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