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/slab.h> 12 #include <linux/spinlock.h> 13 #include <linux/completion.h> 14 #include <linux/buffer_head.h> 15 #include <linux/module.h> 16 #include <linux/kobject.h> 17 #include <asm/uaccess.h> 18 #include <linux/gfs2_ondisk.h> 19 #include <linux/genhd.h> 20 21 #include "gfs2.h" 22 #include "incore.h" 23 #include "sys.h" 24 #include "super.h" 25 #include "glock.h" 26 #include "quota.h" 27 #include "util.h" 28 #include "glops.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 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, "%02X%02X%02X%02X-%02X%02X-" 89 "%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\n", 90 uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5], 91 uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11], 92 uuid[12], uuid[13], uuid[14], uuid[15]); 93 } 94 95 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) 96 { 97 unsigned int count; 98 99 mutex_lock(&sdp->sd_freeze_lock); 100 count = sdp->sd_freeze_count; 101 mutex_unlock(&sdp->sd_freeze_lock); 102 103 return snprintf(buf, PAGE_SIZE, "%u\n", count); 104 } 105 106 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 107 { 108 ssize_t ret = len; 109 int error = 0; 110 int n = simple_strtol(buf, NULL, 0); 111 112 if (!capable(CAP_SYS_ADMIN)) 113 return -EACCES; 114 115 switch (n) { 116 case 0: 117 gfs2_unfreeze_fs(sdp); 118 break; 119 case 1: 120 error = gfs2_freeze_fs(sdp); 121 break; 122 default: 123 ret = -EINVAL; 124 } 125 126 if (error) 127 fs_warn(sdp, "freeze %d error %d", n, error); 128 129 return ret; 130 } 131 132 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) 133 { 134 unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags); 135 return snprintf(buf, PAGE_SIZE, "%u\n", b); 136 } 137 138 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 139 { 140 if (!capable(CAP_SYS_ADMIN)) 141 return -EACCES; 142 143 if (simple_strtol(buf, NULL, 0) != 1) 144 return -EINVAL; 145 146 gfs2_lm_withdraw(sdp, 147 "GFS2: fsid=%s: withdrawing from cluster at user's request\n", 148 sdp->sd_fsname); 149 return len; 150 } 151 152 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, 153 size_t len) 154 { 155 if (!capable(CAP_SYS_ADMIN)) 156 return -EACCES; 157 158 if (simple_strtol(buf, NULL, 0) != 1) 159 return -EINVAL; 160 161 gfs2_statfs_sync(sdp->sd_vfs, 0); 162 return len; 163 } 164 165 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 166 size_t len) 167 { 168 if (!capable(CAP_SYS_ADMIN)) 169 return -EACCES; 170 171 if (simple_strtol(buf, NULL, 0) != 1) 172 return -EINVAL; 173 174 gfs2_quota_sync(sdp->sd_vfs, 0); 175 return len; 176 } 177 178 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 179 size_t len) 180 { 181 int error; 182 u32 id; 183 184 if (!capable(CAP_SYS_ADMIN)) 185 return -EACCES; 186 187 id = simple_strtoul(buf, NULL, 0); 188 189 error = gfs2_quota_refresh(sdp, 1, id); 190 return error ? error : len; 191 } 192 193 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 194 size_t len) 195 { 196 int error; 197 u32 id; 198 199 if (!capable(CAP_SYS_ADMIN)) 200 return -EACCES; 201 202 id = simple_strtoul(buf, NULL, 0); 203 204 error = gfs2_quota_refresh(sdp, 0, id); 205 return error ? error : len; 206 } 207 208 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 209 { 210 struct gfs2_glock *gl; 211 const struct gfs2_glock_operations *glops; 212 unsigned int glmode; 213 unsigned int gltype; 214 unsigned long long glnum; 215 char mode[16]; 216 int rv; 217 218 if (!capable(CAP_SYS_ADMIN)) 219 return -EACCES; 220 221 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum, 222 mode); 223 if (rv != 3) 224 return -EINVAL; 225 226 if (strcmp(mode, "EX") == 0) 227 glmode = LM_ST_UNLOCKED; 228 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0)) 229 glmode = LM_ST_DEFERRED; 230 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0)) 231 glmode = LM_ST_SHARED; 232 else 233 return -EINVAL; 234 235 if (gltype > LM_TYPE_JOURNAL) 236 return -EINVAL; 237 glops = gfs2_glops_list[gltype]; 238 if (glops == NULL) 239 return -EINVAL; 240 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl); 241 if (rv) 242 return rv; 243 gfs2_glock_cb(gl, glmode); 244 gfs2_glock_put(gl); 245 return len; 246 } 247 248 249 #define GFS2_ATTR(name, mode, show, store) \ 250 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 251 252 GFS2_ATTR(id, 0444, id_show, NULL); 253 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 254 GFS2_ATTR(uuid, 0444, uuid_show, NULL); 255 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 256 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 257 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 258 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 259 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 260 