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ocfs2: dlm_remaster_locks() should never exit without completing
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We cannot restart recovery. Once we begin to recover a node, keep the state
of the recovery intact and follow through, regardless of any other node
deaths that may occur.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
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Kurt Hackel authored and Mark Fasheh committed Jun 26, 2006
1 parent c8df412 commit 6a41321
Showing 1 changed file with 62 additions and 54 deletions.
116 changes: 62 additions & 54 deletions fs/ocfs2/dlm/dlmrecovery.c
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Original file line number Diff line number Diff line change
Expand Up @@ -480,6 +480,7 @@ static int dlm_do_recovery(struct dlm_ctxt *dlm)

status = dlm_remaster_locks(dlm, dlm->reco.dead_node);
if (status < 0) {
/* we should never hit this anymore */
mlog(ML_ERROR, "error %d remastering locks for node %u, "
"retrying.\n", status, dlm->reco.dead_node);
/* yield a bit to allow any final network messages
Expand All @@ -506,9 +507,16 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
int destroy = 0;
int pass = 0;

status = dlm_init_recovery_area(dlm, dead_node);
if (status < 0)
goto leave;
do {
/* we have become recovery master. there is no escaping
* this, so just keep trying until we get it. */
status = dlm_init_recovery_area(dlm, dead_node);
if (status < 0) {
mlog(ML_ERROR, "%s: failed to alloc recovery area, "
"retrying\n", dlm->name);
msleep(1000);
}
} while (status != 0);

/* safe to access the node data list without a lock, since this
* process is the only one to change the list */
Expand All @@ -525,16 +533,36 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
continue;
}

status = dlm_request_all_locks(dlm, ndata->node_num, dead_node);
if (status < 0) {
mlog_errno(status);
if (dlm_is_host_down(status))
ndata->state = DLM_RECO_NODE_DATA_DEAD;
else {
destroy = 1;
goto leave;
do {
status = dlm_request_all_locks(dlm, ndata->node_num,
dead_node);
if (status < 0) {
mlog_errno(status);
if (dlm_is_host_down(status)) {
/* node died, ignore it for recovery */
status = 0;
ndata->state = DLM_RECO_NODE_DATA_DEAD;
/* wait for the domain map to catch up
* with the network state. */
wait_event_timeout(dlm->dlm_reco_thread_wq,
dlm_is_node_dead(dlm,
ndata->node_num),
msecs_to_jiffies(1000));
mlog(0, "waited 1 sec for %u, "
"dead? %s\n", ndata->node_num,
dlm_is_node_dead(dlm, ndata->node_num) ?
"yes" : "no");
} else {
/* -ENOMEM on the other node */
mlog(0, "%s: node %u returned "
"%d during recovery, retrying "
"after a short wait\n",
dlm->name, ndata->node_num,
status);
msleep(100);
}
}
}
} while (status != 0);

switch (ndata->state) {
case DLM_RECO_NODE_DATA_INIT:
Expand All @@ -546,10 +574,9 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
mlog(0, "node %u died after requesting "
"recovery info for node %u\n",
ndata->node_num, dead_node);
// start all over
destroy = 1;
status = -EAGAIN;
goto leave;
/* fine. don't need this node's info.
* continue without it. */
break;
case DLM_RECO_NODE_DATA_REQUESTING:
ndata->state = DLM_RECO_NODE_DATA_REQUESTED;
mlog(0, "now receiving recovery data from "
Expand Down Expand Up @@ -593,28 +620,12 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
BUG();
break;
case DLM_RECO_NODE_DATA_DEAD:
mlog(ML_NOTICE, "node %u died after "
mlog(0, "node %u died after "
"requesting recovery info for "
"node %u\n", ndata->node_num,
dead_node);
spin_unlock(&dlm_reco_state_lock);
// start all over
destroy = 1;
status = -EAGAIN;
/* instead of spinning like crazy here,
* wait for the domain map to catch up
* with the network state. otherwise this
* can be hit hundreds of times before
* the node is really seen as dead. */
wait_event_timeout(dlm->dlm_reco_thread_wq,
dlm_is_node_dead(dlm,
ndata->node_num),
msecs_to_jiffies(1000));
mlog(0, "waited 1 sec for %u, "
"dead? %s\n", ndata->node_num,
dlm_is_node_dead(dlm, ndata->node_num) ?
"yes" : "no");
goto leave;
break;
case DLM_RECO_NODE_DATA_RECEIVING:
case DLM_RECO_NODE_DATA_REQUESTED:
mlog(0, "%s: node %u still in state %s\n",
Expand Down Expand Up @@ -659,7 +670,7 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
jiffies, dlm->reco.dead_node,
dlm->node_num, dlm->reco.new_master);
destroy = 1;
status = ret;
status = 0;
/* rescan everything marked dirty along the way */
dlm_kick_thread(dlm, NULL);
break;
Expand All @@ -672,7 +683,6 @@ static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)

}

leave:
if (destroy)
dlm_destroy_recovery_area(dlm, dead_node);

Expand Down Expand Up @@ -832,24 +842,22 @@ static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)

if (dead_node != dlm->reco.dead_node ||
reco_master != dlm->reco.new_master) {
/* show extra debug info if the recovery state is messed */
mlog(ML_ERROR, "%s: bad reco state: reco(dead=%u, master=%u), "
"request(dead=%u, master=%u)\n",
dlm->name, dlm->reco.dead_node, dlm->reco.new_master,
dead_node, reco_master);
mlog(ML_ERROR, "%s: name=%.*s master=%u locks=%u/%u flags=%u "
"entry[0]={c=%u:%llu,l=%u,f=%u,t=%d,ct=%d,hb=%d,n=%u}\n",
dlm->name, mres->lockname_len, mres->lockname, mres->master,
mres->num_locks, mres->total_locks, mres->flags,
dlm_get_lock_cookie_node(mres->ml[0].cookie),
dlm_get_lock_cookie_seq(mres->ml[0].cookie),
mres->ml[0].list, mres->ml[0].flags,
mres->ml[0].type, mres->ml[0].convert_type,
mres->ml[0].highest_blocked, mres->ml[0].node);
BUG();
/* worker could have been created before the recovery master
* died. if so, do not continue, but do not error. */
if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
mlog(ML_NOTICE, "%s: will not send recovery state, "
"recovery master %u died, thread=(dead=%u,mas=%u)"
" current=(dead=%u,mas=%u)\n", dlm->name,
reco_master, dead_node, reco_master,
dlm->reco.dead_node, dlm->reco.new_master);
} else {
mlog(ML_NOTICE, "%s: reco state invalid: reco(dead=%u, "
"master=%u), request(dead=%u, master=%u)\n",
dlm->name, dlm->reco.dead_node,
dlm->reco.new_master, dead_node, reco_master);
}
goto leave;
}
BUG_ON(dead_node != dlm->reco.dead_node);
BUG_ON(reco_master != dlm->reco.new_master);

/* lock resources should have already been moved to the
* dlm->reco.resources list. now move items from that list
Expand Down Expand Up @@ -889,7 +897,7 @@ static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
dlm->name, reco_master, dead_node, ret);
}
}

leave:
free_page((unsigned long)data);
}

Expand Down

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