1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2011 STRATO. All rights reserved. 4 */ 5 6 #include <linux/sched.h> 7 #include <linux/pagemap.h> 8 #include <linux/writeback.h> 9 #include <linux/blkdev.h> 10 #include <linux/rbtree.h> 11 #include <linux/slab.h> 12 #include <linux/workqueue.h> 13 #include <linux/btrfs.h> 14 #include <linux/sizes.h> 15 16 #include "ctree.h" 17 #include "transaction.h" 18 #include "disk-io.h" 19 #include "locking.h" 20 #include "ulist.h" 21 #include "backref.h" 22 #include "extent_io.h" 23 #include "qgroup.h" 24 25 26 /* TODO XXX FIXME 27 * - subvol delete -> delete when ref goes to 0? delete limits also? 28 * - reorganize keys 29 * - compressed 30 * - sync 31 * - copy also limits on subvol creation 32 * - limit 33 * - caches for ulists 34 * - performance benchmarks 35 * - check all ioctl parameters 36 */ 37 38 /* 39 * Helpers to access qgroup reservation 40 * 41 * Callers should ensure the lock context and type are valid 42 */ 43 44 static u64 qgroup_rsv_total(const struct btrfs_qgroup *qgroup) 45 { 46 u64 ret = 0; 47 int i; 48 49 for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++) 50 ret += qgroup->rsv.values[i]; 51 52 return ret; 53 } 54 55 #ifdef CONFIG_BTRFS_DEBUG 56 static const char *qgroup_rsv_type_str(enum btrfs_qgroup_rsv_type type) 57 { 58 if (type == BTRFS_QGROUP_RSV_DATA) 59 return "data"; 60 if (type == BTRFS_QGROUP_RSV_META_PERTRANS) 61 return "meta_pertrans"; 62 if (type == BTRFS_QGROUP_RSV_META_PREALLOC) 63 return "meta_prealloc"; 64 return NULL; 65 } 66 #endif 67 68 static void qgroup_rsv_add(struct btrfs_fs_info *fs_info, 69 struct btrfs_qgroup *qgroup, u64 num_bytes, 70 enum btrfs_qgroup_rsv_type type) 71 { 72 trace_qgroup_update_reserve(fs_info, qgroup, num_bytes, type); 73 qgroup->rsv.values[type] += num_bytes; 74 } 75 76 static void qgroup_rsv_release(struct btrfs_fs_info *fs_info, 77 struct btrfs_qgroup *qgroup, u64 num_bytes, 78 enum btrfs_qgroup_rsv_type type) 79 { 80 trace_qgroup_update_reserve(fs_info, qgroup, -(s64)num_bytes, type); 81 if (qgroup->rsv.values[type] >= num_bytes) { 82 qgroup->rsv.values[type] -= num_bytes; 83 return; 84 } 85 #ifdef CONFIG_BTRFS_DEBUG 86 WARN_RATELIMIT(1, 87 "qgroup %llu %s reserved space underflow, have %llu to free %llu", 88 qgroup->qgroupid, qgroup_rsv_type_str(type), 89 qgroup->rsv.values[type], num_bytes); 90 #endif 91 qgroup->rsv.values[type] = 0; 92 } 93 94 static void qgroup_rsv_add_by_qgroup(struct btrfs_fs_info *fs_info, 95 struct btrfs_qgroup *dest, 96 struct btrfs_qgroup *src) 97 { 98 int i; 99 100 for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++) 101 qgroup_rsv_add(fs_info, dest, src->rsv.values[i], i); 102 } 103 104 static void qgroup_rsv_release_by_qgroup(struct btrfs_fs_info *fs_info, 105 struct btrfs_qgroup *dest, 106 struct btrfs_qgroup *src) 107 { 108 int i; 109 110 for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++) 111 qgroup_rsv_release(fs_info, dest, src->rsv.values[i], i); 112 } 113 114 static void btrfs_qgroup_update_old_refcnt(struct btrfs_qgroup *qg, u64 seq, 115 int mod) 116 { 117 if (qg->old_refcnt < seq) 118 qg->old_refcnt = seq; 119 qg->old_refcnt += mod; 120 } 121 122 static void btrfs_qgroup_update_new_refcnt(struct btrfs_qgroup *qg, u64 seq, 123 int mod) 124 { 125 if (qg->new_refcnt < seq) 126 qg->new_refcnt = seq; 127 qg->new_refcnt += mod; 128 } 129 130 static inline u64 btrfs_qgroup_get_old_refcnt(struct btrfs_qgroup *qg, u64 seq) 131 { 132 if (qg->old_refcnt < seq) 133 return 0; 134 return qg->old_refcnt - seq; 135 } 136 137 static inline u64 btrfs_qgroup_get_new_refcnt(struct btrfs_qgroup *qg, u64 seq) 138 { 139 if (qg->new_refcnt < seq) 140 return 0; 141 return qg->new_refcnt - seq; 142 } 143 144 /* 145 * glue structure to represent the relations between qgroups. 146 */ 147 struct btrfs_qgroup_list { 148 struct list_head next_group; 149 struct list_head next_member; 150 struct btrfs_qgroup *group; 151 struct btrfs_qgroup *member; 152 }; 153 154 static inline u64 qgroup_to_aux(struct btrfs_qgroup *qg) 155 { 156 return (u64)(uintptr_t)qg; 157 } 158 159 static inline struct btrfs_qgroup* unode_aux_to_qgroup(struct ulist_node *n) 160 { 161 return (struct btrfs_qgroup *)(uintptr_t)n->aux; 162 } 163 164 static int 165 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid, 166 int init_flags); 167 static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info); 168 169 /* must be called with qgroup_ioctl_lock held */ 170 static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info, 171 u64 qgroupid) 172 { 173 struct rb_node *n = fs_info->qgroup_tree.rb_node; 174 struct btrfs_qgroup *qgroup; 175 176 while (n) { 177 qgroup = rb_entry(n, struct btrfs_qgroup, node); 178 if (qgroup->qgroupid < qgroupid) 179 n = n->rb_left; 180 else if (qgroup->qgroupid > qgroupid) 181 n = n->rb_right; 182 else 183 return qgroup; 184 } 185 return NULL; 186 } 187 188 /* must be called with qgroup_lock held */ 189 static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info, 190 u64 qgroupid) 191 { 192 struct rb_node **p = &fs_info->qgroup_tree.rb_node; 193 struct rb_node *parent = NULL; 194 struct btrfs_qgroup *qgroup; 195 196 while (*p) { 197 parent = *p; 198 qgroup = rb_entry(parent, struct btrfs_qgroup, node); 199 200 if (qgroup->qgroupid < qgroupid) 201 p = &(*p)->rb_left; 202 else if (qgroup->qgroupid > qgroupid) 203 p = &(*p)->rb_right; 204 else 205 return qgroup; 206 } 207 208 qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC); 209 if (!qgroup) 210 return ERR_PTR(-ENOMEM); 211 212 qgroup->qgroupid = qgroupid; 213 INIT_LIST_HEAD(&qgroup->groups); 214 INIT_LIST_HEAD(&qgroup->members); 215 INIT_LIST_HEAD(&qgroup->dirty); 216 217 rb_link_node(&qgroup->node, parent, p); 218 rb_insert_color(&qgroup->node, &fs_info->qgroup_tree); 219 220 return qgroup; 221 } 222 223 static void __del_qgroup_rb(struct btrfs_qgroup *qgroup) 224 { 225 struct btrfs_qgroup_list *list; 226 227 list_del(&qgroup->dirty); 228 while (!list_empty(&qgroup->groups)) { 229 list = list_first_entry(&qgroup->groups, 230 struct btrfs_qgroup_list, next_group); 231 list_del(&list->next_group); 232 list_del(&list->next_member); 233 kfree(list); 234 } 235 236 while (!list_empty(&qgroup->members)) { 237 list = list_first_entry(&qgroup->members, 238 struct btrfs_qgroup_list, next_member); 239 list_del(&list->next_group); 240 list_del(&list->next_member); 241 kfree(list); 242 } 243 kfree(qgroup); 244 } 245 246 /* must be called with qgroup_lock held */ 247 static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid) 248 { 249 struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid); 250 251 if (!qgroup) 252 return -ENOENT; 253 254 rb_erase(&qgroup->node, &fs_info->qgroup_tree); 255 __del_qgroup_rb(qgroup); 256 return 0; 257 } 258 259 /* must be called with qgroup_lock held */ 260 static int add_relation_rb(struct btrfs_fs_info *fs_info, 261 u64 memberid, u64 parentid) 262 { 263 struct btrfs_qgroup *member; 264 struct btrfs_qgroup *parent; 265 struct btrfs_qgroup_list *list; 266 267 member = find_qgroup_rb(fs_info, memberid); 268 parent = find_qgroup_rb(fs_info, parentid); 269 if (!member || !parent) 270 return -ENOENT; 271 272 list = kzalloc(sizeof(*list), GFP_ATOMIC); 273 if (!list) 274 return -ENOMEM; 275 276 list->group = parent; 277 list->member = member; 278 list_add_tail(&list->next_group, &member->groups); 279 list_add_tail(&list->next_member, &parent->members); 280 281 return 0; 282 } 283 284 /* must be called with qgroup_lock held */ 285 static int del_relation_rb(struct btrfs_fs_info *fs_info, 286 u64 memberid, u64 parentid) 287 { 288 struct btrfs_qgroup *member; 289 struct btrfs_qgroup *parent; 290 struct btrfs_qgroup_list *list; 291 292 member = find_qgroup_rb(fs_info, memberid); 293 parent = find_qgroup_rb(fs_info, parentid); 294 if (!member || !parent) 295 return -ENOENT; 296 297 list_for_each_entry(list, &member->groups, next_group) { 298 if (list->group == parent) { 299 list_del(&list->next_group); 300 list_del(&list->next_member); 301 kfree(list); 302 return 0; 303 } 304 } 305 return -ENOENT; 306 } 307 308 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 309 int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid, 310 u64 rfer, u64 excl) 311 { 312 struct btrfs_qgroup *qgroup; 313 314 qgroup = find_qgroup_rb(fs_info, qgroupid); 315 if (!qgroup) 316 return -EINVAL; 317 if (qgroup->rfer != rfer || qgroup->excl != excl) 318 return -EINVAL; 319 return 0; 320 } 321 #endif 322 323 /* 324 * The full config is read in one go, only called from open_ctree() 325 * It doesn't use any