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 <linux/gfs2_ondisk.h>
  18 #include <linux/lm_interface.h>
  19 #include <asm/uaccess.h>
  20
  21 #include "gfs2.h"
  22 #include "incore.h"
  23 #include "lm.h"
  24 #include "sys.h"
  25 #include "super.h"
  26 #include "glock.h"
  27 #include "quota.h"
  28 #include "util.h"
  29
  30 char *gfs2_sys_margs;
  31 spinlock_t gfs2_sys_margs_lock;
  32
  33 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  34 {
  35         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_vfs->s_id);
  36 }
  37
  38 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  39 {
  40         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
  41 }
  42
  43 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  44 {
  45         unsigned int count;
  46
  47         mutex_lock(&sdp->sd_freeze_lock);
  48         count = sdp->sd_freeze_count;
  49         mutex_unlock(&sdp->sd_freeze_lock);
  50
  51         return snprintf(buf, PAGE_SIZE, "%u\n", count);
  52 }
  53
  54 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  55 {
  56         ssize_t ret = len;
  57         int error = 0;
  58         int n = simple_strtol(buf, NULL, 0);
  59
  60         if (!capable(CAP_SYS_ADMIN))
  61                 return -EACCES;
  62
  63         switch (n) {
  64         case 0:
  65                 gfs2_unfreeze_fs(sdp);
  66                 break;
  67         case 1:
  68                 error = gfs2_freeze_fs(sdp);
  69                 break;
  70         default:
  71                 ret = -EINVAL;
  72         }
  73
  74         if (error)
  75                 fs_warn(sdp, "freeze %d error %d", n, error);
  76
  77         return ret;
  78 }
  79
  80 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
  81 {
  82         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
  83         return snprintf(buf, PAGE_SIZE, "%u\n", b);
  84 }
  85
  86 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  87 {
  88         if (!capable(CAP_SYS_ADMIN))
  89                 return -EACCES;
  90
  91         if (simple_strtol(buf, NULL, 0) != 1)
  92                 return -EINVAL;
  93
  94         gfs2_lm_withdraw(sdp,
  95                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
  96                 sdp->sd_fsname);
  97         return len;
  98 }
  99
 100 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
 101                                  size_t len)
 102 {
 103         if (!capable(CAP_SYS_ADMIN))
 104                 return -EACCES;
 105
 106         if (simple_strtol(buf, NULL, 0) != 1)
 107                 return -EINVAL;
 108
 109         gfs2_statfs_sync(sdp);
 110         return len;
 111 }
 112
 113 static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
 114 {
 115         if (!capable(CAP_SYS_ADMIN))
 116                 return -EACCES;
 117
 118         if (simple_strtol(buf, NULL, 0) != 1)
 119                 return -EINVAL;
 120
 121         gfs2_gl_hash_clear(sdp, NO_WAIT);
 122         return len;
 123 }
 124
 125 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 126                                 size_t len)
 127 {
 128         if (!capable(CAP_SYS_ADMIN))
 129                 return -EACCES;
 130
 131         if (simple_strtol(buf, NULL, 0) != 1)
 132                 return -EINVAL;
 133
 134         gfs2_quota_sync(sdp);
 135         return len;
 136 }
 137
 138 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 139                                         size_t len)
 140 {
 141         u32 id;
 142
 143         if (!capable(CAP_SYS_ADMIN))
 144                 return -EACCES;
 145
 146         id = simple_strtoul(buf, NULL, 0);
 147
 148         gfs2_quota_refresh(sdp, 1, id);
 149         return len;
 150 }
 151
 152 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 153                                          size_t len)
 154 {
 155         u32 id;
 156
 157         if (!capable(CAP_SYS_ADMIN))
 158                 return -EACCES;
 159
 160         id = simple_strtoul(buf, NULL, 0);
 161
 162         gfs2_quota_refresh(sdp, 0, id);
 163         return len;
 164 }
 165
 166 struct gfs2_attr {
 167         struct attribute attr;
 168         ssize_t (*show)(struct gfs2_sbd *, char *);
 169         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 170 };
 171
 172 #define GFS2_ATTR(name, mode, show, store) \
 173 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 174
