| 1 | /* |
| 2 | * linux/fs/9p/v9fs.c |
| 3 | * |
| 4 | * This file contains functions assisting in mapping VFS to 9P2000 |
| 5 | * |
| 6 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
| 7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 |
| 11 | * as published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to: |
| 20 | * Free Software Foundation |
| 21 | * 51 Franklin Street, Fifth Floor |
| 22 | * Boston, MA 02111-1301 USA |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <linux/sched.h> |
| 30 | #include <linux/parser.h> |
| 31 | #include <linux/idr.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <net/9p/9p.h> |
| 34 | #include <net/9p/client.h> |
| 35 | #include <net/9p/transport.h> |
| 36 | #include "v9fs.h" |
| 37 | #include "v9fs_vfs.h" |
| 38 | #include "cache.h" |
| 39 | |
| 40 | static DEFINE_SPINLOCK(v9fs_sessionlist_lock); |
| 41 | static LIST_HEAD(v9fs_sessionlist); |
| 42 | struct kmem_cache *v9fs_inode_cache; |
| 43 | |
| 44 | /* |
| 45 | * Option Parsing (code inspired by NFS code) |
| 46 | * NOTE: each transport will parse its own options |
| 47 | */ |
| 48 | |
| 49 | enum { |
| 50 | /* Options that take integer arguments */ |
| 51 | Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
| 52 | /* String options */ |
| 53 | Opt_uname, Opt_remotename, Opt_trans, Opt_cache, Opt_cachetag, |
| 54 | /* Options that take no arguments */ |
| 55 | Opt_nodevmap, |
| 56 | /* Cache options */ |
| 57 | Opt_cache_loose, Opt_fscache, |
| 58 | /* Access options */ |
| 59 | Opt_access, Opt_posixacl, |
| 60 | /* Error token */ |
| 61 | Opt_err |
| 62 | }; |
| 63 | |
| 64 | static const match_table_t tokens = { |
| 65 | {Opt_debug, "debug=%x"}, |
| 66 | {Opt_dfltuid, "dfltuid=%u"}, |
| 67 | {Opt_dfltgid, "dfltgid=%u"}, |
| 68 | {Opt_afid, "afid=%u"}, |
| 69 | {Opt_uname, "uname=%s"}, |
| 70 | {Opt_remotename, "aname=%s"}, |
| 71 | {Opt_nodevmap, "nodevmap"}, |
| 72 | {Opt_cache, "cache=%s"}, |
| 73 | {Opt_cache_loose, "loose"}, |
| 74 | {Opt_fscache, "fscache"}, |
| 75 | {Opt_cachetag, "cachetag=%s"}, |
| 76 | {Opt_access, "access=%s"}, |
| 77 | {Opt_posixacl, "posixacl"}, |
| 78 | {Opt_err, NULL} |
| 79 | }; |
| 80 | |
| 81 | /** |
| 82 | * v9fs_parse_options - parse mount options into session structure |
| 83 | * @v9ses: existing v9fs session information |
| 84 | * |
| 85 | * Return 0 upon success, -ERRNO upon failure. |
| 86 | */ |
| 87 | |
| 88 | static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
| 89 | { |
| 90 | char *options, *tmp_options; |
| 91 | substring_t args[MAX_OPT_ARGS]; |
| 92 | char *p; |
| 93 | int option = 0; |
| 94 | char *s, *e; |
| 95 | int ret = 0; |
| 96 | |
| 97 | /* setup defaults */ |
| 98 | v9ses->afid = ~0; |
| 99 | v9ses->debug = 0; |
| 100 | v9ses->cache = 0; |
| 101 | #ifdef CONFIG_9P_FSCACHE |
| 102 | v9ses->cachetag = NULL; |
| 103 | #endif |
| 104 | |
| 105 | if (!opts) |
| 106 | return 0; |
| 107 | |
| 108 | tmp_options = kstrdup(opts, GFP_KERNEL); |
| 109 | if (!tmp_options) { |
| 110 | ret = -ENOMEM; |
| 111 | goto fail_option_alloc; |
| 112 | } |
| 113 | options = tmp_options; |
| 114 | |
| 115 | while ((p = strsep(&options, ",")) != NULL) { |
| 116 | int token; |
| 117 | if (!*p) |
| 118 | continue; |
| 119 | token = match_token(p, tokens, args); |
| 120 | if (token < Opt_uname) { |
| 121 | int r = match_int(&args[0], &option); |
| 122 | if (r < 0) { |
| 123 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 124 | "integer field, but no integer?\n"); |
| 125 | ret = r; |
