From 516b7e52abc7efd61c084b217c61985a403828ed Mon Sep 17 00:00:00 2001 From: Sunil Mushran Date: Thu, 26 Feb 2009 15:00:48 -0800 Subject: ocfs2/dlm: Do not purge lockres that is being migrated dlm_purge_lockres() This patch attempts to fix a fine race between purging and migration. Signed-off-by: Sunil Mushran Signed-off-by: Mark Fasheh --- fs/ocfs2/dlm/dlmthread.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) (limited to 'fs/ocfs2') diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c index 4060bb328bc8..d490b66ad9d7 100644 --- a/fs/ocfs2/dlm/dlmthread.c +++ b/fs/ocfs2/dlm/dlmthread.c @@ -162,12 +162,28 @@ static int dlm_purge_lockres(struct dlm_ctxt *dlm, spin_lock(&res->spinlock); if (!__dlm_lockres_unused(res)) { - spin_unlock(&res->spinlock); mlog(0, "%s:%.*s: tried to purge but not unused\n", dlm->name, res->lockname.len, res->lockname.name); - return -ENOTEMPTY; + __dlm_print_one_lock_resource(res); + spin_unlock(&res->spinlock); + BUG(); } + + if (res->state & DLM_LOCK_RES_MIGRATING) { + mlog(0, "%s:%.*s: Delay dropref as this lockres is " + "being remastered\n", dlm->name, res->lockname.len, + res->lockname.name); + /* Re-add the lockres to the end of the purge list */ + if (!list_empty(&res->purge)) { + list_del_init(&res->purge); + list_add_tail(&res->purge, &dlm->purge_list); + } + spin_unlock(&res->spinlock); + return 0; + } + master = (res->owner == dlm->node_num); + if (!master) res->state |= DLM_LOCK_RES_DROPPING_REF; spin_unlock(&res->spinlock); -- cgit v1.2.3