fs/gfs2/sys.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/sched.h>
  10 #include <linux/cred.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/module.h>
  15 #include <linux/kobject.h>
  16 #include <linux/uaccess.h>
  17 #include <linux/gfs2_ondisk.h>
  18 #include <linux/genhd.h>
  19
  20 #include "gfs2.h"
  21 #include "incore.h"
  22 #include "sys.h"
  23 #include "super.h"
  24 #include "glock.h"
  25 #include "quota.h"
  26 #include "util.h"
  27 #include "glops.h"
  28 #include "recovery.h"
  29
  30 struct gfs2_attr {
  31         struct attribute attr;
  32         ssize_t (*show)(struct gfs2_sbd *, char *);
  33         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
  34 };
  35
  36 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
  37                               char *buf)
  38 {
  39         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
  40         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
  41         return a->show ? a->show(sdp, buf) : 0;
  42 }
  43
  44 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
  45                                const char *buf, size_t len)
  46 {
  47         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
  48         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
  49         return a->store ? a->store(sdp, buf, len) : len;
  50 }
  51
  52 static const struct sysfs_ops gfs2_attr_ops = {
  53         .show  = gfs2_attr_show,
  54         .store = gfs2_attr_store,
  55 };
  56
  57
  58 static struct kset *gfs2_kset;
  59
  60 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  61 {
  62         return snprintf(buf, PAGE_SIZE, "%u:%u\n",
  63                         MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
  64 }
  65
  66 static ssize_t 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                      "sd_log_error:             %d\n"
  91                      "sd_log_flush_lock:        %d\n"
  92                      "sd_log_num_revoke:        %u\n"
  93                      "sd_log_in_flight:         %d\n"
  94                      "sd_log_blks_needed:       %d\n"
  95                      "sd_log_blks_free:         %d\n"
  96                      "sd_log_flush_head:        %d\n"
  97                      "sd_log_flush_tail:        %d\n"
  98                      "sd_log_blks_reserved:     %d\n"
  99                      "sd_log_revokes_available: %d\n",
 100                      test_bit(SDF_JOURNAL_CHECKED, &f),
 101                      test_bit(SDF_JOURNAL_LIVE, &f),
 102                      (sdp->sd_jdesc ? sdp->sd_jdesc->jd_jid : 0),
 103                      (sdp->sd_args.ar_spectator ? 1 : 0),
 104                      test_bit(SDF_WITHDRAWN, &f),
 105                      test_bit(SDF_NOBARRIERS, &f),
 106                      test_bit(SDF_NORECOVERY, &f),
 107                      test_bit(SDF_DEMOTE, &f),
 108                      test_bit(SDF_NOJOURNALID, &f),
 109                      (sb_rdonly(sdp->sd_vfs) ? 1 : 0),
 110                      test_bit(SDF_RORECOVERY, &f),
 111                      test_bit(SDF_SKIP_DLM_UNLOCK, &f),
 112                      test_bit(SDF_FORCE_AIL_FLUSH, &f),
 113                      test_bit(SDF_FS_FROZEN, &f),
 114                      test_bit(SDF_WITHDRAWING, &f),
 115                      test_bit(SDF_WITHDRAW_IN_PROG, &f),
 116                      test_bit(SDF_REMOTE_WITHDRAW, &f),
 117                      test_bit(SDF_WITHDRAW_RECOVERY, &f),
 118                      sdp->sd_log_error,
 119                      rwsem_is_locked(&sdp->sd_log_flush_lock),
 120                      sdp->sd_log_num_revoke,
 121                      atomic_read(&sdp->sd_log_in_flight),
 122                      atomic_read(&sdp->sd_log_blks_needed),
 123                      atomic_read(&sdp->sd_log_blks_free),
 124                      sdp->sd_log_flush_head,
 125                      sdp->sd_log_flush_tail,
 126                      sdp->sd_log_blks_reserved,
 127                      atomic_read(&sdp->sd_log_revokes_available));
 128         return s;
 129 }
 130
 131 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
 132 {
 133         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
 134 }
 135
 136 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
 137 {
 138         struct super_block *s = sdp->sd_vfs;
 139
 140         buf[0] = '\0';
 141         if (uuid_is_null(&s->s_uuid))
 142                 return 0;
 143         return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
 144 }
 145
 146 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
 147 {
 148         struct super_block *sb = sdp->sd_vfs;
 149         int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
 150
 151         return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
 152 }
 153
 154 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 155 {
 156         int error, n;
 157
 158         error = kstrtoint(buf, 0, &n);
 159         if (error)
 160                 return error;
 161
 162         if (!capable(CAP_SYS_ADMIN))
 163                 return -EPERM;
 164
 165         switch (n) {
 166         case 0:
 167                 error = thaw_super(sdp->sd_vfs);
