net/sunrpc/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2020 Anna Schumaker <Anna.Schumaker@Netapp.com>
   4  */
   5 #include <linux/sunrpc/clnt.h>
   6 #include <linux/kobject.h>
   7 #include <linux/sunrpc/addr.h>
   8 #include <linux/sunrpc/xprtsock.h>
   9
  10 #include "sysfs.h"
  11
  12 struct xprt_addr {
  13         const char *addr;
  14         struct rcu_head rcu;
  15 };
  16
  17 static void free_xprt_addr(struct rcu_head *head)
  18 {
  19         struct xprt_addr *addr = container_of(head, struct xprt_addr, rcu);
  20
  21         kfree(addr->addr);
  22         kfree(addr);
  23 }
  24
  25 static struct kset *rpc_sunrpc_kset;
  26 static struct kobject *rpc_sunrpc_client_kobj, *rpc_sunrpc_xprt_switch_kobj;
  27
  28 static void rpc_sysfs_object_release(struct kobject *kobj)
  29 {
  30         kfree(kobj);
  31 }
  32
  33 static const struct kobj_ns_type_operations *
  34 rpc_sysfs_object_child_ns_type(struct kobject *kobj)
  35 {
  36         return &net_ns_type_operations;
  37 }
  38
  39 static struct kobj_type rpc_sysfs_object_type = {
  40         .release = rpc_sysfs_object_release,
  41         .sysfs_ops = &kobj_sysfs_ops,
  42         .child_ns_type = rpc_sysfs_object_child_ns_type,
  43 };
  44
  45 static struct kobject *rpc_sysfs_object_alloc(const char *name,
  46                                               struct kset *kset,
  47                                               struct kobject *parent)
  48 {
  49         struct kobject *kobj;
  50
  51         kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
  52         if (kobj) {
  53                 kobj->kset = kset;
  54                 if (kobject_init_and_add(kobj, &rpc_sysfs_object_type,
  55                                          parent, "%s", name) == 0)
  56                         return kobj;
  57                 kobject_put(kobj);
  58         }
  59         return NULL;
  60 }
  61
  62 static inline struct rpc_xprt *
  63 rpc_sysfs_xprt_kobj_get_xprt(struct kobject *kobj)
  64 {
  65         struct rpc_sysfs_xprt *x = container_of(kobj,
  66                 struct rpc_sysfs_xprt, kobject);
  67
  68         return xprt_get(x->xprt);
  69 }
  70
  71 static inline struct rpc_xprt_switch *
  72 rpc_sysfs_xprt_kobj_get_xprt_switch(struct kobject *kobj)
  73 {
  74         struct rpc_sysfs_xprt *x = container_of(kobj,
  75                 struct rpc_sysfs_xprt, kobject);
  76
  77         return xprt_switch_get(x->xprt_switch);
  78 }
  79
  80 static inline struct rpc_xprt_switch *
  81 rpc_sysfs_xprt_switch_kobj_get_xprt(struct kobject *kobj)
  82 {
  83         struct rpc_sysfs_xprt_switch *x = container_of(kobj,
  84                 struct rpc_sysfs_xprt_switch, kobject);
  85
  86         return xprt_switch_get(x->xprt_switch);
  87 }
  88
  89 static ssize_t rpc_sysfs_xprt_dstaddr_show(struct kobject *kobj,
  90                                            struct kobj_attribute *attr,
  91                                            char *buf)
  92 {
  93         struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
  94         ssize_t ret;
  95
  96         if (!xprt)
  97                 return 0;
  98         ret = sprintf(buf, "%s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
  99         xprt_put(xprt);
 100         return ret + 1;
 101 }
 102
 103 static ssize_t rpc_sysfs_xprt_srcaddr_show(struct kobject *kobj,
 104                                            struct kobj_attribute *attr,
 105                                            char *buf)
 106 {
 107         struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