locking, as at this point we're still single-threaded 326 */ 327 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info) 328 { 329 struct btrfs_key key; 330 struct btrfs_key found_key; 331 struct btrfs_root *quota_root = fs_info->quota_root; 332 struct btrfs_path *path = NULL; 333 struct extent_buffer *l; 334 int slot; 335 int ret = 0; 336 u64 flags = 0; 337 u64 rescan_progress = 0; 338 339 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 340 return 0; 341 342 fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL); 343 if (!fs_info->qgroup_ulist) { 344 ret = -ENOMEM; 345 goto out; 346 } 347 348 path = btrfs_alloc_path(); 349 if (!path) { 350 ret = -ENOMEM; 351 goto out; 352 } 353 354 /* default this to quota off, in case no status key is found */ 355 fs_info->qgroup_flags = 0; 356 357 /* 358 * pass 1: read status, all qgroup infos and limits 359 */ 360 key.objectid = 0; 361 key.type = 0; 362 key.offset = 0; 363 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1); 364 if (ret) 365 goto out; 366 367 while (1) { 368 struct btrfs_qgroup *qgroup; 369 370 slot = path->slots[0]; 371 l = path->nodes[0]; 372 btrfs_item_key_to_cpu(l, &found_key, slot); 373 374 if (found_key.type == BTRFS_QGROUP_STATUS_KEY) { 375 struct btrfs_qgroup_status_item *ptr; 376 377 ptr = btrfs_item_ptr(l, slot, 378 struct btrfs_qgroup_status_item); 379 380 if (btrfs_qgroup_status_version(l, ptr) != 381 BTRFS_QGROUP_STATUS_VERSION) { 382 btrfs_err(fs_info, 383 "old qgroup version, quota disabled"); 384 goto out; 385 } 386 if (btrfs_qgroup_status_generation(l, ptr) != 387 fs_info->generation) { 388 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 389 btrfs_err(fs_info, 390 "qgroup generation mismatch, marked as inconsistent"); 391 } 392 fs_info->qgroup_flags = btrfs_qgroup_status_flags(l, 393 ptr); 394 rescan_progress = btrfs_qgroup_status_rescan(l, ptr); 395 goto next1; 396 } 397 398 if (found_key.type != BTRFS_QGROUP_INFO_KEY && 399 found_key.type != BTRFS_QGROUP_LIMIT_KEY) 400 goto next1; 401 402 qgroup = find_qgroup_rb(fs_info, found_key.offset); 403 if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) || 404 (!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) { 405 btrfs_err(fs_info, "inconsistent qgroup config"); 406 flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 407 } 408 if (!qgroup) { 409 qgroup = add_qgroup_rb(fs_info, found_key.offset); 410 if (IS_ERR(qgroup)) { 411 ret = PTR_ERR(qgroup); 412 goto out; 413 } 414 } 415 switch (found_key.type) { 416 case BTRFS_QGROUP_INFO_KEY: { 417 struct btrfs_qgroup_info_item *ptr; 418 419 ptr = btrfs_item_ptr(l, slot, 420 struct btrfs_qgroup_info_item); 421 qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr); 422 qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr); 423 qgroup->excl = btrfs_qgroup_info_excl(l, ptr); 424 qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr); 425 /* generation currently unused */ 426 break; 427 } 428 case BTRFS_QGROUP_LIMIT_KEY: { 429 struct btrfs_qgroup_limit_item *ptr; 430 431 ptr = btrfs_item_ptr(l, slot, 432 struct btrfs_qgroup_limit_item); 433 qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr); 434 qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr); 435 qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr); 436 qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr); 437 qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr); 438 break; 439 } 440 } 441 next1: 442 ret = btrfs_next_item(quota_root, path); 443 if (ret < 0) 444 goto out; 445 if (ret) 446 break; 447 } 448 btrfs_release_path(path); 449 450 /* 451 * pass 2: read all qgroup relations 452 */ 453 key.objectid = 0; 454 key.type = BTRFS_QGROUP_RELATION_KEY; 455 key.offset = 0; 456 ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0); 457 if (ret) 458 goto out; 459 while (1) { 460 slot = path->slots[0]; 461 l = path->nodes[0]; 462 btrfs_item_key_to_cpu(l, &found_key, slot); 463 464 if (found_key.type != BTRFS_QGROUP_RELATION_KEY) 465 goto next2; 466 467 if (found_key.objectid > found_key.offset) { 468 /* parent <- member, not needed to build config */ 469 /* FIXME should we omit the key completely? */ 470 goto next2; 471 } 472 473 ret = add_relation_rb(fs_info, found_key.objectid, 474 found_key.offset); 475 if (ret == -ENOENT) { 476 btrfs_warn(fs_info, 477 "orphan qgroup relation 0x%llx->0x%llx", 478 found_key.objectid, found_key.offset); 479 ret = 0; /* ignore the error */ 480 } 481 if (ret) 482 goto out; 483 next2: 484 ret = btrfs_next_item(quota_root, path); 485 if (ret < 0) 486 goto out; 487 if (ret) 488 break; 489 } 490 out: 491 fs_info->qgroup_flags |= flags; 492 if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) 493 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags); 494 else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN && 495 ret >= 0) 496 ret = qgroup_rescan_init(fs_info, rescan_progress, 0); 497 btrfs_free_path(path); 498 499 if (ret < 0) { 500 ulist_free(fs_info->qgroup_ulist); 501 fs_info->qgroup_ulist = NULL; 502 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN; 503 } 504 505 return ret < 0 ? ret : 0; 506 } 507 508 /* 509 * This is called from close_ctree() or open_ctree() or btrfs_quota_disable(), 510 * first two are in single-threaded paths.And for the third one, we have set 511 * quota_root to be null with qgroup_lock held before, so it is safe to clean 512 * up the in-memory structures without qgroup_lock held. 513 */ 514 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info) 515 { 516 struct rb_node *n; 517 struct btrfs_qgroup *qgroup; 518 519 while ((n = rb_first(&fs_info->qgroup_tree))) { 520 qgroup = rb_entry(n, struct btrfs_qgroup, node); 521 rb_erase(n, &fs_info->qgroup_tree); 522 __del_qgroup_rb(qgroup); 523 } 524 /* 525 * We call btrfs_free_qgroup_config() when unmounting 526 * filesystem and disabling quota, so we set qgroup_ulist 527 * to be null here to avoid double free. 528 */ 529 ulist_free(fs_info->qgroup_ulist); 530 fs_info->qgroup_ulist = NULL; 531 } 532 533 static int add_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src, 534 u64 dst) 535 { 536 int ret; 537 struct btrfs_root *quota_root = trans->fs_info->quota_root; 538 struct btrfs_path *path; 539 struct btrfs_key key; 540 541 path = btrfs_alloc_path(); 542 if (!path) 543 return -ENOMEM; 544 545 key.objectid = src; 546 key.type = BTRFS_QGROUP_RELATION_KEY; 547 key.offset = dst; 548 549 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0); 550 551 btrfs_mark_buffer_dirty(path->nodes[0]); 552 553 btrfs_free_path(path); 554 return ret; 555 } 556 557 static int del_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src, 558 u64 dst) 559 { 560 int ret; 561 struct btrfs_root *quota_root = trans->fs_info->quota_root; 562 struct btrfs_path *path; 563 struct btrfs_key key; 564 565 path = btrfs_alloc_path(); 566 if (!path) 567 return -ENOMEM; 568 569 key.objectid = src; 570 key.type = BTRFS_QGROUP_RELATION_KEY; 571 key.offset = dst; 572 573 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); 574 if (ret < 0) 575 goto out; 576 577 if (ret > 0) { 578 ret = -ENOENT; 579 goto out; 580 } 581 582 ret = btrfs_del_item(trans, quota_root, path); 583 out: 584 btrfs_free_path(path); 585 return ret; 586 } 587 588 static int add_qgroup_item(struct btrfs_trans_handle *trans, 589 struct btrfs_root *quota_root, u64 qgroupid) 590 { 591 int ret; 592 struct btrfs_path *path; 593 struct btrfs_qgroup_info_item *qgroup_info; 594 struct btrfs_qgroup_limit_item *qgroup_limit; 595 struct extent_buffer *leaf; 596 struct btrfs_key key; 597 598 if (btrfs_is_testing(quota_root->fs_info)) 599 return 0; 600 601 path = btrfs_alloc_path(); 602 if (!path) 603 return -ENOMEM; 604 605 key.objectid = 0; 606 key.type = BTRFS_QGROUP_INFO_KEY; 607 key.offset = qgroupid; 608 609 /* 610 * Avoid a transaction abort by catching -EEXIST here. In that 611 * case, we proceed by re-initializing the existing structure 612 * on disk. 613 */ 614 615 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 616 sizeof(*qgroup_info)); 617 if (ret && ret != -EEXIST) 618 goto out; 619 620 leaf = path->nodes[0]; 621 qgroup_info = btrfs_item_ptr(leaf, path->slots[0], 622 struct btrfs_qgroup_info_item); 623 btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid); 624 btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0); 625 btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0); 626 btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0); 627 btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0); 628 629 btrfs_mark_buffer_dirty(leaf); 630 631 btrfs_release_path(path); 