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); 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); 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 u32 id; 182 183 if (!capable(CAP_SYS_ADMIN)) 184 return -EACCES; 185 186 id = simple_strtoul(buf, NULL, 0); 187 188 gfs2_quota_refresh(sdp, 1, id); 189 return len; 190 } 191 192 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 193 size_t len) 194 { 195 u32 id; 196 197 if (!capable(CAP_SYS_ADMIN)) 198 return -EACCES; 199 200 id = simple_strtoul(buf, NULL, 0); 201 202 gfs2_quota_refresh(sdp, 0, id); 203 return len; 204 } 205 206 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 207 { 208 struct gfs2_glock *gl; 209 const struct gfs2_glock_operations *glops; 210 unsigned int glmode; 211 unsigned int gltype; 212 unsigned long long glnum; 213 char mode[16]; 214 int rv; 215 216 if (!capable(CAP_SYS_ADMIN)) 217 return -EACCES; 218 219 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum, 220 mode); 221 if (rv != 3) 222 return -EINVAL; 223 224 if (strcmp(mode, "EX") == 0) 225 glmode = LM_ST_UNLOCKED; 226 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0)) 227 glmode = LM_ST_DEFERRED; 228 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0)) 229 glmode = LM_ST_SHARED; 230 else 231 return -EINVAL; 232 233 if (gltype > LM_TYPE_JOURNAL) 234 return -EINVAL; 235 glops = gfs2_glops_list[gltype]; 236 if (glops == NULL) 237 return -EINVAL; 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 first_done_show(struct gfs2_sbd *sdp, char *buf) 330 { 331 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 332 return sprintf(buf, "%d\n", ls->ls_first_done); 333 } 334 335 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 336 { 337 unsigned jid; 338 struct gfs2_jdesc *jd; 339 int rv; 340 341 rv = sscanf(buf, "%u", &jid); 342 if (rv != 1) 343 return -EINVAL; 344 345 rv = -ESHUTDOWN; 346 spin_lock(&sdp->sd_jindex_spin); 347 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) 348 goto out; 349 rv = -EBUSY; 350 if (sdp->sd_jdesc->jd_jid == jid) 351 goto out; 352 rv = -ENOENT; 353 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 354 if (jd->jd_jid != jid) 355 continue; 356 rv = slow_work_enqueue(&jd->jd_work); 357 break; 358 } 359 out: 360 spin_unlock(&sdp->sd_jindex_spin); 361 return rv ? rv : len; 362 } 363 364 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) 365 { 366 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 367 return sprintf(buf, "%d\n", ls->ls_recover_jid_done); 368 } 369 370 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) 371 { 372 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 373 return sprintf(buf, "%d\n", ls->ls_recover_jid_status); 374 } 375 376 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) 377 { 378 return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid); 379 } 380 381 #define GDLM_ATTR(_name,_mode,_show,_store) \ 382 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) 383 384 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); 385 GDLM_ATTR(block, 0644, block_show, block_store); 386 GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 387 GDLM_ATTR(jid, 0444, jid_show, NULL); 388 GDLM_ATTR(first, 0444, lkfirst_show, NULL); 389 GDLM_ATTR(first_done, 0444, first_done_show, NULL); 390 GDLM_ATTR(recover, 0600, NULL, recover_store); 391 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); 392 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); 393 394 static struct attribute *lock_module_attrs[] = { 395 &gdlm_attr_proto_name.attr, 396 &gdlm_attr_block.attr, 397 &gdlm_attr_withdraw.attr, 398 &gdlm_attr_jid.attr, 399 &gdlm_attr_first.attr, 400 &gdlm_attr_first_done.attr, 401 &gdlm_attr_recover.attr, 402 &gdlm_attr_recover_done.attr, 403 &gdlm_attr_recover_status.attr, 404 NULL, 405 }; 406 407 /* 408 * get and set struct gfs2_tune fields 409 */ 410 411 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 412 { 413 return snprintf(buf, PAGE_SIZE, "%u %u\n", 414 sdp->sd_tune.gt_quota_scale_num, 415 sdp->sd_tune.gt_quota_scale_den); 416 } 417 418 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 419 size_t len) 420 { 421 struct gfs2_tune *gt = &sdp->sd_tune; 422 unsigned int x, y; 423 424 if (!capable(CAP_SYS_ADMIN)) 425 return -EACCES; 426 427 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 428 return -EINVAL; 429 430 spin_lock(>->gt_spin); 431 gt->gt_quota_scale_num = x; 432 gt->gt_quota_scale_den = y; 433 spin_unlock(>->gt_spin); 434 return len; 435 } 436 437 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 438 int check_zero, const char *buf, size_t len) 