1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/sched.h> 10 #include <linux/cred.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 <linux/uaccess.h> 17 #include <linux/gfs2_ondisk.h> 18 #include <linux/blkdev.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 #include "recovery.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 const 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 status_show(struct gfs2_sbd *sdp, char *buf) 67 { 68 unsigned long f = sdp->sd_flags; 69 ssize_t s; 70 71 s = snprintf(buf, PAGE_SIZE, 72 "Journal Checked: %d\n" 73 "Journal Live: %d\n" 74 "Journal ID: %d\n" 75 "Spectator: %d\n" 76 "Withdrawn: %d\n" 77 "No barriers: %d\n" 78 "No recovery: %d\n" 79 "Demote: %d\n" 80 "No Journal ID: %d\n" 81 "Mounted RO: %d\n" 82 "RO Recovery: %d\n" 83 "Skip DLM Unlock: %d\n" 84 "Force AIL Flush: %d\n" 85 "FS Freeze Initiator: %d\n" 86 "FS Frozen: %d\n" 87 "Withdrawing: %d\n" 88 "Withdraw In Prog: %d\n" 89 "Remote Withdraw: %d\n" 90 "Withdraw Recovery: %d\n" 91 "Deactivating: %d\n" 92 "sd_log_error: %d\n" 93 "sd_log_flush_lock: %d\n" 94 "sd_log_num_revoke: %u\n" 95 "sd_log_in_flight: %d\n" 96 "sd_log_blks_needed: %d\n" 97 "sd_log_blks_free: %d\n" 98 "sd_log_flush_head: %d\n" 99 "sd_log_flush_tail: %d\n" 100 "sd_log_blks_reserved: %d\n" 101 "sd_log_revokes_available: %d\n" 102 "sd_log_pinned: %d\n" 103 "sd_log_thresh1: %d\n" 104 "sd_log_thresh2: %d\n", 105 test_bit(SDF_JOURNAL_CHECKED, &f), 106 test_bit(SDF_JOURNAL_LIVE, &f), 107 (sdp->sd_jdesc ? sdp->sd_jdesc->jd_jid : 0), 108 (sdp->sd_args.ar_spectator ? 1 : 0), 109 test_bit(SDF_WITHDRAWN, &f), 110 test_bit(SDF_NOBARRIERS, &f), 111 test_bit(SDF_NORECOVERY, &f), 112 test_bit(SDF_DEMOTE, &f), 113 test_bit(SDF_NOJOURNALID, &f), 114 (sb_rdonly(sdp->sd_vfs) ? 1 : 0), 115 test_bit(SDF_RORECOVERY, &f), 116 test_bit(SDF_SKIP_DLM_UNLOCK, &f), 117 test_bit(SDF_FORCE_AIL_FLUSH, &f), 118 test_bit(SDF_FREEZE_INITIATOR, &f), 119 test_bit(SDF_FROZEN, &f), 120 test_bit(SDF_WITHDRAWING, &f), 121 test_bit(SDF_WITHDRAW_IN_PROG, &f), 122 test_bit(SDF_REMOTE_WITHDRAW, &f), 123 test_bit(SDF_WITHDRAW_RECOVERY, &f), 124 test_bit(SDF_KILL, &f), 125 sdp->sd_log_error, 126 rwsem_is_locked(&sdp->sd_log_flush_lock), 127 sdp->sd_log_num_revoke, 128 atomic_read(&sdp->sd_log_in_flight), 129 atomic_read(&sdp->sd_log_blks_needed), 130 atomic_read(&sdp->sd_log_blks_free), 131 sdp->sd_log_flush_head, 132 sdp->sd_log_flush_tail, 133 sdp->sd_log_blks_reserved, 134 atomic_read(&sdp->sd_log_revokes_available), 135 atomic_read(&sdp->sd_log_pinned), 136 atomic_read(&sdp->sd_log_thresh1), 137 atomic_read(&sdp->sd_log_thresh2)); 138 return s; 139 } 140 141 static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf) 142 { 143 return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname); 144 } 145 146 static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf) 147 { 148 struct super_block *s = sdp->sd_vfs; 149 150 buf[0] = '\0'; 151 if (uuid_is_null(&s->s_uuid)) 152 return 0; 153 return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid); 154 } 155 156 static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf) 157 { 158 struct super_block *sb = sdp->sd_vfs; 159 int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1; 160 161 return snprintf(buf, PAGE_SIZE, "%d\n", frozen); 162 } 163 164 static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 165 { 166 int error, n; 167 168 error = kstrtoint(buf, 0, &n); 169 if (error) 170 return error; 171 172 if (!capable(CAP_SYS_ADMIN)) 173 return -EPERM; 174 175 switch (n) { 176 case 0: 177 error = thaw_super(sdp->sd_vfs, FREEZE_HOLDER_USERSPACE); 178 break; 179 case 1: 180 error = freeze_super(sdp->sd_vfs, FREEZE_HOLDER_USERSPACE); 181 break; 182 default: 183 return -EINVAL; 184 } 185 186 if (error) { 187 fs_warn(sdp, "freeze %d error %d\n", n, error); 188 return error; 189 } 190 191 return len; 192 } 193 194 static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf) 195 { 196 unsigned int b = gfs2_withdrawn(sdp); 197 return snprintf(buf, PAGE_SIZE, "%u\n", b); 198 } 199 200 static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 