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 quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 114                                 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_quota_sync(sdp);
 123         return len;
 124 }
 125
 126 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 127                                         size_t len)
 128 {
 129         u32 id;
 130
 131         if (!capable(CAP_SYS_ADMIN))
 132                 return -EACCES;
 133
 134         id = simple_strtoul(buf, NULL, 0);
 135
 136         gfs2_quota_refresh(sdp, 1, id);
 137         return len;
 138 }
 139
 140 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 141                                          size_t len)
 142 {
 143         u32 id;
 144
 145         if (!capable(CAP_SYS_ADMIN))
 146                 return -EACCES;
 147
 148         id = simple_strtoul(buf, NULL, 0);
 149
 150         gfs2_quota_refresh(sdp, 0, id);
 151         return len;
 152 }
 153
 154 struct gfs2_attr {
 155         struct attribute attr;
 156         ssize_t (*show)(struct gfs2_sbd *, char *);
 157         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 158 };
 159
 160 #define GFS2_ATTR(name, mode, show, store) \
 161 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 162
 163 GFS2_ATTR(id,                  0444, id_show,       NULL);
 164 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 165 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 166 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 167 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 168 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 169 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 170 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 171
 172 static struct attribute *gfs2_attrs[] = {
 173         &gfs2_attr_id.attr,
 174         &gfs2_attr_fsname.attr,
 175         &gfs2_attr_freeze.attr,
 176         &gfs2_attr_withdraw.attr,
 177         &gfs2_attr_statfs_sync.attr,
 178         &gfs2_attr_quota_sync.attr,
 179         &gfs2_attr_quota_refresh_user.attr,
 180         &gfs2_attr_quota_refresh_group.attr,
 181         NULL,
 182 };
 183
 184 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
 185                               char *buf)
 186 {
 187         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 188         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 189         return a->show ? a->show(sdp, buf) : 0;
 190 }
 191
 192 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
 193                                const char *buf, size_t len)
 194 {
 195         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 196         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 197         return a->store ? a->store(sdp, buf, len) : len;
 198 }
 199
 200 static struct sysfs_ops gfs2_attr_ops = {
 201         .show  = gfs2_attr_show,
 202         .store = gfs2_attr_store,
 203 };
 204
 205 static struct kobj_type gfs2_ktype = {
 206         .default_attrs = gfs2_attrs,
 207         .sysfs_ops     = &gfs2_attr_ops,
 208 };
 209
 210 static struct kset *gfs2_kset;
 211
 212 /*
 213  * display struct lm_lockstruct fields
 214  */
 215
 216 struct lockstruct_attr {
 217         struct attribute attr;
 218         ssize_t (*show)(struct gfs2_sbd *, char *);
 219 };
 220
 221 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
 222 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 223 {                                                                           \
 224         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
 225 }                                                                           \
 226 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
 227
 228 LOCKSTRUCT_ATTR(jid,      "%u\n");
 229 LOCKSTRUCT_ATTR(first,    "%u\n");
 230 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
 231 LOCKSTRUCT_ATTR(flags,    "%d\n");
 232
 233 static struct attribute *lockstruct_attrs[] = {
 234         &lockstruct_attr_jid.attr,
 235         &lockstruct_attr_first.attr,
 236         &lockstruct_attr_lvb_size.attr,
 237         &lockstruct_attr_flags.attr,
 238         NULL,
 239 };
 240
 241 /*
 242  * display struct gfs2_args fields
 243  */
 244
 245 struct args_attr {
 246         struct attribute attr;
 247         ssize_t (*show)(struct gfs2_sbd *, char *);
 248 };
 249
 250 #define ARGS_ATTR(name, fmt)                                                \
 251 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 252 {                                                                           \
 253         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
 254 }                                                                           \
 255 static struct args_attr args_attr_##name = __ATTR_RO(name)
 256
