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, "%u:%u\n",
  36                         MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
  37 }
  38
  39 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  40 {
  41         return snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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         u32 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         u32 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
 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 snprintf(buf, PAGE_SIZE, 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 snprintf(buf, PAGE_SIZE, 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 snprintf(buf, PAGE_SIZE, "%d\n",
 291                         !!test_bit(SDF_NOATIME, &sdp->sd_flags));
 292 }
 293 static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
 294
 295 static struct attribute *args_attrs[] = {
 296         &args_attr_lockproto.attr,
 297         &args_attr_locktable.attr,
 298         &args_attr_hostdata.attr,
 299         &args_attr_spectator.attr,
 300         &args_attr_ignore_local_fs.attr,
 301         &args_attr_localcaching.attr,
 302         &args_attr_localflocks.attr,
 303         &args_attr_debug.attr,
 304         &args_attr_upgrade.attr,
 305         &args_attr_num_glockd.attr,
 306         &args_attr_posix_acl.attr,
 307         &args_attr_quota.attr,
 308         &args_attr_suiddir.attr,
 309         &args_attr_data.attr,
 310         &args_attr_noatime.attr,
 311         NULL,
 312 };
 313
 314 /*
 315  * display counters from superblock
 316  */
 317
 318 struct counters_attr {
 319         struct attribute attr;
 320         ssize_t (*show)(struct gfs2_sbd *, char *);
 321 };
 322
 323 #define COUNTERS_ATTR(name, fmt)                                            \
 324 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 325 {                                                                           \
 326         return snprintf(buf, PAGE_SIZE, fmt,                                \
 327                         (unsigned int)atomic_read(&sdp->sd_##name));        \
 328 }                                                                           \
 329 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
 330
 331 COUNTERS_ATTR(glock_count,      "%u\n");
 332 COUNTERS_ATTR(glock_held_count, "%u\n");
 333 COUNTERS_ATTR(inode_count,      "%u\n");
 334 COUNTERS_ATTR(reclaimed,        "%u\n");
 335
 336 static struct attribute *counters_attrs[] = {
 337         &counters_attr_glock_count.attr,
 338         &counters_attr_glock_held_count.attr,
 339         &counters_attr_inode_count.attr,
 340         &counters_attr_reclaimed.attr,
 341         NULL,
 342 };
 343
 344 /*
 345  * get and set struct gfs2_tune fields
 346  */
 347
 348 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 349 {
 350         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 351                         sdp->sd_tune.gt_quota_scale_num,
 352                         sdp->sd_tune.gt_quota_scale_den);
 353 }
 354
 355 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 356                                  size_t len)
 357 {
 358         struct gfs2_tune *gt = &sdp->sd_tune;
 359         unsigned int x, y;
 360
 361         if (!capable(CAP_SYS_ADMIN))
 362                 return -EACCES;
 363
 364         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 365                 return -EINVAL;
 366
 367         spin_lock(&gt->gt_spin);
 368         gt->gt_quota_scale_num = x;
 369         gt->gt_quota_scale_den = y;
 370         spin_unlock(&gt->gt_spin);
 371         return len;
 372 }
 373
 374 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 375                         int check_zero, const char *buf, size_t len)
 376 {
 377         struct gfs2_tune *gt = &sdp->sd_tune;
 378         unsigned int x;
 379
 380         if (!capable(CAP_SYS_ADMIN))
 381                 return -EACCES;
 382
 383         x = simple_strtoul(buf, NULL, 0);
 384
 385         if (check_zero && !x)
 386                 return -EINVAL;
 387
 388         spin_lock(&gt->gt_spin);
 389         *field = x;
 390         spin_unlock(&gt->gt_spin);
 391         return len;
 392 }
 393
 394 struct tune_attr {
 395         struct attribute attr;
 396         ssize_t (*show)(struct gfs2_sbd *, char *);
 397         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 398 };
 399
 400 #define TUNE_ATTR_3(name, show, store)                                        \
 401 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 402
 403 #define TUNE_ATTR_2(name, store)                                              \
 404 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 405 {                                                                             \
 406         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 407 }                                                                             \
 408 TUNE_ATTR_3(name, name##_show, store)
 409
 410 #define TUNE_ATTR(name, check_zero)                                           \
 411 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 412 {                                                                             \
