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 glops = gfs2_glops_list[gltype]; 234 if (glops == NULL) 235 return -EINVAL; 236 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags)) 237 fs_info(sdp, "demote interface used\n"); 238 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl); 239 if (rv) 240 return rv; 241 gfs2_glock_cb(gl, glmode); 242 gfs2_glock_put(gl); 243 return len; 244 } 245 246 247 #define GFS2_ATTR(name, mode, show, store) \ 248 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 249 250 GFS2_ATTR(id, 0444, id_show, NULL); 251 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 252 GFS2_ATTR(uuid, 0444, uuid_show, NULL); 253 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 254 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 255 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 256 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 257 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 258 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 259 GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store); 260 261 static struct attribute *gfs2_attrs[] = { 262 &gfs2_attr_id.attr, 263 &gfs2_attr_fsname.attr, 264 &gfs2_attr_uuid.attr, 265 &gfs2_attr_freeze.attr, 266 &gfs2_attr_withdraw.attr, 267 &gfs2_attr_statfs_sync.attr, 268 &gfs2_attr_quota_sync.attr, 269 &gfs2_attr_quota_refresh_user.attr, 270 &gfs2_attr_quota_refresh_group.attr, 271 &gfs2_attr_demote_rq.attr, 272 NULL, 273 }; 274 275 static struct kobj_type gfs2_ktype = { 276 .default_attrs = gfs2_attrs, 277 .sysfs_ops = &gfs2_attr_ops, 278 }; 279 280 281 /* 282 * lock_module. Originally from lock_dlm 283 */ 284 285 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf) 286 { 287 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops; 288 return sprintf(buf, "%s\n", ops->lm_proto_name); 289 } 290 291 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf) 292 { 293 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 294 ssize_t ret; 295 int val = 0; 296 297 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags)) 298 val = 1; 299 ret = sprintf(buf, "%d\n", val); 300 return ret; 301 } 302 303 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 304 { 305 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 306 ssize_t ret = len; 307 int val; 308 309 val = simple_strtol(buf, NULL, 0); 310 311 if (val == 1) 312 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags); 313 else if (val == 0) { 314 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags); 315 smp_mb__after_clear_bit(); 316 gfs2_glock_thaw(sdp); 317 } else { 318 ret = -EINVAL; 319 } 320 return ret; 321 } 322 323 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) 324 { 325 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 326 return sprintf(buf, "%d\n", ls->ls_first); 327 } 328 329 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 330 { 331 unsigned first; 332 int rv; 333 334 rv = sscanf(buf, "%u", &first); 335 if (rv != 1 || first > 1) 336 return -EINVAL; 337 spin_lock(&sdp->sd_jindex_spin); 338 rv = -EBUSY; 339 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) 340 goto out; 341 rv = -EINVAL; 342 if (sdp->sd_args.ar_spectator) 343 goto out; 344 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 345 goto out; 346 sdp->sd_lockstruct.ls_first = first; 347 rv = 0; 348 out: 349 spin_unlock(&sdp->sd_jindex_spin); 350 return rv ? rv : len; 351 } 352 353 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) 354 { 355 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 356 return sprintf(buf, "%d\n", ls->ls_first_done); 357 } 358 359 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 360 { 361 unsigned jid; 362 struct gfs2_jdesc *jd; 363 int rv; 364 365 rv = sscanf(buf, "%u", &jid); 366 if (rv != 1) 367 return -EINVAL; 368 369 rv = -ESHUTDOWN; 370 spin_lock(&sdp->sd_jindex_spin); 371 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) 372 goto out; 373 rv = -EBUSY; 374 if (sdp->sd_jdesc->jd_jid == jid) 375 goto out; 376 rv = -ENOENT; 377 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 378 if (jd->jd_jid != jid) 379 continue; 380 rv = gfs2_recover_journal(jd, false); 381 break; 382 } 383 out: 384 spin_unlock(&sdp->sd_jindex_spin); 385 return rv ? rv : len; 386 } 387 388 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) 389 { 390 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 391 return sprintf(buf, "%d\n", ls->ls_recover_jid_done); 392 } 393 394 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) 395 { 396 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 397 return sprintf(buf, "%d\n", ls->ls_recover_jid_status); 398 } 399 400 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) 401 { 402 return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid); 403 } 404 405 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 406 { 407 unsigned jid; 408 int rv; 409 410 rv = sscanf(buf, "%u", &jid); 411 if (rv != 1) 412 return -EINVAL; 413 414 spin_lock(&sdp->sd_jindex_spin); 415 rv = -EINVAL; 416 if (sdp->sd_args.ar_spectator) 417 goto out; 418 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 419 goto out; 420 rv = -EBUSY; 421 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) 422 goto out; 423 sdp->sd_lockstruct.ls_jid = jid; 424 smp_mb__after_clear_bit(); 425 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID); 426 rv = 0; 427 out: 428 spin_unlock(&sdp->sd_jindex_spin); 429 return rv ? rv : len; 430 } 431 432 #define GDLM_ATTR(_name,_mode,_show,_store) \ 433 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) 434 435 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); 436 GDLM_ATTR(block, 0644, block_show, block_store); 437 GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 438 GDLM_ATTR(jid, 0644, jid_show, jid_store); 439 GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store); 440 GDLM_ATTR(first_done, 0444, first_done_show, NULL); 441 GDLM_ATTR(recover, 0600, NULL, recover_store); 442 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); 443 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); 444 445 static struct attribute *lock_module_attrs[] = { 446 &gdlm_attr_proto_name.attr, 447 &gdlm_attr_block.attr, 448 &gdlm_attr_withdraw.attr, 449 &gdlm_attr_jid.attr, 450 &gdlm_attr_first.attr, 451 &gdlm_attr_first_done.attr, 452 &gdlm_attr_recover.attr, 453 &gdlm_attr_recover_done.attr, 454 &gdlm_attr_recover_status.attr, 455 NULL, 456 }; 457 458 /* 459 * get and set struct gfs2_tune fields 460 */ 461 462 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 463 { 464 return snprintf(buf, PAGE_SIZE, "%u %u\n", 465 sdp->sd_tune.gt_quota_scale_num, 466 sdp->sd_tune.gt_quota_scale_den); 467 } 468 469 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 470 size_t len) 471 { 472 struct gfs2_tune *gt = &sdp->sd_tune; 473 unsigned int x, y; 474 475 if (!capable(CAP_SYS_ADMIN)) 476 return -EACCES; 477 478 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 479 return -EINVAL; 480 481 spin_lock(>->gt_spin); 482 gt->gt_quota_scale_num = x; 483 gt->gt_quota_scale_den = y; 484 spin_unlock(>->gt_spin); 485 return len; 486 } 487 488 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 489 int check_zero, const char *buf, size_t len) 490 { 491 struct gfs2_tune *gt = &sdp->sd_tune; 492 unsigned int x; 493 494 if (!capable(CAP_SYS_ADMIN)) 495 return -EACCES; 496 497 x = simple_strtoul(buf, NULL, 0); 498 499 if (check_zero && !x) 500 return -EINVAL; 501 502 spin_lock(>->gt_spin); 503 *field = x; 504 spin_unlock(>->gt_spin); 505 return len; 506 } 507 508 #define TUNE_ATTR_3(name, show, store) \ 509 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) 510 511 #define TUNE_ATTR_2(name, store) \ 512 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 513 { \ 514 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 515 } \ 516 TUNE_ATTR_3(name, name##_show, store) 517 518 #define TUNE_ATTR(name, check_zero) \ 519 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 520 { \ 521 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 522 } \ 523 TUNE_ATTR_2(name, name##_store) 524 525 TUNE_ATTR(quota_warn_period, 0); 526 TUNE_ATTR(quota_quantum, 0); 527 TUNE_ATTR(max_readahead, 0); 528 TUNE_ATTR(complain_secs, 0); 529 TUNE_ATTR(statfs_slow, 0); 530 TUNE_ATTR(new_files_jdata, 0); 531 TUNE_ATTR(quota_simul_sync, 1); 532 TUNE_ATTR(statfs_quantum, 1); 533 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 534 535 static struct attribute *tune_attrs[] = { 536 &tune_attr_quota_warn_period.attr, 537 &tune_attr_quota_quantum.attr, 538 &tune_attr_max_readahead.attr, 539 &tune_attr_complain_secs.attr, 540 &tune_attr_statfs_slow.attr, 541 &tune_attr_quota_simul_sync.attr, 542 &tune_attr_statfs_quantum.attr, 543 &tune_attr_quota_scale.attr, 544 &tune_attr_new_files_jdata.attr, 545 NULL, 546 }; 547 548 static struct attribute_group tune_group = { 549 .name = "tune", 550 .attrs = tune_attrs, 551 }; 552 553 static struct attribute_group lock_module_group = { 554 .name = "lock_module", 555 .attrs = lock_module_attrs, 556 }; 557 558 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 559 { 560 struct super_block *sb = sdp->sd_vfs; 561 int error; 562 char ro[20]; 563 char spectator[20]; 564 char *envp[] = { ro, spectator, NULL }; 565 566 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 567 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 568 569 sdp->sd_kobj.kset = gfs2_kset; 570 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 571 "%s", sdp->sd_table_name); 572 if (error) 573 goto fail; 574 575 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 576 if (error) 577 goto fail_reg; 578 579 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); 580 if (error) 581 goto fail_tune; 582 583 error = sysfs_create_link(&sdp->sd_kobj, 584 &disk_to_dev(sb->s_bdev->bd_disk)->kobj, 585 "device"); 586 if (error) 587 goto fail_lock_module; 588 589 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); 590 return 0; 591 592 fail_lock_module: 593 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 594 fail_tune: 595 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 596 fail_reg: 597 kobject_put(&sdp->sd_kobj); 598 fail: 599 fs_err(sdp, "error %d adding sysfs files", error); 600 return error; 601 } 602 603 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 604 { 605 sysfs_remove_link(&sdp->sd_kobj, "device"); 606 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 607 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 608 kobject_put(&sdp->sd_kobj); 609 } 610 611 static int gfs2_uevent(struct kset *kset, struct kobject *kobj, 612 struct kobj_uevent_env *env) 613 { 614 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 615 const u8 *uuid = sdp->sd_sb.sb_uuid; 616 617 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 618 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 619 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 620 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid); 621 if (gfs2_uuid_valid(uuid)) 622 add_uevent_var(env, "UUID=%pUB", uuid); 623 return 0; 624 } 625 626 static const struct kset_uevent_ops gfs2_uevent_ops = { 627 .uevent = gfs2_uevent, 628 }; 629 630 int gfs2_sys_init(void) 631 { 632 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 633 if (!gfs2_kset) 634 return -ENOMEM; 635 return 0; 636 } 637 638 void gfs2_sys_uninit(void) 639 { 640 kset_unregister(gfs2_kset); 641 } 642 643