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                 count = -EINVAL;
 300                 goto out_put;
 301         }
 302
 303         if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) {
 304                 count = -EINTR;
 305                 goto out_put;
 306         }
 307         if (xprt->main) {
 308                 count = -EINVAL;
 309                 goto release_tasks;
 310         }
 311         if (offline) {
 312                 if (!test_and_set_bit(XPRT_OFFLINE, &xprt->state)) {
 313                         spin_lock(&xps->xps_lock);
 314                         xps->xps_nactive--;
 315                         spin_unlock(&xps->xps_lock);
 316                 }
 317         } else if (online) {
 318                 if (test_and_clear_bit(XPRT_OFFLINE, &xprt->state)) {
 319                         spin_lock(&xps->xps_lock);
 320                         xps->xps_nactive++;
 321                         spin_unlock(&xps->xps_lock);
 322                 }
 323         } else if (remove) {
 324                 if (test_bit(XPRT_OFFLINE, &xprt->state)) {
 325                         if (!test_and_set_bit(XPRT_REMOVE, &xprt->state)) {
 326                                 xprt_force_disconnect(xprt);
 327                                 if (test_bit(XPRT_CONNECTED, &xprt->state)) {
 328                                         if (!xprt->sending.qlen &&
 329                                             !xprt->pending.qlen &&
 330                                             !xprt->backlog.qlen &&
 331                                             !atomic_long_read(&xprt->queuelen))
 332                                                 rpc_xprt_switch_remove_xprt(xps, xprt);
 333                                 }
 334                         }
 335                 } else {
 336                         count = -EINVAL;
 337                 }
 338         }
 339
 340 release_tasks:
 341         xprt_release_write(xprt, NULL);
 342 out_put:
 343         xprt_put(xprt);
 344         xprt_switch_put(xps);
 345         return count;
 346 }
 347
 348 int rpc_sysfs_init(void)
 349 {
 350         rpc_sunrpc_kset = kset_create_and_add("sunrpc", NULL, kernel_kobj);
 351         if (!rpc_sunrpc_kset)
 352                 return -ENOMEM;
 353         rpc_sunrpc_client_kobj =
 354                 rpc_sysfs_object_alloc("rpc-clients", rpc_sunrpc_kset, NULL);
 355         if (!rpc_sunrpc_client_kobj)
 356                 goto err_client;
 357         rpc_sunrpc_xprt_switch_kobj =
 358                 rpc_sysfs_object_alloc("xprt-switches", rpc_sunrpc_kset, NULL);
 359         if (!rpc_sunrpc_xprt_switch_kobj)
 360                 goto err_switch;
 361         return 0;
 362 err_switch:
 363         kobject_put(rpc_sunrpc_client_kobj);
 364         rpc_sunrpc_client_kobj = NULL;
 365 err_client:
 366         kset_unregister(rpc_sunrpc_kset);
 367         rpc_sunrpc_kset = NULL;
 368         return -ENOMEM;
 369 }
 370
 371 static void rpc_sysfs_client_release(struct kobject *kobj)
 372 {
 373         struct rpc_sysfs_client *c;
 374
 375         c = container_of(kobj, struct rpc_sysfs_client, kobject);
 376         kfree(c);
 377 }
 378
 379 static void rpc_sysfs_xprt_switch_release(struct kobject *kobj)
 380 {
 381         struct rpc_sysfs_xprt_switch *xprt_switch;
 382
 383         xprt_switch = container_of(kobj, struct rpc_sysfs_xprt_switch, kobject);
 384         kfree(xprt_switch);
 385 }
 386
 387 static void rpc_sysfs_xprt_release(struct kobject *kobj)
 388 {
 389         struct rpc_sysfs_xprt *xprt;
 390
 391         xprt = container_of(kobj, struct rpc_sysfs_xprt, kobject);
 392         kfree(xprt);
 393 }
 394
 395 static const void *rpc_sysfs_client_namespace(struct kobject *kobj)
 396 {
 397         return container_of(kobj, struct rpc_sysfs_client, kobject)->net;
 398 }
 399
 400 static const void *rpc_sysfs_xprt_switch_namespace(struct kobject *kobj)
 401 {
 402         return container_of(kobj, struct rpc_sysfs_xprt_switch, kobject)->net;
 403 }
 404
 405 static const void *rpc_sysfs_xprt_namespace(struct kobject *kobj)
 406 {
 407         return container_of(kobj, struct rpc_sysfs_xprt,
 408                             kobject)->xprt->xprt_net;
 409 }
 410
 411 static struct kobj_attribute rpc_sysfs_xprt_dstaddr = __ATTR(dstaddr,
 412         0644, rpc_sysfs_xprt_dstaddr_show, rpc_sysfs_xprt_dstaddr_store);
