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 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
  30 {
  31         return snprintf(buf, PAGE_SIZE, "%u:%u\n",
  32                         MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
  33 }
  34
  35 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
  36 {
  37         return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
  38 }
  39
  40 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
  41 {
  42         unsigned int count;
  43
  44         mutex_lock(&sdp->sd_freeze_lock);
  45         count = sdp->sd_freeze_count;
  46         mutex_unlock(&sdp->sd_freeze_lock);
  47
  48         return snprintf(buf, PAGE_SIZE, "%u\n", count);
  49 }
  50
  51 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  52 {
  53         ssize_t ret = len;
  54         int error = 0;
  55         int n = simple_strtol(buf, NULL, 0);
  56
  57         if (!capable(CAP_SYS_ADMIN))
  58                 return -EACCES;
  59
  60         switch (n) {
  61         case 0:
  62                 gfs2_unfreeze_fs(sdp);
  63                 break;
  64         case 1:
  65                 error = gfs2_freeze_fs(sdp);
  66                 break;
  67         default:
  68                 ret = -EINVAL;
  69         }
  70
  71         if (error)
  72                 fs_warn(sdp, "freeze %d error %d", n, error);
  73
  74         return ret;
  75 }
  76
  77 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
  78 {
  79         unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
  80         return snprintf(buf, PAGE_SIZE, "%u\n", b);
  81 }
  82
  83 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
  84 {
  85         if (!capable(CAP_SYS_ADMIN))
  86                 return -EACCES;
  87
  88         if (simple_strtol(buf, NULL, 0) != 1)
  89                 return -EINVAL;
  90
  91         gfs2_lm_withdraw(sdp,
  92                 "GFS2: fsid=%s: withdrawing from cluster at user's request\n",
  93                 sdp->sd_fsname);
  94         return len;
  95 }
  96
  97 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
  98                                  size_t len)
  99 {
 100         if (!capable(CAP_SYS_ADMIN))
 101                 return -EACCES;
 102
 103         if (simple_strtol(buf, NULL, 0) != 1)
 104                 return -EINVAL;
 105
 106         gfs2_statfs_sync(sdp);
 107         return len;
 108 }
 109
 110 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
 111                                 size_t len)
 112 {
 113         if (!capable(CAP_SYS_ADMIN))
 114                 return -EACCES;
 115
 116         if (simple_strtol(buf, NULL, 0) != 1)
 117                 return -EINVAL;
 118
 119         gfs2_quota_sync(sdp);
 120         return len;
 121 }
 122
 123 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
 124                                         size_t len)
 125 {
 126         u32 id;
 127
 128         if (!capable(CAP_SYS_ADMIN))
 129                 return -EACCES;
 130
 131         id = simple_strtoul(buf, NULL, 0);
 132
 133         gfs2_quota_refresh(sdp, 1, id);
 134         return len;
 135 }
 136
 137 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
 138                                          size_t len)
 139 {
 140         u32 id;
 141
 142         if (!capable(CAP_SYS_ADMIN))
 143                 return -EACCES;
 144
 145         id = simple_strtoul(buf, NULL, 0);
 146
 147         gfs2_quota_refresh(sdp, 0, id);
 148         return len;
 149 }
 150
 151 struct gfs2_attr {
 152         struct attribute attr;
 153         ssize_t (*show)(struct gfs2_sbd *, char *);
 154         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 155 };
 156
 157 #define GFS2_ATTR(name, mode, show, store) \
 158 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
 159
 160 GFS2_ATTR(id,                  0444, id_show,       NULL);
 161 GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
 162 GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
 163 GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
 164 GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
 165 GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
 166 GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
 167 GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
 168
 169 static struct attribute *gfs2_attrs[] = {
 170         &gfs2_attr_id.attr,
 171         &gfs2_attr_fsname.attr,
 172         &gfs2_attr_freeze.attr,
 173         &gfs2_attr_withdraw.attr,
 174         &gfs2_attr_statfs_sync.attr,
 175         &gfs2_attr_quota_sync.attr,
 176         &gfs2_attr_quota_refresh_user.attr,
 177         &gfs2_attr_quota_refresh_group.attr,
 178         NULL,
 179 };
 180
 181 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
 182                               char *buf)
 183 {
 184         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 185         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 186         return a->show ? a->show(sdp, buf) : 0;
 187 }
 188
 189 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
 190                                const char *buf, size_t len)
 191 {
 192         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 193         struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