439 { 440 struct gfs2_tune *gt = &sdp->sd_tune; 441 unsigned int x; 442 443 if (!capable(CAP_SYS_ADMIN)) 444 return -EACCES; 445 446 x = simple_strtoul(buf, NULL, 0); 447 448 if (check_zero && !x) 449 return -EINVAL; 450 451 spin_lock(>->gt_spin); 452 *field = x; 453 spin_unlock(>->gt_spin); 454 return len; 455 } 456 457 #define TUNE_ATTR_3(name, show, store) \ 458 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) 459 460 #define TUNE_ATTR_2(name, store) \ 461 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 462 { \ 463 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 464 } \ 465 TUNE_ATTR_3(name, name##_show, store) 466 467 #define TUNE_ATTR(name, check_zero) \ 468 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 469 { \ 470 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 471 } \ 472 TUNE_ATTR_2(name, name##_store) 473 474 TUNE_ATTR(incore_log_blocks, 0); 475 TUNE_ATTR(log_flush_secs, 0); 476 TUNE_ATTR(quota_warn_period, 0); 477 TUNE_ATTR(quota_quantum, 0); 478 TUNE_ATTR(max_readahead, 0); 479 TUNE_ATTR(complain_secs, 0); 480 TUNE_ATTR(statfs_slow, 0); 481 TUNE_ATTR(new_files_jdata, 0); 482 TUNE_ATTR(quota_simul_sync, 1); 483 TUNE_ATTR(stall_secs, 1); 484 TUNE_ATTR(statfs_quantum, 1); 485 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 486 487 static struct attribute *tune_attrs[] = { 488 &tune_attr_incore_log_blocks.attr, 489 &tune_attr_log_flush_secs.attr, 490 &tune_attr_quota_warn_period.attr, 491 &tune_attr_quota_quantum.attr, 492 &tune_attr_max_readahead.attr, 493 &tune_attr_complain_secs.attr, 494 &tune_attr_statfs_slow.attr, 495 &tune_attr_quota_simul_sync.attr, 496 &tune_attr_stall_secs.attr, 497 &tune_attr_statfs_quantum.attr, 498 &tune_attr_quota_scale.attr, 499 &tune_attr_new_files_jdata.attr, 500 NULL, 501 }; 502 503 static struct attribute_group tune_group = { 504 .name = "tune", 505 .attrs = tune_attrs, 506 }; 507 508 static struct attribute_group lock_module_group = { 509 .name = "lock_module", 510 .attrs = lock_module_attrs, 511 }; 512 513 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 514 { 515 struct super_block *sb = sdp->sd_vfs; 516 int error; 517 char ro[20]; 518 char spectator[20]; 519 char *envp[] = { ro, spectator, NULL }; 520 521 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 522 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 523 524 sdp->sd_kobj.kset = gfs2_kset; 525 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 526 "%s", sdp->sd_table_name); 527 if (error) 528 goto fail; 529 530 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 531 if (error) 532 goto fail_reg; 533 534 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); 535 if (error) 536 goto fail_tune; 537 538 error = sysfs_create_link(&sdp->sd_kobj, 539 &disk_to_dev(sb->s_bdev->bd_disk)->kobj, 540 "device"); 541 if (error) 542 goto fail_lock_module; 543 544 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); 545 return 0; 546 547 fail_lock_module: 548 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 549 fail_tune: 550 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 551 fail_reg: 552 kobject_put(&sdp->sd_kobj); 553 fail: 554 fs_err(sdp, "error %d adding sysfs files", error); 555 return error; 556 } 557 558 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 559 { 560 sysfs_remove_link(&sdp->sd_kobj, "device"); 561 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 562 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 563 kobject_put(&sdp->sd_kobj); 564 } 565 566 static int gfs2_uevent(struct kset *kset, struct kobject *kobj, 567 struct kobj_uevent_env *env) 568 { 569 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 570 const u8 *uuid = sdp->sd_sb.sb_uuid; 571 572 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 573 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 574 if (!sdp->sd_args.ar_spectator) 575 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid); 576 if (gfs2_uuid_valid(uuid)) { 577 add_uevent_var(env, "UUID=%02X%02X%02X%02X-%02X%02X-%02X%02X-" 578 "%02X%02X-%02X%02X%02X%02X%02X%02X", 579 uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], 580 uuid[5], uuid[6], uuid[7], uuid[8], uuid[9], 581 uuid[10], uuid[11], uuid[12], uuid[13], 582 uuid[14], uuid[15]); 583 } 584 return 0; 585 } 586 587 static struct kset_uevent_ops gfs2_uevent_ops = { 588 .uevent = gfs2_uevent, 589 }; 590 591 int gfs2_sys_init(void) 592 { 593 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 594 if (!gfs2_kset) 595 return -ENOMEM; 596 return 0; 597 } 598 599 void gfs2_sys_uninit(void) 600 { 601 kset_unregister(gfs2_kset); 602 } 603 604