diff options
| -rw-r--r-- | fs/ocfs2/dlm/dlmmaster.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c index 21081bcfa09..78ba77bf3a7 100644 --- a/fs/ocfs2/dlm/dlmmaster.c +++ b/fs/ocfs2/dlm/dlmmaster.c @@ -2000,6 +2000,23 @@ static void dlm_assert_master_worker(struct dlm_work_item *item, void *data) } } + /* + * If we're migrating this lock to someone else, we are no + * longer allowed to assert out own mastery. OTOH, we need to + * prevent migration from starting while we're still asserting + * our dominance. The reserved ast delays migration. + */ + spin_lock(&res->spinlock); + if (res->state & DLM_LOCK_RES_MIGRATING) { + mlog(0, "Someone asked us to assert mastery, but we're " + "in the middle of migration. Skipping assert, " + "the new master will handle that.\n"); + spin_unlock(&res->spinlock); + goto put; + } else + __dlm_lockres_reserve_ast(res); + spin_unlock(&res->spinlock); + /* this call now finishes out the nodemap * even if one or more nodes die */ mlog(0, "worker about to master %.*s here, this=%u\n", @@ -2012,6 +2029,10 @@ static void dlm_assert_master_worker(struct dlm_work_item *item, void *data) mlog_errno(ret); } + /* Ok, we've asserted ourselves. Let's let migration start. */ + dlm_lockres_release_ast(dlm, res); + +put: dlm_lockres_put(res); mlog(0, "finished with dlm_assert_master_worker\n"); |