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/cred.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/completion.h>
  16 #include <linux/buffer_head.h>
  17 #include <linux/module.h>
  18 #include <linux/kobject.h>
  19 #include <linux/uaccess.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/genhd.h>
  22
  23 #include "gfs2.h"
  24 #include "incore.h"
  25 #include "sys.h"
  26 #include "super.h"
  27 #include "glock.h"
  28 #include "quota.h"
  29 #include "util.h"
  30 #include "glops.h"
  31 #include "recovery.h"
  32
  33 struct gfs2_attr {
  34         struct attribute attr;
  35         ssize_t (*show)(struct gfs2_sbd *, char *);
  36         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
  37 };
  38
  39 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
  40                               char *buf)
  41 {
  42         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
  43         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
  44         return a->show ? a->show(sdp, buf) : 0;
  45 }
  46
  47 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
  48                                const char *buf, size_t len)
  49 {
  50         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
  51         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
  52         return a->store ? a->store(sdp, buf, len) : len;
  53 }
  54
  55 static const struct sysfs_ops gfs2_attr_ops = {
  56         .show  = gfs2_attr_show,
  57         .store = gfs2_attr_store,
  58 };
  59
  60
  61 static struct kset *gfs2_kset;
  62
  63 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  64 {
  65         return snprintf(buf, PAGE_SIZE, "%u:%u\n",
  66                         MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
  67 }
  68
  69 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  70 {
  71         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
  72 }
  73
  74 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
  75 {
  76         struct super_block *s = sdp->sd_vfs;
  77
  78         buf[0] = '\0';
  79         if (uuid_is_null(&s->s_uuid))
  80                 return 0;
  81         return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
  82 }
  83
  84 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  85 {
  86         struct super_block *sb = sdp->sd_vfs;
  87         int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
  88
  89         return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
  90 }
  91
  92 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  93 {
  94         int error, n;
  95
  96         error = kstrtoint(buf, 0, &n);
  97         if (error)
  98                 return error;
  99
 100         if (!capable(CAP_SYS_ADMIN))
 101                 return -EPERM;
 102
 103         switch (n) {
 104         case 0:
 105                 error = thaw_super(sdp->sd_vfs);
 106                 break;
 107         case 1:
 108                 error = freeze_super(sdp->sd_vfs);
 109                 break;
 110         default:
 111                 return -EINVAL;
 112         }
 113
 114         if (error) {
 115                 fs_warn(sdp, "freeze %d error %d", n, error);
 116                 return error;
 117         }
 118
 119         return len;
 120 }
 121
 122 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 123 {
 124         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
 125         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 126 }
 127
 128 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 129 {
 130         int error, val;
 131
 132         if (!capable(CAP_SYS_ADMIN))
 133                 return -EPERM;
 134
 135         error = kstrtoint(buf, 0, &val);
 136         if (error)
 137                 return error;
 138
 139         if (val != 1)
 140                 return -EINVAL;
 141
 142         gfs2_lm_withdraw(sdp, "withdrawing from cluster at user's request\n");
 143
 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         int error, val;
 151
 152         if (!capable(CAP_SYS_ADMIN))
 153                 return -EPERM;
 154
 155         error = kstrtoint(buf, 0, &val);
 156         if (error)
 157                 return error;
 158
 159         if (val != 1)
 160                 return -EINVAL;
 161
 162         gfs2_statfs_sync(sdp->sd_vfs, 0);
 163         return len;
 164 }
 165
 166 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 167                                 size_t len)
 168 {
 169         int error, val;
 170
 171         if (!capable(CAP_SYS_ADMIN))
 172                 return -EPERM;
 173
 174         error = kstrtoint(buf, 0, &val);
 175         if (error)
 176                 return error;
 177
 178         if (val != 1)
 179                 return -EINVAL;
 180
 181         gfs2_quota_sync(sdp->sd_vfs, 0);
 182         return len;
 183 }
 184
 185 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 186                                         size_t len)
 187 {
 188         struct kqid qid;
 189         int error;
 190         u32 id;
 191
 192         if (!capable(CAP_SYS_ADMIN))
 193                 return -EPERM;
 194
 195         error = kstrtou32(buf, 0, &id);
 196         if (error)
 197                 return error;
 198
 199         qid = make_kqid(current_user_ns(), USRQUOTA, id);
 200         if (!qid_valid(qid))
 201                 return -EINVAL;
 202
 203         error = gfs2_quota_refresh(sdp, qid);
 204         return error ? error : len;
 205 }
 206
 207 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 208                                          size_t len)
 209 {
 210         struct kqid qid;
 211         int error;
 212         u32 id;
 213
 214         if (!capable(CAP_SYS_ADMIN))
 215                 return -EPERM;
 216
 217         error = kstrtou32(buf, 0, &id);
 218         if (error)
