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         struct super_block *sb = sdp->sd_vfs;
  95         int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
  96
  97         return snprintf(buf, PAGE_SIZE, "%u\n", frozen);
  98 }
  99
 100 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 101 {
 102         int error;
 103         int n = simple_strtol(buf, NULL, 0);
 104
 105         if (!capable(CAP_SYS_ADMIN))
 106                 return -EPERM;
 107
 108         switch (n) {
 109         case 0:
 110                 error = thaw_super(sdp->sd_vfs);
 111                 break;
 112         case 1:
 113                 error = freeze_super(sdp->sd_vfs);
 114                 break;
 115         default:
 116                 return -EINVAL;
 117         }
 118
 119         if (error) {
 120                 fs_warn(sdp, "freeze %d error %d", n, error);
 121                 return error;
 122         }
 123
 124         return len;
 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 -EPERM;
 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 -EPERM;
 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 -EPERM;
 165
 166         if (simple_strtol(buf, NULL, 0) != 1)
 167                 return -EINVAL;
 168
 169         gfs2_quota_sync(sdp->sd_vfs, 0);
 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         struct kqid qid;
 177         int error;
 178         u32 id;
 179
 180         if (!capable(CAP_SYS_ADMIN))
 181                 return -EPERM;
 182
 183         id = simple_strtoul(buf, NULL, 0);
 184
 185         qid = make_kqid(current_user_ns(), USRQUOTA, id);
 186         if (!qid_valid(qid))
 187                 return -EINVAL;
 188
 189         error = gfs2_quota_refresh(sdp, qid);
 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         struct kqid qid;
 197         int error;
 198         u32 id;
 199
 200         if (!capable(CAP_SYS_ADMIN))
 201                 return -EPERM;
 202
 203         id = simple_strtoul(buf, NULL, 0);
 204
 205         qid = make_kqid(current_user_ns(), GRPQUOTA, id);
 206         if (!qid_valid(qid))
 207                 return -EINVAL;
 208
 209         error = gfs2_quota_refresh(sdp, qid);
 210         return error ? error : len;
 211 }
 212
 213 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 214 {
 215         struct gfs2_glock *gl;
 216         const struct gfs2_glock_operations *glops;
 217         unsigned int glmode;
 218         unsigned int gltype;
 219         unsigned long long glnum;
 220         char mode[16];
 221         int rv;
 222
 223         if (!capable(CAP_SYS_ADMIN))
 224                 return -EPERM;
 225
 226         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 227                     mode);
 228         if (rv != 3)
 229                 return -EINVAL;
 230
 231         if (strcmp(mode, "EX") == 0)
 232                 glmode = LM_ST_UNLOCKED;
 233         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 234                 glmode = LM_ST_DEFERRED;
 235         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 236                 glmode = LM_ST_SHARED;
 237         else
 238                 return -EINVAL;
 239
 240         if (gltype > LM_TYPE_JOURNAL)
 241                 return -EINVAL;
 242         if (gltype == LM_TYPE_NONDISK && glnum == GFS2_TRANS_LOCK)
 243                 glops = &gfs2_trans_glops;
 244         else
 245                 glops = gfs2_glops_list[gltype];
 246         if (glops == NULL)
 247                 return -EINVAL;
 248         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 249                 fs_info(sdp, "demote interface used\n");
 250         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 251         if (rv)
 252                 return rv;
 253         gfs2_glock_cb(gl, glmode);
 254         gfs2_glock_put(gl);
 255         return len;
 256 }
 257
 258
 259 #define GFS2_ATTR(name, mode, show, store) \
 260 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 261
 262 GFS2_ATTR(id,                  0444, id_show,       NULL);
 263 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 264 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 265 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 266 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 267 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 268 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 269 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 270 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 271 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 272
 273 static struct attribute *gfs2_attrs[] = {
 274         &gfs2_attr_id.attr,
 275         &gfs2_attr_fsname.attr,
 276         &gfs2_attr_uuid.attr,
 277         &gfs2_attr_freeze.attr,
 278         &gfs2_attr_withdraw.attr,
 279         &gfs2_attr_statfs_sync.attr,
