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/blkdev.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 status_show(struct gfs2_sbd *sdp, char *buf)
  67 {
  68         unsigned long f = sdp->sd_flags;
  69         ssize_t s;
  70
  71         s = snprintf(buf, PAGE_SIZE,
  72                      "Journal Checked:          %d\n"
  73                      "Journal Live:             %d\n"
  74                      "Journal ID:               %d\n"
  75                      "Spectator:                %d\n"
  76                      "Withdrawn:                %d\n"
  77                      "No barriers:              %d\n"
  78                      "No recovery:              %d\n"
  79                      "Demote:                   %d\n"
  80                      "No Journal ID:            %d\n"
  81                      "Mounted RO:               %d\n"
  82                      "RO Recovery:              %d\n"
  83                      "Skip DLM Unlock:          %d\n"
  84                      "Force AIL Flush:          %d\n"
  85                      "FS Freeze Initiator:      %d\n"
  86                      "FS Frozen:                %d\n"
  87                      "Withdrawing:              %d\n"
  88                      "Withdraw In Prog:         %d\n"
  89                      "Remote Withdraw:          %d\n"
  90                      "Withdraw Recovery:        %d\n"
  91                      "Deactivating:             %d\n"
  92                      "sd_log_error:             %d\n"
  93                      "sd_log_flush_lock:        %d\n"
  94                      "sd_log_num_revoke:        %u\n"
  95                      "sd_log_in_flight:         %d\n"
  96                      "sd_log_blks_needed:       %d\n"
  97                      "sd_log_blks_free:         %d\n"
  98                      "sd_log_flush_head:        %d\n"
  99                      "sd_log_flush_tail:        %d\n"
 100                      "sd_log_blks_reserved:     %d\n"
 101                      "sd_log_revokes_available: %d\n",
 102                      test_bit(SDF_JOURNAL_CHECKED, &f),
 103                      test_bit(SDF_JOURNAL_LIVE, &f),
 104                      (sdp->sd_jdesc ? sdp->sd_jdesc->jd_jid : 0),
 105                      (sdp->sd_args.ar_spectator ? 1 : 0),
 106                      test_bit(SDF_WITHDRAWN, &f),
 107                      test_bit(SDF_NOBARRIERS, &f),
 108                      test_bit(SDF_NORECOVERY, &f),
 109                      test_bit(SDF_DEMOTE, &f),
 110                      test_bit(SDF_NOJOURNALID, &f),
 111                      (sb_rdonly(sdp->sd_vfs) ? 1 : 0),
 112                      test_bit(SDF_RORECOVERY, &f),
 113                      test_bit(SDF_SKIP_DLM_UNLOCK, &f),
 114                      test_bit(SDF_FORCE_AIL_FLUSH, &f),
 115                      test_bit(SDF_FREEZE_INITIATOR, &f),
 116                      test_bit(SDF_FROZEN, &f),
 117                      test_bit(SDF_WITHDRAWING, &f),
 118                      test_bit(SDF_WITHDRAW_IN_PROG, &f),
 119                      test_bit(SDF_REMOTE_WITHDRAW, &f),
 120                      test_bit(SDF_WITHDRAW_RECOVERY, &f),
 121                      test_bit(SDF_DEACTIVATING, &f),
 122                      sdp->sd_log_error,
 123                      rwsem_is_locked(&sdp->sd_log_flush_lock),
 124                      sdp->sd_log_num_revoke,
 125                      atomic_read(&sdp->sd_log_in_flight),
 126                      atomic_read(&sdp->sd_log_blks_needed),
 127                      atomic_read(&sdp->sd_log_blks_free),
 128                      sdp->sd_log_flush_head,
 129                      sdp->sd_log_flush_tail,
 130                      sdp->sd_log_blks_reserved,
 131                      atomic_read(&sdp->sd_log_revokes_available));
 132         return s;
 133 }
 134
 135 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
 136 {
 137         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
 138 }
 139
 140 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
 141 {
 142         struct super_block *s = sdp->sd_vfs;
 143
 144         buf[0] = '\0';
 145         if (uuid_is_null(&s->s_uuid))
 146                 return 0;
 147         return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
 148 }
 149
 150 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
 151 {
 152         struct super_block *sb = sdp->sd_vfs;
 153         int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
 154
 155         return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
 156 }
 157
 158 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 159 {
 160         int error, n;
 161
 162         error = kstrtoint(buf, 0, &n);
 163         if (error)
 164                 return error;
 165
 166         if (!capable(CAP_SYS_ADMIN))
 167                 return -EPERM;
 168
 169         switch (n) {
 170         case 0:
 171                 error = thaw_super(sdp->sd_vfs);
 172                 break;
 173         case 1:
 174                 error = freeze_super(sdp->sd_vfs);
 175                 break;
 176         default:
