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drbd: Reworked the unconfiguring and thread stopping code 

* Moved CONFIG_PENDING and DEVICE_DYING from mdev to tconn.
* Renamed drbd_reconfig_start() and drbd_reconfig_done() to
  conn_reconfig_start() and conn_reconfig_done().

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-02-18 14:23:11 +01:00
parent c66342d949
commit 0e29d163f7
6 changed files with 80 additions and 70 deletions
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18
drivers/block/drbd/drbd_int.h
View File

@ -787,12 +787,6 @@ enum {
GO_DISKLESS, /* Disk is being detached, on io-error or admin request. */
WAS_IO_ERROR, /* Local disk failed returned IO error */
RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */
CONFIG_PENDING, /* serialization of (re)configuration requests.
* if set, also prevents the device from dying */
DEVICE_DYING, /* device became unconfigured,
* but worker thread is still handling the cleanup.
* reconfiguring (nl_disk_conf, nl_net_conf) is dissalowed,
* while this is set. */
RESIZE_PENDING, /* Size change detected locally, waiting for the response from
* the peer, if it changed there as well. */
CONN_DRY_RUN, /* Expect disconnect after resync handshake. */
@ -921,6 +915,12 @@ enum {
GOT_PING_ACK, /* set when we receive a ping_ack packet, ping_wait gets woken */
CONN_WD_ST_CHG_OKAY,
CONN_WD_ST_CHG_FAIL,
CONFIG_PENDING, /* serialization of (re)configuration requests.
* if set, also prevents the device from dying */
OBJECT_DYING, /* device became unconfigured,
* but worker thread is still handling the cleanup.
* reconfiguring (nl_disk_conf, nl_net_conf) is dissalowed,
* while this is set. */
};
struct drbd_tconn { /* is a resource from the config file */
@ -1574,7 +1574,11 @@ extern void _drbd_wait_ee_list_empty(struct drbd_conf *mdev,
struct list_head *head);
extern void drbd_set_recv_tcq(struct drbd_conf *mdev, int tcq_enabled);
extern void _drbd_clear_done_ee(struct drbd_conf *mdev, struct list_head *to_be_freed);
extern void drbd_flush_workqueue(struct drbd_conf *mdev);
extern void conn_flush_workqueue(struct drbd_tconn *tconn);
static inline void drbd_flush_workqueue(struct drbd_conf *mdev)
{
conn_flush_workqueue(mdev->tconn);
}
/* yes, there is kernel_setsockopt, but only since 2.6.18. we don't need to
* mess with get_fs/set_fs, we know we are KERNEL_DS always. */

