| 1 | /* |
| 2 | * GPL HEADER START |
| 3 | * |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 only, |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License version 2 for more details (a copy is included |
| 14 | * in the LICENSE file that accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * version 2 along with this program; If not, see |
| 18 | * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| 19 | * |
| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 21 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 22 | * have any questions. |
| 23 | * |
| 24 | * GPL HEADER END |
| 25 | */ |
| 26 | /* |
| 27 | * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. |
| 28 | * Use is subject to license terms. |
| 29 | * |
| 30 | * Copyright (c) 2011, 2013, Intel Corporation. |
| 31 | */ |
| 32 | /* |
| 33 | * This file is part of Lustre, http://www.lustre.org/ |
| 34 | * Lustre is a trademark of Sun Microsystems, Inc. |
| 35 | * |
| 36 | * lustre/fid/fid_request.c |
| 37 | * |
| 38 | * Lustre Sequence Manager |
| 39 | * |
| 40 | * Author: Yury Umanets <umka@clusterfs.com> |
| 41 | */ |
| 42 | |
| 43 | #define DEBUG_SUBSYSTEM S_FID |
| 44 | |
| 45 | #include "../../include/linux/libcfs/libcfs.h" |
| 46 | #include <linux/module.h> |
| 47 | |
| 48 | #include "../include/obd.h" |
| 49 | #include "../include/obd_class.h" |
| 50 | #include "../include/obd_support.h" |
| 51 | #include "../include/lustre_fid.h" |
| 52 | /* mdc RPC locks */ |
| 53 | #include "../include/lustre_mdc.h" |
| 54 | #include "fid_internal.h" |
| 55 | |
| 56 | static struct dentry *seq_debugfs_dir; |
| 57 | |
| 58 | static int seq_client_rpc(struct lu_client_seq *seq, |
| 59 | struct lu_seq_range *output, __u32 opc, |
| 60 | const char *opcname) |
| 61 | { |
| 62 | struct obd_export *exp = seq->lcs_exp; |
| 63 | struct ptlrpc_request *req; |
| 64 | struct lu_seq_range *out, *in; |
| 65 | __u32 *op; |
| 66 | unsigned int debug_mask; |
| 67 | int rc; |
| 68 | |
| 69 | req = ptlrpc_request_alloc_pack(class_exp2cliimp(exp), &RQF_SEQ_QUERY, |
| 70 | LUSTRE_MDS_VERSION, SEQ_QUERY); |
| 71 | if (req == NULL) |
| 72 | return -ENOMEM; |
| 73 | |
| 74 | /* Init operation code */ |
| 75 | op = req_capsule_client_get(&req->rq_pill, &RMF_SEQ_OPC); |
| 76 | *op = opc; |
| 77 | |
| 78 | /* Zero out input range, this is not recovery yet. */ |
| 79 | in = req_capsule_client_get(&req->rq_pill, &RMF_SEQ_RANGE); |
| 80 | range_init(in); |
| 81 | |
| 82 | ptlrpc_request_set_replen(req); |
| 83 | |
| 84 | in->lsr_index = seq->lcs_space.lsr_index; |
| 85 | if (seq->lcs_type == LUSTRE_SEQ_METADATA) |
| 86 | fld_range_set_mdt(in); |
| 87 | else |
| 88 | fld_range_set_ost(in); |
| 89 | |
| 90 | if (opc == SEQ_ALLOC_SUPER) { |
| 91 | req->rq_request_portal = SEQ_CONTROLLER_PORTAL; |
| 92 | req->rq_reply_portal = MDC_REPLY_PORTAL; |
| 93 | /* During allocating super sequence for data object, |