632 633 key.type = BTRFS_QGROUP_LIMIT_KEY; 634 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 635 sizeof(*qgroup_limit)); 636 if (ret && ret != -EEXIST) 637 goto out; 638 639 leaf = path->nodes[0]; 640 qgroup_limit = btrfs_item_ptr(leaf, path->slots[0], 641 struct btrfs_qgroup_limit_item); 642 btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0); 643 btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0); 644 btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0); 645 btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0); 646 btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0); 647 648 btrfs_mark_buffer_dirty(leaf); 649 650 ret = 0; 651 out: 652 btrfs_free_path(path); 653 return ret; 654 } 655 656 static int del_qgroup_item(struct btrfs_trans_handle *trans, u64 qgroupid) 657 { 658 int ret; 659 struct btrfs_root *quota_root = trans->fs_info->quota_root; 660 struct btrfs_path *path; 661 struct btrfs_key key; 662 663 path = btrfs_alloc_path(); 664 if (!path) 665 return -ENOMEM; 666 667 key.objectid = 0; 668 key.type = BTRFS_QGROUP_INFO_KEY; 669 key.offset = qgroupid; 670 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); 671 if (ret < 0) 672 goto out; 673 674 if (ret > 0) { 675 ret = -ENOENT; 676 goto out; 677 } 678 679 ret = btrfs_del_item(trans, quota_root, path); 680 if (ret) 681 goto out; 682 683 btrfs_release_path(path); 684 685 key.type = BTRFS_QGROUP_LIMIT_KEY; 686 ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); 687 if (ret < 0) 688 goto out; 689 690 if (ret > 0) { 691 ret = -ENOENT; 692 goto out; 693 } 694 695 ret = btrfs_del_item(trans, quota_root, path); 696 697 out: 698 btrfs_free_path(path); 699 return ret; 700 } 701 702 static int update_qgroup_limit_item(struct btrfs_trans_handle *trans, 703 struct btrfs_qgroup *qgroup) 704 { 705 struct btrfs_root *quota_root = trans->fs_info->quota_root; 706 struct btrfs_path *path; 707 struct btrfs_key key; 708 struct extent_buffer *l; 709 struct btrfs_qgroup_limit_item *qgroup_limit; 710 int ret; 711 int slot; 712 713 key.objectid = 0; 714 key.type = BTRFS_QGROUP_LIMIT_KEY; 715 key.offset = qgroup->qgroupid; 716 717 path = btrfs_alloc_path(); 718 if (!path) 719 return -ENOMEM; 720 721 ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1); 722 if (ret > 0) 723 ret = -ENOENT; 724 725 if (ret) 726 goto out; 727 728 l = path->nodes[0]; 729 slot = path->slots[0]; 730 qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item); 731 btrfs_set_qgroup_limit_flags(l, qgroup_limit, qgroup->lim_flags); 732 btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, qgroup->max_rfer); 733 btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, qgroup->max_excl); 734 btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, qgroup->rsv_rfer); 735 btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, qgroup->rsv_excl); 736 737 btrfs_mark_buffer_dirty(l); 738 739 out: 740 btrfs_free_path(path); 741 return ret; 742 } 743 744 static int update_qgroup_info_item(struct btrfs_trans_handle *trans, 745 struct btrfs_qgroup *qgroup) 746 { 747 struct btrfs_fs_info *fs_info = trans->fs_info; 748 struct btrfs_root *quota_root = fs_info->quota_root; 749 struct btrfs_path *path; 750 struct btrfs_key key; 751 struct extent_buffer *l; 752 struct btrfs_qgroup_info_item *qgroup_info; 753 int ret; 754 int slot; 755 756 if (btrfs_is_testing(fs_info)) 757 return 0; 758 759 key.objectid = 0; 760 key.type = BTRFS_QGROUP_INFO_KEY; 761 key.offset = qgroup->qgroupid; 762 763 path = btrfs_alloc_path(); 764 if (!path) 765 return -ENOMEM; 766 767 ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1); 768 if (ret > 0) 769 ret = -ENOENT; 770 771 if (ret) 772 goto out; 773 774 l = path->nodes[0]; 775 slot = path->slots[0]; 776 qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item); 777 btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid); 778 btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer); 779 btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr); 780 btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl); 781 btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr); 782 783 btrfs_mark_buffer_dirty(l); 784 785 out: 786 btrfs_free_path(path); 787 return ret; 788 } 789 790 static int update_qgroup_status_item(struct btrfs_trans_handle *trans) 791 { 792 struct btrfs_fs_info *fs_info = trans->fs_info; 793 struct btrfs_root *quota_root = fs_info->quota_root; 794 struct btrfs_path *path; 795 struct btrfs_key key; 796 struct extent_buffer *l; 797 struct btrfs_qgroup_status_item *ptr; 798 int ret; 799 int slot; 800 801 key.objectid = 0; 802 key.type = BTRFS_QGROUP_STATUS_KEY; 803 key.offset = 0; 804 805 path = btrfs_alloc_path(); 806 if (!path) 807 return -ENOMEM; 808 809 ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1); 810 if (ret > 0) 811 ret = -ENOENT; 812 813 if (ret) 814 goto out; 815 816 l = path->nodes[0]; 817 slot = path->slots[0]; 818 ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item); 819 btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags); 820 btrfs_set_qgroup_status_generation(l, ptr, trans->transid); 821 btrfs_set_qgroup_status_rescan(l, ptr, 822 fs_info->qgroup_rescan_progress.objectid); 823 824 btrfs_mark_buffer_dirty(l); 825 826 out: 827 btrfs_free_path(path); 828 return ret; 829 } 830 831 /* 832 * called with qgroup_lock held 833 */ 834 static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans, 835 struct btrfs_root *root) 836 { 837 struct btrfs_path *path; 838 struct btrfs_key key; 839 struct extent_buffer *leaf = NULL; 840 int ret; 841 int nr = 0; 842 843 path = btrfs_alloc_path(); 844 if (!path) 845 return -ENOMEM; 846 847 path->leave_spinning = 1; 848 849 key.objectid = 0; 850 key.offset = 0; 851 key.type = 0; 852 853 while (1) { 854 ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 855 if (ret < 0) 856 goto out; 857 leaf = path->nodes[0]; 858 nr = btrfs_header_nritems(leaf); 859 if (!nr) 860 break; 861 /* 862 * delete the leaf one by one 863 * since the whole tree is going 864 * to be deleted. 865 */ 866 path->slots[0] = 0; 867 ret = btrfs_del_items(trans, root, path, 0, nr); 868 if (ret) 869 goto out; 870 871 btrfs_release_path(path); 872 } 873 ret = 0; 874 out: 875 btrfs_free_path(path); 876 return ret; 877 } 878 879 int btrfs_quota_enable(struct btrfs_fs_info *fs_info) 880 { 881 struct btrfs_root *quota_root; 882 struct btrfs_root *tree_root = fs_info->tree_root; 883 struct btrfs_path *path = NULL; 884 struct btrfs_qgroup_status_item *ptr; 885 struct extent_buffer *leaf; 886 struct btrfs_key key; 887 struct btrfs_key found_key; 888 struct btrfs_qgroup *qgroup = NULL; 889 struct btrfs_trans_handle *trans = NULL; 890 int ret = 0; 891 int slot; 892 893 mutex_lock(&fs_info->qgroup_ioctl_lock); 894 if (fs_info->quota_root) 895 goto out; 896 897 fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL); 898 if (!fs_info->qgroup_ulist) { 899 ret = -ENOMEM; 900 goto out; 901 } 902 903 /* 904 * 1 for quota root item 905 * 1 for BTRFS_QGROUP_STATUS item 906 * 907 * Yet we also need 2*n items for a QGROUP_INFO/QGROUP_LIMIT items 908 * per subvolume. However those are not currently reserved since it 909 * would be a lot of overkill. 910 */ 911 trans = btrfs_start_transaction(tree_root, 2); 912 if (IS_ERR(trans)) { 913 ret = PTR_ERR(trans); 914 trans = NULL; 915 goto out; 916 } 917 918 /* 919 * initially create the quota tree 920 */ 921 quota_root = btrfs_create_tree(trans, fs_info, 922 BTRFS_QUOTA_TREE_OBJECTID); 923 if (IS_ERR(quota_root)) { 924 ret = PTR_ERR(quota_root); 925 btrfs_abort_transaction(trans, ret); 926 goto out; 927 } 928 929 path = btrfs_alloc_path(); 930 if (!path) { 931 ret = -ENOMEM; 932 btrfs_abort_transaction(trans, ret); 933 goto out_free_root; 934 } 935 936 key.objectid = 0; 937 key.type = BTRFS_QGROUP_STATUS_KEY; 938 key.offset = 0; 939 940 ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 941 sizeof(*ptr)); 942 if (ret) { 943 btrfs_abort_transaction(trans, ret); 944 goto out_free_path; 945 } 946 947 leaf = path->nodes[0]; 948 ptr = btrfs_item_ptr(leaf, path->slots[0], 949 struct btrfs_qgroup_status_item); 950 btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid); 951 btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION); 952 fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON | 953 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 954 btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags); 955 btrfs_set_qgroup_status_rescan(leaf, ptr, 0); 956 957 btrfs_mark_buffer_dirty(leaf); 958 959 key.objectid = 0; 960 key.type = BTRFS_ROOT_REF_KEY; 