linux/fs/gfs2/sys.c
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   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#include <linux/sched.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 <asm/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
  30struct 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
  36static 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
  44static 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
  52static const struct sysfs_ops gfs2_attr_ops = {
  53        .show  = gfs2_attr_show,
  54        .store = gfs2_attr_store,
  55};
  56
  57
  58static struct kset *gfs2_kset;
  59
  60static 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
  66static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  67{
  68        return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
  69}
  70
  71static int gfs2_uuid_valid(const u8 *uuid)
  72{
  73        int i;
  74
  75        for (i = 0; i < 16; i++) {
  76                if (uuid[i])
  77                        return 1;
  78        }
  79        return 0;
  80}
  81
  82static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
  83{
  84        struct super_block *s = sdp->sd_vfs;
  85        const u8 *uuid = s->s_uuid;
  86        buf[0] = '\0';
  87        if (!gfs2_uuid_valid(uuid))
  88                return 0;
  89        return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
  90}
  91
  92static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  93{
  94        unsigned int count;
  95
  96        mutex_lock(&sdp->sd_freeze_lock);
  97        count = sdp->sd_freeze_count;
  98        mutex_unlock(&sdp->sd_freeze_lock);
  99
 100        return snprintf(buf, PAGE_SIZE, "%u\n", count);
 101}
 102
 103static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 104{
 105        ssize_t ret = len;
 106        int error = 0;
 107        int n = simple_strtol(buf, NULL, 0);
 108
 109        if (!capable(CAP_SYS_ADMIN))
 110                return -EACCES;
 111
 112        switch (n) {
 113        case 0:
 114                gfs2_unfreeze_fs(sdp);
 115                break;
 116        case 1:
 117                error = gfs2_freeze_fs(sdp);
 118                break;
 119        default:
 120                ret = -EINVAL;
 121        }
 122
 123        if (error)
 124                fs_warn(sdp, "freeze %d error %d", n, error);
 125
 126        return ret;
 127}
 128
 129static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 130{
 131        unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
 132        return snprintf(buf, PAGE_SIZE, "%u\n", b);
 133}
 134
 135static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 136{
 137        if (!capable(CAP_SYS_ADMIN))
 138                return -EACCES;
 139
 140        if (simple_strtol(buf, NULL, 0) != 1)
 141                return -EINVAL;
 142
 143        gfs2_lm_withdraw(sdp,
 144                "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
 145                sdp->sd_fsname);
 146        return len;
 147}
 148
 149static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 150                                 size_t len)
 151{
 152        if (!capable(CAP_SYS_ADMIN))
 153                return -EACCES;
 154
 155        if (simple_strtol(buf, NULL, 0) != 1)
 156                return -EINVAL;
 157
 158        gfs2_statfs_sync(sdp->sd_vfs, 0);
 159        return len;
 160}
 161
 162static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 163                                size_t len)
 164{
 165        if (!capable(CAP_SYS_ADMIN))
 166                return -EACCES;
 167
 168        if (simple_strtol(buf, NULL, 0) != 1)
 169                return -EINVAL;
 170
 171        gfs2_quota_sync(sdp->sd_vfs, 0);
 172        return len;
 173}
 174
 175static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 176                                        size_t len)
 177{
 178        int error;
 179        u32 id;
 180
 181        if (!capable(CAP_SYS_ADMIN))
 182                return -EACCES;
 183
 184        id = simple_strtoul(buf, NULL, 0);
 185
 186        error = gfs2_quota_refresh(sdp, 1, id);
 187        return error ? error : len;
 188}
 189
 190static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 191                                         size_t len)
 192{
 193        int error;
 194        u32 id;
 195
 196        if (!capable(CAP_SYS_ADMIN))
 197                return -EACCES;
 198
 199        id = simple_strtoul(buf, NULL, 0);
 200
 201        error = gfs2_quota_refresh(sdp, 0, id);
 202        return error ? error : len;
 203}
 204
 205static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 206{
 207        struct gfs2_glock *gl;
 208        const struct gfs2_glock_operations *glops;
 209        unsigned int glmode;
 210        unsigned int gltype;
 211        unsigned long long glnum;
 212        char mode[16];
 213        int rv;
 214
 215        if (!capable(CAP_SYS_ADMIN))
 216                return -EACCES;
 217
 218        rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 219                    mode);
 220        if (rv != 3)
 221                return -EINVAL;
 222
 223        if (strcmp(mode, "EX") == 0)
 224                glmode = LM_ST_UNLOCKED;