 280         &gfs2_attr_quota_sync.attr,
 281         &gfs2_attr_quota_refresh_user.attr,
 282         &gfs2_attr_quota_refresh_group.attr,
 283         &gfs2_attr_demote_rq.attr,
 284         NULL,
 285 };
 286
 287 static void gfs2_sbd_release(struct kobject *kobj)
 288 {
 289         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 290
 291         kfree(sdp);
 292 }
 293
 294 static struct kobj_type gfs2_ktype = {
 295         .release = gfs2_sbd_release,
 296         .default_attrs = gfs2_attrs,
 297         .sysfs_ops     = &gfs2_attr_ops,
 298 };
 299
 300
 301 /*
 302  * lock_module. Originally from lock_dlm
 303  */
 304
 305 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 306 {
 307         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 308         return sprintf(buf, "%s\n", ops->lm_proto_name);
 309 }
 310
 311 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 312 {
 313         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 314         ssize_t ret;
 315         int val = 0;
 316
 317         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
 318                 val = 1;
 319         ret = sprintf(buf, "%d\n", val);
 320         return ret;
 321 }
 322
 323 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 324 {
 325         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 326         ssize_t ret = len;
 327         int val;
 328
 329         val = simple_strtol(buf, NULL, 0);
 330
 331         if (val == 1)
 332                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 333         else if (val == 0) {
 334                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 335                 smp_mb__after_clear_bit();
 336                 gfs2_glock_thaw(sdp);
 337         } else {
 338                 ret = -EINVAL;
 339         }
 340         return ret;
 341 }
 342
 343 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
 344 {
 345         int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
 346
 347         return sprintf(buf, "%d\n", val);
 348 }
 349
 350 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 351 {
 352         ssize_t ret = len;
 353         int val;
 354
 355         val = simple_strtol(buf, NULL, 0);
 356
 357         if ((val == 1) &&
 358             !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 359                 complete(&sdp->sd_wdack);
 360         else
 361                 ret = -EINVAL;
 362         return ret;
 363 }
 364
 365 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 366 {
 367         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 368         return sprintf(buf, "%d\n", ls->ls_first);
 369 }
 370
 371 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 372 {
 373         unsigned first;
 374         int rv;
 375
 376         rv = sscanf(buf, "%u", &first);
 377         if (rv != 1 || first > 1)
 378                 return -EINVAL;
 379         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 380         if (rv)
 381                 return rv;
 382         spin_lock(&sdp->sd_jindex_spin);
 383         rv = -EBUSY;
 384         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 385                 goto out;
 386         rv = -EINVAL;
 387         if (sdp->sd_args.ar_spectator)
 388                 goto out;
 389         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 390                 goto out;
 391         sdp->sd_lockstruct.ls_first = first;
 392         rv = 0;
 393 out:
 394         spin_unlock(&sdp->sd_jindex_spin);
 395         return rv ? rv : len;
 396 }
 397
 398 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 399 {
 400         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 401         return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
 402 }
 403
 404 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
 405 {
 406         struct gfs2_jdesc *jd;
 407         int rv;
 408
 409         spin_lock(&sdp->sd_jindex_spin);
 410         rv = -EBUSY;
 411         if (sdp->sd_jdesc->jd_jid == jid)
 412                 goto out;
 413         rv = -ENOENT;
 414         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 415                 if (jd->jd_jid != jid)
 416                         continue;
 417                 rv = gfs2_recover_journal(jd, false);
 418                 break;
 419         }
 420 out:
 421         spin_unlock(&sdp->sd_jindex_spin);
 422         return rv;
 423 }
 424
 425 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 426 {
 427         unsigned jid;
 428         int rv;
 429
 430         rv = sscanf(buf, "%u", &jid);
 431         if (rv != 1)
 432                 return -EINVAL;
 433
 434         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 435                 rv = -ESHUTDOWN;
 436                 goto out;
 437         }
 438
 439         rv = gfs2_recover_set(sdp, jid);