 168                 break;
 169         case 1:
 170                 error = freeze_super(sdp->sd_vfs);
 171                 break;
 172         default:
 173                 return -EINVAL;
 174         }
 175
 176         if (error) {
 177                 fs_warn(sdp, "freeze %d error %d\n", n, error);
 178                 return error;
 179         }
 180
 181         return len;
 182 }
 183
 184 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 185 {
 186         unsigned int b = gfs2_withdrawn(sdp);
 187         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 188 }
 189
 190 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 191 {
 192         int error, val;
 193
 194         if (!capable(CAP_SYS_ADMIN))
 195                 return -EPERM;
 196
 197         error = kstrtoint(buf, 0, &val);
 198         if (error)
 199                 return error;
 200
 201         if (val != 1)
 202                 return -EINVAL;
 203
 204         gfs2_lm(sdp, "withdrawing from cluster at user's request\n");
 205         gfs2_withdraw(sdp);
 206
 207         return len;
 208 }
 209
 210 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 211                                  size_t len)
 212 {
 213         int error, val;
 214
 215         if (!capable(CAP_SYS_ADMIN))
 216                 return -EPERM;
 217
 218         error = kstrtoint(buf, 0, &val);
 219         if (error)
 220                 return error;
 221
 222         if (val != 1)
 223                 return -EINVAL;
 224
 225         gfs2_statfs_sync(sdp->sd_vfs, 0);
 226         return len;
 227 }
 228
 229 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 230                                 size_t len)
 231 {
 232         int error, val;
 233
 234         if (!capable(CAP_SYS_ADMIN))
 235                 return -EPERM;
 236
 237         error = kstrtoint(buf, 0, &val);
 238         if (error)
 239                 return error;
 240
 241         if (val != 1)
 242                 return -EINVAL;
 243
 244         gfs2_quota_sync(sdp->sd_vfs, 0);
 245         return len;
 246 }
 247
 248 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 249                                         size_t len)
 250 {
 251         struct kqid qid;
 252         int error;
 253         u32 id;
 254
 255         if (!capable(CAP_SYS_ADMIN))
 256                 return -EPERM;
 257
 258         error = kstrtou32(buf, 0, &id);
 259         if (error)
 260                 return error;
 261
 262         qid = make_kqid(current_user_ns(), USRQUOTA, id);
 263         if (!qid_valid(qid))
 264                 return -EINVAL;
 265
 266         error = gfs2_quota_refresh(sdp, qid);
 267         return error ? error : len;
 268 }
 269
 270 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 271                                          size_t len)
 272 {
 273         struct kqid qid;
 274         int error;
 275         u32 id;
 276
 277         if (!capable(CAP_SYS_ADMIN))
 278                 return -EPERM;
 279
 280         error = kstrtou32(buf, 0, &id);
 281         if (error)
 282                 return error;
 283
 284         qid = make_kqid(current_user_ns(), GRPQUOTA, id);
 285         if (!qid_valid(qid))
 286                 return -EINVAL;
 287
 288         error = gfs2_quota_refresh(sdp, qid);
 289         return error ? error : len;
 290 }
 291
 292 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 293 {
 294         struct gfs2_glock *gl;
 295         const struct gfs2_glock_operations *glops;
 296         unsigned int glmode;
 297         unsigned int gltype;
 298         unsigned long long glnum;
 299         char mode[16];
 300         int rv;
 301
 302         if (!capable(CAP_SYS_ADMIN))
 303                 return -EPERM;
 304
 305         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 306                     mode);
 307         if (rv != 3)
 308                 return -EINVAL;
 309
 310         if (strcmp(mode, "EX") == 0)
 311                 glmode = LM_ST_UNLOCKED;
 312         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 313                 glmode = LM_ST_DEFERRED;
 314         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 315                 glmode = LM_ST_SHARED;
 316         else
 317                 return -EINVAL;
 318
 319         if (gltype > LM_TYPE_JOURNAL)
 320                 return -EINVAL;
 321         if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
 322                 glops = &gfs2_freeze_glops;
 323         else
 324                 glops = gfs2_glops_list[gltype];
 325         if (glops == NULL)
 326                 return -EINVAL;
 327         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 328                 fs_info(sdp, "demote interface used\n");
 329         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 330         if (rv)
 331                 return rv;
 332         gfs2_glock_cb(gl, glmode);
 333         gfs2_glock_put(gl);
 334         return len;
 335 }
 336
 337
 338 #define GFS2_ATTR(name, mode, show, store) \
 339 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 340
 341 GFS2_ATTR(id,                  0444, id_show,       NULL);
