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 #include "recovery.h" 29 30 struct gfs2_attr { 31 struct attribute attr; 32 ssize_t (*show)(struct gfs2_sbd *, char *); 33 ssize_t (*store)(struct gfs2_sbd *, const char *, size_t); 34 }; 35 36 static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr, 37 char *buf) 38 { 39 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 40 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 41 return a->show ? a->show(sdp, buf) : 0; 42 } 43 44 static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr, 45 const char *buf, size_t len) 46 { 47 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 48 struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr); 49 return a->store ? a->store(sdp, buf, len) : len; 50 } 51 52 static const struct sysfs_ops gfs2_attr_ops = { 53 .show = gfs2_attr_show, 54 .store = gfs2_attr_store, 55 }; 56 57 58 static struct kset *gfs2_kset; 59 60 static ssize_t id_show(struct gfs2_sbd *sdp, char *buf) 61 { 62 return snprintf(buf, PAGE_SIZE, "%u:%u\n", 63 MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev)); 64 } 65 66 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) 67 { 68 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); 69 } 70 71 static int gfs2_uuid_valid(const u8 *uuid) 72 { 73 int i; 74 75 for (i = 0; i < 16; i++) { 76 if (uuid[i]) 77 return 1; 78 } 79 return 0; 80 } 81 82 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf) 83 { 84 struct super_block *s = sdp->sd_vfs; 85 const u8 *uuid = s->s_uuid; 86 buf[0] = '\0'; 87 if (!gfs2_uuid_valid(uuid)) 88 return 0; 89 return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid); 90 } 91 92 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) 93 { 94 unsigned int count; 95 96 mutex_lock(&sdp->sd_freeze_lock); 97 count = sdp->sd_freeze_count; 98 mutex_unlock(&sdp->sd_freeze_lock); 99 100 return snprintf(buf, PAGE_SIZE, "%u\n", count); 101 } 102 103 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 104 { 105 ssize_t ret = len; 106 int error = 0; 107 int n = simple_strtol(buf, NULL, 0); 108 109 if (!capable(CAP_SYS_ADMIN)) 110 return -EACCES; 111 112 switch (n) { 113 case 0: 114 gfs2_unfreeze_fs(sdp); 115 break; 116 case 1: 117 error = gfs2_freeze_fs(sdp); 118 break; 119 default: 120 ret = -EINVAL; 121 } 122 123 if (error) 124 fs_warn(sdp, "freeze %d error %d", n, error); 125 126 return ret; 127 } 128 129 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) 130 { 131 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags); 132 return snprintf(buf, PAGE_SIZE, "%u\n", b); 133 } 134 135 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 136 { 137 if (!capable(CAP_SYS_ADMIN)) 138 return -EACCES; 139 140 if (simple_strtol(buf, NULL, 0) != 1) 141 return -EINVAL; 142 143 gfs2_lm_withdraw(sdp, 144 "GFS2: fsid=%s: withdrawing from cluster at user's request\n", 145 sdp->sd_fsname); 146 return len; 147 } 148 149 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, 150 size_t len) 151 { 152 if (!capable(CAP_SYS_ADMIN)) 153 return -EACCES; 154 155 if (simple_strtol(buf, NULL, 0) != 1) 156 return -EINVAL; 157 158 gfs2_statfs_sync(sdp->sd_vfs, 0); 159 return len; 160 } 161 162 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 163 size_t len) 164 { 165 if (!capable(CAP_SYS_ADMIN)) 166 return -EACCES; 167 168 if (simple_strtol(buf, NULL, 0) != 1) 169 return -EINVAL; 170 171 gfs2_quota_sync(sdp->sd_vfs, 0, 1); 172 return len; 173 } 174 175 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 176 size_t len) 177 { 178 int error; 179 u32 id; 180 181 if (!capable(CAP_SYS_ADMIN)) 182 return -EACCES; 183 184 id = simple_strtoul(buf, NULL, 0); 185 186 error = gfs2_quota_refresh(sdp, 1, id); 187 return error ? error : len; 188 } 189 190 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 191 size_t len) 192 { 193 int error; 194 u32 id; 195 196 if (!capable(CAP_SYS_ADMIN)) 197 return -EACCES; 198 199 id = simple_strtoul(buf, NULL, 0); 200 201 error = gfs2_quota_refresh(sdp, 0, id); 202 return error ? error : len; 203 } 204 205 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 206 { 207 struct gfs2_glock *gl; 208 const struct gfs2_glock_operations *glops; 209 unsigned int glmode; 210 unsigned int gltype; 211 unsigned long long glnum; 212 char mode[16]; 213 int rv; 214 215 if (!capable(CAP_SYS_ADMIN)) 216 return -EACCES; 217 218 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum, 219 mode); 220 if (rv != 3) 221 return -EINVAL; 222 223 if (strcmp(mode, "EX") == 0) 224 glmode = LM_ST_UNLOCKED; 225 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0)) 226 glmode = LM_ST_DEFERRED; 227 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0)) 228 glmode = LM_ST_SHARED; 229 else 230 return -EINVAL; 231 232 if (gltype > LM_TYPE_JOURNAL) 233 return -EINVAL; 234 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_TRANS_LOCK) 235 glops = &gfs2_trans_glops; 236 else 237 glops = gfs2_glops_list[gltype]; 238 if (glops == NULL) 239 return -EINVAL; 240 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags)) 241 fs_info(sdp, "demote interface used\n"); 242 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl); 243 if (rv) 244 return rv; 245 gfs2_glock_cb(gl, glmode); 246 gfs2_glock_put(gl); 247 return len; 248 } 249 250 251 #define GFS2_ATTR(name, mode, show, store) \ 252 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 253 254 GFS2_ATTR(id, 0444, id_show, NULL); 255 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 256 GFS2_ATTR(uuid, 0444, uuid_show, NULL); 257 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 258 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 259 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 260 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 261 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 262 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 263 GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store); 264 265 static struct attribute *gfs2_attrs[] = { 266 &gfs2_attr_id.attr, 267 &gfs2_attr_fsname.attr, 268 &gfs2_attr_uuid.attr, 269 &gfs2_attr_freeze.attr, 270 &gfs2_attr_withdraw.attr, 271 &gfs2_attr_statfs_sync.attr, 272 &gfs2_attr_quota_sync.attr, 273 &gfs2_attr_quota_refresh_user.attr, 274 &gfs2_attr_quota_refresh_group.attr, 275 &gfs2_attr_demote_rq.attr, 276 NULL, 277 }; 278 279 static struct kobj_type gfs2_ktype = { 280 .default_attrs = gfs2_attrs, 281 .sysfs_ops = &gfs2_attr_ops, 282 }; 283 284 285 /* 286 * lock_module. Originally from lock_dlm 287 */ 288 289 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf) 290 { 291 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops; 292 return sprintf(buf, "%s\n", ops->lm_proto_name); 293 } 294 295 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf) 296 { 297 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 298 ssize_t ret; 299 int val = 0; 300 301 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags)) 302 val = 1; 303 ret = sprintf(buf, "%d\n", val); 304 return ret; 305 } 306 307 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 308 { 309 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 310 ssize_t ret = len; 311 int val; 312 313 val = simple_strtol(buf, NULL, 0); 314 315 if (val == 1) 316 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags); 317 else if (val == 0) { 318 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags); 319 smp_mb__after_clear_bit(); 320 gfs2_glock_thaw(sdp); 321 } else { 322 ret = -EINVAL; 323 } 324 return ret; 325 } 326 327 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) 328 { 329 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 330 return sprintf(buf, "%d\n", ls->ls_first); 331 } 332 333 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 334 { 335 unsigned first; 336 int rv; 337 338 rv = sscanf(buf, "%u", &first); 339 if (rv != 1 || first > 1) 340 return -EINVAL; 341 rv = wait_for_completion_killable(&sdp->sd_locking_init); 342 if (rv) 343 return rv; 344 spin_lock(&sdp->sd_jindex_spin); 345 rv = -EBUSY; 346 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) 347 goto out; 348 rv = -EINVAL; 349 if (sdp->sd_args.ar_spectator) 350 goto out; 351 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 352 goto out; 353 sdp->sd_lockstruct.ls_first = first; 354 rv = 0; 355 out: 356 spin_unlock(&sdp->sd_jindex_spin); 357 return rv ? rv : len; 358 } 359 360 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) 361 { 362 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 363 return sprintf(buf, "%d\n", ls->ls_first_done); 364 } 365 366 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 367 { 368 unsigned jid; 369 struct gfs2_jdesc *jd; 370 int rv; 371 372 rv = sscanf(buf, "%u", &jid); 373 if (rv != 1) 374 return -EINVAL; 375 376 rv = -ESHUTDOWN; 377 spin_lock(&sdp->sd_jindex_spin); 378 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) 379 goto out; 380 rv = -EBUSY; 381 if (sdp->sd_jdesc->jd_jid == jid) 382 goto out; 383 rv = -ENOENT; 384 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 385 if (jd->jd_jid != jid) 386 continue; 387 rv = gfs2_recover_journal(jd, false); 388 break; 389 } 390 out: 391 spin_unlock(&sdp->sd_jindex_spin); 392 return rv ? rv : len; 393 } 394 395 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) 396 { 397 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 398 return sprintf(buf, "%d\n", ls->ls_recover_jid_done); 399 } 400 401 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) 402 { 403 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 404 return sprintf(buf, "%d\n", ls->ls_recover_jid_status); 405 } 406 407 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) 408 { 409 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid); 410 } 411 412 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 413 { 414 int jid; 415 int rv; 416 417 rv = sscanf(buf, "%d", &jid); 418 if (rv != 1) 419 return -EINVAL; 420 rv = wait_for_completion_killable(&sdp->sd_locking_init); 421 if (rv) 422 return rv; 423 spin_lock(&sdp->sd_jindex_spin); 424 rv = -EINVAL; 425 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 426 goto out; 427 rv = -EBUSY; 428 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) 429 goto out; 430 rv = 0; 431 if (sdp->sd_args.ar_spectator && jid > 0) 432 rv = jid = -EINVAL; 433 sdp->sd_lockstruct.ls_jid = jid; 434 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags); 435 smp_mb__after_clear_bit(); 436 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID); 437 out: 438 spin_unlock(&sdp->sd_jindex_spin); 439 return rv ? rv : len; 440 } 441 442 #define GDLM_ATTR(_name,_mode,_show,_store) \ 443 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) 444 445 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); 446 GDLM_ATTR(block, 0644, block_show, block_store); 447 GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 448 GDLM_ATTR(jid, 0644, jid_show, jid_store); 449 GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store); 450 GDLM_ATTR(first_done, 0444, first_done_show, NULL); 451 GDLM_ATTR(recover, 0600, NULL, recover_store); 452 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); 453 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); 454 455 static struct attribute *lock_module_attrs[] = { 456 &gdlm_attr_proto_name.attr, 457 &gdlm_attr_block.attr, 458 &gdlm_attr_withdraw.attr, 459 &gdlm_attr_jid.attr, 460 &gdlm_attr_first.attr, 461 &gdlm_attr_first_done.attr, 462 &gdlm_attr_recover.attr, 463 &gdlm_attr_recover_done.attr, 464 &gdlm_attr_recover_status.attr, 465 NULL, 466 }; 467 468 /* 469 * get and set struct gfs2_tune fields 470 */ 471 472 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 473 { 474 return snprintf(buf, PAGE_SIZE, "%u %u\n", 475 sdp->sd_tune.gt_quota_scale_num, 476 sdp->sd_tune.gt_quota_scale_den); 477 } 478 479 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 480 size_t len) 481 { 482 struct gfs2_tune *gt = &sdp->sd_tune; 483 unsigned int x, y; 484 485 if (!capable(CAP_SYS_ADMIN)) 486 return -EACCES; 487 488 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 489 return -EINVAL; 490 491 spin_lock(>->gt_spin); 492 gt->gt_quota_scale_num = x; 493 gt->gt_quota_scale_den = y; 494 spin_unlock(>->gt_spin); 495 return len; 496 } 497 498 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 499 int check_zero, const char *buf, size_t len) 500 { 501 struct gfs2_tune *gt = &sdp->sd_tune; 502 unsigned int x; 503 