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/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/module.h> 15 #include <linux/kobject.h> 16 #include <asm/uaccess.h> 17 #include <linux/gfs2_ondisk.h> 18 #include <linux/genhd.h> 19 20 #include "gfs2.h" 21 #include "incore.h" 22 #include "sys.h" 23 #include "super.h" 24 #include "glock.h" 25 #include "quota.h" 26 #include "util.h" 27 #include "glops.h" 28 29 struct gfs2_attr { 30 struct attribute attr; 31 ssize_t (*show)(struct gfs2_sbd *, char *); 32 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 33 }; 34 35 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr, 36 char *buf) 37 { 38 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 39 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 40 return a->show ? a->show(sdp, buf) : 0; 41 } 42 43 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr, 44 const char *buf, size_t len) 45 { 46 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 47 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 48 return a->store ? a->store(sdp, buf, len) : len; 49 } 50 51 static const struct sysfs_ops gfs2_attr_ops = { 52 .show = gfs2_attr_show, 53 .store = gfs2_attr_store, 54 }; 55 56 57 static struct kset *gfs2_kset; 58 59 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf) 60 { 61 return snprintf(buf, PAGE_SIZE, "%u:%u\n", 62 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev)); 63 } 64 65 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) 66 { 67 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); 68 } 69 70 static int gfs2_uuid_valid(const u8 *uuid) 71 { 72 int i; 73 74 for (i = 0; i < 16; i++) { 75 if (uuid[i]) 76 return 1; 77 } 78 return 0; 79 } 80 81 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf) 82 { 83 const u8 *uuid = sdp->sd_sb.sb_uuid; 84 buf[0] = '\0'; 85 if (!gfs2_uuid_valid(uuid)) 86 return 0; 87 return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid); 88 } 89 90 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) 91 { 92 unsigned int count; 93 94 mutex_lock(&sdp->sd_freeze_lock); 95 count = sdp->sd_freeze_count; 96 mutex_unlock(&sdp->sd_freeze_lock); 97 98 return snprintf(buf, PAGE_SIZE, "%u\n", count); 99 } 100 101 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 102 { 103 ssize_t ret = len; 104 int error = 0; 105 int n = simple_strtol(buf, NULL, 0); 106 107 if (!capable(CAP_SYS_ADMIN)) 108 return -EACCES; 109 110 switch (n) { 111 case 0: 112 gfs2_unfreeze_fs(sdp); 113 break; 114 case 1: 115 error = gfs2_freeze_fs(sdp); 116 break; 117 default: 118 ret = -EINVAL; 119 } 120 121 if (error) 122 fs_warn(sdp, "freeze %d error %d", n, error); 123 124 return ret; 125 } 126 127 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) 128 { 129 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags); 130 return snprintf(buf, PAGE_SIZE, "%u\n", b); 131 } 132 133 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 134 { 135 if (!capable(CAP_SYS_ADMIN)) 136 return -EACCES; 137 138 if (simple_strtol(buf, NULL, 0) != 1) 139 return -EINVAL; 140 141 gfs2_lm_withdraw(sdp, 142 "GFS2: fsid=%s: withdrawing from cluster at user's request\n", 143 sdp->sd_fsname); 144 return len; 145 } 146 147 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, 148 size_t len) 149 { 150 if (!capable(CAP_SYS_ADMIN)) 151 return -EACCES; 152 153 if (simple_strtol(buf, NULL, 0) != 1) 154 return -EINVAL; 155 156 gfs2_statfs_sync(sdp->sd_vfs, 0); 157 return len; 158 } 159 160 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 161 size_t len) 162 { 163 if (!capable(CAP_SYS_ADMIN)) 164 return -EACCES; 165 166 if (simple_strtol(buf, NULL, 0) != 1) 167 return -EINVAL; 168 169 gfs2_quota_sync(sdp->sd_vfs, 0, 1); 170 return len; 171 } 172 173 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 174 size_t len) 175 { 176 int error; 177 u32 id; 178 179 if (!capable(CAP_SYS_ADMIN)) 180 return -EACCES; 181 182 id = simple_strtoul(buf, NULL, 0); 183 184 error = gfs2_quota_refresh(sdp, 1, id); 185 return error ? error : len; 186 } 187 188 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 189 size_t len) 190 { 191 int error; 192 u32 id; 193 194 if (!capable(CAP_SYS_ADMIN)) 195 return -EACCES; 196 197 id = simple_strtoul(buf, NULL, 0); 198 199 error = gfs2_quota_refresh(sdp, 0, id); 200 return error ? error : len; 201 } 202 203 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 204 { 205 struct gfs2_glock *gl; 206 const struct gfs2_glock_operations *glops; 207 unsigned int glmode; 208 unsigned int gltype; 209 unsigned long long glnum; 210 char mode[16]; 211 int rv; 212 213 if (!capable(CAP_SYS_ADMIN)) 214 return -EACCES; 215 216 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum, 217 mode); 218 if (rv != 3) 219 return -EINVAL; 220 221 if (strcmp(mode, "EX") == 0) 222 glmode = LM_ST_UNLOCKED; 223 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0)) 224 glmode = LM_ST_DEFERRED; 225 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0)) 226 glmode = LM_ST_SHARED; 227 else 228 return -EINVAL; 229 230 if (gltype > LM_TYPE_JOURNAL) 