| 126 | continue; |
| 127 | } |
| 128 | } |
| 129 | switch (token) { |
| 130 | case Opt_debug: |
| 131 | v9ses->debug = option; |
| 132 | #ifdef CONFIG_NET_9P_DEBUG |
| 133 | p9_debug_level = option; |
| 134 | #endif |
| 135 | break; |
| 136 | |
| 137 | case Opt_dfltuid: |
| 138 | v9ses->dfltuid = option; |
| 139 | break; |
| 140 | case Opt_dfltgid: |
| 141 | v9ses->dfltgid = option; |
| 142 | break; |
| 143 | case Opt_afid: |
| 144 | v9ses->afid = option; |
| 145 | break; |
| 146 | case Opt_uname: |
| 147 | match_strlcpy(v9ses->uname, &args[0], PATH_MAX); |
| 148 | break; |
| 149 | case Opt_remotename: |
| 150 | match_strlcpy(v9ses->aname, &args[0], PATH_MAX); |
| 151 | break; |
| 152 | case Opt_nodevmap: |
| 153 | v9ses->nodev = 1; |
| 154 | break; |
| 155 | case Opt_cache_loose: |
| 156 | v9ses->cache = CACHE_LOOSE; |
| 157 | break; |
| 158 | case Opt_fscache: |
| 159 | v9ses->cache = CACHE_FSCACHE; |
| 160 | break; |
| 161 | case Opt_cachetag: |
| 162 | #ifdef CONFIG_9P_FSCACHE |
| 163 | v9ses->cachetag = match_strdup(&args[0]); |
| 164 | #endif |
| 165 | break; |
| 166 | case Opt_cache: |
| 167 | s = match_strdup(&args[0]); |
| 168 | if (!s) { |
| 169 | ret = -ENOMEM; |
| 170 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 171 | "problem allocating copy of cache arg\n"); |
| 172 | goto free_and_return; |
| 173 | } |
| 174 | |
| 175 | if (strcmp(s, "loose") == 0) |
| 176 | v9ses->cache = CACHE_LOOSE; |
| 177 | else if (strcmp(s, "fscache") == 0) |
| 178 | v9ses->cache = CACHE_FSCACHE; |
| 179 | else |
| 180 | v9ses->cache = CACHE_NONE; |
| 181 | kfree(s); |
| 182 | break; |
| 183 | |
| 184 | case Opt_access: |
| 185 | s = match_strdup(&args[0]); |
| 186 | if (!s) { |
| 187 | ret = -ENOMEM; |
| 188 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 189 | "problem allocating copy of access arg\n"); |
| 190 | goto free_and_return; |
| 191 | } |
| 192 | |
| 193 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 194 | if (strcmp(s, "user") == 0) |
| 195 | v9ses->flags |= V9FS_ACCESS_USER; |
| 196 | else if (strcmp(s, "any") == 0) |
| 197 | v9ses->flags |= V9FS_ACCESS_ANY; |
| 198 | else if (strcmp(s, "client") == 0) { |
| 199 | v9ses->flags |= V9FS_ACCESS_CLIENT; |
| 200 | } else { |
| 201 | v9ses->flags |= V9FS_ACCESS_SINGLE; |
| 202 | v9ses->uid = simple_strtoul(s, &e, 10); |
| 203 | if (*e != '\0') |
| 204 | v9ses->uid = ~0; |
| 205 | } |
| 206 | kfree(s); |
| 207 | break; |
| 208 | |
| 209 | case Opt_posixacl: |
| 210 | #ifdef CONFIG_9P_FS_POSIX_ACL |
| 211 | v9ses->flags |= V9FS_POSIX_ACL; |
| 212 | #else |
| 213 | P9_DPRINTK(P9_DEBUG_ERROR, |
| 214 | "Not defined CONFIG_9P_FS_POSIX_ACL. " |
| 215 | "Ignoring posixacl option\n"); |
| 216 | #endif |
| 217 | break; |
| 218 | |
| 219 | default: |
| 220 | continue; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | free_and_return: |
| 225 | kfree(tmp_options); |
| 226 | fail_option_alloc: |
| 227 | return ret; |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * v9fs_session_init - initialize session |
| 232 | * @v9ses: session information structure |
| 233 | * @dev_name: device being mounted |
| 234 | * @data: options |
| 235 | * |
| 236 | */ |
| 237 | |
| 238 | struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
| 239 | const char *dev_name, char *data) |
| 240 | { |
| 241 | int retval = -EINVAL; |
| 242 | struct p9_fid *fid; |
| 243 | int rc; |
| 244 | |
| 245 | v9ses->uname = __getname(); |
| 246 | if (!v9ses->uname) |
| 247 | return ERR_PTR(-ENOMEM); |
| 248 | |
