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 first_done_show(struct gfs2_sbd *sdp, char *buf) 329 { 330 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 331 return sprintf(buf, "%d\n", ls->ls_first_done); 332 } 333 334 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 335 { 336 unsigned jid; 337 struct gfs2_jdesc *jd; 338 int rv; 339 340 rv = sscanf(buf, "%u", &jid); 341 if (rv != 1) 342 return -EINVAL; 343 344 rv = -ESHUTDOWN; 345 spin_lock(&sdp->sd_jindex_spin); 346 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) 347 goto out; 348 rv = -EBUSY; 349 if (sdp->sd_jdesc->jd_jid == jid) 350 goto out; 351 rv = -ENOENT; 352 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 353 if (jd->jd_jid != jid) 354 continue; 355 rv = slow_work_enqueue(&jd->jd_work); 356 break; 357 } 358 out: 359 spin_unlock(&sdp->sd_jindex_spin); 360 return rv ? rv : len; 361 } 362 363 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) 364 { 365 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 366 return sprintf(buf, "%d\n", ls->ls_recover_jid_done); 367 } 368 369 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) 370 { 371 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 372 return sprintf(buf, "%d\n", ls->ls_recover_jid_status); 373 } 374 375 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) 376 { 377 return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid); 378 } 379 380 #define GDLM_ATTR(_name,_mode,_show,_store) \ 381 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) 382 383 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); 384 GDLM_ATTR(block, 0644, block_show, block_store); 385 GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 386 GDLM_ATTR(jid, 0444, jid_show, NULL); 387 GDLM_ATTR(first, 0444, lkfirst_show, NULL); 388 GDLM_ATTR(first_done, 0444, first_done_show, NULL); 389 GDLM_ATTR(recover, 0600, NULL, recover_store); 390 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); 391 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); 392 393 static struct attribute *lock_module_attrs[] = { 394 &gdlm_attr_proto_name.attr, 395 &gdlm_attr_block.attr, 396 &gdlm_attr_withdraw.attr, 397 &gdlm_attr_jid.attr, 398 &gdlm_attr_first.attr, 399 &gdlm_attr_first_done.attr, 400 &gdlm_attr_recover.attr, 401 &gdlm_attr_recover_done.attr, 402 &gdlm_attr_recover_status.attr, 403 NULL, 404 }; 405 406 /* 407 * get and set struct gfs2_tune fields 408 */ 409 410 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 411 { 412 return snprintf(buf, PAGE_SIZE, "%u %u\n", 413 sdp->sd_tune.gt_quota_scale_num, 414 sdp->sd_tune.gt_quota_scale_den); 415 } 416 417 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 418 size_t len) 419 { 420 struct gfs2_tune *gt = &sdp->sd_tune; 421 unsigned int x, y; 422 423 if (!capable(CAP_SYS_ADMIN)) 424 return -EACCES; 425 426 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 427 return -EINVAL; 428 429 spin_lock(>->gt_spin); 430 gt->gt_quota_scale_num = x; 431 gt->gt_quota_scale_den = y; 432 spin_unlock(>->gt_spin); 433 return len; 434 } 435 436 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 437 int check_zero, const char *buf, size_t len) 438 { 439 struct gfs2_tune *gt = &sdp->sd_tune; 440 unsigned int x; 441 442 if (!capable(CAP_SYS_ADMIN)) 443 return -EACCES; 444 445 x = simple_strtoul(buf, NULL, 0); 446 447 if (check_zero && !x) 448 return -EINVAL; 449 450 spin_lock(>->gt_spin); 451 *field = x; 452 spin_unlock(>->gt_spin); 453 return len; 454 } 455 456 #define TUNE_ATTR_3(name, show, store) \ 457 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) 458 459 #define TUNE_ATTR_2(name, store) \ 460 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 461 { \ 462 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 463 } \ 464 TUNE_ATTR_3(name, name##_show, store) 465 466 #define TUNE_ATTR(name, check_zero) \ 467 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 468 { \ 469 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 470 } \ 471 TUNE_ATTR_2(name, name##_store) 472 473 TUNE_ATTR(quota_warn_period, 0); 474 TUNE_ATTR(quota_quantum, 0); 475 TUNE_ATTR(max_readahead, 0); 476 TUNE_ATTR(complain_secs, 0); 477 TUNE_ATTR(statfs_slow, 0); 478 TUNE_ATTR(new_files_jdata, 0); 479 TUNE_ATTR(quota_simul_sync, 1); 480 TUNE_ATTR(statfs_quantum, 1); 481 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 482 483 static struct attribute *tune_attrs[] = { 484 &tune_attr_quota_warn_period.attr, 485 &tune_attr_quota_quantum.attr, 486 &tune_attr_max_readahead.attr, 487 &tune_attr_complain_secs.attr, 488 &tune_attr_statfs_slow.attr, 489 &tune_attr_quota_simul_sync.attr, 490 &tune_attr_statfs_quantum.attr, 491 &tune_attr_quota_scale.attr, 492 &tune_attr_new_files_jdata.attr, 493 NULL, 494 }; 495 496 static struct attribute_group tune_group = { 497 .name = "tune", 498 .attrs = tune_attrs, 499 }; 500 501 static struct attribute_group lock_module_group = { 502 .name = "lock_module", 503 .attrs = lock_module_attrs, 504 }; 505 506 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 507 { 508 struct super_block *sb = sdp->sd_vfs; 509 int error; 510 char ro[20]; 511 char spectator[20]; 512 char *envp[] = { ro, spectator, NULL }; 513 514 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 515 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 516 517 sdp->sd_kobj.kset = gfs2_kset; 518 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 519 "%s", sdp->sd_table_name); 520 if (error) 521 goto fail; 522 523 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 524 if (error) 525 goto fail_reg; 526 527 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); 528 if (error) 529 goto fail_tune; 530 531 error = sysfs_create_link(&sdp->sd_kobj, 532 &disk_to_dev(sb->s_bdev->bd_disk)->kobj, 533 "device"); 534 if (error) 535 goto fail_lock_module; 536 537 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); 538 return 0; 539 540 fail_lock_module: 541 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 542 fail_tune: 543 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 544 fail_reg: 545 kobject_put(&sdp->sd_kobj); 546 fail: 547 fs_err(sdp, "error %d adding sysfs files", error); 548 return error; 549 } 550 551 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 552 { 553 sysfs_remove_link(&sdp->sd_kobj, "device"); 554 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 555 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 556 kobject_put(&sdp->sd_kobj); 557 } 558 559 static int gfs2_uevent(struct kset *kset, struct kobject *kobj, 560 struct kobj_uevent_env *env) 561 { 562 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 563 const u8 *uuid = sdp->sd_sb.sb_uuid; 564 565 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 566 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 567 if (!sdp->sd_args.ar_spectator) 568 add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid); 569 if (gfs2_uuid_valid(uuid)) 570 add_uevent_var(env, "UUID=%pUB", uuid); 571 return 0; 572 } 573 574 static const struct kset_uevent_ops gfs2_uevent_ops = { 575 .uevent = gfs2_uevent, 576 }; 577 578 int gfs2_sys_init(void) 579 { 580 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 581 if (!gfs2_kset) 582 return -ENOMEM; 583 return 0; 584 } 585 586 void gfs2_sys_uninit(void) 587 { 588 kset_unregister(gfs2_kset); 589 } 590 591