conn_reconfig_done(first_peer_device(device)->connection);
+ conn_reconfig_done(connection);
if (nbc) {
if (nbc->backing_bdev)
blkdev_put(nbc->backing_bdev,
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index be0c376..bb1434d 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -2857,8 +2857,10 @@ static void drbd_uuid_dump(struct drbd_device *device, char *text, u64 *uuid,
-1091 requires proto 91
-1096 requires proto 96
*/
-static int drbd_uuid_compare(struct drbd_device *device, int *rule_nr) __must_hold(local)
+static int drbd_uuid_compare(struct drbd_device *const device, int *rule_nr) __must_hold(local)
{
+ struct drbd_peer_device *const peer_device = first_peer_device(device);
+ struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
u64 self, peer;
int i, j;

@@ -2884,7 +2886,7 @@ static int drbd_uuid_compare(struct drbd_device *device, int *rule_nr) __must_ho

if (device->p_uuid[UI_BITMAP] == (u64)0 && device->ldev->md.uuid[UI_BITMAP] != (u64)0) {

- if (first_peer_device(device)->connection->agreed_pro_version < 91)
+ if (connection->agreed_pro_version < 91)
return -1091;

if ((device->ldev->md.uuid[UI_BITMAP] & ~((u64)1)) == (device->p_uuid[UI_HISTORY_START] & ~((u64)1)) &&
@@ -2907,7 +2909,7 @@ static int drbd_uuid_compare(struct drbd_device *device, int *rule_nr) __must_ho

if (device->ldev->md.uuid[UI_BITMAP] == (u64)0 && device->p_uuid[UI_BITMAP] != (u64)0) {

- if (first_peer_device(device)->connection->agreed_pro_version < 91)
+ if (connection->agreed_pro_version < 91)
return -1091;

if ((device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) == (device->p_uuid[UI_BITMAP] & ~((u64)1)) &&
@@ -2940,7 +2942,7 @@ static int drbd_uuid_compare(struct drbd_device *device, int *rule_nr) __must_ho
case 1: /* self_pri && !peer_pri */ return 1;
case 2: /* !self_pri && peer_pri */ return -1;
case 3: /* self_pri && peer_pri */
- dc = test_bit(RESOLVE_CONFLICTS, &first_peer_device(device)->connection->flags);
+ dc = test_bit(RESOLVE_CONFLICTS, &connection->flags);
return dc ? -1 : 1;
}
}
@@ -2953,14 +2955,14 @@ static int drbd_uuid_compare(struct drbd_device *device, int *rule_nr) __must_ho
*rule_nr = 51;
peer = device->p_uuid[UI_HISTORY_START] & ~((u64)1);
if (self == peer) {
- if (first_peer_device(device)->connection->agreed_pro_version < 96 ?
+ if (connection->agreed_pro_version < 96 ?
(device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1)) ==
(device->p_uuid[UI_HISTORY_START + 1] & ~((u64)1)) :
peer + UUID_NEW_BM_OFFSET == (device->p_uuid[UI_BITMAP] & ~((u64)1))) {
/* The last P_SYNC_UUID did not get though. Undo the last start of
resync as sync source modifications of the peer's UUIDs. */

- if (first_peer_device(device)->connection->agreed_pro_version < 91)
+ if (connection->agreed_pro_version < 91)
return -1091;

device->p_uuid[UI_BITMAP] = device->p_uuid[UI_HISTORY_START];
@@ -2990,14 +2992,14 @@ static int drbd_uuid_compare(struct drbd_device *device, int *rule_nr) __must_ho
*rule_nr = 71;
self = device->ldev->md.uuid[UI_HISTORY_START] & ~((u64)1);
if (self == peer) {
- if (first_peer_device(device)->connection->agreed_pro_version < 96 ?
+ if (connection->agreed_pro_version < 96 ?
(device->ldev->md.uuid[UI_HISTORY_START + 1] & ~((u64)1)) ==
(device->p_uuid[UI_HISTORY_START] & ~((u64)1)) :
self + UUID_NEW_BM_OFFSET == (device->ldev->md.uuid[UI_BITMAP] & ~((u64)1))) {
/* The last P_SYNC_UUID did not get though. Undo the last start of
resync as sync source modifications of our UUIDs. */

- if (first_peer_device(device)->connection->agreed_pro_version < 91)
+ if (connection->agreed_pro_version < 91)
return -1091;