 413
 414 static struct kobj_attribute rpc_sysfs_xprt_srcaddr = __ATTR(srcaddr,
 415         0644, rpc_sysfs_xprt_srcaddr_show, NULL);
 416
 417 static struct kobj_attribute rpc_sysfs_xprt_info = __ATTR(xprt_info,
 418         0444, rpc_sysfs_xprt_info_show, NULL);
 419
 420 static struct kobj_attribute rpc_sysfs_xprt_change_state = __ATTR(xprt_state,
 421         0644, rpc_sysfs_xprt_state_show, rpc_sysfs_xprt_state_change);
 422
 423 static struct attribute *rpc_sysfs_xprt_attrs[] = {
 424         &rpc_sysfs_xprt_dstaddr.attr,
 425         &rpc_sysfs_xprt_srcaddr.attr,
 426         &rpc_sysfs_xprt_info.attr,
 427         &rpc_sysfs_xprt_change_state.attr,
 428         NULL,
 429 };
 430 ATTRIBUTE_GROUPS(rpc_sysfs_xprt);
 431
 432 static struct kobj_attribute rpc_sysfs_xprt_switch_info =
 433         __ATTR(xprt_switch_info, 0444, rpc_sysfs_xprt_switch_info_show, NULL);
 434
 435 static struct attribute *rpc_sysfs_xprt_switch_attrs[] = {
 436         &rpc_sysfs_xprt_switch_info.attr,
 437         NULL,
 438 };
 439 ATTRIBUTE_GROUPS(rpc_sysfs_xprt_switch);
 440
 441 static struct kobj_type rpc_sysfs_client_type = {
 442         .release = rpc_sysfs_client_release,
 443         .sysfs_ops = &kobj_sysfs_ops,
 444         .namespace = rpc_sysfs_client_namespace,
 445 };
 446
 447 static struct kobj_type rpc_sysfs_xprt_switch_type = {
 448         .release = rpc_sysfs_xprt_switch_release,
 449         .default_groups = rpc_sysfs_xprt_switch_groups,
 450         .sysfs_ops = &kobj_sysfs_ops,
 451         .namespace = rpc_sysfs_xprt_switch_namespace,
 452 };
 453
 454 static struct kobj_type rpc_sysfs_xprt_type = {
 455         .release = rpc_sysfs_xprt_release,
 456         .default_groups = rpc_sysfs_xprt_groups,
 457         .sysfs_ops = &kobj_sysfs_ops,
 458         .namespace = rpc_sysfs_xprt_namespace,
 459 };
 460
 461 void rpc_sysfs_exit(void)
 462 {
 463         kobject_put(rpc_sunrpc_client_kobj);
 464         kobject_put(rpc_sunrpc_xprt_switch_kobj);
 465         kset_unregister(rpc_sunrpc_kset);
 466 }
 467
 468 static struct rpc_sysfs_client *rpc_sysfs_client_alloc(struct kobject *parent,
 469                                                        struct net *net,
 470                                                        int clid)
 471 {
 472         struct rpc_sysfs_client *p;
 473
 474         p = kzalloc(sizeof(*p), GFP_KERNEL);
 475         if (p) {
 476                 p->net = net;
 477                 p->kobject.kset = rpc_sunrpc_kset;
 478                 if (kobject_init_and_add(&p->kobject, &rpc_sysfs_client_type,
 479                                          parent, "clnt-%d", clid) == 0)
 480                         return p;
 481                 kobject_put(&p->kobject);
 482         }
 483         return NULL;
 484 }
 485
 486 static struct rpc_sysfs_xprt_switch *
 487 rpc_sysfs_xprt_switch_alloc(struct kobject *parent,
 488                             struct rpc_xprt_switch *xprt_switch,
 489                             struct net *net,
 490                             gfp_t gfp_flags)
 491 {
 492         struct rpc_sysfs_xprt_switch *p;
 493
 494         p = kzalloc(sizeof(*p), gfp_flags);
 495         if (p) {
 496                 p->net = net;
 497                 p->kobject.kset = rpc_sunrpc_kset;
 498                 if (kobject_init_and_add(&p->kobject,
 499                                          &rpc_sysfs_xprt_switch_type,
 500                                          parent, "switch-%d",
 501                                          xprt_switch->xps_id) == 0)
 502                         return p;
 503                 kobject_put(&p->kobject);
 504         }
 505         return NULL;
 506 }
 507
 508 static struct rpc_sysfs_xprt *rpc_sysfs_xprt_alloc(struct kobject *parent,
 509                                                    struct rpc_xprt *xprt,
 510                                                    gfp_t gfp_flags)
 511 {
 512         struct rpc_sysfs_xprt *p;
 513
 514         p = kzalloc(sizeof(*p), gfp_flags);
 515         if (!p)
 516                 goto out;
 517         p->kobject.kset = rpc_sunrpc_kset;
 518         if (kobject_init_and_add(&p->kobject, &rpc_sysfs_xprt_type,
 519                                  parent, "xprt-%d-%s", xprt->id,
 520                                  xprt->address_strings[RPC_DISPLAY_PROTO]) == 0)
 521                 return p;
