ocfs2_dlm: Fixes race between migrate and dirty
dlmthread was removing lockres' from the dirty list
and resetting the dirty flag before shuffling the list.
This patch retains the dirty state flag until the lists
are shuffled.
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Sunil Mushran <Sunil.Mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index baa9997..3b94e4d 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -95,7 +95,7 @@
int __dlm_lockres_unused(struct dlm_lock_resource *res)
{
if (!__dlm_lockres_has_locks(res) &&
- list_empty(&res->dirty)) {
+ (list_empty(&res->dirty) && !(res->state & DLM_LOCK_RES_DIRTY))) {
/* try not to scan the bitmap unless the first two
* conditions are already true */
int bit = find_next_bit(res->refmap, O2NM_MAX_NODES, 0);
@@ -455,12 +455,17 @@
assert_spin_locked(&res->spinlock);
/* don't shuffle secondary queues */
- if ((res->owner == dlm->node_num) &&
- !(res->state & DLM_LOCK_RES_DIRTY)) {
- /* ref for dirty_list */
- dlm_lockres_get(res);
- list_add_tail(&res->dirty, &dlm->dirty_list);
- res->state |= DLM_LOCK_RES_DIRTY;
+ if ((res->owner == dlm->node_num)) {
+ if (res->state & (DLM_LOCK_RES_MIGRATING |
+ DLM_LOCK_RES_BLOCK_DIRTY))
+ return;
+
+ if (list_empty(&res->dirty)) {
+ /* ref for dirty_list */
+ dlm_lockres_get(res);
+ list_add_tail(&res->dirty, &dlm->dirty_list);
+ res->state |= DLM_LOCK_RES_DIRTY;
+ }
}
}
@@ -639,7 +644,7 @@
dlm_lockres_get(res);
spin_lock(&res->spinlock);
- res->state &= ~DLM_LOCK_RES_DIRTY;
+ /* We clear the DLM_LOCK_RES_DIRTY state once we shuffle lists below */
list_del_init(&res->dirty);
spin_unlock(&res->spinlock);
spin_unlock(&dlm->spinlock);
@@ -663,10 +668,11 @@
/* it is now ok to move lockreses in these states
* to the dirty list, assuming that they will only be
* dirty for a short while. */
+ BUG_ON(res->state & DLM_LOCK_RES_MIGRATING);
if (res->state & (DLM_LOCK_RES_IN_PROGRESS |
- DLM_LOCK_RES_MIGRATING |
DLM_LOCK_RES_RECOVERING)) {
/* move it to the tail and keep going */
+ res->state &= ~DLM_LOCK_RES_DIRTY;
spin_unlock(&res->spinlock);
mlog(0, "delaying list shuffling for in-"
"progress lockres %.*s, state=%d\n",
@@ -687,6 +693,7 @@
/* called while holding lockres lock */
dlm_shuffle_lists(dlm, res);
+ res->state &= ~DLM_LOCK_RES_DIRTY;
spin_unlock(&res->spinlock);
dlm_lockres_calc_usage(dlm, res);
@@ -697,11 +704,8 @@
/* if the lock was in-progress, stick
* it on the back of the list */
if (delay) {
- /* ref for dirty_list */
- dlm_lockres_get(res);
spin_lock(&res->spinlock);
- list_add_tail(&res->dirty, &dlm->dirty_list);
- res->state |= DLM_LOCK_RES_DIRTY;
+ __dlm_dirty_lockres(dlm, res);
spin_unlock(&res->spinlock);
}
dlm_lockres_put(res);