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