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