 175 GFS2_ATTR(id,                  0444, id_show,       NULL);
 176 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 177 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 178 GFS2_ATTR(shrink,              0200, NULL,          shrink_store);
 179 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 180 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 181 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 182 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 183 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 184
 185 static struct attribute *gfs2_attrs[] = {
 186         &gfs2_attr_id.attr,
 187         &gfs2_attr_fsname.attr,
 188         &gfs2_attr_freeze.attr,
 189         &gfs2_attr_shrink.attr,
 190         &gfs2_attr_withdraw.attr,
 191         &gfs2_attr_statfs_sync.attr,
 192         &gfs2_attr_quota_sync.attr,
 193         &gfs2_attr_quota_refresh_user.attr,
 194         &gfs2_attr_quota_refresh_group.attr,
 195         NULL,
 196 };
 197
 198 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
 199                               char *buf)
 200 {
 201         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 202         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 203         return a->show ? a->show(sdp, buf) : 0;
 204 }
 205
 206 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
 207                                const char *buf, size_t len)
 208 {
 209         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 210         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 211         return a->store ? a->store(sdp, buf, len) : len;
 212 }
 213
 214 static struct sysfs_ops gfs2_attr_ops = {
 215         .show  = gfs2_attr_show,
 216         .store = gfs2_attr_store,
 217 };
 218
 219 static struct kobj_type gfs2_ktype = {
 220         .default_attrs = gfs2_attrs,
 221         .sysfs_ops     = &gfs2_attr_ops,
 222 };
 223
 224 static struct kset gfs2_kset = {
 225         .subsys = &fs_subsys,
 226         .kobj   = {.name = "gfs2"},
 227         .ktype  = &gfs2_ktype,
 228 };
 229
 230 /*
 231  * display struct lm_lockstruct fields
 232  */
 233
 234 struct lockstruct_attr {
 235         struct attribute attr;
 236         ssize_t (*show)(struct gfs2_sbd *, char *);
 237 };
 238
 239 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
 240 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 241 {                                                                           \
 242         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
 243 }                                                                           \
 244 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
 245
 246 LOCKSTRUCT_ATTR(jid,      "%u\n");
 247 LOCKSTRUCT_ATTR(first,    "%u\n");
 248 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
 249 LOCKSTRUCT_ATTR(flags,    "%d\n");
 250
 251 static struct attribute *lockstruct_attrs[] = {
 252         &lockstruct_attr_jid.attr,
 253         &lockstruct_attr_first.attr,
 254         &lockstruct_attr_lvb_size.attr,
 255         &lockstruct_attr_flags.attr,
 256         NULL,
 257 };
 258
 259 /*
 260  * display struct gfs2_args fields
 261  */
 262
 263 struct args_attr {
 264         struct attribute attr;
 265         ssize_t (*show)(struct gfs2_sbd *, char *);
 266 };
 267
 268 #define ARGS_ATTR(name, fmt)                                                \
 269 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 270 {                                                                           \
 271         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
 272 }                                                                           \
 273 static struct args_attr args_attr_##name = __ATTR_RO(name)
 274
 275 ARGS_ATTR(lockproto,       "%s\n");
 276 ARGS_ATTR(locktable,       "%s\n");
 277 ARGS_ATTR(hostdata,        "%s\n");
 278 ARGS_ATTR(spectator,       "%d\n");
 279 ARGS_ATTR(ignore_local_fs, "%d\n");
 280 ARGS_ATTR(localcaching,    "%d\n");
 281 ARGS_ATTR(localflocks,     "%d\n");
 282 ARGS_ATTR(debug,           "%d\n");
 283 ARGS_ATTR(upgrade,         "%d\n");
 284 ARGS_ATTR(num_glockd,      "%u\n");
 285 ARGS_ATTR(posix_acl,       "%d\n");
 286 ARGS_ATTR(quota,           "%u\n");
 287 ARGS_ATTR(suiddir,         "%d\n");
 288 ARGS_ATTR(data,            "%d\n");
 289
 290 /* one oddball doesn't fit the macro mold */
