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 /* one oddball doesn't fit the macro mold */ 273 static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf) 274 { 275 return snprintf(buf, PAGE_SIZE, "%d\n", 276 !!test_bit(SDF_NOATIME, &sdp->sd_flags)); 277 } 278 static struct args_attr args_attr_noatime = __ATTR_RO(noatime); 279 280 static struct attribute *args_attrs[] = { 281 &args_attr_lockproto.attr, 282 &args_attr_locktable.attr, 283 &args_attr_hostdata.attr, 284 &args_attr_spectator.attr, 285 &args_attr_ignore_local_fs.attr, 286 &args_attr_localcaching.attr, 287 &args_attr_localflocks.attr, 288 &args_attr_debug.attr, 289 &args_attr_upgrade.attr, 290 &args_attr_num_glockd.attr, 291 &args_attr_posix_acl.attr, 292 &args_attr_quota.attr, 293 &args_attr_suiddir.attr, 294 &args_attr_data.attr, 295 &args_attr_noatime.attr, 296 NULL, 297 }; 298 299 /* 300 * display counters from superblock 301 */ 302 303 struct counters_attr { 304 struct attribute attr; 305 ssize_t (*show)(struct gfs2_sbd *, char *); 306 }; 307 308 #define COUNTERS_ATTR(name, fmt) \ 309 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 310 { \ 311 return snprintf(buf, PAGE_SIZE, fmt, \ 312 (unsigned int)atomic_read(&sdp->sd_##name)); \ 313 } \ 314 static struct counters_attr counters_attr_##name = __ATTR_RO(name) 315 316 COUNTERS_ATTR(reclaimed, "%u\n"); 317 318 static struct attribute *counters_attrs[] = { 319 &counters_attr_reclaimed.attr, 320 NULL, 321 }; 322 323 /* 324 * get and set struct gfs2_tune fields 325 */ 326 327 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 328 { 329 return snprintf(buf, PAGE_SIZE, "%u %u\n", 330 sdp->sd_tune.gt_quota_scale_num, 331 sdp->sd_tune.gt_quota_scale_den); 332 } 333 334 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 335 size_t len) 336 { 337 struct gfs2_tune *gt = &sdp->sd_tune; 338 unsigned int x, y; 339 340 if (!capable(CAP_SYS_ADMIN)) 341 return -EACCES; 342 343 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 344 return -EINVAL; 345 346 spin_lock(>->gt_spin); 347 gt->gt_quota_scale_num = x; 348 gt->gt_quota_scale_den = y; 349 spin_unlock(>->gt_spin); 350 return len; 351 } 352 353 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 354 int check_zero, const char *buf, size_t len) 355 { 356 struct gfs2_tune *gt = &sdp->sd_tune; 357 unsigned int x; 358 359 if (!capable(CAP_SYS_ADMIN)) 360 return -EACCES; 361 362 x = simple_strtoul(buf, NULL, 0); 363 364 if (check_zero && !x) 365 return -EINVAL; 366 367 spin_lock(>->gt_spin); 368 *field = x; 369 spin_unlock(>->gt_spin); 370 return len; 371 } 372 373 struct tune_attr { 374 struct attribute attr; 375 ssize_t (*show)(struct gfs2_sbd *, char *); 376 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 377 }; 378 379 #define TUNE_ATTR_3(name, show, store) \ 380 static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store) 381 382 #define TUNE_ATTR_2(name, store) \ 383 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 384 { \ 385 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 386 } \ 387 TUNE_ATTR_3(name, name##_show, store) 388 389 #define TUNE_ATTR(name, check_zero) \ 390 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 391 { \ 392 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 393 } \ 394 TUNE_ATTR_2(name, name##_store) 395 396 #define TUNE_ATTR_DAEMON(name, process) \ 397 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 398 { \ 399 ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \ 400 wake_up_process(sdp->sd_##process); \ 401 return r; \ 402 } \ 403 TUNE_ATTR_2(name, name##_store) 404 405 TUNE_ATTR(demote_secs, 