961 key.offset = 0; 962 963 btrfs_release_path(path); 964 ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0); 965 if (ret > 0) 966 goto out_add_root; 967 if (ret < 0) { 968 btrfs_abort_transaction(trans, ret); 969 goto out_free_path; 970 } 971 972 while (1) { 973 slot = path->slots[0]; 974 leaf = path->nodes[0]; 975 btrfs_item_key_to_cpu(leaf, &found_key, slot); 976 977 if (found_key.type == BTRFS_ROOT_REF_KEY) { 978 ret = add_qgroup_item(trans, quota_root, 979 found_key.offset); 980 if (ret) { 981 btrfs_abort_transaction(trans, ret); 982 goto out_free_path; 983 } 984 985 qgroup = add_qgroup_rb(fs_info, found_key.offset); 986 if (IS_ERR(qgroup)) { 987 ret = PTR_ERR(qgroup); 988 btrfs_abort_transaction(trans, ret); 989 goto out_free_path; 990 } 991 } 992 ret = btrfs_next_item(tree_root, path); 993 if (ret < 0) { 994 btrfs_abort_transaction(trans, ret); 995 goto out_free_path; 996 } 997 if (ret) 998 break; 999 } 1000 1001 out_add_root: 1002 btrfs_release_path(path); 1003 ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID); 1004 if (ret) { 1005 btrfs_abort_transaction(trans, ret); 1006 goto out_free_path; 1007 } 1008 1009 qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID); 1010 if (IS_ERR(qgroup)) { 1011 ret = PTR_ERR(qgroup); 1012 btrfs_abort_transaction(trans, ret); 1013 goto out_free_path; 1014 } 1015 1016 ret = btrfs_commit_transaction(trans); 1017 trans = NULL; 1018 if (ret) 1019 goto out_free_path; 1020 1021 /* 1022 * Set quota enabled flag after committing the transaction, to avoid 1023 * deadlocks on fs_info->qgroup_ioctl_lock with concurrent snapshot 1024 * creation. 1025 */ 1026 spin_lock(&fs_info->qgroup_lock); 1027 fs_info->quota_root = quota_root; 1028 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags); 1029 spin_unlock(&fs_info->qgroup_lock); 1030 1031 ret = qgroup_rescan_init(fs_info, 0, 1); 1032 if (!ret) { 1033 qgroup_rescan_zero_tracking(fs_info); 1034 btrfs_queue_work(fs_info->qgroup_rescan_workers, 1035 &fs_info->qgroup_rescan_work); 1036 } 1037 1038 out_free_path: 1039 btrfs_free_path(path); 1040 out_free_root: 1041 if (ret) { 1042 free_extent_buffer(quota_root->node); 1043 free_extent_buffer(quota_root->commit_root); 1044 kfree(quota_root); 1045 } 1046 out: 1047 if (ret) { 1048 ulist_free(fs_info->qgroup_ulist); 1049 fs_info->qgroup_ulist = NULL; 1050 if (trans) 1051 btrfs_end_transaction(trans); 1052 } 1053 mutex_unlock(&fs_info->qgroup_ioctl_lock); 1054 return ret; 1055 } 1056 1057 int btrfs_quota_disable(struct btrfs_fs_info *fs_info) 1058 { 1059 struct btrfs_root *quota_root; 1060 struct btrfs_trans_handle *trans = NULL; 1061 int ret = 0; 1062 1063 mutex_lock(&fs_info->qgroup_ioctl_lock); 1064 if (!fs_info->quota_root) 1065 goto out; 1066 1067 /* 1068 * 1 For the root item 1069 * 1070 * We should also reserve enough items for the quota tree deletion in 1071 * btrfs_clean_quota_tree but this is not done. 1072 */ 1073 trans = btrfs_start_transaction(fs_info->tree_root, 1); 1074 if (IS_ERR(trans)) { 1075 ret = PTR_ERR(trans); 1076 goto out; 1077 } 1078 1079 clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags); 1080 btrfs_qgroup_wait_for_completion(fs_info, false); 1081 spin_lock(&fs_info->qgroup_lock); 1082 quota_root = fs_info->quota_root; 1083 fs_info->quota_root = NULL; 1084 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON; 1085 spin_unlock(&fs_info->qgroup_lock); 1086 1087 btrfs_free_qgroup_config(fs_info); 1088 1089 ret = btrfs_clean_quota_tree(trans, quota_root); 1090 if (ret) { 1091 btrfs_abort_transaction(trans, ret); 1092 goto end_trans; 1093 } 1094 1095 ret = btrfs_del_root(trans, "a_root->root_key); 1096 if (ret) { 1097 btrfs_abort_transaction(trans, ret); 1098 goto end_trans; 1099 } 1100 1101 list_del("a_root->dirty_list); 1102 1103 btrfs_tree_lock(quota_root->node); 1104 clean_tree_block(fs_info, quota_root->node); 1105 btrfs_tree_unlock(quota_root->node); 1106 btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1); 1107 1108 free_extent_buffer(quota_root->node); 1109 free_extent_buffer(quota_root->commit_root); 1110 kfree(quota_root); 1111 1112 end_trans: 1113 ret = btrfs_end_transaction(trans); 1114 out: 1115 mutex_unlock(&fs_info->qgroup_ioctl_lock); 1116 return ret; 1117 } 1118 1119 static void qgroup_dirty(struct btrfs_fs_info *fs_info, 1120 struct btrfs_qgroup *qgroup) 1121 { 1122 if (list_empty(&qgroup->dirty)) 1123 list_add(&qgroup->dirty, &fs_info->dirty_qgroups); 1124 } 1125 1126 /* 1127 * The easy accounting, we're updating qgroup relationship whose child qgroup 1128 * only has exclusive extents. 1129 * 1130 * In this case, all exclusive extents will also be exclusive for parent, so 1131 * excl/rfer just get added/removed. 1132 * 1133 * So is qgroup reservation space, which should also be added/removed to 1134 * parent. 1135 * Or when child tries to release reservation space, parent will underflow its 1136 * reservation (for relationship adding case). 1137 * 1138 * Caller should hold fs_info->qgroup_lock. 1139 */ 1140 static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info, 1141 struct ulist *tmp, u64 ref_root, 1142 struct btrfs_qgroup *src, int sign) 1143 { 1144 struct btrfs_qgroup *qgroup; 1145 struct btrfs_qgroup_list *glist; 1146 struct ulist_node *unode; 1147 struct ulist_iterator uiter; 1148 u64 num_bytes = src->excl; 1149 int ret = 0; 1150 1151 qgroup = find_qgroup_rb(fs_info, ref_root); 1152 if (!qgroup) 1153 goto out; 1154 1155 qgroup->rfer += sign * num_bytes; 1156 qgroup->rfer_cmpr += sign * num_bytes; 1157 1158 WARN_ON(sign < 0 && qgroup->excl < num_bytes); 1159 qgroup->excl += sign * num_bytes; 1160 qgroup->excl_cmpr += sign * num_bytes; 1161 1162 if (sign > 0) 1163 qgroup_rsv_add_by_qgroup(fs_info, qgroup, src); 1164 else 1165 qgroup_rsv_release_by_qgroup(fs_info, qgroup, src); 1166 1167 qgroup_dirty(fs_info, qgroup); 1168 1169 /* Get all of the parent groups that contain this qgroup */ 1170 list_for_each_entry(glist, &qgroup->groups, next_group) { 1171 ret = ulist_add(tmp, glist->group->qgroupid, 1172 qgroup_to_aux(glist->group), GFP_ATOMIC); 1173 if (ret < 0) 1174 goto out; 1175 } 1176 1177 /* Iterate all of the parents and adjust their reference counts */ 1178 ULIST_ITER_INIT(&uiter); 1179 while ((unode = ulist_next(tmp, &uiter))) { 1180 qgroup = unode_aux_to_qgroup(unode); 1181 qgroup->rfer += sign * num_bytes; 1182 qgroup->rfer_cmpr += sign * num_bytes; 1183 WARN_ON(sign < 0 && qgroup->excl < num_bytes); 1184 qgroup->excl += sign * num_bytes; 1185 if (sign > 0) 1186 qgroup_rsv_add_by_qgroup(fs_info, qgroup, src); 1187 else 1188 qgroup_rsv_release_by_qgroup(fs_info, qgroup, src); 1189 qgroup->excl_cmpr += sign * num_bytes; 1190 qgroup_dirty(fs_info, qgroup); 1191 1192 /* Add any parents of the parents */ 1193 list_for_each_entry(glist, &qgroup->groups, next_group) { 1194 ret = ulist_add(tmp, glist->group->qgroupid, 1195 qgroup_to_aux(glist->group), GFP_ATOMIC); 1196 if (ret < 0) 1197 goto out; 1198 } 1199 } 1200 ret = 0; 1201 out: 1202 return ret; 1203 } 1204 1205 1206 /* 1207 * Quick path for updating qgroup with only excl refs. 1208 * 1209 * In that case, just update all parent will be enough. 1210 * Or we needs to do a full rescan. 1211 * Caller should also hold fs_info->qgroup_lock. 1212 * 1213 * Return 0 for quick update, return >0 for need to full rescan 1214 * and mark INCONSISTENT flag. 1215 * Return < 0 for other error. 