fs/gfs2/sys.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 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 v.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/semaphore.h>
  18 #include <asm/uaccess.h>
  19
  20 #include "gfs2.h"
  21 #include "lm.h"
  22 #include "sys.h"
  23 #include "super.h"
  24 #include "glock.h"
  25 #include "quota.h"
  26
  27 char *gfs2_sys_margs;
  28 spinlock_t gfs2_sys_margs_lock;
  29
  30 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  31 {
  32         return sprintf(buf, "%s\n", sdp->sd_vfs->s_id);
  33 }
  34
  35 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  36 {
  37         return sprintf(buf, "%s\n", sdp->sd_fsname);
  38 }
  39
  40 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  41 {
  42         unsigned int count;
  43
  44         mutex_lock(&sdp->sd_freeze_lock);
  45         count = sdp->sd_freeze_count;
  46         mutex_unlock(&sdp->sd_freeze_lock);
  47
  48         return sprintf(buf, "%u\n", count);
  49 }
  50
  51 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  52 {
  53         ssize_t ret = len;
  54         int error = 0;
  55         int n = simple_strtol(buf, NULL, 0);
  56
  57         if (!capable(CAP_SYS_ADMIN))
  58                 return -EACCES;
  59
  60         switch (n) {
  61         case 0:
  62                 gfs2_unfreeze_fs(sdp);
  63                 break;
  64         case 1:
  65                 error = gfs2_freeze_fs(sdp);
  66                 break;
  67         default:
  68                 ret = -EINVAL;
  69         }
  70
  71         if (error)
  72                 fs_warn(sdp, "freeze %d error %d", n, error);
  73
  74         return ret;
  75 }
  76
  77 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
  78 {
  79         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
  80         return sprintf(buf, "%u\n", b);
  81 }
  82
  83 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  84 {
  85         if (!capable(CAP_SYS_ADMIN))
  86                 return -EACCES;
  87
  88         if (simple_strtol(buf, NULL, 0) != 1)
  89                 return -EINVAL;
  90
  91         gfs2_lm_withdraw(sdp,
  92                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
  93                 sdp->sd_fsname);
  94         return len;
  95 }
  96
  97 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
  98                                  size_t len)
  99 {
 100         if (!capable(CAP_SYS_ADMIN))
 101                 return -EACCES;
 102
 103         if (simple_strtol(buf, NULL, 0) != 1)
 104                 return -EINVAL;
 105
 106         gfs2_statfs_sync(sdp);
 107         return len;
 108 }
 109
 110 static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 111 {
 112         if (!capable(CAP_SYS_ADMIN))
 113                 return -EACCES;
 114
 115         if (simple_strtol(buf, NULL, 0) != 1)
 116                 return -EINVAL;
 117
 118         gfs2_gl_hash_clear(sdp, NO_WAIT);
 119         return len;
 120 }
 121
 122 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 123                                 size_t len)
 124 {
 125         if (!capable(CAP_SYS_ADMIN))
 126                 return -EACCES;
 127
 128         if (simple_strtol(buf, NULL, 0) != 1)
 129                 return -EINVAL;
 130
 131         gfs2_quota_sync(sdp);
 132         return len;
 133 }
 134
 135 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 136                                         size_t len)
 137 {
 138         uint32_t id;
 139
 140         if (!capable(CAP_SYS_ADMIN))
 141                 return -EACCES;
 142
 143         id = simple_strtoul(buf, NULL, 0);
 144
 145         gfs2_quota_refresh(sdp, 1, id);
 146         return len;
 147 }
 148
 149 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 150                                          size_t len)
 151 {
 152         uint32_t id;
 153
 154         if (!capable(CAP_SYS_ADMIN))
 155                 return -EACCES;
 156
 157         id = simple_strtoul(buf, NULL, 0);
 158
 159         gfs2_quota_refresh(sdp, 0, id);
 160         return len;
 161 }
 162
 163 struct gfs2_attr {
 164         struct attribute attr;
 165         ssize_t (*show)(struct gfs2_sbd *, char *);
 166         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 167 };
 168
 169 #define GFS2_ATTR(name, mode, show, store) \
 170 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 171
 172 GFS2_ATTR(id,                  0444, id_show,       NULL);
 173 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 174 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 175 GFS2_ATTR(shrink,              0200, NULL,          shrink_store);
 176 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 177 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 178 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 179 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 180 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 181