201 { 202 int error, val; 203 204 if (!capable(CAP_SYS_ADMIN)) 205 return -EPERM; 206 207 error = kstrtoint(buf, 0, &val); 208 if (error) 209 return error; 210 211 if (val != 1) 212 return -EINVAL; 213 214 gfs2_lm(sdp, "withdrawing from cluster at user's request\n"); 215 gfs2_withdraw(sdp); 216 217 return len; 218 } 219 220 static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf, 221 size_t len) 222 { 223 int error, val; 224 225 if (!capable(CAP_SYS_ADMIN)) 226 return -EPERM; 227 228 error = kstrtoint(buf, 0, &val); 229 if (error) 230 return error; 231 232 if (val != 1) 233 return -EINVAL; 234 235 gfs2_statfs_sync(sdp->sd_vfs, 0); 236 return len; 237 } 238 239 static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf, 240 size_t len) 241 { 242 int error, val; 243 244 if (!capable(CAP_SYS_ADMIN)) 245 return -EPERM; 246 247 error = kstrtoint(buf, 0, &val); 248 if (error) 249 return error; 250 251 if (val != 1) 252 return -EINVAL; 253 254 gfs2_quota_sync(sdp->sd_vfs, 0); 255 return len; 256 } 257 258 static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf, 259 size_t len) 260 { 261 struct kqid qid; 262 int error; 263 u32 id; 264 265 if (!capable(CAP_SYS_ADMIN)) 266 return -EPERM; 267 268 error = kstrtou32(buf, 0, &id); 269 if (error) 270 return error; 271 272 qid = make_kqid(current_user_ns(), USRQUOTA, id); 273 if (!qid_valid(qid)) 274 return -EINVAL; 275 276 error = gfs2_quota_refresh(sdp, qid); 277 return error ? error : len; 278 } 279 280 static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf, 281 size_t len) 282 { 283 struct kqid qid; 284 int error; 285 u32 id; 286 287 if (!capable(CAP_SYS_ADMIN)) 288 return -EPERM; 289 290 error = kstrtou32(buf, 0, &id); 291 if (error) 292 return error; 293 294 qid = make_kqid(current_user_ns(), GRPQUOTA, id); 295 if (!qid_valid(qid)) 296 return -EINVAL; 297 298 error = gfs2_quota_refresh(sdp, qid); 299 return error ? error : len; 300 } 301 302 static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 303 { 304 struct gfs2_glock *gl; 305 const struct gfs2_glock_operations *glops; 306 unsigned int glmode; 307 unsigned int gltype; 308 unsigned long long glnum; 309 char mode[16]; 310 int rv; 311 312 if (!capable(CAP_SYS_ADMIN)) 313 return -EPERM; 314 315 rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum, 316 mode); 317 if (rv != 3) 318 return -EINVAL; 319 320 if (strcmp(mode, "EX") == 0) 321 glmode = LM_ST_UNLOCKED; 322 else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0)) 323 glmode = LM_ST_DEFERRED; 324 else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0)) 325 glmode = LM_ST_SHARED; 326 else 327 return -EINVAL; 328 329 if (gltype > LM_TYPE_JOURNAL) 330 return -EINVAL; 331 if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK) 332 glops = &gfs2_freeze_glops; 333 else 334 glops = gfs2_glops_list[gltype]; 335 if (glops == NULL) 336 return -EINVAL; 337 if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags)) 338 fs_info(sdp, "demote interface used\n"); 339 rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl); 340 if (rv) 341 return rv; 342 gfs2_glock_cb(gl, glmode); 343 gfs2_glock_put(gl); 344 return len; 345 } 346 347 348 #define GFS2_ATTR(name, mode, show, store) \ 349 static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store) 350 351 GFS2_ATTR(id, 0444, id_show, NULL); 352 GFS2_ATTR(fsname, 0444, fsname_show, NULL); 353 GFS2_ATTR(uuid, 0444, uuid_show, NULL); 354 GFS2_ATTR(freeze, 0644, freeze_show, freeze_store); 355 GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store); 356 GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store); 357 GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store); 358 GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store); 359 GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store); 360 GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store); 361 GFS2_ATTR(status, 0400, status_show, NULL); 362 363 static struct attribute *gfs2_attrs[] = { 364 &gfs2_attr_id.attr, 365 &gfs2_attr_fsname.attr, 366 &gfs2_attr_uuid.attr, 367 &gfs2_attr_freeze.attr, 368 &gfs2_attr_withdraw.attr, 369 &gfs2_attr_statfs_sync.attr, 370 &gfs2_attr_quota_sync.attr, 371 &gfs2_attr_quota_refresh_user.attr, 372 &gfs2_attr_quota_refresh_group.attr, 373 &gfs2_attr_demote_rq.attr, 374 &gfs2_attr_status.attr, 375 NULL, 376 }; 377 ATTRIBUTE_GROUPS(gfs2); 378 379 static void gfs2_sbd_release(struct kobject *kobj) 380 { 381 struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 382 383 complete(&sdp->sd_kobj_unregister); 384 } 385 386 static struct kobj_type gfs2_ktype = { 387 .release = gfs2_sbd_release, 388 .default_groups = gfs2_groups, 389 .sysfs_ops = &gfs2_attr_ops, 390 }; 391 392 393 /* 394 * lock_module. Originally from lock_dlm 395 */ 396 397 static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf) 398 { 399 const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops; 400 return sprintf(buf, "%s\n", ops->lm_proto_name); 401 } 402 403 static ssize_t block_show(struct gfs2_sbd *sdp, char *buf) 404 { 405 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 406 ssize_t ret; 407 int val = 0; 408 409 if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags)) 410 val = 1; 411 ret = sprintf(buf, "%d\n", val); 412 return ret; 413 } 414 415 static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 416 { 417 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 418 int ret, val; 419 420 ret = kstrtoint(buf, 0, &val); 421 if (ret) 422 return ret; 423 424 if (val == 1) 425 set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags); 426 else if (val == 0) { 427 clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags); 428 smp_mb__after_atomic(); 429 gfs2_glock_thaw(sdp); 430 } else { 431 return -EINVAL; 432 } 433 return len; 434 } 435 436 static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf) 437 { 438 int val = completion_done(&sdp->sd_wdack) ? 1 : 0; 439 440 return sprintf(buf, "%d\n", val); 441 } 442 443 static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 444 { 445 int ret, val; 446 447 ret = kstrtoint(buf, 0, &val); 448 if (ret) 449 return ret; 450 451 if ((val == 1) && 452 !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm")) 453 complete(&sdp->sd_wdack); 454 else 455 return -EINVAL; 456 return len; 457 } 458 459 static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) 460 { 461 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 462 return sprintf(buf, "%d\n", ls->ls_first); 463 } 464 465 static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 466 { 467 unsigned first; 468 int rv; 469 470 rv = sscanf(buf, "%u", &first); 471 if (rv != 1 || first > 1) 472 return -EINVAL; 473 rv = wait_for_completion_killable(&sdp->sd_locking_init); 474 if (rv) 475 return rv; 476 spin_lock(&sdp->sd_jindex_spin); 477 rv = -EBUSY; 478 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) 479 goto out; 480 rv = -EINVAL; 481 if (sdp->sd_args.ar_spectator) 482 goto out; 483 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 484 goto out; 485 sdp->sd_lockstruct.ls_first = first; 486 rv = 0; 487 out: 488 spin_unlock(&sdp->sd_jindex_spin); 489 return rv ? rv : len; 490 } 491 492 static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) 493 { 494 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 495 return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags)); 496 } 497 498 int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid) 499 { 500 struct gfs2_jdesc *jd; 501 int rv; 502 503 /* Wait for our primary journal to be initialized */ 504 wait_for_completion(&sdp->sd_journal_ready); 505 506 spin_lock(&sdp->sd_jindex_spin); 507 rv = -EBUSY; 508 /** 509 * If we're a spectator, we use journal0, but it's not really ours. 510 * So we need to wait for its recovery too. If we skip it we'd never 511 * queue work to the recovery workqueue, and so its completion would 512 * never clear the DFL_BLOCK_LOCKS flag, so all our locks would 513 * permanently stop working. 