 108         struct sockaddr_storage saddr;
 109         struct sock_xprt *sock;
 110         ssize_t ret = -1;
 111
 112         if (!xprt)
 113                 return 0;
 114
 115         sock = container_of(xprt, struct sock_xprt, xprt);
 116         if (kernel_getsockname(sock->sock, (struct sockaddr *)&saddr) < 0)
 117                 goto out;
 118
 119         ret = sprintf(buf, "%pISc\n", &saddr);
 120 out:
 121         xprt_put(xprt);
 122         return ret + 1;
 123 }
 124
 125 static ssize_t rpc_sysfs_xprt_info_show(struct kobject *kobj,
 126                                         struct kobj_attribute *attr,
 127                                         char *buf)
 128 {
 129         struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
 130         ssize_t ret;
 131
 132         if (!xprt)
 133                 return 0;
 134
 135         ret = sprintf(buf, "last_used=%lu\ncur_cong=%lu\ncong_win=%lu\n"
 136                        "max_num_slots=%u\nmin_num_slots=%u\nnum_reqs=%u\n"
 137                        "binding_q_len=%u\nsending_q_len=%u\npending_q_len=%u\n"
 138                        "backlog_q_len=%u\nmain_xprt=%d\nsrc_port=%u\n"
 139                        "tasks_queuelen=%ld\ndst_port=%s\n",
 140                        xprt->last_used, xprt->cong, xprt->cwnd, xprt->max_reqs,
 141                        xprt->min_reqs, xprt->num_reqs, xprt->binding.qlen,
 142                        xprt->sending.qlen, xprt->pending.qlen,
 143                        xprt->backlog.qlen, xprt->main,
 144                        (xprt->xprt_class->ident == XPRT_TRANSPORT_TCP) ?
 145                        get_srcport(xprt) : 0,
 146                        atomic_long_read(&xprt->queuelen),
 147                        (xprt->xprt_class->ident == XPRT_TRANSPORT_TCP) ?
 148                                 xprt->address_strings[RPC_DISPLAY_PORT] : "0");
 149         xprt_put(xprt);
 150         return ret + 1;
 151 }
 152
 153 static ssize_t rpc_sysfs_xprt_state_show(struct kobject *kobj,
 154                                          struct kobj_attribute *attr,
 155                                          char *buf)
 156 {
 157         struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
 158         ssize_t ret;
 159         int locked, connected, connecting, close_wait, bound, binding,
 160             closing, congested, cwnd_wait, write_space, offline, remove;
 161
 162         if (!xprt)
 163                 return 0;
 164
 165         if (!xprt->state) {
 166                 ret = sprintf(buf, "state=CLOSED\n");
 167         } else {
 168                 locked = test_bit(XPRT_LOCKED, &xprt->state);
 169                 connected = test_bit(XPRT_CONNECTED, &xprt->state);
 170                 connecting = test_bit(XPRT_CONNECTING, &xprt->state);
 171                 close_wait = test_bit(XPRT_CLOSE_WAIT, &xprt->state);
 172                 bound = test_bit(XPRT_BOUND, &xprt->state);
 173                 binding = test_bit(XPRT_BINDING, &xprt->state);
 174                 closing = test_bit(XPRT_CLOSING, &xprt->state);
 175                 congested = test_bit(XPRT_CONGESTED, &xprt->state);
 176                 cwnd_wait = test_bit(XPRT_CWND_WAIT, &xprt->state);
 177                 write_space = test_bit(XPRT_WRITE_SPACE, &xprt->state);
 178                 offline = test_bit(XPRT_OFFLINE, &xprt->state);
 179                 remove = test_bit(XPRT_REMOVE, &xprt->state);
 180
 181                 ret = sprintf(buf, "state=%s %s %s %s %s %s %s %s %s %s %s %s\n",