| 249 | v9ses->aname = __getname(); |
| 250 | if (!v9ses->aname) { |
| 251 | __putname(v9ses->uname); |
| 252 | return ERR_PTR(-ENOMEM); |
| 253 | } |
| 254 | init_rwsem(&v9ses->rename_sem); |
| 255 | |
| 256 | rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY); |
| 257 | if (rc) { |
| 258 | __putname(v9ses->aname); |
| 259 | __putname(v9ses->uname); |
| 260 | return ERR_PTR(rc); |
| 261 | } |
| 262 | |
| 263 | spin_lock(&v9fs_sessionlist_lock); |
| 264 | list_add(&v9ses->slist, &v9fs_sessionlist); |
| 265 | spin_unlock(&v9fs_sessionlist_lock); |
| 266 | |
| 267 | strcpy(v9ses->uname, V9FS_DEFUSER); |
| 268 | strcpy(v9ses->aname, V9FS_DEFANAME); |
| 269 | v9ses->uid = ~0; |
| 270 | v9ses->dfltuid = V9FS_DEFUID; |
| 271 | v9ses->dfltgid = V9FS_DEFGID; |
| 272 | |
| 273 | v9ses->clnt = p9_client_create(dev_name, data); |
| 274 | if (IS_ERR(v9ses->clnt)) { |
| 275 | retval = PTR_ERR(v9ses->clnt); |
| 276 | v9ses->clnt = NULL; |
| 277 | P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n"); |
| 278 | goto error; |
| 279 | } |
| 280 | |
| 281 | v9ses->flags = V9FS_ACCESS_USER; |
| 282 | |
| 283 | if (p9_is_proto_dotl(v9ses->clnt)) { |
| 284 | v9ses->flags = V9FS_ACCESS_CLIENT; |
| 285 | v9ses->flags |= V9FS_PROTO_2000L; |
| 286 | } else if (p9_is_proto_dotu(v9ses->clnt)) { |
| 287 | v9ses->flags |= V9FS_PROTO_2000U; |
| 288 | } |
| 289 | |
| 290 | rc = v9fs_parse_options(v9ses, data); |
| 291 | if (rc < 0) { |
| 292 | retval = rc; |
| 293 | goto error; |
| 294 | } |
| 295 | |
| 296 | v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
| 297 | |
| 298 | if (!v9fs_proto_dotl(v9ses) && |
| 299 | ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { |
| 300 | /* |
| 301 | * We support ACCESS_CLIENT only for dotl. |
| 302 | * Fall back to ACCESS_USER |
| 303 | */ |
| 304 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 305 | v9ses->flags |= V9FS_ACCESS_USER; |
| 306 | } |
| 307 | /*FIXME !! */ |
| 308 | /* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
| 309 | if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
| 310 | ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
| 311 | |
| 312 | v9ses->flags &= ~V9FS_ACCESS_MASK; |
| 313 | v9ses->flags |= V9FS_ACCESS_ANY; |
| 314 | v9ses->uid = ~0; |
| 315 | } |
| 316 | if (!v9fs_proto_dotl(v9ses) || |
| 317 | !((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { |
| 318 | /* |
| 319 | * We support ACL checks on clinet only if the protocol is |
| 320 | * 9P2000.L and access is V9FS_ACCESS_CLIENT. |
| 321 | */ |
| 322 | v9ses->flags &= ~V9FS_ACL_MASK; |
| 323 | } |
| 324 | |
| 325 | fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, |
| 326 | v9ses->aname); |
| 327 | if (IS_ERR(fid)) { |
| 328 | retval = PTR_ERR(fid); |
| 329 | fid = NULL; |
| 330 | P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n"); |
| 331 | goto error; |
| 332 | } |
| 333 | |
| 334 | if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
| 335 | fid->uid = v9ses->uid; |
| 336 | else |
| 337 | fid->uid = ~0; |
| 338 | |
| 339 | #ifdef CONFIG_9P_FSCACHE |
| 340 | /* register the session for caching */ |
| 341 | v9fs_cache_session_get_cookie(v9ses); |
| 342 | #endif |
| 343 | |
| 344 | return fid; |
| 345 | |
| 346 | error: |
| 347 | bdi_destroy(&v9ses->bdi); |
| 348 | return ERR_PTR(retval); |
| 349 | } |
| 350 | |
| 351 | /** |
| 352 | * v9fs_session_close - shutdown a session |
| 353 | * @v9ses: session information structure |
| 354 | * |
| 355 | */ |
| 356 | |
| 357 | void v9fs_session_close(struct v9fs_session_info *v9ses) |
