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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/sched.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/completion.h>
  15 #include <linux/buffer_head.h>
  16 #include <linux/module.h>
  17 #include <linux/kobject.h>
  18 #include <asm/uaccess.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/genhd.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "sys.h"
  25 #include "super.h"
  26 #include "glock.h"
  27 #include "quota.h"
  28 #include "util.h"
  29 #include "glops.h"
  30 #include "recovery.h"
  31
  32 struct gfs2_attr {
  33         struct attribute attr;
  34         ssize_t (*show)(struct gfs2_sbd *, char *);
  35         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
  36 };
  37
  38 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
  39                               char *buf)
  40 {
  41         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
  42         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
  43         return a->show ? a->show(sdp, buf) : 0;
  44 }
  45
  46 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
  47                                const char *buf, size_t len)
  48 {
  49         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
  50         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
  51         return a->store ? a->store(sdp, buf, len) : len;
  52 }
  53
  54 static const struct sysfs_ops gfs2_attr_ops = {
  55         .show  = gfs2_attr_show,
  56         .store = gfs2_attr_store,
  57 };
  58
  59
  60 static struct kset *gfs2_kset;
  61
  62 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  63 {
  64         return snprintf(buf, PAGE_SIZE, "%u:%u\n",
  65                         MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
  66 }
  67
  68 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  69 {
  70         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
  71 }
  72
  73 static int gfs2_uuid_valid(const u8 *uuid)
  74 {
  75         int i;
  76
  77         for (i = 0; i < 16; i++) {
  78                 if (uuid[i])
  79                         return 1;
  80         }
  81         return 0;
  82 }
  83
  84 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
  85 {
  86         struct super_block *s = sdp->sd_vfs;
  87         const u8 *uuid = s->s_uuid;
  88         buf[0] = '\0';
  89         if (!gfs2_uuid_valid(uuid))
  90                 return 0;
  91         return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
  92 }
  93
  94 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  95 {
  96         struct super_block *sb = sdp->sd_vfs;
  97         int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
  98
  99         return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
 100 }
 101
 102 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 103 {
 104         int error;
 105         int n = simple_strtol(buf, NULL, 0);
 106
 107         if (!capable(CAP_SYS_ADMIN))
 108                 return -EPERM;
 109
 110         switch (n) {
 111         case 0:
 112                 error = thaw_super(sdp->sd_vfs);
 113                 break;
 114         case 1:
 115                 error = freeze_super(sdp->sd_vfs);
 116                 break;
 117         default:
 118                 return -EINVAL;
 119         }
 120
 121         if (error) {
 122                 fs_warn(sdp, "freeze %d error %d", n, error);
 123                 return error;
 124         }
 125
 126         return len;
 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 -EPERM;
 139
 140         if (simple_strtol(buf, NULL, 0) != 1)
 141                 return -EINVAL;
 142
 143         gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n");
 144
 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 -EPERM;
 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 -EPERM;
 166
 167         if (simple_strtol(buf, NULL, 0) != 1)
 168                 return -EINVAL;
 169
 170         gfs2_quota_sync(sdp->sd_vfs, 0);
 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         struct kqid qid;
 178         int error;
 179         u32 id;
 180
 181         if (!capable(CAP_SYS_ADMIN))
 182                 return -EPERM;
 183
 184         id = simple_strtoul(buf, NULL, 0);
 185
 186         qid = make_kqid(current_user_ns(), USRQUOTA, id);
 187         if (!qid_valid(qid))
 188                 return -EINVAL;
 189
 190         error = gfs2_quota_refresh(sdp, qid);
 191         return error ? error : len;
 192 }
 193
 194 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 195                                          size_t len)
 196 {
 197         struct kqid qid;
 198         int error;
 199         u32 id;
 200
 201         if (!capable(CAP_SYS_ADMIN))
 202                 return -EPERM;
 203
 204         id = simple_strtoul(buf, NULL, 0);
 205
 206         qid = make_kqid(current_user_ns(), GRPQUOTA, id);
 207         if (!qid_valid(qid))
 208                 return -EINVAL;
 209
 210         error = gfs2_quota_refresh(sdp, qid);
 211         return error ? error : len;
 212 }
 213
 214 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 215 {
 216         struct gfs2_glock *gl;
 217         const struct gfs2_glock_operations *glops;
 218         unsigned int glmode;
 219         unsigned int gltype;
 220         unsigned long long glnum;
 221         char mode[16];
 222         int rv;
 223
 224         if (!capable(CAP_SYS_ADMIN))
 225                 return -EPERM;
 226
 227         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 228                     mode);