 182                               locked ? "LOCKED" : "",
 183                               connected ? "CONNECTED" : "",
 184                               connecting ? "CONNECTING" : "",
 185                               close_wait ? "CLOSE_WAIT" : "",
 186                               bound ? "BOUND" : "",
 187                               binding ? "BOUNDING" : "",
 188                               closing ? "CLOSING" : "",
 189                               congested ? "CONGESTED" : "",
 190                               cwnd_wait ? "CWND_WAIT" : "",
 191                               write_space ? "WRITE_SPACE" : "",
 192                               offline ? "OFFLINE" : "",
 193                               remove ? "REMOVE" : "");
 194         }
 195
 196         xprt_put(xprt);
 197         return ret + 1;
 198 }
 199
 200 static ssize_t rpc_sysfs_xprt_switch_info_show(struct kobject *kobj,
 201                                                struct kobj_attribute *attr,
 202                                                char *buf)
 203 {
 204         struct rpc_xprt_switch *xprt_switch =
 205                 rpc_sysfs_xprt_switch_kobj_get_xprt(kobj);
 206         ssize_t ret;
 207
 208         if (!xprt_switch)
 209                 return 0;
 210         ret = sprintf(buf, "num_xprts=%u\nnum_active=%u\n"
 211                       "num_unique_destaddr=%u\nqueue_len=%ld\n",
 212                       xprt_switch->xps_nxprts, xprt_switch->xps_nactive,
 213                       xprt_switch->xps_nunique_destaddr_xprts,
 214                       atomic_long_read(&xprt_switch->xps_queuelen));
 215         xprt_switch_put(xprt_switch);
 216         return ret + 1;
 217 }
 218
 219 static ssize_t rpc_sysfs_xprt_dstaddr_store(struct kobject *kobj,
 220                                             struct kobj_attribute *attr,
 221                                             const char *buf, size_t count)
 222 {
 223         struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
 224         struct sockaddr *saddr;
 225         char *dst_addr;
 226         int port;
 227         struct xprt_addr *saved_addr;
 228         size_t buf_len;
 229
 230         if (!xprt)
 231                 return 0;
 232         if (!(xprt->xprt_class->ident == XPRT_TRANSPORT_TCP ||
 233               xprt->xprt_class->ident == XPRT_TRANSPORT_RDMA)) {
 234                 xprt_put(xprt);
 235                 return -EOPNOTSUPP;
 236         }
 237
 238         if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) {
 239                 count = -EINTR;
 240                 goto out_put;
 241         }
 242         saddr = (struct sockaddr *)&xprt->addr;
 243         port = rpc_get_port(saddr);
 244
 245         /* buf_len is the len until the first occurence of either
 246          * '\n' or '\0'
 247          */
 248         buf_len = strcspn(buf, "\n");
 249
 250         dst_addr = kstrndup(buf, buf_len, GFP_KERNEL);
 251         if (!dst_addr)
 252                 goto out_err;
 253         saved_addr = kzalloc(sizeof(*saved_addr), GFP_KERNEL);
 254         if (!saved_addr)
 255                 goto out_err_free;
 256         saved_addr->addr =
 257                 rcu_dereference_raw(xprt->address_strings[RPC_DISPLAY_ADDR]);
 258         rcu_assign_pointer(xprt->address_strings[RPC_DISPLAY_ADDR], dst_addr);
 259         call_rcu(&saved_addr->rcu, free_xprt_addr);
 260         xprt->addrlen = rpc_pton(xprt->xprt_net, buf, buf_len, saddr,
 261                                  sizeof(*saddr));
 262         rpc_set_port(saddr, port);
 263