| 94 | * the current thread might hold the export of MDT0(MDT0 |
| 95 | * precreating objects on this OST), and it will send the |
| 96 | * request to MDT0 here, so we can not keep resending the |
| 97 | * request here, otherwise if MDT0 is failed(umounted), |
| 98 | * it can not release the export of MDT0 */ |
| 99 | if (seq->lcs_type == LUSTRE_SEQ_DATA) |
| 100 | req->rq_no_delay = req->rq_no_resend = 1; |
| 101 | debug_mask = D_CONSOLE; |
| 102 | } else { |
| 103 | if (seq->lcs_type == LUSTRE_SEQ_METADATA) |
| 104 | req->rq_request_portal = SEQ_METADATA_PORTAL; |
| 105 | else |
| 106 | req->rq_request_portal = SEQ_DATA_PORTAL; |
| 107 | debug_mask = D_INFO; |
| 108 | } |
| 109 | |
| 110 | ptlrpc_at_set_req_timeout(req); |
| 111 | |
| 112 | if (seq->lcs_type == LUSTRE_SEQ_METADATA) |
| 113 | mdc_get_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL); |
| 114 | rc = ptlrpc_queue_wait(req); |
| 115 | if (seq->lcs_type == LUSTRE_SEQ_METADATA) |
| 116 | mdc_put_rpc_lock(exp->exp_obd->u.cli.cl_rpc_lock, NULL); |
| 117 | if (rc) |
| 118 | goto out_req; |
| 119 | |
| 120 | out = req_capsule_server_get(&req->rq_pill, &RMF_SEQ_RANGE); |
| 121 | *output = *out; |
| 122 | |
| 123 | if (!range_is_sane(output)) { |
| 124 | CERROR("%s: Invalid range received from server: " |
| 125 | DRANGE"\n", seq->lcs_name, PRANGE(output)); |
| 126 | rc = -EINVAL; |
| 127 | goto out_req; |
| 128 | } |
| 129 | |
| 130 | if (range_is_exhausted(output)) { |
| 131 | CERROR("%s: Range received from server is exhausted: " |
| 132 | DRANGE"]\n", seq->lcs_name, PRANGE(output)); |
| 133 | rc = -EINVAL; |
| 134 | goto out_req; |
| 135 | } |
| 136 | |
| 137 | CDEBUG_LIMIT(debug_mask, "%s: Allocated %s-sequence "DRANGE"]\n", |
| 138 | seq->lcs_name, opcname, PRANGE(output)); |
| 139 | |
| 140 | out_req: |
| 141 | ptlrpc_req_finished(req); |
| 142 | return rc; |
| 143 | } |
| 144 | |
| 145 | /* Request sequence-controller node to allocate new super-sequence. */ |
| 146 | int seq_client_alloc_super(struct lu_client_seq *seq, |
| 147 | const struct lu_env *env) |
| 148 | { |
| 149 | int rc; |
| 150 | |
| 151 | mutex_lock(&seq->lcs_mutex); |
| 152 | |
| 153 | if (seq->lcs_srv) { |
| 154 | rc = 0; |
| 155 | } else { |
| 156 | /* Check whether the connection to seq controller has been |
| 157 | * setup (lcs_exp != NULL) */ |
| 158 | if (seq->lcs_exp == NULL) { |
| 159 | mutex_unlock(&seq->lcs_mutex); |
| 160 | return -EINPROGRESS; |
| 161 | } |
| 162 | |
| 163 | rc = seq_client_rpc(seq, &seq->lcs_space, |
| 164 | SEQ_ALLOC_SUPER, "super"); |
| 165 | } |
| 166 | mutex_unlock(&seq->lcs_mutex); |
| 167 | return rc; |
| 168 | } |
| 169 | |
| 170 | /* Request sequence-controller node to allocate new meta-sequence. */ |
| 171 | static int seq_client_alloc_meta(const struct lu_env *env, |
| 172 | struct lu_client_seq *seq) |
| 173 | { |
| 174 | int rc; |
| 175 | |
| 176 | if (seq->lcs_srv) { |
| 177 | rc = 0; |
| 178 | } else { |
