SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/module.h>
  16 #include <linux/kobject.h>
  17 #include <asm/uaccess.h>
  18 #include <linux/gfs2_ondisk.h>
  19 #include <linux/genhd.h>
  20
  21 #include "gfs2.h"
  22 #include "incore.h"
  23 #include "sys.h"
  24 #include "super.h"
  25 #include "glock.h"
  26 #include "quota.h"
  27 #include "util.h"
  28 #include "glops.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 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, "%02X%02X%02X%02X-%02X%02X-"
  89                         "%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\n",
  90                         uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5],
  91                         uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11],
  92                         uuid[12], uuid[13], uuid[14], uuid[15]);
  93 }
  94
  95 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  96 {
  97         unsigned int count;
  98
  99         mutex_lock(&sdp->sd_freeze_lock);
 100         count = sdp->sd_freeze_count;
 101         mutex_unlock(&sdp->sd_freeze_lock);
 102
 103         return snprintf(buf, PAGE_SIZE, "%u\n", count);
 104 }
 105
 106 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 107 {
 108         ssize_t ret = len;
 109         int error = 0;
 110         int n = simple_strtol(buf, NULL, 0);
 111
 112         if (!capable(CAP_SYS_ADMIN))
 113                 return -EACCES;
 114
 115         switch (n) {
 116         case 0:
 117                 gfs2_unfreeze_fs(sdp);
 118                 break;
 119         case 1:
 120                 error = gfs2_freeze_fs(sdp);
 121                 break;
 122         default:
 123                 ret = -EINVAL;
 124         }
 125
 126         if (error)
 127                 fs_warn(sdp, "freeze %d error %d", n, error);
 128
 129         return ret;
 130 }
 131
 132 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 133 {
 134         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
 135         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 136 }
 137
 138 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 139 {
 140         if (!capable(CAP_SYS_ADMIN))
 141                 return -EACCES;
 142
 143         if (simple_strtol(buf, NULL, 0) != 1)
 144                 return -EINVAL;
 145
 146         gfs2_lm_withdraw(sdp,
 147                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
 148                 sdp->sd_fsname);
 149         return len;
 150 }
 151
 152 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 153                                  size_t len)
 154 {
 155         if (!capable(CAP_SYS_ADMIN))
 156                 return -EACCES;
 157
 158         if (simple_strtol(buf, NULL, 0) != 1)
 159                 return -EINVAL;
 160
 161         gfs2_statfs_sync(sdp->sd_vfs, 0);
 162         return len;
 163 }
 164
 165 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 166                                 size_t len)
 167 {
 168         if (!capable(CAP_SYS_ADMIN))
 169                 return -EACCES;
 170
 171         if (simple_strtol(buf, NULL, 0) != 1)
 172                 return -EINVAL;
 173
 174         gfs2_quota_sync(sdp->sd_vfs, 0);
 175         return len;
 176 }
 177
 178 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 179                                         size_t len)
 180 {
 181         int error;
 182         u32 id;
 183
 184         if (!capable(CAP_SYS_ADMIN))
 185                 return -EACCES;
 186
 187         id = simple_strtoul(buf, NULL, 0);
 188
 189         error = gfs2_quota_refresh(sdp, 1, id);
 190         return error ? error : len;
 191 }
 192
 193 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 194                                          size_t len)
 195 {
 196         int error;
 197         u32 id;
 198
 199         if (!capable(CAP_SYS_ADMIN))
 200                 return -EACCES;
 201
 202         id = simple_strtoul(buf, NULL, 0);
 203
 204         error = gfs2_quota_refresh(sdp, 0, id);
 205         return error ? error : len;
 206 }
 207
 208 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 209 {
 210         struct gfs2_glock *gl;
 211         const struct gfs2_glock_operations *glops;
 212         unsigned int glmode;
 213         unsigned int gltype;
 214         unsigned long long glnum;
 215         char mode[16];
 216         int rv;
 217
 218         if (!capable(CAP_SYS_ADMIN))
 219                 return -EACCES;
 220
 221         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 222                     mode);
 223         if (rv != 3)
 224                 return -EINVAL;
 225
 226         if (strcmp(mode, "EX") == 0)
 227                 glmode = LM_ST_UNLOCKED;
 228         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 229                 glmode = LM_ST_DEFERRED;
 230         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 231                 glmode = LM_ST_SHARED;
 232         else
 233                 return -EINVAL;
 234
 235         if (gltype > LM_TYPE_JOURNAL)
 236                 return -EINVAL;
 237         glops = gfs2_glops_list[gltype];
 238         if (glops == NULL)
 239                 return -EINVAL;
 240         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 241         if (rv)
 242                 return rv;
 243         gfs2_glock_cb(gl, glmode);
 244         gfs2_glock_put(gl);
 245         return len;
 246 }
 247
 248
 249 #define GFS2_ATTR(name, mode, show, store) \
 250 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 251
 252 GFS2_ATTR(id,                  0444, id_show,       NULL);
 253 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 254 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 255 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 256 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 257 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 258 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 259 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 260 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 261 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 262
