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ocfs2: add DLM recovery callbacks 

These are the callbacks called by the fs/dlm code in case the membership
changes.  If there is a failure while/during calling any of these, the
DLM creates a new membership and relays to the rest of the nodes.

 - recover_prep() is called when DLM understands a node is down.
 - recover_slot() is called once all nodes have acknowledged
   recover_prep and recovery can begin.
 - recover_done() is called once the recovery is complete.  It returns
   the new membership.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Goldwyn Rodrigues 2014-01-21 15:48:22 -08:00 committed by Linus Torvalds
parent c74a3bdd9b
commit 66e188fc31
1 changed files with 38 additions and 0 deletions
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38
fs/ocfs2/stack_user.c
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@ -110,6 +110,8 @@
struct ocfs2_live_connection { struct ocfs2_live_connection {
struct list_head oc_list; struct list_head oc_list;
struct ocfs2_cluster_connection *oc_conn; struct ocfs2_cluster_connection *oc_conn;
atomic_t oc_this_node;
int oc_our_slot;
}; };
struct ocfs2_control_private { struct ocfs2_control_private {
@ -799,6 +801,42 @@ static int fs_protocol_compare(struct ocfs2_protocol_version *existing,
return 0; return 0;
} }
static void user_recover_prep(void *arg)
{
}
static void user_recover_slot(void *arg, struct dlm_slot *slot)
{
struct ocfs2_cluster_connection *conn = arg;
printk(KERN_INFO "ocfs2: Node %d/%d down. Initiating recovery.\n",
slot->nodeid, slot->slot);
conn->cc_recovery_handler(slot->nodeid, conn->cc_recovery_data);
}
static void user_recover_done(void *arg, struct dlm_slot *slots,
int num_slots, int our_slot,
uint32_t generation)
{
struct ocfs2_cluster_connection *conn = arg;
struct ocfs2_live_connection *lc = conn->cc_private;
int i;
for (i = 0; i < num_slots; i++)
if (slots[i].slot == our_slot) {
atomic_set(&lc->oc_this_node, slots[i].nodeid);
break;
}
lc->oc_our_slot = our_slot;
}
const struct dlm_lockspace_ops ocfs2_ls_ops = {
.recover_prep = user_recover_prep,
.recover_slot = user_recover_slot,
.recover_done = user_recover_done,
};
static int user_cluster_connect(struct ocfs2_cluster_connection *conn) static int user_cluster_connect(struct ocfs2_cluster_connection *conn)
{ {
dlm_lockspace_t *fsdlm; dlm_lockspace_t *fsdlm;