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 #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, 1);
 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 struct kobj_type gfs2_ktype = {
 280         .default_attrs = gfs2_attrs,
 281         .sysfs_ops     = &gfs2_attr_ops,
 282 };
 283
 284
 285 /*
 286  * lock_module. Originally from lock_dlm
 287  */
 288
 289 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 290 {
 291         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 292         return sprintf(buf, "%s\n", ops->lm_proto_name);
 293 }
 294
 295 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 296 {
 297         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 298         ssize_t ret;
 299         int val = 0;
 300
 301         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
 302                 val = 1;
 303         ret = sprintf(buf, "%d\n", val);
 304         return ret;
 305 }
 306
 307 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 308 {
 309         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 310         ssize_t ret = len;
 311         int val;
 312
 313         val = simple_strtol(buf, NULL, 0);
 314
 315         if (val == 1)
 316                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
 317         else if (val == 0) {
 318                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
 319                 smp_mb__after_clear_bit();
 320                 gfs2_glock_thaw(sdp);
 321         } else {
 322                 ret = -EINVAL;
 323         }
 324         return ret;
 325 }
 326
 327 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 328 {
 329         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 330         return sprintf(buf, "%d\n", ls->ls_first);
 331 }
 332
 333 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 334 {
 335         unsigned first;
 336         int rv;
 337
 338         rv = sscanf(buf, "%u", &first);
 339         if (rv != 1 || first > 1)
 340                 return -EINVAL;
 341         spin_lock(&sdp->sd_jindex_spin);
 342         rv = -EBUSY;
 343         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 344                 goto out;
 345         rv = -EINVAL;
 346         if (sdp->sd_args.ar_spectator)
 347                 goto out;
 348         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 349                 goto out;
 350         sdp->sd_lockstruct.ls_first = first;
 351         rv = 0;
 352 out:
 353         spin_unlock(&sdp->sd_jindex_spin);
 354         return rv ? rv : len;
 355 }
 356
 357 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 358 {
 359         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 360         return sprintf(buf, "%d\n", ls->ls_first_done);
 361 }
 362
 363 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 364 {
 365         unsigned jid;
 366         struct gfs2_jdesc *jd;
 367         int rv;
 368
 369         rv = sscanf(buf, "%u", &jid);
 370         if (rv != 1)
 371                 return -EINVAL;
 372
 373         rv = -ESHUTDOWN;
 374         spin_lock(&sdp->sd_jindex_spin);
 375         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
 376                 goto out;
 377         rv = -EBUSY;
 378         if (sdp->sd_jdesc->jd_jid == jid)
 379                 goto out;
 380         rv = -ENOENT;
 381         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 382                 if (jd->jd_jid != jid)
 383                         continue;
 384                 rv = gfs2_recover_journal(jd, false);
 385                 break;
 386         }
 387 out:
 388         spin_unlock(&sdp->sd_jindex_spin);
 389         return rv ? rv : len;
 390 }
 391
 392 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 393 {
 394         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 395         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 396 }
 397
 398 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 399 {
 400         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 401         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 402 }
 403
 404 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 405 {
 406         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 407 }
 408
 409 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 410 {
 411         int jid;
 412         int rv;
 413
 414         rv = sscanf(buf, "%d", &jid);
 415         if (rv != 1)
 416                 return -EINVAL;
 417
 418         spin_lock(&sdp->sd_jindex_spin);
 419         rv = -EINVAL;
 420         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 421                 goto out;
 422         rv = -EBUSY;
 423         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 424                 goto out;
 425         rv = 0;
 426         if (sdp->sd_args.ar_spectator && jid > 0)
 427                 rv = jid = -EINVAL;
 428         sdp->sd_lockstruct.ls_jid = jid;
 429         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 430         smp_mb__after_clear_bit();
 431         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 432 out:
 433         spin_unlock(&sdp->sd_jindex_spin);
 434         return rv ? rv : len;
 435 }
 436
 437 #define GDLM_ATTR(_name,_mode,_show,_store) \
 438 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 439
 440 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 441 GDLM_ATTR(block,                0644, block_show,               block_store);
 442 GDLM_ATTR(withdraw,             0644, withdraw_show,            withdraw_store);
 443 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 444 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 445 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 446 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 447 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 448 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 449
 450 static struct attribute *lock_module_attrs[] = {
 451         &gdlm_attr_proto_name.attr,
 452         &gdlm_attr_block.attr,
 453         &gdlm_attr_withdraw.attr,
 454         &gdlm_attr_jid.attr,
 455         &gdlm_attr_first.attr,
 456         &gdlm_attr_first_done.attr,
 457         &gdlm_attr_recover.attr,
 458         &gdlm_attr_recover_done.attr,
 459         &gdlm_attr_recover_status.attr,
 460         NULL,
 461 };
 462
 463 /*
 464  * get and set struct gfs2_tune fields
 465  */
 466
 467 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 468 {