 342 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 343 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 344 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 345 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 346 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 347 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 348 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 349 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 350 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 351 GFS2_ATTR(status,              0400, status_show,   NULL);
 352
 353 static struct attribute *gfs2_attrs[] = {
 354         &gfs2_attr_id.attr,
 355         &gfs2_attr_fsname.attr,
 356         &gfs2_attr_uuid.attr,
 357         &gfs2_attr_freeze.attr,
 358         &gfs2_attr_withdraw.attr,
 359         &gfs2_attr_statfs_sync.attr,
 360         &gfs2_attr_quota_sync.attr,
 361         &gfs2_attr_quota_refresh_user.attr,
 362         &gfs2_attr_quota_refresh_group.attr,
 363         &gfs2_attr_demote_rq.attr,
 364         &gfs2_attr_status.attr,
 365         NULL,
 366 };
 367 ATTRIBUTE_GROUPS(gfs2);
 368
 369 static void gfs2_sbd_release(struct kobject *kobj)
 370 {
 371         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 372
 373         complete(&sdp->sd_kobj_unregister);
 374 }
 375
 376 static struct kobj_type gfs2_ktype = {
 377         .release = gfs2_sbd_release,
 378         .default_groups = gfs2_groups,
 379         .sysfs_ops     = &gfs2_attr_ops,
 380 };
 381
 382
 383 /*
 384  * lock_module. Originally from lock_dlm
 385  */
 386
 387 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 388 {
 389         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 390         return sprintf(buf, "%s\n", ops->lm_proto_name);
 391 }
 392
 393 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 394 {
 395         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 396         ssize_t ret;
 397         int val = 0;
 398
 399         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
 400                 val = 1;
 401         ret = sprintf(buf, "%d\n", val);
 402         return ret;
 403 }
 404
 405 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 406 {
 407         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 408         int ret, val;
 409
 410         ret = kstrtoint(buf, 0, &val);
 411         if (ret)
 412                 return ret;
 413
 414         if (val == 1)
 415                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 416         else if (val == 0) {
 417                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 418                 smp_mb__after_atomic();
 419                 gfs2_glock_thaw(sdp);
 420         } else {
 421                 return -EINVAL;
 422         }
 423         return len;
 424 }
 425
 426 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
 427 {
 428         int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
 429
 430         return sprintf(buf, "%d\n", val);
 431 }
 432
 433 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 434 {
 435         int ret, val;
 436
 437         ret = kstrtoint(buf, 0, &val);
 438         if (ret)
 439                 return ret;
 440
 441         if ((val == 1) &&
 442             !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
 443                 complete(&sdp->sd_wdack);
 444         else
 445                 return -EINVAL;
 446         return len;
 447 }
 448
 449 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 450 {
 451         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 452         return sprintf(buf, "%d\n", ls->ls_first);
 453 }
 454
 455 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 456 {
 457         unsigned first;
 458         int rv;
 459
 460         rv = sscanf(buf, "%u", &first);
 461         if (rv != 1 || first > 1)
 462                 return -EINVAL;
 463         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 464         if (rv)
 465                 return rv;
 466         spin_lock(&sdp->sd_jindex_spin);
 467         rv = -EBUSY;
 468         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 469                 goto out;
 470         rv = -EINVAL;
 471         if (sdp->sd_args.ar_spectator)
 472                 goto out;
 473         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 474                 goto out;
 475         sdp->sd_lockstruct.ls_first = first;
 476         rv = 0;
 477 out:
 478         spin_unlock(&sdp->sd_jindex_spin);
 479         return rv ? rv : len;
 480 }
 481
 482 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 483 {
 484         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 485         return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
 486 }
 487
 488 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
 489 {
 490         struct gfs2_jdesc *jd;
 491         int rv;
 492
 493         /* Wait for our primary journal to be initialized */
 494         wait_for_completion(&sdp->sd_journal_ready);
 495
 496         spin_lock(&sdp->sd_jindex_spin);
 497         rv = -EBUSY;
 498         /**
 499          * If we're a spectator, we use journal0, but it's not really ours.