 257 ARGS_ATTR(lockproto,       "%s\n");
 258 ARGS_ATTR(locktable,       "%s\n");
 259 ARGS_ATTR(hostdata,        "%s\n");
 260 ARGS_ATTR(spectator,       "%d\n");
 261 ARGS_ATTR(ignore_local_fs, "%d\n");
 262 ARGS_ATTR(localcaching,    "%d\n");
 263 ARGS_ATTR(localflocks,     "%d\n");
 264 ARGS_ATTR(debug,           "%d\n");
 265 ARGS_ATTR(upgrade,         "%d\n");
 266 ARGS_ATTR(num_glockd,      "%u\n");
 267 ARGS_ATTR(posix_acl,       "%d\n");
 268 ARGS_ATTR(quota,           "%u\n");
 269 ARGS_ATTR(suiddir,         "%d\n");
 270 ARGS_ATTR(data,            "%d\n");
 271
 272 static struct attribute *args_attrs[] = {
 273         &args_attr_lockproto.attr,
 274         &args_attr_locktable.attr,
 275         &args_attr_hostdata.attr,
 276         &args_attr_spectator.attr,
 277         &args_attr_ignore_local_fs.attr,
 278         &args_attr_localcaching.attr,
 279         &args_attr_localflocks.attr,
 280         &args_attr_debug.attr,
 281         &args_attr_upgrade.attr,
 282         &args_attr_num_glockd.attr,
 283         &args_attr_posix_acl.attr,
 284         &args_attr_quota.attr,
 285         &args_attr_suiddir.attr,
 286         &args_attr_data.attr,
 287         NULL,
 288 };
 289
 290 /*
 291  * display counters from superblock
 292  */
 293
 294 struct counters_attr {
 295         struct attribute attr;
 296         ssize_t (*show)(struct gfs2_sbd *, char *);
 297 };
 298
 299 #define COUNTERS_ATTR(name, fmt)                                            \
 300 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 301 {                                                                           \
 302         return snprintf(buf, PAGE_SIZE, fmt,                                \
 303                         (unsigned int)atomic_read(&sdp->sd_##name));        \
 304 }                                                                           \
 305 static struct counters_attr counters_attr_##name = __ATTR_RO(name)
 306
 307 COUNTERS_ATTR(reclaimed,        "%u\n");
 308
 309 static struct attribute *counters_attrs[] = {
 310         &counters_attr_reclaimed.attr,
 311         NULL,
 312 };
 313
 314 /*
 315  * get and set struct gfs2_tune fields
 316  */
 317
 318 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 319 {
 320         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 321                         sdp->sd_tune.gt_quota_scale_num,
 322                         sdp->sd_tune.gt_quota_scale_den);
 323 }
 324
 325 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 326                                  size_t len)
 327 {
 328         struct gfs2_tune *gt = &sdp->sd_tune;
 329         unsigned int x, y;
 330
 331         if (!capable(CAP_SYS_ADMIN))
 332                 return -EACCES;
 333
 334         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 335                 return -EINVAL;
 336
 337         spin_lock(&gt->gt_spin);
 338         gt->gt_quota_scale_num = x;
 339         gt->gt_quota_scale_den = y;
 340         spin_unlock(&gt->gt_spin);
 341         return len;
 342 }
 343
 344 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 345                         int check_zero, const char *buf, size_t len)
 346 {
 347         struct gfs2_tune *gt = &sdp->sd_tune;
 348         unsigned int x;
 349
 350         if (!capable(CAP_SYS_ADMIN))
 351                 return -EACCES;
 352
 353         x = simple_strtoul(buf, NULL, 0);
 354
 355         if (check_zero && !x)
 356                 return -EINVAL;
 357
 358         spin_lock(&gt->gt_spin);
 359         *field = x;
 360         spin_unlock(&gt->gt_spin);
 361         return len;
 362 }
 363
 364 struct tune_attr {
 365         struct attribute attr;
 366         ssize_t (*show)(struct gfs2_sbd *, char *);
 367         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 368 };
 369
 370 #define TUNE_ATTR_3(name, show, store)                                        \
 371 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 372
 373 #define TUNE_ATTR_2(name, store)                                              \
 374 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 375 {                                                                             \
 376         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 377 }                                                                             \
 378 TUNE_ATTR_3(name, name##_show, store)
 379
 380 #define TUNE_ATTR(name, check_zero)                                           \
 381 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 382 {                                                                             \
 383         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 384 }                                                                             \
 385 TUNE_ATTR_2(name, name##_store)
 386
