/*
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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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#include <linux/moduleparam.h>
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#include "nvme.h"
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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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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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/* 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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/* 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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*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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/* 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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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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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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* 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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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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