mirror of https://gitee.com/openkylin/linux.git
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
|
/*
|
||
|
|
* 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_ns *ns)
|
||
|
|
{
|
||
|
|
struct dentry *dir, *parent;
|
||
|
|
char *name = ns->disk->disk_name;
|
||
|
|
struct nvme_fault_inject *fault_inj = &ns->fault_inject;
|
||
|
|
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(name, NULL);
|
||
|
|
if (!parent) {
|
||
|
|
pr_warn("%s: failed to create debugfs directory\n", 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", name);
|
||
|
|
debugfs_remove_recursive(parent);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
ns->fault_inject.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_ns *ns)
|
||
|
|
{
|
||
|
|
/* remove debugfs directories */
|
||
|
|
debugfs_remove_recursive(ns->fault_inject.parent);
|
||
|
|
}
|
||
|
|
|
||
|
|
void nvme_should_fail(struct request *req)
|
||
|
|
{
|
||
|
|
struct gendisk *disk = req->rq_disk;
|
||
|
|
struct nvme_ns *ns = NULL;
|
||
|
|
u16 status;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* make sure this request is coming from a valid namespace
|
||
|
|
*/
|
||
|
|
if (!disk)
|
||
|
|
return;
|
||
|
|
|
||
|
|
ns = disk->private_data;
|
||
|
|
if (ns && should_fail(&ns->fault_inject.attr, 1)) {
|
||
|
|
/* inject status code and DNR bit */
|
||
|
|
status = ns->fault_inject.status;
|
||
|
|
if (ns->fault_inject.dont_retry)
|
||
|
|
status |= NVME_SC_DNR;
|
||
|
|
nvme_req(req)->status = status;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(nvme_should_fail);
|