 440 out:
 441         return rv ? rv : len;
 442 }
 443
 444 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 445 {
 446         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 447         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 448 }
 449
 450 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 451 {
 452         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 453         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 454 }
 455
 456 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 457 {
 458         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 459 }
 460
 461 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 462 {
 463         int jid;
 464         int rv;
 465
 466         rv = sscanf(buf, "%d", &jid);
 467         if (rv != 1)
 468                 return -EINVAL;
 469         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 470         if (rv)
 471                 return rv;
 472         spin_lock(&sdp->sd_jindex_spin);
 473         rv = -EINVAL;
 474         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 475                 goto out;
 476         rv = -EBUSY;
 477         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 478                 goto out;
 479         rv = 0;
 480         if (sdp->sd_args.ar_spectator && jid > 0)
 481                 rv = jid = -EINVAL;
 482         sdp->sd_lockstruct.ls_jid = jid;
 483         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 484         smp_mb__after_clear_bit();
 485         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 486 out:
 487         spin_unlock(&sdp->sd_jindex_spin);
 488         return rv ? rv : len;
 489 }
 490
 491 #define GDLM_ATTR(_name,_mode,_show,_store) \
 492 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 493
 494 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 495 GDLM_ATTR(block,                0644, block_show,               block_store);
 496 GDLM_ATTR(withdraw,             0644, wdack_show,               wdack_store);
 497 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 498 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 499 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 500 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 501 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 502 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 503
 504 static struct attribute *lock_module_attrs[] = {
 505         &gdlm_attr_proto_name.attr,
 506         &gdlm_attr_block.attr,
 507         &gdlm_attr_withdraw.attr,
 508         &gdlm_attr_jid.attr,
 509         &gdlm_attr_first.attr,
 510         &gdlm_attr_first_done.attr,
 511         &gdlm_attr_recover.attr,
 512         &gdlm_attr_recover_done.attr,
 513         &gdlm_attr_recover_status.attr,
 514         NULL,
 515 };
 516
 517 /*
 518  * get and set struct gfs2_tune fields
 519  */
 520
 521 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 522 {
 523         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 524                         sdp->sd_tune.gt_quota_scale_num,
 525                         sdp->sd_tune.gt_quota_scale_den);
 526 }
 527
 528 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 529                                  size_t len)
 530 {
 531         struct gfs2_tune *gt = &sdp->sd_tune;
 532         unsigned int x, y;
 533
 534         if (!capable(CAP_SYS_ADMIN))
 535                 return -EPERM;
 536
 537         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 538                 return -EINVAL;
 539
 540         spin_lock(&gt->gt_spin);
 541         gt->gt_quota_scale_num = x;
 542         gt->gt_quota_scale_den = y;
 543         spin_unlock(&gt->gt_spin);
 544         return len;
 545 }
 546
 547 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 548                         int check_zero, const char *buf, size_t len)
 549 {
 550         struct gfs2_tune *gt = &sdp->sd_tune;
 551         unsigned int x;
 552
 553         if (!capable(CAP_SYS_ADMIN))
 554                 return -EPERM;
 555
 556         x = simple_strtoul(buf, NULL, 0);
 557
 558         if (check_zero && !x)
 559                 return -EINVAL;
 560
 561         spin_lock(&gt->gt_spin);
 562         *field = x;
 563         spin_unlock(&gt->gt_spin);
 564         return len;
 565 }
 566
 567 #define TUNE_ATTR_3(name, show, store)                                        \
 568 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 569
 570 #define TUNE_ATTR_2(name, store)                                              \
 571 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 572 {                                                                             \
 573         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 574 }                                                                             \