 219                 return error;
 220
 221         qid = make_kqid(current_user_ns(), GRPQUOTA, id);
 222         if (!qid_valid(qid))
 223                 return -EINVAL;
 224
 225         error = gfs2_quota_refresh(sdp, qid);
 226         return error ? error : len;
 227 }
 228
 229 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 230 {
 231         struct gfs2_glock *gl;
 232         const struct gfs2_glock_operations *glops;
 233         unsigned int glmode;
 234         unsigned int gltype;
 235         unsigned long long glnum;
 236         char mode[16];
 237         int rv;
 238
 239         if (!capable(CAP_SYS_ADMIN))
 240                 return -EPERM;
 241
 242         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 243                     mode);
 244         if (rv != 3)
 245                 return -EINVAL;
 246
 247         if (strcmp(mode, "EX") == 0)
 248                 glmode = LM_ST_UNLOCKED;
 249         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 250                 glmode = LM_ST_DEFERRED;
 251         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 252                 glmode = LM_ST_SHARED;
 253         else
 254                 return -EINVAL;
 255
 256         if (gltype > LM_TYPE_JOURNAL)
 257                 return -EINVAL;
 258         if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
 259                 glops = &gfs2_freeze_glops;
 260         else
 261                 glops = gfs2_glops_list[gltype];
 262         if (glops == NULL)
 263                 return -EINVAL;
 264         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 265                 fs_info(sdp, "demote interface used\n");
 266         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 267         if (rv)
 268                 return rv;
 269         gfs2_glock_cb(gl, glmode);
 270         gfs2_glock_put(gl);
 271         return len;
 272 }
 273
 274
 275 #define GFS2_ATTR(name, mode, show, store) \
 276 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 277
 278 GFS2_ATTR(id,                  0444, id_show,       NULL);
 279 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 280 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 281 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 282 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 283 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 284 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 285 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 286 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 287 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 288
 289 static struct attribute *gfs2_attrs[] = {
 290         &gfs2_attr_id.attr,
 291         &gfs2_attr_fsname.attr,
 292         &gfs2_attr_uuid.attr,
 293         &gfs2_attr_freeze.attr,
 294         &gfs2_attr_withdraw.attr,
 295         &gfs2_attr_statfs_sync.attr,
 296         &gfs2_attr_quota_sync.attr,
 297         &gfs2_attr_quota_refresh_user.attr,
 298         &gfs2_attr_quota_refresh_group.attr,
 299         &gfs2_attr_demote_rq.attr,
 300         NULL,
 301 };
 302
 303 static void gfs2_sbd_release(struct kobject *kobj)
 304 {
 305         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 306
 307         kfree(sdp);
 308 }
 309
 310 static struct kobj_type gfs2_ktype = {
 311         .release = gfs2_sbd_release,
 312         .default_attrs = gfs2_attrs,
 313         .sysfs_ops     = &gfs2_attr_ops,
 314 };
 315
 316
 317 /*
 318  * lock_module. Originally from lock_dlm
 319  */
 320
 321 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 322 {
 323         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 324         return sprintf(buf, "%s\n", ops->lm_proto_name);
 325 }
 326
 327 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 328 {
 329         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 330         ssize_t ret;
 331         int val = 0;
 332
 333         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
 334                 val = 1;
 335         ret = sprintf(buf, "%d\n", val);
 336         return ret;
 337 }
 338
 339 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 340 {
 341         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 342         int ret, val;
 343
 344         ret = kstrtoint(buf, 0, &val);
 345         if (ret)
 346                 return ret;
 347
 348         if (val == 1)
 349                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 350         else if (val == 0) {
 351                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 352                 smp_mb__after_atomic();
 353                 gfs2_glock_thaw(sdp);
 354         } else {
 355                 return -EINVAL;
 356         }
 357         return len;
 358 }
 359
 360 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
 361 {
 362         int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
 363
 364         return sprintf(buf, "%d\n", val);
 365 }
 366
 367 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 368 {
 369         int ret, val;
 370
 371         ret = kstrtoint(buf, 0, &val);
 372         if (ret)
 373                 return ret;
 374
 375         if ((val == 1) &&
 376             !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 377                 complete(&sdp->sd_wdack);
 378         else
 379                 return -EINVAL;
 380         return len;
 381 }
 382
 383 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 384 {
 385         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 386         return sprintf(buf, "%d\n", ls->ls_first);
 387 }
 388
 389 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 390 {
 391         unsigned first;
 392         int rv;
 393
 394         rv = sscanf(buf, "%u", &first);
 395         if (rv != 1 || first > 1)
 396                 return -EINVAL;