231 return -EINVAL; 232 glops = gfs2_glops_list[gltype]; 233 if (glops == NULL) 234 return -EINVAL; 235 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl); 236 if (rv) 237 return rv; 238 gfs2_glock_cb(gl, glmode); 239 gfs2_glock_put(gl); 240 return len; 241 } 242 243 244 #define GFS2_ATTR(name, mode, show, store) \ 245 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 246 247 GFS2_ATTR(id, 0444, id_show, NULL); 248 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 249 GFS2_ATTR(uuid, 0444, uuid_show, NULL); 250 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 251 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 252 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 253 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 254 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 255 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 256 GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store); 257 258 static struct attribute *gfs2_attrs[] = { 259 &gfs2_attr_id.attr, 260 &gfs2_attr_fsname.attr, 261 &gfs2_attr_uuid.attr, 262 &gfs2_attr_freeze.attr, 263 &gfs2_attr_withdraw.attr, 264 &gfs2_attr_statfs_sync.attr, 265 &gfs2_attr_quota_sync.attr, 266 &gfs2_attr_quota_refresh_user.attr, 267 &gfs2_attr_quota_refresh_group.attr, 268 &gfs2_attr_demote_rq.attr, 269 NULL, 270 }; 271 272 static struct kobj_type gfs2_ktype = { 273 .default_attrs = gfs2_attrs, 274 .sysfs_ops = &gfs2_attr_ops, 275 }; 276 277 278 /* 279 * lock_module. Originally from lock_dlm 280 */ 281 282 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf) 283 { 284 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops; 285 return sprintf(buf, "%s\n", ops->lm_proto_name); 286 } 287 288 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf) 289 { 290 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 291 ssize_t ret; 292 int val = 0; 293 294 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags)) 295 val = 1; 296 ret = sprintf(buf, "%d\n", val); 297 return ret; 298 } 299 300 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 301 { 302 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 303 ssize_t ret = len; 304 int val; 305 306 val = simple_strtol(buf, NULL, 0); 307 308 if (val == 1) 309 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags); 310 else if (val == 0) { 311 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags); 312 smp_mb__after_clear_bit(); 313 gfs2_glock_thaw(sdp); 314 } else { 315 ret = -EINVAL; 316 } 317 return ret; 318 } 319 320 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) 321 { 322 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 323 return sprintf(buf, "%d\n", ls->ls_first); 324 } 325 326 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) 327 { 328 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 329 return sprintf(buf, "%d\n", ls->ls_first_done); 330 } 331 332 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 333 { 334 unsigned jid; 335 struct gfs2_jdesc *jd; 336 int rv; 337 338 rv = sscanf(buf, "%u", &jid); 339 if (rv != 1) 340 return -EINVAL; 341 342 rv = -ESHUTDOWN; 343 spin_lock(&sdp->sd_jindex_spin); 344 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) 345 goto out; 346 rv = -EBUSY; 347 if (sdp->sd_jdesc->jd_jid == jid) 348 goto out; 349 rv = -ENOENT; 350 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 351 if (jd->jd_jid != jid) 352 continue; 353 rv = slow_work_enqueue(&jd->jd_work); 354 break; 355 } 356 out: 357 spin_unlock(&sdp->sd_jindex_spin); 358 return rv ? rv : len; 359 } 360 361 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) 362 { 363 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 364 return sprintf(buf, "%d\n", ls->ls_recover_jid_done); 365 } 366 367 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) 368 { 369 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 370 return sprintf(buf, "%d\n", ls->ls_recover_jid_status); 371 } 372 373 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) 374 { 375 return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid); 376 } 377 378 #define GDLM_ATTR(_name,_mode,_show,_store) \ 379 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) 380 381 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); 382 GDLM_ATTR(block, 0644, block_show, block_store); 383 GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 384 GDLM_ATTR(jid, 0444, jid_show, NULL); 385 GDLM_ATTR(first, 0444, lkfirst_show, NULL); 386 GDLM_ATTR(first_done, 0444, first_done_show, NULL); 387 GDLM_ATTR(recover, 0600, NULL, recover_store); 388 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); 389 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); 390 391 static struct attribute *lock_module_attrs[] = { 392 &gdlm_attr_proto_name.attr, 393 &gdlm_attr_block.attr, 394 &gdlm_attr_withdraw.attr, 395 &gdlm_attr_jid.attr, 396 &gdlm_attr_first.attr, 397 &gdlm_attr_first_done.attr, 398 &gdlm_attr_recover.attr, 399 &gdlm_attr_recover_done.attr, 400 &gdlm_attr_recover_status.attr, 401 NULL, 402 }; 403 404 /* 405 * get and set struct gfs2_tune