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
  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 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, "%02X%02X%02X%02X-%02X%02X-"
  88                         "%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\n",
  89                         uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5],
  90                         uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11],
  91                         uuid[12], uuid[13], uuid[14], uuid[15]);
  92 }
  93
  94 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  95 {
  96         unsigned int count;
  97
  98         mutex_lock(&sdp->sd_freeze_lock);
  99         count = sdp->sd_freeze_count;
 100         mutex_unlock(&sdp->sd_freeze_lock);
 101
 102         return snprintf(buf, PAGE_SIZE, "%u\n", count);
 103 }
 104
 105 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 106 {
 107         ssize_t ret = len;
 108         int error = 0;
 109         int n = simple_strtol(buf, NULL, 0);
 110
 111         if (!capable(CAP_SYS_ADMIN))
 112                 return -EACCES;
 113
 114         switch (n) {
 115         case 0:
 116                 gfs2_unfreeze_fs(sdp);
 117                 break;
 118         case 1:
 119                 error = gfs2_freeze_fs(sdp);
 120                 break;
 121         default:
 122                 ret = -EINVAL;
 123         }
 124
 125         if (error)
 126                 fs_warn(sdp, "freeze %d error %d", n, error);
 127
 128         return ret;
 129 }
 130
 131 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
 132 {
 133         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
 134         return snprintf(buf, PAGE_SIZE, "%u\n", b);
 135 }
 136
 137 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 138 {
 139         if (!capable(CAP_SYS_ADMIN))
 140                 return -EACCES;
 141
 142         if (simple_strtol(buf, NULL, 0) != 1)
 143                 return -EINVAL;
 144
 145         gfs2_lm_withdraw(sdp,
 146                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
 147                 sdp->sd_fsname);
 148         return len;
 149 }
 150
 151 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 152                                  size_t len)
 153 {
 154         if (!capable(CAP_SYS_ADMIN))
 155                 return -EACCES;
 156
 157         if (simple_strtol(buf, NULL, 0) != 1)
 158                 return -EINVAL;
 159
 160         gfs2_statfs_sync(sdp);
 161         return len;
 162 }
 163
 164 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 165                                 size_t len)
 166 {
 167         if (!capable(CAP_SYS_ADMIN))
 168                 return -EACCES;
 169
 170         if (simple_strtol(buf, NULL, 0) != 1)
 171                 return -EINVAL;
 172
 173         gfs2_quota_sync(sdp);
 174         return len;
 175 }
 176
 177 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 178                                         size_t len)
 179 {
 180         u32 id;
 181
 182         if (!capable(CAP_SYS_ADMIN))
 183                 return -EACCES;
 184
 185         id = simple_strtoul(buf, NULL, 0);
 186
 187         gfs2_quota_refresh(sdp, 1, id);
 188         return len;
 189 }
 190
 191 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 192                                          size_t len)
 193 {
 194         u32 id;
 195
 196         if (!capable(CAP_SYS_ADMIN))
 197                 return -EACCES;
 198
 199         id = simple_strtoul(buf, NULL, 0);
 200
 201         gfs2_quota_refresh(sdp, 0, id);
 202         return len;
 203 }
 204
 205 static 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         glops = gfs2_glops_list[gltype];
 235         if (glops == NULL)
 236                 return -EINVAL;
 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 lkid_show(struct gfs2_sbd *sdp, char *buf)
 323 {
 324         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 325         return sprintf(buf, "%u\n", ls->ls_id);
 326 }
 327
 328 static ssize_t lkfirst_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);
 332 }
 333
 334 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
 335 {
 336         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 337         return sprintf(buf, "%d\n", ls->ls_first_done);
 338 }
 339
 340 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 341 {
 342         unsigned jid;
 343         struct gfs2_jdesc *jd;
 344         int rv;
