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drbd: Converted drbd_try_outdate_peer() from mdev to tconn 

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 2011-03-24 11:03:07 +01:00
parent a02d124091
commit cb703454a2
6 changed files with 156 additions and 100 deletions
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4
drivers/block/drbd/drbd_int.h
View File

@ -1472,8 +1472,8 @@ extern void drbd_reconsider_max_bio_size(struct drbd_conf *mdev);
extern enum drbd_state_rv drbd_set_role(struct drbd_conf *mdev,
enum drbd_role new_role,
int force);
extern enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev);
extern void drbd_try_outdate_peer_async(struct drbd_conf *mdev);
extern bool conn_try_outdate_peer(struct drbd_tconn *tconn);
extern void conn_try_outdate_peer_async(struct drbd_tconn *tconn);
extern int drbd_khelper(struct drbd_conf *mdev, char *cmd);
/* drbd_worker.c */

152
drivers/block/drbd/drbd_nl.c
View File

@ -366,116 +366,122 @@ int conn_khelper(struct drbd_tconn *tconn, char *cmd)
return ret;
}
enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
{
char *ex_to_string;
int r;
enum drbd_disk_state nps;
enum drbd_fencing_p fp;
enum drbd_fencing_p fp = FP_NOT_AVAIL;
struct drbd_conf *mdev;
int vnr;
D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
if (get_ldev_if_state(mdev, D_CONSISTENT)) {
fp = mdev->ldev->dc.fencing;
put_ldev(mdev);
} else {
dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
nps = mdev->state.pdsk;
goto out;
idr_for_each_entry(&tconn->volumes, mdev, vnr) {
if (get_ldev_if_state(mdev, D_CONSISTENT)) {
fp = max_t(enum drbd_fencing_p, fp, mdev->ldev->dc.fencing);
put_ldev(mdev);
}
}
r = drbd_khelper(mdev, "fence-peer");
return fp;
}
bool conn_try_outdate_peer(struct drbd_tconn *tconn)
{
union drbd_state mask = { };
union drbd_state val = { };
enum drbd_fencing_p fp;
char *ex_to_string;
int r;
if (tconn->cstate >= C_WF_REPORT_PARAMS) {
conn_err(tconn, "Expected cstate < C_WF_REPORT_PARAMS\n");
return false;
}
fp = highest_fencing_policy(tconn);
switch (fp) {
case FP_NOT_AVAIL:
conn_warn(tconn, "Not fencing peer, I'm not even Consistent myself.\n");
goto out;
case FP_DONT_CARE:
return true;
default: ;
}
r = conn_khelper(tconn, "fence-peer");
switch ((r>>8) & 0xff) {
case 3: /* peer is inconsistent */
ex_to_string = "peer is inconsistent or worse";
nps = D_INCONSISTENT;
mask.pdsk = D_MASK;
val.pdsk = D_INCONSISTENT;
break;
case 4: /* peer got outdated, or was already outdated */
ex_to_string = "peer was fenced";
nps = D_OUTDATED;
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
break;
case 5: /* peer was down */
if (mdev->state.disk == D_UP_TO_DATE) {
if (conn_highest_disk(tconn) == D_UP_TO_DATE) {
/* we will(have) create(d) a new UUID anyways... */
ex_to_string = "peer is unreachable, assumed to be dead";
nps = D_OUTDATED;
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
} else {
ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
nps = mdev->state.pdsk;
}
break;
case 6: /* Peer is primary, voluntarily outdate myself.
* This is useful when an unconnected R_SECONDARY is asked to
* become R_PRIMARY, but finds the other peer being active. */
ex_to_string = "peer is active";
dev_warn(DEV, "Peer is primary, outdating myself.\n");
nps = D_UNKNOWN;
_drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
conn_warn(tconn, "Peer is primary, outdating myself.\n");
mask.disk = D_MASK;
val.disk = D_OUTDATED;
break;
case 7:
if (fp != FP_STONITH)
dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
conn_err(tconn, "fence-peer() = 7 && fencing != Stonith !!!\n");
ex_to_string = "peer was stonithed";
nps = D_OUTDATED;
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
break;
default:
/* The script is broken ... */
nps = D_UNKNOWN;
dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
return nps;
conn_err(tconn, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
return false; /* Eventually leave IO frozen */