 229         if (rv != 3)
 230                 return -EINVAL;
 231
 232         if (strcmp(mode, "EX") == 0)
 233                 glmode = LM_ST_UNLOCKED;
 234         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 235                 glmode = LM_ST_DEFERRED;
 236         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 237                 glmode = LM_ST_SHARED;
 238         else
 239                 return -EINVAL;
 240
 241         if (gltype > LM_TYPE_JOURNAL)
 242                 return -EINVAL;
 243         if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
 244                 glops = &gfs2_freeze_glops;
 245         else
 246                 glops = gfs2_glops_list[gltype];
 247         if (glops == NULL)
 248                 return -EINVAL;
 249         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 250                 fs_info(sdp, "demote interface used\n");
 251         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 252         if (rv)
 253                 return rv;
 254         gfs2_glock_cb(gl, glmode);
 255         gfs2_glock_put(gl);
 256         return len;
 257 }
 258
 259
 260 #define GFS2_ATTR(name, mode, show, store) \
 261 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 262
 263 GFS2_ATTR(id,                  0444, id_show,       NULL);
 264 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 265 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 266 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 267 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 268 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 269 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 270 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 271 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 272 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 273
 274 static struct attribute *gfs2_attrs[] = {
 275         &gfs2_attr_id.attr,
 276         &gfs2_attr_fsname.attr,
 277         &gfs2_attr_uuid.attr,
 278         &gfs2_attr_freeze.attr,
 279         &gfs2_attr_withdraw.attr,
 280         &gfs2_attr_statfs_sync.attr,
 281         &gfs2_attr_quota_sync.attr,
 282         &gfs2_attr_quota_refresh_user.attr,
 283         &gfs2_attr_quota_refresh_group.attr,
 284         &gfs2_attr_demote_rq.attr,
 285         NULL,
 286 };
 287
 288 static void gfs2_sbd_release(struct kobject *kobj)
 289 {
 290         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 291
 292         kfree(sdp);
 293 }
 294
 295 static struct kobj_type gfs2_ktype = {
 296         .release = gfs2_sbd_release,
 297         .default_attrs = gfs2_attrs,
 298         .sysfs_ops     = &gfs2_attr_ops,
 299 };
 300
 301
 302 /*
 303  * lock_module. Originally from lock_dlm
 304  */
 305
 306 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 307 {
 308         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 309         return sprintf(buf, "%s\n", ops->lm_proto_name);
 310 }
 311
 312 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 313 {
 314         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 315         ssize_t ret;
 316         int val = 0;
 317
 318         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
 319                 val = 1;
 320         ret = sprintf(buf, "%d\n", val);
 321         return ret;
 322 }
 323
 324 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 325 {
 326         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 327         ssize_t ret = len;
 328         int val;
 329
 330         val = simple_strtol(buf, NULL, 0);
 331
 332         if (val == 1)
 333                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 334         else if (val == 0) {
 335                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 336                 smp_mb__after_atomic();
 337                 gfs2_glock_thaw(sdp);
 338         } else {
 339                 ret = -EINVAL;
 340         }
 341         return ret;
 342 }
 343
 344 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
 345 {
 346         int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
 347
 348         return sprintf(buf, "%d\n", val);
 349 }
 350
 351 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 352 {
 353         ssize_t ret = len;
 354         int val;
 355
 356         val = simple_strtol(buf, NULL, 0);
 357
 358         if ((val == 1) &&
 359             !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 360                 complete(&sdp->sd_wdack);
 361         else
 362                 ret = -EINVAL;
 363         return ret;
 364 }
 365
 366 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 367 {
 368         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 369         return sprintf(buf, "%d\n", ls->ls_first);
 370 }
 371
 372 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 373 {
 374         unsigned first;
 375         int rv;
 376
 377         rv = sscanf(buf, "%u", &first);
 378         if (rv != 1 || first > 1)
 379                 return -EINVAL;
 380         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 381         if (rv)
 382                 return rv;
 383         spin_lock(&sdp->sd_jindex_spin);
 384         rv = -EBUSY;
 385         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 386                 goto out;
 387         rv = -EINVAL;
 388         if (sdp->sd_args.ar_spectator)
 389                 goto out;
 390         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 391                 goto out;
 392         sdp->sd_lockstruct.ls_first = first;
