Commit a3646451 authored by Akinobu Mita's avatar Akinobu Mita Committed by Christoph Hellwig
Browse files

nvme: prepare for fault injection into admin commands 



Currenlty fault injection support for nvme only enables to inject errors
into the commands submitted to I/O queues.

In preparation for fault injection into the admin commands, this makes
the helper functions independent of struct nvme_ns.

Signed-off-by: default avatarAkinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: default avatarMinwoo Im <minwoo.im.dev@gmail.com>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Reviewed-by: default avatarChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent a5448fdc

drivers/nvme/host/core.c

+2 −2
Original line number Diff line number Diff line
@@ -3336,7 +3336,7 @@ static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) 
	device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);



	nvme_mpath_add_disk(ns, id);

	nvme_fault_inject_init(ns);

	nvme_fault_inject_init(&ns->fault_inject, ns->disk->disk_name);

	kfree(id);



	return 0;
@@ -3361,7 +3361,7 @@ static void nvme_ns_remove(struct nvme_ns *ns) 
	if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags))

		return;



	nvme_fault_inject_fini(ns);

	nvme_fault_inject_fini(&ns->fault_inject);



	mutex_lock(&ns->ctrl->subsys->lock);

	list_del_rcu(&ns->siblings);

drivers/nvme/host/fault_inject.c

+20 −16
Original line number Diff line number Diff line
@@ -15,11 +15,10 @@ static DECLARE_FAULT_ATTR(fail_default_attr); 
static char *fail_request;

module_param(fail_request, charp, 0000);



void nvme_fault_inject_init(struct nvme_ns *ns)

void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,

			    const char *dev_name)

{

	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 */
@@ -27,20 +26,20 @@ void nvme_fault_inject_init(struct nvme_ns *ns) 
		setup_fault_attr(&fail_default_attr, fail_request);



	/* create debugfs directory and attribute */

	parent = debugfs_create_dir(name, NULL);

	parent = debugfs_create_dir(dev_name, NULL);

	if (!parent) {

		pr_warn("%s: failed to create debugfs directory\n", name);

		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", name);

		pr_warn("%s: failed to create debugfs attr\n", dev_name);

		debugfs_remove_recursive(parent);

		return;

	}

	ns->fault_inject.parent = parent;

	fault_inj->parent = parent;



	/* create debugfs for status code and dont_retry */

	fault_inj->status = NVME_SC_INVALID_OPCODE;
@@ -49,29 +48,34 @@ void nvme_fault_inject_init(struct nvme_ns *ns) 
	debugfs_create_bool("dont_retry", 0600, dir, &fault_inj->dont_retry);

}



void nvme_fault_inject_fini(struct nvme_ns *ns)

void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject)

{

	/* remove debugfs directories */

	debugfs_remove_recursive(ns->fault_inject.parent);

	debugfs_remove_recursive(fault_inject->parent);

}



void nvme_should_fail(struct request *req)

{

	struct gendisk *disk = req->rq_disk;

	struct nvme_ns *ns = NULL;

	struct nvme_fault_inject *fault_inject = NULL;

	u16 status;



	/*

	 * make sure this request is coming from a valid namespace

	 */

	if (!disk)

		return;

	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");

	}



	ns = disk->private_data;

	if (ns && should_fail(&ns->fault_inject.attr, 1)) {

	if (fault_inject && should_fail(&fault_inject->attr, 1)) {

		/* inject status code and DNR bit */

		status = ns->fault_inject.status;

		if (ns->fault_inject.dont_retry)

		status = fault_inject->status;

		if (fault_inject->dont_retry)

			status |= NVME_SC_DNR;

		nvme_req(req)->status =	status;

	}

drivers/nvme/host/nvme.h

+19 −15
Original line number Diff line number Diff line
@@ -146,6 +146,15 @@ enum nvme_ctrl_state { 
	NVME_CTRL_DEAD,

};



struct nvme_fault_inject {

#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS

	struct fault_attr attr;

	struct dentry *parent;

	bool dont_retry;	/* DNR, do not retry */

	u16 status;		/* status code */

#endif

};



struct nvme_ctrl {

	bool comp_seen;

	enum nvme_ctrl_state state;
@@ -313,15 +322,6 @@ struct nvme_ns_head { 
#endif

};



#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS

struct nvme_fault_inject {

	struct fault_attr attr;

	struct dentry *parent;

	bool dont_retry;	/* DNR, do not retry */

	u16 status;		/* status code */

};

#endif



struct nvme_ns {

	struct list_head list;
@@ -349,9 +349,7 @@ struct nvme_ns { 
#define NVME_NS_ANA_PENDING	2

	u16 noiob;



#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS

	struct nvme_fault_inject fault_inject;

#endif



};
@@ -372,12 +370,18 @@ struct nvme_ctrl_ops { 
};



#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS

void nvme_fault_inject_init(struct nvme_ns *ns);

void nvme_fault_inject_fini(struct nvme_ns *ns);

void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,

			    const char *dev_name);

void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inject);

void nvme_should_fail(struct request *req);

#else

static inline void nvme_fault_inject_init(struct nvme_ns *ns) {}

static inline void nvme_fault_inject_fini(struct nvme_ns *ns) {}

static inline void nvme_fault_inject_init(struct nvme_fault_inject *fault_inj,

					  const char *dev_name)

{

}

static inline void nvme_fault_inject_fini(struct nvme_fault_inject *fault_inj)

{

}

static inline void nvme_should_fail(struct request *req) {}

#endif

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