 387 #define TUNE_ATTR_DAEMON(name, process)                                       \
 388 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 389 {                                                                             \
 390         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
 391         wake_up_process(sdp->sd_##process);                                   \
 392         return r;                                                             \
 393 }                                                                             \
 394 TUNE_ATTR_2(name, name##_store)
 395
 396 TUNE_ATTR(demote_secs, 0);
 397 TUNE_ATTR(incore_log_blocks, 0);
 398 TUNE_ATTR(log_flush_secs, 0);
 399 TUNE_ATTR(quota_warn_period, 0);
 400 TUNE_ATTR(quota_quantum, 0);
 401 TUNE_ATTR(max_readahead, 0);
 402 TUNE_ATTR(complain_secs, 0);
 403 TUNE_ATTR(statfs_slow, 0);
 404 TUNE_ATTR(new_files_jdata, 0);
 405 TUNE_ATTR(quota_simul_sync, 1);
 406 TUNE_ATTR(quota_cache_secs, 1);
 407 TUNE_ATTR(stall_secs, 1);
 408 TUNE_ATTR(statfs_quantum, 1);
 409 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
 410 TUNE_ATTR_DAEMON(logd_secs, logd_process);
 411 TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
 412 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 413
 414 static struct attribute *tune_attrs[] = {
 415         &tune_attr_demote_secs.attr,
 416         &tune_attr_incore_log_blocks.attr,
 417         &tune_attr_log_flush_secs.attr,
 418         &tune_attr_quota_warn_period.attr,
 419         &tune_attr_quota_quantum.attr,
 420         &tune_attr_max_readahead.attr,
 421         &tune_attr_complain_secs.attr,
 422         &tune_attr_statfs_slow.attr,
 423         &tune_attr_quota_simul_sync.attr,
 424         &tune_attr_quota_cache_secs.attr,
 425         &tune_attr_stall_secs.attr,
 426         &tune_attr_statfs_quantum.attr,
 427         &tune_attr_recoverd_secs.attr,
 428         &tune_attr_logd_secs.attr,
 429         &tune_attr_quotad_secs.attr,
 430         &tune_attr_quota_scale.attr,
 431         &tune_attr_new_files_jdata.attr,
 432         NULL,
 433 };
 434
 435 static struct attribute_group lockstruct_group = {
 436         .name = "lockstruct",
 437         .attrs = lockstruct_attrs,
 438 };
 439
 440 static struct attribute_group counters_group = {
 441         .name = "counters",
 442         .attrs = counters_attrs,
 443 };
 444
 445 static struct attribute_group args_group = {
 446         .name = "args",
 447         .attrs = args_attrs,
 448 };
 449
 450 static struct attribute_group tune_group = {
 451         .name = "tune",
 452         .attrs = tune_attrs,
 453 };
 454
 455 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 456 {
 457         int error;
 458
 459         sdp->sd_kobj.kset = gfs2_kset;
 460         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 461                                      "%s", sdp->sd_table_name);
 462         if (error)
 463                 goto fail;
 464
 465         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
 466         if (error)
 467                 goto fail_reg;
 468
 469         error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
 470         if (error)
 471                 goto fail_lockstruct;
 472
 473         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
 474         if (error)
 475                 goto fail_counters;
 476
 477         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 478         if (error)
 479                 goto fail_args;
 480
 481         kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
 482         return 0;
 483
 484 fail_args:
 485         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 486 fail_counters:
 487         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 488 fail_lockstruct:
 489         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 490 fail_reg:
 491         kobject_put(&sdp->sd_kobj);
 492 fail:
 493         fs_err(sdp, "error %d adding sysfs files", error);
 494         return error;
 495 }
 496
 497 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 498 {
 499         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 500         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 501         sysfs_remove_group(&sdp->sd_kobj, &counters_group);
 502         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 503         kobject_put(&sdp->sd_kobj);
 504 }
 505
 506 int gfs2_sys_init(void)
 507 {
 508         gfs2_sys_margs = NULL;
 509         spin_lock_init(&gfs2_sys_margs_lock);
 510         gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj);
 511         if (!gfs2_kset)
 512                 return -ENOMEM;
 513         return 0;
 514 }
 515
 516 void gfs2_sys_uninit(void)
 517 {
 518         kfree(gfs2_sys_margs);
 519         kset_unregister(gfs2_kset);
 520 }
 521