}
dev_info(DEV, "fence-peer helper returned %d (%s)\n",
(r>>8) & 0xff, ex_to_string);
conn_info(tconn, "fence-peer helper returned %d (%s)\n",
(r>>8) & 0xff, ex_to_string);
out:
if (mdev->state.susp_fen && nps >= D_UNKNOWN) {
/* The handler was not successful... unfreeze here, the
state engine can not unfreeze... */
_drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE);
}
out:
return nps;
/* Not using
conn_request_state(tconn, mask, val, CS_VERBOSE);
here, because we might were able to re-establish the connection in the
meantime. */
spin_lock_irq(&tconn->req_lock);
if (tconn->cstate < C_WF_REPORT_PARAMS)
_conn_request_state(tconn, mask, val, CS_VERBOSE);
spin_unlock_irq(&tconn->req_lock);
return conn_highest_pdsk(tconn) <= D_OUTDATED;
}
static int _try_outdate_peer_async(void *data)
{
struct drbd_conf *mdev = (struct drbd_conf *)data;
enum drbd_disk_state nps;
union drbd_state ns;
struct drbd_tconn *tconn = (struct drbd_tconn *)data;
nps = drbd_try_outdate_peer(mdev);
/* Not using
drbd_request_state(mdev, NS(pdsk, nps));
here, because we might were able to re-establish the connection
in the meantime. This can only partially be solved in the state's
engine is_valid_state() and is_valid_state_transition()
functions.
nps can be D_INCONSISTENT, D_OUTDATED or D_UNKNOWN.
pdsk == D_INCONSISTENT while conn >= C_CONNECTED is valid,
therefore we have to have the pre state change check here.
*/
spin_lock_irq(&mdev->tconn->req_lock);
ns = mdev->state;
if (ns.conn < C_WF_REPORT_PARAMS) {
ns.pdsk = nps;
_drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
}
spin_unlock_irq(&mdev->tconn->req_lock);
conn_try_outdate_peer(tconn);
return 0;
}
void drbd_try_outdate_peer_async(struct drbd_conf *mdev)
void conn_try_outdate_peer_async(struct drbd_tconn *tconn)
{
struct task_struct *opa;
opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev));
opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
if (IS_ERR(opa))
dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n");
conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
}
enum drbd_state_rv
@ -486,7 +492,6 @@ drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
int try = 0;
int forced = 0;
union drbd_state mask, val;
enum drbd_disk_state nps;
if (new_role == R_PRIMARY)
request_ping(mdev->tconn); /* Detect a dead peer ASAP */
@ -519,32 +524,23 @@ drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
if (rv == SS_NO_UP_TO_DATE_DISK &&
mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
nps = drbd_try_outdate_peer(mdev);
if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
if (conn_try_outdate_peer(mdev->tconn)) {
val.disk = D_UP_TO_DATE;
mask.disk = D_MASK;
}
val.pdsk = nps;
mask.pdsk = D_MASK;
continue;
}
if (rv == SS_NOTHING_TO_DO)
goto out;
if (rv == SS_PRIMARY_NOP && mask.pdsk == 0) {
nps = drbd_try_outdate_peer(mdev);
if (force && nps > D_OUTDATED) {
if (!conn_try_outdate_peer(mdev->tconn) && force) {
dev_warn(DEV, "Forced into split brain situation!\n");
nps = D_OUTDATED;
mask.pdsk = D_MASK;
val.pdsk = D_OUTDATED;
}
mask.pdsk = D_MASK;
val.pdsk = nps;
continue;
}
if (rv == SS_TWO_PRIMARIES) {

7
drivers/block/drbd/drbd_receiver.c
View File

@ -4030,9 +4030,11 @@ static void drbd_disconnect(struct drbd_tconn *tconn)
drbd_free_sock(tconn);
idr_for_each(&tconn->volumes, drbd_disconnected, tconn);
conn_info(tconn, "Connection closed\n");
if (conn_highest_role(tconn) == R_PRIMARY && conn_highest_pdsk(tconn) >= D_UNKNOWN)
conn_try_outdate_peer_async(tconn);
spin_lock_irq(&tconn->req_lock);
oc = tconn->cstate;
if (oc >= C_UNCONNECTED)
@ -4109,9 +4111,6 @@ static int drbd_disconnected(int vnr, void *p, void *data)
put_ldev(mdev);
}
if (mdev->state.role == R_PRIMARY && fp >= FP_RESOURCE && mdev->state.pdsk >= D_UNKNOWN)
drbd_try_outdate_peer_async(mdev);
/* serialize with bitmap writeout triggered by the state change,
* if any. */
wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags));

