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                      "sd_log_pinned:            %d\n"
 103                      "sd_log_thresh1:           %d\n"
 104                      "sd_log_thresh2:           %d\n",
 105                      test_bit(SDF_JOURNAL_CHECKED, &f),
 106                      test_bit(SDF_JOURNAL_LIVE, &f),
 107                      (sdp->sd_jdesc ? sdp->sd_jdesc->jd_jid : 0),
 108                      (sdp->sd_args.ar_spectator ? 1 : 0),
 109                      test_bit(SDF_WITHDRAWN, &f),
 110                      test_bit(SDF_NOBARRIERS, &f),
 111                      test_bit(SDF_NORECOVERY, &f),
 112                      test_bit(SDF_DEMOTE, &f),
 113                      test_bit(SDF_NOJOURNALID, &f),
 114                      (sb_rdonly(sdp->sd_vfs) ? 1 : 0),
 115                      test_bit(SDF_RORECOVERY, &f),
 116                      test_bit(SDF_SKIP_DLM_UNLOCK, &f),
 117                      test_bit(SDF_FORCE_AIL_FLUSH, &f),
 118                      test_bit(SDF_FREEZE_INITIATOR, &f),
 119                      test_bit(SDF_FROZEN, &f),
 120                      test_bit(SDF_WITHDRAWING, &f),
 121                      test_bit(SDF_WITHDRAW_IN_PROG, &f),
 122                      test_bit(SDF_REMOTE_WITHDRAW, &f),
 123                      test_bit(SDF_WITHDRAW_RECOVERY, &f),
 124                      test_bit(SDF_KILL, &f),
 125                      sdp->sd_log_error,
 126                      rwsem_is_locked(&sdp->sd_log_flush_lock),
 127                      sdp->sd_log_num_revoke,
 128                      atomic_read(&sdp->sd_log_in_flight),
 129                      atomic_read(&sdp->sd_log_blks_needed),
 130                      atomic_read(&sdp->sd_log_blks_free),
 131                      sdp->sd_log_flush_head,
 132                      sdp->sd_log_flush_tail,
 133                      sdp->sd_log_blks_reserved,
 134                      atomic_read(&sdp->sd_log_revokes_available),
 135                      atomic_read(&sdp->sd_log_pinned),
 136                      atomic_read(&sdp->sd_log_thresh1),
 137                      atomic_read(&sdp->sd_log_thresh2));
 138         return s;
 139 }
 140
 141 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
 142 {
 143         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
 144 }
 145
 146 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
 147 {
 148         struct super_block *s = sdp->sd_vfs;
 149
 150         buf[0] = '\0';
 151         if (uuid_is_null(&s->s_uuid))
 152                 return 0;
 153         return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
 154 }
 155
 156 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
 157 {
 158         struct super_block *sb = sdp->sd_vfs;
 159         int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
 160
 161         return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
 162 }
 163
 164 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 165 {
 166         int error, n;
 167
 168         error = kstrtoint(buf, 0, &n);
 169         if (error)
 170                 return error;
 171
 172         if (!capable(CAP_SYS_ADMIN))
 173                 return -EPERM;
 174
 175         switch (n) {
 176         case 0:
 177                 error = thaw_super(sdp->sd_vfs, FREEZE_HOLDER_USERSPACE);
 178                 break;
 179         case 1:
 180                 error = freeze_super(sdp->sd_vfs, FREEZE_HOLDER_USERSPACE);
 181                 break;
 182         default:
 183                 return -EINVAL;
 184         }
 185
 186         if (error) {
 187                 fs_warn(sdp, "freeze %d error %d\n", n, error);
 188                 return error;
 189         }
 190
 191         return len;
 192 }
 193
 194 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 195 {
 196         unsigned int b = gfs2_withdrawn(sdp);
 197         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 198 }
 199
 200 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 201 {
 202         int error, val;
 203
 204         if (!capable(CAP_SYS_ADMIN))
 205                 return -EPERM;
 206
 207         error = kstrtoint(buf, 0, &val);
 208         if (error)
 209                 return error;
 210
 211         if (val != 1)
 212                 return -EINVAL;
 213
 214         gfs2_lm(sdp, "withdrawing from cluster at user's request\n");
 215         gfs2_withdraw(sdp);
 216
 217         return len;
 218 }
 219
 220 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 221                                  size_t len)
 222 {
 223         int error, val;
 224
 225         if (!capable(CAP_SYS_ADMIN))
 226                 return -EPERM;
