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 <linux/gfs2_ondisk.h>
  18 #include <asm/semaphore.h>
  19 #include <asm/uaccess.h>
  20
  21 #include "gfs2.h"
  22 #include "lm_interface.h"
  23 #include "incore.h"
  24 #include "lm.h"
  25 #include "sys.h"
  26 #include "super.h"
  27 #include "glock.h"
  28 #include "quota.h"
  29 #include "util.h"
  30
  31 char *gfs2_sys_margs;
  32 spinlock_t gfs2_sys_margs_lock;
  33
  34 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  35 {
  36         return sprintf(buf, "%s\n", sdp->sd_vfs->s_id);
  37 }
  38
  39 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  40 {
  41         return sprintf(buf, "%s\n", sdp->sd_fsname);
  42 }
  43
  44 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  45 {
  46         unsigned int count;
  47
  48         mutex_lock(&sdp->sd_freeze_lock);
  49         count = sdp->sd_freeze_count;
  50         mutex_unlock(&sdp->sd_freeze_lock);
  51
  52         return sprintf(buf, "%u\n", count);
  53 }
  54
  55 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  56 {
  57         ssize_t ret = len;
  58         int error = 0;
  59         int n = simple_strtol(buf, NULL, 0);
  60
  61         if (!capable(CAP_SYS_ADMIN))
  62                 return -EACCES;
  63
  64         switch (n) {
  65         case 0:
  66                 gfs2_unfreeze_fs(sdp);
  67                 break;
  68         case 1:
  69                 error = gfs2_freeze_fs(sdp);
  70                 break;
  71         default:
  72                 ret = -EINVAL;
  73         }
  74
  75         if (error)
  76                 fs_warn(sdp, "freeze %d error %d", n, error);
  77
  78         return ret;
  79 }
  80
  81 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
  82 {
  83         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
  84         return sprintf(buf, "%u\n", b);
  85 }
  86
  87 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  88 {
  89         if (!capable(CAP_SYS_ADMIN))
  90                 return -EACCES;
  91
  92         if (simple_strtol(buf, NULL, 0) != 1)
  93                 return -EINVAL;
  94
  95         gfs2_lm_withdraw(sdp,
  96                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
  97                 sdp->sd_fsname);
  98         return len;
  99 }
 100
 101 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 102                                  size_t len)
 103 {
 104         if (!capable(CAP_SYS_ADMIN))
 105                 return -EACCES;
 106
 107         if (simple_strtol(buf, NULL, 0) != 1)
 108                 return -EINVAL;
 109
 110         gfs2_statfs_sync(sdp);
 111         return len;
 112 }
 113
 114 static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 115 {
 116         if (!capable(CAP_SYS_ADMIN))
 117                 return -EACCES;
 118
 119         if (simple_strtol(buf, NULL, 0) != 1)
 120                 return -EINVAL;
 121
 122         gfs2_gl_hash_clear(sdp, NO_WAIT);
 123         return len;
 124 }
 125
 126 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 127                                 size_t len)
 128 {
 129         if (!capable(CAP_SYS_ADMIN))
 130                 return -EACCES;
 131
 132         if (simple_strtol(buf, NULL, 0) != 1)
 133                 return -EINVAL;
 134
 135         gfs2_quota_sync(sdp);
 136         return len;
 137 }
 138
 139 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 140                                         size_t len)
 141 {
 142         uint32_t id;
 143
 144         if (!capable(CAP_SYS_ADMIN))
 145                 return -EACCES;
 146
 147         id = simple_strtoul(buf, NULL, 0);
 148
 149         gfs2_quota_refresh(sdp, 1, id);
 150         return len;
 151 }
 152
 153 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 154                                          size_t len)
 155 {
 156         uint32_t id;
 157
 158         if (!capable(CAP_SYS_ADMIN))
 159                 return -EACCES;
 160
 161         id = simple_strtoul(buf, NULL, 0);
 162
 163         gfs2_quota_refresh(sdp, 0, id);
 164         return len;
 165 }
 166
 167 struct gfs2_attr {
 168         struct attribute attr;
 169         ssize_t (*show)(struct gfs2_sbd *, char *);
 170         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 171 };
 172
 173 #define GFS2_ATTR(name, mode, show, store) \
 174 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 175
 176 GFS2_ATTR(id,                  0444, id_show,       NULL);
 177 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 178 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 179 GFS2_ATTR(shrink,              0200, NULL,          shrink_store);
 180 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 181 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 182 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 183 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 184 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 185