514 */ 515 if (!sdp->sd_jdesc) 516 goto out; 517 if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator) 518 goto out; 519 rv = -ENOENT; 520 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 521 if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator) 522 continue; 523 rv = gfs2_recover_journal(jd, false); 524 break; 525 } 526 out: 527 spin_unlock(&sdp->sd_jindex_spin); 528 return rv; 529 } 530 531 static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 532 { 533 unsigned jid; 534 int rv; 535 536 rv = sscanf(buf, "%u", &jid); 537 if (rv != 1) 538 return -EINVAL; 539 540 if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) { 541 rv = -ESHUTDOWN; 542 goto out; 543 } 544 545 rv = gfs2_recover_set(sdp, jid); 546 out: 547 return rv ? rv : len; 548 } 549 550 static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf) 551 { 552 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 553 return sprintf(buf, "%d\n", ls->ls_recover_jid_done); 554 } 555 556 static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf) 557 { 558 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 559 return sprintf(buf, "%d\n", ls->ls_recover_jid_status); 560 } 561 562 static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) 563 { 564 return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid); 565 } 566 567 static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len) 568 { 569 int jid; 570 int rv; 571 572 rv = sscanf(buf, "%d", &jid); 573 if (rv != 1) 574 return -EINVAL; 575 rv = wait_for_completion_killable(&sdp->sd_locking_init); 576 if (rv) 577 return rv; 578 spin_lock(&sdp->sd_jindex_spin); 579 rv = -EINVAL; 580 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 581 goto out; 582 rv = -EBUSY; 583 if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) 584 goto out; 585 rv = 0; 586 if (sdp->sd_args.ar_spectator && jid > 0) 587 rv = jid = -EINVAL; 588 sdp->sd_lockstruct.ls_jid = jid; 589 clear_bit(SDF_NOJOURNALID, &sdp->sd_flags); 590 smp_mb__after_atomic(); 591 wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID); 592 out: 593 spin_unlock(&sdp->sd_jindex_spin); 594 return rv ? rv : len; 595 } 596 597 #define GDLM_ATTR(_name,_mode,_show,_store) \ 598 static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) 599 600 GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); 601 GDLM_ATTR(block, 0644, block_show, block_store); 602 GDLM_ATTR(withdraw, 0644, wdack_show, wdack_store); 603 GDLM_ATTR(jid, 0644, jid_show, jid_store); 604 GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store); 605 GDLM_ATTR(first_done, 0444, first_done_show, NULL); 606 GDLM_ATTR(recover, 0600, NULL, recover_store); 607 GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); 608 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL); 609 610 static struct attribute *lock_module_attrs[] = { 611 &gdlm_attr_proto_name.attr, 612 &gdlm_attr_block.attr, 613 &gdlm_attr_withdraw.attr, 614 &gdlm_attr_jid.attr, 615 &gdlm_attr_first.attr, 616 &gdlm_attr_first_done.attr, 617 &gdlm_attr_recover.attr, 618 &gdlm_attr_recover_done.attr, 619 &gdlm_attr_recover_status.attr, 620 NULL, 621 }; 622 623 /* 624 * get and set struct gfs2_tune fields 625 */ 626 627 static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf) 628 { 629 return snprintf(buf, PAGE_SIZE, "%u %u\n", 630 sdp->sd_tune.gt_quota_scale_num, 631 sdp->sd_tune.gt_quota_scale_den); 632 } 633 634 static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf, 635 size_t len) 636 { 637 struct gfs2_tune *gt = &sdp->sd_tune; 638 unsigned int x, y; 639 640 if (!capable(CAP_SYS_ADMIN)) 641 return -EPERM; 642 643 if (sscanf(buf, "%u %u", &x, &y) != 2 || !y) 644 return -EINVAL; 645 646 spin_lock(>->gt_spin); 647 gt->gt_quota_scale_num = x; 648 gt->gt_quota_scale_den = y; 649 spin_unlock(>->gt_spin); 650 return len; 651 } 652 653 static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field, 654 int check_zero, const char *buf, size_t len) 655 { 656 struct gfs2_tune *gt = &sdp->sd_tune; 657 unsigned int x; 658 int error; 659 660 if (!capable(CAP_SYS_ADMIN)) 661 return -EPERM; 662 663 error = kstrtouint(buf, 0, &x); 664 if (error) 665 return error; 666 667 if (check_zero && !x) 668 return -EINVAL; 669 670 spin_lock(>->gt_spin); 671 *field = x; 672 