mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
2.2 KiB
82 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* fault injection support for nvme. |
|
* |
|
* Copyright (c) 2018, Oracle and/or its affiliates |
|
*/ |
|
|
|
#include <linux/moduleparam.h> |
|
#include "nvme.h" |
|
|
|
static DECLARE_FAULT_ATTR(fail_default_attr); |
|
/* optional fault injection attributes boot time option: |
|
* nvme_core.fail_request=<interval>,<probability>,<space>,<times> |
|
*/ |
|
static char *fail_request; |
|
module_param(fail_request, charp, 0000); |
|
|
|
void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj, |
|
const char *dev_name) |
|
{ |
|
struct dentry *dir, *parent; |
|
struct fault_attr *attr = &fault_inj->attr; |
|
|
|
/* set default fault injection attribute */ |
|
if (fail_request) |
|
setup_fault_attr(&fail_default_attr, fail_request); |
|
|
|
/* create debugfs directory and attribute */ |
|
parent = debugfs_create_dir(dev_name, NULL); |
|
if (!parent) { |
|
pr_warn("%s: failed to create debugfs directory\n", dev_name); |
|
return; |
|
} |
|
|
|
*attr = fail_default_attr; |
|
dir = fault_create_debugfs_attr("fault_inject", parent, attr); |
|
if (IS_ERR(dir)) { |
|
pr_warn("%s: failed to create debugfs attr\n", dev_name); |
|
debugfs_remove_recursive(parent); |
|
return; |
|
} |
|
fault_inj->parent = parent; |
|
|
|
/* create debugfs for status code and dont_retry */ |
|
fault_inj->status = NVME_SC_INVALID_OPCODE; |
|
fault_inj->dont_retry = true; |
|
debugfs_create_x16("status", 0600, dir, &fault_inj->status); |
|
debugfs_create_bool("dont_retry", 0600, dir, &fault_inj->dont_retry); |
|
} |
|
|
|
void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject) |
|
{ |
|
/* remove debugfs directories */ |
|
debugfs_remove_recursive(fault_inject->parent); |
|
} |
|
|
|
void nvme_should_fail(struct request *req) |
|
{ |
|
struct gendisk *disk = req->rq_disk; |
|
struct nvme_fault_inject *fault_inject = NULL; |
|
u16 status; |
|
|
|
if (disk) { |
|
struct nvme_ns *ns = disk->private_data; |
|
|
|
if (ns) |
|
fault_inject = &ns->fault_inject; |
|
else |
|
WARN_ONCE(1, "No namespace found for request\n"); |
|
} else { |
|
fault_inject = &nvme_req(req)->ctrl->fault_inject; |
|
} |
|
|
|
if (fault_inject && should_fail(&fault_inject->attr, 1)) { |
|
/* inject status code and DNR bit */ |
|
status = fault_inject->status; |
|
if (fault_inject->dont_retry) |
|
status |= NVME_SC_DNR; |
|
nvme_req(req)->status = status; |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(nvme_should_fail);
|
|
|