 227
 228         error = kstrtoint(buf, 0, &val);
 229         if (error)
 230                 return error;
 231
 232         if (val != 1)
 233                 return -EINVAL;
 234
 235         gfs2_statfs_sync(sdp->sd_vfs, 0);
 236         return len;
 237 }
 238
 239 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 240                                 size_t len)
 241 {
 242         int error, val;
 243
 244         if (!capable(CAP_SYS_ADMIN))
 245                 return -EPERM;
 246
 247         error = kstrtoint(buf, 0, &val);
 248         if (error)
 249                 return error;
 250
 251         if (val != 1)
 252                 return -EINVAL;
 253
 254         gfs2_quota_sync(sdp->sd_vfs, 0);
 255         return len;
 256 }
 257
 258 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 259                                         size_t len)
 260 {
 261         struct kqid qid;
 262         int error;
 263         u32 id;
 264
 265         if (!capable(CAP_SYS_ADMIN))
 266                 return -EPERM;
 267
 268         error = kstrtou32(buf, 0, &id);
 269         if (error)
 270                 return error;
 271
 272         qid = make_kqid(current_user_ns(), USRQUOTA, id);
 273         if (!qid_valid(qid))
 274                 return -EINVAL;
 275
 276         error = gfs2_quota_refresh(sdp, qid);
 277         return error ? error : len;
 278 }
 279
 280 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 281                                          size_t len)
 282 {
 283         struct kqid qid;
 284         int error;
 285         u32 id;
 286
 287         if (!capable(CAP_SYS_ADMIN))
 288                 return -EPERM;
 289
 290         error = kstrtou32(buf, 0, &id);
 291         if (error)
 292                 return error;
 293
 294         qid = make_kqid(current_user_ns(), GRPQUOTA, id);
 295         if (!qid_valid(qid))
 296                 return -EINVAL;
 297
 298         error = gfs2_quota_refresh(sdp, qid);
 299         return error ? error : len;
 300 }
 301
 302 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 303 {
 304         struct gfs2_glock *gl;
 305         const struct gfs2_glock_operations *glops;
 306         unsigned int glmode;
 307         unsigned int gltype;
 308         unsigned long long glnum;
 309         char mode[16];
 310         int rv;
 311
 312         if (!capable(CAP_SYS_ADMIN))
 313                 return -EPERM;
 314
 315         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 316                     mode);
 317         if (rv != 3)
 318                 return -EINVAL;
 319
 320         if (strcmp(mode, "EX") == 0)
 321                 glmode = LM_ST_UNLOCKED;
 322         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 323                 glmode = LM_ST_DEFERRED;
 324         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 325                 glmode = LM_ST_SHARED;
 326         else
 327                 return -EINVAL;
 328
 329         if (gltype > LM_TYPE_JOURNAL)
 330                 return -EINVAL;
 331         if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
 332                 glops = &gfs2_freeze_glops;
 333         else
 334                 glops = gfs2_glops_list[gltype];
 335         if (glops == NULL)
 336                 return -EINVAL;
 337         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 338                 fs_info(sdp, "demote interface used\n");
 339         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 340         if (rv)
 341                 return rv;
 342         gfs2_glock_cb(gl, glmode);
 343         gfs2_glock_put(gl);
 344         return len;
 345 }
 346
 347
 348 #define GFS2_ATTR(name, mode, show, store) \
 349 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 350
 351 GFS2_ATTR(id,                  0444, id_show,       NULL);
 352 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 353 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 354 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 355 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 356 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 357 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 358 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 359 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 360 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 361 GFS2_ATTR(status,              0400, status_show,   NULL);
 362
 363 static struct attribute *gfs2_attrs[] = {
 364         &gfs2_attr_id.attr,
 365         &gfs2_attr_fsname.attr,
 366         &gfs2_attr_uuid.attr,
 367         &gfs2_attr_freeze.attr,
 368         &gfs2_attr_withdraw.attr,