 264         xprt_force_disconnect(xprt);
 265 out:
 266         xprt_release_write(xprt, NULL);
 267 out_put:
 268         xprt_put(xprt);
 269         return count;
 270 out_err_free:
 271         kfree(dst_addr);
 272 out_err:
 273         count = -ENOMEM;
 274         goto out;
 275 }
 276
 277 static ssize_t rpc_sysfs_xprt_state_change(struct kobject *kobj,
 278                                            struct kobj_attribute *attr,
 279                                            const char *buf, size_t count)
 280 {
 281         struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
 282         int offline = 0, online = 0, remove = 0;
 283         struct rpc_xprt_switch *xps = rpc_sysfs_xprt_kobj_get_xprt_switch(kobj);
 284
 285         if (!xprt || !xps) {
 286                 count = 0;
 287                 goto out_put;
 288         }
 289
 290         if (!strncmp(buf, "offline", 7))
 291                 offline = 1;
 292         else if (!strncmp(buf, "online", 6))
 293                 online = 1;
 294         else if (!strncmp(buf, "remove", 6))
 295                 remove = 1;
 296         else {
 297                 count = -EINVAL;
 298                 goto out_put;
 299         }
 300
 301         if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) {
 302                 count = -EINTR;
 303                 goto out_put;
 304         }
 305         if (xprt->main) {
 306                 count = -EINVAL;
 307                 goto release_tasks;
 308         }
 309         if (offline) {
 310                 if (!test_and_set_bit(XPRT_OFFLINE, &xprt->state)) {
 311                         spin_lock(&xps->xps_lock);
 312                         xps->xps_nactive--;
 313                         spin_unlock(&xps->xps_lock);
 314                 }
 315         } else if (online) {
 316                 if (test_and_clear_bit(XPRT_OFFLINE, &xprt->state)) {
 317                         spin_lock(&xps->xps_lock);
 318                         xps->xps_nactive++;
 319                         spin_unlock(&xps->xps_lock);
 320                 }
 321         } else if (remove) {
 322                 if (test_bit(XPRT_OFFLINE, &xprt->state)) {
 323                         if (!test_and_set_bit(XPRT_REMOVE, &xprt->state)) {
 324                                 xprt_force_disconnect(xprt);
 325                                 if (test_bit(XPRT_CONNECTED, &xprt->state)) {
 326                                         if (!xprt->sending.qlen &&
 327                                             !xprt->pending.qlen &&
 328                                             !xprt->backlog.qlen &&
 329                                             !atomic_long_read(&xprt->queuelen))
 330                                                 rpc_xprt_switch_remove_xprt(xps, xprt);
 331                                 }
 332                         }
 333                 } else {
 334                         count = -EINVAL;
 335                 }
 336         }
 337
 338 release_tasks:
 339         xprt_release_write(xprt, NULL);
 340 out_put:
 341         xprt_put(xprt);
 342         xprt_switch_put(xps);
 343         return count;
 344 }
 345
 346 int rpc_sysfs_init(void)
 347 {
 348         rpc_sunrpc_kset = kset_create_and_add("sunrpc", NULL, kernel_kobj);
 349         if (!rpc_sunrpc_kset)
 350                 return -ENOMEM;
 351         rpc_sunrpc_client_kobj =
 352                 rpc_sysfs_object_alloc("rpc-clients", rpc_sunrpc_kset, NULL);
 353         if (!rpc_sunrpc_client_kobj)
 354                 goto err_client;
 355         rpc_sunrpc_xprt_switch_kobj =
