1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #include <linux/sched.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/module.h> 15 #include <linux/kobject.h> 16 #include <asm/uaccess.h> 17 #include <linux/gfs2_ondisk.h> 18 #include <linux/genhd.h> 19 20 #include "gfs2.h" 21 #include "incore.h" 22 #include "sys.h" 23 #include "super.h" 24 #include "glock.h" 25 #include "quota.h" 26 #include "util.h" 27 #include "glops.h" 28 #include "recovery.h" 29 30 struct gfs2_attr { 31 struct attribute attr; 32 ssize_t (*show)(struct gfs2_sbd *, char *); 33 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 34 }; 35 36 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr, 37 char *buf) 38 { 39 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 40 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 41 return a->show ? a->show(sdp, buf) : 0; 42 } 43 44 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr, 45 const char *buf, size_t len) 46 { 47 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 48 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 49 return a->store ? a->store(sdp, buf, len) : len; 50 } 51 52 static const struct sysfs_ops gfs2_attr_ops = { 53 .show = gfs2_attr_show, 54 .store = gfs2_attr_store, 55 }; 56 57 58 static struct kset *gfs2_kset; 59 60 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf) 61 { 62 return snprintf(buf, PAGE_SIZE, "%u:%u\n", 63 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev)); 64 } 65 66 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) 67 { 68 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); 69 } 70 71 static int gfs2_uuid_valid(const u8 *uuid) 72 { 73 int i; 74 75 for (i = 0; i < 16; i++) { 76 if (uuid[i]) 77 return 1; 78 } 79 return 0; 80 } 81 82 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf) 83 { 84 struct super_block *s = sdp->sd_vfs; 85 const u8 *uuid = s->s_uuid; 86 buf[0] = '\0'; 87 if (!gfs2_uuid_valid(uuid)) 88 return 0; 89 return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid); 90 } 91 92 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) 93 { 94 unsigned int count; 95 96 mutex_lock(&sdp->sd_freeze_lock); 97 count = sdp->sd_freeze_count; 98 mutex_unlock(&sdp->sd_freeze_lock); 99 100 return snprintf(buf, PAGE_SIZE, "%u\n", count); 101 } 102 103 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 104 { 105 ssize_t ret = len; 106 int error = 0; 107 int n = simple_strtol(buf, NULL, 0); 108 109 if (!capable(CAP_SYS_ADMIN)) 110 return -EACCES; 111 112 switch (n) { 113 case 0: 114 gfs2_unfreeze_fs(sdp); 115 break; 116 case 1: 117 error = gfs2_freeze_fs(sdp); 118 break; 119 default: 120 ret = -EINVAL; 121 } 122 123 if (error) 124 fs_warn(sdp, "freeze %d error %d", n, error); 125 126 return ret; 127 } 128 129 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) 130 { 131 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags); 132 return snprintf(buf, PAGE_SIZE, "%u\n", b); 133 } 134 135 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 136 { 137 if (!capable(CAP_SYS_ADMIN)) 138 return -EACCES; 139 140 if (simple_strtol(buf, NULL, 0) != 1) 141 return -EINVAL; 142 143 gfs2_lm_withdraw(sdp, 144 "GFS2: fsid=%s: withdrawing from cluster at user's request\n", 145 sdp->sd_fsname); 146 return len; 147 } 148 149 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, 150 size_t len) 151 { 152 if (!capable(CAP_SYS_ADMIN)) 153 return -EACCES; 154 155 if (simple_strtol(buf, NULL, 0) != 1) 156 return -EINVAL; 157 158 gfs2_statfs_sync(sdp->sd_vfs, 0); 159 return len; 160 } 161 162 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 163 size_t len) 164 { 165 if (!capable(CAP_SYS_ADMIN)) 166 return -EACCES; 167 168 if (simple_strtol(buf, NULL, 0) != 1) 169 return -EINVAL; 170 171 gfs2_quota_sync(sdp->sd_vfs, 0); 172 return len; 173 } 174 175 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 176 size_t len) 177 { 178 int error; 179 u32 id; 180 181 if (!capable(CAP_SYS_ADMIN)) 182 return -EACCES; 183 184 id = simple_strtoul(buf, NULL, 0); 185 186 error = gfs2_quota_refresh(sdp, 1, id); 187 return error ? error : len; 188 } 189 190 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 191 size_t len) 192 { 193 int error; 194 u32 id; 195 196 if (!capable(CAP_SYS_ADMIN)) 197 return -EACCES; 198 199 id = simple_strtoul(buf, NULL, 0); 200 201 error = gfs2_quota_refresh(sdp, 0, id); 202 return