 291 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
 292 {
 293         return snprintf(buf, PAGE_SIZE, "%d\n",
 294                         !!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 snprintf(buf, PAGE_SIZE, fmt,                                \
 330                         (unsigned int)atomic_read(&sdp->sd_##name));        \
 331 }                                                                           \
 332 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
 333
 334 COUNTERS_ATTR(glock_count,      "%u\n");
 335 COUNTERS_ATTR(glock_held_count, "%u\n");
 336 COUNTERS_ATTR(inode_count,      "%u\n");
 337 COUNTERS_ATTR(reclaimed,        "%u\n");
 338
 339 static struct attribute *counters_attrs[] = {
 340         &counters_attr_glock_count.attr,
 341         &counters_attr_glock_held_count.attr,
 342         &counters_attr_inode_count.attr,
 343         &counters_attr_reclaimed.attr,
 344         NULL,
 345 };
 346
 347 /*
 348  * get and set struct gfs2_tune fields
 349  */
 350
 351 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 352 {
 353         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 354                         sdp->sd_tune.gt_quota_scale_num,
 355                         sdp->sd_tune.gt_quota_scale_den);
 356 }
 357
 358 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 359                                  size_t len)
 360 {
 361         struct gfs2_tune *gt = &sdp->sd_tune;
 362         unsigned int x, y;
 363
 364         if (!capable(CAP_SYS_ADMIN))
 365                 return -EACCES;
 366
 367         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 368                 return -EINVAL;
 369
 370         spin_lock(&gt->gt_spin);
 371         gt->gt_quota_scale_num = x;
 372         gt->gt_quota_scale_den = y;
 373         spin_unlock(&gt->gt_spin);
 374         return len;
 375 }
 376
 377 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 378                         int check_zero, const char *buf, size_t len)
 379 {
 380         struct gfs2_tune *gt = &sdp->sd_tune;
 381         unsigned int x;
 382
 383         if (!capable(CAP_SYS_ADMIN))
 384                 return -EACCES;
 385
 386         x = simple_strtoul(buf, NULL, 0);
 387
 388         if (check_zero && !x)
 389                 return -EINVAL;
 390
 391         spin_lock(&gt->gt_spin);
 392         *field = x;
 393         spin_unlock(&gt->gt_spin);
 394         return len;
 395 }
 396
 397 struct tune_attr {
 398         struct attribute attr;
 399         ssize_t (*show)(struct gfs2_sbd *, char *);
 400         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 401 };
 402
 403 #define TUNE_ATTR_3(name, show, store)                                        \
 404 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 405
 406 #define TUNE_ATTR_2(name, store)                                              \
 407 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 408 {                                                                             \
 409         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 410 }                                                                             \
 411 TUNE_ATTR_3(name, name##_show, store)
 412
 413 #define TUNE_ATTR(name, check_zero)                                           \
 414 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 415 {                                                                             \
 416         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 417 }                                                                             \
 418 TUNE_ATTR_2(name, name##_store)
 419
 420 #define TUNE_ATTR_DAEMON(name, process)                                       \
 421 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 422 {                                                                             \
 423         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
 424         wake_up_process(sdp->sd_##process);                                   \
 425         return r;                                                             \
 426 }                                                                             \
 427 TUNE_ATTR_2(name, name##_store)
 428
 429 TUNE_ATTR(demote_secs, 0);
 430 TUNE_ATTR(incore_log_blocks, 0);
 431 TUNE_ATTR(log_flush_secs, 0);
 432 TUNE_ATTR(jindex_refresh_secs, 0);
 433 TUNE_ATTR(quota_warn_period, 0);