 182 static struct attribute *gfs2_attrs[] = {
 183         &gfs2_attr_id.attr,
 184         &gfs2_attr_fsname.attr,
 185         &gfs2_attr_freeze.attr,
 186         &gfs2_attr_shrink.attr,
 187         &gfs2_attr_withdraw.attr,
 188         &gfs2_attr_statfs_sync.attr,
 189         &gfs2_attr_quota_sync.attr,
 190         &gfs2_attr_quota_refresh_user.attr,
 191         &gfs2_attr_quota_refresh_group.attr,
 192         NULL,
 193 };
 194
 195 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
 196                               char *buf)
 197 {
 198         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 199         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 200         return a->show ? a->show(sdp, buf) : 0;
 201 }
 202
 203 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
 204                                const char *buf, size_t len)
 205 {
 206         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 207         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 208         return a->store ? a->store(sdp, buf, len) : len;
 209 }
 210
 211 static struct sysfs_ops gfs2_attr_ops = {
 212         .show  = gfs2_attr_show,
 213         .store = gfs2_attr_store,
 214 };
 215
 216 static struct kobj_type gfs2_ktype = {
 217         .default_attrs = gfs2_attrs,
 218         .sysfs_ops     = &gfs2_attr_ops,
 219 };
 220
 221 static struct kset gfs2_kset = {
 222         .subsys = &fs_subsys,
 223         .kobj   = {.name = "gfs2",},
 224         .ktype  = &gfs2_ktype,
 225 };
 226
 227 /*
 228  * display struct lm_lockstruct fields
 229  */
 230
 231 struct lockstruct_attr {
 232         struct attribute attr;
 233         ssize_t (*show)(struct gfs2_sbd *, char *);
 234 };
 235
 236 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
 237 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 238 {                                                                           \
 239         return sprintf(buf, fmt, sdp->sd_lockstruct.ls_##name);             \
 240 }                                                                           \
 241 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
 242
 243 LOCKSTRUCT_ATTR(jid,      "%u\n");
 244 LOCKSTRUCT_ATTR(first,    "%u\n");
 245 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
 246 LOCKSTRUCT_ATTR(flags,    "%d\n");
 247
 248 static struct attribute *lockstruct_attrs[] = {
 249         &lockstruct_attr_jid.attr,
 250         &lockstruct_attr_first.attr,
 251         &lockstruct_attr_lvb_size.attr,
 252         &lockstruct_attr_flags.attr,
 253         NULL
 254 };
 255
 256 /*
 257  * display struct gfs2_args fields
 258  */
 259
 260 struct args_attr {
 261         struct attribute attr;
 262         ssize_t (*show)(struct gfs2_sbd *, char *);
 263 };
 264
 265 #define ARGS_ATTR(name, fmt)                                                \
 266 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 267 {                                                                           \
 268         return sprintf(buf, fmt, sdp->sd_args.ar_##name);                   \
 269 }                                                                           \
 270 static struct args_attr args_attr_##name = __ATTR_RO(name)
 271
 272 ARGS_ATTR(lockproto,       "%s\n");
 273 ARGS_ATTR(locktable,       "%s\n");
 274 ARGS_ATTR(hostdata,        "%s\n");
 275 ARGS_ATTR(spectator,       "%d\n");
 276 ARGS_ATTR(ignore_local_fs, "%d\n");
 277 ARGS_ATTR(localcaching,    "%d\n");
 278 ARGS_ATTR(localflocks,     "%d\n");
 279 ARGS_ATTR(debug,           "%d\n");
 280 ARGS_ATTR(upgrade,         "%d\n");
 281 ARGS_ATTR(num_glockd,      "%u\n");
 282 ARGS_ATTR(posix_acl,       "%d\n");
 283 ARGS_ATTR(quota,           "%u\n");
 284 ARGS_ATTR(suiddir,         "%d\n");
 285 ARGS_ATTR(data,            "%d\n");
 286
 287 /* one oddball doesn't fit the macro mold */
 288 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
 289 {
 290         return sprintf(buf, "%d\n", !!test_bit(SDF_NOATIME, &sdp->sd_flags));
 291 }
 292 static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
 293
 294 static struct attribute *args_attrs[] = {
 295         &args_attr_lockproto.attr,
 296         &args_attr_locktable.attr,
 297         &args_attr_hostdata.attr,
 298         &args_attr_spectator.attr,
 299         &args_attr_ignore_local_fs.attr,
 300         &args_attr_localcaching.attr,
 301         &args_attr_localflocks.attr,
 302         &args_attr_debug.attr,
 303         &args_attr_upgrade.attr,
 304         &args_attr_num_glockd.attr,
 305         &args_attr_posix_acl.attr,
 306         &args_attr_quota.attr,
 307         &args_attr_suiddir.attr,
 308         &args_attr_data.attr,
 309         &args_attr_noatime.attr,