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 261 GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store); 262 263 static struct attribute *gfs2_attrs[] = { 264 &gfs2_attr_id.attr, 265 &gfs2_attr_fsname.attr, 266 &gfs2_attr_uuid.attr, 267 &gfs2_attr_freeze.attr, 268 &gfs2_attr_withdraw.attr, 269 &gfs2_attr_statfs_sync.attr, 270 &gfs2_attr_quota_sync.attr, 271 &gfs2_attr_quota_refresh_user.attr, 272 &gfs2_attr_quota_refresh_group.attr, 273 &gfs2_attr_demote_rq.attr, 274 NULL, 275 }; 276 277 static struct kobj_type gfs2_ktype = { 278 .default_attrs = gfs2_attrs, 279 .sysfs_ops = &gfs2_attr_ops, 280 }; 281 282 283 /* 284 * lock_module. Originally from lock_dlm 285 */ 286 287 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf) 288 { 289 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops; 290 return sprintf(buf, "%s\n", ops->lm_proto_name); 291 } 292 293 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf) 294 { 295 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 296 ssize_t ret; 297 int val = 0; 298 299 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags)) 300 val = 1; 301 ret = sprintf(buf, "%d\n", val); 302 return ret; 303 } 304 305 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 306 { 307 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 308 ssize_t ret = len; 309 int val; 310 311 val = simple_strtol(buf, NULL, 0); 312 313 if (val == 1) 314 set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags); 315 else if (val == 0) { 316 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags); 317 smp_mb__after_clear_bit(); 318 gfs2_glock_thaw(sdp); 319 } else { 320 ret = -EINVAL; 321 } 322 return ret; 323 } 324 325 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) 326 { 327 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 328 return sprintf(buf, "%d\n", ls->ls_first); 329 } 330 331 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) 332 { 333 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 334 return sprintf(buf, "%d\n", ls->ls_first_done); 335 } 336 337 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 338 { 339 unsigned jid; 340 struct gfs2_jdesc *jd; 341 int rv; 342 343 rv = sscanf(buf, "%u", &jid); 344 if (rv != 1) 345 return -EINVAL; 346 347 rv = -ESHUTDOWN; 348 spin_lock(&sdp->sd_jindex_spin); 349 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) 350 goto out; 351 rv = -EBUSY; 352 if (sdp->sd_jdesc->jd_jid == jid) 353 goto out; 354 rv = -ENOENT; 355 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 356 if (jd->jd_jid != jid) 357 continue; 358 rv = slow_work_enqueue(&jd->jd_work); 359 break; 360 } 361 out: 362 spin_unlock(&sdp->sd_jindex_spin); 363 return rv ? rv : len; 364 } 365 366 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) 367 { 368 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 369 return sprintf(buf, "%d\n", ls->ls_recover_jid_done); 370 } 371 372 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) 373 { 374 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 375 return sprintf(buf, "%d\n", ls->ls_recover_jid_status); 376 } 377 378 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) 379 { 380 return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid); 381 } 382 383 #define GDLM_ATTR(_name,_mode,_show,_store) \ 384 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) 385 386 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); 387 GDLM_ATTR(block, 0644, block_show, block_store); 388 GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 389 GDLM_ATTR(jid, 0444, jid_show, NULL); 390 GDLM_ATTR(first, 0444, lkfirst_show, NULL); 391 GDLM_ATTR(first_done, 0444, first_done_show, NULL); 392 GDLM_ATTR(recover, 0600, NULL, recover_store); 393 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); 394 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); 395 396 static struct attribute *lock_module_attrs[] = { 397 &gdlm_attr_proto_name.attr, 398 &gdlm_attr_block.attr, 399 &gdlm_attr_withdraw.attr, 400 &gdlm_attr_jid.attr, 401 &gdlm_attr_first.attr, 402 &gdlm_attr_first_done.attr, 403 &gdlm_attr_recover.attr, 404 &gdlm_attr_recover_done.attr, 405 &gdlm_attr_recover_status.attr, 406 NULL, 407 }; 408 409 /* 410 * get and set struct gfs2_tune fields 411 */ 412 413 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 414 { 415 return snprintf(buf, PAGE_SIZE, "%u %u\n", 416 sdp->sd_tune.gt_quota_scale_num, 417 sdp->sd_tune.gt_quota_scale_den); 418 } 419 420 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 421 size_t len) 422 { 423 struct gfs2_tune *gt = &sdp->sd_tune; 424 unsigned int x, y; 425 426 if (!capable(CAP_SYS_ADMIN)) 427 return -EACCES; 428 429 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 430 return -EINVAL; 431 432 spin_lock(>->gt_spin); 433 gt->gt_quota_scale_num = x; 434 