error ? error : len; 203 } 204 205 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 206 { 207 struct gfs2_glock *gl; 208 const struct gfs2_glock_operations *glops; 209 unsigned int glmode; 210 unsigned int gltype; 211 unsigned long long glnum; 212 char mode[16]; 213 int rv; 214 215 if (!capable(CAP_SYS_ADMIN)) 216 return -EACCES; 217 218 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum, 219 mode); 220 if (rv != 3) 221 return -EINVAL; 222 223 if (strcmp(mode, "EX") == 0) 224 glmode = LM_ST_UNLOCKED; 225 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0)) 226 glmode = LM_ST_DEFERRED; 227 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0)) 228 glmode = LM_ST_SHARED; 229 else 230 return -EINVAL; 231 232 if (gltype > LM_TYPE_JOURNAL) 233 return -EINVAL; 234 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_TRANS_LOCK) 235 glops = &gfs2_trans_glops; 236 else 237 glops = gfs2_glops_list[gltype]; 238 if (glops == NULL) 239 return -EINVAL; 240 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags)) 241 fs_info(sdp, "demote interface used\n"); 242 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl); 243 if (rv) 244 return rv; 245 gfs2_glock_cb(gl, glmode); 246 gfs2_glock_put(gl); 247 return len; 248 } 249 250 251 #define GFS2_ATTR(name, mode, show, store) \ 252 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 253 254 GFS2_ATTR(id, 0444, id_show, NULL); 255 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 256 GFS2_ATTR(uuid, 0444, uuid_show, NULL); 257 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 258 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 259 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 260 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 261 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 262 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 263 GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store); 264 265 static struct attribute *gfs2_attrs[] = { 266 &gfs2_attr_id.attr, 267 &gfs2_attr_fsname.attr, 268 &gfs2_attr_uuid.attr, 269 &gfs2_attr_freeze.attr, 270 &gfs2_attr_withdraw.attr, 271 &gfs2_attr_statfs_sync.attr, 272 &gfs2_attr_quota_sync.attr, 273 &gfs2_attr_quota_refresh_user.attr, 274 &gfs2_attr_quota_refresh_group.attr, 275 &gfs2_attr_demote_rq.attr, 276 NULL, 277 }; 278 279 static void gfs2_sbd_release(struct kobject *kobj) 280 { 281 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 282 283 kfree(sdp); 284 } 285 286 static struct kobj_type gfs2_ktype = { 287 .release = gfs2_sbd_release, 288 .default_attrs = gfs2_attrs, 289 .sysfs_ops = &gfs2_attr_ops, 290 }; 291 292 293 /* 294 * lock_module. Originally from lock_dlm 295 */ 296 297 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf) 298 { 299 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops; 300 return sprintf(buf, "%s\n", ops->lm_proto_name); 301 } 302 303 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf) 304 { 305 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 306 ssize_t ret; 307 int val = 0; 308 309 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags)) 310 val = 1; 311 ret = sprintf(buf, "%d\n", val); 312 return ret; 313 } 314 315 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 316 { 317 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 318 ssize_t ret = len; 319 int val; 320 321 val = simple_strtol(buf, NULL, 0); 322 323 if (val == 1) 324 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags); 325 else if (val == 0) { 326 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags); 327 smp_mb__after_clear_bit(); 328 gfs2_glock_thaw(sdp); 329 } else { 330 ret = -EINVAL; 331 } 332 return ret; 333 } 334 335 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) 336 { 337 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 338 return sprintf(buf, "%d\n", ls->ls_first); 339 } 340 341 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 342 { 343 unsigned first; 344 int rv; 345 346 rv = sscanf(buf, "%u", &first); 347 if (rv != 1 || first > 1) 348 return -EINVAL; 349 rv = wait_for_completion_killable(&sdp->sd_locking_init); 350 if (rv) 351 return rv; 352 spin_lock(&sdp->sd_jindex_spin); 353 rv = -EBUSY; 354 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) 355 goto out; 356 rv = -EINVAL; 357 if (sdp->sd_args.ar_spectator) 358 goto out; 359 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 