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authorSunil Mushran <sunil.mushran@oracle.com>2008-12-16 15:49:19 -0800
committerMark Fasheh <mfasheh@suse.com>2009-01-05 08:40:35 -0800
commit2b83256407687613e906bee93d98a25339128a4d (patch)
tree5886c51adcb20b3d735ccf38e1f7e70671aefb43 /fs/ocfs2/dlm
parent58896c4d0e5868360ea0693c607d5bf74f79da6b (diff)
ocfs2/dlm: Fix a race between migrate request and exit domain
Patch address a racing migrate request message and an exit domain message. Instead of blocking exit domains for the duration of the migrate, we ignore failure to deliver that message. This is because an exiting domain should not have any active locks and thus has no role to play in the migration. Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com> Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2/dlm')
-rw-r--r--fs/ocfs2/dlm/dlmmaster.c23
1 files changed, 19 insertions, 4 deletions
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 44f87caf368..92fd1d7d612 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -2949,7 +2949,7 @@ static int dlm_do_migrate_request(struct dlm_ctxt *dlm,
struct dlm_node_iter *iter)
{
struct dlm_migrate_request migrate;
- int ret, status = 0;
+ int ret, skip, status = 0;
int nodenum;
memset(&migrate, 0, sizeof(migrate));
@@ -2966,12 +2966,27 @@ static int dlm_do_migrate_request(struct dlm_ctxt *dlm,
nodenum == new_master)
continue;
+ /* We could race exit domain. If exited, skip. */
+ spin_lock(&dlm->spinlock);
+ skip = (!test_bit(nodenum, dlm->domain_map));
+ spin_unlock(&dlm->spinlock);
+ if (skip) {
+ clear_bit(nodenum, iter->node_map);
+ continue;
+ }
+
ret = o2net_send_message(DLM_MIGRATE_REQUEST_MSG, dlm->key,
&migrate, sizeof(migrate), nodenum,
&status);
- if (ret < 0)
- mlog_errno(ret);
- else if (status < 0) {
+ if (ret < 0) {
+ mlog(0, "migrate_request returned %d!\n", ret);
+ if (!dlm_is_host_down(ret)) {
+ mlog(ML_ERROR, "unhandled error=%d!\n", ret);
+ BUG();
+ }
+ clear_bit(nodenum, iter->node_map);
+ ret = 0;
+ } else if (status < 0) {
mlog(0, "migrate request (node %u) returned %d!\n",
nodenum, status);
ret = status;