fs/gfs2/sys.c

   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
  29 struct gfs2_attr {
  30         struct attribute attr;
  31         ssize_t (*show)(struct gfs2_sbd *, char *);
  32         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
  33 };
  34
  35 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
  36                               char *buf)
  37 {
  38         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
  39         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
  40         return a->show ? a->show(sdp, buf) : 0;
  41 }
  42
  43 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
  44                                const char *buf, size_t len)
  45 {
  46         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
  47         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
  48         return a->store ? a->store(sdp, buf, len) : len;
  49 }
  50
  51 static const struct sysfs_ops gfs2_attr_ops = {
  52         .show  = gfs2_attr_show,
  53         .store = gfs2_attr_store,
  54 };
  55
  56
  57 static struct kset *gfs2_kset;
  58
  59 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  60 {
  61         return snprintf(buf, PAGE_SIZE, "%u:%u\n",
  62                         MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
  63 }
  64
  65 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  66 {
  67         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
  68 }
  69
  70 static int gfs2_uuid_valid(const u8 *uuid)
  71 {
  72         int i;
  73
  74         for (i = 0; i < 16; i++) {
  75                 if (uuid[i])
  76                         return 1;
  77         }
  78         return 0;
  79 }
  80
  81 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
  82 {
  83         const u8 *uuid = sdp->sd_sb.sb_uuid;
  84         buf[0] = '\0';
  85         if (!gfs2_uuid_valid(uuid))
  86                 return 0;
  87         return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
  88 }
  89
  90 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  91 {
  92         unsigned int count;
  93
  94         mutex_lock(&sdp->sd_freeze_lock);
  95         count = sdp->sd_freeze_count;
  96         mutex_unlock(&sdp->sd_freeze_lock);
  97
  98         return snprintf(buf, PAGE_SIZE, "%u\n", count);
  99 }
 100
 101 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 102 {
 103         ssize_t ret = len;
 104         int error = 0;
 105         int n = simple_strtol(buf, NULL, 0);
 106
 107         if (!capable(CAP_SYS_ADMIN))
 108                 return -EACCES;
 109
 110         switch (n) {
 111         case 0:
 112                 gfs2_unfreeze_fs(sdp);
 113                 break;
 114         case 1:
 115                 error = gfs2_freeze_fs(sdp);
 116                 break;
 117         default:
 118                 ret = -EINVAL;
 119         }
 120
 121         if (error)
 122                 fs_warn(sdp, "freeze %d error %d", n, error);
 123
 124         return ret;
 125 }
 126
 127 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 128 {
 129         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
 130         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 131 }
 132
 133 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 134 {
 135         if (!capable(CAP_SYS_ADMIN))
 136                 return -EACCES;
 137
 138         if (simple_strtol(buf, NULL, 0) != 1)
 139                 return -EINVAL;
 140
 141         gfs2_lm_withdraw(sdp,
 142                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
 143                 sdp->sd_fsname);
 144         return len;
 145 }
 146
 147 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 148                                  size_t len)
 149 {
 150         if (!capable(CAP_SYS_ADMIN))
 151                 return -EACCES;
 152
 153         if (simple_strtol(buf, NULL, 0) != 1)
 154                 return -EINVAL;
 155
 156         gfs2_statfs_sync(sdp->sd_vfs, 0);
 157         return len;
 158 }
 159
 160 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 161                                 size_t len)
 162 {
 163         if (!capable(CAP_SYS_ADMIN))
 164                 return -EACCES;
 165
 166         if (simple_strtol(buf, NULL, 0) != 1)
 167                 return -EINVAL;
 168
 169         gfs2_quota_sync(sdp->sd_vfs, 0, 1);
 170         return len;
 171 }
 172
 173 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 174                                         size_t len)
 175 {
 176         int error;
 177         u32 id;
 178
 179         if (!capable(CAP_SYS_ADMIN))
 180                 return -EACCES;
 181
 182         id = simple_strtoul(buf, NULL, 0);
 183
 184         error = gfs2_quota_refresh(sdp, 1, id);
 185         return error ? error : len;
 186 }
 187
 188 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 189                                          size_t len)
 190 {
 191         int error;
 192         u32 id;
 193
 194         if (!capable(CAP_SYS_ADMIN))
 195                 return -EACCES;
 196
 197         id = simple_strtoul(buf, NULL, 0);
 198
 199         error = gfs2_quota_refresh(sdp, 0, id);
 200         return error ? error : len;
 201 }
 202
 203 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 204 {
 205         struct gfs2_glock *gl;
 206         const struct gfs2_glock_operations *glops;
 207         unsigned int glmode;
 208         unsigned int gltype;
 209         unsigned long long glnum;
 210         char mode[16];
 211         int rv;
 212
 213         if (!capable(CAP_SYS_ADMIN))
 214                 return -EACCES;
 215
 216         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 217                     mode);
 218         if (rv != 3)
 219                 return -EINVAL;
 220
 221         if (strcmp(mode, "EX") == 0)
 222                 glmode = LM_ST_UNLOCKED;
 223         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 224                 glmode = LM_ST_DEFERRED;
 225         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 226                 glmode = LM_ST_SHARED;
 227         else
 228                 return -EINVAL;
 229
 230         if (gltype > LM_TYPE_JOURNAL)
 231                 return -EINVAL;
 232         glops = gfs2_glops_list[gltype];