| 179 | do { |
| 180 | /* If meta server return -EINPROGRESS or EAGAIN, |
| 181 | * it means meta server might not be ready to |
| 182 | * allocate super sequence from sequence controller |
| 183 | * (MDT0)yet */ |
| 184 | rc = seq_client_rpc(seq, &seq->lcs_space, |
| 185 | SEQ_ALLOC_META, "meta"); |
| 186 | } while (rc == -EINPROGRESS || rc == -EAGAIN); |
| 187 | } |
| 188 | |
| 189 | return rc; |
| 190 | } |
| 191 | |
| 192 | /* Allocate new sequence for client. */ |
| 193 | static int seq_client_alloc_seq(const struct lu_env *env, |
| 194 | struct lu_client_seq *seq, u64 *seqnr) |
| 195 | { |
| 196 | int rc; |
| 197 | |
| 198 | LASSERT(range_is_sane(&seq->lcs_space)); |
| 199 | |
| 200 | if (range_is_exhausted(&seq->lcs_space)) { |
| 201 | rc = seq_client_alloc_meta(env, seq); |
| 202 | if (rc) { |
| 203 | CERROR("%s: Can't allocate new meta-sequence, rc %d\n", |
| 204 | seq->lcs_name, rc); |
| 205 | return rc; |
| 206 | } |
| 207 | CDEBUG(D_INFO, "%s: New range - "DRANGE"\n", |
| 208 | seq->lcs_name, PRANGE(&seq->lcs_space)); |
| 209 | } else { |
| 210 | rc = 0; |
| 211 | } |
| 212 | |
| 213 | LASSERT(!range_is_exhausted(&seq->lcs_space)); |
| 214 | *seqnr = seq->lcs_space.lsr_start; |
| 215 | seq->lcs_space.lsr_start += 1; |
| 216 | |
| 217 | CDEBUG(D_INFO, "%s: Allocated sequence [%#llx]\n", seq->lcs_name, |
| 218 | *seqnr); |
| 219 | |
| 220 | return rc; |
| 221 | } |
| 222 | |
| 223 | static int seq_fid_alloc_prep(struct lu_client_seq *seq, |
| 224 | wait_queue_t *link) |
| 225 | { |
| 226 | if (seq->lcs_update) { |
| 227 | add_wait_queue(&seq->lcs_waitq, link); |
| 228 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 229 | mutex_unlock(&seq->lcs_mutex); |
| 230 | |
| 231 | schedule(); |
| 232 | |
| 233 | mutex_lock(&seq->lcs_mutex); |
| 234 | remove_wait_queue(&seq->lcs_waitq, link); |
| 235 | set_current_state(TASK_RUNNING); |
| 236 | return -EAGAIN; |
| 237 | } |
| 238 | ++seq->lcs_update; |
| 239 | mutex_unlock(&seq->lcs_mutex); |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | static void seq_fid_alloc_fini(struct lu_client_seq *seq) |
| 244 | { |
| 245 | LASSERT(seq->lcs_update == 1); |
| 246 | mutex_lock(&seq->lcs_mutex); |
| 247 | --seq->lcs_update; |
| 248 | wake_up(&seq->lcs_waitq); |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Allocate the whole seq to the caller. |
| 253 | **/ |
| 254 | int seq_client_get_seq(const struct lu_env *env, |
| 255 | struct lu_client_seq *seq, u64 *seqnr) |
| 256 | { |
| 257 | wait_queue_t link; |
| 258 | int rc; |
| 259 | |
| 260 | LASSERT(seqnr != NULL); |
| 261 | mutex_lock(&seq->lcs_mutex); |
| 262 | init_waitqueue_entry(&link, current); |
| 263 | |
| 264 | while (1) { |
| 265 | rc = seq_fid_alloc_prep(seq, &link); |
| 266 | if (rc == 0) |
| 267 | break; |
| 268 | } |
| 269 | |
| 270 | rc = seq_client_alloc_seq(env, seq, seqnr); |
| 271 | if (rc) { |
| 272 | CERROR("%s: Can't allocate new sequence, rc %d\n", |