 345
 346         rv = sscanf(buf, "%u", &jid);
 347         if (rv != 1)
 348                 return -EINVAL;
 349
 350         rv = -ESHUTDOWN;
 351         spin_lock(&sdp->sd_jindex_spin);
 352         if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
 353                 goto out;
 354         rv = -EBUSY;
 355         if (sdp->sd_jdesc->jd_jid == jid)
 356                 goto out;
 357         rv = -ENOENT;
 358         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 359                 if (jd->jd_jid != jid)
 360                         continue;
 361                 rv = slow_work_enqueue(&jd->jd_work);
 362                 break;
 363         }
 364 out:
 365         spin_unlock(&sdp->sd_jindex_spin);
 366         return rv ? rv : len;
 367 }
 368
 369 static ssize_t recover_done_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_done);
 373 }
 374
 375 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
 376 {
 377         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 378         return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
 379 }
 380
 381 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
 382 {
 383         return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
 384 }
 385
 386 #define GDLM_ATTR(_name,_mode,_show,_store) \
 387 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 388
 389 GDLM_ATTR(proto_name,           0444, proto_name_show,          NULL);
 390 GDLM_ATTR(block,                0644, block_show,               block_store);
 391 GDLM_ATTR(withdraw,             0644, withdraw_show,            withdraw_store);
 392 GDLM_ATTR(id,                   0444, lkid_show,                NULL);
 393 GDLM_ATTR(jid,                  0444, jid_show,                 NULL);
 394 GDLM_ATTR(first,                0444, lkfirst_show,             NULL);
 395 GDLM_ATTR(first_done,           0444, first_done_show,          NULL);
 396 GDLM_ATTR(recover,              0600, NULL,                     recover_store);
 397 GDLM_ATTR(recover_done,         0444, recover_done_show,        NULL);
 398 GDLM_ATTR(recover_status,       0444, recover_status_show,      NULL);
 399
 400 static struct attribute *lock_module_attrs[] = {
 401         &gdlm_attr_proto_name.attr,
 402         &gdlm_attr_block.attr,
 403         &gdlm_attr_withdraw.attr,
 404         &gdlm_attr_id.attr,
 405         &gdlm_attr_jid.attr,
 406         &gdlm_attr_first.attr,
 407         &gdlm_attr_first_done.attr,
 408         &gdlm_attr_recover.attr,
 409         &gdlm_attr_recover_done.attr,
 410         &gdlm_attr_recover_status.attr,
 411         NULL,
 412 };
 413
 414 /*
 415  * get and set struct gfs2_tune fields
 416  */
 417
 418 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 419 {
 420         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 421                         sdp->sd_tune.gt_quota_scale_num,
 422                         sdp->sd_tune.gt_quota_scale_den);
 423 }
 424
 425 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 426                                  size_t len)
 427 {
 428         struct gfs2_tune *gt = &sdp->sd_tune;
 429         unsigned int x, y;
 430
 431         if (!capable(CAP_SYS_ADMIN))
 432                 return -EACCES;
 433
 434         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 435                 return -EINVAL;
 436
 437         spin_lock(&gt->gt_spin);
 438         gt->gt_quota_scale_num = x;
 439         gt->gt_quota_scale_den = y;
 440         spin_unlock(&gt->gt_spin);
 441         return len;
 442 }
 443
 444 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 445                         int check_zero, const char *buf, size_t len)
 446 {
 447         struct gfs2_tune *gt = &sdp->sd_tune;
 448         unsigned int x;
 449
 450         if (!capable(CAP_SYS_ADMIN))
 451                 return -EACCES;
 452
 453         x = simple_strtoul(buf, NULL, 0);
 454
 455         if (check_zero && !x)
 456                 return -EINVAL;
 457
 458         spin_lock(&gt->gt_spin);
 459         *field = x;
 460         spin_unlock(&gt->gt_spin);
 461         return len;
 462 }
 463
 464 #define TUNE_ATTR_3(name, show, store)                                        \
 465 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 466
 467 #define TUNE_ATTR_2(name, store)                                              \
 468 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 469 {                                                                             \