 413         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 414 }                                                                             \
 415 TUNE_ATTR_2(name, name##_store)
 416
 417 #define TUNE_ATTR_DAEMON(name, process)                                       \
 418 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 419 {                                                                             \
 420         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
 421         wake_up_process(sdp->sd_##process);                                   \
 422         return r;                                                             \
 423 }                                                                             \
 424 TUNE_ATTR_2(name, name##_store)
 425
 426 TUNE_ATTR(demote_secs, 0);
 427 TUNE_ATTR(incore_log_blocks, 0);
 428 TUNE_ATTR(log_flush_secs, 0);
 429 TUNE_ATTR(quota_warn_period, 0);
 430 TUNE_ATTR(quota_quantum, 0);
 431 TUNE_ATTR(atime_quantum, 0);
 432 TUNE_ATTR(max_readahead, 0);
 433 TUNE_ATTR(complain_secs, 0);
 434 TUNE_ATTR(statfs_slow, 0);
 435 TUNE_ATTR(new_files_jdata, 0);
 436 TUNE_ATTR(new_files_directio, 0);
 437 TUNE_ATTR(quota_simul_sync, 1);
 438 TUNE_ATTR(quota_cache_secs, 1);
 439 TUNE_ATTR(stall_secs, 1);
 440 TUNE_ATTR(statfs_quantum, 1);
 441 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
 442 TUNE_ATTR_DAEMON(logd_secs, logd_process);
 443 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
 444 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 445
 446 static struct attribute *tune_attrs[] = {
 447         &tune_attr_demote_secs.attr,
 448         &tune_attr_incore_log_blocks.attr,
 449         &tune_attr_log_flush_secs.attr,
 450         &tune_attr_quota_warn_period.attr,
 451         &tune_attr_quota_quantum.attr,
 452         &tune_attr_atime_quantum.attr,
 453         &tune_attr_max_readahead.attr,
 454         &tune_attr_complain_secs.attr,
 455         &tune_attr_statfs_slow.attr,
 456         &tune_attr_quota_simul_sync.attr,
 457         &tune_attr_quota_cache_secs.attr,
 458         &tune_attr_stall_secs.attr,
 459         &tune_attr_statfs_quantum.attr,
 460         &tune_attr_recoverd_secs.attr,
 461         &tune_attr_logd_secs.attr,
 462         &tune_attr_quotad_secs.attr,
 463         &tune_attr_quota_scale.attr,
 464         &tune_attr_new_files_jdata.attr,
 465         &tune_attr_new_files_directio.attr,
 466         NULL,
 467 };
 468
 469 static struct attribute_group lockstruct_group = {
 470         .name = "lockstruct",
 471         .attrs = lockstruct_attrs,
 472 };
 473
 474 static struct attribute_group counters_group = {
 475         .name = "counters",
 476         .attrs = counters_attrs,
 477 };
 478
 479 static struct attribute_group args_group = {
 480         .name = "args",
 481         .attrs = args_attrs,
 482 };
 483
 484 static struct attribute_group tune_group = {
 485         .name = "tune",
 486         .attrs = tune_attrs,
 487 };
 488
 489 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 490 {
 491         int error;
 492
 493         sdp->sd_kobj.kset = gfs2_kset;
 494         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 495                                      "%s", sdp->sd_table_name);
 496         if (error)
 497                 goto fail;
 498
 499         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
 500         if (error)
 501                 goto fail_reg;
 502
 503         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
 504         if (error)
 505                 goto fail_lockstruct;
 506
 507         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
 508         if (error)
 509                 goto fail_counters;
 510
 511         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 512         if (error)
 513                 goto fail_args;
 514
 515         kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
 516         return 0;
 517
 518 fail_args:
 519         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 520 fail_counters:
 521         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 522 fail_lockstruct:
 523         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 524 fail_reg:
 525         kobject_put(&sdp->sd_kobj);
 526 fail:
 527         fs_err(sdp, "error %d adding sysfs files", error);
 528         return error;
 529 }
 530
 531 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 532 {
 533         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 534         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 535         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 536         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 537         kobject_put(&sdp->sd_kobj);
 538 }
 539
 540 int gfs2_sys_init(void)
 541 {
 542         gfs2_sys_margs = NULL;
 543         spin_lock_init(&gfs2_sys_margs_lock);
 544         gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj);
 545         if (!gfs2_kset)
 546                 return -ENOMEM;
 547         return 0;
 548 }
 549
 550 void gfs2_sys_uninit(void)
 551 {
 552         kfree(gfs2_sys_margs);
 553         kset_unregister(gfs2_kset);
 554 }
 555