 310         NULL
 311 };
 312
 313 /*
 314  * display counters from superblock
 315  */
 316
 317 struct counters_attr {
 318         struct attribute attr;
 319         ssize_t (*show)(struct gfs2_sbd *, char *);
 320 };
 321
 322 #define COUNTERS_ATTR(name, fmt)                                            \
 323 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 324 {                                                                           \
 325         return sprintf(buf, fmt, (unsigned int)atomic_read(&sdp->sd_##name)); \
 326 }                                                                           \
 327 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
 328
 329 COUNTERS_ATTR(glock_count,      "%u\n");
 330 COUNTERS_ATTR(glock_held_count, "%u\n");
 331 COUNTERS_ATTR(inode_count,      "%u\n");
 332 COUNTERS_ATTR(reclaimed,        "%u\n");
 333
 334 static struct attribute *counters_attrs[] = {
 335         &counters_attr_glock_count.attr,
 336         &counters_attr_glock_held_count.attr,
 337         &counters_attr_inode_count.attr,
 338         &counters_attr_reclaimed.attr,
 339         NULL
 340 };
 341
 342 /*
 343  * get and set struct gfs2_tune fields
 344  */
 345
 346 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 347 {
 348         return sprintf(buf, "%u %u\n", sdp->sd_tune.gt_quota_scale_num,
 349                                        sdp->sd_tune.gt_quota_scale_den);
 350 }
 351
 352 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 353                                  size_t len)
 354 {
 355         struct gfs2_tune *gt = &sdp->sd_tune;
 356         unsigned int x, y;
 357
 358         if (!capable(CAP_SYS_ADMIN))
 359                 return -EACCES;
 360
 361         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 362                 return -EINVAL;
 363
 364         spin_lock(&gt->gt_spin);
 365         gt->gt_quota_scale_num = x;
 366         gt->gt_quota_scale_den = y;
 367         spin_unlock(&gt->gt_spin);
 368         return len;
 369 }
 370
 371 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 372                         int check_zero, const char *buf, size_t len)
 373 {
 374         struct gfs2_tune *gt = &sdp->sd_tune;
 375         unsigned int x;
 376
 377         if (!capable(CAP_SYS_ADMIN))
 378                 return -EACCES;
 379
 380         x = simple_strtoul(buf, NULL, 0);
 381
 382         if (check_zero && !x)
 383                 return -EINVAL;
 384
 385         spin_lock(&gt->gt_spin);
 386         *field = x;
 387         spin_unlock(&gt->gt_spin);
 388         return len;
 389 }
 390
 391 struct tune_attr {
 392         struct attribute attr;
 393         ssize_t (*show)(struct gfs2_sbd *, char *);
 394         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 395 };
 396
 397 #define TUNE_ATTR_3(name, show, store)                                        \
 398 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 399
 400 #define TUNE_ATTR_2(name, store)                                              \
 401 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 402 {                                                                             \
 403         return sprintf(buf, "%u\n", sdp->sd_tune.gt_##name);                  \
 404 }                                                                             \
 405 TUNE_ATTR_3(name, name##_show, store)
 406
 407 #define TUNE_ATTR(name, check_zero)                                           \
 408 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 409 {                                                                             \
 410         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 411 }                                                                             \
 412 TUNE_ATTR_2(name, name##_store)
 413
 414 #define TUNE_ATTR_DAEMON(name, process)                                       \
 415 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 416 {                                                                             \
 417         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
 418         wake_up_process(sdp->sd_##process);                                   \
 419         return r;                                                             \
 420 }                                                                             \
 421 TUNE_ATTR_2(name, name##_store)
 422
 423 TUNE_ATTR(ilimit, 0);
 424 TUNE_ATTR(ilimit_tries, 0);
 425 TUNE_ATTR(ilimit_min, 0);
 426 TUNE_ATTR(demote_secs, 0);
 427 TUNE_ATTR(incore_log_blocks, 0);
 428 TUNE_ATTR(log_flush_secs, 0);
 429 TUNE_ATTR(jindex_refresh_secs, 0);
 430 TUNE_ATTR(quota_warn_period, 0);
 431 TUNE_ATTR(quota_quantum, 0);
 432 TUNE_ATTR(atime_quantum, 0);
 433 TUNE_ATTR(max_readahead, 0);
 434 TUNE_ATTR(complain_secs, 0);
 435 TUNE_ATTR(reclaim_limit, 0);
 436 TUNE_ATTR(prefetch_secs, 0);