504 if (!capable(CAP_SYS_ADMIN)) 505 return -EACCES; 506 507 x = simple_strtoul(buf, NULL, 0); 508 509 if (check_zero && !x) 510 return -EINVAL; 511 512 spin_lock(>->gt_spin); 513 *field = x; 514 spin_unlock(>->gt_spin); 515 return len; 516 } 517 518 #define TUNE_ATTR_3(name, show, store) \ 519 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) 520 521 #define TUNE_ATTR_2(name, store) \ 522 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 523 { \ 524 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 525 } \ 526 TUNE_ATTR_3(name, name##_show, store) 527 528 #define TUNE_ATTR(name, check_zero) \ 529 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 530 { \ 531 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 532 } \ 533 TUNE_ATTR_2(name, name##_store) 534 535 TUNE_ATTR(quota_warn_period, 0); 536 TUNE_ATTR(quota_quantum, 0); 537 TUNE_ATTR(max_readahead, 0); 538 TUNE_ATTR(complain_secs, 0); 539 TUNE_ATTR(statfs_slow, 0); 540 TUNE_ATTR(new_files_jdata, 0); 541 TUNE_ATTR(quota_simul_sync, 1); 542 TUNE_ATTR(statfs_quantum, 1); 543 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 544 545 static struct attribute *tune_attrs[] = { 546 &tune_attr_quota_warn_period.attr, 547 &tune_attr_quota_quantum.attr, 548 &tune_attr_max_readahead.attr, 549 &tune_attr_complain_secs.attr, 550 &tune_attr_statfs_slow.attr, 551 &tune_attr_quota_simul_sync.attr, 552 &tune_attr_statfs_quantum.attr, 553 &tune_attr_quota_scale.attr, 554 &tune_attr_new_files_jdata.attr, 555 NULL, 556 }; 557 558 static struct attribute_group tune_group = { 559 .name = "tune", 560 .attrs = tune_attrs, 561 }; 562 563 static struct attribute_group lock_module_group = { 564 .name = "lock_module", 565 .attrs = lock_module_attrs, 566 }; 567 568 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 569 { 570 struct super_block *sb = sdp->sd_vfs; 571 int error; 572 char ro[20]; 573 char spectator[20]; 574 char *envp[] = { ro, spectator, NULL }; 575 576 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 577 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 578 579 sdp->sd_kobj.kset = gfs2_kset; 580 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 581 "%s", sdp->sd_table_name); 582 if (error) 583 goto fail; 584 585 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 586 if (error) 587 goto fail_reg; 588 589 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); 590 if (error) 591 goto fail_tune; 592 593 error = sysfs_create_link(&sdp->sd_kobj, 594 &disk_to_dev(sb->s_bdev->bd_disk)->kobj, 595 "device"); 596 if (error) 597 goto fail_lock_module; 598 599 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); 600 return 0; 601 602 fail_lock_module: 603 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 604 fail_tune: 605 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 606 fail_reg: 607 kobject_put(&sdp->sd_kobj); 608 fail: 609 fs_err(sdp, "error %d adding sysfs files", error); 610 return error; 611 } 612 613 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 614 { 615 sysfs_remove_link(&sdp->sd_kobj, "device"); 616 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 617 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 618 kobject_put(&sdp->sd_kobj); 619 } 620 621 static int gfs2_uevent(struct kset *kset, struct kobject *kobj, 622 struct kobj_uevent_env *env) 623 { 624 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 625 struct super_block *s = sdp->sd_vfs; 626 const u8 *uuid = s->s_uuid; 627 628 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 629 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 630 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 631 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid); 632 if (gfs2_uuid_valid(uuid)) 633 add_uevent_var(env, "UUID=%pUB", uuid); 634 return 0; 635 } 636 637 static const struct kset_uevent_ops gfs2_uevent_ops = { 638 .uevent = gfs2_uevent, 639 }; 640 641 int gfs2_sys_init(void) 642 { 643 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 644 if (!gfs2_kset) 645 return -ENOMEM; 646 return 0; 647 } 648 649 void gfs2_sys_uninit(void) 650 { 651 kset_unregister(gfs2_kset); 652 } 653 654