0); 406 TUNE_ATTR(incore_log_blocks, 0); 407 TUNE_ATTR(log_flush_secs, 0); 408 TUNE_ATTR(quota_warn_period, 0); 409 TUNE_ATTR(quota_quantum, 0); 410 TUNE_ATTR(atime_quantum, 0); 411 TUNE_ATTR(max_readahead, 0); 412 TUNE_ATTR(complain_secs, 0); 413 TUNE_ATTR(statfs_slow, 0); 414 TUNE_ATTR(new_files_jdata, 0); 415 TUNE_ATTR(quota_simul_sync, 1); 416 TUNE_ATTR(quota_cache_secs, 1); 417 TUNE_ATTR(stall_secs, 1); 418 TUNE_ATTR(statfs_quantum, 1); 419 TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process); 420 TUNE_ATTR_DAEMON(logd_secs, logd_process); 421 TUNE_ATTR_DAEMON(quotad_secs, quotad_process); 422 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 423 424 static struct attribute *tune_attrs[] = { 425 &tune_attr_demote_secs.attr, 426 &tune_attr_incore_log_blocks.attr, 427 &tune_attr_log_flush_secs.attr, 428 &tune_attr_quota_warn_period.attr, 429 &tune_attr_quota_quantum.attr, 430 &tune_attr_atime_quantum.attr, 431 &tune_attr_max_readahead.attr, 432 &tune_attr_complain_secs.attr, 433 &tune_attr_statfs_slow.attr, 434 &tune_attr_quota_simul_sync.attr, 435 &tune_attr_quota_cache_secs.attr, 436 &tune_attr_stall_secs.attr, 437 &tune_attr_statfs_quantum.attr, 438 &tune_attr_recoverd_secs.attr, 439 &tune_attr_logd_secs.attr, 440 &tune_attr_quotad_secs.attr, 441 &tune_attr_quota_scale.attr, 442 &tune_attr_new_files_jdata.attr, 443 NULL, 444 }; 445 446 static struct attribute_group lockstruct_group = { 447 .name = "lockstruct", 448 .attrs = lockstruct_attrs, 449 }; 450 451 static struct attribute_group counters_group = { 452 .name = "counters", 453 .attrs = counters_attrs, 454 }; 455 456 static struct attribute_group args_group = { 457 .name = "args", 458 .attrs = args_attrs, 459 }; 460 461 static struct attribute_group tune_group = { 462 .name = "tune", 463 .attrs = tune_attrs, 464 }; 465 466 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 467 { 468 int error; 469 470 sdp->sd_kobj.kset = gfs2_kset; 471 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 472 "%s", sdp->sd_table_name); 473 if (error) 474 goto fail; 475 476 error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group); 477 if (error) 478 goto fail_reg; 479 480 error = sysfs_create_group(&sdp->sd_kobj, &counters_group); 481 if (error) 482 goto fail_lockstruct; 483 484 error = sysfs_create_group(&sdp->sd_kobj, &args_group); 485 if (error) 486 goto fail_counters; 487 488 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 489 if (error) 490 goto fail_args; 491 492 kobject_uevent(&sdp->sd_kobj, KOBJ_ADD); 493 return 0; 494 495 fail_args: 496 sysfs_remove_group(&sdp->sd_kobj, &args_group); 497 fail_counters: 498 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 499 fail_lockstruct: 500 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 501 fail_reg: 502 kobject_put(&sdp->sd_kobj); 503 fail: 504 fs_err(sdp, "error %d adding sysfs files", error); 505 return error; 506 } 507 508 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 509 { 510 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 511 sysfs_remove_group(&sdp->sd_kobj, &args_group); 512 sysfs_remove_group(&sdp->sd_kobj, &counters_group); 513 sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group); 514 kobject_put(&sdp->sd_kobj); 515 } 516 517 int gfs2_sys_init(void) 518 { 519 gfs2_sys_margs = NULL; 520 spin_lock_init(&gfs2_sys_margs_lock); 521 gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj); 522 if (!gfs2_kset) 523 return -ENOMEM; 524 return 0; 525 } 526 527 void gfs2_sys_uninit(void) 528 { 529 kfree(gfs2_sys_margs); 530 kset_unregister(gfs2_kset); 531 } 532 533