 356                 rpc_sysfs_object_alloc("xprt-switches", rpc_sunrpc_kset, NULL);
 357         if (!rpc_sunrpc_xprt_switch_kobj)
 358                 goto err_switch;
 359         return 0;
 360 err_switch:
 361         kobject_put(rpc_sunrpc_client_kobj);
 362         rpc_sunrpc_client_kobj = NULL;
 363 err_client:
 364         kset_unregister(rpc_sunrpc_kset);
 365         rpc_sunrpc_kset = NULL;
 366         return -ENOMEM;
 367 }
 368
 369 static void rpc_sysfs_client_release(struct kobject *kobj)
 370 {
 371         struct rpc_sysfs_client *c;
 372
 373         c = container_of(kobj, struct rpc_sysfs_client, kobject);
 374         kfree(c);
 375 }
 376
 377 static void rpc_sysfs_xprt_switch_release(struct kobject *kobj)
 378 {
 379         struct rpc_sysfs_xprt_switch *xprt_switch;
 380
 381         xprt_switch = container_of(kobj, struct rpc_sysfs_xprt_switch, kobject);
 382         kfree(xprt_switch);
 383 }
 384
 385 static void rpc_sysfs_xprt_release(struct kobject *kobj)
 386 {
 387         struct rpc_sysfs_xprt *xprt;
 388
 389         xprt = container_of(kobj, struct rpc_sysfs_xprt, kobject);
 390         kfree(xprt);
 391 }
 392
 393 static const void *rpc_sysfs_client_namespace(struct kobject *kobj)
 394 {
 395         return container_of(kobj, struct rpc_sysfs_client, kobject)->net;
 396 }
 397
 398 static const void *rpc_sysfs_xprt_switch_namespace(struct kobject *kobj)
 399 {
 400         return container_of(kobj, struct rpc_sysfs_xprt_switch, kobject)->net;
 401 }
 402
 403 static const void *rpc_sysfs_xprt_namespace(struct kobject *kobj)
 404 {
 405         return container_of(kobj, struct rpc_sysfs_xprt,
 406                             kobject)->xprt->xprt_net;
 407 }
 408
 409 static struct kobj_attribute rpc_sysfs_xprt_dstaddr = __ATTR(dstaddr,
 410         0644, rpc_sysfs_xprt_dstaddr_show, rpc_sysfs_xprt_dstaddr_store);
 411
 412 static struct kobj_attribute rpc_sysfs_xprt_srcaddr = __ATTR(srcaddr,
 413         0644, rpc_sysfs_xprt_srcaddr_show, NULL);
 414
 415 static struct kobj_attribute rpc_sysfs_xprt_info = __ATTR(xprt_info,
 416         0444, rpc_sysfs_xprt_info_show, NULL);
 417
 418 static struct kobj_attribute rpc_sysfs_xprt_change_state = __ATTR(xprt_state,
 419         0644, rpc_sysfs_xprt_state_show, rpc_sysfs_xprt_state_change);
 420
 421 static struct attribute *rpc_sysfs_xprt_attrs[] = {
 422         &rpc_sysfs_xprt_dstaddr.attr,
 423         &rpc_sysfs_xprt_srcaddr.attr,
 424         &rpc_sysfs_xprt_info.attr,
 425         &rpc_sysfs_xprt_change_state.attr,
 426         NULL,
 427 };
 428
 429 static struct kobj_attribute rpc_sysfs_xprt_switch_info =
 430         __ATTR(xprt_switch_info, 0444, rpc_sysfs_xprt_switch_info_show, NULL);
 431
 432 static struct attribute *rpc_sysfs_xprt_switch_attrs[] = {
 433         &rpc_sysfs_xprt_switch_info.attr,
 434         NULL,
 435 };
 436
 437 static struct kobj_type rpc_sysfs_client_type = {
 438         .release = rpc_sysfs_client_release,
 439         .sysfs_ops = &kobj_sysfs_ops,
 440         .namespace = rpc_sysfs_client_namespace,
 441 };
 442
 443 static struct kobj_type rpc_sysfs_xprt_switch_type = {
 444         .release = rpc_sysfs_xprt_switch_release,
 445         .default_attrs = rpc_sysfs_xprt_switch_attrs,
 446         .sysfs_ops = &kobj_sysfs_ops,
 447         .namespace = rpc_sysfs_xprt_switch_namespace,
 448 };
 449
 450 static struct kobj_type rpc_sysfs_xprt_type = {
 451         .release = rpc_sysfs_xprt_release,
 452         .default_attrs = rpc_sysfs_xprt_attrs,
 453         .sysfs_ops = &kobj_sysfs_ops,