1216 */ 1217 static int quick_update_accounting(struct btrfs_fs_info *fs_info, 1218 struct ulist *tmp, u64 src, u64 dst, 1219 int sign) 1220 { 1221 struct btrfs_qgroup *qgroup; 1222 int ret = 1; 1223 int err = 0; 1224 1225 qgroup = find_qgroup_rb(fs_info, src); 1226 if (!qgroup) 1227 goto out; 1228 if (qgroup->excl == qgroup->rfer) { 1229 ret = 0; 1230 err = __qgroup_excl_accounting(fs_info, tmp, dst, 1231 qgroup, sign); 1232 if (err < 0) { 1233 ret = err; 1234 goto out; 1235 } 1236 } 1237 out: 1238 if (ret) 1239 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 1240 return ret; 1241 } 1242 1243 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, u64 src, 1244 u64 dst) 1245 { 1246 struct btrfs_fs_info *fs_info = trans->fs_info; 1247 struct btrfs_root *quota_root; 1248 struct btrfs_qgroup *parent; 1249 struct btrfs_qgroup *member; 1250 struct btrfs_qgroup_list *list; 1251 struct ulist *tmp; 1252 int ret = 0; 1253 1254 /* Check the level of src and dst first */ 1255 if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst)) 1256 return -EINVAL; 1257 1258 tmp = ulist_alloc(GFP_KERNEL); 1259 if (!tmp) 1260 return -ENOMEM; 1261 1262 mutex_lock(&fs_info->qgroup_ioctl_lock); 1263 quota_root = fs_info->quota_root; 1264 if (!quota_root) { 1265 ret = -EINVAL; 1266 goto out; 1267 } 1268 member = find_qgroup_rb(fs_info, src); 1269 parent = find_qgroup_rb(fs_info, dst); 1270 if (!member || !parent) { 1271 ret = -EINVAL; 1272 goto out; 1273 } 1274 1275 /* check if such qgroup relation exist firstly */ 1276 list_for_each_entry(list, &member->groups, next_group) { 1277 if (list->group == parent) { 1278 ret = -EEXIST; 1279 goto out; 1280 } 1281 } 1282 1283 ret = add_qgroup_relation_item(trans, src, dst); 1284 if (ret) 1285 goto out; 1286 1287 ret = add_qgroup_relation_item(trans, dst, src); 1288 if (ret) { 1289 del_qgroup_relation_item(trans, src, dst); 1290 goto out; 1291 } 1292 1293 spin_lock(&fs_info->qgroup_lock); 1294 ret = add_relation_rb(fs_info, src, dst); 1295 if (ret < 0) { 1296 spin_unlock(&fs_info->qgroup_lock); 1297 goto out; 1298 } 1299 ret = quick_update_accounting(fs_info, tmp, src, dst, 1); 1300 spin_unlock(&fs_info->qgroup_lock); 1301 out: 1302 mutex_unlock(&fs_info->qgroup_ioctl_lock); 1303 ulist_free(tmp); 1304 return ret; 1305 } 1306 1307 static int __del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src, 1308 u64 dst) 1309 { 1310 struct btrfs_fs_info *fs_info = trans->fs_info; 1311 struct btrfs_root *quota_root; 1312 struct btrfs_qgroup *parent; 1313 struct btrfs_qgroup *member; 1314 struct btrfs_qgroup_list *list; 1315 struct ulist *tmp; 1316 int ret = 0; 1317 int err; 1318 1319 tmp = ulist_alloc(GFP_KERNEL); 1320 if (!tmp) 1321 return -ENOMEM; 1322 1323 quota_root = fs_info->quota_root; 1324 if (!quota_root) { 1325 ret = -EINVAL; 1326 goto out; 1327 } 1328 1329 member = find_qgroup_rb(fs_info, src); 1330 parent = find_qgroup_rb(fs_info, dst); 1331 if (!member || !parent) { 1332 ret = -EINVAL; 1333 goto out; 1334 } 1335 1336 /* check if such qgroup relation exist firstly */ 1337 list_for_each_entry(list, &member->groups, next_group) { 1338 if (list->group == parent) 1339 goto exist; 1340 } 1341 ret = -ENOENT; 1342 goto out; 1343 exist: 1344 ret = del_qgroup_relation_item(trans, src, dst); 1345 err = del_qgroup_relation_item(trans, dst, src); 1346 if (err && !ret) 1347 ret = err; 1348 1349 spin_lock(&fs_info->qgroup_lock); 1350 del_relation_rb(fs_info, src, dst); 1351 ret = quick_update_accounting(fs_info, tmp, src, dst, -1); 1352 spin_unlock(&fs_info->qgroup_lock); 1353 out: 1354 ulist_free(tmp); 1355 return ret; 1356 } 1357 1358 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src, 1359 u64 dst) 1360 { 1361 struct btrfs_fs_info *fs_info = trans->fs_info; 1362 int ret = 0; 1363 1364 mutex_lock(&fs_info->qgroup_ioctl_lock); 1365 ret = __del_qgroup_relation(trans, src, dst); 1366 mutex_unlock(&fs_info->qgroup_ioctl_lock); 1367 1368 return ret; 1369 } 1370 1371 int btrfs_create_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid) 1372 { 1373 struct btrfs_fs_info *fs_info = trans->fs_info; 1374 struct btrfs_root *quota_root; 1375 struct btrfs_qgroup *qgroup; 1376 int ret = 0; 1377 1378 mutex_lock(&fs_info->qgroup_ioctl_lock); 1379 quota_root = fs_info->quota_root; 1380 if (!quota_root) { 1381 ret = -EINVAL; 1382 goto out; 1383 } 1384 qgroup = find_qgroup_rb(fs_info, qgroupid); 1385 if (qgroup) { 1386 ret = -EEXIST; 1387 goto out; 1388 } 1389 1390 ret = add_qgroup_item(trans, quota_root, qgroupid); 1391 if (ret) 1392 goto out; 1393 1394 spin_lock(&fs_info->qgroup_lock); 1395 qgroup = add_qgroup_rb(fs_info, qgroupid); 1396 spin_unlock(&fs_info->qgroup_lock); 1397 1398 if (IS_ERR(qgroup)) 1399 ret = PTR_ERR(qgroup); 1400 out: 1401 mutex_unlock(&fs_info->qgroup_ioctl_lock); 1402 return ret; 1403 } 1404 1405 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid) 1406 { 1407 struct btrfs_fs_info *fs_info = trans->fs_info; 1408 struct btrfs_root *quota_root; 1409 struct btrfs_qgroup *qgroup; 1410 struct btrfs_qgroup_list *list; 1411 int ret = 0; 1412 1413 mutex_lock(&fs_info->qgroup_ioctl_lock); 1414 quota_root = fs_info->quota_root; 1415 if (!quota_root) { 1416 ret = -EINVAL; 1417 goto out; 1418 } 1419 1420 qgroup = find_qgroup_rb(fs_info, qgroupid); 1421 if (!qgroup) { 1422 ret = -ENOENT; 1423 goto out; 1424 } 1425 1426 /* Check if there are no children of this qgroup */ 1427 if (!list_empty(&qgroup->members)) { 1428 ret = -EBUSY; 1429 goto out; 1430 } 1431 1432 ret = del_qgroup_item(trans, qgroupid); 1433 if (ret && ret != -ENOENT) 1434 goto out; 1435 1436 while (!list_empty(&qgroup->groups)) { 1437 list = list_first_entry(&qgroup->groups, 1438 struct btrfs_qgroup_list, next_group); 1439 ret = __del_qgroup_relation(trans, qgroupid, 1440 list->group->qgroupid); 1441 if (ret) 1442 goto out; 1443 } 1444 1445 spin_lock(&fs_info->qgroup_lock); 1446 del_qgroup_rb(fs_info, qgroupid); 1447 spin_unlock(&fs_info->qgroup_lock); 1448 out: 1449 mutex_unlock(&fs_info->qgroup_ioctl_lock); 1450 return ret; 1451 } 1452 1453 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid, 1454 struct btrfs_qgroup_limit *limit) 1455 { 1456 struct btrfs_fs_info *fs_info = trans->fs_info; 1457 struct btrfs_root *quota_root; 1458 struct btrfs_qgroup *qgroup; 1459 int ret = 0; 1460 /* Sometimes we would want to clear the limit on this qgroup. 1461 * To meet this requirement, we treat the -1 as a special value 1462 * which tell kernel to clear the limit on this qgroup. 1463 */ 1464 const u64 CLEAR_VALUE = -1; 1465 1466 mutex_lock(&fs_info->qgroup_ioctl_lock); 1467 quota_root = fs_info->quota_root; 1468 if (!quota_root) { 1469 ret = -EINVAL; 1470 goto out; 1471 } 1472 1473 qgroup = find_qgroup_rb(fs_info, qgroupid); 1474 if (!qgroup) { 1475 ret = -ENOENT; 1476 goto out; 1477 } 1478 1479 spin_lock(&fs_info->qgroup_lock); 1480 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) { 1481 if (limit->max_rfer == CLEAR_VALUE) { 1482 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER; 1483 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER; 1484 qgroup->max_rfer = 0; 1485 } else { 1486 qgroup->max_rfer = limit->max_rfer; 1487 } 1488 } 1489 if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) { 1490 if (limit->max_excl == CLEAR_VALUE) { 1491 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL; 1492 limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL; 1493 qgroup->max_excl = 0; 1494 } else { 1495 qgroup->max_excl = limit->max_excl; 1496 } 1497 } 1498 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) { 1499 if (limit->rsv_rfer == CLEAR_VALUE) { 1500 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER; 1501 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER; 1502 qgroup->rsv_rfer = 0; 1503 } else { 1504 qgroup->rsv_rfer = limit->rsv_rfer; 1505 } 1506 } 1507 if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) { 1508 if (limit->rsv_excl == CLEAR_VALUE) { 1509 qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL; 1510 limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL; 1511 qgroup->rsv_excl = 0; 1512 } else { 1513 qgroup->rsv_excl = limit->rsv_excl; 1514 } 1515 } 1516 qgroup->lim_flags |= limit->flags; 1517 1518 spin_unlock(&fs_info->qgroup_lock); 1519 1520 ret = update_qgroup_limit_item(trans, qgroup); 1521 if (ret) { 1522 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 1523 btrfs_info(fs_info, "unable to update quota limit for %llu", 1524 qgroupid); 1525 } 1526 1527 out: 1528 mutex_unlock(&fs_info->qgroup_ioctl_lock); 1529 return ret; 1530 } 1531 1532 int btrfs_qgroup_trace_extent_nolock(struct btrfs_fs_info *fs_info, 1533 struct btrfs_delayed_ref_root *delayed_refs, 1534 struct btrfs_qgroup_extent_record *record) 1535 { 1536 struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node; 1537 struct rb_node *parent_node = NULL; 1538 struct btrfs_qgroup_extent_record *entry; 1539 u64 bytenr = record->bytenr; 1540 1541 lockdep_assert_held(&delayed_refs->lock); 1542 trace_btrfs_qgroup_trace_extent(fs_info, record); 1543 1544 while (*p) { 1545 parent_node = *p; 1546 entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record, 1547 node); 1548 if (bytenr < entry->bytenr) { 1549 p = &(*p)->rb_left; 1550 } else if (bytenr > entry->bytenr) { 1551 p = &(*p)->rb_right; 1552 } else { 1553 if (record->data_rsv && !entry->data_rsv) { 1554 entry->data_rsv = record->data_rsv; 1555 entry->data_rsv_refroot = 1556 record->data_rsv_refroot; 1557 } 1558 return 1; 1559 } 1560 } 1561 1562 rb_link_node(&record->node, parent_node, p); 1563 rb_insert_color(&record->node, &delayed_refs->dirty_extent_root); 1564 return 0; 1565 } 1566 1567 int btrfs_qgroup_trace_extent_post(struct btrfs_fs_info *fs_info, 1568 struct btrfs_qgroup_extent_record *qrecord) 