Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

8 files changed, 144 insertions, 82 deletions

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 93628b02ef5d..875c11443817 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -614,6 +614,27 @@ static void ocfs2_dio_end_io(struct kiocb *iocb,
 	ocfs2_rw_unlock(inode, 0);
 }
 
+/*
+ * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen
+ * from ext3.  PageChecked() bits have been removed as OCFS2 does not
+ * do journalled data.
+ */
+static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
+{
+	journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
+
+	journal_invalidatepage(journal, page, offset);
+}
+
+static int ocfs2_releasepage(struct page *page, gfp_t wait)
+{
+	journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
+
+	if (!page_has_buffers(page))
+		return 0;
+	return journal_try_to_free_buffers(journal, page, wait);
+}
+
 static ssize_t ocfs2_direct_IO(int rw,
 			       struct kiocb *iocb,
 			       const struct iovec *iov,
@@ -661,5 +682,8 @@ const struct address_space_operations ocfs2_aops = {
 	.commit_write	= ocfs2_commit_write,
 	.bmap		= ocfs2_bmap,
 	.sync_page	= block_sync_page,
-	.direct_IO	= ocfs2_direct_IO
+	.direct_IO	= ocfs2_direct_IO,
+	.invalidatepage	= ocfs2_invalidatepage,
+	.releasepage	= ocfs2_releasepage,
+	.migratepage	= buffer_migrate_page,
 };
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 5a9779bb9236..eba282da500e 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1234,6 +1234,7 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
 				     const char *page,
 				     size_t count)
 {
+	struct task_struct *hb_task;
 	long fd;
 	int sectsize;
 	char *p = (char *)page;
@@ -1319,20 +1320,28 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
 	 */
 	atomic_set(&reg->hr_steady_iterations, O2HB_LIVE_THRESHOLD + 1);
 
-	reg->hr_task = kthread_run(o2hb_thread, reg, "o2hb-%s",
-				   reg->hr_item.ci_name);
-	if (IS_ERR(reg->hr_task)) {
-		ret = PTR_ERR(reg->hr_task);
+	hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s",
+			      reg->hr_item.ci_name);
+	if (IS_ERR(hb_task)) {
+		ret = PTR_ERR(hb_task);
 		mlog_errno(ret);
-		reg->hr_task = NULL;
 		goto out;
 	}
 
+	spin_lock(&o2hb_live_lock);
+	reg->hr_task = hb_task;
+	spin_unlock(&o2hb_live_lock);
+
 	ret = wait_event_interruptible(o2hb_steady_queue,
 				atomic_read(&reg->hr_steady_iterations) == 0);
 	if (ret) {
-		kthread_stop(reg->hr_task);
+		spin_lock(&o2hb_live_lock);
+		hb_task = reg->hr_task;
 		reg->hr_task = NULL;
+		spin_unlock(&o2hb_live_lock);
+
+		if (hb_task)
+			kthread_stop(hb_task);
 		goto out;
 	}
 
@@ -1354,10 +1363,17 @@ out:
 static ssize_t o2hb_region_pid_read(struct o2hb_region *reg,
                                       char *page)
 {
-	if (!reg->hr_task)
+	pid_t pid = 0;
+
+	spin_lock(&o2hb_live_lock);
+	if (reg->hr_task)
+		pid = reg->hr_task->pid;
+	spin_unlock(&o2hb_live_lock);
+
+	if (!pid)
 		return 0;
 
-	return sprintf(page, "%u\n", reg->hr_task->pid);
+	return sprintf(page, "%u\n", pid);
 }
 
 struct o2hb_region_attribute {
@@ -1495,13 +1511,17 @@ out:
 static void o2hb_heartbeat_group_drop_item(struct config_group *group,
 					   struct config_item *item)
 {
+	struct task_struct *hb_task;
 	struct o2hb_region *reg = to_o2hb_region(item);
 
 	/* stop the thread when the user removes the region dir */
-	if (reg->hr_task) {
-		kthread_stop(reg->hr_task);
-		reg->hr_task = NULL;
-	}
+	spin_lock(&o2hb_live_lock);
+	hb_task = reg->hr_task;
+	reg->hr_task = NULL;
+	spin_unlock(&o2hb_live_lock);
+
+	if (hb_task)
+		kthread_stop(hb_task);
 
 	config_item_put(item);
 }
@@ -1682,7 +1702,7 @@ out:
 }
 EXPORT_SYMBOL_GPL(o2hb_register_callback);
 
-int o2hb_unregister_callback(struct o2hb_callback_func *hc)
+void o2hb_unregister_callback(struct o2hb_callback_func *hc)
 {
 	BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
 
