fs/gfs2/sys.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/sched.h>
  10 #include <linux/cred.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 <linux/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 ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
  72 {
  73         struct super_block *s = sdp->sd_vfs;
  74
  75         buf[0] = '\0';
  76         if (uuid_is_null(&s->s_uuid))
  77                 return 0;
  78         return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
  79 }
  80
  81 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  82 {
  83         struct super_block *sb = sdp->sd_vfs;
  84         int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
  85
  86         return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
  87 }
  88
  89 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  90 {
  91         int error, n;
  92
  93         error = kstrtoint(buf, 0, &n);
  94         if (error)
  95                 return error;
  96
  97         if (!capable(CAP_SYS_ADMIN))
  98                 return -EPERM;
  99
 100         switch (n) {
 101         case 0:
 102                 error = thaw_super(sdp->sd_vfs);
 103                 break;
 104         case 1:
 105                 error = freeze_super(sdp->sd_vfs);
 106                 break;
 107         default:
 108                 return -EINVAL;
 109         }
 110
 111         if (error) {
 112                 fs_warn(sdp, "freeze %d error %d\n", n, error);
 113                 return error;
 114         }
 115
 116         return len;
 117 }
 118
 119 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 120 {
 121         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
 122         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 123 }
 124
 125 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 126 {
 127         int error, val;
 128
 129         if (!capable(CAP_SYS_ADMIN))
 130                 return -EPERM;
 131
 132         error = kstrtoint(buf, 0, &val);
 133         if (error)
 134                 return error;
 135
 136         if (val != 1)
 137                 return -EINVAL;
 138
 139         gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n");
 140
 141         return len;
 142 }
 143
 144 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 145                                  size_t len)
 146 {
 147         int error, val;
 148
 149         if (!capable(CAP_SYS_ADMIN))
 150                 return -EPERM;
 151
 152         error = kstrtoint(buf, 0, &val);
 153         if (error)
 154                 return error;
 155
 156         if (val != 1)
 157                 return -EINVAL;
 158
 159         gfs2_statfs_sync(sdp->sd_vfs, 0);
 160         return len;
 161 }
 162
 163 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 164                                 size_t len)
 165 {
 166         int error, val;
 167
 168         if (!capable(CAP_SYS_ADMIN))
 169                 return -EPERM;
 170
 171         error = kstrtoint(buf, 0, &val);
 172         if (error)
 173                 return error;
 174
 175         if (val != 1)
 176                 return -EINVAL;
 177
 178         gfs2_quota_sync(sdp->sd_vfs, 0);
 179         return len;
 180 }
 181
 182 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 183                                         size_t len)
 184 {
 185         struct kqid qid;
 186         int error;
 187         u32 id;
 188
 189         if (!capable(CAP_SYS_ADMIN))
 190                 return -EPERM;
 191
 192         error = kstrtou32(buf, 0, &id);
 193         if (error)
 194                 return error;
 195
 196         qid = make_kqid(current_user_ns(), USRQUOTA, id);
 197         if (!qid_valid(qid))
 198                 return -EINVAL;
 199
 200         error = gfs2_quota_refresh(sdp, qid);
 201         return error ? error : len;
 202 }
 203
 204 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 205                                          size_t len)
 206 {
 207         struct kqid qid;
 208         int error;
 209         u32 id;
 210
 211         if (!capable(CAP_SYS_ADMIN))
 212                 return -EPERM;
 213
 214         error = kstrtou32(buf, 0, &id);
 215         if (error)
 216                 return error;
 217
 218         qid = make_kqid(current_user_ns(), GRPQUOTA, id);
 219         if (!qid_valid(qid))
 220                 return -EINVAL;
 221
 222         error = gfs2_quota_refresh(sdp, qid);
 223         return error ? error : len;
 224 }
 225
 226 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 227 {
 228         struct gfs2_glock *gl;
 229         const struct gfs2_glock_operations *glops;
 230         unsigned int glmode;
 231         unsigned int gltype;
 232         unsigned long long glnum;
 233         char mode[16];
 234         int rv;
 235
 236         if (!capable(CAP_SYS_ADMIN))
 237                 return -EPERM;
 238
 239         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 240                     mode);
 241         if (rv != 3)
 242                 return -EINVAL;
 243
 244         if (strcmp(mode, "EX") == 0)
 245                 glmode = LM_ST_UNLOCKED;
 246         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 247                 glmode = LM_ST_DEFERRED;
 248         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 249                 glmode = LM_ST_SHARED;
 250         else
 251                 return -EINVAL;
 252
 253         if (gltype > LM_TYPE_JOURNAL)
 254                 return -EINVAL;
 255         if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
 256                 glops = &gfs2_freeze_glops;
 257         else