 470         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 471 }                                                                             \
 472 TUNE_ATTR_3(name, name##_show, store)
 473
 474 #define TUNE_ATTR(name, check_zero)                                           \
 475 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 476 {                                                                             \
 477         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 478 }                                                                             \
 479 TUNE_ATTR_2(name, name##_store)
 480
 481 TUNE_ATTR(incore_log_blocks, 0);
 482 TUNE_ATTR(log_flush_secs, 0);
 483 TUNE_ATTR(quota_warn_period, 0);
 484 TUNE_ATTR(quota_quantum, 0);
 485 TUNE_ATTR(max_readahead, 0);
 486 TUNE_ATTR(complain_secs, 0);
 487 TUNE_ATTR(statfs_slow, 0);
 488 TUNE_ATTR(new_files_jdata, 0);
 489 TUNE_ATTR(quota_simul_sync, 1);
 490 TUNE_ATTR(stall_secs, 1);
 491 TUNE_ATTR(statfs_quantum, 1);
 492 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 493
 494 static struct attribute *tune_attrs[] = {
 495         &tune_attr_incore_log_blocks.attr,
 496         &tune_attr_log_flush_secs.attr,
 497         &tune_attr_quota_warn_period.attr,
 498         &tune_attr_quota_quantum.attr,
 499         &tune_attr_max_readahead.attr,
 500         &tune_attr_complain_secs.attr,
 501         &tune_attr_statfs_slow.attr,
 502         &tune_attr_quota_simul_sync.attr,
 503         &tune_attr_stall_secs.attr,
 504         &tune_attr_statfs_quantum.attr,
 505         &tune_attr_quota_scale.attr,
 506         &tune_attr_new_files_jdata.attr,
 507         NULL,
 508 };
 509
 510 static struct attribute_group tune_group = {
 511         .name = "tune",
 512         .attrs = tune_attrs,
 513 };
 514
 515 static struct attribute_group lock_module_group = {
 516         .name = "lock_module",
 517         .attrs = lock_module_attrs,
 518 };
 519
 520 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 521 {
 522         int error;
 523
 524         sdp->sd_kobj.kset = gfs2_kset;
 525         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 526                                      "%s", sdp->sd_table_name);
 527         if (error)
 528                 goto fail;
 529
 530         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 531         if (error)
 532                 goto fail_reg;
 533
 534         error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
 535         if (error)
 536                 goto fail_tune;
 537
 538         kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
 539         return 0;
 540
 541 fail_tune:
 542         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 543 fail_reg:
 544         kobject_put(&sdp->sd_kobj);
 545 fail:
 546         fs_err(sdp, "error %d adding sysfs files", error);
 547         return error;
 548 }
 549
 550 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 551 {
 552         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 553         sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
 554         kobject_put(&sdp->sd_kobj);
 555 }
 556
 557
 558 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 559                        struct kobj_uevent_env *env)
 560 {
 561         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 562         const u8 *uuid = sdp->sd_sb.sb_uuid;
 563
 564         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 565         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 566         if (gfs2_uuid_valid(uuid)) {
 567                 add_uevent_var(env, "UUID=%02X%02X%02X%02X-%02X%02X-%02X%02X-"
 568                                "%02X%02X-%02X%02X%02X%02X%02X%02X",
 569                                uuid[0], uuid[1], uuid[2], uuid[3], uuid[4],
 570                                uuid[5], uuid[6], uuid[7], uuid[8], uuid[9],
 571                                uuid[10], uuid[11], uuid[12], uuid[13],
 572                                uuid[14], uuid[15]);
 573         }
 574         return 0;
 575 }
 576
 577 static struct kset_uevent_ops gfs2_uevent_ops = {
 578         .uevent = gfs2_uevent,
 579 };
 580
 581
 582 int gfs2_sys_init(void)
 583 {
 584         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 585         if (!gfs2_kset)
 586                 return -ENOMEM;
 587         return 0;
 588 }
 589
 590 void gfs2_sys_uninit(void)
 591 {
 592         kset_unregister(gfs2_kset);
 593 }
 594