 575 TUNE_ATTR_3(name, name##_show, store)
 576
 577 #define TUNE_ATTR(name, check_zero)                                           \
 578 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 579 {                                                                             \
 580         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 581 }                                                                             \
 582 TUNE_ATTR_2(name, name##_store)
 583
 584 TUNE_ATTR(quota_warn_period, 0);
 585 TUNE_ATTR(quota_quantum, 0);
 586 TUNE_ATTR(max_readahead, 0);
 587 TUNE_ATTR(complain_secs, 0);
 588 TUNE_ATTR(statfs_slow, 0);
 589 TUNE_ATTR(new_files_jdata, 0);
 590 TUNE_ATTR(quota_simul_sync, 1);
 591 TUNE_ATTR(statfs_quantum, 1);
 592 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 593
 594 static struct attribute *tune_attrs[] = {
 595         &tune_attr_quota_warn_period.attr,
 596         &tune_attr_quota_quantum.attr,
 597         &tune_attr_max_readahead.attr,
 598         &tune_attr_complain_secs.attr,
 599         &tune_attr_statfs_slow.attr,
 600         &tune_attr_quota_simul_sync.attr,
 601         &tune_attr_statfs_quantum.attr,
 602         &tune_attr_quota_scale.attr,
 603         &tune_attr_new_files_jdata.attr,
 604         NULL,
 605 };
 606
 607 static struct attribute_group tune_group = {
 608         .name = "tune",
 609         .attrs = tune_attrs,
 610 };
 611
 612 static struct attribute_group lock_module_group = {
 613         .name = "lock_module",
 614         .attrs = lock_module_attrs,
 615 };
 616
 617 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 618 {
 619         struct super_block *sb = sdp->sd_vfs;
 620         int error;
 621         char ro[20];
 622         char spectator[20];
 623         char *envp[] = { ro, spectator, NULL };
 624         int sysfs_frees_sdp = 0;
 625
 626         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
 627         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 628
 629         sdp->sd_kobj.kset = gfs2_kset;
 630         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 631                                      "%s", sdp->sd_table_name);
 632         if (error)
 633                 goto fail_reg;
 634
 635         sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
 636                                 function gfs2_sbd_release. */
 637         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 638         if (error)
 639                 goto fail_reg;
 640
 641         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 642         if (error)
 643                 goto fail_tune;
 644
 645         error = sysfs_create_link(&sdp->sd_kobj,
 646                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 647                                   "device");
 648         if (error)
 649                 goto fail_lock_module;
 650
 651         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 652         return 0;
 653
 654 fail_lock_module:
 655         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 656 fail_tune:
 657         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 658 fail_reg:
 659         free_percpu(sdp->sd_lkstats);
 660         fs_err(sdp, "error %d adding sysfs files", error);
 661         if (sysfs_frees_sdp)
 662                 kobject_put(&sdp->sd_kobj);
 663         else
 664                 kfree(sdp);
 665         sb->s_fs_info = NULL;
 666         return error;
 667 }
 668
 669 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 670 {
 671         sysfs_remove_link(&sdp->sd_kobj, "device");
 672         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 673         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 674         kobject_put(&sdp->sd_kobj);
 675 }
 676
 677 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 678                        struct kobj_uevent_env *env)
 679 {
 680         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 681         struct super_block *s = sdp->sd_vfs;
 682         const u8 *uuid = s->s_uuid;
 683
 684         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 685         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 686         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 687                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 688         if (gfs2_uuid_valid(uuid))
 689                 add_uevent_var(env, "UUID=%pUB", uuid);
 690         return 0;
 691 }
 692
 693 static const struct kset_uevent_ops gfs2_uevent_ops = {
 694         .uevent = gfs2_uevent,
 695 };
 696
 697 int gfs2_sys_init(void)
 698 {
 699         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 700         if (!gfs2_kset)
 701                 return -ENOMEM;
 702         return 0;
 703 }
 704
 705 void gfs2_sys_uninit(void)
 706 {
 707         kset_unregister(gfs2_kset);
 708 }
 709