From 36407488b1cbc4d84bc2bd14e03f3f9b768090d9 Mon Sep 17 00:00:00 2001 From: Kurt Hackel Date: Mon, 1 May 2006 13:32:27 -0700 Subject: ocfs2: pending mastery asserts and migrations should block each other Use the existing structure for blocking migrations when ASTs are pending to achieve the same result. If we can catch the assert before it goes on the wire, just cancel it and let the migration continue. Signed-off-by: Kurt Hackel Signed-off-by: Mark Fasheh --- fs/ocfs2/dlm/dlmmaster.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'fs') 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"); -- cgit v1.2.3