40
drivers/block/drbd/drbd_nl.c
View File

@ -871,29 +871,27 @@ void drbd_reconsider_max_bio_size(struct drbd_conf *mdev)
* or start a new one. Flush any pending work, there may still be an
* after_state_change queued.
*/
static void drbd_reconfig_start(struct drbd_conf *mdev)
static void conn_reconfig_start(struct drbd_tconn *tconn)
{
wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
drbd_thread_start(&mdev->tconn->worker);
drbd_flush_workqueue(mdev);
wait_event(tconn->ping_wait, !test_and_set_bit(CONFIG_PENDING, &tconn->flags));
wait_event(tconn->ping_wait, !test_bit(OBJECT_DYING, &tconn->flags));
drbd_thread_start(&tconn->worker);
conn_flush_workqueue(tconn);
}
/* if still unconfigured, stops worker again.
* if configured now, clears CONFIG_PENDING.
* wakes potential waiters */
static void drbd_reconfig_done(struct drbd_conf *mdev)
static void conn_reconfig_done(struct drbd_tconn *tconn)
{
spin_lock_irq(&mdev->tconn->req_lock);
if (mdev->state.disk == D_DISKLESS &&
mdev->state.conn == C_STANDALONE &&
mdev->state.role == R_SECONDARY) {
set_bit(DEVICE_DYING, &mdev->flags);
drbd_thread_stop_nowait(&mdev->tconn->worker);
spin_lock_irq(&tconn->req_lock);
if (conn_all_vols_unconf(tconn)) {
set_bit(OBJECT_DYING, &tconn->flags);
drbd_thread_stop_nowait(&tconn->worker);
} else
clear_bit(CONFIG_PENDING, &mdev->flags);
spin_unlock_irq(&mdev->tconn->req_lock);
wake_up(&mdev->state_wait);
clear_bit(CONFIG_PENDING, &tconn->flags);
spin_unlock_irq(&tconn->req_lock);
wake_up(&tconn->ping_wait);
}
/* Make sure IO is suspended before calling this function(). */
@ -933,7 +931,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
enum drbd_state_rv rv;
int cp_discovered = 0;
drbd_reconfig_start(mdev);
conn_reconfig_start(mdev->tconn);
/* if you want to reconfigure, please tear down first */
if (mdev->state.disk > D_DISKLESS) {
@ -1279,7 +1277,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
put_ldev(mdev);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
conn_reconfig_done(mdev->tconn);
return 0;
force_diskless_dec:
@ -1300,7 +1298,7 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
lc_destroy(resync_lru);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
conn_reconfig_done(mdev->tconn);
return 0;
}
@ -1344,7 +1342,7 @@ static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
void *int_dig_vv = NULL;
struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
drbd_reconfig_start(mdev);
conn_reconfig_start(mdev->tconn);
if (mdev->state.conn > C_STANDALONE) {
retcode = ERR_NET_CONFIGURED;
@ -1530,7 +1528,7 @@ static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
conn_reconfig_done(mdev->tconn);
return 0;
fail:
@ -1543,7 +1541,7 @@ static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
kfree(new_conf);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
conn_reconfig_done(mdev->tconn);
return 0;
}

6
drivers/block/drbd/drbd_receiver.c
View File

@ -3932,14 +3932,14 @@ static void drbdd(struct drbd_tconn *tconn)
}
}
void drbd_flush_workqueue(struct drbd_conf *mdev)
void conn_flush_workqueue(struct drbd_tconn *tconn)
{
struct drbd_wq_barrier barr;
barr.w.cb = w_prev_work_done;
barr.w.mdev = mdev;
barr.w.tconn = tconn;
init_completion(&barr.done);
drbd_queue_work(&mdev->tconn->data.work, &barr.w);
drbd_queue_work(&tconn->data.work, &barr.w);
wait_for_completion(&barr.done);
}

