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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2020 Anna Schumaker <Anna.Schumaker@Netapp.com>
*/
#include <linux/sunrpc/clnt.h>
#include <linux/kobject.h>
#include "sysfs.h"
static struct kset *rpc_sunrpc_kset;
static struct kobject *rpc_sunrpc_client_kobj, *rpc_sunrpc_xprt_switch_kobj;
static void rpc_sysfs_object_release(struct kobject *kobj)
{
kfree(kobj);
}
static const struct kobj_ns_type_operations *
rpc_sysfs_object_child_ns_type(struct kobject *kobj)
{
return &net_ns_type_operations;
}
static struct kobj_type rpc_sysfs_object_type = {
.release = rpc_sysfs_object_release,
.sysfs_ops = &kobj_sysfs_ops,
.child_ns_type = rpc_sysfs_object_child_ns_type,
};
static struct kobject *rpc_sysfs_object_alloc(const char *name,
struct kset *kset,
struct kobject *parent)
{
struct kobject *kobj;
kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
if (kobj) {
kobj->kset = kset;
if (kobject_init_and_add(kobj, &rpc_sysfs_object_type,
parent, "%s", name) == 0)
return kobj;
kobject_put(kobj);
}
return NULL;
}
int rpc_sysfs_init(void)
{
rpc_sunrpc_kset = kset_create_and_add("sunrpc", NULL, kernel_kobj);
if (!rpc_sunrpc_kset)
return -ENOMEM;
rpc_sunrpc_client_kobj =
rpc_sysfs_object_alloc("rpc-clients", rpc_sunrpc_kset, NULL);
if (!rpc_sunrpc_client_kobj)
goto err_client;
rpc_sunrpc_xprt_switch_kobj =
rpc_sysfs_object_alloc("xprt-switches", rpc_sunrpc_kset, NULL);
if (!rpc_sunrpc_xprt_switch_kobj)
goto err_switch;
return 0;
err_switch:
kobject_put(rpc_sunrpc_client_kobj);
rpc_sunrpc_client_kobj = NULL;
err_client:
kset_unregister(rpc_sunrpc_kset);
rpc_sunrpc_kset = NULL;
return -ENOMEM;
}
static void rpc_sysfs_client_release(struct kobject *kobj)
{
struct rpc_sysfs_client *c;
c = container_of(kobj, struct rpc_sysfs_client, kobject);
kfree(c);
}
static void rpc_sysfs_xprt_switch_release(struct kobject *kobj)
{
struct rpc_sysfs_xprt_switch *xprt_switch;
xprt_switch = container_of(kobj, struct rpc_sysfs_xprt_switch, kobject);
kfree(xprt_switch);
}
static void rpc_sysfs_xprt_release(struct kobject *kobj)
{
struct rpc_sysfs_xprt *xprt;
xprt = container_of(kobj, struct rpc_sysfs_xprt, kobject);
kfree(xprt);
}
static const void *rpc_sysfs_client_namespace(struct kobject *kobj)
{
return container_of(kobj, struct rpc_sysfs_client, kobject)->net;
}
static const void *rpc_sysfs_xprt_switch_namespace(struct kobject *kobj)
{
return container_of(kobj, struct rpc_sysfs_xprt_switch, kobject)->net;
}
static const void *rpc_sysfs_xprt_namespace(struct kobject *kobj)
{
return container_of(kobj, struct rpc_sysfs_xprt,
kobject)->xprt->xprt_net;
}
static struct kobj_type rpc_sysfs_client_type = {
.release = rpc_sysfs_client_release,
.sysfs_ops = &kobj_sysfs_ops,
.namespace = rpc_sysfs_client_namespace,
};
static struct kobj_type rpc_sysfs_xprt_switch_type = {
.release = rpc_sysfs_xprt_switch_release,
.sysfs_ops = &kobj_sysfs_ops,
.namespace = rpc_sysfs_xprt_switch_namespace,
};
static struct kobj_type rpc_sysfs_xprt_type = {
.release = rpc_sysfs_xprt_release,
.sysfs_ops = &kobj_sysfs_ops,
.namespace = rpc_sysfs_xprt_namespace,
};
void rpc_sysfs_exit(void)
{
kobject_put(rpc_sunrpc_client_kobj);
kobject_put(rpc_sunrpc_xprt_switch_kobj);
kset_unregister(rpc_sunrpc_kset);
}
static struct rpc_sysfs_client *rpc_sysfs_client_alloc(struct kobject *parent,
struct net *net,
int clid)
{
struct rpc_sysfs_client *p;
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (p) {
p->net = net;
p->kobject.kset = rpc_sunrpc_kset;
if (kobject_init_and_add(&p->kobject, &rpc_sysfs_client_type,
parent, "clnt-%d", clid) == 0)