 434 TUNE_ATTR(quota_quantum, 0);
 435 TUNE_ATTR(atime_quantum, 0);
 436 TUNE_ATTR(max_readahead, 0);
 437 TUNE_ATTR(complain_secs, 0);
 438 TUNE_ATTR(reclaim_limit, 0);
 439 TUNE_ATTR(statfs_slow, 0);
 440 TUNE_ATTR(new_files_jdata, 0);
 441 TUNE_ATTR(new_files_directio, 0);
 442 TUNE_ATTR(quota_simul_sync, 1);
 443 TUNE_ATTR(quota_cache_secs, 1);
 444 TUNE_ATTR(stall_secs, 1);
 445 TUNE_ATTR(statfs_quantum, 1);
 446 TUNE_ATTR_DAEMON(scand_secs, scand_process);
 447 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
 448 TUNE_ATTR_DAEMON(logd_secs, logd_process);
 449 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
 450 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 451
 452 static struct attribute *tune_attrs[] = {
 453         &tune_attr_demote_secs.attr,
 454         &tune_attr_incore_log_blocks.attr,
 455         &tune_attr_log_flush_secs.attr,
 456         &tune_attr_jindex_refresh_secs.attr,
 457         &tune_attr_quota_warn_period.attr,
 458         &tune_attr_quota_quantum.attr,
 459         &tune_attr_atime_quantum.attr,
 460         &tune_attr_max_readahead.attr,
 461         &tune_attr_complain_secs.attr,
 462         &tune_attr_reclaim_limit.attr,
 463         &tune_attr_statfs_slow.attr,
 464         &tune_attr_quota_simul_sync.attr,
 465         &tune_attr_quota_cache_secs.attr,
 466         &tune_attr_stall_secs.attr,
 467         &tune_attr_statfs_quantum.attr,
 468         &tune_attr_scand_secs.attr,
 469         &tune_attr_recoverd_secs.attr,
 470         &tune_attr_logd_secs.attr,
 471         &tune_attr_quotad_secs.attr,
 472         &tune_attr_quota_scale.attr,
 473         &tune_attr_new_files_jdata.attr,
 474         &tune_attr_new_files_directio.attr,
 475         NULL,
 476 };
 477
 478 static struct attribute_group lockstruct_group = {
 479         .name = "lockstruct",
 480         .attrs = lockstruct_attrs,
 481 };
 482
 483 static struct attribute_group counters_group = {
 484         .name = "counters",
 485         .attrs = counters_attrs,
 486 };
 487
 488 static struct attribute_group args_group = {
 489         .name = "args",
 490         .attrs = args_attrs,
 491 };
 492
 493 static struct attribute_group tune_group = {
 494         .name = "tune",
 495         .attrs = tune_attrs,
 496 };
 497
 498 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 499 {
 500         int error;
 501
 502         sdp->sd_kobj.kset = &gfs2_kset;
 503         sdp->sd_kobj.ktype = &gfs2_ktype;
 504
 505         error = kobject_set_name(&sdp->sd_kobj, "%s", sdp->sd_table_name);
 506         if (error)
 507                 goto fail;
 508
 509         error = kobject_register(&sdp->sd_kobj);
 510         if (error)
 511                 goto fail;
 512
 513         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
 514         if (error)
 515                 goto fail_reg;
 516
 517         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
 518         if (error)
 519                 goto fail_lockstruct;
 520
 521         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
 522         if (error)
 523                 goto fail_counters;
 524
 525         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 526         if (error)
 527                 goto fail_args;
 528
 529         return 0;
 530
 531 fail_args:
 532         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 533 fail_counters:
 534         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 535 fail_lockstruct:
 536         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 537 fail_reg:
 538         kobject_unregister(&sdp->sd_kobj);
 539 fail:
 540         fs_err(sdp, "error %d adding sysfs files", error);
 541         return error;
 542 }
 543
 544 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 545 {
 546         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 547         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 548         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 549         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 550         kobject_unregister(&sdp->sd_kobj);
 551 }
 552
 553 int gfs2_sys_init(void)
 554 {
 555         gfs2_sys_margs = NULL;
 556         spin_lock_init(&gfs2_sys_margs_lock);
 557         return kset_register(&gfs2_kset);
 558 }
 559
 560 void gfs2_sys_uninit(void)
 561 {
 562         kfree(gfs2_sys_margs);
 563         kset_unregister(&gfs2_kset);
 564 }
 565