@@ -1690,15 +1710,13 @@ int o2hb_unregister_callback(struct o2hb_callback_func *hc)
 	     __builtin_return_address(0), hc);
 
 	if (list_empty(&hc->hc_item))
-		return 0;
+		return;
 
 	down_write(&o2hb_callback_sem);
 
 	list_del_init(&hc->hc_item);
 
 	up_write(&o2hb_callback_sem);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(o2hb_unregister_callback);
 
diff --git a/fs/ocfs2/cluster/heartbeat.h b/fs/ocfs2/cluster/heartbeat.h
index cac6223206a9..cc6d40b39771 100644
--- a/fs/ocfs2/cluster/heartbeat.h
+++ b/fs/ocfs2/cluster/heartbeat.h
@@ -70,7 +70,7 @@ void o2hb_setup_callback(struct o2hb_callback_func *hc,
 			 void *data,
 			 int priority);
 int o2hb_register_callback(struct o2hb_callback_func *hc);
-int o2hb_unregister_callback(struct o2hb_callback_func *hc);
+void o2hb_unregister_callback(struct o2hb_callback_func *hc);
 void o2hb_fill_node_map(unsigned long *map,
 			unsigned bytes);
 void o2hb_init(void);
diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index 1718215fc018..69caf3e12fea 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -1638,17 +1638,8 @@ static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
 
 void o2net_unregister_hb_callbacks(void)
 {
-	int ret;
-
-	ret = o2hb_unregister_callback(&o2net_hb_up);
-	if (ret < 0)
-		mlog(ML_ERROR, "Status return %d unregistering heartbeat up "
-		     "callback!\n", ret);
-
-	ret = o2hb_unregister_callback(&o2net_hb_down);
-	if (ret < 0)
-		mlog(ML_ERROR, "Status return %d unregistering heartbeat down "
-		     "callback!\n", ret);
+	o2hb_unregister_callback(&o2net_hb_up);
+	o2hb_unregister_callback(&o2net_hb_down);
 }
 
 int o2net_register_hb_callbacks(void)
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 6087c4749fee..c558442a0b44 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -138,8 +138,10 @@ static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
 
 void __dlm_unhash_lockres(struct dlm_lock_resource *lockres)
 {
-	hlist_del_init(&lockres->hash_node);
-	dlm_lockres_put(lockres);
+	if (!hlist_unhashed(&lockres->hash_node)) {
+		hlist_del_init(&lockres->hash_node);
+		dlm_lockres_put(lockres);
+	}
 }
 
 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
@@ -655,6 +657,8 @@ void dlm_unregister_domain(struct dlm_ctxt *dlm)
 		dlm_kick_thread(dlm, NULL);
 
 		while (dlm_migrate_all_locks(dlm)) {
+			/* Give dlm_thread time to purge the lockres' */
+			msleep(500);
 			mlog(0, "%s: more migration to do\n", dlm->name);
 		}
 		dlm_mark_domain_leaving(dlm);
diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 77e4e6169a0d..6edffca99d98 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -2424,6 +2424,57 @@ static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data)
 	dlm_lockres_put(res);
 }
 
+/* Checks whether the lockres can be migrated. Returns 0 if yes, < 0
+ * if not. If 0, numlocks is set to the number of locks in the lockres.
+ */
+static int dlm_is_lockres_migrateable(struct dlm_ctxt *dlm,
+				      struct dlm_lock_resource *res,
+				      int *numlocks)
+{
+	int ret;
+	int i;
+	int count = 0;
+	struct list_head *queue, *iter;
+	struct dlm_lock *lock;
+
+	assert_spin_locked(&res->spinlock);
+
+	ret = -EINVAL;
+	if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
+		mlog(0, "cannot migrate lockres with unknown owner!\n");
+		goto leave;
+	}
+
+	if (res->owner != dlm->node_num) {
+		mlog(0, "cannot migrate lockres this node doesn't own!\n");
+		goto leave;
+	}
+
+	ret = 0;
+	queue = &res->granted;
+	for (i = 0; i < 3; i++) {
+		list_for_each(iter, queue) {
+			lock = list_entry(iter, struct dlm_lock, list);
+			++count;
+			if (lock->ml.node == dlm->node_num) {
+				mlog(0, "found a lock owned by this node still "
+				     "on the %s queue!  will not migrate this "
+				     "lockres\n", (i == 0 ? "granted" :
+						   (i == 1 ? "converting" :
+						    "blocked")));
+				ret = -ENOTEMPTY;
+				goto leave;
+			}
+		}
+		queue++;
+	}
+
+	*numlocks = count;
+	mlog(0, "migrateable lockres having %d locks\n", *numlocks);
+
+leave:
+	return ret;
+}
 
