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