 225        else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 226                glmode = LM_ST_DEFERRED;
 227        else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 228                glmode = LM_ST_SHARED;
 229        else
 230                return -EINVAL;
 231
 232        if (gltype > LM_TYPE_JOURNAL)
 233                return -EINVAL;
 234        if (gltype == LM_TYPE_NONDISK && glnum == GFS2_TRANS_LOCK)
 235                glops = &gfs2_trans_glops;
 236        else
 237                glops = gfs2_glops_list[gltype];
 238        if (glops == NULL)
 239                return -EINVAL;
 240        if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 241                fs_info(sdp, "demote interface used\n");
 242        rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 243        if (rv)
 244                return rv;
 245        gfs2_glock_cb(gl, glmode);
 246        gfs2_glock_put(gl);
 247        return len;
 248}
 249
 250
 251#define GFS2_ATTR(name, mode, show, store) \
 252static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 253
 254GFS2_ATTR(id,                  0444, id_show,       NULL);
 255GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 256GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 257GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 258GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 259GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 260GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 261GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 262GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 263GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 264
 265static struct attribute *gfs2_attrs[] = {
 266        &gfs2_attr_id.attr,
 267        &gfs2_attr_fsname.attr,
 268        &gfs2_attr_uuid.attr,
 269        &gfs2_attr_freeze.attr,
 270        &gfs2_attr_withdraw.attr,
 271        &gfs2_attr_statfs_sync.attr,
 272        &gfs2_attr_quota_sync.attr,
 273        &gfs2_attr_quota_refresh_user.attr,
 274        &gfs2_attr_quota_refresh_group.attr,
 275        &gfs2_attr_demote_rq.attr,
 276        NULL,
 277};
 278
 279static void gfs2_sbd_release(struct kobject *kobj)
 280{
 281        struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 282
 283        kfree(sdp);
 284}
 285
 286static struct kobj_type gfs2_ktype = {
 287        .release = gfs2_sbd_release,
 288        .default_attrs = gfs2_attrs,
 289        .sysfs_ops     = &gfs2_attr_ops,
 290};
 291
 292
 293/*
 294 * lock_module. Originally from lock_dlm
 295 */
 296
 297static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 298{
 299        const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 300        return sprintf(buf, "%s\n", ops->lm_proto_name);
 301}
 302
 303static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 304{
 305        struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 306        ssize_t ret;
 307        int val = 0;
 308
 309        if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
 310                val = 1;
 311        ret = sprintf(buf, "%d\n", val);
 312        return ret;
 313}
 314
 315static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 316{
 317        struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 318        ssize_t ret = len;
 319        int val;
 320
 321        val = simple_strtol(buf, NULL, 0);
 322
 323        if (val == 1)
 324                set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 325        else if (val == 0) {
 326                clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
 327                smp_mb__after_clear_bit();
 328                gfs2_glock_thaw(sdp);
 329        } else {
 330                ret = -EINVAL;
 331        }
 332        return ret;
 333}
 334
 335static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 336{
 337        struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 338        return sprintf(buf, "%d\n", ls->ls_first);
 339}
 340
 341static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 342{
 343        unsigned first;
 344        int rv;
 345
 346        rv = sscanf(buf, "%u", &first);
 347        if (rv != 1 || first > 1)
 348                return -EINVAL;
 349        rv = wait_for_completion_killable(&sdp->sd_locking_init);
 350        if (rv)
 351                return rv;
 352        spin_lock(&sdp->sd_jindex_spin);
 353        rv = -EBUSY;
 354        if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 355                goto out;
 356        rv = -EINVAL;
 357        if (sdp->sd_args.ar_spectator)
 358                goto out;
 359        if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 360                goto out;
 361        sdp->sd_lockstruct.ls_first = first;
 362        rv = 0;
 363out:
 364        spin_unlock(&sdp->sd_jindex_spin);
 365        return rv ? rv : len;
 366}
 367
 368static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 369{
 370        struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 371        return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
 372}
 373
 374int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
 375{
 376        struct gfs2_jdesc *jd;
 377        int rv;
 378
 379        spin_lock(&sdp->sd_jindex_spin);
 380        rv = -EBUSY;
 381        if (sdp->sd_jdesc->jd_jid == jid)