 397         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 398         if (rv)
 399                 return rv;
 400         spin_lock(&sdp->sd_jindex_spin);
 401         rv = -EBUSY;
 402         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 403                 goto out;
 404         rv = -EINVAL;
 405         if (sdp->sd_args.ar_spectator)
 406                 goto out;
 407         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 408                 goto out;
 409         sdp->sd_lockstruct.ls_first = first;
 410         rv = 0;
 411 out:
 412         spin_unlock(&sdp->sd_jindex_spin);
 413         return rv ? rv : len;
 414 }
 415
 416 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 417 {
 418         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 419         return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
 420 }
 421
 422 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
 423 {
 424         struct gfs2_jdesc *jd;
 425         int rv;
 426
 427         /* Wait for our primary journal to be initialized */
 428         wait_for_completion(&sdp->sd_journal_ready);
 429
 430         spin_lock(&sdp->sd_jindex_spin);
 431         rv = -EBUSY;
 432         if (sdp->sd_jdesc->jd_jid == jid)
 433                 goto out;
 434         rv = -ENOENT;
 435         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 436                 if (jd->jd_jid != jid)
 437                         continue;
 438                 rv = gfs2_recover_journal(jd, false);
 439                 break;
 440         }
 441 out:
 442         spin_unlock(&sdp->sd_jindex_spin);
 443         return rv;
 444 }
 445
 446 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 447 {
 448         unsigned jid;
 449         int rv;
 450
 451         rv = sscanf(buf, "%u", &jid);
 452         if (rv != 1)
 453                 return -EINVAL;
 454
 455         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 456                 rv = -ESHUTDOWN;
 457                 goto out;
 458         }
 459
 460         rv = gfs2_recover_set(sdp, jid);
 461 out:
 462         return rv ? rv : len;
 463 }
 464
 465 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 466 {
 467         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 468         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 469 }
 470
 471 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 472 {
 473         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 474         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 475 }
 476
 477 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 478 {
 479         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 480 }
 481
 482 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 483 {
 484         int jid;
 485         int rv;
 486
 487         rv = sscanf(buf, "%d", &jid);
 488         if (rv != 1)
 489                 return -EINVAL;
 490         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 491         if (rv)
 492                 return rv;
 493         spin_lock(&sdp->sd_jindex_spin);
 494         rv = -EINVAL;
 495         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 496                 goto out;
 497         rv = -EBUSY;
 498         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 499                 goto out;
 500         rv = 0;
 501         if (sdp->sd_args.ar_spectator && jid > 0)
 502                 rv = jid = -EINVAL;
 503         sdp->sd_lockstruct.ls_jid = jid;
 504         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 505         smp_mb__after_atomic();
 506         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 507 out:
 508         spin_unlock(&sdp->sd_jindex_spin);
 509         return rv ? rv : len;
 510 }
 511
 512 #define GDLM_ATTR(_name,_mode,_show,_store) \
 513 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 514
 515 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 516 GDLM_ATTR(block,                0644, block_show,               block_store);
 517 GDLM_ATTR(withdraw,             0644, wdack_show,               wdack_store);
 518 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 519 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 520 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 521 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 522 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 523 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 524
 525 static struct attribute *lock_module_attrs[] = {
 526         &gdlm_attr_proto_name.attr,
 527         &gdlm_attr_block.attr,
 528         &gdlm_attr_withdraw.attr,
 529         &gdlm_attr_jid.attr,
 530         &gdlm_attr_first.attr,
 531         &gdlm_attr_first_done.attr,
 532         &gdlm_attr_recover.attr,
 533         &gdlm_attr_recover_done.attr,
 534         &gdlm_attr_recover_status.attr,
 535         NULL,
 536 };
 537
 538 /*
 539  * get and set struct gfs2_tune fields
 540  */
 541
 542 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 543 {
 544         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 545                         sdp->sd_tune.gt_quota_scale_num,
 546                         sdp->sd_tune.gt_quota_scale_den);
 547 }
 548
 549 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 550                                  size_t len)
 551 {
 552         struct gfs2_tune *gt = &sdp->sd_tune;
 553         unsigned int x, y;
 554
 555         if (!capable(CAP_SYS_ADMIN))
 556                 return -EPERM;
 557
 558         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 559                 return -EINVAL;
 560
 561         spin_lock(&gt->gt_spin);
 562         gt->gt_quota_scale_num = x;
 563         gt->gt_quota_scale_den = y;
 564         spin_unlock(&gt->gt_spin);
 565         return len;
 566 }
 567
 568 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 569                         int check_zero, const char *buf, size_t len)