 454         .namespace = rpc_sysfs_xprt_namespace,
 455 };
 456
 457 void rpc_sysfs_exit(void)
 458 {
 459         kobject_put(rpc_sunrpc_client_kobj);
 460         kobject_put(rpc_sunrpc_xprt_switch_kobj);
 461         kset_unregister(rpc_sunrpc_kset);
 462 }
 463
 464 static struct rpc_sysfs_client *rpc_sysfs_client_alloc(struct kobject *parent,
 465                                                        struct net *net,
 466                                                        int clid)
 467 {
 468         struct rpc_sysfs_client *p;
 469
 470         p = kzalloc(sizeof(*p), GFP_KERNEL);
 471         if (p) {
 472                 p->net = net;
 473                 p->kobject.kset = rpc_sunrpc_kset;
 474                 if (kobject_init_and_add(&p->kobject, &rpc_sysfs_client_type,
 475                                          parent, "clnt-%d", clid) == 0)
 476                         return p;
 477                 kobject_put(&p->kobject);
 478         }
 479         return NULL;
 480 }
 481
 482 static struct rpc_sysfs_xprt_switch *
 483 rpc_sysfs_xprt_switch_alloc(struct kobject *parent,
 484                             struct rpc_xprt_switch *xprt_switch,
 485                             struct net *net,
 486                             gfp_t gfp_flags)
 487 {
 488         struct rpc_sysfs_xprt_switch *p;
 489
 490         p = kzalloc(sizeof(*p), gfp_flags);
 491         if (p) {
 492                 p->net = net;
 493                 p->kobject.kset = rpc_sunrpc_kset;
 494                 if (kobject_init_and_add(&p->kobject,
 495                                          &rpc_sysfs_xprt_switch_type,
 496                                          parent, "switch-%d",
 497                                          xprt_switch->xps_id) == 0)
 498                         return p;
 499                 kobject_put(&p->kobject);
 500         }
 501         return NULL;
 502 }
 503
 504 static struct rpc_sysfs_xprt *rpc_sysfs_xprt_alloc(struct kobject *parent,
 505                                                    struct rpc_xprt *xprt,
 506                                                    gfp_t gfp_flags)
 507 {
 508         struct rpc_sysfs_xprt *p;
 509
 510         p = kzalloc(sizeof(*p), gfp_flags);
 511         if (!p)
 512                 goto out;
 513         p->kobject.kset = rpc_sunrpc_kset;
 514         if (kobject_init_and_add(&p->kobject, &rpc_sysfs_xprt_type,
 515                                  parent, "xprt-%d-%s", xprt->id,
 516                                  xprt->address_strings[RPC_DISPLAY_PROTO]) == 0)
 517                 return p;
 518         kobject_put(&p->kobject);
 519 out:
 520         return NULL;
 521 }
 522
 523 void rpc_sysfs_client_setup(struct rpc_clnt *clnt,
 524                             struct rpc_xprt_switch *xprt_switch,
 525                             struct net *net)
 526 {
 527         struct rpc_sysfs_client *rpc_client;
 528         struct rpc_sysfs_xprt_switch *xswitch =
 529                 (struct rpc_sysfs_xprt_switch *)xprt_switch->xps_sysfs;
 530
 531         if (!xswitch)
 532                 return;
 533
 534         rpc_client = rpc_sysfs_client_alloc(rpc_sunrpc_client_kobj,
 535                                             net, clnt->cl_clid);
 536         if (rpc_client) {
 537                 char name[] = "switch";
 538                 int ret;
 539
 540                 clnt->cl_sysfs = rpc_client;
 541                 rpc_client->clnt = clnt;
 542                 rpc_client->xprt_switch = xprt_switch;
 543                 kobject_uevent(&rpc_client->kobject, KOBJ_ADD);