 393         rv = 0;
 394 out:
 395         spin_unlock(&sdp->sd_jindex_spin);
 396         return rv ? rv : len;
 397 }
 398
 399 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 400 {
 401         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 402         return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
 403 }
 404
 405 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
 406 {
 407         struct gfs2_jdesc *jd;
 408         int rv;
 409
 410         /* Wait for our primary journal to be initialized */
 411         wait_for_completion(&sdp->sd_journal_ready);
 412
 413         spin_lock(&sdp->sd_jindex_spin);
 414         rv = -EBUSY;
 415         if (sdp->sd_jdesc->jd_jid == jid)
 416                 goto out;
 417         rv = -ENOENT;
 418         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 419                 if (jd->jd_jid != jid)
 420                         continue;
 421                 rv = gfs2_recover_journal(jd, false);
 422                 break;
 423         }
 424 out:
 425         spin_unlock(&sdp->sd_jindex_spin);
 426         return rv;
 427 }
 428
 429 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 430 {
 431         unsigned jid;
 432         int rv;
 433
 434         rv = sscanf(buf, "%u", &jid);
 435         if (rv != 1)
 436                 return -EINVAL;
 437
 438         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 439                 rv = -ESHUTDOWN;
 440                 goto out;
 441         }
 442
 443         rv = gfs2_recover_set(sdp, jid);
 444 out:
 445         return rv ? rv : len;
 446 }
 447
 448 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 449 {
 450         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 451         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 452 }
 453
 454 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 455 {
 456         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 457         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 458 }
 459
 460 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 461 {
 462         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 463 }
 464
 465 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 466 {
 467         int jid;
 468         int rv;
 469
 470         rv = sscanf(buf, "%d", &jid);
 471         if (rv != 1)
 472                 return -EINVAL;
 473         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 474         if (rv)
 475                 return rv;
 476         spin_lock(&sdp->sd_jindex_spin);
 477         rv = -EINVAL;
 478         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 479                 goto out;
 480         rv = -EBUSY;
 481         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 482                 goto out;
 483         rv = 0;
 484         if (sdp->sd_args.ar_spectator && jid > 0)
 485                 rv = jid = -EINVAL;
 486         sdp->sd_lockstruct.ls_jid = jid;
 487         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 488         smp_mb__after_atomic();
 489         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 490 out:
 491         spin_unlock(&sdp->sd_jindex_spin);
 492         return rv ? rv : len;
 493 }
 494
 495 #define GDLM_ATTR(_name,_mode,_show,_store) \
 496 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 497
 498 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 499 GDLM_ATTR(block,                0644, block_show,               block_store);
 500 GDLM_ATTR(withdraw,             0644, wdack_show,               wdack_store);
 501 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 502 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 503 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 504 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 505 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 506 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 507
 508 static struct attribute *lock_module_attrs[] = {
 509         &gdlm_attr_proto_name.attr,
 510         &gdlm_attr_block.attr,
 511         &gdlm_attr_withdraw.attr,
 512         &gdlm_attr_jid.attr,
 513         &gdlm_attr_first.attr,
 514         &gdlm_attr_first_done.attr,
 515         &gdlm_attr_recover.attr,
 516         &gdlm_attr_recover_done.attr,
 517         &gdlm_attr_recover_status.attr,
 518         NULL,
 519 };
 520
 521 /*
 522  * get and set struct gfs2_tune fields
 523  */
 524
 525 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 526 {
 527         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 528                         sdp->sd_tune.gt_quota_scale_num,
 529                         sdp->sd_tune.gt_quota_scale_den);
 530 }
 531
 532 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 533                                  size_t len)
 534 {
 535         struct gfs2_tune *gt = &sdp->sd_tune;
 536         unsigned int x, y;
 537
 538         if (!capable(CAP_SYS_ADMIN))
 539                 return -EPERM;
 540
 541         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 542                 return -EINVAL;
 543
 544         spin_lock(&gt->gt_spin);
 545         gt->gt_quota_scale_num = x;
 546         gt->gt_quota_scale_den = y;
 547         spin_unlock(&gt->gt_spin);
 548         return len;
 549 }
 550
 551 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 552                         int check_zero, const char *buf, size_t len)
 553 {
 554         struct gfs2_tune *gt = &sdp->sd_tune;
 555         unsigned int x;
 556
 557         if (!capable(CAP_SYS_ADMIN))
 558                 return -EPERM;