return p;
kobject_put(&p->kobject);
}
return NULL;
}
static struct rpc_sysfs_xprt_switch *
rpc_sysfs_xprt_switch_alloc(struct kobject *parent,
struct rpc_xprt_switch *xprt_switch,
struct net *net,
gfp_t gfp_flags)
{
struct rpc_sysfs_xprt_switch *p;
p = kzalloc(sizeof(*p), gfp_flags);
if (p) {
p->net = net;
p->kobject.kset = rpc_sunrpc_kset;
if (kobject_init_and_add(&p->kobject,
&rpc_sysfs_xprt_switch_type,
parent, "switch-%d",
xprt_switch->xps_id) == 0)
return p;
kobject_put(&p->kobject);
}
return NULL;
}
static struct rpc_sysfs_xprt *rpc_sysfs_xprt_alloc(struct kobject *parent,
struct rpc_xprt *xprt,
gfp_t gfp_flags)
{
struct rpc_sysfs_xprt *p;
p = kzalloc(sizeof(*p), gfp_flags);
if (!p)
goto out;
p->kobject.kset = rpc_sunrpc_kset;
if (kobject_init_and_add(&p->kobject, &rpc_sysfs_xprt_type,
parent, "xprt-%d-%s", xprt->id,
xprt->address_strings[RPC_DISPLAY_PROTO]) == 0)
return p;
kobject_put(&p->kobject);
out:
return NULL;
}
void rpc_sysfs_client_setup(struct rpc_clnt *clnt,
struct rpc_xprt_switch *xprt_switch,
struct net *net)
{
struct rpc_sysfs_client *rpc_client;
rpc_client = rpc_sysfs_client_alloc(rpc_sunrpc_client_kobj,
net, clnt->cl_clid);
if (rpc_client) {
char name[] = "switch";
struct rpc_sysfs_xprt_switch *xswitch =
(struct rpc_sysfs_xprt_switch *)xprt_switch->xps_sysfs;
int ret;
clnt->cl_sysfs = rpc_client;
rpc_client->clnt = clnt;
rpc_client->xprt_switch = xprt_switch;
kobject_uevent(&rpc_client->kobject, KOBJ_ADD);
ret = sysfs_create_link_nowarn(&rpc_client->kobject,
&xswitch->kobject, name);
if (ret)
pr_warn("can't create link to %s in sysfs (%d)\n",
name, ret);
}
}
void rpc_sysfs_xprt_switch_setup(struct rpc_xprt_switch *xprt_switch,
struct rpc_xprt *xprt,
gfp_t gfp_flags)
{
struct rpc_sysfs_xprt_switch *rpc_xprt_switch;
struct net *net;
if (xprt_switch->xps_net)
net = xprt_switch->xps_net;
else
net = xprt->xprt_net;
rpc_xprt_switch =
rpc_sysfs_xprt_switch_alloc(rpc_sunrpc_xprt_switch_kobj,
xprt_switch, net, gfp_flags);
if (rpc_xprt_switch) {
xprt_switch->xps_sysfs = rpc_xprt_switch;
rpc_xprt_switch->xprt_switch = xprt_switch;
rpc_xprt_switch->xprt = xprt;
kobject_uevent(&rpc_xprt_switch->kobject, KOBJ_ADD);
}
}
void rpc_sysfs_xprt_setup(struct rpc_xprt_switch *xprt_switch,
struct rpc_xprt *xprt,
gfp_t gfp_flags)
{
struct rpc_sysfs_xprt *rpc_xprt;
struct rpc_sysfs_xprt_switch *switch_obj =
(struct rpc_sysfs_xprt_switch *)xprt_switch->xps_sysfs;
rpc_xprt = rpc_sysfs_xprt_alloc(&switch_obj->kobject, xprt, gfp_flags);
if (rpc_xprt) {
xprt->xprt_sysfs = rpc_xprt;
rpc_xprt->xprt = xprt;
kobject_uevent(&rpc_xprt->kobject, KOBJ_ADD);
}
}
void rpc_sysfs_client_destroy(struct rpc_clnt *clnt)
{
struct rpc_sysfs_client *rpc_client = clnt->cl_sysfs;
if (rpc_client) {
char name[] = "switch";
sysfs_remove_link(&rpc_client->kobject, name);
kobject_uevent(&rpc_client->kobject, KOBJ_REMOVE);
kobject_del(&rpc_client->kobject);
kobject_put(&rpc_client->kobject);
clnt->cl_sysfs = NULL;
}
}
void rpc_sysfs_xprt_switch_destroy(struct rpc_xprt_switch *xprt_switch)
{
struct rpc_sysfs_xprt_switch *rpc_xprt_switch = xprt_switch->xps_sysfs;
if (rpc_xprt_switch) {
kobject_uevent(&rpc_xprt_switch->kobject, KOBJ_REMOVE);
kobject_del(&rpc_xprt_switch->kobject);
kobject_put(&rpc_xprt_switch->kobject);
xprt_switch->xps_sysfs = NULL;
}
}
void rpc_sysfs_xprt_destroy(struct rpc_xprt *xprt)
{
struct rpc_sysfs_xprt *rpc_xprt = xprt->xprt_sysfs;
if (rpc_xprt) {
kobject_uevent(&rpc_xprt->kobject, KOBJ_REMOVE);
kobject_del(&rpc_xprt->kobject);
kobject_put(&rpc_xprt->kobject);
xprt->xprt_sysfs = NULL;
}
}
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