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o2dlm: force free mles during dlm exit 

While umounting, a block mle doesn't get freed if dlm is shutdown after
master request is received but before assert master. This results in unclean
shutdown of dlm domain.

This patch frees all mles that lie around after other nodes were notified about
exiting the dlm and marking dlm state as leaving. Only block mles are expected
to be around, so we log ERROR for other mles but still free them.

Signed-off-by: Srinivas Eeda <srinivas.eeda@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Srinivas Eeda 2010-09-21 16:27:26 -07:00 committed by Joel Becker
parent 0000b86202
commit 5dad6c39d1
3 changed files with 42 additions and 0 deletions
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1
fs/ocfs2/dlm/dlmcommon.h
View File

@ -1030,6 +1030,7 @@ int dlm_drop_lockres_ref(struct dlm_ctxt *dlm,
struct dlm_lock_resource *res);
void dlm_clean_master_list(struct dlm_ctxt *dlm,
u8 dead_node);
void dlm_force_free_mles(struct dlm_ctxt *dlm);
int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock);
int __dlm_lockres_has_locks(struct dlm_lock_resource *res);
int __dlm_lockres_unused(struct dlm_lock_resource *res);

1
fs/ocfs2/dlm/dlmdomain.c
View File

@ -693,6 +693,7 @@ void dlm_unregister_domain(struct dlm_ctxt *dlm)
dlm_mark_domain_leaving(dlm);
dlm_leave_domain(dlm);
dlm_force_free_mles(dlm);
dlm_complete_dlm_shutdown(dlm);
}
dlm_put(dlm);

40
fs/ocfs2/dlm/dlmmaster.c
View File

@ -3433,3 +3433,43 @@ void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
wake_up(&res->wq);
wake_up(&dlm->migration_wq);
}
void dlm_force_free_mles(struct dlm_ctxt *dlm)
{
int i;
struct hlist_head *bucket;
struct dlm_master_list_entry *mle;
struct hlist_node *tmp, *list;
/*
* We notified all other nodes that we are exiting the domain and
* marked the dlm state to DLM_CTXT_LEAVING. If any mles are still
* around we force free them and wake any processes that are waiting
* on the mles
*/
spin_lock(&dlm->spinlock);
spin_lock(&dlm->master_lock);
BUG_ON(dlm->dlm_state != DLM_CTXT_LEAVING);
BUG_ON((find_next_bit(dlm->domain_map, O2NM_MAX_NODES, 0) < O2NM_MAX_NODES));
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
bucket = dlm_master_hash(dlm, i);
hlist_for_each_safe(list, tmp, bucket) {
mle = hlist_entry(list, struct dlm_master_list_entry,
master_hash_node);
if (mle->type != DLM_MLE_BLOCK) {
mlog(ML_ERROR, "bad mle: %p\n", mle);
dlm_print_one_mle(mle);
}
atomic_set(&mle->woken, 1);
wake_up(&mle->wq);
__dlm_unlink_mle(dlm, mle);
__dlm_mle_detach_hb_events(dlm, mle);
__dlm_put_mle(mle);
}
}
spin_unlock(&dlm->master_lock);
spin_unlock(&dlm->spinlock);
}