 258                 glops = gfs2_glops_list[gltype];
 259         if (glops == NULL)
 260                 return -EINVAL;
 261         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 262                 fs_info(sdp, "demote interface used\n");
 263         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 264         if (rv)
 265                 return rv;
 266         gfs2_glock_cb(gl, glmode);
 267         gfs2_glock_put(gl);
 268         return len;
 269 }
 270
 271
 272 #define GFS2_ATTR(name, mode, show, store) \
 273 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 274
 275 GFS2_ATTR(id,                  0444, id_show,       NULL);
 276 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 277 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 278 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 279 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 280 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 281 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 282 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 283 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 284 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 285
 286 static struct attribute *gfs2_attrs[] = {
 287         &gfs2_attr_id.attr,
 288         &gfs2_attr_fsname.attr,
 289         &gfs2_attr_uuid.attr,
 290         &gfs2_attr_freeze.attr,
 291         &gfs2_attr_withdraw.attr,
 292         &gfs2_attr_statfs_sync.attr,
 293         &gfs2_attr_quota_sync.attr,
 294         &gfs2_attr_quota_refresh_user.attr,
 295         &gfs2_attr_quota_refresh_group.attr,
 296         &gfs2_attr_demote_rq.attr,
 297         NULL,
 298 };
 299
 300 static void gfs2_sbd_release(struct kobject *kobj)
 301 {
 302         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 303
 304         kfree(sdp);
 305 }
 306
 307 static struct kobj_type gfs2_ktype = {
 308         .release = gfs2_sbd_release,
 309         .default_attrs = gfs2_attrs,
 310         .sysfs_ops     = &gfs2_attr_ops,
 311 };
 312
 313
 314 /*
 315  * lock_module. Originally from lock_dlm
 316  */
 317
 318 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 319 {
 320         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 321         return sprintf(buf, "%s\n", ops->lm_proto_name);
 322 }
 323
 324 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 325 {
 326         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 327         ssize_t ret;
 328         int val = 0;
 329
 330         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
 331                 val = 1;
 332         ret = sprintf(buf, "%d\n", val);
 333         return ret;
 334 }
 335
 336 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 337 {
 338         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 339         int ret, val;
 340
 341         ret = kstrtoint(buf, 0, &val);
 342         if (ret)
 343                 return ret;
 344
 345         if (val == 1)
 346                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 347         else if (val == 0) {
 348                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 349                 smp_mb__after_atomic();
 350                 gfs2_glock_thaw(sdp);
 351         } else {
 352                 return -EINVAL;
 353         }
 354         return len;
 355 }
 356
 357 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
 358 {
 359         int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
 360
 361         return sprintf(buf, "%d\n", val);
 362 }
 363
 364 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 365 {
 366         int ret, val;
 367
 368         ret = kstrtoint(buf, 0, &val);
 369         if (ret)
 370                 return ret;
 371
 372         if ((val == 1) &&
 373             !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 374                 complete(&sdp->sd_wdack);
 375         else
 376                 return -EINVAL;
 377         return len;
 378 }
 379
 380 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 381 {
 382         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 383         return sprintf(buf, "%d\n", ls->ls_first);
 384 }
 385
 386 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 387 {
 388         unsigned first;
 389         int rv;
 390
 391         rv = sscanf(buf, "%u", &first);
 392         if (rv != 1 || first > 1)
 393                 return -EINVAL;
 394         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 395         if (rv)
 396                 return rv;
 397         spin_lock(&sdp->sd_jindex_spin);
 398         rv = -EBUSY;
 399         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 400                 goto out;
 401         rv = -EINVAL;
 402         if (sdp->sd_args.ar_spectator)
 403                 goto out;
 404         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 405                 goto out;
 406         sdp->sd_lockstruct.ls_first = first;
 407         rv = 0;
 408 out:
 409         spin_unlock(&sdp->sd_jindex_spin);
 410         return rv ? rv : len;
 411 }
 412
 413 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 414 {
 415         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 416         return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
 417 }
 418
 419 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
 420 {
 421         struct gfs2_jdesc *jd;
 422         int rv;
 423
 424         /* Wait for our primary journal to be initialized */
 425         wait_for_completion(&sdp->sd_journal_ready);
 426
 427         spin_lock(&sdp->sd_jindex_spin);
 428         rv = -EBUSY;
 429         /**
 430          * If we're a spectator, we use journal0, but it's not really ours.