 263 static struct attribute *gfs2_attrs[] = {
 264         &gfs2_attr_id.attr,
 265         &gfs2_attr_fsname.attr,
 266         &gfs2_attr_uuid.attr,
 267         &gfs2_attr_freeze.attr,
 268         &gfs2_attr_withdraw.attr,
 269         &gfs2_attr_statfs_sync.attr,
 270         &gfs2_attr_quota_sync.attr,
 271         &gfs2_attr_quota_refresh_user.attr,
 272         &gfs2_attr_quota_refresh_group.attr,
 273         &gfs2_attr_demote_rq.attr,
 274         NULL,
 275 };
 276
 277 static struct kobj_type gfs2_ktype = {
 278         .default_attrs = gfs2_attrs,
 279         .sysfs_ops     = &gfs2_attr_ops,
 280 };
 281
 282
 283 /*
 284  * lock_module. Originally from lock_dlm
 285  */
 286
 287 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 288 {
 289         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 290         return sprintf(buf, "%s\n", ops->lm_proto_name);
 291 }
 292
 293 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 294 {
 295         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 296         ssize_t ret;
 297         int val = 0;
 298
 299         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
 300                 val = 1;
 301         ret = sprintf(buf, "%d\n", val);
 302         return ret;
 303 }
 304
 305 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 306 {
 307         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 308         ssize_t ret = len;
 309         int val;
 310
 311         val = simple_strtol(buf, NULL, 0);
 312
 313         if (val == 1)
 314                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
 315         else if (val == 0) {
 316                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
 317                 smp_mb__after_clear_bit();
 318                 gfs2_glock_thaw(sdp);
 319         } else {
 320                 ret = -EINVAL;
 321         }
 322         return ret;
 323 }
 324
 325 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 326 {
 327         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 328         return sprintf(buf, "%d\n", ls->ls_first);
 329 }
 330
 331 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 332 {
 333         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 334         return sprintf(buf, "%d\n", ls->ls_first_done);
 335 }
 336
 337 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 338 {
 339         unsigned jid;
 340         struct gfs2_jdesc *jd;
 341         int rv;
 342
 343         rv = sscanf(buf, "%u", &jid);
 344         if (rv != 1)
 345                 return -EINVAL;
 346
 347         rv = -ESHUTDOWN;
 348         spin_lock(&sdp->sd_jindex_spin);
 349         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
 350                 goto out;
 351         rv = -EBUSY;
 352         if (sdp->sd_jdesc->jd_jid == jid)
 353                 goto out;
 354         rv = -ENOENT;
 355         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 356                 if (jd->jd_jid != jid)
 357                         continue;
 358                 rv = slow_work_enqueue(&jd->jd_work);
 359                 break;
 360         }
 361 out:
 362         spin_unlock(&sdp->sd_jindex_spin);
 363         return rv ? rv : len;
 364 }
 365
 366 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 367 {
 368         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 369         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 370 }
 371
 372 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 373 {
 374         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 375         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 376 }
 377
 378 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 379 {
 380         return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
 381 }
 382
 383 #define GDLM_ATTR(_name,_mode,_show,_store) \
 384 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 385
 386 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 387 GDLM_ATTR(block,                0644, block_show,               block_store);
 388 GDLM_ATTR(withdraw,             0644, withdraw_show,            withdraw_store);
 389 GDLM_ATTR(jid,                  0444, jid_show,                 NULL);
 390 GDLM_ATTR(first,                0444, lkfirst_show,             NULL);
 391 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 392 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 393 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 394 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 395
 396 static struct attribute *lock_module_attrs[] = {
 397         &gdlm_attr_proto_name.attr,
 398         &gdlm_attr_block.attr,
 399         &gdlm_attr_withdraw.attr,
 400         &gdlm_attr_jid.attr,
 401         &gdlm_attr_first.attr,
 402         &gdlm_attr_first_done.attr,
 403         &gdlm_attr_recover.attr,
 404         &gdlm_attr_recover_done.attr,
 405         &gdlm_attr_recover_status.attr,
 406         NULL,
 407 };
 408
 409 /*
 410  * get and set struct gfs2_tune fields
 411  */
 412
 413 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 414 {
 415         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 416                         sdp->sd_tune.gt_quota_scale_num,
 417                         sdp->sd_tune.gt_quota_scale_den);
 418 }
 419
 420 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 421                                  size_t len)
 422 {
 423         struct gfs2_tune *gt = &sdp->sd_tune;
 424         unsigned int x, y;
 425
 426         if (!capable(CAP_SYS_ADMIN))
 427                 return -EACCES;
 428
 429         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 430                 return -EINVAL;
 431
 432         spin_lock(&gt->gt_spin);
 433         gt->gt_quota_scale_num = x;
 434         gt->gt_quota_scale_den = y;
 435         spin_unlock(&gt->gt_spin);
 436         return len;
 437 }
 438
 439 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 440                         int check_zero, const char *buf, size_t len)