 544                 ret = sysfs_create_link_nowarn(&rpc_client->kobject,
 545                                                &xswitch->kobject, name);
 546                 if (ret)
 547                         pr_warn("can't create link to %s in sysfs (%d)\n",
 548                                 name, ret);
 549         }
 550 }
 551
 552 void rpc_sysfs_xprt_switch_setup(struct rpc_xprt_switch *xprt_switch,
 553                                  struct rpc_xprt *xprt,
 554                                  gfp_t gfp_flags)
 555 {
 556         struct rpc_sysfs_xprt_switch *rpc_xprt_switch;
 557         struct net *net;
 558
 559         if (xprt_switch->xps_net)
 560                 net = xprt_switch->xps_net;
 561         else
 562                 net = xprt->xprt_net;
 563         rpc_xprt_switch =
 564                 rpc_sysfs_xprt_switch_alloc(rpc_sunrpc_xprt_switch_kobj,
 565                                             xprt_switch, net, gfp_flags);
 566         if (rpc_xprt_switch) {
 567                 xprt_switch->xps_sysfs = rpc_xprt_switch;
 568                 rpc_xprt_switch->xprt_switch = xprt_switch;
 569                 rpc_xprt_switch->xprt = xprt;
 570                 kobject_uevent(&rpc_xprt_switch->kobject, KOBJ_ADD);
 571         } else {
 572                 xprt_switch->xps_sysfs = NULL;
 573         }
 574 }
 575
 576 void rpc_sysfs_xprt_setup(struct rpc_xprt_switch *xprt_switch,
 577                           struct rpc_xprt *xprt,
 578                           gfp_t gfp_flags)
 579 {
 580         struct rpc_sysfs_xprt *rpc_xprt;
 581         struct rpc_sysfs_xprt_switch *switch_obj =
 582                 (struct rpc_sysfs_xprt_switch *)xprt_switch->xps_sysfs;
 583
 584         if (!switch_obj)
 585                 return;
 586
 587         rpc_xprt = rpc_sysfs_xprt_alloc(&switch_obj->kobject, xprt, gfp_flags);
 588         if (rpc_xprt) {
 589                 xprt->xprt_sysfs = rpc_xprt;
 590                 rpc_xprt->xprt = xprt;
 591                 rpc_xprt->xprt_switch = xprt_switch;
 592                 kobject_uevent(&rpc_xprt->kobject, KOBJ_ADD);
 593         }
 594 }
 595
 596 void rpc_sysfs_client_destroy(struct rpc_clnt *clnt)
 597 {
 598         struct rpc_sysfs_client *rpc_client = clnt->cl_sysfs;
 599
 600         if (rpc_client) {
 601                 char name[] = "switch";
 602
 603                 sysfs_remove_link(&rpc_client->kobject, name);
 604                 kobject_uevent(&rpc_client->kobject, KOBJ_REMOVE);
 605                 kobject_del(&rpc_client->kobject);
 606                 kobject_put(&rpc_client->kobject);
 607                 clnt->cl_sysfs = NULL;
 608         }
 609 }
 610
 611 void rpc_sysfs_xprt_switch_destroy(struct rpc_xprt_switch *xprt_switch)
 612 {
 613         struct rpc_sysfs_xprt_switch *rpc_xprt_switch = xprt_switch->xps_sysfs;
 614
 615         if (rpc_xprt_switch) {
 616                 kobject_uevent(&rpc_xprt_switch->kobject, KOBJ_REMOVE);
 617                 kobject_del(&rpc_xprt_switch->kobject);
 618                 kobject_put(&rpc_xprt_switch->kobject);
 619                 xprt_switch->xps_sysfs = NULL;
 620         }
 621 }
 622
 623 void rpc_sysfs_xprt_destroy(struct rpc_xprt *xprt)
 624 {
 625         struct rpc_sysfs_xprt *rpc_xprt = xprt->xprt_sysfs;
 626
 627         if (rpc_xprt) {
 628                 kobject_uevent(&rpc_xprt->kobject, KOBJ_REMOVE);
 629                 kobject_del(&rpc_xprt->kobject);
 630                 kobject_put(&rpc_xprt->kobject);
 631                 xprt->xprt_sysfs = NULL;
 632         }
 633 }