 177                 return -EINVAL;
 178         }
 179
 180         if (error) {
 181                 fs_warn(sdp, "freeze %d error %d\n", n, error);
 182                 return error;
 183         }
 184
 185         return len;
 186 }
 187
 188 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 189 {
 190         unsigned int b = gfs2_withdrawn(sdp);
 191         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 192 }
 193
 194 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 195 {
 196         int error, val;
 197
 198         if (!capable(CAP_SYS_ADMIN))
 199                 return -EPERM;
 200
 201         error = kstrtoint(buf, 0, &val);
 202         if (error)
 203                 return error;
 204
 205         if (val != 1)
 206                 return -EINVAL;
 207
 208         gfs2_lm(sdp, "withdrawing from cluster at user's request\n");
 209         gfs2_withdraw(sdp);
 210
 211         return len;
 212 }
 213
 214 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 215                                  size_t len)
 216 {
 217         int error, val;
 218
 219         if (!capable(CAP_SYS_ADMIN))
 220                 return -EPERM;
 221
 222         error = kstrtoint(buf, 0, &val);
 223         if (error)
 224                 return error;
 225
 226         if (val != 1)
 227                 return -EINVAL;
 228
 229         gfs2_statfs_sync(sdp->sd_vfs, 0);
 230         return len;
 231 }
 232
 233 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 234                                 size_t len)
 235 {
 236         int error, val;
 237
 238         if (!capable(CAP_SYS_ADMIN))
 239                 return -EPERM;
 240
 241         error = kstrtoint(buf, 0, &val);
 242         if (error)
 243                 return error;
 244
 245         if (val != 1)
 246                 return -EINVAL;
 247
 248         gfs2_quota_sync(sdp->sd_vfs, 0);
 249         return len;
 250 }
 251
 252 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 253                                         size_t len)
 254 {
 255         struct kqid qid;
 256         int error;
 257         u32 id;
 258
 259         if (!capable(CAP_SYS_ADMIN))
 260                 return -EPERM;
 261
 262         error = kstrtou32(buf, 0, &id);
 263         if (error)
 264                 return error;
 265
 266         qid = make_kqid(current_user_ns(), USRQUOTA, id);
 267         if (!qid_valid(qid))
 268                 return -EINVAL;
 269
 270         error = gfs2_quota_refresh(sdp, qid);
 271         return error ? error : len;
 272 }
 273
 274 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 275                                          size_t len)
 276 {
 277         struct kqid qid;
 278         int error;
 279         u32 id;
 280
 281         if (!capable(CAP_SYS_ADMIN))
 282                 return -EPERM;
 283
 284         error = kstrtou32(buf, 0, &id);
 285         if (error)
 286                 return error;
 287
 288         qid = make_kqid(current_user_ns(), GRPQUOTA, id);
 289         if (!qid_valid(qid))
 290                 return -EINVAL;
 291
 292         error = gfs2_quota_refresh(sdp, qid);
 293         return error ? error : len;
 294 }
 295
 296 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 297 {
 298         struct gfs2_glock *gl;
 299         const struct gfs2_glock_operations *glops;
 300         unsigned int glmode;
 301         unsigned int gltype;
 302         unsigned long long glnum;
 303         char mode[16];
 304         int rv;
 305
 306         if (!capable(CAP_SYS_ADMIN))
 307                 return -EPERM;
 308
 309         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 310                     mode);
 311         if (rv != 3)
 312                 return -EINVAL;
 313
 314         if (strcmp(mode, "EX") == 0)
 315                 glmode = LM_ST_UNLOCKED;
 316         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 317                 glmode = LM_ST_DEFERRED;
 318         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 319                 glmode = LM_ST_SHARED;
 320         else
 321                 return -EINVAL;
 322
 323         if (gltype > LM_TYPE_JOURNAL)
 324                 return -EINVAL;
 325         if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
 326                 glops = &gfs2_freeze_glops;
 327         else
 328                 glops = gfs2_glops_list[gltype];
 329         if (glops == NULL)
 330                 return -EINVAL;
 331         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 332                 fs_info(sdp, "demote interface used\n");
 333         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 334         if (rv)
 335                 return rv;
 336         gfs2_glock_cb(gl, glmode);
 337         gfs2_glock_put(gl);
 338         return len;
 339 }
 340
 341
 342 #define GFS2_ATTR(name, mode, show, store) \
 343 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 344
 345 GFS2_ATTR(id,                  0444, id_show,       NULL);