 382                goto out;
 383        rv = -ENOENT;
 384        list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 385                if (jd->jd_jid != jid)
 386                        continue;
 387                rv = gfs2_recover_journal(jd, false);
 388                break;
 389        }
 390out:
 391        spin_unlock(&sdp->sd_jindex_spin);
 392        return rv;
 393}
 394
 395static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 396{
 397        unsigned jid;
 398        int rv;
 399
 400        rv = sscanf(buf, "%u", &jid);
 401        if (rv != 1)
 402                return -EINVAL;
 403
 404        if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
 405                rv = -ESHUTDOWN;
 406                goto out;
 407        }
 408
 409        rv = gfs2_recover_set(sdp, jid);
 410out:
 411        return rv ? rv : len;
 412}
 413
 414static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 415{
 416        struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 417        return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 418}
 419
 420static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 421{
 422        struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 423        return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 424}
 425
 426static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 427{
 428        return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
 429}
 430
 431static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 432{
 433        int jid;
 434        int rv;
 435
 436        rv = sscanf(buf, "%d", &jid);
 437        if (rv != 1)
 438                return -EINVAL;
 439        rv = wait_for_completion_killable(&sdp->sd_locking_init);
 440        if (rv)
 441                return rv;
 442        spin_lock(&sdp->sd_jindex_spin);
 443        rv = -EINVAL;
 444        if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 445                goto out;
 446        rv = -EBUSY;
 447        if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
 448                goto out;
 449        rv = 0;
 450        if (sdp->sd_args.ar_spectator && jid > 0)
 451                rv = jid = -EINVAL;
 452        sdp->sd_lockstruct.ls_jid = jid;
 453        clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 454        smp_mb__after_clear_bit();
 455        wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
 456out:
 457        spin_unlock(&sdp->sd_jindex_spin);
 458        return rv ? rv : len;
 459}
 460
 461#define GDLM_ATTR(_name,_mode,_show,_store) \
 462static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 463
 464GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 465GDLM_ATTR(block,                0644, block_show,               block_store);
 466GDLM_ATTR(withdraw,             0644, withdraw_show,            withdraw_store);
 467GDLM_ATTR(jid,                  0644, jid_show,                 jid_store);
 468GDLM_ATTR(first,                0644, lkfirst_show,             lkfirst_store);
 469GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 470GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 471GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 472GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 473
 474static struct attribute *lock_module_attrs[] = {
 475        &gdlm_attr_proto_name.attr,
 476        &gdlm_attr_block.attr,
 477        &gdlm_attr_withdraw.attr,
 478        &gdlm_attr_jid.attr,
 479        &gdlm_attr_first.attr,
 480        &gdlm_attr_first_done.attr,
 481        &gdlm_attr_recover.attr,
 482        &gdlm_attr_recover_done.attr,
 483        &gdlm_attr_recover_status.attr,
 484        NULL,
 485};
 486
 487/*
 488 * get and set struct gfs2_tune fields
 489 */
 490
 491static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 492{
 493        return snprintf(buf, PAGE_SIZE, "%u %u\n",
 494                        sdp->sd_tune.gt_quota_scale_num,
 495                        sdp->sd_tune.gt_quota_scale_den);
 496}
 497
 498static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 499                                 size_t len)
 500{
 501        struct gfs2_tune *gt = &sdp->sd_tune;
 502        unsigned int x, y;
 503
 504        if (!capable(CAP_SYS_ADMIN))
 505                return -EACCES;
 506
 507        if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 508                return -EINVAL;
 509
 510        spin_lock(&gt->gt_spin);
 511        gt->gt_quota_scale_num = x;
 512        gt->gt_quota_scale_den = y;
 513        spin_unlock(&gt->gt_spin);
 514        return len;
 515}
 516
 517static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 518                        int check_zero, const char *buf, size_t len)
 519{
 520        struct gfs2_tune *gt = &sdp->sd_tune;
 521        unsigned int x;
 522
 523        if (!capable(CAP_SYS_ADMIN))
 524                return -EACCES;
 525
 526        x = simple_strtoul(buf, NULL, 0);
 527
 528        if (check_zero && !x)
 529                return -EINVAL;
 530
 531        spin_lock(&gt->gt_spin);
 532        *field = x;
 533        spin_unlock(&gt->gt_spin);
 534        return len;
 535}
 536
 537#define TUNE_ATTR_3(name, show, store)                                        \
 538static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 539