 233         if (glops == NULL)
 234                 return -EINVAL;
 235         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 236                 fs_info(sdp, "demote interface used\n");
 237         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 238         if (rv)
 239                 return rv;
 240         gfs2_glock_cb(gl, glmode);
 241         gfs2_glock_put(gl);
 242         return len;
 243 }
 244
 245
 246 #define GFS2_ATTR(name, mode, show, store) \
 247 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 248
 249 GFS2_ATTR(id,                  0444, id_show,       NULL);
 250 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 251 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 252 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 253 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 254 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 255 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 256 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 257 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 258 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 259
 260 static struct attribute *gfs2_attrs[] = {
 261         &gfs2_attr_id.attr,
 262         &gfs2_attr_fsname.attr,
 263         &gfs2_attr_uuid.attr,
 264         &gfs2_attr_freeze.attr,
 265         &gfs2_attr_withdraw.attr,
 266         &gfs2_attr_statfs_sync.attr,
 267         &gfs2_attr_quota_sync.attr,
 268         &gfs2_attr_quota_refresh_user.attr,
 269         &gfs2_attr_quota_refresh_group.attr,
 270         &gfs2_attr_demote_rq.attr,
 271         NULL,
 272 };
 273
 274 static struct kobj_type gfs2_ktype = {
 275         .default_attrs = gfs2_attrs,
 276         .sysfs_ops     = &gfs2_attr_ops,
 277 };
 278
 279
 280 /*
 281  * lock_module. Originally from lock_dlm
 282  */
 283
 284 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 285 {
 286         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 287         return sprintf(buf, "%s\n", ops->lm_proto_name);
 288 }
 289
 290 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 291 {
 292         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 293         ssize_t ret;
 294         int val = 0;
 295
 296         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
 297                 val = 1;
 298         ret = sprintf(buf, "%d\n", val);
 299         return ret;
 300 }
 301
 302 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 303 {
 304         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 305         ssize_t ret = len;
 306         int val;
 307
 308         val = simple_strtol(buf, NULL, 0);
 309
 310         if (val == 1)
 311                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
 312         else if (val == 0) {
 313                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
 314                 smp_mb__after_clear_bit();
 315                 gfs2_glock_thaw(sdp);
 316         } else {
 317                 ret = -EINVAL;
 318         }
 319         return ret;
 320 }
 321
 322 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 323 {
 324         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 325         return sprintf(buf, "%d\n", ls->ls_first);
 326 }
 327
 328 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 329 {
 330         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 331         return sprintf(buf, "%d\n", ls->ls_first_done);
 332 }
 333
 334 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 335 {
 336         unsigned jid;
 337         struct gfs2_jdesc *jd;
 338         int rv;
 339
 340         rv = sscanf(buf, "%u", &jid);
 341         if (rv != 1)
 342                 return -EINVAL;
 343
 344         rv = -ESHUTDOWN;
 345         spin_lock(&sdp->sd_jindex_spin);
 346         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
 347                 goto out;
 348         rv = -EBUSY;
 349         if (sdp->sd_jdesc->jd_jid == jid)
 350                 goto out;
 351         rv = -ENOENT;
 352         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 353                 if (jd->jd_jid != jid)
 354                         continue;
 355                 rv = slow_work_enqueue(&jd->jd_work);
 356                 break;
 357         }
 358 out:
 359         spin_unlock(&sdp->sd_jindex_spin);
 360         return rv ? rv : len;
 361 }
 362
 363 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 364 {
 365         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 366         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 367 }
 368
 369 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 370 {
 371         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 372         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 373 }
 374
 375 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 376 {
 377         return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
 378 }
 379
 380 #define GDLM_ATTR(_name,_mode,_show,_store) \
 381 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 382
 383 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 384 GDLM_ATTR(block,                0644, block_show,               block_store);
 385 GDLM_ATTR(withdraw,             0644, withdraw_show,            withdraw_store);
 386 GDLM_ATTR(jid,                  0444, jid_show,                 NULL);
 387 GDLM_ATTR(first,                0444, lkfirst_show,             NULL);
 388 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 389 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 390 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 391 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 392
 393 static struct attribute *lock_module_attrs[] = {
 394         &gdlm_attr_proto_name.attr,
 395         &gdlm_attr_block.attr,
 396         &gdlm_attr_withdraw.attr,
 397         &gdlm_attr_jid.attr,
 398         &gdlm_attr_first.attr,
 399         &gdlm_attr_first_done.attr,
 400         &gdlm_attr_recover.attr,
 401         &gdlm_attr_recover_done.attr,
 402         &gdlm_attr_recover_status.attr,
 403         NULL,
 404 };
 405
 406 /*
 407  * get and set struct gfs2_tune fields
 408  */
 409
 410 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 411 {
 412         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 413                         sdp->sd_tune.gt_quota_scale_num,
