dlm: add node slots and generation
Slot numbers are assigned to nodes when they join the lockspace.
The slot number chosen is the minimum unused value starting at 1.
Once a node is assigned a slot, that slot number will not change
while the node remains a lockspace member. If the node leaves
and rejoins it can be assigned a new slot number.
A new generation number is also added to a lockspace. It is
set and incremented during each recovery along with the slot
collection/assignment.
The slot numbers will be passed to gfs2 which will use them as
journal id's.
Signed-off-by: David Teigland <teigland@redhat.com>
diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c
index 81b2393..34d5adf1f 100644
--- a/fs/dlm/recover.c
+++ b/fs/dlm/recover.c
@@ -85,14 +85,20 @@
return status;
}
+static void _set_recover_status(struct dlm_ls *ls, uint32_t status)
+{
+ ls->ls_recover_status |= status;
+}
+
void dlm_set_recover_status(struct dlm_ls *ls, uint32_t status)
{
spin_lock(&ls->ls_recover_lock);
- ls->ls_recover_status |= status;
+ _set_recover_status(ls, status);
spin_unlock(&ls->ls_recover_lock);
}
-static int wait_status_all(struct dlm_ls *ls, uint32_t wait_status)
+static int wait_status_all(struct dlm_ls *ls, uint32_t wait_status,
+ int save_slots)
{
struct dlm_rcom *rc = ls->ls_recover_buf;
struct dlm_member *memb;
@@ -106,10 +112,13 @@
goto out;
}
- error = dlm_rcom_status(ls, memb->nodeid);
+ error = dlm_rcom_status(ls, memb->nodeid, 0);
if (error)
goto out;
+ if (save_slots)
+ dlm_slot_save(ls, rc, memb);
+
if (rc->rc_result & wait_status)
break;
if (delay < 1000)
@@ -121,7 +130,8 @@
return error;
}
-static int wait_status_low(struct dlm_ls *ls, uint32_t wait_status)
+static int wait_status_low(struct dlm_ls *ls, uint32_t wait_status,
+ uint32_t status_flags)
{
struct dlm_rcom *rc = ls->ls_recover_buf;
int error = 0, delay = 0, nodeid = ls->ls_low_nodeid;
@@ -132,7 +142,7 @@
goto out;
}
- error = dlm_rcom_status(ls, nodeid);
+ error = dlm_rcom_status(ls, nodeid, status_flags);
if (error)
break;
@@ -152,18 +162,56 @@
int error;
if (ls->ls_low_nodeid == dlm_our_nodeid()) {
- error = wait_status_all(ls, status);
+ error = wait_status_all(ls, status, 0);
if (!error)
dlm_set_recover_status(ls, status_all);
} else
- error = wait_status_low(ls, status_all);
+ error = wait_status_low(ls, status_all, 0);
return error;
}
int dlm_recover_members_wait(struct dlm_ls *ls)
{
- return wait_status(ls, DLM_RS_NODES);
+ struct dlm_member *memb;
+ struct dlm_slot *slots;
+ int num_slots, slots_size;
+ int error, rv;
+ uint32_t gen;
+
+ list_for_each_entry(memb, &ls->ls_nodes, list) {
+ memb->slot = -1;
+ memb->generation = 0;
+ }
+
+ if (ls->ls_low_nodeid == dlm_our_nodeid()) {
+ error = wait_status_all(ls, DLM_RS_NODES, 1);
+ if (error)
+ goto out;
+
+ /* slots array is sparse, slots_size may be > num_slots */
+
+ rv = dlm_slots_assign(ls, &num_slots, &slots_size, &slots, &gen);
+ if (!rv) {
+ spin_lock(&ls->ls_recover_lock);
+ _set_recover_status(ls, DLM_RS_NODES_ALL);
+ ls->ls_num_slots = num_slots;
+ ls->ls_slots_size = slots_size;
+ ls->ls_slots = slots;
+ ls->ls_generation = gen;
+ spin_unlock(&ls->ls_recover_lock);
+ } else {
+ dlm_set_recover_status(ls, DLM_RS_NODES_ALL);
+ }
+ } else {
+ error = wait_status_low(ls, DLM_RS_NODES_ALL, DLM_RSF_NEED_SLOTS);
+ if (error)
+ goto out;
+
+ dlm_slots_copy_in(ls);
+ }
+ out:
+ return error;
}
int dlm_recover_directory_wait(struct dlm_ls *ls)