 522         kobject_put(&p->kobject);
 523 out:
 524         return NULL;
 525 }
 526
 527 void rpc_sysfs_client_setup(struct rpc_clnt *clnt,
 528                             struct rpc_xprt_switch *xprt_switch,
 529                             struct net *net)
 530 {
 531         struct rpc_sysfs_client *rpc_client;
 532
 533         rpc_client = rpc_sysfs_client_alloc(rpc_sunrpc_client_kobj,
 534                                             net, clnt->cl_clid);
 535         if (rpc_client) {
 536                 char name[] = "switch";
 537                 struct rpc_sysfs_xprt_switch *xswitch =
 538                         (struct rpc_sysfs_xprt_switch *)xprt_switch->xps_sysfs;
 539                 int ret;
 540
 541                 clnt->cl_sysfs = rpc_client;
 542                 rpc_client->clnt = clnt;
 543                 rpc_client->xprt_switch = xprt_switch;
 544                 kobject_uevent(&rpc_client->kobject, KOBJ_ADD);
 545                 ret = sysfs_create_link_nowarn(&rpc_client->kobject,
 546                                                &xswitch->kobject, name);
 547                 if (ret)
 548                         pr_warn("can't create link to %s in sysfs (%d)\n",
 549                                 name, ret);
 550         }
 551 }
 552
 553 void rpc_sysfs_xprt_switch_setup(struct rpc_xprt_switch *xprt_switch,
 554                                  struct rpc_xprt *xprt,
 555                                  gfp_t gfp_flags)
 556 {
 557         struct rpc_sysfs_xprt_switch *rpc_xprt_switch;
 558         struct net *net;
 559
 560         if (xprt_switch->xps_net)
 561                 net = xprt_switch->xps_net;
 562         else
 563                 net = xprt->xprt_net;
 564         rpc_xprt_switch =
 565                 rpc_sysfs_xprt_switch_alloc(rpc_sunrpc_xprt_switch_kobj,
 566                                             xprt_switch, net, gfp_flags);
 567         if (rpc_xprt_switch) {
 568                 xprt_switch->xps_sysfs = rpc_xprt_switch;
 569                 rpc_xprt_switch->xprt_switch = xprt_switch;
 570                 rpc_xprt_switch->xprt = xprt;
 571                 kobject_uevent(&rpc_xprt_switch->kobject, KOBJ_ADD);
 572         }
 573 }
 574
 575 void rpc_sysfs_xprt_setup(struct rpc_xprt_switch *xprt_switch,
 576                           struct rpc_xprt *xprt,
 577                           gfp_t gfp_flags)
 578 {
 579         struct rpc_sysfs_xprt *rpc_xprt;
 580         struct rpc_sysfs_xprt_switch *switch_obj =
 581                 (struct rpc_sysfs_xprt_switch *)xprt_switch->xps_sysfs;
 582
 583         rpc_xprt = rpc_sysfs_xprt_alloc(&switch_obj->kobject, xprt, gfp_flags);
 584         if (rpc_xprt) {
 585                 xprt->xprt_sysfs = rpc_xprt;
 586                 rpc_xprt->xprt = xprt;
 587                 rpc_xprt->xprt_switch = xprt_switch;
 588                 kobject_uevent(&rpc_xprt->kobject, KOBJ_ADD);
 589         }
 590 }
 591
 592 void rpc_sysfs_client_destroy(struct rpc_clnt *clnt)
 593 {
 594         struct rpc_sysfs_client *rpc_client = clnt->cl_sysfs;
 595
 596         if (rpc_client) {
 597                 char name[] = "switch";
 598
 599                 sysfs_remove_link(&rpc_client->kobject, name);
 600                 kobject_uevent(&rpc_client->kobject, KOBJ_REMOVE);
 601                 kobject_del(&rpc_client->kobject);
 602                 kobject_put(&rpc_client->kobject);
 603                 clnt->cl_sysfs = NULL;
 604         }
 605 }
 606
 607 void rpc_sysfs_xprt_switch_destroy(struct rpc_xprt_switch *xprt_switch)
 608 {
 609         struct rpc_sysfs_xprt_switch *rpc_xprt_switch = xprt_switch->xps_sysfs;
 610
 611         if (rpc_xprt_switch) {
 612                 kobject_uevent(&rpc_xprt_switch->kobject, KOBJ_REMOVE);
 613                 kobject_del(&rpc_xprt_switch->kobject);
 614                 kobject_put(&rpc_xprt_switch->kobject);
 615                 xprt_switch->xps_sysfs = NULL;
 616         }
 617 }
 618
 619 void rpc_sysfs_xprt_destroy(struct rpc_xprt *xprt)
 620 {
 621         struct rpc_sysfs_xprt *rpc_xprt = xprt->xprt_sysfs;
 622
 623         if (rpc_xprt) {
 624                 kobject_uevent(&rpc_xprt->kobject, KOBJ_REMOVE);
 625                 kobject_del(&rpc_xprt->kobject);
 626                 kobject_put(&rpc_xprt->kobject);
 627                 xprt->xprt_sysfs = NULL;
 628         }
 629 }