 186 static struct attribute *gfs2_attrs[] = {
 187         &gfs2_attr_id.attr,
 188         &gfs2_attr_fsname.attr,
 189         &gfs2_attr_freeze.attr,
 190         &gfs2_attr_shrink.attr,
 191         &gfs2_attr_withdraw.attr,
 192         &gfs2_attr_statfs_sync.attr,
 193         &gfs2_attr_quota_sync.attr,
 194         &gfs2_attr_quota_refresh_user.attr,
 195         &gfs2_attr_quota_refresh_group.attr,
 196         NULL,
 197 };
 198
 199 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
 200                               char *buf)
 201 {
 202         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 203         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 204         return a->show ? a->show(sdp, buf) : 0;
 205 }
 206
 207 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
 208                                const char *buf, size_t len)
 209 {
 210         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 211         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 212         return a->store ? a->store(sdp, buf, len) : len;
 213 }
 214
 215 static struct sysfs_ops gfs2_attr_ops = {
 216         .show  = gfs2_attr_show,
 217         .store = gfs2_attr_store,
 218 };
 219
 220 static struct kobj_type gfs2_ktype = {
 221         .default_attrs = gfs2_attrs,
 222         .sysfs_ops     = &gfs2_attr_ops,
 223 };
 224
 225 static struct kset gfs2_kset = {
 226         .subsys = &fs_subsys,
 227         .kobj   = {.name = "gfs2",},
 228         .ktype  = &gfs2_ktype,
 229 };
 230
 231 /*
 232  * display struct lm_lockstruct fields
 233  */
 234
 235 struct lockstruct_attr {
 236         struct attribute attr;
 237         ssize_t (*show)(struct gfs2_sbd *, char *);
 238 };
 239
 240 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
 241 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 242 {                                                                           \
 243         return sprintf(buf, fmt, sdp->sd_lockstruct.ls_##name);             \
 244 }                                                                           \
 245 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
 246
 247 LOCKSTRUCT_ATTR(jid,      "%u\n");
 248 LOCKSTRUCT_ATTR(first,    "%u\n");
 249 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
 250 LOCKSTRUCT_ATTR(flags,    "%d\n");
 251
 252 static struct attribute *lockstruct_attrs[] = {
 253         &lockstruct_attr_jid.attr,
 254         &lockstruct_attr_first.attr,
 255         &lockstruct_attr_lvb_size.attr,
 256         &lockstruct_attr_flags.attr,
 257         NULL
 258 };
 259
 260 /*
 261  * display struct gfs2_args fields
 262  */
 263
 264 struct args_attr {
 265         struct attribute attr;
 266         ssize_t (*show)(struct gfs2_sbd *, char *);
 267 };
 268
 269 #define ARGS_ATTR(name, fmt)                                                \
 270 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 271 {                                                                           \
 272         return sprintf(buf, fmt, sdp->sd_args.ar_##name);                   \
 273 }                                                                           \
 274 static struct args_attr args_attr_##name = __ATTR_RO(name)
 275
 276 ARGS_ATTR(lockproto,       "%s\n");
 277 ARGS_ATTR(locktable,       "%s\n");
 278 ARGS_ATTR(hostdata,        "%s\n");
 279 ARGS_ATTR(spectator,       "%d\n");
 280 ARGS_ATTR(ignore_local_fs, "%d\n");
 281 ARGS_ATTR(localcaching,    "%d\n");
 282 ARGS_ATTR(localflocks,     "%d\n");
 283 ARGS_ATTR(debug,           "%d\n");
 284 ARGS_ATTR(upgrade,         "%d\n");
 285 ARGS_ATTR(num_glockd,      "%u\n");
 286 ARGS_ATTR(posix_acl,       "%d\n");
 287 ARGS_ATTR(quota,           "%u\n");
 288 ARGS_ATTR(suiddir,         "%d\n");
 289 ARGS_ATTR(data,            "%d\n");
 290
 291 /* one oddball doesn't fit the macro mold */
 292 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
 293 {
 294         return sprintf(buf, "%d\n", !!test_bit(SDF_NOATIME, &sdp->sd_flags));
 295 }
 296 static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
 297
 298 static struct attribute *args_attrs[] = {
 299         &args_attr_lockproto.attr,
 300         &args_attr_locktable.attr,
 301         &args_attr_hostdata.attr,
 302         &args_attr_spectator.attr,
 303         &args_attr_ignore_local_fs.attr,
 304         &args_attr_localcaching.attr,
 305         &args_attr_localflocks.attr,
 306         &args_attr_debug.attr,
 307         &args_attr_upgrade.attr,
 308         &args_attr_num_glockd.attr,
 309         &args_attr_posix_acl.attr,
 310         &args_attr_quota.attr,
 311         &args_attr_suiddir.attr,
 312         &args_attr_data.attr,
 313         &args_attr_noatime.attr,