| 273 | seq->lcs_name, rc); |
| 274 | seq_fid_alloc_fini(seq); |
| 275 | mutex_unlock(&seq->lcs_mutex); |
| 276 | return rc; |
| 277 | } |
| 278 | |
| 279 | CDEBUG(D_INFO, "%s: allocate sequence [0x%16.16Lx]\n", |
| 280 | seq->lcs_name, *seqnr); |
| 281 | |
| 282 | /* Since the caller require the whole seq, |
| 283 | * so marked this seq to be used */ |
| 284 | if (seq->lcs_type == LUSTRE_SEQ_METADATA) |
| 285 | seq->lcs_fid.f_oid = LUSTRE_METADATA_SEQ_MAX_WIDTH; |
| 286 | else |
| 287 | seq->lcs_fid.f_oid = LUSTRE_DATA_SEQ_MAX_WIDTH; |
| 288 | |
| 289 | seq->lcs_fid.f_seq = *seqnr; |
| 290 | seq->lcs_fid.f_ver = 0; |
| 291 | /* |
| 292 | * Inform caller that sequence switch is performed to allow it |
| 293 | * to setup FLD for it. |
| 294 | */ |
| 295 | seq_fid_alloc_fini(seq); |
| 296 | mutex_unlock(&seq->lcs_mutex); |
| 297 | |
| 298 | return rc; |
| 299 | } |
| 300 | EXPORT_SYMBOL(seq_client_get_seq); |
| 301 | |
| 302 | /* Allocate new fid on passed client @seq and save it to @fid. */ |
| 303 | int seq_client_alloc_fid(const struct lu_env *env, |
| 304 | struct lu_client_seq *seq, struct lu_fid *fid) |
| 305 | { |
| 306 | wait_queue_t link; |
| 307 | int rc; |
| 308 | |
| 309 | LASSERT(seq != NULL); |
| 310 | LASSERT(fid != NULL); |
| 311 | |
| 312 | init_waitqueue_entry(&link, current); |
| 313 | mutex_lock(&seq->lcs_mutex); |
| 314 | |
| 315 | if (OBD_FAIL_CHECK(OBD_FAIL_SEQ_EXHAUST)) |
| 316 | seq->lcs_fid.f_oid = seq->lcs_width; |
| 317 | |
| 318 | while (1) { |
| 319 | u64 seqnr; |
| 320 | |
| 321 | if (!fid_is_zero(&seq->lcs_fid) && |
| 322 | fid_oid(&seq->lcs_fid) < seq->lcs_width) { |
| 323 | /* Just bump last allocated fid and return to caller. */ |
| 324 | seq->lcs_fid.f_oid += 1; |
| 325 | rc = 0; |
| 326 | break; |
| 327 | } |
| 328 | |
| 329 | rc = seq_fid_alloc_prep(seq, &link); |
| 330 | if (rc) |
| 331 | continue; |
| 332 | |
| 333 | rc = seq_client_alloc_seq(env, seq, &seqnr); |
| 334 | if (rc) { |
| 335 | CERROR("%s: Can't allocate new sequence, rc %d\n", |
| 336 | seq->lcs_name, rc); |
| 337 | seq_fid_alloc_fini(seq); |
| 338 | mutex_unlock(&seq->lcs_mutex); |
| 339 | return rc; |
| 340 | } |
| 341 | |
| 342 | CDEBUG(D_INFO, "%s: Switch to sequence [0x%16.16Lx]\n", |
| 343 | seq->lcs_name, seqnr); |
| 344 | |
| 345 | seq->lcs_fid.f_oid = LUSTRE_FID_INIT_OID; |
| 346 | seq->lcs_fid.f_seq = seqnr; |
| 347 | seq->lcs_fid.f_ver = 0; |
| 348 | |
| 349 | /* |
| 350 | * Inform caller that sequence switch is performed to allow it |
| 351 | * to setup FLD for it. |
| 352 | */ |
| 353 | rc = 1; |
| 354 | |
| 355 | seq_fid_alloc_fini(seq); |
| 356 | break; |
| 357 | } |
| 358 | |
| 359 | *fid = seq->lcs_fid; |
| 360 | mutex_unlock(&seq->lcs_mutex); |
| 361 | |
| 362 | CDEBUG(D_INFO, "%s: Allocated FID "DFID"\n", seq->lcs_name, PFID(fid)); |
| 363 | return rc; |
| 364 | } |
| 365 | EXPORT_SYMBOL(seq_client_alloc_fid); |
| 366 | |
| 367 | /* |