 369         &gfs2_attr_statfs_sync.attr,
 370         &gfs2_attr_quota_sync.attr,
 371         &gfs2_attr_quota_refresh_user.attr,
 372         &gfs2_attr_quota_refresh_group.attr,
 373         &gfs2_attr_demote_rq.attr,
 374         &gfs2_attr_status.attr,
 375         NULL,
 376 };
 377 ATTRIBUTE_GROUPS(gfs2);
 378
 379 static void gfs2_sbd_release(struct kobject *kobj)
 380 {
 381         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 382
 383         complete(&sdp->sd_kobj_unregister);
 384 }
 385
 386 static struct kobj_type gfs2_ktype = {
 387         .release = gfs2_sbd_release,
 388         .default_groups = gfs2_groups,
 389         .sysfs_ops     = &gfs2_attr_ops,
 390 };
 391
 392
 393 /*
 394  * lock_module. Originally from lock_dlm
 395  */
 396
 397 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 398 {
 399         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 400         return sprintf(buf, "%s\n", ops->lm_proto_name);
 401 }
 402
 403 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 404 {
 405         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 406         ssize_t ret;
 407         int val = 0;
 408
 409         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
 410                 val = 1;
 411         ret = sprintf(buf, "%d\n", val);
 412         return ret;
 413 }
 414
 415 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 416 {
 417         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 418         int ret, val;
 419
 420         ret = kstrtoint(buf, 0, &val);
 421         if (ret)
 422                 return ret;
 423
 424         if (val == 1)
 425                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 426         else if (val == 0) {
 427                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 428                 smp_mb__after_atomic();
 429                 gfs2_glock_thaw(sdp);
 430         } else {
 431                 return -EINVAL;
 432         }
 433         return len;
 434 }
 435
 436 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
 437 {
 438         int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
 439
 440         return sprintf(buf, "%d\n", val);
 441 }
 442
 443 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 444 {
 445         int ret, val;
 446
 447         ret = kstrtoint(buf, 0, &val);
 448         if (ret)
 449                 return ret;
 450
 451         if ((val == 1) &&
 452             !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 453                 complete(&sdp->sd_wdack);
 454         else
 455                 return -EINVAL;
 456         return len;
 457 }
 458
 459 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 460 {
 461         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 462         return sprintf(buf, "%d\n", ls->ls_first);
 463 }
 464
 465 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 466 {
 467         unsigned first;
 468         int rv;
 469
 470         rv = sscanf(buf, "%u", &first);
 471         if (rv != 1 || first > 1)
 472                 return -EINVAL;
 473         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 474         if (rv)
 475                 return rv;
 476         spin_lock(&sdp->sd_jindex_spin);
 477         rv = -EBUSY;
 478         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 479                 goto out;
 480         rv = -EINVAL;
 481         if (sdp->sd_args.ar_spectator)
 482                 goto out;
 483         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 484                 goto out;
 485         sdp->sd_lockstruct.ls_first = first;
 486         rv = 0;
 487 out:
 488         spin_unlock(&sdp->sd_jindex_spin);
 489         return rv ? rv : len;
 490 }
 491
 492 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 493 {
 494         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 495         return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
 496 }
 497
 498 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
 499 {
 500         struct gfs2_jdesc *jd;
 501         int rv;
 502
 503         /* Wait for our primary journal to be initialized */
 504         wait_for_completion(&sdp->sd_journal_ready);
 505
 506         spin_lock(&sdp->sd_jindex_spin);
 507         rv = -EBUSY;
 508         /**
 509          * If we're a spectator, we use journal0, but it's not really ours.
 510          * So we need to wait for its recovery too. If we skip it we'd never
 511          * queue work to the recovery workqueue, and so its completion would
 512          * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
 513          * permanently stop working.