__drbd_uuid_set(device, UI_BITMAP, device->ldev->md.uuid[UI_HISTORY_START]);
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 4c7fee1..042bbc6 100644
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -454,7 +454,9 @@ static void drbd_report_io_error(struct drbd_device *device, struct drbd_request
int __req_mod(struct drbd_request *req, enum drbd_req_event what,
struct bio_and_error *m)
{
- struct drbd_device *device = req->device;
+ struct drbd_device *const device = req->device;
+ struct drbd_peer_device *const peer_device = first_peer_device(device);
+ struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
struct net_conf *nc;
int p, rv = 0;

@@ -477,7 +479,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
* and from w_read_retry_remote */
D_ASSERT(device, !(req->rq_state & RQ_NET_MASK));
rcu_read_lock();
- nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
+ nc = rcu_dereference(connection->net_conf);
p = nc->wire_protocol;
rcu_read_unlock();
req->rq_state |=
@@ -549,7 +551,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
D_ASSERT(device, (req->rq_state & RQ_LOCAL_MASK) == 0);
mod_rq_state(req, m, 0, RQ_NET_QUEUED);
req->w.cb = w_send_read_req;
- drbd_queue_work(&first_peer_device(device)->connection->sender_work,
+ drbd_queue_work(&connection->sender_work,
&req->w);
break;

@@ -585,23 +587,23 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
D_ASSERT(device, req->rq_state & RQ_NET_PENDING);
mod_rq_state(req, m, 0, RQ_NET_QUEUED|RQ_EXP_BARR_ACK);
req->w.cb = w_send_dblock;
- drbd_queue_work(&first_peer_device(device)->connection->sender_work,
+ drbd_queue_work(&connection->sender_work,
&req->w);

/* close the epoch, in case it outgrew the limit */
rcu_read_lock();
- nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
+ nc = rcu_dereference(connection->net_conf);
p = nc->max_epoch_size;
rcu_read_unlock();
- if (first_peer_device(device)->connection->current_tle_writes >= p)
- start_new_tl_epoch(first_peer_device(device)->connection);
+ if (connection->current_tle_writes >= p)
+ start_new_tl_epoch(connection);

break;

case QUEUE_FOR_SEND_OOS:
mod_rq_state(req, m, 0, RQ_NET_QUEUED);
req->w.cb = w_send_out_of_sync;
- drbd_queue_work(&first_peer_device(device)->connection->sender_work,
+ drbd_queue_work(&connection->sender_work,
&req->w);
break;

@@ -714,7 +716,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,

get_ldev(device); /* always succeeds in this call path */
req->w.cb = w_restart_disk_io;
- drbd_queue_work(&first_peer_device(device)->connection->sender_work,
+ drbd_queue_work(&connection->sender_work,
&req->w);
break;

@@ -736,7 +738,8 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,

mod_rq_state(req, m, RQ_COMPLETION_SUSP, RQ_NET_QUEUED|RQ_NET_PENDING);
if (req->w.cb) {
- drbd_queue_work(&first_peer_device(device)->connection->sender_work,
+ /* w.cb expected to be w_send_dblock, or w_send_read_req */
+ drbd_queue_work(&connection->sender_work,
&req->w);
rv = req->rq_state & RQ_WRITE ? MR_WRITE : MR_READ;
} /* else: FIXME can this happen? */
@@ -769,7 +772,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
break;

case QUEUE_AS_DRBD_BARRIER:
- start_new_tl_epoch(first_peer_device(device)->connection);
+ start_new_tl_epoch(connection);
mod_rq_state(req, m, 0, RQ_NET_OK|RQ_NET_DONE);
break;
};
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index a5d8aae..19da7c7 100644
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -952,6 +952,8 @@ 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;
@@ -978,9 +980,9 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
this happen...*/

if (is_valid_state(device, os) == rv)
- rv = is_valid_soft_transition(os, ns, first_peer_device(device)->connection);
+ rv = is_valid_soft_transition(os, ns, connection);
} else
- rv = is_valid_soft_transition(os, ns, first_peer_device(device)->connection);
+ rv = is_valid_soft_transition(os, ns, connection);
}

if (rv < SS_SUCCESS) {
@@ -997,7 +999,7 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
sanitize_state(). Only display it here if we where not called from
_conn_request_state() */
if (!(flags & CS_DC_SUSP))
- conn_pr_state_change(first_peer_device(device)->connection, os, ns,
+ 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
@@ -1017,19 +1019,19 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,

