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/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/module.h>
  16 #include <linux/kobject.h>
  17 #include <asm/uaccess.h>
  18 #include <linux/gfs2_ondisk.h>
  19 #include <linux/genhd.h>
  20
  21 #include "gfs2.h"
  22 #include "incore.h"
  23 #include "sys.h"
  24 #include "super.h"
  25 #include "glock.h"
  26 #include "quota.h"
  27 #include "util.h"
  28 #include "glops.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 fsname_show(struct gfs2_sbd *sdp, char *buf)
  67 {
  68         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
  69 }
  70
  71 static 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
  82 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
  83 {
  84         const u8 *uuid = sdp->sd_sb.sb_uuid;
  85         buf[0] = '\0';
  86         if (!gfs2_uuid_valid(uuid))
  87                 return 0;
  88         return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
  89 }
  90
  91 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  92 {
  93         unsigned int count;
  94
  95         mutex_lock(&sdp->sd_freeze_lock);
  96         count = sdp->sd_freeze_count;
  97         mutex_unlock(&sdp->sd_freeze_lock);
  98
  99         return snprintf(buf, PAGE_SIZE, "%u\n", count);
 100 }
 101
 102 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 103 {
 104         ssize_t ret = len;
 105         int error = 0;
 106         int n = simple_strtol(buf, NULL, 0);
 107
 108         if (!capable(CAP_SYS_ADMIN))
 109                 return -EACCES;
 110
 111         switch (n) {
 112         case 0:
 113                 gfs2_unfreeze_fs(sdp);
 114                 break;
 115         case 1:
 116                 error = gfs2_freeze_fs(sdp);
 117                 break;
 118         default:
 119                 ret = -EINVAL;
 120         }
 121
 122         if (error)
 123                 fs_warn(sdp, "freeze %d error %d", n, error);
 124
 125         return ret;
 126 }
 127
 128 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 129 {
 130         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
 131         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 132 }
 133
 134 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 135 {
 136         if (!capable(CAP_SYS_ADMIN))
 137                 return -EACCES;
 138
 139         if (simple_strtol(buf, NULL, 0) != 1)
 140                 return -EINVAL;
 141
 142         gfs2_lm_withdraw(sdp,
 143                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
 144                 sdp->sd_fsname);
 145         return len;
 146 }
 147
 148 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 149                                  size_t len)
 150 {
 151         if (!capable(CAP_SYS_ADMIN))
 152                 return -EACCES;
 153
 154         if (simple_strtol(buf, NULL, 0) != 1)
 155                 return -EINVAL;
 156
 157         gfs2_statfs_sync(sdp->sd_vfs, 0);
 158         return len;
 159 }
 160
 161 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 162                                 size_t len)
 163 {
 164         if (!capable(CAP_SYS_ADMIN))
 165                 return -EACCES;
 166
 167         if (simple_strtol(buf, NULL, 0) != 1)
 168                 return -EINVAL;
 169
 170         gfs2_quota_sync(sdp->sd_vfs, 0, 1);
 171         return len;
 172 }
 173
 174 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 175                                         size_t len)
 176 {
 177         int error;
 178         u32 id;
 179
 180         if (!capable(CAP_SYS_ADMIN))
 181                 return -EACCES;
 182
 183         id = simple_strtoul(buf, NULL, 0);
 184
 185         error = gfs2_quota_refresh(sdp, 1, id);
 186         return error ? error : len;
 187 }
 188
 189 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 190                                          size_t len)
 191 {
 192         int error;
 193         u32 id;
 194
 195         if (!capable(CAP_SYS_ADMIN))
 196                 return -EACCES;
 197
 198         id = simple_strtoul(buf, NULL, 0);
 199
 200         error = gfs2_quota_refresh(sdp, 0, id);
 201         return error ? error : len;
 202 }
 203
 204 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 205 {
 206         struct gfs2_glock *gl;
 207         const struct gfs2_glock_operations *glops;
 208         unsigned int glmode;
 209         unsigned int gltype;
 210         unsigned long long glnum;
 211         char mode[16];
 212         int rv;
 213
 214         if (!capable(CAP_SYS_ADMIN))
 215                 return -EACCES;
 216
 217         rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
 218                     mode);
 219         if (rv != 3)
 220                 return -EINVAL;
 221
 222         if (strcmp(mode, "EX") == 0)
 223                 glmode = LM_ST_UNLOCKED;
 224         else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
 225                 glmode = LM_ST_DEFERRED;
 226         else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
 227                 glmode = LM_ST_SHARED;
 228         else
 229                 return -EINVAL;
 230
 231         if (gltype > LM_TYPE_JOURNAL)
 232                 return -EINVAL;
 233         glops = gfs2_glops_list[gltype];
 234         if (glops == NULL)
 235                 return -EINVAL;
 236         if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
 237                 fs_info(sdp, "demote interface used\n");
 238         rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
 239         if (rv)
 240                 return rv;
 241         gfs2_glock_cb(gl, glmode);
 242         gfs2_glock_put(gl);
 243         return len;
 244 }
 245
 246
 247 #define GFS2_ATTR(name, mode, show, store) \
 248 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 249
 250 GFS2_ATTR(id,                  0444, id_show,       NULL);
 251 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 252 GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