 514          */
 515         if (!sdp->sd_jdesc)
 516                 goto out;
 517         if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
 518                 goto out;
 519         rv = -ENOENT;
 520         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 521                 if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
 522                         continue;
 523                 rv = gfs2_recover_journal(jd, false);
 524                 break;
 525         }
 526 out:
 527         spin_unlock(&sdp->sd_jindex_spin);
 528         return rv;
 529 }
 530
 531 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 532 {
 533         unsigned jid;
 534         int rv;
 535
 536         rv = sscanf(buf, "%u", &jid);
 537         if (rv != 1)
 538                 return -EINVAL;
 539
 540         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 541                 rv = -ESHUTDOWN;
 542                 goto out;
 543         }
 544
 545         rv = gfs2_recover_set(sdp, jid);
 546 out:
 547         return rv ? rv : len;
 548 }
 549
 550 static ssize_t recover_done_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_done);
 554 }
 555
 556 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 557 {
 558         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 559         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 560 }
 561
 562 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 563 {
 564         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 565 }
 566
 567 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 568 {
 569         int jid;
 570         int rv;
 571
 572         rv = sscanf(buf, "%d", &jid);
 573         if (rv != 1)
 574                 return -EINVAL;
 575         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 576         if (rv)
 577                 return rv;
 578         spin_lock(&sdp->sd_jindex_spin);
 579         rv = -EINVAL;
 580         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 581                 goto out;
 582         rv = -EBUSY;
 583         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 584                 goto out;
 585         rv = 0;
 586         if (sdp->sd_args.ar_spectator && jid > 0)
 587                 rv = jid = -EINVAL;
 588         sdp->sd_lockstruct.ls_jid = jid;
 589         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 590         smp_mb__after_atomic();
 591         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 592 out:
 593         spin_unlock(&sdp->sd_jindex_spin);
 594         return rv ? rv : len;
 595 }
 596
 597 #define GDLM_ATTR(_name,_mode,_show,_store) \
 598 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 599
 600 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 601 GDLM_ATTR(block,                0644, block_show,               block_store);
 602 GDLM_ATTR(withdraw,             0644, wdack_show,               wdack_store);
 603 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 604 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 605 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 606 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 607 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 608 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 609
 610 static struct attribute *lock_module_attrs[] = {
 611         &gdlm_attr_proto_name.attr,
 612         &gdlm_attr_block.attr,
 613         &gdlm_attr_withdraw.attr,
 614         &gdlm_attr_jid.attr,
 615         &gdlm_attr_first.attr,
 616         &gdlm_attr_first_done.attr,
 617         &gdlm_attr_recover.attr,
 618         &gdlm_attr_recover_done.attr,
 619         &gdlm_attr_recover_status.attr,
 620         NULL,
 621 };
 622
 623 /*
 624  * get and set struct gfs2_tune fields
 625  */
 626
 627 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 628 {
 629         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 630                         sdp->sd_tune.gt_quota_scale_num,
 631                         sdp->sd_tune.gt_quota_scale_den);
 632 }
 633
 634 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 635                                  size_t len)
 636 {
 637         struct gfs2_tune *gt = &sdp->sd_tune;
 638         unsigned int x, y;
 639
 640         if (!capable(CAP_SYS_ADMIN))
 641                 return -EPERM;
 642
 643         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 644                 return -EINVAL;
 645
 646         spin_lock(&gt->gt_spin);
 647         gt->gt_quota_scale_num = x;
 648         gt->gt_quota_scale_den = y;
 649         spin_unlock(&gt->gt_spin);
 650         return len;
 651 }
 652
 653 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 654                         int check_zero, const char *buf, size_t len)
 655 {
 656         struct gfs2_tune *gt = &sdp->sd_tune;
 657         unsigned int x;
 658         int error;
 659
 660         if (!capable(CAP_SYS_ADMIN))
 661                 return -EPERM;
 662
 663         error = kstrtouint(buf, 0, &x);
 664         if (error)
 665                 return error;
 666
 667         if (check_zero && !x)
 668                 return -EINVAL;
 669
 670         spin_lock(&gt->gt_spin);
 671         *field = x;
