Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull quota fixes from Jan Kara:
 "Fixes for oopses when the new quotactl gets used with quotas disabled"

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  ocfs2: Fix Q_GETNEXTQUOTA for filesystem without quotas
  quota: Handle Q_GETNEXTQUOTA when quota is disabled

fs/ocfs2/quota_global.c

@@ -867,6 +867,10 @@ static int ocfs2_get_next_id(struct super_block *sb, struct kqid *qid)
 	int status = 0;
 
 	trace_ocfs2_get_next_id(from_kqid(&init_user_ns, *qid), type);
+	if (!sb_has_quota_loaded(sb, type)) {
+		status = -ESRCH;
+		goto out;
+	}
 	status = ocfs2_lock_global_qf(info, 0);
 	if (status < 0)
 		goto out;
@@ -878,8 +882,11 @@ static int ocfs2_get_next_id(struct super_block *sb, struct kqid *qid)
 out_global:
 	ocfs2_unlock_global_qf(info, 0);
 out:
-	/* Avoid logging ENOENT since it just means there isn't next ID */
-	if (status && status != -ENOENT)
+	/*
+	 * Avoid logging ENOENT since it just means there isn't next ID and
+	 * ESRCH which means quota isn't enabled for the filesystem.
+	 */
+	if (status && status != -ENOENT && status != -ESRCH)
 		mlog_errno(status);
 	return status;
 }

fs/quota/dquot.c

@@ -2047,11 +2047,20 @@ int dquot_get_next_id(struct super_block *sb, struct kqid *qid)
 	struct quota_info *dqopt = sb_dqopt(sb);
 	int err;
 
-	if (!dqopt->ops[qid->type]->get_next_id)
-		return -ENOSYS;
+	mutex_lock(&dqopt->dqonoff_mutex);
+	if (!sb_has_quota_active(sb, qid->type)) {
+		err = -ESRCH;
+		goto out;
+	}
+	if (!dqopt->ops[qid->type]->get_next_id) {
+		err = -ENOSYS;
+		goto out;
+	}
 	mutex_lock(&dqopt->dqio_mutex);
 	err = dqopt->ops[qid->type]->get_next_id(sb, qid);
 	mutex_unlock(&dqopt->dqio_mutex);
+out:
+	mutex_unlock(&dqopt->dqonoff_mutex);
 
 	return err;
 }