 570 {
 571         struct gfs2_tune *gt = &sdp->sd_tune;
 572         unsigned int x;
 573         int error;
 574
 575         if (!capable(CAP_SYS_ADMIN))
 576                 return -EPERM;
 577
 578         error = kstrtouint(buf, 0, &x);
 579         if (error)
 580                 return error;
 581
 582         if (check_zero && !x)
 583                 return -EINVAL;
 584
 585         spin_lock(&gt->gt_spin);
 586         *field = x;
 587         spin_unlock(&gt->gt_spin);
 588         return len;
 589 }
 590
 591 #define TUNE_ATTR_3(name, show, store)                                        \
 592 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 593
 594 #define TUNE_ATTR_2(name, store)                                              \
 595 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 596 {                                                                             \
 597         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 598 }                                                                             \
 599 TUNE_ATTR_3(name, name##_show, store)
 600
 601 #define TUNE_ATTR(name, check_zero)                                           \
 602 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 603 {                                                                             \
 604         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 605 }                                                                             \
 606 TUNE_ATTR_2(name, name##_store)
 607
 608 TUNE_ATTR(quota_warn_period, 0);
 609 TUNE_ATTR(quota_quantum, 0);
 610 TUNE_ATTR(max_readahead, 0);
 611 TUNE_ATTR(complain_secs, 0);
 612 TUNE_ATTR(statfs_slow, 0);
 613 TUNE_ATTR(new_files_jdata, 0);
 614 TUNE_ATTR(statfs_quantum, 1);
 615 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 616
 617 static struct attribute *tune_attrs[] = {
 618         &tune_attr_quota_warn_period.attr,
 619         &tune_attr_quota_quantum.attr,
 620         &tune_attr_max_readahead.attr,
 621         &tune_attr_complain_secs.attr,
 622         &tune_attr_statfs_slow.attr,
 623         &tune_attr_statfs_quantum.attr,
 624         &tune_attr_quota_scale.attr,
 625         &tune_attr_new_files_jdata.attr,
 626         NULL,
 627 };
 628
 629 static const struct attribute_group tune_group = {
 630         .name = "tune",
 631         .attrs = tune_attrs,
 632 };
 633
 634 static const struct attribute_group lock_module_group = {
 635         .name = "lock_module",
 636         .attrs = lock_module_attrs,
 637 };
 638
 639 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 640 {
 641         struct super_block *sb = sdp->sd_vfs;
 642         int error;
 643         char ro[20];
 644         char spectator[20];
 645         char *envp[] = { ro, spectator, NULL };
 646         int sysfs_frees_sdp = 0;
 647
 648         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
 649         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 650
 651         sdp->sd_kobj.kset = gfs2_kset;
 652         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 653                                      "%s", sdp->sd_table_name);
 654         if (error)
 655                 goto fail_reg;
 656
 657         sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
 658                                 function gfs2_sbd_release. */
 659         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 660         if (error)
 661                 goto fail_reg;
 662
 663         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 664         if (error)
 665                 goto fail_tune;
 666
 667         error = sysfs_create_link(&sdp->sd_kobj,
 668                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 669                                   "device");
 670         if (error)
 671                 goto fail_lock_module;
 672
 673         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 674         return 0;
 675
 676 fail_lock_module:
 677         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 678 fail_tune:
 679         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 680 fail_reg:
 681         free_percpu(sdp->sd_lkstats);
 682         fs_err(sdp, "error %d adding sysfs files", error);
 683         if (sysfs_frees_sdp)
 684                 kobject_put(&sdp->sd_kobj);
 685         else
 686                 kfree(sdp);
 687         sb->s_fs_info = NULL;
 688         return error;
 689 }
 690
 691 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 692 {
 693         sysfs_remove_link(&sdp->sd_kobj, "device");
 694         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 695         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 696         kobject_put(&sdp->sd_kobj);
 697 }
 698
 699 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 700                        struct kobj_uevent_env *env)
 701 {
 702         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 703         struct super_block *s = sdp->sd_vfs;
 704
 705         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 706         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 707         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 708                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 709         if (!uuid_is_null(&s->s_uuid))
 710                 add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
 711         return 0;
 712 }
 713
 714 static const struct kset_uevent_ops gfs2_uevent_ops = {
 715         .uevent = gfs2_uevent,
 716 };
 717
 718 int gfs2_sys_init(void)
 719 {
 720         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 721         if (!gfs2_kset)
 722                 return -ENOMEM;
 723         return 0;
 724 }
 725
 726 void gfs2_sys_uninit(void)
 727 {
 728         kset_unregister(gfs2_kset);
 729 }
 730