| 358 | { |
| 359 | if (v9ses->clnt) { |
| 360 | p9_client_destroy(v9ses->clnt); |
| 361 | v9ses->clnt = NULL; |
| 362 | } |
| 363 | |
| 364 | #ifdef CONFIG_9P_FSCACHE |
| 365 | if (v9ses->fscache) { |
| 366 | v9fs_cache_session_put_cookie(v9ses); |
| 367 | kfree(v9ses->cachetag); |
| 368 | } |
| 369 | #endif |
| 370 | __putname(v9ses->uname); |
| 371 | __putname(v9ses->aname); |
| 372 | |
| 373 | bdi_destroy(&v9ses->bdi); |
| 374 | |
| 375 | spin_lock(&v9fs_sessionlist_lock); |
| 376 | list_del(&v9ses->slist); |
| 377 | spin_unlock(&v9fs_sessionlist_lock); |
| 378 | } |
| 379 | |
| 380 | /** |
| 381 | * v9fs_session_cancel - terminate a session |
| 382 | * @v9ses: session to terminate |
| 383 | * |
| 384 | * mark transport as disconnected and cancel all pending requests. |
| 385 | */ |
| 386 | |
| 387 | void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
| 388 | P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
| 389 | p9_client_disconnect(v9ses->clnt); |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * v9fs_session_begin_cancel - Begin terminate of a session |
| 394 | * @v9ses: session to terminate |
| 395 | * |
| 396 | * After this call we don't allow any request other than clunk. |
| 397 | */ |
| 398 | |
| 399 | void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) |
| 400 | { |
| 401 | P9_DPRINTK(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); |
| 402 | p9_client_begin_disconnect(v9ses->clnt); |
| 403 | } |
| 404 | |
| 405 | extern int v9fs_error_init(void); |
| 406 | |
| 407 | static struct kobject *v9fs_kobj; |
| 408 | |
| 409 | #ifdef CONFIG_9P_FSCACHE |
| 410 | /** |
| 411 | * caches_show - list caches associated with a session |
| 412 | * |
| 413 | * Returns the size of buffer written. |
| 414 | */ |
| 415 | |
| 416 | static ssize_t caches_show(struct kobject *kobj, |
| 417 | struct kobj_attribute *attr, |
| 418 | char *buf) |
| 419 | { |
| 420 | ssize_t n = 0, count = 0, limit = PAGE_SIZE; |
| 421 | struct v9fs_session_info *v9ses; |
| 422 | |
| 423 | spin_lock(&v9fs_sessionlist_lock); |
| 424 | list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { |
| 425 | if (v9ses->cachetag) { |
| 426 | n = snprintf(buf, limit, "%s\n", v9ses->cachetag); |
| 427 | if (n < 0) { |
| 428 | count = n; |
| 429 | break; |
| 430 | } |
| 431 | |
| 432 | count += n; |
| 433 | limit -= n; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | spin_unlock(&v9fs_sessionlist_lock); |
| 438 | return count; |
| 439 | } |
| 440 | |
| 441 | static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); |
| 442 | #endif /* CONFIG_9P_FSCACHE */ |
| 443 | |
| 444 | static struct attribute *v9fs_attrs[] = { |
| 445 | #ifdef CONFIG_9P_FSCACHE |
| 446 | &v9fs_attr_cache.attr, |
| 447 | #endif |
| 448 | NULL, |
| 449 | }; |
| 450 | |
| 451 | static struct attribute_group v9fs_attr_group = { |
| 452 | .attrs = v9fs_attrs, |
| 453 | }; |
| 454 | |
| 455 | /** |
| 456 | * v9fs_sysfs_init - Initialize the v9fs sysfs interface |
| 457 | * |
| 458 | */ |
| 459 | |
| 460 | static int v9fs_sysfs_init(void) |
| 461 | { |
| 462 | v9fs_kobj = kobject_create_and_add("9p", fs_kobj); |
| 463 | if (!v9fs_kobj) |
| 464 | return -ENOMEM; |
| 465 | |
| 466 | if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { |
| 467 | kobject_put(v9fs_kobj); |
| 468 | return -ENOMEM; |
| 469 | } |
| 470 | |
| 471 | return 0; |
| 472 | } |
| 473 | |
| 474 | /** |
| 475 | * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface |
| 476 | * |
| 477 | */ |