 /*
  * DLM_MIGRATE_LOCKRES
@@ -2437,14 +2488,12 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
 	struct dlm_master_list_entry *mle = NULL;
 	struct dlm_master_list_entry *oldmle = NULL;
  	struct dlm_migratable_lockres *mres = NULL;
-	int ret = -EINVAL;
+	int ret = 0;
 	const char *name;
 	unsigned int namelen;
 	int mle_added = 0;
-	struct list_head *queue, *iter;
-	int i;
-	struct dlm_lock *lock;
-	int empty = 1, wake = 0;
+	int numlocks;
+	int wake = 0;
 
 	if (!dlm_grab(dlm))
 		return -EINVAL;
@@ -2458,42 +2507,16 @@ static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
 	 * ensure this lockres is a proper candidate for migration
 	 */
 	spin_lock(&res->spinlock);
-	if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
-		mlog(0, "cannot migrate lockres with unknown owner!\n");
-		spin_unlock(&res->spinlock);
-		goto leave;
-	}
-	if (res->owner != dlm->node_num) {
-		mlog(0, "cannot migrate lockres this node doesn't own!\n");
+	ret = dlm_is_lockres_migrateable(dlm, res, &numlocks);
+	if (ret < 0) {
 		spin_unlock(&res->spinlock);
 		goto leave;
 	}
-	mlog(0, "checking queues...\n");
-	queue = &res->granted;
-	for (i=0; i<3; i++) {
-		list_for_each(iter, queue) {
-			lock = list_entry (iter, struct dlm_lock, list);
-			empty = 0;
-			if (lock->ml.node == dlm->node_num) {
-				mlog(0, "found a lock owned by this node "
-				     "still on the %s queue!  will not "
-				     "migrate this lockres\n",
-				     i==0 ? "granted" :
-				     (i==1 ? "converting" : "blocked"));
-				spin_unlock(&res->spinlock);
-				ret = -ENOTEMPTY;
-				goto leave;
-			}
-		}
-		queue++;
-	}
-	mlog(0, "all locks on this lockres are nonlocal.  continuing\n");
 	spin_unlock(&res->spinlock);
 
 	/* no work to do */
-	if (empty) {
+	if (numlocks == 0) {
 		mlog(0, "no locks were found on this lockres! done!\n");
-		ret = 0;
 		goto leave;
 	}
 
@@ -2729,15 +2752,26 @@ int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
 {
 	int ret;
 	int lock_dropped = 0;
+	int numlocks;
 
+	spin_lock(&res->spinlock);
 	if (res->owner != dlm->node_num) {
 		if (!__dlm_lockres_unused(res)) {
 			mlog(ML_ERROR, "%s:%.*s: this node is not master, "
 			     "trying to free this but locks remain\n",
 			     dlm->name, res->lockname.len, res->lockname.name);
 		}
+		spin_unlock(&res->spinlock);
+		goto leave;
+	}
+
+	/* No need to migrate a lockres having no locks */
+	ret = dlm_is_lockres_migrateable(dlm, res, &numlocks);
+	if (ret >= 0 && numlocks == 0) {
+		spin_unlock(&res->spinlock);
 		goto leave;
 	}
+	spin_unlock(&res->spinlock);
 
 	/* Wheee! Migrate lockres here! Will sleep so drop spinlock. */
 	spin_unlock(&dlm->spinlock);
diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index 8ffa0916eb86..2b264c6ba039 100644
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -256,18 +256,14 @@ static void dlm_run_purge_list(struct dlm_ctxt *dlm,
 			break;
 		}
 
-		mlog(0, "removing lockres %.*s:%p from purgelist\n",
-		     lockres->lockname.len, lockres->lockname.name, lockres);
-		list_del_init(&lockres->purge);
-		dlm_lockres_put(lockres);
-		dlm->purge_count--;
+		dlm_lockres_get(lockres);
 
 		/* This may drop and reacquire the dlm spinlock if it
 		 * has to do migration. */
-		mlog(0, "calling dlm_purge_lockres!\n");
 		if (dlm_purge_lockres(dlm, lockres))
 			BUG();
-		mlog(0, "DONE calling dlm_purge_lockres!\n");
+
+		dlm_lockres_put(lockres);
 
 		/* Avoid adding any scheduling latencies */
 		cond_resched_lock(&dlm->spinlock);
diff --git a/fs/ocfs2/heartbeat.c b/fs/ocfs2/heartbeat.c
index 8fc52d6d0ce7..b25ef63781ba 100644
--- a/fs/ocfs2/heartbeat.c
+++ b/fs/ocfs2/heartbeat.c
@@ -164,8 +164,10 @@ int ocfs2_register_hb_callbacks(struct ocfs2_super *osb)
 	}
 
 	status = o2hb_register_callback(&osb->osb_hb_up);
-	if (status < 0)
+	if (status < 0) {
 		mlog_errno(status);
+		o2hb_unregister_callback(&osb->osb_hb_down);
+	}
 
 bail:
 	return status;
@@ -173,18 +175,11 @@ bail:
 
 void ocfs2_clear_hb_callbacks(struct ocfs2_super *osb)
 {
-	int status;
-
 	if (ocfs2_mount_local(osb))
 		return;
 
-	status = o2hb_unregister_callback(&osb->osb_hb_down);
-	if (status < 0)
-		mlog_errno(status);
-
-	status = o2hb_unregister_callback(&osb->osb_hb_up);
-	if (status < 0)
-		mlog_errno(status);
+	o2hb_unregister_callback(&osb->osb_hb_down);
+	o2hb_unregister_callback(&osb->osb_hb_up);
 }
 
 void ocfs2_stop_heartbeat(struct ocfs2_super *osb)