360 goto out; 361 sdp->sd_lockstruct.ls_first = first; 362 rv = 0; 363 out: 364 spin_unlock(&sdp->sd_jindex_spin); 365 return rv ? rv : len; 366 } 367 368 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) 369 { 370 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 371 return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags)); 372 } 373 374 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid) 375 { 376 struct gfs2_jdesc *jd; 377 int rv; 378 379 spin_lock(&sdp->sd_jindex_spin); 380 rv = -EBUSY; 381 if (sdp->sd_jdesc->jd_jid == jid) 382 goto out; 383 rv = -ENOENT; 384 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 385 if (jd->jd_jid != jid) 386 continue; 387 rv = gfs2_recover_journal(jd, false); 388 break; 389 } 390 out: 391 spin_unlock(&sdp->sd_jindex_spin); 392 return rv; 393 } 394 395 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 396 { 397 unsigned jid; 398 int rv; 399 400 rv = sscanf(buf, "%u", &jid); 401 if (rv != 1) 402 return -EINVAL; 403 404 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) { 405 rv = -ESHUTDOWN; 406 goto out; 407 } 408 409 rv = gfs2_recover_set(sdp, jid); 410 out: 411 return rv ? rv : len; 412 } 413 414 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) 415 { 416 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 417 return sprintf(buf, "%d\n", ls->ls_recover_jid_done); 418 } 419 420 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) 421 { 422 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 423 return sprintf(buf, "%d\n", ls->ls_recover_jid_status); 424 } 425 426 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) 427 { 428 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid); 429 } 430 431 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 432 { 433 int jid; 434 int rv; 435 436 rv = sscanf(buf, "%d", &jid); 437 if (rv != 1) 438 return -EINVAL; 439 rv = wait_for_completion_killable(&sdp->sd_locking_init); 440 if (rv) 441 return rv; 442 spin_lock(&sdp->sd_jindex_spin); 443 rv = -EINVAL; 444 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 445 goto out; 446 rv = -EBUSY; 447 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) 448 goto out; 449 rv = 0; 450 if (sdp->sd_args.ar_spectator && jid > 0) 451 rv = jid = -EINVAL; 452 sdp->sd_lockstruct.ls_jid = jid; 453 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags); 454 smp_mb__after_clear_bit(); 455 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID); 456 out: 457 spin_unlock(&sdp->sd_jindex_spin); 458 return rv ? rv : len; 459 } 460 461 #define GDLM_ATTR(_name,_mode,_show,_store) \ 462 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) 463 464 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); 465 GDLM_ATTR(block, 0644, block_show, block_store); 466 GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 467 GDLM_ATTR(jid, 0644, jid_show, jid_store); 468 GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store); 469 GDLM_ATTR(first_done, 0444, first_done_show, NULL); 470 GDLM_ATTR(recover, 0600, NULL, recover_store); 471 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); 472 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); 473 474 static struct attribute *lock_module_attrs[] = { 475 &gdlm_attr_proto_name.attr, 476 &gdlm_attr_block.attr, 477 &gdlm_attr_withdraw.attr, 478 &gdlm_attr_jid.attr, 479 &gdlm_attr_first.attr, 480 &gdlm_attr_first_done.attr, 481 &gdlm_attr_recover.attr, 482 &gdlm_attr_recover_done.attr, 483 &gdlm_attr_recover_status.attr, 484 NULL, 485 }; 486 487 /* 488 * get and set struct gfs2_tune fields 489 */ 490 491 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 492 { 493 return snprintf(buf, PAGE_SIZE, "%u %u\n", 494 sdp->sd_tune.gt_quota_scale_num, 495 sdp->sd_tune.gt_quota_scale_den); 496 } 497 498 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 499 size_t len) 500 { 501 struct gfs2_tune *gt = &sdp->sd_tune; 502 unsigned int x, y; 503 504 if (!capable(CAP_SYS_ADMIN)) 505 return -EACCES; 506 507 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 508 return -EINVAL; 509 510 spin_lock(>->gt_spin); 511 gt->gt_quota_scale_num = x; 512 gt->gt_quota_scale_den = y; 513 spin_unlock(>->gt_spin); 514 return len; 515 } 516 517 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 518 int check_zero, const char *buf, size_t len) 519 { 520 struct gfs2_tune *gt = &sdp->sd_tune; 521 unsigned