 346 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 347 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 348 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 349 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 350 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 351 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 352 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 353 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 354 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 355 GFS2_ATTR(status,              0400, status_show,   NULL);
 356
 357 static struct attribute *gfs2_attrs[] = {
 358         &gfs2_attr_id.attr,
 359         &gfs2_attr_fsname.attr,
 360         &gfs2_attr_uuid.attr,
 361         &gfs2_attr_freeze.attr,
 362         &gfs2_attr_withdraw.attr,
 363         &gfs2_attr_statfs_sync.attr,
 364         &gfs2_attr_quota_sync.attr,
 365         &gfs2_attr_quota_refresh_user.attr,
 366         &gfs2_attr_quota_refresh_group.attr,
 367         &gfs2_attr_demote_rq.attr,
 368         &gfs2_attr_status.attr,
 369         NULL,
 370 };
 371 ATTRIBUTE_GROUPS(gfs2);
 372
 373 static void gfs2_sbd_release(struct kobject *kobj)
 374 {
 375         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 376
 377         complete(&sdp->sd_kobj_unregister);
 378 }
 379
 380 static struct kobj_type gfs2_ktype = {
 381         .release = gfs2_sbd_release,
 382         .default_groups = gfs2_groups,
 383         .sysfs_ops     = &gfs2_attr_ops,
 384 };
 385
 386
 387 /*
 388  * lock_module. Originally from lock_dlm
 389  */
 390
 391 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 392 {
 393         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 394         return sprintf(buf, "%s\n", ops->lm_proto_name);
 395 }
 396
 397 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 398 {
 399         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 400         ssize_t ret;
 401         int val = 0;
 402
 403         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
 404                 val = 1;
 405         ret = sprintf(buf, "%d\n", val);
 406         return ret;
 407 }
 408
 409 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 410 {
 411         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 412         int ret, val;
 413
 414         ret = kstrtoint(buf, 0, &val);
 415         if (ret)
 416                 return ret;
 417
 418         if (val == 1)
 419                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 420         else if (val == 0) {
 421                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 422                 smp_mb__after_atomic();
 423                 gfs2_glock_thaw(sdp);
 424         } else {
 425                 return -EINVAL;
 426         }
 427         return len;
 428 }
 429
 430 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
 431 {
 432         int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
 433
 434         return sprintf(buf, "%d\n", val);
 435 }
 436
 437 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 438 {
 439         int ret, val;
 440
 441         ret = kstrtoint(buf, 0, &val);
 442         if (ret)
 443                 return ret;
 444
 445         if ((val == 1) &&
 446             !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 447                 complete(&sdp->sd_wdack);
 448         else
 449                 return -EINVAL;
 450         return len;
 451 }
 452
 453 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 454 {
 455         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 456         return sprintf(buf, "%d\n", ls->ls_first);
 457 }
 458
 459 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 460 {
 461         unsigned first;
 462         int rv;
 463
 464         rv = sscanf(buf, "%u", &first);
 465         if (rv != 1 || first > 1)
 466                 return -EINVAL;
 467         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 468         if (rv)
 469                 return rv;
 470         spin_lock(&sdp->sd_jindex_spin);
 471         rv = -EBUSY;
 472         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 473                 goto out;
 474         rv = -EINVAL;
 475         if (sdp->sd_args.ar_spectator)
 476                 goto out;
 477         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 478                 goto out;
 479         sdp->sd_lockstruct.ls_first = first;
 480         rv = 0;
 481 out:
 482         spin_unlock(&sdp->sd_jindex_spin);
 483         return rv ? rv : len;
 484 }
 485
 486 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 487 {
 488         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 489         return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
 490 }
 491
 492 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
 493 {
 494         struct gfs2_jdesc *jd;
 495         int rv;
 496
 497         /* Wait for our primary journal to be initialized */
 498         wait_for_completion(&sdp->sd_journal_ready);
 499
 500         spin_lock(&sdp->sd_jindex_spin);
 501         rv = -EBUSY;
 502         /**
 503          * If we're a spectator, we use journal0, but it's not really ours.