 469         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 470                         sdp->sd_tune.gt_quota_scale_num,
 471                         sdp->sd_tune.gt_quota_scale_den);
 472 }
 473
 474 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 475                                  size_t len)
 476 {
 477         struct gfs2_tune *gt = &sdp->sd_tune;
 478         unsigned int x, y;
 479
 480         if (!capable(CAP_SYS_ADMIN))
 481                 return -EACCES;
 482
 483         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 484                 return -EINVAL;
 485
 486         spin_lock(&gt->gt_spin);
 487         gt->gt_quota_scale_num = x;
 488         gt->gt_quota_scale_den = y;
 489         spin_unlock(&gt->gt_spin);
 490         return len;
 491 }
 492
 493 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 494                         int check_zero, const char *buf, size_t len)
 495 {
 496         struct gfs2_tune *gt = &sdp->sd_tune;
 497         unsigned int x;
 498
 499         if (!capable(CAP_SYS_ADMIN))
 500                 return -EACCES;
 501
 502         x = simple_strtoul(buf, NULL, 0);
 503
 504         if (check_zero && !x)
 505                 return -EINVAL;
 506
 507         spin_lock(&gt->gt_spin);
 508         *field = x;
 509         spin_unlock(&gt->gt_spin);
 510         return len;
 511 }
 512
 513 #define TUNE_ATTR_3(name, show, store)                                        \
 514 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 515
 516 #define TUNE_ATTR_2(name, store)                                              \
 517 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 518 {                                                                             \
 519         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 520 }                                                                             \
 521 TUNE_ATTR_3(name, name##_show, store)
 522
 523 #define TUNE_ATTR(name, check_zero)                                           \
 524 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 525 {                                                                             \
 526         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 527 }                                                                             \
 528 TUNE_ATTR_2(name, name##_store)
 529
 530 TUNE_ATTR(quota_warn_period, 0);
 531 TUNE_ATTR(quota_quantum, 0);
 532 TUNE_ATTR(max_readahead, 0);
 533 TUNE_ATTR(complain_secs, 0);
 534 TUNE_ATTR(statfs_slow, 0);
 535 TUNE_ATTR(new_files_jdata, 0);
 536 TUNE_ATTR(quota_simul_sync, 1);
 537 TUNE_ATTR(statfs_quantum, 1);
 538 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 539
 540 static struct attribute *tune_attrs[] = {
 541         &tune_attr_quota_warn_period.attr,
 542         &tune_attr_quota_quantum.attr,
 543         &tune_attr_max_readahead.attr,
 544         &tune_attr_complain_secs.attr,
 545         &tune_attr_statfs_slow.attr,
 546         &tune_attr_quota_simul_sync.attr,
 547         &tune_attr_statfs_quantum.attr,
 548         &tune_attr_quota_scale.attr,
 549         &tune_attr_new_files_jdata.attr,
 550         NULL,
 551 };
 552
 553 static struct attribute_group tune_group = {
 554         .name = "tune",
 555         .attrs = tune_attrs,
 556 };
 557
 558 static struct attribute_group lock_module_group = {
 559         .name = "lock_module",
 560         .attrs = lock_module_attrs,
 561 };
 562
 563 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 564 {
 565         struct super_block *sb = sdp->sd_vfs;
 566         int error;
 567         char ro[20];
 568         char spectator[20];
 569         char *envp[] = { ro, spectator, NULL };
 570
 571         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
 572         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 573
 574         sdp->sd_kobj.kset = gfs2_kset;
 575         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 576                                      "%s", sdp->sd_table_name);
 577         if (error)
 578                 goto fail;
 579
 580         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 581         if (error)
 582                 goto fail_reg;
 583
 584         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 585         if (error)
 586                 goto fail_tune;
 587
 588         error = sysfs_create_link(&sdp->sd_kobj,
 589                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 590                                   "device");
 591         if (error)
 592                 goto fail_lock_module;
 593
 594         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 595         return 0;
 596
 597 fail_lock_module:
 598         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 599 fail_tune:
 600         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 601 fail_reg:
 602         kobject_put(&sdp->sd_kobj);
 603 fail:
 604         fs_err(sdp, "error %d adding sysfs files", error);
 605         return error;
 606 }
 607
 608 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 609 {
 610         sysfs_remove_link(&sdp->sd_kobj, "device");
 611         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 612         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 613         kobject_put(&sdp->sd_kobj);
 614 }
 615
 616 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 617                        struct kobj_uevent_env *env)
 618 {
 619         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 620         struct super_block *s = sdp->sd_vfs;
 621         const u8 *uuid = s->s_uuid;
 622
 623         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 624         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 625         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 626                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 627         if (gfs2_uuid_valid(uuid))
 628                 add_uevent_var(env, "UUID=%pUB", uuid);
 629         return 0;
 630 }
 631
 632 static const struct kset_uevent_ops gfs2_uevent_ops = {
 633         .uevent = gfs2_uevent,
 634 };
 635
 636 int gfs2_sys_init(void)
 637 {
 638         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 639         if (!gfs2_kset)
 640                 return -ENOMEM;
 641         return 0;
 642 }
 643
 644 void gfs2_sys_uninit(void)
 645 {
 646         kset_unregister(gfs2_kset);
 647 }
 648