 194         return a->store ? a->store(sdp, buf, len) : len;
 195 }
 196
 197 static struct sysfs_ops gfs2_attr_ops = {
 198         .show  = gfs2_attr_show,
 199         .store = gfs2_attr_store,
 200 };
 201
 202 static struct kobj_type gfs2_ktype = {
 203         .default_attrs = gfs2_attrs,
 204         .sysfs_ops     = &gfs2_attr_ops,
 205 };
 206
 207 static struct kset *gfs2_kset;
 208
 209 /*
 210  * display struct lm_lockstruct fields
 211  */
 212
 213 struct lockstruct_attr {
 214         struct attribute attr;
 215         ssize_t (*show)(struct gfs2_sbd *, char *);
 216 };
 217
 218 #define LOCKSTRUCT_ATTR(name, fmt)                                          \
 219 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 220 {                                                                           \
 221         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
 222 }                                                                           \
 223 static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
 224
 225 LOCKSTRUCT_ATTR(jid,      "%u\n");
 226 LOCKSTRUCT_ATTR(first,    "%u\n");
 227 LOCKSTRUCT_ATTR(lvb_size, "%u\n");
 228 LOCKSTRUCT_ATTR(flags,    "%d\n");
 229
 230 static struct attribute *lockstruct_attrs[] = {
 231         &lockstruct_attr_jid.attr,
 232         &lockstruct_attr_first.attr,
 233         &lockstruct_attr_lvb_size.attr,
 234         &lockstruct_attr_flags.attr,
 235         NULL,
 236 };
 237
 238 /*
 239  * display struct gfs2_args fields
 240  */
 241
 242 struct args_attr {
 243         struct attribute attr;
 244         ssize_t (*show)(struct gfs2_sbd *, char *);
 245 };
 246
 247 #define ARGS_ATTR(name, fmt)                                                \
 248 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
 249 {                                                                           \
 250         return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
 251 }                                                                           \
 252 static struct args_attr args_attr_##name = __ATTR_RO(name)
 253
 254 ARGS_ATTR(lockproto,       "%s\n");
 255 ARGS_ATTR(locktable,       "%s\n");
 256 ARGS_ATTR(hostdata,        "%s\n");
 257 ARGS_ATTR(spectator,       "%d\n");
 258 ARGS_ATTR(ignore_local_fs, "%d\n");
 259 ARGS_ATTR(localcaching,    "%d\n");
 260 ARGS_ATTR(localflocks,     "%d\n");
 261 ARGS_ATTR(debug,           "%d\n");
 262 ARGS_ATTR(upgrade,         "%d\n");
 263 ARGS_ATTR(posix_acl,       "%d\n");
 264 ARGS_ATTR(quota,           "%u\n");
 265 ARGS_ATTR(suiddir,         "%d\n");
 266 ARGS_ATTR(data,            "%d\n");
 267
 268 static struct attribute *args_attrs[] = {
 269         &args_attr_lockproto.attr,
 270         &args_attr_locktable.attr,
 271         &args_attr_hostdata.attr,
 272         &args_attr_spectator.attr,
 273         &args_attr_ignore_local_fs.attr,
 274         &args_attr_localcaching.attr,
 275         &args_attr_localflocks.attr,
 276         &args_attr_debug.attr,
 277         &args_attr_upgrade.attr,
 278         &args_attr_posix_acl.attr,
 279         &args_attr_quota.attr,
 280         &args_attr_suiddir.attr,
 281         &args_attr_data.attr,
 282         NULL,
 283 };
 284
 285 /*
 286  * get and set struct gfs2_tune fields
 287  */
 288
 289 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
 290 {
 291         return snprintf(buf, PAGE_SIZE, "%u %u\n",
 292                         sdp->sd_tune.gt_quota_scale_num,
 293                         sdp->sd_tune.gt_quota_scale_den);
 294 }
 295
 296 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
 297                                  size_t len)
 298 {
 299         struct gfs2_tune *gt = &sdp->sd_tune;
 300         unsigned int x, y;
 301
 302         if (!capable(CAP_SYS_ADMIN))
 303                 return -EACCES;
 304
 305         if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
 306                 return -EINVAL;
 307
 308         spin_lock(&gt->gt_spin);
 309         gt->gt_quota_scale_num = x;
 310         gt->gt_quota_scale_den = y;
 311         spin_unlock(&gt->gt_spin);
 312         return len;
 313 }
 314
 315 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
 316                         int check_zero, const char *buf, size_t len)
 317 {
 318         struct gfs2_tune *gt = &sdp->sd_tune;
 319         unsigned int x;
 320
 321         if (!capable(CAP_SYS_ADMIN))
 322                 return -EACCES;
 323
 324         x = simple_strtoul(buf, NULL, 0);
 325
 326         if (check_zero && !x)
 327                 return -EINVAL;
 328
 329         spin_lock(&gt->gt_spin);
 330         *field = x;
 331         spin_unlock(&gt->gt_spin);
 332         return len;
 333 }
 334
 335 struct tune_attr {
 336         struct attribute attr;
 337         ssize_t (*show)(struct gfs2_sbd *, char *);
 338         ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
 339 };
 340
 341 #define TUNE_ATTR_3(name, show, store)                                        \
 342 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
 343
 344 #define TUNE_ATTR_2(name, store)                                              \
 345 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