| 368 | * Finish the current sequence due to disconnect. |
| 369 | * See mdc_import_event() |
| 370 | */ |
| 371 | void seq_client_flush(struct lu_client_seq *seq) |
| 372 | { |
| 373 | wait_queue_t link; |
| 374 | |
| 375 | LASSERT(seq != NULL); |
| 376 | init_waitqueue_entry(&link, current); |
| 377 | mutex_lock(&seq->lcs_mutex); |
| 378 | |
| 379 | while (seq->lcs_update) { |
| 380 | add_wait_queue(&seq->lcs_waitq, &link); |
| 381 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 382 | mutex_unlock(&seq->lcs_mutex); |
| 383 | |
| 384 | schedule(); |
| 385 | |
| 386 | mutex_lock(&seq->lcs_mutex); |
| 387 | remove_wait_queue(&seq->lcs_waitq, &link); |
| 388 | set_current_state(TASK_RUNNING); |
| 389 | } |
| 390 | |
| 391 | fid_zero(&seq->lcs_fid); |
| 392 | /** |
| 393 | * this id shld not be used for seq range allocation. |
| 394 | * set to -1 for dgb check. |
| 395 | */ |
| 396 | |
| 397 | seq->lcs_space.lsr_index = -1; |
| 398 | |
| 399 | range_init(&seq->lcs_space); |
| 400 | mutex_unlock(&seq->lcs_mutex); |
| 401 | } |
| 402 | EXPORT_SYMBOL(seq_client_flush); |
| 403 | |
| 404 | static void seq_client_debugfs_fini(struct lu_client_seq *seq) |
| 405 | { |
| 406 | if (!IS_ERR_OR_NULL(seq->lcs_debugfs_entry)) |
| 407 | ldebugfs_remove(&seq->lcs_debugfs_entry); |
| 408 | } |
| 409 | |
| 410 | static int seq_client_debugfs_init(struct lu_client_seq *seq) |
| 411 | { |
| 412 | int rc; |
| 413 | |
| 414 | seq->lcs_debugfs_entry = ldebugfs_register(seq->lcs_name, |
| 415 | seq_debugfs_dir, |
| 416 | NULL, NULL); |
| 417 | |
| 418 | if (IS_ERR_OR_NULL(seq->lcs_debugfs_entry)) { |
| 419 | CERROR("%s: LdebugFS failed in seq-init\n", seq->lcs_name); |
| 420 | rc = seq->lcs_debugfs_entry ? PTR_ERR(seq->lcs_debugfs_entry) |
| 421 | : -ENOMEM; |
| 422 | seq->lcs_debugfs_entry = NULL; |
| 423 | return rc; |
| 424 | } |
| 425 | |
| 426 | rc = ldebugfs_add_vars(seq->lcs_debugfs_entry, |
| 427 | seq_client_debugfs_list, seq); |
| 428 | if (rc) { |
| 429 | CERROR("%s: Can't init sequence manager debugfs, rc %d\n", |
| 430 | seq->lcs_name, rc); |
| 431 | goto out_cleanup; |
| 432 | } |
| 433 | |
| 434 | return 0; |
| 435 | |
| 436 | out_cleanup: |
| 437 | seq_client_debugfs_fini(seq); |
| 438 | return rc; |
| 439 | } |
| 440 | |
| 441 | int seq_client_init(struct lu_client_seq *seq, |
| 442 | struct obd_export *exp, |
| 443 | enum lu_cli_type type, |
| 444 | const char *prefix, |
| 445 | struct lu_server_seq *srv) |
| 446 | { |
| 447 | int rc; |
| 448 | |
| 449 | LASSERT(seq != NULL); |
| 450 | LASSERT(prefix != NULL); |
| 451 | |
| 452 | seq->lcs_srv = srv; |
| 453 | seq->lcs_type = type; |
| 454 | |
| 455 | mutex_init(&seq->lcs_mutex); |
| 456 | if (type == LUSTRE_SEQ_METADATA) |
| 457 | seq->lcs_width = LUSTRE_METADATA_SEQ_MAX_WIDTH; |
| 458 | else |
| 459 | seq->lcs_width = LUSTRE_DATA_SEQ_MAX_WIDTH; |
| 460 | |
| 461 | init_waitqueue_head(&seq->lcs_waitq); |