 500          * So we need to wait for its recovery too. If we skip it we'd never
 501          * queue work to the recovery workqueue, and so its completion would
 502          * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
 503          * permanently stop working.
 504          */
 505         if (!sdp->sd_jdesc)
 506                 goto out;
 507         if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
 508                 goto out;
 509         rv = -ENOENT;
 510         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 511                 if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
 512                         continue;
 513                 rv = gfs2_recover_journal(jd, false);
 514                 break;
 515         }
 516 out:
 517         spin_unlock(&sdp->sd_jindex_spin);
 518         return rv;
 519 }
 520
 521 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 522 {
 523         unsigned jid;
 524         int rv;
 525
 526         rv = sscanf(buf, "%u", &jid);
 527         if (rv != 1)
 528                 return -EINVAL;
 529
 530         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 531                 rv = -ESHUTDOWN;
 532                 goto out;
 533         }
 534
 535         rv = gfs2_recover_set(sdp, jid);
 536 out:
 537         return rv ? rv : len;
 538 }
 539
 540 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 541 {
 542         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 543         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 544 }
 545
 546 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 547 {
 548         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 549         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 550 }
 551
 552 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 553 {
 554         return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 555 }
 556
 557 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 558 {
 559         int jid;
 560         int rv;
 561
 562         rv = sscanf(buf, "%d", &jid);
 563         if (rv != 1)
 564                 return -EINVAL;
 565         rv = wait_for_completion_killable(&sdp->sd_locking_init);
 566         if (rv)
 567                 return rv;
 568         spin_lock(&sdp->sd_jindex_spin);
 569         rv = -EINVAL;
 570         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 571                 goto out;
 572         rv = -EBUSY;
 573         if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 574                 goto out;
 575         rv = 0;
 576         if (sdp->sd_args.ar_spectator && jid > 0)
 577                 rv = jid = -EINVAL;
 578         sdp->sd_lockstruct.ls_jid = jid;
 579         clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 580         smp_mb__after_atomic();
 581         wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 582 out:
 583         spin_unlock(&sdp->sd_jindex_spin);
 584         return rv ? rv : len;
 585 }
 586
 587 #define GDLM_ATTR(_name,_mode,_show,_store) \
 588 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 589
 590 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 591 GDLM_ATTR(block,                0644, block_show,               block_store);
 592 GDLM_ATTR(withdraw,             0644, wdack_show,               wdack_store);
 593 GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 594 GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 595 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 596 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 597 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 598 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 599
 600 static struct attribute *lock_module_attrs[] = {
 601         &gdlm_attr_proto_name.attr,
 602         &gdlm_attr_block.attr,
 603         &gdlm_attr_withdraw.attr,
 604         &gdlm_attr_jid.attr,
 605         &gdlm_attr_first.attr,
 606         &gdlm_attr_first_done.attr,
 607         &gdlm_attr_recover.attr,
 608         &gdlm_attr_recover_done.attr,
 609         &gdlm_attr_recover_status.attr,
 610         NULL,
 611 };
 612
 613 /*
 614  * get and set struct gfs2_tune fields
 615  */
 616
 617 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 618 {
 619         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 620                         sdp->sd_tune.gt_quota_scale_num,
 621                         sdp->sd_tune.gt_quota_scale_den);
 622 }
 623
 624 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 625                                  size_t len)
 626 {
 627         struct gfs2_tune *gt = &sdp->sd_tune;
 628         unsigned int x, y;
 629
 630         if (!capable(CAP_SYS_ADMIN))
 631                 return -EPERM;
 632
 633         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 634                 return -EINVAL;
 635
 636         spin_lock(&gt->gt_spin);
 637         gt->gt_quota_scale_num = x;
 638         gt->gt_quota_scale_den = y;
 639         spin_unlock(&gt->gt_spin);
 640         return len;
 641 }
 642
 643 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 644                         int check_zero, const char *buf, size_t len)
 645 {
 646         struct gfs2_tune *gt = &sdp->sd_tune;
 647         unsigned int x;
 648         int error;
 649
 650         if (!capable(CAP_SYS_ADMIN))
 651                 return -EPERM;
 652
 653         error = kstrtouint(buf, 0, &x);
 654         if (error)