 314         NULL
 315 };
 316
 317 /*
 318  * display counters from superblock
 319  */
 320
 321 struct counters_attr {
 322         struct attribute attr;
 323         ssize_t (*show)(struct gfs2_sbd *, char *);
 324 };
 325
 326 #define COUNTERS_ATTR(name, fmt)                                            \
 327 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 328 {                                                                           \
 329         return sprintf(buf, fmt, (unsigned int)atomic_read(&sdp->sd_##name)); \
 330 }                                                                           \
 331 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
 332
 333 COUNTERS_ATTR(glock_count,      "%u\n");
 334 COUNTERS_ATTR(glock_held_count, "%u\n");
 335 COUNTERS_ATTR(inode_count,      "%u\n");
 336 COUNTERS_ATTR(reclaimed,        "%u\n");
 337
 338 static struct attribute *counters_attrs[] = {
 339         &counters_attr_glock_count.attr,
 340         &counters_attr_glock_held_count.attr,
 341         &counters_attr_inode_count.attr,
 342         &counters_attr_reclaimed.attr,
 343         NULL
 344 };
 345
 346 /*
 347  * get and set struct gfs2_tune fields
 348  */
 349
 350 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 351 {
 352         return sprintf(buf, "%u %u\n", sdp->sd_tune.gt_quota_scale_num,
 353                                        sdp->sd_tune.gt_quota_scale_den);
 354 }
 355
 356 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 357                                  size_t len)
 358 {
 359         struct gfs2_tune *gt = &sdp->sd_tune;
 360         unsigned int x, y;
 361
 362         if (!capable(CAP_SYS_ADMIN))
 363                 return -EACCES;
 364
 365         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 366                 return -EINVAL;
 367
 368         spin_lock(&gt->gt_spin);
 369         gt->gt_quota_scale_num = x;
 370         gt->gt_quota_scale_den = y;
 371         spin_unlock(&gt->gt_spin);
 372         return len;
 373 }
 374
 375 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 376                         int check_zero, const char *buf, size_t len)
 377 {
 378         struct gfs2_tune *gt = &sdp->sd_tune;
 379         unsigned int x;
 380
 381         if (!capable(CAP_SYS_ADMIN))
 382                 return -EACCES;
 383
 384         x = simple_strtoul(buf, NULL, 0);
 385
 386         if (check_zero && !x)
 387                 return -EINVAL;
 388
 389         spin_lock(&gt->gt_spin);
 390         *field = x;
 391         spin_unlock(&gt->gt_spin);
 392         return len;
 393 }
 394
 395 struct tune_attr {
 396         struct attribute attr;
 397         ssize_t (*show)(struct gfs2_sbd *, char *);
 398         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 399 };
 400
 401 #define TUNE_ATTR_3(name, show, store)                                        \
 402 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 403
 404 #define TUNE_ATTR_2(name, store)                                              \
 405 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 406 {                                                                             \
 407         return sprintf(buf, "%u\n", sdp->sd_tune.gt_##name);                  \
 408 }                                                                             \
 409 TUNE_ATTR_3(name, name##_show, store)
 410
 411 #define TUNE_ATTR(name, check_zero)                                           \
 412 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 413 {                                                                             \
 414         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 415 }                                                                             \
 416 TUNE_ATTR_2(name, name##_store)
 417
 418 #define TUNE_ATTR_DAEMON(name, process)                                       \
 419 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 420 {                                                                             \
 421         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
 422         wake_up_process(sdp->sd_##process);                                   \
 423         return r;                                                             \
 424 }                                                                             \
 425 TUNE_ATTR_2(name, name##_store)
 426
 427 TUNE_ATTR(ilimit, 0);
 428 TUNE_ATTR(ilimit_tries, 0);
 429 TUNE_ATTR(ilimit_min, 0);
 430 TUNE_ATTR(demote_secs, 0);
 431 TUNE_ATTR(incore_log_blocks, 0);
 432 TUNE_ATTR(log_flush_secs, 0);
 433 TUNE_ATTR(jindex_refresh_secs, 0);
 434 TUNE_ATTR(quota_warn_period, 0);
 435 TUNE_ATTR(quota_quantum, 0);
 436 TUNE_ATTR(atime_quantum, 0);
 437 TUNE_ATTR(max_readahead, 0);
 438 TUNE_ATTR(complain_secs, 0);
 439 TUNE_ATTR(reclaim_limit, 0);
 440 TUNE_ATTR(prefetch_secs, 0);