1569 { 1570 struct ulist *old_root; 1571 u64 bytenr = qrecord->bytenr; 1572 int ret; 1573 1574 ret = btrfs_find_all_roots(NULL, fs_info, bytenr, 0, &old_root, false); 1575 if (ret < 0) { 1576 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 1577 btrfs_warn(fs_info, 1578 "error accounting new delayed refs extent (err code: %d), quota inconsistent", 1579 ret); 1580 return 0; 1581 } 1582 1583 /* 1584 * Here we don't need to get the lock of 1585 * trans->transaction->delayed_refs, since inserted qrecord won't 1586 * be deleted, only qrecord->node may be modified (new qrecord insert) 1587 * 1588 * So modifying qrecord->old_roots is safe here 1589 */ 1590 qrecord->old_roots = old_root; 1591 return 0; 1592 } 1593 1594 int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans, u64 bytenr, 1595 u64 num_bytes, gfp_t gfp_flag) 1596 { 1597 struct btrfs_fs_info *fs_info = trans->fs_info; 1598 struct btrfs_qgroup_extent_record *record; 1599 struct btrfs_delayed_ref_root *delayed_refs; 1600 int ret; 1601 1602 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) 1603 || bytenr == 0 || num_bytes == 0) 1604 return 0; 1605 record = kzalloc(sizeof(*record), gfp_flag); 1606 if (!record) 1607 return -ENOMEM; 1608 1609 delayed_refs = &trans->transaction->delayed_refs; 1610 record->bytenr = bytenr; 1611 record->num_bytes = num_bytes; 1612 record->old_roots = NULL; 1613 1614 spin_lock(&delayed_refs->lock); 1615 ret = btrfs_qgroup_trace_extent_nolock(fs_info, delayed_refs, record); 1616 spin_unlock(&delayed_refs->lock); 1617 if (ret > 0) { 1618 kfree(record); 1619 return 0; 1620 } 1621 return btrfs_qgroup_trace_extent_post(fs_info, record); 1622 } 1623 1624 int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans, 1625 struct extent_buffer *eb) 1626 { 1627 struct btrfs_fs_info *fs_info = trans->fs_info; 1628 int nr = btrfs_header_nritems(eb); 1629 int i, extent_type, ret; 1630 struct btrfs_key key; 1631 struct btrfs_file_extent_item *fi; 1632 u64 bytenr, num_bytes; 1633 1634 /* We can be called directly from walk_up_proc() */ 1635 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 1636 return 0; 1637 1638 for (i = 0; i < nr; i++) { 1639 btrfs_item_key_to_cpu(eb, &key, i); 1640 1641 if (key.type != BTRFS_EXTENT_DATA_KEY) 1642 continue; 1643 1644 fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item); 1645 /* filter out non qgroup-accountable extents */ 1646 extent_type = btrfs_file_extent_type(eb, fi); 1647 1648 if (extent_type == BTRFS_FILE_EXTENT_INLINE) 1649 continue; 1650 1651 bytenr = btrfs_file_extent_disk_bytenr(eb, fi); 1652 if (!bytenr) 1653 continue; 1654 1655 num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi); 1656 1657 ret = btrfs_qgroup_trace_extent(trans, bytenr, num_bytes, 1658 GFP_NOFS); 1659 if (ret) 1660 return ret; 1661 } 1662 cond_resched(); 1663 return 0; 1664 } 1665 1666 /* 1667 * Walk up the tree from the bottom, freeing leaves and any interior 1668 * nodes which have had all slots visited. If a node (leaf or 1669 * interior) is freed, the node above it will have it's slot 1670 * incremented. The root node will never be freed. 1671 * 1672 * At the end of this function, we should have a path which has all 1673 * slots incremented to the next position for a search. If we need to 1674 * read a new node it will be NULL and the node above it will have the 1675 * correct slot selected for a later read. 1676 * 1677 * If we increment the root nodes slot counter past the number of 1678 * elements, 1 is returned to signal completion of the search. 1679 */ 1680 static int adjust_slots_upwards(struct btrfs_path *path, int root_level) 1681 { 1682 int level = 0; 1683 int nr, slot; 1684 struct extent_buffer *eb; 1685 1686 if (root_level == 0) 1687 return 1; 1688 1689 while (level <= root_level) { 1690 eb = path->nodes[level]; 1691 nr = btrfs_header_nritems(eb); 1692 path->slots[level]++; 1693 slot = path->slots[level]; 1694 if (slot >= nr || level == 0) { 1695 /* 1696 * Don't free the root - we will detect this 1697 * condition after our loop and return a 1698 * positive value for caller to stop walking the tree. 1699 */ 1700 if (level != root_level) { 1701 btrfs_tree_unlock_rw(eb, path->locks[level]); 1702 path->locks[level] = 0; 1703 1704 free_extent_buffer(eb); 1705 path->nodes[level] = NULL; 1706 path->slots[level] = 0; 1707 } 1708 } else { 1709 /* 1710 * We have a valid slot to walk back down 1711 * from. Stop here so caller can process these 1712 * new nodes. 1713 */ 1714 break; 1715 } 1716 1717 level++; 1718 } 1719 1720 eb = path->nodes[root_level]; 1721 if (path->slots[root_level] >= btrfs_header_nritems(eb)) 1722 return 1; 1723 1724 return 0; 1725 } 1726 1727 /* 1728 * Helper function to trace a subtree tree block swap. 1729 * 1730 * The swap will happen in highest tree block, but there may be a lot of 1731 * tree blocks involved. 1732 * 1733 * For example: 1734 * OO = Old tree blocks 1735 * NN = New tree blocks allocated during balance 1736 * 1737 * File tree (257) Reloc tree for 257 1738 * L2 OO NN 1739 * / \ / \ 1740 * L1 OO OO (a) OO NN (a) 1741 * / \ / \ / \ / \ 1742 * L0 OO OO OO OO OO OO NN NN 1743 * (b) (c) (b) (c) 1744 * 1745 * When calling qgroup_trace_extent_swap(), we will pass: 1746 * @src_eb = OO(a) 1747 * @dst_path = [ nodes[1] = NN(a), nodes[0] = NN(c) ] 1748 * @dst_level = 0 1749 * @root_level = 1 1750 * 1751 * In that case, qgroup_trace_extent_swap() will search from OO(a) to 1752 * reach OO(c), then mark both OO(c) and NN(c) as qgroup dirty. 1753 * 1754 * The main work of qgroup_trace_extent_swap() can be split into 3 parts: 1755 * 1756 * 1) Tree search from @src_eb 1757 * It should acts as a simplified btrfs_search_slot(). 1758 * The key for search can be extracted from @dst_path->nodes[dst_level] 1759 * (first key). 1760 * 1761 * 2) Mark the final tree blocks in @src_path and @dst_path qgroup dirty 1762 * NOTE: In above case, OO(a) and NN(a) won't be marked qgroup dirty. 1763 * They should be marked during previous (@dst_level = 1) iteration. 1764 * 1765 * 3) Mark file extents in leaves dirty 1766 * We don't have good way to pick out new file extents only. 1767 * So we still follow the old method by scanning all file extents in 1768 * the leave. 1769 * 1770 * This function can free us from keeping two paths, thus later we only need 1771 * to care about how to iterate all new tree blocks in reloc tree. 1772 */ 1773 static int qgroup_trace_extent_swap(struct btrfs_trans_handle* trans, 1774 struct extent_buffer *src_eb, 1775 struct btrfs_path *dst_path, 1776 int dst_level, int root_level, 1777 bool trace_leaf) 1778 { 1779 struct btrfs_key key; 1780 struct btrfs_path *src_path; 1781 struct btrfs_fs_info *fs_info = trans->fs_info; 1782 u32 nodesize = fs_info->nodesize; 1783 int cur_level = root_level; 1784 int ret; 1785 1786 BUG_ON(dst_level > root_level); 1787 /* Level mismatch */ 1788 if (btrfs_header_level(src_eb) != root_level) 1789 return -EINVAL; 1790 1791 src_path = btrfs_alloc_path(); 1792 if (!src_path) { 1793 ret = -ENOMEM; 1794 goto out; 1795 } 1796 1797 if (dst_level) 1798 btrfs_node_key_to_cpu(dst_path->nodes[dst_level], &key, 0); 1799 else 1800 btrfs_item_key_to_cpu(dst_path->nodes[dst_level], &key, 0); 1801 1802 /* For src_path */ 1803 extent_buffer_get(src_eb); 1804 src_path->nodes[root_level] = src_eb; 1805 src_path->slots[root_level] = dst_path->slots[root_level]; 1806 src_path->locks[root_level] = 0; 1807 1808 /* A simplified version of btrfs_search_slot() */ 1809 while (cur_level >= dst_level) { 1810 struct btrfs_key src_key; 1811 struct btrfs_key dst_key; 1812 1813 if (src_path->nodes[cur_level] == NULL) { 1814 struct btrfs_key first_key; 1815 struct extent_buffer *eb; 1816 int parent_slot; 1817 u64 child_gen; 1818 u64 child_bytenr; 1819 1820 eb = src_path->nodes[cur_level + 1]; 1821 parent_slot = src_path->slots[cur_level + 1]; 1822 child_bytenr = btrfs_node_blockptr(eb, parent_slot); 1823 child_gen = btrfs_node_ptr_generation(eb, parent_slot); 1824 btrfs_node_key_to_cpu(eb, &first_key, parent_slot); 1825 1826 eb = read_tree_block(fs_info, child_bytenr, child_gen, 1827 cur_level, &first_key); 1828 if (IS_ERR(eb)) { 1829 ret = PTR_ERR(eb); 1830 goto out; 1831 } else if (!extent_buffer_uptodate(eb)) { 1832 free_extent_buffer(eb); 1833 ret = -EIO; 1834 goto out; 1835 } 1836 1837 src_path->nodes[cur_level] = eb; 1838 1839 btrfs_tree_read_lock(eb); 1840 btrfs_set_lock_blocking_read(eb); 1841 src_path->locks[cur_level] = BTRFS_READ_LOCK_BLOCKING; 1842 } 1843 1844 src_path->slots[cur_level] = dst_path->slots[cur_level]; 1845 if (cur_level) { 1846 btrfs_node_key_to_cpu(dst_path->nodes[cur_level], 1847 &dst_key, dst_path->slots[cur_level]); 1848 btrfs_node_key_to_cpu(src_path->nodes[cur_level], 1849 &src_key, src_path->slots[cur_level]); 1850 } else { 1851 btrfs_item_key_to_cpu(dst_path->nodes[cur_level], 1852 &dst_key, dst_path->slots[cur_level]); 1853 btrfs_item_key_to_cpu(src_path->nodes[cur_level], 1854 &src_key, src_path->slots[cur_level]); 1855 } 1856 /* Content mismatch, something went wrong */ 1857 if (btrfs_comp_cpu_keys(&dst_key, &src_key)) { 1858 ret = -ENOENT; 1859 goto out; 1860 } 1861 cur_level--; 1862 } 1863 1864 /* 1865 * Now both @dst_path and @src_path have been populated, record the tree 1866 * blocks for qgroup accounting. 