 504          * So we need to wait for its recovery too. If we skip it we'd never
 505          * queue work to the recovery workqueue, and so its completion would
 506          * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
 507          * permanently stop working.
 508          */
 509         if (!sdp->sd_jdesc)
 510                 goto out;
 511         if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
 512                 goto out;
 513         rv = -ENOENT;
 514         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 515                 if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
 516                         continue;
 517                 rv = gfs2_recover_journal(jd, false);
 518                 break;
 519         }
 520 out:
 521         spin_unlock(&sdp->sd_jindex_spin);
 522         return rv;
 523 }
 524
 525 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 526 {
 527         unsigned jid;
 528         int rv;
 529
 530         rv = sscanf(buf, "%u", &jid);
 531         if (rv != 1)
 532                 return -EINVAL;
 533
 534         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 535                 rv = -ESHUTDOWN;
 536                 goto out;
 537         }
 538
 539         rv = gfs2_recover_set(sdp, jid);
 540 out:
 541         return rv ? rv : len;
 542 }
 543
 544 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 545 {
 546         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 547         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 548 }
 549
 550 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 551 {
 552         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 553         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 554 }
 555
 556 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 557 {
 558         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 559 }
 560
 561 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 562 {
 563         int jid;
 564         int rv;
 565
 566         rv = sscanf(buf, "%d", &jid);
 567         if (rv != 1)
 568                 return -EINVAL;
 569         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 570         if (rv)
 571                 return rv;
 572         spin_lock(&sdp->sd_jindex_spin);
 573         rv = -EINVAL;
 574         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 575                 goto out;
 576         rv = -EBUSY;
 577         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 578                 goto out;
 579         rv = 0;
 580         if (sdp->sd_args.ar_spectator && jid > 0)
 581                 rv = jid = -EINVAL;
 582         sdp->sd_lockstruct.ls_jid = jid;
 583         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 584         smp_mb__after_atomic();
 585         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 586 out:
 587         spin_unlock(&sdp->sd_jindex_spin);
 588         return rv ? rv : len;
 589 }
 590
 591 #define GDLM_ATTR(_name,_mode,_show,_store) \
 592 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 593
 594 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 595 GDLM_ATTR(block,                0644, block_show,               block_store);
 596 GDLM_ATTR(withdraw,             0644, wdack_show,               wdack_store);
 597 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 598 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 599 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 600 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 601 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 602 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 603
 604 static struct attribute *lock_module_attrs[] = {
 605         &gdlm_attr_proto_name.attr,
 606         &gdlm_attr_block.attr,
 607         &gdlm_attr_withdraw.attr,
 608         &gdlm_attr_jid.attr,
 609         &gdlm_attr_first.attr,
 610         &gdlm_attr_first_done.attr,
 611         &gdlm_attr_recover.attr,
 612         &gdlm_attr_recover_done.attr,
 613         &gdlm_attr_recover_status.attr,
 614         NULL,
 615 };
 616
 617 /*
 618  * get and set struct gfs2_tune fields
 619  */
 620
 621 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 622 {
 623         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 624                         sdp->sd_tune.gt_quota_scale_num,
 625                         sdp->sd_tune.gt_quota_scale_den);
 626 }
 627
 628 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 629                                  size_t len)
 630 {
 631         struct gfs2_tune *gt = &sdp->sd_tune;
 632         unsigned int x, y;
 633
 634         if (!capable(CAP_SYS_ADMIN))
 635                 return -EPERM;
 636
 637         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 638                 return -EINVAL;
 639
 640         spin_lock(&gt->gt_spin);
 641         gt->gt_quota_scale_num = x;
 642         gt->gt_quota_scale_den = y;
 643         spin_unlock(&gt->gt_spin);
 644         return len;
 645 }
 646
 647 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 648                         int check_zero, const char *buf, size_t len)
 649 {
 650         struct gfs2_tune *gt = &sdp->sd_tune;
 651         unsigned int x;
 652         int error;
 653
 654         if (!capable(CAP_SYS_ADMIN))
 655                 return -EPERM;
 656
 657         error = kstrtouint(buf, 0, &x);
 658         if (error)
