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