54
drivers/block/drbd/drbd_state.c
View File

@ -41,13 +41,29 @@ extern void _tl_restart(struct drbd_conf *mdev, enum drbd_req_event what);
static int w_after_state_ch(struct drbd_work *w, int unused);
static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
union drbd_state ns, enum chg_state_flags flags);
static void after_all_state_ch(struct drbd_tconn *tconn, union drbd_state ns);
static void after_all_state_ch(struct drbd_tconn *tconn);
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);
int conn_all_vols_unconf(struct drbd_tconn *tconn)
{
struct drbd_conf *mdev;
int minor, uncfg = 1;
idr_for_each_entry(&tconn->volumes, mdev, minor) {
uncfg &= (mdev->state.disk == D_DISKLESS &&
mdev->state.conn == C_STANDALONE &&
mdev->state.role == R_SECONDARY);
if (!uncfg)
break;
}
return uncfg;
}
/**
* cl_wide_st_chg() - true if the state change is a cluster wide one
* @mdev: DRBD device.
@ -744,20 +760,6 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
print_state_change(mdev, os, ns, flags);
/* solve the race between becoming unconfigured,
* worker doing the cleanup, and
* admin reconfiguring us:
* on (re)configure, first set CONFIG_PENDING,
* then wait for a potentially exiting worker,
* start the worker, and schedule one no_op.
* then proceed with configuration.
*/
if (ns.disk == D_DISKLESS &&
ns.conn == C_STANDALONE &&
ns.role == R_SECONDARY &&
!test_and_set_bit(CONFIG_PENDING, &mdev->flags))
set_bit(DEVICE_DYING, &mdev->flags);
/* if we are going -> D_FAILED or D_DISKLESS, grab one extra reference
* on the ldev here, to be sure the transition -> D_DISKLESS resp.
* drbd_ldev_destroy() won't happen before our corresponding
@ -768,6 +770,18 @@ __drbd_set_state(struct drbd_conf *mdev, union drbd_state ns,
mdev->state = ns;
/* 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(conn_all_vols_unconf(mdev->tconn) &&
!test_and_set_bit(CONFIG_PENDING, &mdev->tconn->flags))
set_bit(OBJECT_DYING, &mdev->tconn->flags);
if (os.disk == D_ATTACHING && ns.disk >= D_NEGOTIATING)
drbd_print_uuids(mdev, "attached to UUIDs");
@ -1236,7 +1250,7 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
resume_next_sg(mdev);
}
after_all_state_ch(mdev->tconn, ns);
after_all_state_ch(mdev->tconn);
drbd_md_sync(mdev);
}
@ -1248,10 +1262,10 @@ struct after_conn_state_chg_work {
enum chg_state_flags flags;
};
static void after_all_state_ch(struct drbd_tconn *tconn, union drbd_state ns)
static void after_all_state_ch(struct drbd_tconn *tconn)
{
if (ns.disk == D_DISKLESS && ns.conn == C_STANDALONE && ns.role == R_SECONDARY) {
/* if (test_bit(DEVICE_DYING, &mdev->flags)) TODO: DEVICE_DYING functionality */
if (conn_all_vols_unconf(tconn) &&
test_bit(OBJECT_DYING, &tconn->flags)) {
drbd_thread_stop_nowait(&tconn->worker);
}
}
@ -1271,7 +1285,7 @@ static int w_after_conn_state_ch(struct drbd_work *w, int unused)
drbd_thread_start(&tconn->receiver);
//conn_err(tconn, STATE_FMT, STATE_ARGS("nms", nms));
after_all_state_ch(tconn, nms);
after_all_state_ch(tconn);
return 1;
}

1
drivers/block/drbd/drbd_state.h
View File

@ -91,6 +91,7 @@ conn_request_state(struct drbd_tconn *tconn, union drbd_state mask, union drbd_s
enum chg_state_flags flags);
extern void drbd_resume_al(struct drbd_conf *mdev);
extern int conn_all_vols_unconf(struct drbd_tconn *tconn);
/**
* drbd_request_state() - Reqest a state change

31
drivers/block/drbd/drbd_worker.c
View File

@ -1643,29 +1643,13 @@ void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side)
mutex_unlock(mdev->state_mutex);
}
static int _worker_dying(int vnr, void *p, void *data)
{
struct drbd_conf *mdev = (struct drbd_conf *)p;
D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE);
/* _drbd_set_state only uses stop_nowait.
* wait here for the exiting receiver. */
drbd_thread_stop(&mdev->tconn->receiver);
drbd_mdev_cleanup(mdev);
clear_bit(DEVICE_DYING, &mdev->flags);
clear_bit(CONFIG_PENDING, &mdev->flags);
wake_up(&mdev->state_wait);
return 0;
}
int drbd_worker(struct drbd_thread *thi)
{
struct drbd_tconn *tconn = thi->tconn;
struct drbd_work *w = NULL;
struct drbd_conf *mdev;
LIST_HEAD(work_list);
int intr = 0;
int minor, intr = 0;
while (get_t_state(thi) == RUNNING) {
drbd_thread_current_set_cpu(thi);
@ -1749,7 +1733,16 @@ int drbd_worker(struct drbd_thread *thi)
*/
spin_unlock_irq(&tconn->data.work.q_lock);
idr_for_each(&tconn->volumes, _worker_dying, NULL);
drbd_thread_stop(&tconn->receiver);
idr_for_each_entry(&tconn->volumes, mdev, minor) {
D_ASSERT(mdev->state.disk == D_DISKLESS && mdev->state.conn == C_STANDALONE);
/* _drbd_set_state only uses stop_nowait.
* wait here for the exiting receiver. */
drbd_mdev_cleanup(mdev);
}
clear_bit(OBJECT_DYING, &tconn->flags);
clear_bit(CONFIG_PENDING, &tconn->flags);
wake_up(&tconn->ping_wait);
return 0;
}