 540#define TUNE_ATTR_2(name, store)                                              \
 541static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 542{                                                                             \
 543        return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 544}                                                                             \
 545TUNE_ATTR_3(name, name##_show, store)
 546
 547#define TUNE_ATTR(name, check_zero)                                           \
 548static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 549{                                                                             \
 550        return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 551}                                                                             \
 552TUNE_ATTR_2(name, name##_store)
 553
 554TUNE_ATTR(quota_warn_period, 0);
 555TUNE_ATTR(quota_quantum, 0);
 556TUNE_ATTR(max_readahead, 0);
 557TUNE_ATTR(complain_secs, 0);
 558TUNE_ATTR(statfs_slow, 0);
 559TUNE_ATTR(new_files_jdata, 0);
 560TUNE_ATTR(quota_simul_sync, 1);
 561TUNE_ATTR(statfs_quantum, 1);
 562TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 563
 564static struct attribute *tune_attrs[] = {
 565        &tune_attr_quota_warn_period.attr,
 566        &tune_attr_quota_quantum.attr,
 567        &tune_attr_max_readahead.attr,
 568        &tune_attr_complain_secs.attr,
 569        &tune_attr_statfs_slow.attr,
 570        &tune_attr_quota_simul_sync.attr,
 571        &tune_attr_statfs_quantum.attr,
 572        &tune_attr_quota_scale.attr,
 573        &tune_attr_new_files_jdata.attr,
 574        NULL,
 575};
 576
 577static struct attribute_group tune_group = {
 578        .name = "tune",
 579        .attrs = tune_attrs,
 580};
 581
 582static struct attribute_group lock_module_group = {
 583        .name = "lock_module",
 584        .attrs = lock_module_attrs,
 585};
 586
 587int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 588{
 589        struct super_block *sb = sdp->sd_vfs;
 590        int error;
 591        char ro[20];
 592        char spectator[20];
 593        char *envp[] = { ro, spectator, NULL };
 594        int sysfs_frees_sdp = 0;
 595
 596        sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
 597        sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 598
 599        sdp->sd_kobj.kset = gfs2_kset;
 600        error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 601                                     "%s", sdp->sd_table_name);
 602        if (error)
 603                goto fail_reg;
 604
 605        sysfs_frees_sdp = 1; /* Freeing sdp is now done by sysfs calling
 606                                function gfs2_sbd_release. */
 607        error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 608        if (error)
 609                goto fail_reg;
 610
 611        error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 612        if (error)
 613                goto fail_tune;
 614
 615        error = sysfs_create_link(&sdp->sd_kobj,
 616                                  &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 617                                  "device");
 618        if (error)
 619                goto fail_lock_module;
 620
 621        kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 622        return 0;
 623
 624fail_lock_module:
 625        sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 626fail_tune:
 627        sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 628fail_reg:
 629        free_percpu(sdp->sd_lkstats);
 630        fs_err(sdp, "error %d adding sysfs files", error);
 631        if (sysfs_frees_sdp)
 632                kobject_put(&sdp->sd_kobj);
 633        else
 634                kfree(sdp);
 635        sb->s_fs_info = NULL;
 636        return error;
 637}
 638
 639void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 640{
 641        sysfs_remove_link(&sdp->sd_kobj, "device");
 642        sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 643        sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 644        kobject_put(&sdp->sd_kobj);
 645}
 646
 647static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 648                       struct kobj_uevent_env *env)
 649{
 650        struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 651        struct super_block *s = sdp->sd_vfs;
 652        const u8 *uuid = s->s_uuid;
 653
 654        add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 655        add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 656        if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 657                add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
 658        if (gfs2_uuid_valid(uuid))
 659                add_uevent_var(env, "UUID=%pUB", uuid);
 660        return 0;
 661}
 662
 663static const struct kset_uevent_ops gfs2_uevent_ops = {
 664        .uevent = gfs2_uevent,
 665};
 666
 667int gfs2_sys_init(void)
 668{
 669        gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 670        if (!gfs2_kset)
 671                return -ENOMEM;
 672        return 0;
 673}
 674
 675void gfs2_sys_uninit(void)
 676{
 677        kset_unregister(gfs2_kset);
 678}
 679
 680
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