 414                         sdp->sd_tune.gt_quota_scale_den);
 415 }
 416
 417 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 418                                  size_t len)
 419 {
 420         struct gfs2_tune *gt = &sdp->sd_tune;
 421         unsigned int x, y;
 422
 423         if (!capable(CAP_SYS_ADMIN))
 424                 return -EACCES;
 425
 426         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 427                 return -EINVAL;
 428
 429         spin_lock(&gt->gt_spin);
 430         gt->gt_quota_scale_num = x;
 431         gt->gt_quota_scale_den = y;
 432         spin_unlock(&gt->gt_spin);
 433         return len;
 434 }
 435
 436 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 437                         int check_zero, const char *buf, size_t len)
 438 {
 439         struct gfs2_tune *gt = &sdp->sd_tune;
 440         unsigned int x;
 441
 442         if (!capable(CAP_SYS_ADMIN))
 443                 return -EACCES;
 444
 445         x = simple_strtoul(buf, NULL, 0);
 446
 447         if (check_zero && !x)
 448                 return -EINVAL;
 449
 450         spin_lock(&gt->gt_spin);
 451         *field = x;
 452         spin_unlock(&gt->gt_spin);
 453         return len;
 454 }
 455
 456 #define TUNE_ATTR_3(name, show, store)                                        \
 457 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 458
 459 #define TUNE_ATTR_2(name, store)                                              \
 460 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 461 {                                                                             \
 462         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 463 }                                                                             \
 464 TUNE_ATTR_3(name, name##_show, store)
 465
 466 #define TUNE_ATTR(name, check_zero)                                           \
 467 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 468 {                                                                             \
 469         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 470 }                                                                             \
 471 TUNE_ATTR_2(name, name##_store)
 472
 473 TUNE_ATTR(quota_warn_period, 0);
 474 TUNE_ATTR(quota_quantum, 0);
 475 TUNE_ATTR(max_readahead, 0);
 476 TUNE_ATTR(complain_secs, 0);
 477 TUNE_ATTR(statfs_slow, 0);
 478 TUNE_ATTR(new_files_jdata, 0);
 479 TUNE_ATTR(quota_simul_sync, 1);
 480 TUNE_ATTR(statfs_quantum, 1);
 481 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 482
 483 static struct attribute *tune_attrs[] = {
 484         &tune_attr_quota_warn_period.attr,
 485         &tune_attr_quota_quantum.attr,
 486         &tune_attr_max_readahead.attr,
 487         &tune_attr_complain_secs.attr,
 488         &tune_attr_statfs_slow.attr,
 489         &tune_attr_quota_simul_sync.attr,
 490         &tune_attr_statfs_quantum.attr,
 491         &tune_attr_quota_scale.attr,
 492         &tune_attr_new_files_jdata.attr,
 493         NULL,
 494 };
 495
 496 static struct attribute_group tune_group = {
 497         .name = "tune",
 498         .attrs = tune_attrs,
 499 };
 500
 501 static struct attribute_group lock_module_group = {
 502         .name = "lock_module",
 503         .attrs = lock_module_attrs,
 504 };
 505
 506 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 507 {
 508         struct super_block *sb = sdp->sd_vfs;
 509         int error;
 510         char ro[20];
 511         char spectator[20];
 512         char *envp[] = { ro, spectator, NULL };
 513
 514         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
 515         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 516
 517         sdp->sd_kobj.kset = gfs2_kset;
 518         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 519                                      "%s", sdp->sd_table_name);
 520         if (error)
 521                 goto fail;
 522
 523         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 524         if (error)
 525                 goto fail_reg;
 526
 527         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 528         if (error)
 529                 goto fail_tune;
 530
 531         error = sysfs_create_link(&sdp->sd_kobj,
 532                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 533                                   "device");
 534         if (error)
 535                 goto fail_lock_module;
 536
 537         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 538         return 0;
 539
 540 fail_lock_module:
 541         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 542 fail_tune:
 543         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 544 fail_reg:
 545         kobject_put(&sdp->sd_kobj);
 546 fail:
 547         fs_err(sdp, "error %d adding sysfs files", error);
 548         return error;
 549 }
 550
 551 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 552 {
 553         sysfs_remove_link(&sdp->sd_kobj, "device");
 554         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 555         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 556         kobject_put(&sdp->sd_kobj);
 557 }
 558
 559 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 560                        struct kobj_uevent_env *env)
 561 {
 562         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 563         const u8 *uuid = sdp->sd_sb.sb_uuid;
 564
 565         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 566         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 567         if (!sdp->sd_args.ar_spectator)
 568                 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid);
 569         if (gfs2_uuid_valid(uuid))
 570                 add_uevent_var(env, "UUID=%pUB", uuid);
 571         return 0;
 572 }
 573
 574 static const struct kset_uevent_ops gfs2_uevent_ops = {
 575         .uevent = gfs2_uevent,
 576 };
 577
 578 int gfs2_sys_init(void)
 579 {
 580         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 581         if (!gfs2_kset)
 582                 return -ENOMEM;
 583         return 0;
 584 }
 585
 586 void gfs2_sys_uninit(void)
 587 {
 588         kset_unregister(gfs2_kset);
 589 }
 590