 441 {
 442         struct gfs2_tune *gt = &sdp->sd_tune;
 443         unsigned int x;
 444
 445         if (!capable(CAP_SYS_ADMIN))
 446                 return -EACCES;
 447
 448         x = simple_strtoul(buf, NULL, 0);
 449
 450         if (check_zero && !x)
 451                 return -EINVAL;
 452
 453         spin_lock(&gt->gt_spin);
 454         *field = x;
 455         spin_unlock(&gt->gt_spin);
 456         return len;
 457 }
 458
 459 #define TUNE_ATTR_3(name, show, store)                                        \
 460 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 461
 462 #define TUNE_ATTR_2(name, store)                                              \
 463 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 464 {                                                                             \
 465         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 466 }                                                                             \
 467 TUNE_ATTR_3(name, name##_show, store)
 468
 469 #define TUNE_ATTR(name, check_zero)                                           \
 470 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 471 {                                                                             \
 472         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 473 }                                                                             \
 474 TUNE_ATTR_2(name, name##_store)
 475
 476 TUNE_ATTR(incore_log_blocks, 0);
 477 TUNE_ATTR(log_flush_secs, 0);
 478 TUNE_ATTR(quota_warn_period, 0);
 479 TUNE_ATTR(quota_quantum, 0);
 480 TUNE_ATTR(max_readahead, 0);
 481 TUNE_ATTR(complain_secs, 0);
 482 TUNE_ATTR(statfs_slow, 0);
 483 TUNE_ATTR(new_files_jdata, 0);
 484 TUNE_ATTR(quota_simul_sync, 1);
 485 TUNE_ATTR(stall_secs, 1);
 486 TUNE_ATTR(statfs_quantum, 1);
 487 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 488
 489 static struct attribute *tune_attrs[] = {
 490         &tune_attr_incore_log_blocks.attr,
 491         &tune_attr_log_flush_secs.attr,
 492         &tune_attr_quota_warn_period.attr,
 493         &tune_attr_quota_quantum.attr,
 494         &tune_attr_max_readahead.attr,
 495         &tune_attr_complain_secs.attr,
 496         &tune_attr_statfs_slow.attr,
 497         &tune_attr_quota_simul_sync.attr,
 498         &tune_attr_stall_secs.attr,
 499         &tune_attr_statfs_quantum.attr,
 500         &tune_attr_quota_scale.attr,
 501         &tune_attr_new_files_jdata.attr,
 502         NULL,
 503 };
 504
 505 static struct attribute_group tune_group = {
 506         .name = "tune",
 507         .attrs = tune_attrs,
 508 };
 509
 510 static struct attribute_group lock_module_group = {
 511         .name = "lock_module",
 512         .attrs = lock_module_attrs,
 513 };
 514
 515 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 516 {
 517         struct super_block *sb = sdp->sd_vfs;
 518         int error;
 519         char ro[20];
 520         char spectator[20];
 521         char *envp[] = { ro, spectator, NULL };
 522
 523         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
 524         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 525
 526         sdp->sd_kobj.kset = gfs2_kset;
 527         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 528                                      "%s", sdp->sd_table_name);
 529         if (error)
 530                 goto fail;
 531
 532         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 533         if (error)
 534                 goto fail_reg;
 535
 536         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 537         if (error)
 538                 goto fail_tune;
 539
 540         error = sysfs_create_link(&sdp->sd_kobj,
 541                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 542                                   "device");
 543         if (error)
 544                 goto fail_lock_module;
 545
 546         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 547         return 0;
 548
 549 fail_lock_module:
 550         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 551 fail_tune:
 552         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 553 fail_reg:
 554         kobject_put(&sdp->sd_kobj);
 555 fail:
 556         fs_err(sdp, "error %d adding sysfs files", error);
 557         return error;
 558 }
 559
 560 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 561 {
 562         sysfs_remove_link(&sdp->sd_kobj, "device");
 563         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 564         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 565         kobject_put(&sdp->sd_kobj);
 566 }
 567
 568 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 569                        struct kobj_uevent_env *env)
 570 {
 571         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 572         const u8 *uuid = sdp->sd_sb.sb_uuid;
 573
 574         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 575         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 576         if (!sdp->sd_args.ar_spectator)
 577                 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid);
 578         if (gfs2_uuid_valid(uuid)) {
 579                 add_uevent_var(env, "UUID=%02X%02X%02X%02X-%02X%02X-%02X%02X-"
 580                                "%02X%02X-%02X%02X%02X%02X%02X%02X",
 581                                uuid[0], uuid[1], uuid[2], uuid[3], uuid[4],
 582                                uuid[5], uuid[6], uuid[7], uuid[8], uuid[9],
 583                                uuid[10], uuid[11], uuid[12], uuid[13],
 584                                uuid[14], uuid[15]);
 585         }
 586         return 0;
 587 }
 588
 589 static struct kset_uevent_ops gfs2_uevent_ops = {
 590         .uevent = gfs2_uevent,
 591 };
 592
 593 int gfs2_sys_init(void)
 594 {
 595         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 596         if (!gfs2_kset)
 597                 return -ENOMEM;
 598         return 0;
 599 }
 600
 601 void gfs2_sys_uninit(void)
 602 {
 603         kset_unregister(gfs2_kset);
 604 }
 605