gt->gt_quota_scale_den = y; 435 spin_unlock(>->gt_spin); 436 return len; 437 } 438 439 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 440 int check_zero, const char *buf, size_t len) 441 { 442 struct gfs2_tune *gt = &sdp->sd_tune; 443 unsigned int x; 444 445 if (!capable(CAP_SYS_ADMIN)) 446 return -EACCES; 447 448 x = simple_strtoul(buf, NULL, 0); 449 450 if (check_zero && !x) 451 return -EINVAL; 452 453 spin_lock(>->gt_spin); 454 *field = x; 455 spin_unlock(>->gt_spin); 456 return len; 457 } 458 459 #define TUNE_ATTR_3(name, show, store) \ 460 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) 461 462 #define TUNE_ATTR_2(name, store) \ 463 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 464 { \ 465 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 466 } \ 467 TUNE_ATTR_3(name, name##_show, store) 468 469 #define TUNE_ATTR(name, check_zero) \ 470 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 471 { \ 472 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 473 } \ 474 TUNE_ATTR_2(name, name##_store) 475 476 TUNE_ATTR(incore_log_blocks, 0); 477 TUNE_ATTR(log_flush_secs, 0); 478 TUNE_ATTR(quota_warn_period, 0); 479 TUNE_ATTR(quota_quantum, 0); 480 TUNE_ATTR(max_readahead, 0); 481 TUNE_ATTR(complain_secs, 0); 482 TUNE_ATTR(statfs_slow, 0); 483 TUNE_ATTR(new_files_jdata, 0); 484 TUNE_ATTR(quota_simul_sync, 1); 485 TUNE_ATTR(stall_secs, 1); 486 TUNE_ATTR(statfs_quantum, 1); 487 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 488 489 static struct attribute *tune_attrs[] = { 490 &tune_attr_incore_log_blocks.attr, 491 &tune_attr_log_flush_secs.attr, 492 &tune_attr_quota_warn_period.attr, 493 &tune_attr_quota_quantum.attr, 494 &tune_attr_max_readahead.attr, 495 &tune_attr_complain_secs.attr, 496 &tune_attr_statfs_slow.attr, 497 &tune_attr_quota_simul_sync.attr, 498 &tune_attr_stall_secs.attr, 499 &tune_attr_statfs_quantum.attr, 500 &tune_attr_quota_scale.attr, 501 &tune_attr_new_files_jdata.attr, 502 NULL, 503 }; 504 505 static struct attribute_group tune_group = { 506 .name = "tune", 507 .attrs = tune_attrs, 508 }; 509 510 static struct attribute_group lock_module_group = { 511 .name = "lock_module", 512 .attrs = lock_module_attrs, 513 }; 514 515 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 516 { 517 struct super_block *sb = sdp->sd_vfs; 518 int error; 519 char ro[20]; 520 char spectator[20]; 521 char *envp[] = { ro, spectator, NULL }; 522 523 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 524 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 525 526 sdp->sd_kobj.kset = gfs2_kset; 527 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 528 "%s", sdp->sd_table_name); 529 if (error) 530 goto fail; 531 532 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 533 if (error) 534 goto fail_reg; 535 536 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); 537 if (error) 538 goto fail_tune; 539 540 error = sysfs_create_link(&sdp->sd_kobj, 541 &disk_to_dev(sb->s_bdev->bd_disk)->kobj, 542 "device"); 543 if (error) 544 goto fail_lock_module; 545 546 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); 547 return 0; 548 549 fail_lock_module: 550 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 551 fail_tune: 552 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 553 fail_reg: 554 kobject_put(&sdp->sd_kobj); 555 fail: 556 fs_err(sdp, "error %d adding sysfs files", error); 557 return error; 558 } 559 560 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 561 { 562 sysfs_remove_link(&sdp->sd_kobj, "device"); 563 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 564 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 565 kobject_put(&sdp->sd_kobj); 566 } 567 568 static int gfs2_uevent(struct kset *kset, struct kobject *kobj, 569 struct kobj_uevent_env *env) 570 { 571 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 572 const u8 *uuid = sdp->sd_sb.sb_uuid; 573 574 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 575 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 576 if (!sdp->sd_args.ar_spectator) 577 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid); 578 if (gfs2_uuid_valid(uuid)) { 579 add_uevent_var(env, "UUID=%02X%02X%02X%02X-%02X%02X-%02X%02X-" 580 "%02X%02X-%02X%02X%02X%02X%02X%02X", 581 uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], 582 uuid[5], uuid[6], uuid[7], uuid[8], uuid[9], 583 uuid[10], uuid[11], uuid[12], uuid[13], 584 uuid[14], uuid[15]); 585 } 586 return 0; 587 } 588 589 static struct kset_uevent_ops gfs2_uevent_ops = { 590 .uevent = gfs2_uevent, 591 }; 592 593 int gfs2_sys_init(void) 594 { 595 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 596 if (!gfs2_kset) 597 return -ENOMEM; 598 return 0; 599 } 600 601 void gfs2_sys_uninit(void) 602 { 603 kset_unregister(gfs2_kset); 604 } 605 606