/* put replicated vs not-replicated requests in seperate epochs */
if (did_remote != should_do_remote)
- start_new_tl_epoch(first_peer_device(device)->connection);
+ 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(first_peer_device(device)->connection))
- clear_bit(STATE_SENT, &first_peer_device(device)->connection->flags);
+ no_peer_wf_report_params(connection))
+ clear_bit(STATE_SENT, &connection->flags);

wake_up(&device->misc_wait);
wake_up(&device->state_wait);
- wake_up(&first_peer_device(device)->connection->ping_wait);
+ wake_up(&connection->ping_wait);

/* Aborted verify run, or we reached the stop sector.
* Log the last position, unless end-of-device. */
@@ -1118,21 +1120,21 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,

/* Receiver should clean up itself */
if (os.conn != C_DISCONNECTING && ns.conn == C_DISCONNECTING)
- drbd_thread_stop_nowait(&first_peer_device(device)->connection->receiver);
+ 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(&first_peer_device(device)->connection->receiver);
+ 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(&first_peer_device(device)->connection->receiver);
+ 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);
- first_peer_device(device)->connection->connect_cnt++;
+ connection->connect_cnt++;
}

/* remember last attach time so request_timer_fn() won't
@@ -1150,7 +1152,7 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
ascw->w.cb = w_after_state_ch;
ascw->device = device;
ascw->done = done;
- drbd_queue_work(&first_peer_device(device)->connection->sender_work,
+ drbd_queue_work(&connection->sender_work,
&ascw->w);
} else {
drbd_err(device, "Could not kmalloc an ascw\n");
@@ -1222,6 +1224,8 @@ 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;
@@ -1245,7 +1249,6 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
state change. This function might sleep */

if (ns.susp_nod) {
- struct drbd_connection *connection = first_peer_device(device)->connection;
enum drbd_req_event what = NOTHING;

spin_lock_irq(&device->resource->req_lock);
@@ -1267,8 +1270,6 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
}

if (ns.susp_fen) {
- struct drbd_connection *connection = first_peer_device(device)->connection;
-
spin_lock_irq(&device->resource->req_lock);
if (resource->susp_fen && conn_lowest_conn(connection) >= C_CONNECTED) {
/* case2: The connection was established again: */
@@ -1294,8 +1295,8 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
* 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) &&
- first_peer_device(device)->connection->agreed_pro_version >= 96 && get_ldev(device)) {
- drbd_gen_and_send_sync_uuid(first_peer_device(device));
+ connection->agreed_pro_version >= 96 && get_ldev(device)) {
+ drbd_gen_and_send_sync_uuid(peer_device);
put_ldev(device);
}

@@ -1309,8 +1310,8 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
atomic_set(&device->rs_pending_cnt, 0);
drbd_rs_cancel_all(device);

- drbd_send_uuids(first_peer_device(device));
- drbd_send_state(first_peer_device(device), ns);
+ 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
@@ -1335,7 +1336,7 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
set_bit(NEW_CUR_UUID, &device->flags);
} else {
drbd_uuid_new_current(device);
- drbd_send_uuids(first_peer_device(device));
+ drbd_send_uuids(peer_device);
}
}
put_ldev(device);
@@ -1346,7 +1347,7 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
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(first_peer_device(device));
+ drbd_send_uuids(peer_device);
}
/* D_DISKLESS Peer becomes secondary */
if (os.peer == R_PRIMARY && ns.peer == R_SECONDARY)
@@ -1373,16 +1374,16 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
/* Last part of the attaching process ... */
if (ns.conn >= C_CONNECTED &&
os.disk == D_ATTACHING && ns.disk == D_NEGOTIATING) {
- drbd_send_sizes(first_peer_device(device), 0, 0); /* to start sync... */
- drbd_send_uuids(first_peer_device(device));
- drbd_send_state(first_peer_device(device), ns);
+ 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(first_peer_device(device), ns);
+ 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) &&
@@ -1392,10 +1393,10 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
/* 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(first_peer_device(device), ns);
+ drbd_send_state(peer_device, ns);

if (os.conn != C_AHEAD && ns.conn == C_AHEAD)
- drbd_send_state(first_peer_device(device), ns);
+ 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) ||
@@ -1449,7 +1450,7 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
drbd_disk_str(device->state.disk));

if (ns.conn >= C_CONNECTED)
- drbd_send_state(first_peer_device(device), ns);
+ drbd_send_state(peer_device, ns);

drbd_rs_cancel_all(device);

