fs/gfs2/sys.c

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