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 "sys.h"
  24 #include "super.h"
  25 #include "glock.h"
  26 #include "quota.h"
  27 #include "util.h"
  28
  29 char *gfs2_sys_margs;
  30 spinlock_t gfs2_sys_margs_lock;
  31
  32 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  33 {
  34         return snprintf(buf, PAGE_SIZE, "%u:%u\n",
  35                         MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
  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
 226 /*
 227  * display struct lm_lockstruct fields
 228  */
 229
 230 struct lockstruct_attr {
 231         struct attribute attr;
 232         ssize_t (*show)(struct gfs2_sbd *, char *);
 233 };
 234
 235 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
 236 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 237 {                                                                           \
 238         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
 239 }                                                                           \
 240 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
 241
 242 LOCKSTRUCT_ATTR(jid,      "%u\n");
 243 LOCKSTRUCT_ATTR(first,    "%u\n");
 244 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
 245 LOCKSTRUCT_ATTR(flags,    "%d\n");
 246
 247 static struct attribute *lockstruct_attrs[] = {
 248         &lockstruct_attr_jid.attr,
 249         &lockstruct_attr_first.attr,
 250         &lockstruct_attr_lvb_size.attr,
 251         &lockstruct_attr_flags.attr,
 252         NULL,
 253 };
 254
 255 /*
 256  * display struct gfs2_args fields
 257  */
 258
 259 struct args_attr {
 260         struct attribute attr;
 261         ssize_t (*show)(struct gfs2_sbd *, char *);
 262 };
 263
 264 #define ARGS_ATTR(name, fmt)                                                \
 265 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 266 {                                                                           \
 267         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
 268 }                                                                           \
 269 static struct args_attr args_attr_##name = __ATTR_RO(name)
 270
 271 ARGS_ATTR(lockproto,       "%s\n");
 272 ARGS_ATTR(locktable,       "%s\n");
 273 ARGS_ATTR(hostdata,        "%s\n");
 274 ARGS_ATTR(spectator,       "%d\n");
 275 ARGS_ATTR(ignore_local_fs, "%d\n");
 276 ARGS_ATTR(localcaching,    "%d\n");
 277 ARGS_ATTR(localflocks,     "%d\n");
 278 ARGS_ATTR(debug,           "%d\n");
 279 ARGS_ATTR(upgrade,         "%d\n");
 280 ARGS_ATTR(num_glockd,      "%u\n");
 281 ARGS_ATTR(posix_acl,       "%d\n");
 282 ARGS_ATTR(quota,           "%u\n");
 283 ARGS_ATTR(suiddir,         "%d\n");
 284 ARGS_ATTR(data,            "%d\n");
 285
 286 /* one oddball doesn't fit the macro mold */
 287 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
 288 {
 289         return snprintf(buf, PAGE_SIZE, "%d\n",
 290                         !!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 snprintf(buf, PAGE_SIZE, fmt,                                \
 326                         (unsigned int)atomic_read(&sdp->sd_##name));        \
 327 }                                                                           \
 328 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
 329
 330 COUNTERS_ATTR(reclaimed,        "%u\n");
 331
 332 static struct attribute *counters_attrs[] = {
 333         &counters_attr_reclaimed.attr,
 334         NULL,
 335 };
 336
 337 /*
 338  * get and set struct gfs2_tune fields
 339  */
 340
 341 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 342 {
 343         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 344                         sdp->sd_tune.gt_quota_scale_num,
 345                         sdp->sd_tune.gt_quota_scale_den);
 346 }
 347
 348 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 349                                  size_t len)
 350 {
 351         struct gfs2_tune *gt = &sdp->sd_tune;
 352         unsigned int x, y;
 353
 354         if (!capable(CAP_SYS_ADMIN))
 355                 return -EACCES;
 356
 357         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 358                 return -EINVAL;
 359
 360         spin_lock(&gt->gt_spin);
 361         gt->gt_quota_scale_num = x;
 362         gt->gt_quota_scale_den = y;
 363         spin_unlock(&gt->gt_spin);
 364         return len;
 365 }
 366
 367 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 368                         int check_zero, const char *buf, size_t len)
 369 {
 370         struct gfs2_tune *gt = &sdp->sd_tune;
 371         unsigned int x;
 372
 373         if (!capable(CAP_SYS_ADMIN))
 374                 return -EACCES;
 375
 376         x = simple_strtoul(buf, NULL, 0);
 377
 378         if (check_zero && !x)
 379                 return -EINVAL;
 380
 381         spin_lock(&gt->gt_spin);
 382         *field = x;
 383         spin_unlock(&gt->gt_spin);
 384         return len;
 385 }
 386
 387 struct tune_attr {
 388         struct attribute attr;
 389         ssize_t (*show)(struct gfs2_sbd *, char *);
 390         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 391 };
 392
 393 #define TUNE_ATTR_3(name, show, store)                                        \
 394 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 395
 396 #define TUNE_ATTR_2(name, store)                                              \
 397 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 398 {                                                                             \
