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