| 462 | /* Make sure that things are clear before work is started. */ |
| 463 | seq_client_flush(seq); |
| 464 | |
| 465 | if (exp != NULL) |
| 466 | seq->lcs_exp = class_export_get(exp); |
| 467 | else if (type == LUSTRE_SEQ_METADATA) |
| 468 | LASSERT(seq->lcs_srv != NULL); |
| 469 | |
| 470 | snprintf(seq->lcs_name, sizeof(seq->lcs_name), |
| 471 | "cli-%s", prefix); |
| 472 | |
| 473 | rc = seq_client_debugfs_init(seq); |
| 474 | if (rc) |
| 475 | seq_client_fini(seq); |
| 476 | return rc; |
| 477 | } |
| 478 | EXPORT_SYMBOL(seq_client_init); |
| 479 | |
| 480 | void seq_client_fini(struct lu_client_seq *seq) |
| 481 | { |
| 482 | seq_client_debugfs_fini(seq); |
| 483 | |
| 484 | if (seq->lcs_exp != NULL) { |
| 485 | class_export_put(seq->lcs_exp); |
| 486 | seq->lcs_exp = NULL; |
| 487 | } |
| 488 | |
| 489 | seq->lcs_srv = NULL; |
| 490 | } |
| 491 | EXPORT_SYMBOL(seq_client_fini); |
| 492 | |
| 493 | int client_fid_init(struct obd_device *obd, |
| 494 | struct obd_export *exp, enum lu_cli_type type) |
| 495 | { |
| 496 | struct client_obd *cli = &obd->u.cli; |
| 497 | char *prefix; |
| 498 | int rc; |
| 499 | |
| 500 | cli->cl_seq = kzalloc(sizeof(*cli->cl_seq), GFP_NOFS); |
| 501 | if (!cli->cl_seq) |
| 502 | return -ENOMEM; |
| 503 | |
| 504 | prefix = kzalloc(MAX_OBD_NAME + 5, GFP_NOFS); |
| 505 | if (!prefix) { |
| 506 | rc = -ENOMEM; |
| 507 | goto out_free_seq; |
| 508 | } |
| 509 | |
| 510 | snprintf(prefix, MAX_OBD_NAME + 5, "cli-%s", obd->obd_name); |
| 511 | |
| 512 | /* Init client side sequence-manager */ |
| 513 | rc = seq_client_init(cli->cl_seq, exp, type, prefix, NULL); |
| 514 | kfree(prefix); |
| 515 | if (rc) |
| 516 | goto out_free_seq; |
| 517 | |
| 518 | return rc; |
| 519 | out_free_seq: |
| 520 | kfree(cli->cl_seq); |
| 521 | cli->cl_seq = NULL; |
| 522 | return rc; |
| 523 | } |
| 524 | EXPORT_SYMBOL(client_fid_init); |
| 525 | |
| 526 | int client_fid_fini(struct obd_device *obd) |
| 527 | { |
| 528 | struct client_obd *cli = &obd->u.cli; |
| 529 | |
| 530 | if (cli->cl_seq != NULL) { |
| 531 | seq_client_fini(cli->cl_seq); |
| 532 | kfree(cli->cl_seq); |
| 533 | cli->cl_seq = NULL; |
| 534 | } |
| 535 | |
| 536 | return 0; |
| 537 | } |
| 538 | EXPORT_SYMBOL(client_fid_fini); |
| 539 | |
| 540 | static int __init fid_mod_init(void) |
| 541 | { |
| 542 | seq_debugfs_dir = ldebugfs_register(LUSTRE_SEQ_NAME, |
| 543 | debugfs_lustre_root, |
| 544 | NULL, NULL); |
| 545 | return PTR_ERR_OR_ZERO(seq_debugfs_dir); |
| 546 | } |
| 547 | |
| 548 | static void __exit fid_mod_exit(void) |
| 549 | { |
| 550 | if (!IS_ERR_OR_NULL(seq_debugfs_dir)) |
| 551 | ldebugfs_remove(&seq_debugfs_dir); |
| 552 | } |
| 553 | |
| 554 | MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>"); |
| 555 | MODULE_DESCRIPTION("Lustre FID Module"); |
| 556 | MODULE_LICENSE("GPL"); |
| 557 | MODULE_VERSION("0.1.0"); |
| 558 | |
| 559 | module_init(fid_mod_init); |
| 560 | module_exit(fid_mod_exit); |