| 478 | |
| 479 | static void v9fs_sysfs_cleanup(void) |
| 480 | { |
| 481 | sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); |
| 482 | kobject_put(v9fs_kobj); |
| 483 | } |
| 484 | |
| 485 | static void v9fs_inode_init_once(void *foo) |
| 486 | { |
| 487 | struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; |
| 488 | #ifdef CONFIG_9P_FSCACHE |
| 489 | v9inode->fscache = NULL; |
| 490 | v9inode->fscache_key = NULL; |
| 491 | #endif |
| 492 | inode_init_once(&v9inode->vfs_inode); |
| 493 | } |
| 494 | |
| 495 | /** |
| 496 | * v9fs_init_inode_cache - initialize a cache for 9P |
| 497 | * Returns 0 on success. |
| 498 | */ |
| 499 | static int v9fs_init_inode_cache(void) |
| 500 | { |
| 501 | v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", |
| 502 | sizeof(struct v9fs_inode), |
| 503 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 504 | SLAB_MEM_SPREAD), |
| 505 | v9fs_inode_init_once); |
| 506 | if (!v9fs_inode_cache) |
| 507 | return -ENOMEM; |
| 508 | |
| 509 | return 0; |
| 510 | } |
| 511 | |
| 512 | /** |
| 513 | * v9fs_destroy_inode_cache - destroy the cache of 9P inode |
| 514 | * |
| 515 | */ |
| 516 | static void v9fs_destroy_inode_cache(void) |
| 517 | { |
| 518 | kmem_cache_destroy(v9fs_inode_cache); |
| 519 | } |
| 520 | |
| 521 | static int v9fs_cache_register(void) |
| 522 | { |
| 523 | int ret; |
| 524 | ret = v9fs_init_inode_cache(); |
| 525 | if (ret < 0) |
| 526 | return ret; |
| 527 | #ifdef CONFIG_9P_FSCACHE |
| 528 | return fscache_register_netfs(&v9fs_cache_netfs); |
| 529 | #else |
| 530 | return ret; |
| 531 | #endif |
| 532 | } |
| 533 | |
| 534 | static void v9fs_cache_unregister(void) |
| 535 | { |
| 536 | v9fs_destroy_inode_cache(); |
| 537 | #ifdef CONFIG_9P_FSCACHE |
| 538 | fscache_unregister_netfs(&v9fs_cache_netfs); |
| 539 | #endif |
| 540 | } |
| 541 | |
| 542 | /** |
| 543 | * init_v9fs - Initialize module |
| 544 | * |
| 545 | */ |
| 546 | |
| 547 | static int __init init_v9fs(void) |
| 548 | { |
| 549 | int err; |
| 550 | printk(KERN_INFO "Installing v9fs 9p2000 file system support\n"); |
| 551 | /* TODO: Setup list of registered trasnport modules */ |
| 552 | err = register_filesystem(&v9fs_fs_type); |
| 553 | if (err < 0) { |
| 554 | printk(KERN_ERR "Failed to register filesystem\n"); |
| 555 | return err; |
| 556 | } |
| 557 | |
| 558 | err = v9fs_cache_register(); |
| 559 | if (err < 0) { |
| 560 | printk(KERN_ERR "Failed to register v9fs for caching\n"); |
| 561 | goto out_fs_unreg; |
| 562 | } |
| 563 | |
| 564 | err = v9fs_sysfs_init(); |
| 565 | if (err < 0) { |
| 566 | printk(KERN_ERR "Failed to register with sysfs\n"); |
| 567 | goto out_sysfs_cleanup; |
| 568 | } |
| 569 | |
| 570 | return 0; |
| 571 | |
| 572 | out_sysfs_cleanup: |
| 573 | v9fs_sysfs_cleanup(); |
| 574 | |
| 575 | out_fs_unreg: |
| 576 | unregister_filesystem(&v9fs_fs_type); |
| 577 | |
| 578 | return err; |
| 579 | } |
| 580 | |
| 581 | /** |
| 582 | * exit_v9fs - shutdown module |
| 583 | * |
| 584 | */ |
| 585 | |
| 586 | static void __exit exit_v9fs(void) |
| 587 | { |
| 588 | v9fs_sysfs_cleanup(); |
| 589 | v9fs_cache_unregister(); |
| 590 | unregister_filesystem(&v9fs_fs_type); |
| 591 | } |
| 592 | |
| 593 | module_init(init_v9fs) |
| 594 | module_exit(exit_v9fs) |
| 595 | |
| 596 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); |
| 597 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); |
| 598 | MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>"); |
| 599 | MODULE_LICENSE("GPL"); |