 441 TUNE_ATTR(statfs_slow, 0);
 442 TUNE_ATTR(new_files_jdata, 0);
 443 TUNE_ATTR(new_files_directio, 0);
 444 TUNE_ATTR(quota_simul_sync, 1);
 445 TUNE_ATTR(quota_cache_secs, 1);
 446 TUNE_ATTR(max_atomic_write, 1);
 447 TUNE_ATTR(stall_secs, 1);
 448 TUNE_ATTR(entries_per_readdir, 1);
 449 TUNE_ATTR(greedy_default, 1);
 450 TUNE_ATTR(greedy_quantum, 1);
 451 TUNE_ATTR(greedy_max, 1);
 452 TUNE_ATTR(statfs_quantum, 1);
 453 TUNE_ATTR_DAEMON(scand_secs, scand_process);
 454 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
 455 TUNE_ATTR_DAEMON(logd_secs, logd_process);
 456 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
 457 TUNE_ATTR_DAEMON(inoded_secs, inoded_process);
 458 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 459
 460 static struct attribute *tune_attrs[] = {
 461         &tune_attr_ilimit.attr,
 462         &tune_attr_ilimit_tries.attr,
 463         &tune_attr_ilimit_min.attr,
 464         &tune_attr_demote_secs.attr,
 465         &tune_attr_incore_log_blocks.attr,
 466         &tune_attr_log_flush_secs.attr,
 467         &tune_attr_jindex_refresh_secs.attr,
 468         &tune_attr_quota_warn_period.attr,
 469         &tune_attr_quota_quantum.attr,
 470         &tune_attr_atime_quantum.attr,
 471         &tune_attr_max_readahead.attr,
 472         &tune_attr_complain_secs.attr,
 473         &tune_attr_reclaim_limit.attr,
 474         &tune_attr_prefetch_secs.attr,
 475         &tune_attr_statfs_slow.attr,
 476         &tune_attr_quota_simul_sync.attr,
 477         &tune_attr_quota_cache_secs.attr,
 478         &tune_attr_max_atomic_write.attr,
 479         &tune_attr_stall_secs.attr,
 480         &tune_attr_entries_per_readdir.attr,
 481         &tune_attr_greedy_default.attr,
 482         &tune_attr_greedy_quantum.attr,
 483         &tune_attr_greedy_max.attr,
 484         &tune_attr_statfs_quantum.attr,
 485         &tune_attr_scand_secs.attr,
 486         &tune_attr_recoverd_secs.attr,
 487         &tune_attr_logd_secs.attr,
 488         &tune_attr_quotad_secs.attr,
 489         &tune_attr_inoded_secs.attr,
 490         &tune_attr_quota_scale.attr,
 491         &tune_attr_new_files_jdata.attr,
 492         &tune_attr_new_files_directio.attr,
 493         NULL
 494 };
 495
 496 static struct attribute_group lockstruct_group = {
 497         .name = "lockstruct",
 498         .attrs = lockstruct_attrs
 499 };
 500
 501 static struct attribute_group counters_group = {
 502         .name = "counters",
 503         .attrs = counters_attrs
 504 };
 505
 506 static struct attribute_group args_group = {
 507         .name = "args",
 508         .attrs = args_attrs
 509 };
 510
 511 static struct attribute_group tune_group = {
 512         .name = "tune",
 513         .attrs = tune_attrs
 514 };
 515
 516 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 517 {
 518         int error;
 519
 520         sdp->sd_kobj.kset = &gfs2_kset;
 521         sdp->sd_kobj.ktype = &gfs2_ktype;
 522
 523         error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);
 524         if (error)
 525                 goto fail;
 526
 527         error = kobject_register(&sdp->sd_kobj);
 528         if (error)
 529                 goto fail;
 530
 531         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
 532         if (error)
 533                 goto fail_reg;
 534
 535         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
 536         if (error)
 537                 goto fail_lockstruct;
 538
 539         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
 540         if (error)
 541                 goto fail_counters;
 542
 543         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 544         if (error)
 545                 goto fail_args;
 546
 547         return 0;
 548
 549  fail_args:
 550         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 551  fail_counters:
 552         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 553  fail_lockstruct:
 554         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 555  fail_reg:
 556         kobject_unregister(&sdp->sd_kobj);
 557  fail:
 558         return error;
 559 }
 560
 561 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 562 {
 563         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 564         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 565         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 566         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 567         kobject_unregister(&sdp->sd_kobj);
 568 }
 569
 570 int gfs2_sys_init(void)
 571 {
 572         gfs2_sys_margs = NULL;
 573         spin_lock_init(&gfs2_sys_margs_lock);
 574         return kset_register(&gfs2_kset);
 575 }
 576
 577 void gfs2_sys_uninit(void)
 578 {
 579         kfree(gfs2_sys_margs);
 580         kset_unregister(&gfs2_kset);
 581 }
 582