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@@ -0,0 +1,79 @@
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+/*
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+ * fault injection support for nvme.
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+ *
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+ * Copyright (c) 2018, Oracle and/or its affiliates
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+ *
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+ */
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+
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+#include <linux/moduleparam.h>
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+#include "nvme.h"
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+
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+static DECLARE_FAULT_ATTR(fail_default_attr);
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+/* optional fault injection attributes boot time option:
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+ * nvme_core.fail_request=<interval>,<probability>,<space>,<times>
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+ */
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+static char *fail_request;
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+module_param(fail_request, charp, 0000);
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+
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+void nvme_fault_inject_init(struct nvme_ns *ns)
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+{
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+ struct dentry *dir, *parent;
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+ char *name = ns->disk->disk_name;
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+ struct nvme_fault_inject *fault_inj = &ns->fault_inject;
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+ struct fault_attr *attr = &fault_inj->attr;
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+
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+ /* set default fault injection attribute */
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+ if (fail_request)
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+ setup_fault_attr(&fail_default_attr, fail_request);
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+
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+ /* create debugfs directory and attribute */
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+ parent = debugfs_create_dir(name, NULL);
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+ if (!parent) {
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+ pr_warn("%s: failed to create debugfs directory\n", name);
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+ return;
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+ }
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+
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+ *attr = fail_default_attr;
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+ dir = fault_create_debugfs_attr("fault_inject", parent, attr);
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+ if (IS_ERR(dir)) {
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+ pr_warn("%s: failed to create debugfs attr\n", name);
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+ debugfs_remove_recursive(parent);
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+ return;
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+ }
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+ ns->fault_inject.parent = parent;
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+
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+ /* create debugfs for status code and dont_retry */
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+ fault_inj->status = NVME_SC_INVALID_OPCODE;
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+ fault_inj->dont_retry = true;
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+ debugfs_create_x16("status", 0600, dir, &fault_inj->status);
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+ debugfs_create_bool("dont_retry", 0600, dir, &fault_inj->dont_retry);
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+}
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+
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+void nvme_fault_inject_fini(struct nvme_ns *ns)
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+{
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+ /* remove debugfs directories */
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+ debugfs_remove_recursive(ns->fault_inject.parent);
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+}
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+
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+void nvme_should_fail(struct request *req)
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+{
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+ struct gendisk *disk = req->rq_disk;
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+ struct nvme_ns *ns = NULL;
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+ u16 status;
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+
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+ /*
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+ * make sure this request is coming from a valid namespace
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+ */
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+ if (!disk)
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+ return;
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+
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+ ns = disk->private_data;
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+ if (ns && should_fail(&ns->fault_inject.attr, 1)) {
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+ /* inject status code and DNR bit */
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+ status = ns->fault_inject.status;
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+ if (ns->fault_inject.dont_retry)
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+ status |= NVME_SC_DNR;
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+ nvme_req(req)->status = status;
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+ }
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+}
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+EXPORT_SYMBOL_GPL(nvme_should_fail);
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Thomas Tai