@@ -1473,7 +1474,7 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
drbd_disk_str(device->state.disk));

if (ns.conn >= C_CONNECTED)
- drbd_send_state(first_peer_device(device), ns);
+ drbd_send_state(peer_device, ns);
/* corresponding get_ldev in __drbd_set_state
* this may finally trigger drbd_ldev_destroy. */
put_ldev(device);
@@ -1481,7 +1482,7 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,

/* 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(first_peer_device(device), ns);
+ drbd_send_state(peer_device, ns);

/* Disks got bigger while they were detached */
if (ns.disk > D_NEGOTIATING && ns.pdsk > D_NEGOTIATING &&
@@ -1499,14 +1500,14 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
/* 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(first_peer_device(device), ns);
+ 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(first_peer_device(device), ns);
+ 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
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index d8f57b6..595ab57 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -583,8 +583,10 @@ static int drbd_rs_number_requests(struct drbd_device *device)
return number;
}

-static int make_resync_request(struct drbd_device *device, int cancel)
+static int make_resync_request(struct drbd_device *const device, int cancel)
{
+ struct drbd_peer_device *const peer_device = first_peer_device(device);
+ struct drbd_connection *const connection = peer_device ? peer_device->connection : NULL;
unsigned long bit;
sector_t sector;
const sector_t capacity = drbd_get_capacity(device->this_bdev);
@@ -618,15 +620,15 @@ static int make_resync_request(struct drbd_device *device, int cancel)

for (i = 0; i < number; i++) {
/* Stop generating RS requests, when half of the send buffer is filled */
- mutex_lock(&first_peer_device(device)->connection->data.mutex);
- if (first_peer_device(device)->connection->data.socket) {
- queued = first_peer_device(device)->connection->data.socket->sk->sk_wmem_queued;
- sndbuf = first_peer_device(device)->connection->data.socket->sk->sk_sndbuf;
+ mutex_lock(&connection->data.mutex);
+ if (connection->data.socket) {
+ queued = connection->data.socket->sk->sk_wmem_queued;
+ sndbuf = connection->data.socket->sk->sk_sndbuf;
} else {
queued = 1;
sndbuf = 0;
}
- mutex_unlock(&first_peer_device(device)->connection->data.mutex);
+ mutex_unlock(&connection->data.mutex);
if (queued > sndbuf / 2)
goto requeue;

@@ -696,9 +698,9 @@ next_sector:
/* adjust very last sectors, in case we are oddly sized */
if (sector + (size>>9) > capacity)
size = (capacity-sector)<<9;
- if (first_peer_device(device)->connection->agreed_pro_version >= 89 &&
- first_peer_device(device)->connection->csums_tfm) {
- switch (read_for_csum(first_peer_device(device), sector, size)) {
+ if (connection->agreed_pro_version >= 89 &&
+ connection->csums_tfm) {
+ switch (read_for_csum(peer_device, sector, size)) {
case -EIO: /* Disk failure */
put_ldev(device);
return -EIO;
@@ -717,7 +719,7 @@ next_sector:
int err;

inc_rs_pending(device);
- err = drbd_send_drequest(first_peer_device(device), P_RS_DATA_REQUEST,
+ err = drbd_send_drequest(peer_device, P_RS_DATA_REQUEST,
sector, size, ID_SYNCER);
if (err) {
drbd_err(device, "drbd_send_drequest() failed, aborting...\n");
@@ -1351,7 +1353,8 @@ int w_send_out_of_sync(struct drbd_work *w, int cancel)
{
struct drbd_request *req = container_of(w, struct drbd_request, w);
struct drbd_device *device = req->device;
- struct drbd_connection *connection = first_peer_device(device)->connection;
+ struct drbd_peer_device *const peer_device = first_peer_device(device);
+ struct drbd_connection *const connection = peer_device->connection;
int err;

if (unlikely(cancel)) {
@@ -1365,7 +1368,7 @@ int w_send_out_of_sync(struct drbd_work *w, int cancel)
* No more barriers will be sent, until we leave AHEAD mode again. */
maybe_send_barrier(connection, req->epoch);