 655                 return error;
 656
 657         if (check_zero && !x)
 658                 return -EINVAL;
 659
 660         spin_lock(&gt->gt_spin);
 661         *field = x;
 662         spin_unlock(&gt->gt_spin);
 663         return len;
 664 }
 665
 666 #define TUNE_ATTR_3(name, show, store)                                        \
 667 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 668
 669 #define TUNE_ATTR_2(name, store)                                              \
 670 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 671 {                                                                             \
 672         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 673 }                                                                             \
 674 TUNE_ATTR_3(name, name##_show, store)
 675
 676 #define TUNE_ATTR(name, check_zero)                                           \
 677 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 678 {                                                                             \
 679         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 680 }                                                                             \
 681 TUNE_ATTR_2(name, name##_store)
 682
 683 TUNE_ATTR(quota_warn_period, 0);
 684 TUNE_ATTR(quota_quantum, 0);
 685 TUNE_ATTR(max_readahead, 0);
 686 TUNE_ATTR(complain_secs, 0);
 687 TUNE_ATTR(statfs_slow, 0);
 688 TUNE_ATTR(new_files_jdata, 0);
 689 TUNE_ATTR(statfs_quantum, 1);
 690 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 691
 692 static struct attribute *tune_attrs[] = {
 693         &tune_attr_quota_warn_period.attr,
 694         &tune_attr_quota_quantum.attr,
 695         &tune_attr_max_readahead.attr,
 696         &tune_attr_complain_secs.attr,
 697         &tune_attr_statfs_slow.attr,
 698         &tune_attr_statfs_quantum.attr,
 699         &tune_attr_quota_scale.attr,
 700         &tune_attr_new_files_jdata.attr,
 701         NULL,
 702 };
 703
 704 static const struct attribute_group tune_group = {
 705         .name = "tune",
 706         .attrs = tune_attrs,
 707 };
 708
 709 static const struct attribute_group lock_module_group = {
 710         .name = "lock_module",
 711         .attrs = lock_module_attrs,
 712 };
 713
 714 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 715 {
 716         struct super_block *sb = sdp->sd_vfs;
 717         int error;
 718         char ro[20];
 719         char spectator[20];
 720         char *envp[] = { ro, spectator, NULL };
 721
 722         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
 723         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 724
 725         init_completion(&sdp->sd_kobj_unregister);
 726         sdp->sd_kobj.kset = gfs2_kset;
 727         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 728                                      "%s", sdp->sd_table_name);
 729         if (error)
 730                 goto fail_reg;
 731
 732         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 733         if (error)
 734                 goto fail_reg;
 735
 736         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 737         if (error)
 738                 goto fail_tune;
 739
 740         error = sysfs_create_link(&sdp->sd_kobj,
 741                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 742                                   "device");
 743         if (error)
 744                 goto fail_lock_module;
 745
 746         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 747         return 0;
 748
 749 fail_lock_module:
 750         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 751 fail_tune:
 752         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 753 fail_reg:
 754         fs_err(sdp, "error %d adding sysfs files\n", error);
 755         kobject_put(&sdp->sd_kobj);
 756         wait_for_completion(&sdp->sd_kobj_unregister);
 757         sb->s_fs_info = NULL;
 758         return error;
 759 }
 760
 761 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 762 {
 763         sysfs_remove_link(&sdp->sd_kobj, "device");
 764         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 765         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 766         kobject_put(&sdp->sd_kobj);
 767         wait_for_completion(&sdp->sd_kobj_unregister);
 768 }
 769
 770 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 771                        struct kobj_uevent_env *env)
 772 {
 773         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 774         struct super_block *s = sdp->sd_vfs;
 775
 776         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 777         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 778         if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 779                 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 780         if (!uuid_is_null(&s->s_uuid))
 781                 add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
 782         return 0;
 783 }
 784
 785 static const struct kset_uevent_ops gfs2_uevent_ops = {
 786         .uevent = gfs2_uevent,
 787 };
 788
 789 int gfs2_sys_init(void)
 790 {
 791         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 792         if (!gfs2_kset)
 793                 return -ENOMEM;
 794         return 0;
 795 }
 796
 797 void gfs2_sys_uninit(void)
 798 {
 799         kset_unregister(gfs2_kset);
 800 }
 801