 253 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 254 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 255 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 256 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 257 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 258 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 259 GFS2_ATTR(demote_rq,           0200, NULL,          demote_rq_store);
 260
 261 static struct attribute *gfs2_attrs[] = {
 262         &gfs2_attr_id.attr,
 263         &gfs2_attr_fsname.attr,
 264         &gfs2_attr_uuid.attr,
 265         &gfs2_attr_freeze.attr,
 266         &gfs2_attr_withdraw.attr,
 267         &gfs2_attr_statfs_sync.attr,
 268         &gfs2_attr_quota_sync.attr,
 269         &gfs2_attr_quota_refresh_user.attr,
 270         &gfs2_attr_quota_refresh_group.attr,
 271         &gfs2_attr_demote_rq.attr,
 272         NULL,
 273 };
 274
 275 static struct kobj_type gfs2_ktype = {
 276         .default_attrs = gfs2_attrs,
 277         .sysfs_ops     = &gfs2_attr_ops,
 278 };
 279
 280
 281 /*
 282  * lock_module. Originally from lock_dlm
 283  */
 284
 285 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
 286 {
 287         const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
 288         return sprintf(buf, "%s\n", ops->lm_proto_name);
 289 }
 290
 291 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
 292 {
 293         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 294         ssize_t ret;
 295         int val = 0;
 296
 297         if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
 298                 val = 1;
 299         ret = sprintf(buf, "%d\n", val);
 300         return ret;
 301 }
 302
 303 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 304 {
 305         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 306         ssize_t ret = len;
 307         int val;
 308
 309         val = simple_strtol(buf, NULL, 0);
 310
 311         if (val == 1)
 312                 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
 313         else if (val == 0) {
 314                 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
 315                 smp_mb__after_clear_bit();
 316                 gfs2_glock_thaw(sdp);
 317         } else {
 318                 ret = -EINVAL;
 319         }
 320         return ret;
 321 }
 322
 323 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
 324 {
 325         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 326         return sprintf(buf, "%d\n", ls->ls_first);
 327 }
 328
 329 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 330 {
 331         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 332         return sprintf(buf, "%d\n", ls->ls_first_done);
 333 }
 334
 335 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 336 {
 337         unsigned jid;
 338         struct gfs2_jdesc *jd;
 339         int rv;
 340
 341         rv = sscanf(buf, "%u", &jid);
 342         if (rv != 1)
 343                 return -EINVAL;
 344
 345         rv = -ESHUTDOWN;
 346         spin_lock(&sdp->sd_jindex_spin);
 347         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
 348                 goto out;
 349         rv = -EBUSY;
 350         if (sdp->sd_jdesc->jd_jid == jid)
 351                 goto out;
 352         rv = -ENOENT;
 353         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 354                 if (jd->jd_jid != jid)
 355                         continue;
 356                 rv = slow_work_enqueue(&jd->jd_work);
 357                 break;
 358         }
 359 out:
 360         spin_unlock(&sdp->sd_jindex_spin);
 361         return rv ? rv : len;
 362 }
 363
 364 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
 365 {
 366         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 367         return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
 368 }
 369
 370 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 371 {
 372         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 373         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 374 }
 375
 376 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 377 {
 378         return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
 379 }
 380
 381 #define GDLM_ATTR(_name,_mode,_show,_store) \
 382 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 383
 384 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 385 GDLM_ATTR(block,                0644, block_show,               block_store);
 386 GDLM_ATTR(withdraw,             0644, withdraw_show,            withdraw_store);
 387 GDLM_ATTR(jid,                  0444, jid_show,                 NULL);
 388 GDLM_ATTR(first,                0444, lkfirst_show,             NULL);
 389 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 390 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 391 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 392 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 393
 394 static struct attribute *lock_module_attrs[] = {
 395         &gdlm_attr_proto_name.attr,
 396         &gdlm_attr_block.attr,
 397         &gdlm_attr_withdraw.attr,
 398         &gdlm_attr_jid.attr,
 399         &gdlm_attr_first.attr,
 400         &gdlm_attr_first_done.attr,
 401         &gdlm_attr_recover.attr,
 402         &gdlm_attr_recover_done.attr,
 403         &gdlm_attr_recover_status.attr,
 404         NULL,
 405 };
 406
 407 /*
 408  * get and set struct gfs2_tune fields
 409  */
 410
 411 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 412 {
 413         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 414                         sdp->sd_tune.gt_quota_scale_num,
 415                         sdp->sd_tune.gt_quota_scale_den);
 416 }
 417
 418 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 419                                  size_t len)
 420 {
 421         struct gfs2_tune *gt = &sdp->sd_tune;
 422         unsigned int x, y;
 423