- err = drbd_send_out_of_sync(first_peer_device(device), req);
+ err = drbd_send_out_of_sync(peer_device, req);
req_mod(req, OOS_HANDED_TO_NETWORK);

return err;
@@ -1380,7 +1383,8 @@ int w_send_dblock(struct drbd_work *w, int cancel)
{
struct drbd_request *req = container_of(w, struct drbd_request, w);
struct drbd_device *device = req->device;
- struct drbd_connection *connection = first_peer_device(device)->connection;
+ struct drbd_peer_device *const peer_device = first_peer_device(device);
+ struct drbd_connection *connection = peer_device->connection;
int err;

if (unlikely(cancel)) {
@@ -1392,7 +1396,7 @@ int w_send_dblock(struct drbd_work *w, int cancel)
maybe_send_barrier(connection, req->epoch);
connection->send.current_epoch_writes++;

- err = drbd_send_dblock(first_peer_device(device), req);
+ err = drbd_send_dblock(peer_device, req);
req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK);

return err;
@@ -1407,7 +1411,8 @@ int w_send_read_req(struct drbd_work *w, int cancel)
{
struct drbd_request *req = container_of(w, struct drbd_request, w);
struct drbd_device *device = req->device;
- struct drbd_connection *connection = first_peer_device(device)->connection;
+ struct drbd_peer_device *const peer_device = first_peer_device(device);
+ struct drbd_connection *connection = peer_device->connection;
int err;

if (unlikely(cancel)) {
@@ -1419,7 +1424,7 @@ int w_send_read_req(struct drbd_work *w, int cancel)
* if there was any yet. */
maybe_send_barrier(connection, req->epoch);

- err = drbd_send_drequest(first_peer_device(device), P_DATA_REQUEST, req->i.sector, req->i.size,
+ err = drbd_send_drequest(peer_device, P_DATA_REQUEST, req->i.sector, req->i.size,
(unsigned long)req);

req_mod(req, err ? SEND_FAILED : HANDED_OVER_TO_NETWORK);
@@ -1633,6 +1638,8 @@ int w_start_resync(struct drbd_work *w, int cancel)
*/
void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
{
+ struct drbd_peer_device *peer_device = first_peer_device(device);
+ struct drbd_connection *connection = peer_device ? peer_device->connection : NULL;
union drbd_state ns;
int r;

@@ -1651,7 +1658,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
if (r > 0) {
drbd_info(device, "before-resync-target handler returned %d, "
"dropping connection.\n", r);
- conn_request_state(first_peer_device(device)->connection, NS(conn, C_DISCONNECTING), CS_HARD);
+ conn_request_state(connection, NS(conn, C_DISCONNECTING), CS_HARD);
return;
}
} else /* C_SYNC_SOURCE */ {
@@ -1664,7 +1671,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
} else {
drbd_info(device, "before-resync-source handler returned %d, "
"dropping connection.\n", r);
- conn_request_state(first_peer_device(device)->connection,
+ conn_request_state(connection,
NS(conn, C_DISCONNECTING), CS_HARD);
return;
}
@@ -1672,7 +1679,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
}
}

- if (current == first_peer_device(device)->connection->worker.task) {
+ if (current == connection->worker.task) {
/* The worker should not sleep waiting for state_mutex,
that can take long */
if (!mutex_trylock(device->state_mutex)) {
@@ -1756,12 +1763,10 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
* drbd_resync_finished from here in that case.
* We drbd_gen_and_send_sync_uuid here for protocol < 96,
* and from after_state_ch otherwise. */
- if (side == C_SYNC_SOURCE &&
- first_peer_device(device)->connection->agreed_pro_version < 96)
- drbd_gen_and_send_sync_uuid(first_peer_device(device));
+ if (side == C_SYNC_SOURCE && connection->agreed_pro_version < 96)
+ drbd_gen_and_send_sync_uuid(peer_device);

- if (first_peer_device(device)->connection->agreed_pro_version < 95 &&
- device->rs_total == 0) {
+ if (connection->agreed_pro_version < 95 && device->rs_total == 0) {
/* This still has a race (about when exactly the peers
* detect connection loss) that can lead to a full sync
* on next handshake. In 8.3.9 we fixed this with explicit
@@ -1777,7 +1782,7 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
int timeo;

rcu_read_lock();
- nc = rcu_dereference(first_peer_device(device)->connection->net_conf);
+ nc = rcu_dereference(connection->net_conf);
timeo = nc->ping_int * HZ + nc->ping_timeo * HZ / 9;
rcu_read_unlock();
schedule_timeout_interruptible(timeo);
--
1.9.1

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