 346 {                                                                             \
 347         return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
 348 }                                                                             \
 349 TUNE_ATTR_3(name, name##_show, store)
 350
 351 #define TUNE_ATTR(name, check_zero)                                           \
 352 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 353 {                                                                             \
 354         return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
 355 }                                                                             \
 356 TUNE_ATTR_2(name, name##_store)
 357
 358 #define TUNE_ATTR_DAEMON(name, process)                                       \
 359 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
 360 {                                                                             \
 361         ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
 362         wake_up_process(sdp->sd_##process);                                   \
 363         return r;                                                             \
 364 }                                                                             \
 365 TUNE_ATTR_2(name, name##_store)
 366
 367 TUNE_ATTR(incore_log_blocks, 0);
 368 TUNE_ATTR(log_flush_secs, 0);
 369 TUNE_ATTR(quota_warn_period, 0);
 370 TUNE_ATTR(quota_quantum, 0);
 371 TUNE_ATTR(max_readahead, 0);
 372 TUNE_ATTR(complain_secs, 0);
 373 TUNE_ATTR(statfs_slow, 0);
 374 TUNE_ATTR(new_files_jdata, 0);
 375 TUNE_ATTR(quota_simul_sync, 1);
 376 TUNE_ATTR(quota_cache_secs, 1);
 377 TUNE_ATTR(stall_secs, 1);
 378 TUNE_ATTR(statfs_quantum, 1);
 379 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
 380 TUNE_ATTR_DAEMON(logd_secs, logd_process);
 381 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
 382
 383 static struct attribute *tune_attrs[] = {
 384         &tune_attr_incore_log_blocks.attr,
 385         &tune_attr_log_flush_secs.attr,
 386         &tune_attr_quota_warn_period.attr,
 387         &tune_attr_quota_quantum.attr,
 388         &tune_attr_max_readahead.attr,
 389         &tune_attr_complain_secs.attr,
 390         &tune_attr_statfs_slow.attr,
 391         &tune_attr_quota_simul_sync.attr,
 392         &tune_attr_quota_cache_secs.attr,
 393         &tune_attr_stall_secs.attr,
 394         &tune_attr_statfs_quantum.attr,
 395         &tune_attr_recoverd_secs.attr,
 396         &tune_attr_logd_secs.attr,
 397         &tune_attr_quota_scale.attr,
 398         &tune_attr_new_files_jdata.attr,
 399         NULL,
 400 };
 401
 402 static struct attribute_group lockstruct_group = {
 403         .name = "lockstruct",
 404         .attrs = lockstruct_attrs,
 405 };
 406
 407 static struct attribute_group args_group = {
 408         .name = "args",
 409         .attrs = args_attrs,
 410 };
 411
 412 static struct attribute_group tune_group = {
 413         .name = "tune",
 414         .attrs = tune_attrs,
 415 };
 416
 417 int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
 418 {
 419         int error;
 420
 421         sdp->sd_kobj.kset = gfs2_kset;
 422         error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
 423                                      "%s", sdp->sd_table_name);
 424         if (error)
 425                 goto fail;
 426
 427         error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
 428         if (error)
 429                 goto fail_reg;
 430
 431         error = sysfs_create_group(&sdp->sd_kobj, &args_group);
 432         if (error)
 433                 goto fail_lockstruct;
 434
 435         error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
 436         if (error)
 437                 goto fail_args;
 438
 439         kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
 440         return 0;
 441
 442 fail_args:
 443         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 444 fail_lockstruct:
 445         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 446 fail_reg:
 447         kobject_put(&sdp->sd_kobj);
 448 fail:
 449         fs_err(sdp, "error %d adding sysfs files", error);
 450         return error;
 451 }
 452
 453 void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
 454 {
 455         sysfs_remove_group(&sdp->sd_kobj, &tune_group);
 456         sysfs_remove_group(&sdp->sd_kobj, &args_group);
 457         sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
 458         kobject_put(&sdp->sd_kobj);
 459 }
 460
 461 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 462                        struct kobj_uevent_env *env)
 463 {
 464         struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 465         add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 466         add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 467         return 0;
 468 }
 469
 470 static struct kset_uevent_ops gfs2_uevent_ops = {
 471         .uevent = gfs2_uevent,
 472 };
 473
 474
 475 int gfs2_sys_init(void)
 476 {
 477         gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 478         if (!gfs2_kset)
 479                 return -ENOMEM;
 480         return 0;
 481 }
 482
 483 void gfs2_sys_uninit(void)
 484 {
 485         kset_unregister(gfs2_kset);
 486 }
 487