 672         spin_unlock(&gt->gt_spin);
 673         return len;
 674 }
 675
 676 #define TUNE_ATTR_3(name, show, store)                                        \
 677 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 678
 679 #define TUNE_ATTR_2(name, store)                                              \
 680 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 681 {                                                                             \
 682         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 683 }                                                                             \
 684 TUNE_ATTR_3(name, name##_show, store)
 685
 686 #define TUNE_ATTR(name, check_zero)                                           \
 687 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 688 {                                                                             \
 689         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 690 }                                                                             \
 691 TUNE_ATTR_2(name, name##_store)
 692
 693 TUNE_ATTR(quota_warn_period, 0);
 694 TUNE_ATTR(quota_quantum, 0);
 695 TUNE_ATTR(max_readahead, 0);
 696 TUNE_ATTR(complain_secs, 0);
 697 TUNE_ATTR(statfs_slow, 0);
 698 TUNE_ATTR(new_files_jdata, 0);
 699 TUNE_ATTR(statfs_quantum, 1);
 700 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 701
 702 static struct attribute *tune_attrs[] = {
 703         &tune_attr_quota_warn_period.attr,
 704         &tune_attr_quota_quantum.attr,
 705         &tune_attr_max_readahead.attr,
 706         &tune_attr_complain_secs.attr,
 707         &tune_attr_statfs_slow.attr,
 708         &tune_attr_statfs_quantum.attr,
 709         &tune_attr_quota_scale.attr,
 710         &tune_attr_new_files_jdata.attr,
 711         NULL,
 712 };
 713
 714 static const struct attribute_group tune_group = {
 715         .name = "tune",
 716         .attrs = tune_attrs,
 717 };
 718
 719 static const struct attribute_group lock_module_group = {
 720         .name = "lock_module",
 721         .attrs = lock_module_attrs,
 722 };
 723
 724 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 725 {
 726         struct super_block *sb = sdp->sd_vfs;
 727         int error;
 728         char ro[20];
 729         char spectator[20];
 730         char *envp[] = { ro, spectator, NULL };
 731
 732         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
 733         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 734
 735         init_completion(&sdp->sd_kobj_unregister);
 736         sdp->sd_kobj.kset = gfs2_kset;
 737         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 738                                      "%s", sdp->sd_table_name);
 739         if (error)
 740                 goto fail_reg;
 741
 742         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 743         if (error)
 744                 goto fail_reg;
 745
 746         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 747         if (error)
 748                 goto fail_tune;
 749
 750         error = sysfs_create_link(&sdp->sd_kobj,
 751                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 752                                   "device");
 753         if (error)
 754                 goto fail_lock_module;
 755
 756         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 757         return 0;
 758
 759 fail_lock_module:
 760         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 761 fail_tune:
 762         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 763 fail_reg:
 764         fs_err(sdp, "error %d adding sysfs files\n", error);
 765         kobject_put(&sdp->sd_kobj);
 766         wait_for_completion(&sdp->sd_kobj_unregister);
 767         sb->s_fs_info = NULL;
 768         return error;
 769 }
 770
 771 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 772 {
 773         sysfs_remove_link(&sdp->sd_kobj, "device");
 774         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 775         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 776         kobject_put(&sdp->sd_kobj);
 777         wait_for_completion(&sdp->sd_kobj_unregister);
 778 }
 779
 780 static int gfs2_uevent(const struct kobject *kobj, struct kobj_uevent_env *env)
 781 {
 782         const struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 783         const struct super_block *s = sdp->sd_vfs;
 784
 785         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 786         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 787         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 788                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 789         if (!uuid_is_null(&s->s_uuid))
 790                 add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
 791         return 0;
 792 }
 793
 794 static const struct kset_uevent_ops gfs2_uevent_ops = {
 795         .uevent = gfs2_uevent,
 796 };
 797
 798 int gfs2_sys_init(void)
 799 {
 800         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 801         if (!gfs2_kset)
 802                 return -ENOMEM;
 803         return 0;
 804 }
 805
 806 void gfs2_sys_uninit(void)
 807 {
 808         kset_unregister(gfs2_kset);
 809 }
 810