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