 431          * So we need to wait for its recovery too. If we skip it we'd never
 432          * queue work to the recovery workqueue, and so its completion would
 433          * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
 434          * permanently stop working.
 435          */
 436         if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
 437                 goto out;
 438         rv = -ENOENT;
 439         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 440                 if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
 441                         continue;
 442                 rv = gfs2_recover_journal(jd, false);
 443                 break;
 444         }
 445 out:
 446         spin_unlock(&sdp->sd_jindex_spin);
 447         return rv;
 448 }
 449
 450 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 451 {
 452         unsigned jid;
 453         int rv;
 454
 455         rv = sscanf(buf, "%u", &jid);
 456         if (rv != 1)
 457                 return -EINVAL;
 458
 459         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 460                 rv = -ESHUTDOWN;
 461                 goto out;
 462         }
 463
 464         rv = gfs2_recover_set(sdp, jid);
 465 out:
 466         return rv ? rv : len;
 467 }
 468
 469 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 470 {
 471         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 472         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 473 }
 474
 475 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 476 {
 477         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 478         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 479 }
 480
 481 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 482 {
 483         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 484 }
 485
 486 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 487 {
 488         int jid;
 489         int rv;
 490
 491         rv = sscanf(buf, "%d", &jid);
 492         if (rv != 1)
 493                 return -EINVAL;
 494         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 495         if (rv)
 496                 return rv;
 497         spin_lock(&sdp->sd_jindex_spin);
 498         rv = -EINVAL;
 499         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 500                 goto out;
 501         rv = -EBUSY;
 502         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 503                 goto out;
 504         rv = 0;
 505         if (sdp->sd_args.ar_spectator && jid > 0)
 506                 rv = jid = -EINVAL;
 507         sdp->sd_lockstruct.ls_jid = jid;
 508         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 509         smp_mb__after_atomic();
 510         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 511 out:
 512         spin_unlock(&sdp->sd_jindex_spin);
 513         return rv ? rv : len;
 514 }
 515
 516 #define GDLM_ATTR(_name,_mode,_show,_store) \
 517 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 518
 519 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 520 GDLM_ATTR(block,                0644, block_show,               block_store);
 521 GDLM_ATTR(withdraw,             0644, wdack_show,               wdack_store);
 522 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 523 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 524 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 525 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 526 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 527 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 528
 529 static struct attribute *lock_module_attrs[] = {
 530         &gdlm_attr_proto_name.attr,
 531         &gdlm_attr_block.attr,
 532         &gdlm_attr_withdraw.attr,
 533         &gdlm_attr_jid.attr,
 534         &gdlm_attr_first.attr,
 535         &gdlm_attr_first_done.attr,
 536         &gdlm_attr_recover.attr,
 537         &gdlm_attr_recover_done.attr,
 538         &gdlm_attr_recover_status.attr,
 539         NULL,
 540 };
 541
 542 /*
 543  * get and set struct gfs2_tune fields
 544  */
 545
 546 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 547 {
 548         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 549                         sdp->sd_tune.gt_quota_scale_num,
 550                         sdp->sd_tune.gt_quota_scale_den);
 551 }
 552
 553 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 554                                  size_t len)
 555 {
 556         struct gfs2_tune *gt = &sdp->sd_tune;
 557         unsigned int x, y;
 558
 559         if (!capable(CAP_SYS_ADMIN))
 560                 return -EPERM;
 561
 562         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 563                 return -EINVAL;
 564
 565         spin_lock(&gt->gt_spin);
 566         gt->gt_quota_scale_num = x;
 567         gt->gt_quota_scale_den = y;
 568         spin_unlock(&gt->gt_spin);
 569         return len;
 570 }
 571
 572 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 573                         int check_zero, const char *buf, size_t len)
 574 {
 575         struct gfs2_tune *gt = &sdp->sd_tune;
 576         unsigned int x;
 577         int error;
 578
 579         if (!capable(CAP_SYS_ADMIN))
 580                 return -EPERM;
 581
 582         error = kstrtouint(buf, 0, &x);