 659                 return error;
 660
 661         if (check_zero && !x)
 662                 return -EINVAL;
 663
 664         spin_lock(&gt->gt_spin);
 665         *field = x;
 666         spin_unlock(&gt->gt_spin);
 667         return len;
 668 }
 669
 670 #define TUNE_ATTR_3(name, show, store)                                        \
 671 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 672
 673 #define TUNE_ATTR_2(name, store)                                              \
 674 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 675 {                                                                             \
 676         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 677 }                                                                             \
 678 TUNE_ATTR_3(name, name##_show, store)
 679
 680 #define TUNE_ATTR(name, check_zero)                                           \
 681 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 682 {                                                                             \
 683         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 684 }                                                                             \
 685 TUNE_ATTR_2(name, name##_store)
 686
 687 TUNE_ATTR(quota_warn_period, 0);
 688 TUNE_ATTR(quota_quantum, 0);
 689 TUNE_ATTR(max_readahead, 0);
 690 TUNE_ATTR(complain_secs, 0);
 691 TUNE_ATTR(statfs_slow, 0);
 692 TUNE_ATTR(new_files_jdata, 0);
 693 TUNE_ATTR(statfs_quantum, 1);
 694 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 695
 696 static struct attribute *tune_attrs[] = {
 697         &tune_attr_quota_warn_period.attr,
 698         &tune_attr_quota_quantum.attr,
 699         &tune_attr_max_readahead.attr,
 700         &tune_attr_complain_secs.attr,
 701         &tune_attr_statfs_slow.attr,
 702         &tune_attr_statfs_quantum.attr,
 703         &tune_attr_quota_scale.attr,
 704         &tune_attr_new_files_jdata.attr,
 705         NULL,
 706 };
 707
 708 static const struct attribute_group tune_group = {
 709         .name = "tune",
 710         .attrs = tune_attrs,
 711 };
 712
 713 static const struct attribute_group lock_module_group = {
 714         .name = "lock_module",
 715         .attrs = lock_module_attrs,
 716 };
 717
 718 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 719 {
 720         struct super_block *sb = sdp->sd_vfs;
 721         int error;
 722         char ro[20];
 723         char spectator[20];
 724         char *envp[] = { ro, spectator, NULL };
 725
 726         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
 727         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 728
 729         init_completion(&sdp->sd_kobj_unregister);
 730         sdp->sd_kobj.kset = gfs2_kset;
 731         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 732                                      "%s", sdp->sd_table_name);
 733         if (error)
 734                 goto fail_reg;
 735
 736         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 737         if (error)
 738                 goto fail_reg;
 739
 740         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 741         if (error)
 742                 goto fail_tune;
 743
 744         error = sysfs_create_link(&sdp->sd_kobj,
 745                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 746                                   "device");
 747         if (error)
 748                 goto fail_lock_module;
 749
 750         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 751         return 0;
 752
 753 fail_lock_module:
 754         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 755 fail_tune:
 756         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 757 fail_reg:
 758         fs_err(sdp, "error %d adding sysfs files\n", error);
 759         kobject_put(&sdp->sd_kobj);
 760         wait_for_completion(&sdp->sd_kobj_unregister);
 761         sb->s_fs_info = NULL;
 762         return error;
 763 }
 764
 765 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 766 {
 767         sysfs_remove_link(&sdp->sd_kobj, "device");
 768         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 769         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 770         kobject_put(&sdp->sd_kobj);
 771         wait_for_completion(&sdp->sd_kobj_unregister);
 772 }
 773
 774 static int gfs2_uevent(const struct kobject *kobj, struct kobj_uevent_env *env)
 775 {
 776         const struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 777         const struct super_block *s = sdp->sd_vfs;
 778
 779         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 780         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 781         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 782                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 783         if (!uuid_is_null(&s->s_uuid))
 784                 add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
 785         return 0;
 786 }
 787
 788 static const struct kset_uevent_ops gfs2_uevent_ops = {
 789         .uevent = gfs2_uevent,
 790 };
 791
 792 int gfs2_sys_init(void)
 793 {
 794         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 795         if (!gfs2_kset)
 796                 return -ENOMEM;
 797         return 0;
 798 }
 799
 800 void gfs2_sys_uninit(void)
 801 {
 802         kset_unregister(gfs2_kset);
 803 }
 804