85
drivers/block/drbd/drbd_state.c
View File

@ -61,6 +61,73 @@ bool conn_all_vols_unconf(struct drbd_tconn *tconn)
return true;
}
/* 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_tconn *tconn)
{
enum drbd_role role = R_UNKNOWN;
struct drbd_conf *mdev;
int vnr;
idr_for_each_entry(&tconn->volumes, mdev, vnr)
role = max_role(role, mdev->state.role);
return role;
}
enum drbd_role conn_highest_peer(struct drbd_tconn *tconn)
{
enum drbd_role peer = R_UNKNOWN;
struct drbd_conf *mdev;
int vnr;
idr_for_each_entry(&tconn->volumes, mdev, vnr)
peer = max_role(peer, mdev->state.peer);
return peer;
}
enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn)
{
enum drbd_disk_state ds = D_DISKLESS;
struct drbd_conf *mdev;
int vnr;
idr_for_each_entry(&tconn->volumes, mdev, vnr)
ds = max_t(enum drbd_disk_state, ds, mdev->state.disk);
return ds;
}
enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn)
{
enum drbd_disk_state ds = D_DISKLESS;
struct drbd_conf *mdev;
int vnr;
idr_for_each_entry(&tconn->volumes, mdev, vnr)
ds = max_t(enum drbd_disk_state, ds, mdev->state.pdsk);
return ds;
}
/**
* cl_wide_st_chg() - true if the state change is a cluster wide one
* @mdev: DRBD device.
@ -329,18 +396,6 @@ static void print_state_change(struct drbd_conf *mdev, union drbd_state os, unio
dev_info(DEV, "%s\n", pb);
}
static bool vol_has_primary_peer(struct drbd_tconn *tconn)
{
struct drbd_conf *mdev;
int vnr;
idr_for_each_entry(&tconn->volumes, mdev, vnr) {
if (mdev->state.peer == R_PRIMARY)
return true;
}
return false;
}
/**
* is_valid_state() - Returns an SS_ error code if ns is not valid
* @mdev: DRBD device.
@ -364,7 +419,7 @@ is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
if (!mdev->tconn->net_conf->two_primaries && ns.role == R_PRIMARY) {
if (ns.peer == R_PRIMARY)
rv = SS_TWO_PRIMARIES;
else if (vol_has_primary_peer(mdev->tconn))
else if (conn_highest_peer(mdev->tconn) == R_PRIMARY)
rv = SS_O_VOL_PEER_PRI;
}
put_net_conf(mdev->tconn);
@ -1390,8 +1445,8 @@ static int _set_state_itr_fn(int vnr, void *p, void *data)
rv = __drbd_set_state(mdev, ns, flags, NULL);
ms.role = max_t(enum drbd_role, mdev->state.role, ms.role);
ms.peer = max_t(enum drbd_role, mdev->state.peer, ms.peer);
ms.role = max_role(ns.role, ms.role);
ms.peer = max_role(ns.peer, ms.peer);
ms.disk = max_t(enum drbd_role, mdev->state.disk, ms.disk);
ms.pdsk = max_t(enum drbd_role, mdev->state.pdsk, ms.pdsk);
params->ms = ms;

5
drivers/block/drbd/drbd_state.h
View File

@ -110,4 +110,9 @@ static inline int drbd_request_state(struct drbd_conf *mdev,
return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED);
}
enum drbd_role conn_highest_role(struct drbd_tconn *tconn);
enum drbd_role conn_highest_peer(struct drbd_tconn *tconn);
enum drbd_disk_state conn_highest_disk(struct drbd_tconn *tconn);
enum drbd_disk_state conn_highest_pdsk(struct drbd_tconn *tconn);
#endif

3
include/linux/drbd.h
View File

@ -65,7 +65,8 @@ enum drbd_io_error_p {
};
enum drbd_fencing_p {
FP_DONT_CARE,
FP_NOT_AVAIL = -1, /* Not a policy */
FP_DONT_CARE = 0,
FP_RESOURCE,
FP_STONITH
};