 437 TUNE_ATTR(statfs_slow, 0);
 438 TUNE_ATTR(new_files_jdata, 0);
 439 TUNE_ATTR(new_files_directio, 0);
 440 TUNE_ATTR(quota_simul_sync, 1);
 441 TUNE_ATTR(quota_cache_secs, 1);
 442 TUNE_ATTR(max_atomic_write, 1);
 443 TUNE_ATTR(stall_secs, 1);
 444 TUNE_ATTR(entries_per_readdir, 1);
 445 TUNE_ATTR(greedy_default, 1);
 446 TUNE_ATTR(greedy_quantum, 1);
 447 TUNE_ATTR(greedy_max, 1);
 448 TUNE_ATTR(statfs_quantum, 1);
 449 TUNE_ATTR_DAEMON(scand_secs, scand_process);
 450 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
 451 TUNE_ATTR_DAEMON(logd_secs, logd_process);
 452 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
 453 TUNE_ATTR_DAEMON(inoded_secs, inoded_process);
 454 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 455
 456 static struct attribute *tune_attrs[] = {
 457         &tune_attr_ilimit.attr,
 458         &tune_attr_ilimit_tries.attr,
 459         &tune_attr_ilimit_min.attr,
 460         &tune_attr_demote_secs.attr,
 461         &tune_attr_incore_log_blocks.attr,
 462         &tune_attr_log_flush_secs.attr,
 463         &tune_attr_jindex_refresh_secs.attr,
 464         &tune_attr_quota_warn_period.attr,
 465         &tune_attr_quota_quantum.attr,
 466         &tune_attr_atime_quantum.attr,
 467         &tune_attr_max_readahead.attr,
 468         &tune_attr_complain_secs.attr,
 469         &tune_attr_reclaim_limit.attr,
 470         &tune_attr_prefetch_secs.attr,
 471         &tune_attr_statfs_slow.attr,
 472         &tune_attr_quota_simul_sync.attr,
 473         &tune_attr_quota_cache_secs.attr,
 474         &tune_attr_max_atomic_write.attr,
 475         &tune_attr_stall_secs.attr,
 476         &tune_attr_entries_per_readdir.attr,
 477         &tune_attr_greedy_default.attr,
 478         &tune_attr_greedy_quantum.attr,
 479         &tune_attr_greedy_max.attr,
 480         &tune_attr_statfs_quantum.attr,
 481         &tune_attr_scand_secs.attr,
 482         &tune_attr_recoverd_secs.attr,
 483         &tune_attr_logd_secs.attr,
 484         &tune_attr_quotad_secs.attr,
 485         &tune_attr_inoded_secs.attr,
 486         &tune_attr_quota_scale.attr,
 487         &tune_attr_new_files_jdata.attr,
 488         &tune_attr_new_files_directio.attr,
 489         NULL
 490 };
 491
 492 static struct attribute_group lockstruct_group = {
 493         .name = "lockstruct",
 494         .attrs = lockstruct_attrs
 495 };
 496
 497 static struct attribute_group counters_group = {
 498         .name = "counters",
 499         .attrs = counters_attrs
 500 };
 501
 502 static struct attribute_group args_group = {
 503         .name = "args",
 504         .attrs = args_attrs
 505 };
 506
 507 static struct attribute_group tune_group = {
 508         .name = "tune",
 509         .attrs = tune_attrs
 510 };
 511
 512 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 513 {
 514         int error;
 515
 516         sdp->sd_kobj.kset = &gfs2_kset;
 517         sdp->sd_kobj.ktype = &gfs2_ktype;
 518
 519         error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);
 520         if (error)
 521                 goto fail;
 522
 523         error = kobject_register(&sdp->sd_kobj);
 524         if (error)
 525                 goto fail;
 526
 527         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
 528         if (error)
 529                 goto fail_reg;
 530
 531         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
 532         if (error)
 533                 goto fail_lockstruct;
 534
 535         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
 536         if (error)
 537                 goto fail_counters;
 538
 539         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 540         if (error)
 541                 goto fail_args;
 542
 543         return 0;
 544
 545  fail_args:
 546         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 547  fail_counters:
 548         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 549  fail_lockstruct:
 550         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 551  fail_reg:
 552         kobject_unregister(&sdp->sd_kobj);
 553  fail:
 554         return error;
 555 }
 556
 557 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 558 {
 559         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 560         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 561         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 562         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 563         kobject_unregister(&sdp->sd_kobj);
 564 }
 565
 566 int gfs2_sys_init(void)
 567 {
 568         gfs2_sys_margs = NULL;
 569         spin_lock_init(&gfs2_sys_margs_lock);
 570         return kset_register(&gfs2_kset);
 571 }
 572
 573 void gfs2_sys_uninit(void)
 574 {
 575         kfree(gfs2_sys_margs);
 576         kset_unregister(&gfs2_kset);
 577 }
 578