fields 406 */ 407 408 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 409 { 410 return snprintf(buf, PAGE_SIZE, "%u %u\n", 411 sdp->sd_tune.gt_quota_scale_num, 412 sdp->sd_tune.gt_quota_scale_den); 413 } 414 415 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 416 size_t len) 417 { 418 struct gfs2_tune *gt = &sdp->sd_tune; 419 unsigned int x, y; 420 421 if (!capable(CAP_SYS_ADMIN)) 422 return -EACCES; 423 424 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 425 return -EINVAL; 426 427 spin_lock(>->gt_spin); 428 gt->gt_quota_scale_num = x; 429 gt->gt_quota_scale_den = y; 430 spin_unlock(>->gt_spin); 431 return len; 432 } 433 434 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 435 int check_zero, const char *buf, size_t len) 436 { 437 struct gfs2_tune *gt = &sdp->sd_tune; 438 unsigned int x; 439 440 if (!capable(CAP_SYS_ADMIN)) 441 return -EACCES; 442 443 x = simple_strtoul(buf, NULL, 0); 444 445 if (check_zero && !x) 446 return -EINVAL; 447 448 spin_lock(>->gt_spin); 449 *field = x; 450 spin_unlock(>->gt_spin); 451 return len; 452 } 453 454 #define TUNE_ATTR_3(name, show, store) \ 455 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) 456 457 #define TUNE_ATTR_2(name, store) \ 458 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 459 { \ 460 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 461 } \ 462 TUNE_ATTR_3(name, name##_show, store) 463 464 #define TUNE_ATTR(name, check_zero) \ 465 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 466 { \ 467 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 468 } \ 469 TUNE_ATTR_2(name, name##_store) 470 471 TUNE_ATTR(incore_log_blocks, 0); 472 TUNE_ATTR(log_flush_secs, 0); 473 TUNE_ATTR(quota_warn_period, 0); 474 TUNE_ATTR(quota_quantum, 0); 475 TUNE_ATTR(max_readahead, 0); 476 TUNE_ATTR(complain_secs, 0); 477 TUNE_ATTR(statfs_slow, 0); 478 TUNE_ATTR(new_files_jdata, 0); 479 TUNE_ATTR(quota_simul_sync, 1); 480 TUNE_ATTR(statfs_quantum, 1); 481 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 482 483 static struct attribute *tune_attrs[] = { 484 &tune_attr_incore_log_blocks.attr, 485 &tune_attr_log_flush_secs.attr, 486 &tune_attr_quota_warn_period.attr, 487 &tune_attr_quota_quantum.attr, 488 &tune_attr_max_readahead.attr, 489 &tune_attr_complain_secs.attr, 490 &tune_attr_statfs_slow.attr, 491 &tune_attr_quota_simul_sync.attr, 492 &tune_attr_statfs_quantum.attr, 493 &tune_attr_quota_scale.attr, 494 &tune_attr_new_files_jdata.attr, 495 NULL, 496 }; 497 498 static struct attribute_group tune_group = { 499 .name = "tune", 500 .attrs = tune_attrs, 501 }; 502 503 static struct attribute_group lock_module_group = { 504 .name = "lock_module", 505 .attrs = lock_module_attrs, 506 }; 507 508 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 509 { 510 struct super_block *sb = sdp->sd_vfs; 511 int error; 512 char ro[20]; 513 char spectator[20]; 514 char *envp[] = { ro, spectator, NULL }; 515 516 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 517 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 518 519 sdp->sd_kobj.kset = gfs2_kset; 520 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 521 "%s", sdp->sd_table_name); 522 if (error) 523 goto fail; 524 525 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 526 if (error) 527 goto fail_reg; 528 529 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); 530 if (error) 531 goto fail_tune; 532 533 error = sysfs_create_link(&sdp->sd_kobj, 534 &disk_to_dev(sb->s_bdev->bd_disk)->kobj, 535 "device"); 536 if (error) 537 goto fail_lock_module; 538 539 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); 540 return 0; 541 542 fail_lock_module: 543 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 544 fail_tune: 545 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 546 fail_reg: 547 kobject_put(&sdp->sd_kobj); 548 fail: 549 fs_err(sdp, "error %d adding sysfs files", error); 550 return error; 551 } 552 553 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 554 { 555 sysfs_remove_link(&sdp->sd_kobj, "device"); 556 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 557 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 558 kobject_put(&sdp->sd_kobj); 559 } 560 561 static int gfs2_uevent(struct kset *kset, struct kobject *kobj, 562 struct kobj_uevent_env *env) 563 { 564 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 565 const u8 *uuid = sdp->sd_sb.sb_uuid; 566 567 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 568 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 569 if (!sdp->sd_args.ar_spectator) 570 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid); 571 if (gfs2_uuid_valid(uuid)) 572 add_uevent_var(env, "UUID=%pUB", uuid); 573 return 0; 574 } 575 576 static const struct kset_uevent_ops gfs2_uevent_ops = { 577 .uevent = gfs2_uevent, 578 }; 579 580 int gfs2_sys_init(void) 581 { 582 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 583 if (!gfs2_kset) 584 return -ENOMEM; 585 return 0; 586 } 587 588 void gfs2_sys_uninit(void) 589 { 590 kset_unregister(gfs2_kset); 591 } 592 593