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authorKurt Hackel <kurt.hackel@oracle.com>2006-05-01 11:49:52 -0700
committerMark Fasheh <mark.fasheh@oracle.com>2006-06-26 14:43:03 -0700
commite7e69eb38946ebef86e27442d01514fcf9c854ee (patch)
treea17cfb1edba8e3c897778808eec641a97c51005c /fs
parente4eb03681a8313168d99c2f93175331a898a2c16 (diff)
ocfs2: teach dlm_restart_lock_mastery() to wait on recovery
Change behavior of dlm_restart_lock_mastery() when a node goes down. Dump all responses that have been collected and start over. Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/ocfs2/dlm/dlmmaster.c100
1 files changed, 44 insertions, 56 deletions
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index e5d7271d503..915283fb48c 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -867,6 +867,7 @@ lookup:
spin_unlock(&dlm->master_lock);
spin_unlock(&dlm->spinlock);
+redo_request:
while (wait_on_recovery) {
/* any cluster changes that occurred after dropping the
* dlm spinlock would be detectable be a change on the mle,
@@ -904,7 +905,6 @@ lookup:
if (blocked)
goto wait;
-redo_request:
ret = -EINVAL;
dlm_node_iter_init(mle->vote_map, &iter);
while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
@@ -929,6 +929,7 @@ wait:
/* keep going until the response map includes all nodes */
ret = dlm_wait_for_lock_mastery(dlm, res, mle, &blocked);
if (ret < 0) {
+ wait_on_recovery = 1;
mlog(0, "%s:%.*s: node map changed, redo the "
"master request now, blocked=%d\n",
dlm->name, res->lockname.len,
@@ -1210,18 +1211,6 @@ static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm,
set_bit(node, mle->vote_map);
} else {
mlog(ML_ERROR, "node down! %d\n", node);
-
- /* if the node wasn't involved in mastery skip it,
- * but clear it out from the maps so that it will
- * not affect mastery of this lockres */
- clear_bit(node, mle->response_map);
- clear_bit(node, mle->vote_map);
- if (!test_bit(node, mle->maybe_map))
- goto next;
-
- /* if we're already blocked on lock mastery, and the
- * dead node wasn't the expected master, or there is
- * another node in the maybe_map, keep waiting */
if (blocked) {
int lowest = find_next_bit(mle->maybe_map,
O2NM_MAX_NODES, 0);
@@ -1229,54 +1218,53 @@ static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm,
/* act like it was never there */
clear_bit(node, mle->maybe_map);
- if (node != lowest)
- goto next;
-
- mlog(ML_ERROR, "expected master %u died while "
- "this node was blocked waiting on it!\n",
- node);
- lowest = find_next_bit(mle->maybe_map,
- O2NM_MAX_NODES,
- lowest+1);
- if (lowest < O2NM_MAX_NODES) {
- mlog(0, "still blocked. waiting "
- "on %u now\n", lowest);
- goto next;
+ if (node == lowest) {
+ mlog(0, "expected master %u died"
+ " while this node was blocked "
+ "waiting on it!\n", node);
+ lowest = find_next_bit(mle->maybe_map,
+ O2NM_MAX_NODES,
+ lowest+1);
+ if (lowest < O2NM_MAX_NODES) {
+ mlog(0, "%s:%.*s:still "
+ "blocked. waiting on %u "
+ "now\n", dlm->name,
+ res->lockname.len,
+ res->lockname.name,
+ lowest);
+ } else {
+ /* mle is an MLE_BLOCK, but
+ * there is now nothing left to
+ * block on. we need to return
+ * all the way back out and try
+ * again with an MLE_MASTER.
+ * dlm_do_local_recovery_cleanup
+ * has already run, so the mle
+ * refcount is ok */
+ mlog(0, "%s:%.*s: no "
+ "longer blocking. try to "
+ "master this here\n",
+ dlm->name,
+ res->lockname.len,
+ res->lockname.name);
+ mle->type = DLM_MLE_MASTER;
+ mle->u.res = res;
+ }
}
-
- /* mle is an MLE_BLOCK, but there is now
- * nothing left to block on. we need to return
- * all the way back out and try again with
- * an MLE_MASTER. dlm_do_local_recovery_cleanup
- * has already run, so the mle refcount is ok */
- mlog(0, "no longer blocking. we can "
- "try to master this here\n");
- mle->type = DLM_MLE_MASTER;
- memset(mle->maybe_map, 0,
- sizeof(mle->maybe_map));
- memset(mle->response_map, 0,
- sizeof(mle->maybe_map));
- memcpy(mle->vote_map, mle->node_map,
- sizeof(mle->node_map));
- mle->u.res = res;
- set_bit(dlm->node_num, mle->maybe_map);
-
- ret = -EAGAIN;
- goto next;
}
- clear_bit(node, mle->maybe_map);
- if (node > dlm->node_num)
- goto next;
-
- mlog(0, "dead node in map!\n");
- /* yuck. go back and re-contact all nodes
- * in the vote_map, removing this node. */
- memset(mle->response_map, 0,
- sizeof(mle->response_map));
+ /* now blank out everything, as if we had never
+ * contacted anyone */
+ memset(mle->maybe_map, 0, sizeof(mle->maybe_map));
+ memset(mle->response_map, 0, sizeof(mle->response_map));
+ /* reset the vote_map to the current node_map */
+ memcpy(mle->vote_map, mle->node_map,
+ sizeof(mle->node_map));
+ /* put myself into the maybe map */
+ if (mle->type != DLM_MLE_BLOCK)
+ set_bit(dlm->node_num, mle->maybe_map);
}
ret = -EAGAIN;
-next:
node = dlm_bitmap_diff_iter_next(&bdi, &sc);
}
return ret;