int x; 522 523 if (!capable(CAP_SYS_ADMIN)) 524 return -EACCES; 525 526 x = simple_strtoul(buf, NULL, 0); 527 528 if (check_zero && !x) 529 return -EINVAL; 530 531 spin_lock(>->gt_spin); 532 *field = x; 533 spin_unlock(>->gt_spin); 534 return len; 535 } 536 537 #define TUNE_ATTR_3(name, show, store) \ 538 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) 539 540 #define TUNE_ATTR_2(name, store) \ 541 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 542 { \ 543 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 544 } \ 545 TUNE_ATTR_3(name, name##_show, store) 546 547 #define TUNE_ATTR(name, check_zero) \ 548 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 549 { \ 550 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 551 } \ 552 TUNE_ATTR_2(name, name##_store) 553 554 TUNE_ATTR(quota_warn_period, 0); 555 TUNE_ATTR(quota_quantum, 0); 556 TUNE_ATTR(max_readahead, 0); 557 TUNE_ATTR(complain_secs, 0); 558 TUNE_ATTR(statfs_slow, 0); 559 TUNE_ATTR(new_files_jdata, 0); 560 TUNE_ATTR(quota_simul_sync, 1); 561 TUNE_ATTR(statfs_quantum, 1); 562 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 563 564 static struct attribute *tune_attrs[] = { 565 &tune_attr_quota_warn_period.attr, 566 &tune_attr_quota_quantum.attr, 567 &tune_attr_max_readahead.attr, 568 &tune_attr_complain_secs.attr, 569 &tune_attr_statfs_slow.attr, 570 &tune_attr_quota_simul_sync.attr, 571 &tune_attr_statfs_quantum.attr, 572 &tune_attr_quota_scale.attr, 573 &tune_attr_new_files_jdata.attr, 574 NULL, 575 }; 576 577 static struct attribute_group tune_group = { 578 .name = "tune", 579 .attrs = tune_attrs, 580 }; 581 582 static struct attribute_group lock_module_group = { 583 .name = "lock_module", 584 .attrs = lock_module_attrs, 585 }; 586 587 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 588 { 589 struct super_block *sb = sdp->sd_vfs; 590 int error; 591 char ro[20]; 592 char spectator[20]; 593 char *envp[] = { ro, spectator, NULL }; 594 int sysfs_frees_sdp = 0; 595 596 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 597 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 598 599 sdp->sd_kobj.kset = gfs2_kset; 600 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 601 "%s", sdp->sd_table_name); 602 if (error) 603 goto fail_reg; 604 605 sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling 606 function gfs2_sbd_release. */ 607 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 608 if (error) 609 goto fail_reg; 610 611 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); 612 if (error) 613 goto fail_tune; 614 615 error = sysfs_create_link(&sdp->sd_kobj, 616 &disk_to_dev(sb->s_bdev->bd_disk)->kobj, 617 "device"); 618 if (error) 619 goto fail_lock_module; 620 621 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); 622 return 0; 623 624 fail_lock_module: 625 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 626 fail_tune: 627 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 628 fail_reg: 629 free_percpu(sdp->sd_lkstats); 630 fs_err(sdp, "error %d adding sysfs files", error); 631 if (sysfs_frees_sdp) 632 kobject_put(&sdp->sd_kobj); 633 else 634 kfree(sdp); 635 sb->s_fs_info = NULL; 636 return error; 637 } 638 639 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 640 { 641 sysfs_remove_link(&sdp->sd_kobj, "device"); 642 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 643 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 644 kobject_put(&sdp->sd_kobj); 645 } 646 647 static int gfs2_uevent(struct kset *kset, struct kobject *kobj, 648 struct kobj_uevent_env *env) 649 { 650 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 651 struct super_block *s = sdp->sd_vfs; 652 const u8 *uuid = s->s_uuid; 653 654 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 655 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 656 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 657 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid); 658 if (gfs2_uuid_valid(uuid)) 659 add_uevent_var(env, "UUID=%pUB", uuid); 660 return 0; 661 } 662 663 static const struct kset_uevent_ops gfs2_uevent_ops = { 664 .uevent = gfs2_uevent, 665 }; 666 667 int gfs2_sys_init(void) 668 { 669 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 670 if (!gfs2_kset) 671 return -ENOMEM; 672 return 0; 673 } 674 675 void gfs2_sys_uninit(void) 676 { 677 kset_unregister(gfs2_kset); 678 } 679 680