1867 */ 1868 ret = btrfs_qgroup_trace_extent(trans, src_path->nodes[dst_level]->start, 1869 nodesize, GFP_NOFS); 1870 if (ret < 0) 1871 goto out; 1872 ret = btrfs_qgroup_trace_extent(trans, 1873 dst_path->nodes[dst_level]->start, 1874 nodesize, GFP_NOFS); 1875 if (ret < 0) 1876 goto out; 1877 1878 /* Record leaf file extents */ 1879 if (dst_level == 0 && trace_leaf) { 1880 ret = btrfs_qgroup_trace_leaf_items(trans, src_path->nodes[0]); 1881 if (ret < 0) 1882 goto out; 1883 ret = btrfs_qgroup_trace_leaf_items(trans, dst_path->nodes[0]); 1884 } 1885 out: 1886 btrfs_free_path(src_path); 1887 return ret; 1888 } 1889 1890 /* 1891 * Helper function to do recursive generation-aware depth-first search, to 1892 * locate all new tree blocks in a subtree of reloc tree. 1893 * 1894 * E.g. (OO = Old tree blocks, NN = New tree blocks, whose gen == last_snapshot) 1895 * reloc tree 1896 * L2 NN (a) 1897 * / \ 1898 * L1 OO NN (b) 1899 * / \ / \ 1900 * L0 OO OO OO NN 1901 * (c) (d) 1902 * If we pass: 1903 * @dst_path = [ nodes[1] = NN(b), nodes[0] = NULL ], 1904 * @cur_level = 1 1905 * @root_level = 1 1906 * 1907 * We will iterate through tree blocks NN(b), NN(d) and info qgroup to trace 1908 * above tree blocks along with their counter parts in file tree. 1909 * While during search, old tree blocks OO(c) will be skipped as tree block swap 1910 * won't affect OO(c). 1911 */ 1912 static int qgroup_trace_new_subtree_blocks(struct btrfs_trans_handle* trans, 1913 struct extent_buffer *src_eb, 1914 struct btrfs_path *dst_path, 1915 int cur_level, int root_level, 1916 u64 last_snapshot, bool trace_leaf) 1917 { 1918 struct btrfs_fs_info *fs_info = trans->fs_info; 1919 struct extent_buffer *eb; 1920 bool need_cleanup = false; 1921 int ret = 0; 1922 int i; 1923 1924 /* Level sanity check */ 1925 if (cur_level < 0 || cur_level >= BTRFS_MAX_LEVEL || 1926 root_level < 0 || root_level >= BTRFS_MAX_LEVEL || 1927 root_level < cur_level) { 1928 btrfs_err_rl(fs_info, 1929 "%s: bad levels, cur_level=%d root_level=%d", 1930 __func__, cur_level, root_level); 1931 return -EUCLEAN; 1932 } 1933 1934 /* Read the tree block if needed */ 1935 if (dst_path->nodes[cur_level] == NULL) { 1936 struct btrfs_key first_key; 1937 int parent_slot; 1938 u64 child_gen; 1939 u64 child_bytenr; 1940 1941 /* 1942 * dst_path->nodes[root_level] must be initialized before 1943 * calling this function. 1944 */ 1945 if (cur_level == root_level) { 1946 btrfs_err_rl(fs_info, 1947 "%s: dst_path->nodes[%d] not initialized, root_level=%d cur_level=%d", 1948 __func__, root_level, root_level, cur_level); 1949 return -EUCLEAN; 1950 } 1951 1952 /* 1953 * We need to get child blockptr/gen from parent before we can 1954 * read it. 1955 */ 1956 eb = dst_path->nodes[cur_level + 1]; 1957 parent_slot = dst_path->slots[cur_level + 1]; 1958 child_bytenr = btrfs_node_blockptr(eb, parent_slot); 1959 child_gen = btrfs_node_ptr_generation(eb, parent_slot); 1960 btrfs_node_key_to_cpu(eb, &first_key, parent_slot); 1961 1962 /* This node is old, no need to trace */ 1963 if (child_gen < last_snapshot) 1964 goto out; 1965 1966 eb = read_tree_block(fs_info, child_bytenr, child_gen, 1967 cur_level, &first_key); 1968 if (IS_ERR(eb)) { 1969 ret = PTR_ERR(eb); 1970 goto out; 1971 } else if (!extent_buffer_uptodate(eb)) { 1972 free_extent_buffer(eb); 1973 ret = -EIO; 1974 goto out; 1975 } 1976 1977 dst_path->nodes[cur_level] = eb; 1978 dst_path->slots[cur_level] = 0; 1979 1980 btrfs_tree_read_lock(eb); 1981 btrfs_set_lock_blocking_read(eb); 1982 dst_path->locks[cur_level] = BTRFS_READ_LOCK_BLOCKING; 1983 need_cleanup = true; 1984 } 1985 1986 /* Now record this tree block and its counter part for qgroups */ 1987 ret = qgroup_trace_extent_swap(trans, src_eb, dst_path, cur_level, 1988 root_level, trace_leaf); 1989 if (ret < 0) 1990 goto cleanup; 1991 1992 eb = dst_path->nodes[cur_level]; 1993 1994 if (cur_level > 0) { 1995 /* Iterate all child tree blocks */ 1996 for (i = 0; i < btrfs_header_nritems(eb); i++) { 1997 /* Skip old tree blocks as they won't be swapped */ 1998 if (btrfs_node_ptr_generation(eb, i) < last_snapshot) 1999 continue; 2000 dst_path->slots[cur_level] = i; 2001 2002 /* Recursive call (at most 7 times) */ 2003 ret = qgroup_trace_new_subtree_blocks(trans, src_eb, 2004 dst_path, cur_level - 1, root_level, 2005 last_snapshot, trace_leaf); 2006 if (ret < 0) 2007 goto cleanup; 2008 } 2009 } 2010 2011 cleanup: 2012 if (need_cleanup) { 2013 /* Clean up */ 2014 btrfs_tree_unlock_rw(dst_path->nodes[cur_level], 2015 dst_path->locks[cur_level]); 2016 free_extent_buffer(dst_path->nodes[cur_level]); 2017 dst_path->nodes[cur_level] = NULL; 2018 dst_path->slots[cur_level] = 0; 2019 dst_path->locks[cur_level] = 0; 2020 } 2021 out: 2022 return ret; 2023 } 2024 2025 static int qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans, 2026 struct extent_buffer *src_eb, 2027 struct extent_buffer *dst_eb, 2028 u64 last_snapshot, bool trace_leaf) 2029 { 2030 struct btrfs_fs_info *fs_info = trans->fs_info; 2031 struct btrfs_path *dst_path = NULL; 2032 int level; 2033 int ret; 2034 2035 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 2036 return 0; 2037 2038 /* Wrong parameter order */ 2039 if (btrfs_header_generation(src_eb) > btrfs_header_generation(dst_eb)) { 2040 btrfs_err_rl(fs_info, 2041 "%s: bad parameter order, src_gen=%llu dst_gen=%llu", __func__, 2042 btrfs_header_generation(src_eb), 2043 btrfs_header_generation(dst_eb)); 2044 return -EUCLEAN; 2045 } 2046 2047 if (!extent_buffer_uptodate(src_eb) || !extent_buffer_uptodate(dst_eb)) { 2048 ret = -EIO; 2049 goto out; 2050 } 2051 2052 level = btrfs_header_level(dst_eb); 2053 dst_path = btrfs_alloc_path(); 2054 if (!dst_path) { 2055 ret = -ENOMEM; 2056 goto out; 2057 } 2058 /* For dst_path */ 2059 extent_buffer_get(dst_eb); 2060 dst_path->nodes[level] = dst_eb; 2061 dst_path->slots[level] = 0; 2062 dst_path->locks[level] = 0; 2063 2064 /* Do the generation aware breadth-first search */ 2065 ret = qgroup_trace_new_subtree_blocks(trans, src_eb, dst_path, level, 2066 level, last_snapshot, trace_leaf); 2067 if (ret < 0) 2068 goto out; 2069 ret = 0; 2070 2071 out: 2072 btrfs_free_path(dst_path); 2073 if (ret < 0) 2074 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 2075 return ret; 2076 } 2077 2078 int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans, 2079 struct extent_buffer *root_eb, 2080 u64 root_gen, int root_level) 2081 { 2082 struct btrfs_fs_info *fs_info = trans->fs_info; 2083 int ret = 0; 2084 int level; 2085 struct extent_buffer *eb = root_eb; 2086 struct btrfs_path *path = NULL; 2087 2088 BUG_ON(root_level < 0 || root_level >= BTRFS_MAX_LEVEL); 2089 BUG_ON(root_eb == NULL); 2090 2091 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 2092 return 0; 2093 2094 if (!extent_buffer_uptodate(root_eb)) { 2095 ret = btrfs_read_buffer(root_eb, root_gen, root_level, NULL); 2096 if (ret) 2097 goto out; 2098 } 2099 2100 if (root_level == 0) { 2101 ret = btrfs_qgroup_trace_leaf_items(trans, root_eb); 2102 goto out; 2103 } 2104 2105 path = btrfs_alloc_path(); 2106 if (!path) 2107 return -ENOMEM; 2108 2109 /* 2110 * Walk down the tree. Missing extent blocks are filled in as 2111 * we go. Metadata is accounted every time we read a new 2112 * extent block. 2113 * 2114 * When we reach a leaf, we account for file extent items in it, 2115 * walk back up the tree (adjusting slot pointers as we go) 2116 * and restart the search process. 