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-rw-r--r--fs/ocfs2/dlm/dlmlock.c12
-rw-r--r--fs/ocfs2/dlm/dlmmaster.c47
-rw-r--r--fs/ocfs2/dlm/dlmthread.c12
3 files changed, 32 insertions, 39 deletions
diff --git a/fs/ocfs2/dlm/dlmlock.c b/fs/ocfs2/dlm/dlmlock.c
index c7f3e22bda1e..3ef2c1adfb8f 100644
--- a/fs/ocfs2/dlm/dlmlock.c
+++ b/fs/ocfs2/dlm/dlmlock.c
@@ -183,10 +183,6 @@ static enum dlm_status dlmlock_master(struct dlm_ctxt *dlm,
kick_thread = 1;
}
}
- /* reduce the inflight count, this may result in the lockres
- * being purged below during calc_usage */
- if (lock->ml.node == dlm->node_num)
- dlm_lockres_drop_inflight_ref(dlm, res);
spin_unlock(&res->spinlock);
wake_up(&res->wq);
@@ -737,6 +733,14 @@ retry_lock:
}
}
+ /* Inflight taken in dlm_get_lock_resource() is dropped here */
+ spin_lock(&res->spinlock);
+ dlm_lockres_drop_inflight_ref(dlm, res);
+ spin_unlock(&res->spinlock);
+
+ dlm_lockres_calc_usage(dlm, res);
+ dlm_kick_thread(dlm, res);
+
if (status != DLM_NORMAL) {
lock->lksb->flags &= ~DLM_LKSB_GET_LVB;
if (status != DLM_NOTQUEUED)
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 11e446ffb67a..005261c333b0 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -659,11 +659,8 @@ void dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
{
assert_spin_locked(&res->spinlock);
- if (!test_bit(dlm->node_num, res->refmap)) {
- BUG_ON(res->inflight_locks != 0);
- dlm_lockres_set_refmap_bit(dlm, res, dlm->node_num);
- }
res->inflight_locks++;
+
mlog(0, "%s: res %.*s, inflight++: now %u, %ps()\n", dlm->name,
res->lockname.len, res->lockname.name, res->inflight_locks,
__builtin_return_address(0));
@@ -677,12 +674,11 @@ void dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
BUG_ON(res->inflight_locks == 0);
res->inflight_locks--;
+
mlog(0, "%s: res %.*s, inflight--: now %u, %ps()\n", dlm->name,
res->lockname.len, res->lockname.name, res->inflight_locks,
__builtin_return_address(0));
- if (res->inflight_locks == 0)
- dlm_lockres_clear_refmap_bit(dlm, res, dlm->node_num);
wake_up(&res->wq);
}
@@ -716,7 +712,6 @@ struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
unsigned int hash;
int tries = 0;
int bit, wait_on_recovery = 0;
- int drop_inflight_if_nonlocal = 0;
BUG_ON(!lockid);
@@ -728,36 +723,33 @@ lookup:
spin_lock(&dlm->spinlock);
tmpres = __dlm_lookup_lockres_full(dlm, lockid, namelen, hash);
if (tmpres) {
- int dropping_ref = 0;
-
spin_unlock(&dlm->spinlock);
-
spin_lock(&tmpres->spinlock);
- /* We wait for the other thread that is mastering the resource */
+ /* Wait on the thread that is mastering the resource */
if (tmpres->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
__dlm_wait_on_lockres(tmpres);
BUG_ON(tmpres->owner == DLM_LOCK_RES_OWNER_UNKNOWN);
+ spin_unlock(&tmpres->spinlock);
+ dlm_lockres_put(tmpres);
+ tmpres = NULL;
+ goto lookup;
}
- if (tmpres->owner == dlm->node_num) {
- BUG_ON(tmpres->state & DLM_LOCK_RES_DROPPING_REF);
- dlm_lockres_grab_inflight_ref(dlm, tmpres);
- } else if (tmpres->state & DLM_LOCK_RES_DROPPING_REF)
- dropping_ref = 1;
- spin_unlock(&tmpres->spinlock);
-
- /* wait until done messaging the master, drop our ref to allow
- * the lockres to be purged, start over. */
- if (dropping_ref) {
- spin_lock(&tmpres->spinlock);
- __dlm_wait_on_lockres_flags(tmpres, DLM_LOCK_RES_DROPPING_REF);
+ /* Wait on the resource purge to complete before continuing */
+ if (tmpres->state & DLM_LOCK_RES_DROPPING_REF) {
+ BUG_ON(tmpres->owner == dlm->node_num);
+ __dlm_wait_on_lockres_flags(tmpres,
+ DLM_LOCK_RES_DROPPING_REF);
spin_unlock(&tmpres->spinlock);
dlm_lockres_put(tmpres);
tmpres = NULL;
goto lookup;
}
- mlog(0, "found in hash!\n");
+ /* Grab inflight ref to pin the resource */
+ dlm_lockres_grab_inflight_ref(dlm, tmpres);
+
+ spin_unlock(&tmpres->spinlock);
if (res)
dlm_lockres_put(res);
res = tmpres;
@@ -863,14 +855,11 @@ lookup:
/* finally add the lockres to its hash bucket */
__dlm_insert_lockres(dlm, res);
+ /* Grab inflight ref to pin the resource */
spin_lock(&res->spinlock);
dlm_lockres_grab_inflight_ref(dlm, res);
spin_unlock(&res->spinlock);
- /* if this node does not become the master make sure to drop
- * this inflight reference below */
- drop_inflight_if_nonlocal = 1;
-
/* get an extra ref on the mle in case this is a BLOCK
* if so, the creator of the BLOCK may try to put the last
* ref at this time in the assert master handler, so we
@@ -973,8 +962,6 @@ wait:
wake_waiters:
spin_lock(&res->spinlock);
- if (res->owner != dlm->node_num && drop_inflight_if_nonlocal)
- dlm_lockres_drop_inflight_ref(dlm, res);
res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
spin_unlock(&res->spinlock);
wake_up(&res->wq);
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 4eff65e7e59e..e73c833fc2a1 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -94,24 +94,26 @@ int __dlm_lockres_unused(struct dlm_lock_resource *res)
{
int bit;
+ assert_spin_locked(&res->spinlock);
+
if (__dlm_lockres_has_locks(res))
return 0;
+ /* Locks are in the process of being created */
+ if (res->inflight_locks)
+ return 0;
+
if (!list_empty(&res->dirty) || res->state & DLM_LOCK_RES_DIRTY)
return 0;
if (res->state & DLM_LOCK_RES_RECOVERING)
return 0;
+ /* Another node has this resource with this node as the master */
bit = find_next_bit(res->refmap, O2NM_MAX_NODES, 0);
if (bit < O2NM_MAX_NODES)
return 0;
- /*
- * since the bit for dlm->node_num is not set, inflight_locks better
- * be zero
- */
- BUG_ON(res->inflight_locks != 0);
return 1;
}
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