 424         if (!capable(CAP_SYS_ADMIN))
 425                 return -EACCES;
 426
 427         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 428                 return -EINVAL;
 429
 430         spin_lock(&gt->gt_spin);
 431         gt->gt_quota_scale_num = x;
 432         gt->gt_quota_scale_den = y;
 433         spin_unlock(&gt->gt_spin);
 434         return len;
 435 }
 436
 437 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 438                         int check_zero, const char *buf, size_t len)
 439 {
 440         struct gfs2_tune *gt = &sdp->sd_tune;
 441         unsigned int x;
 442
 443         if (!capable(CAP_SYS_ADMIN))
 444                 return -EACCES;
 445
 446         x = simple_strtoul(buf, NULL, 0);
 447
 448         if (check_zero && !x)
 449                 return -EINVAL;
 450
 451         spin_lock(&gt->gt_spin);
 452         *field = x;
 453         spin_unlock(&gt->gt_spin);
 454         return len;
 455 }
 456
 457 #define TUNE_ATTR_3(name, show, store)                                        \
 458 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 459
 460 #define TUNE_ATTR_2(name, store)                                              \
 461 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 462 {                                                                             \
 463         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 464 }                                                                             \
 465 TUNE_ATTR_3(name, name##_show, store)
 466
 467 #define TUNE_ATTR(name, check_zero)                                           \
 468 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 469 {                                                                             \
 470         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 471 }                                                                             \
 472 TUNE_ATTR_2(name, name##_store)
 473
 474 TUNE_ATTR(quota_warn_period, 0);
 475 TUNE_ATTR(quota_quantum, 0);
 476 TUNE_ATTR(max_readahead, 0);
 477 TUNE_ATTR(complain_secs, 0);
 478 TUNE_ATTR(statfs_slow, 0);
 479 TUNE_ATTR(new_files_jdata, 0);
 480 TUNE_ATTR(quota_simul_sync, 1);
 481 TUNE_ATTR(statfs_quantum, 1);
 482 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 483
 484 static struct attribute *tune_attrs[] = {
 485         &tune_attr_quota_warn_period.attr,
 486         &tune_attr_quota_quantum.attr,
 487         &tune_attr_max_readahead.attr,
 488         &tune_attr_complain_secs.attr,
 489         &tune_attr_statfs_slow.attr,
 490         &tune_attr_quota_simul_sync.attr,
 491         &tune_attr_statfs_quantum.attr,
 492         &tune_attr_quota_scale.attr,
 493         &tune_attr_new_files_jdata.attr,
 494         NULL,
 495 };
 496
 497 static struct attribute_group tune_group = {
 498         .name = "tune",
 499         .attrs = tune_attrs,
 500 };
 501
 502 static struct attribute_group lock_module_group = {
 503         .name = "lock_module",
 504         .attrs = lock_module_attrs,
 505 };
 506
 507 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 508 {
 509         struct super_block *sb = sdp->sd_vfs;
 510         int error;
 511         char ro[20];
 512         char spectator[20];
 513         char *envp[] = { ro, spectator, NULL };
 514
 515         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
 516         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
 517
 518         sdp->sd_kobj.kset = gfs2_kset;
 519         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 520                                      "%s", sdp->sd_table_name);
 521         if (error)
 522                 goto fail;
 523
 524         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 525         if (error)
 526                 goto fail_reg;
 527
 528         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 529         if (error)
 530                 goto fail_tune;
 531
 532         error = sysfs_create_link(&sdp->sd_kobj,
 533                                   &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
 534                                   "device");
 535         if (error)
 536                 goto fail_lock_module;
 537
 538         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
 539         return 0;
 540
 541 fail_lock_module:
 542         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 543 fail_tune:
 544         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 545 fail_reg:
 546         kobject_put(&sdp->sd_kobj);
 547 fail:
 548         fs_err(sdp, "error %d adding sysfs files", error);
 549         return error;
 550 }
 551
 552 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 553 {
 554         sysfs_remove_link(&sdp->sd_kobj, "device");
 555         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 556         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 557         kobject_put(&sdp->sd_kobj);
 558 }
 559
 560 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 561                        struct kobj_uevent_env *env)
 562 {
 563         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 564         const u8 *uuid = sdp->sd_sb.sb_uuid;
 565
 566         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 567         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 568         if (!sdp->sd_args.ar_spectator)
 569                 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid);
 570         if (gfs2_uuid_valid(uuid))
 571                 add_uevent_var(env, "UUID=%pUB", uuid);
 572         return 0;
 573 }
 574
 575 static const struct kset_uevent_ops gfs2_uevent_ops = {
 576         .uevent = gfs2_uevent,
 577 };
 578
 579 int gfs2_sys_init(void)
 580 {
 581         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 582         if (!gfs2_kset)
 583                 return -ENOMEM;
 584         return 0;
 585 }
 586
 587 void gfs2_sys_uninit(void)
 588 {
 589         kset_unregister(gfs2_kset);
 590 }
 591