 583         if (error)
 584                 return error;
 585
 586         if (check_zero && !x)
 587                 return -EINVAL;
 588
 589         spin_lock(&gt->gt_spin);
 590         *field = x;
 591         spin_unlock(&gt->gt_spin);
 592         return len;
 593 }
 594
 595 #define TUNE_ATTR_3(name, show, store)                                        \
 596 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 597
 598 #define TUNE_ATTR_2(name, store)                                              \
 599 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 600 {                                                                             \
 601         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 602 }                                                                             \
 603 TUNE_ATTR_3(name, name##_show, store)
 604
 605 #define TUNE_ATTR(name, check_zero)                                           \
 606 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 607 {                                                                             \
 608         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 609 }                                                                             \
 610 TUNE_ATTR_2(name, name##_store)
 611
 612 TUNE_ATTR(quota_warn_period, 0);
 613 TUNE_ATTR(quota_quantum, 0);
 614 TUNE_ATTR(max_readahead, 0);
 615 TUNE_ATTR(complain_secs, 0);
 616 TUNE_ATTR(statfs_slow, 0);
 617 TUNE_ATTR(new_files_jdata, 0);
 618 TUNE_ATTR(statfs_quantum, 1);
 619 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 620
 621 static struct attribute *tune_attrs[] = {
 622         &tune_attr_quota_warn_period.attr,
 623         &tune_attr_quota_quantum.attr,
 624         &tune_attr_max_readahead.attr,
 625         &tune_attr_complain_secs.attr,
 626         &tune_attr_statfs_slow.attr,
 627         &tune_attr_statfs_quantum.attr,
 628         &tune_attr_quota_scale.attr,
 629         &tune_attr_new_files_jdata.attr,
 630         NULL,
 631 };
 632
 633 static const struct attribute_group tune_group = {
 634         .name = "tune",
 635         .attrs = tune_attrs,
 636 };
 637
 638 static const struct attribute_group lock_module_group = {
 639         .name = "lock_module",
 640         .attrs = lock_module_attrs,
 641 };
 642
 643 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 644 {
 645         struct super_block *sb = sdp->sd_vfs;
 646         int error;
 647         char ro[20];
 648         char spectator[20];
 649         char *envp[] = { ro, spectator, NULL };
 650
 651         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
 652         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 653
 654         sdp->sd_kobj.kset = gfs2_kset;
 655         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 656                                      "%s", sdp->sd_table_name);
 657         if (error)
 658                 goto fail_reg;
 659
 660         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 661         if (error)
 662                 goto fail_reg;
 663
 664         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 665         if (error)
 666                 goto fail_tune;
 667
 668         error = sysfs_create_link(&sdp->sd_kobj,
 669                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 670                                   "device");
 671         if (error)
 672                 goto fail_lock_module;
 673
 674         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 675         return 0;
 676
 677 fail_lock_module:
 678         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 679 fail_tune:
 680         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 681 fail_reg:
 682         free_percpu(sdp->sd_lkstats);
 683         fs_err(sdp, "error %d adding sysfs files\n", error);
 684         kobject_put(&sdp->sd_kobj);
 685         sb->s_fs_info = NULL;
 686         return error;
 687 }
 688
 689 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 690 {
 691         sysfs_remove_link(&sdp->sd_kobj, "device");
 692         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 693         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 694         kobject_put(&sdp->sd_kobj);
 695 }
 696
 697 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 698                        struct kobj_uevent_env *env)
 699 {
 700         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 701         struct super_block *s = sdp->sd_vfs;
 702
 703         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 704         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 705         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 706                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 707         if (!uuid_is_null(&s->s_uuid))
 708                 add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
 709         return 0;
 710 }
 711
 712 static const struct kset_uevent_ops gfs2_uevent_ops = {
 713         .uevent = gfs2_uevent,
 714 };
 715
 716 int gfs2_sys_init(void)
 717 {
 718         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 719         if (!gfs2_kset)
 720                 return -ENOMEM;
 721         return 0;
 722 }
 723
 724 void gfs2_sys_uninit(void)
 725 {
 726         kset_unregister(gfs2_kset);
 727 }
 728