 559
 560         x = simple_strtoul(buf, NULL, 0);
 561
 562         if (check_zero && !x)
 563                 return -EINVAL;
 564
 565         spin_lock(&gt->gt_spin);
 566         *field = x;
 567         spin_unlock(&gt->gt_spin);
 568         return len;
 569 }
 570
 571 #define TUNE_ATTR_3(name, show, store)                                        \
 572 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 573
 574 #define TUNE_ATTR_2(name, store)                                              \
 575 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 576 {                                                                             \
 577         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 578 }                                                                             \
 579 TUNE_ATTR_3(name, name##_show, store)
 580
 581 #define TUNE_ATTR(name, check_zero)                                           \
 582 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 583 {                                                                             \
 584         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 585 }                                                                             \
 586 TUNE_ATTR_2(name, name##_store)
 587
 588 TUNE_ATTR(quota_warn_period, 0);
 589 TUNE_ATTR(quota_quantum, 0);
 590 TUNE_ATTR(max_readahead, 0);
 591 TUNE_ATTR(complain_secs, 0);
 592 TUNE_ATTR(statfs_slow, 0);
 593 TUNE_ATTR(new_files_jdata, 0);
 594 TUNE_ATTR(statfs_quantum, 1);
 595 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 596
 597 static struct attribute *tune_attrs[] = {
 598         &tune_attr_quota_warn_period.attr,
 599         &tune_attr_quota_quantum.attr,
 600         &tune_attr_max_readahead.attr,
 601         &tune_attr_complain_secs.attr,
 602         &tune_attr_statfs_slow.attr,
 603         &tune_attr_statfs_quantum.attr,
 604         &tune_attr_quota_scale.attr,
 605         &tune_attr_new_files_jdata.attr,
 606         NULL,
 607 };
 608
 609 static struct attribute_group tune_group = {
 610         .name = "tune",
 611         .attrs = tune_attrs,
 612 };
 613
 614 static struct attribute_group lock_module_group = {
 615         .name = "lock_module",
 616         .attrs = lock_module_attrs,
 617 };
 618
 619 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 620 {
 621         struct super_block *sb = sdp->sd_vfs;
 622         int error;
 623         char ro[20];
 624         char spectator[20];
 625         char *envp[] = { ro, spectator, NULL };
 626         int sysfs_frees_sdp = 0;
 627
 628         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
 629         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 630
 631         sdp->sd_kobj.kset = gfs2_kset;
 632         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 633                                      "%s", sdp->sd_table_name);
 634         if (error)
 635                 goto fail_reg;
 636
 637         sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
 638                                 function gfs2_sbd_release. */
 639         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 640         if (error)
 641                 goto fail_reg;
 642
 643         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 644         if (error)
 645                 goto fail_tune;
 646
 647         error = sysfs_create_link(&sdp->sd_kobj,
 648                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 649                                   "device");
 650         if (error)
 651                 goto fail_lock_module;
 652
 653         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 654         return 0;
 655
 656 fail_lock_module:
 657         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 658 fail_tune:
 659         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 660 fail_reg:
 661         free_percpu(sdp->sd_lkstats);
 662         fs_err(sdp, "error %d adding sysfs files", error);
 663         if (sysfs_frees_sdp)
 664                 kobject_put(&sdp->sd_kobj);
 665         else
 666                 kfree(sdp);
 667         sb->s_fs_info = NULL;
 668         return error;
 669 }
 670
 671 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 672 {
 673         sysfs_remove_link(&sdp->sd_kobj, "device");
 674         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 675         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 676         kobject_put(&sdp->sd_kobj);
 677 }
 678
 679 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 680                        struct kobj_uevent_env *env)
 681 {
 682         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 683         struct super_block *s = sdp->sd_vfs;
 684         const u8 *uuid = s->s_uuid;
 685
 686         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 687         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 688         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 689                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 690         if (gfs2_uuid_valid(uuid))
 691                 add_uevent_var(env, "UUID=%pUB", uuid);
 692         return 0;
 693 }
 694
 695 static const struct kset_uevent_ops gfs2_uevent_ops = {
 696         .uevent = gfs2_uevent,
 697 };
 698
 699 int gfs2_sys_init(void)
 700 {
 701         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 702         if (!gfs2_kset)
 703                 return -ENOMEM;
 704         return 0;
 705 }
 706
 707 void gfs2_sys_uninit(void)
 708 {
 709         kset_unregister(gfs2_kset);
 710 }
 711