spin_unlock(>->gt_spin); 673 return len; 674 } 675 676 #define TUNE_ATTR_3(name, show, store) \ 677 static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store) 678 679 #define TUNE_ATTR_2(name, store) \ 680 static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf) \ 681 { \ 682 return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \ 683 } \ 684 TUNE_ATTR_3(name, name##_show, store) 685 686 #define TUNE_ATTR(name, check_zero) \ 687 static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\ 688 { \ 689 return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \ 690 } \ 691 TUNE_ATTR_2(name, name##_store) 692 693 TUNE_ATTR(quota_warn_period, 0); 694 TUNE_ATTR(quota_quantum, 0); 695 TUNE_ATTR(max_readahead, 0); 696 TUNE_ATTR(complain_secs, 0); 697 TUNE_ATTR(statfs_slow, 0); 698 TUNE_ATTR(new_files_jdata, 0); 699 TUNE_ATTR(statfs_quantum, 1); 700 TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store); 701 702 static struct attribute *tune_attrs[] = { 703 &tune_attr_quota_warn_period.attr, 704 &tune_attr_quota_quantum.attr, 705 &tune_attr_max_readahead.attr, 706 &tune_attr_complain_secs.attr, 707 &tune_attr_statfs_slow.attr, 708 &tune_attr_statfs_quantum.attr, 709 &tune_attr_quota_scale.attr, 710 &tune_attr_new_files_jdata.attr, 711 NULL, 712 }; 713 714 static const struct attribute_group tune_group = { 715 .name = "tune", 716 .attrs = tune_attrs, 717 }; 718 719 static const struct attribute_group lock_module_group = { 720 .name = "lock_module", 721 .attrs = lock_module_attrs, 722 }; 723 724 int gfs2_sys_fs_add(struct gfs2_sbd *sdp) 725 { 726 struct super_block *sb = sdp->sd_vfs; 727 int error; 728 char ro[20]; 729 char spectator[20]; 730 char *envp[] = { ro, spectator, NULL }; 731 732 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 733 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 734 735 init_completion(&sdp->sd_kobj_unregister); 736 sdp->sd_kobj.kset = gfs2_kset; 737 error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL, 738 "%s", sdp->sd_table_name); 739 if (error) 740 goto fail_reg; 741 742 error = sysfs_create_group(&sdp->sd_kobj, &tune_group); 743 if (error) 744 goto fail_reg; 745 746 error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group); 747 if (error) 748 goto fail_tune; 749 750 error = sysfs_create_link(&sdp->sd_kobj, 751 &disk_to_dev(sb->s_bdev->bd_disk)->kobj, 752 "device"); 753 if (error) 754 goto fail_lock_module; 755 756 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp); 757 return 0; 758 759 fail_lock_module: 760 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 761 fail_tune: 762 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 763 fail_reg: 764 fs_err(sdp, "error %d adding sysfs files\n", error); 765 kobject_put(&sdp->sd_kobj); 766 wait_for_completion(&sdp->sd_kobj_unregister); 767 sb->s_fs_info = NULL; 768 return error; 769 } 770 771 void gfs2_sys_fs_del(struct gfs2_sbd *sdp) 772 { 773 sysfs_remove_link(&sdp->sd_kobj, "device"); 774 sysfs_remove_group(&sdp->sd_kobj, &tune_group); 775 sysfs_remove_group(&sdp->sd_kobj, &lock_module_group); 776 kobject_put(&sdp->sd_kobj); 777 wait_for_completion(&sdp->sd_kobj_unregister); 778 } 779 780 static int gfs2_uevent(const struct kobject *kobj, struct kobj_uevent_env *env) 781 { 782 const struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj); 783 const struct super_block *s = sdp->sd_vfs; 784 785 add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); 786 add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); 787 if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 788 add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid); 789 if (!uuid_is_null(&s->s_uuid)) 790 add_uevent_var(env, "UUID=%pUB", &s->s_uuid); 791 return 0; 792 } 793 794 static const struct kset_uevent_ops gfs2_uevent_ops = { 795 .uevent = gfs2_uevent, 796 }; 797 798 int gfs2_sys_init(void) 799 { 800 gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj); 801 if (!gfs2_kset) 802 return -ENOMEM; 803 return 0; 804 } 805 806 void gfs2_sys_uninit(void) 807 { 808 kset_unregister(gfs2_kset); 809 } 810 811