 399         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 400 }                                                                             \
 401 TUNE_ATTR_3(name, name##_show, store)
 402
 403 #define TUNE_ATTR(name, check_zero)                                           \
 404 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 405 {                                                                             \
 406         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 407 }                                                                             \
 408 TUNE_ATTR_2(name, name##_store)
 409
 410 #define TUNE_ATTR_DAEMON(name, process)                                       \
 411 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 412 {                                                                             \
 413         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
 414         wake_up_process(sdp->sd_##process);                                   \
 415         return r;                                                             \
 416 }                                                                             \
 417 TUNE_ATTR_2(name, name##_store)
 418
 419 TUNE_ATTR(demote_secs, 0);
 420 TUNE_ATTR(incore_log_blocks, 0);
 421 TUNE_ATTR(log_flush_secs, 0);
 422 TUNE_ATTR(quota_warn_period, 0);
 423 TUNE_ATTR(quota_quantum, 0);
 424 TUNE_ATTR(atime_quantum, 0);
 425 TUNE_ATTR(max_readahead, 0);
 426 TUNE_ATTR(complain_secs, 0);
 427 TUNE_ATTR(statfs_slow, 0);
 428 TUNE_ATTR(new_files_jdata, 0);
 429 TUNE_ATTR(new_files_directio, 0);
 430 TUNE_ATTR(quota_simul_sync, 1);
 431 TUNE_ATTR(quota_cache_secs, 1);
 432 TUNE_ATTR(stall_secs, 1);
 433 TUNE_ATTR(statfs_quantum, 1);
 434 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
 435 TUNE_ATTR_DAEMON(logd_secs, logd_process);
 436 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
 437 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 438
 439 static struct attribute *tune_attrs[] = {
 440         &tune_attr_demote_secs.attr,
 441         &tune_attr_incore_log_blocks.attr,
 442         &tune_attr_log_flush_secs.attr,
 443         &tune_attr_quota_warn_period.attr,
 444         &tune_attr_quota_quantum.attr,
 445         &tune_attr_atime_quantum.attr,
 446         &tune_attr_max_readahead.attr,
 447         &tune_attr_complain_secs.attr,
 448         &tune_attr_statfs_slow.attr,
 449         &tune_attr_quota_simul_sync.attr,
 450         &tune_attr_quota_cache_secs.attr,
 451         &tune_attr_stall_secs.attr,
 452         &tune_attr_statfs_quantum.attr,
 453         &tune_attr_recoverd_secs.attr,
 454         &tune_attr_logd_secs.attr,
 455         &tune_attr_quotad_secs.attr,
 456         &tune_attr_quota_scale.attr,
 457         &tune_attr_new_files_jdata.attr,
 458         &tune_attr_new_files_directio.attr,
 459         NULL,
 460 };
 461
 462 static struct attribute_group lockstruct_group = {
 463         .name = "lockstruct",
 464         .attrs = lockstruct_attrs,
 465 };
 466
 467 static struct attribute_group counters_group = {
 468         .name = "counters",
 469         .attrs = counters_attrs,
 470 };
 471
 472 static struct attribute_group args_group = {
 473         .name = "args",
 474         .attrs = args_attrs,
 475 };
 476
 477 static struct attribute_group tune_group = {
 478         .name = "tune",
 479         .attrs = tune_attrs,
 480 };
 481
 482 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 483 {
 484         int error;
 485
 486         sdp->sd_kobj.kset = gfs2_kset;
 487         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 488                                      "%s", sdp->sd_table_name);
 489         if (error)
 490                 goto fail;
 491
 492         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
 493         if (error)
 494                 goto fail_reg;
 495
 496         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
 497         if (error)
 498                 goto fail_lockstruct;
 499
 500         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
 501         if (error)
 502                 goto fail_counters;
 503
 504         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 505         if (error)
 506                 goto fail_args;
 507
 508         kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
 509         return 0;
 510
 511 fail_args:
 512         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 513 fail_counters:
 514         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 515 fail_lockstruct:
 516         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 517 fail_reg:
 518         kobject_put(&sdp->sd_kobj);
 519 fail:
 520         fs_err(sdp, "error %d adding sysfs files", error);
 521         return error;
 522 }
 523
 524 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 525 {
 526         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 527         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 528         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 529         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 530         kobject_put(&sdp->sd_kobj);
 531 }
 532
 533 int gfs2_sys_init(void)
 534 {
 535         gfs2_sys_margs = NULL;
 536         spin_lock_init(&gfs2_sys_margs_lock);
 537         gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj);
 538         if (!gfs2_kset)
 539                 return -ENOMEM;
 540         return 0;
 541 }
 542
 543 void gfs2_sys_uninit(void)
 544 {
 545         kfree(gfs2_sys_margs);
 546         kset_unregister(gfs2_kset);
 547 }
 548