2117 */ 2118 extent_buffer_get(root_eb); /* For path */ 2119 path->nodes[root_level] = root_eb; 2120 path->slots[root_level] = 0; 2121 path->locks[root_level] = 0; /* so release_path doesn't try to unlock */ 2122 walk_down: 2123 level = root_level; 2124 while (level >= 0) { 2125 if (path->nodes[level] == NULL) { 2126 struct btrfs_key first_key; 2127 int parent_slot; 2128 u64 child_gen; 2129 u64 child_bytenr; 2130 2131 /* 2132 * We need to get child blockptr/gen from parent before 2133 * we can read it. 2134 */ 2135 eb = path->nodes[level + 1]; 2136 parent_slot = path->slots[level + 1]; 2137 child_bytenr = btrfs_node_blockptr(eb, parent_slot); 2138 child_gen = btrfs_node_ptr_generation(eb, parent_slot); 2139 btrfs_node_key_to_cpu(eb, &first_key, parent_slot); 2140 2141 eb = read_tree_block(fs_info, child_bytenr, child_gen, 2142 level, &first_key); 2143 if (IS_ERR(eb)) { 2144 ret = PTR_ERR(eb); 2145 goto out; 2146 } else if (!extent_buffer_uptodate(eb)) { 2147 free_extent_buffer(eb); 2148 ret = -EIO; 2149 goto out; 2150 } 2151 2152 path->nodes[level] = eb; 2153 path->slots[level] = 0; 2154 2155 btrfs_tree_read_lock(eb); 2156 btrfs_set_lock_blocking_read(eb); 2157 path->locks[level] = BTRFS_READ_LOCK_BLOCKING; 2158 2159 ret = btrfs_qgroup_trace_extent(trans, child_bytenr, 2160 fs_info->nodesize, 2161 GFP_NOFS); 2162 if (ret) 2163 goto out; 2164 } 2165 2166 if (level == 0) { 2167 ret = btrfs_qgroup_trace_leaf_items(trans, 2168 path->nodes[level]); 2169 if (ret) 2170 goto out; 2171 2172 /* Nonzero return here means we completed our search */ 2173 ret = adjust_slots_upwards(path, root_level); 2174 if (ret) 2175 break; 2176 2177 /* Restart search with new slots */ 2178 goto walk_down; 2179 } 2180 2181 level--; 2182 } 2183 2184 ret = 0; 2185 out: 2186 btrfs_free_path(path); 2187 2188 return ret; 2189 } 2190 2191 #define UPDATE_NEW 0 2192 #define UPDATE_OLD 1 2193 /* 2194 * Walk all of the roots that points to the bytenr and adjust their refcnts. 2195 */ 2196 static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info, 2197 struct ulist *roots, struct ulist *tmp, 2198 struct ulist *qgroups, u64 seq, int update_old) 2199 { 2200 struct ulist_node *unode; 2201 struct ulist_iterator uiter; 2202 struct ulist_node *tmp_unode; 2203 struct ulist_iterator tmp_uiter; 2204 struct btrfs_qgroup *qg; 2205 int ret = 0; 2206 2207 if (!roots) 2208 return 0; 2209 ULIST_ITER_INIT(&uiter); 2210 while ((unode = ulist_next(roots, &uiter))) { 2211 qg = find_qgroup_rb(fs_info, unode->val); 2212 if (!qg) 2213 continue; 2214 2215 ulist_reinit(tmp); 2216 ret = ulist_add(qgroups, qg->qgroupid, qgroup_to_aux(qg), 2217 GFP_ATOMIC); 2218 if (ret < 0) 2219 return ret; 2220 ret = ulist_add(tmp, qg->qgroupid, qgroup_to_aux(qg), GFP_ATOMIC); 2221 if (ret < 0) 2222 return ret; 2223 ULIST_ITER_INIT(&tmp_uiter); 2224 while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) { 2225 struct btrfs_qgroup_list *glist; 2226 2227 qg = unode_aux_to_qgroup(tmp_unode); 2228 if (update_old) 2229 btrfs_qgroup_update_old_refcnt(qg, seq, 1); 2230 else 2231 btrfs_qgroup_update_new_refcnt(qg, seq, 1); 2232 list_for_each_entry(glist, &qg->groups, next_group) { 2233 ret = ulist_add(qgroups, glist->group->qgroupid, 2234 qgroup_to_aux(glist->group), 2235 GFP_ATOMIC); 2236 if (ret < 0) 2237 return ret; 2238 ret = ulist_add(tmp, glist->group->qgroupid, 2239 qgroup_to_aux(glist->group), 2240 GFP_ATOMIC); 2241 if (ret < 0) 2242 return ret; 2243 } 2244 } 2245 } 2246 return 0; 2247 } 2248 2249 /* 2250 * Update qgroup rfer/excl counters. 2251 * Rfer update is easy, codes can explain themselves. 2252 * 2253 * Excl update is tricky, the update is split into 2 part. 2254 * Part 1: Possible exclusive <-> sharing detect: 2255 * | A | !A | 2256 * ------------------------------------- 2257 * B | * | - | 2258 * ------------------------------------- 2259 * !B | + | ** | 2260 * ------------------------------------- 2261 * 2262 * Conditions: 2263 * A: cur_old_roots < nr_old_roots (not exclusive before) 2264 * !A: cur_old_roots == nr_old_roots (possible exclusive before) 2265 * B: cur_new_roots < nr_new_roots (not exclusive now) 2266 * !B: cur_new_roots == nr_new_roots (possible exclusive now) 2267 * 2268 * Results: 2269 * +: Possible sharing -> exclusive -: Possible exclusive -> sharing 2270 * *: Definitely not changed. **: Possible unchanged. 2271 * 2272 * For !A and !B condition, the exception is cur_old/new_roots == 0 case. 2273 * 2274 * To make the logic clear, we first use condition A and B to split 2275 * combination into 4 results. 2276 * 2277 * Then, for result "+" and "-", check old/new_roots == 0 case, as in them 2278 * only on variant maybe 0. 2279 * 2280 * Lastly, check result **, since there are 2 variants maybe 0, split them 2281 * again(2x2). 2282 * But this time we don't need to consider other things, the codes and logic 2283 * is easy to understand now. 2284 */ 2285 static int qgroup_update_counters(struct btrfs_fs_info *fs_info, 2286 struct ulist *qgroups, 2287 u64 nr_old_roots, 2288 u64 nr_new_roots, 2289 u64 num_bytes, u64 seq) 2290 { 2291 struct ulist_node *unode; 2292 struct ulist_iterator uiter; 2293 struct btrfs_qgroup *qg; 2294 u64 cur_new_count, cur_old_count; 2295 2296 ULIST_ITER_INIT(&uiter); 2297 while ((unode = ulist_next(qgroups, &uiter))) { 2298 bool dirty = false; 2299 2300 qg = unode_aux_to_qgroup(unode); 2301 cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq); 2302 cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq); 2303 2304 trace_qgroup_update_counters(fs_info, qg, cur_old_count, 2305 cur_new_count); 2306 2307 /* Rfer update part */ 2308 if (cur_old_count == 0 && cur_new_count > 0) { 2309 qg->rfer += num_bytes; 2310 qg->rfer_cmpr += num_bytes; 2311 dirty = true; 2312 } 2313 if (cur_old_count > 0 && cur_new_count == 0) { 2314 qg->rfer -= num_bytes; 2315 qg->rfer_cmpr -= num_bytes; 2316 dirty = true; 2317 } 2318 2319 /* Excl update part */ 2320 /* Exclusive/none -> shared case */ 2321 if (cur_old_count == nr_old_roots && 2322 cur_new_count < nr_new_roots) { 2323 /* Exclusive -> shared */ 2324 if (cur_old_count != 0) { 2325 qg->excl -= num_bytes; 2326 qg->excl_cmpr -= num_bytes; 2327 dirty = true; 2328 } 2329 } 2330 2331 /* Shared -> exclusive/none case */ 2332 if (cur_old_count < nr_old_roots && 2333 cur_new_count == nr_new_roots) { 2334 /* Shared->exclusive */ 2335 if (cur_new_count != 0) { 2336 qg->excl += num_bytes; 2337 qg->excl_cmpr += num_bytes; 2338 dirty = true; 2339 } 2340 } 2341 2342 /* Exclusive/none -> exclusive/none case */ 2343 if (cur_old_count == nr_old_roots && 2344 cur_new_count == nr_new_roots) { 2345 if (cur_old_count == 0) { 2346 /* None -> exclusive/none */ 2347 2348 if (cur_new_count != 0) { 2349 /* None -> exclusive */ 2350 qg->excl += num_bytes; 2351 qg->excl_cmpr += num_bytes; 2352 dirty = true; 2353 } 2354 /* None -> none, nothing changed */ 2355 } else { 2356 /* Exclusive -> exclusive/none */ 2357 2358 if (cur_new_count == 0) { 2359 /* Exclusive -> none */ 2360 qg->excl -= num_bytes; 2361 qg->excl_cmpr -= num_bytes; 2362 dirty = true; 2363 } 2364 /* Exclusive -> exclusive, nothing changed */ 2365 } 2366 } 2367 2368 if (dirty) 2369 qgroup_dirty(fs_info, qg); 2370 } 2371 return 0; 2372 } 2373 2374 /* 2375 * Check if the @roots potentially is a list of fs tree roots 2376 * 2377 * Return 0 for definitely not a fs/subvol tree roots ulist 2378 * Return 1 for possible fs/subvol tree roots in the list (considering an empty 2379 * one as well) 2380 */ 2381 static int maybe_fs_roots(struct ulist *roots) 2382 { 2383 struct ulist_node *unode; 2384 struct ulist_iterator uiter; 2385 2386 /* Empty one, still possible for fs roots */ 2387 if (!roots || roots->nnodes == 0) 2388 return 1; 2389 2390 ULIST_ITER_INIT(&uiter); 2391 unode = ulist_next(roots, &uiter); 2392 if (!unode) 2393 return 1; 2394 2395 /* 2396 * If it contains fs tree roots, then it must belong to fs/subvol 2397 * trees. 2398 * If it contains a non-fs tree, it won't be shared with fs/subvol trees. 2399 */ 2400 return is_fstree(unode->val); 2401 } 2402 2403 int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr, 2404 u64 num_bytes, struct ulist *old_roots, 2405 struct ulist *new_roots) 2406 { 2407 struct btrfs_fs_info *fs_info = trans->fs_info; 2408 struct ulist *qgroups = NULL; 2409 struct ulist *tmp = NULL; 2410 u64 seq; 2411 u64 nr_new_roots = 0; 2412 u64 nr_old_roots = 0; 2413 int ret = 0; 2414 2415 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 2416 return 0; 2417 2418 if (new_roots) { 2419 if (!maybe_fs_roots(new_roots)) 2420 goto out_free; 2421 nr_new_roots = new_roots->nnodes; 2422 } 2423 if (old_roots) { 2424 if (!maybe_fs_roots(old_roots)) 2425 goto out_free; 2426 nr_old_roots = old_roots->nnodes; 2427 } 2428 2429 /* Quick exit, either not fs tree roots, or won't affect any qgroup */ 2430 if (nr_old_roots == 0 && nr_new_roots == 0) 2431 goto out_free; 2432 2433 BUG_ON(!fs_info->quota_root); 2434 2435 trace_btrfs_qgroup_account_extent(fs_info, trans->transid, bytenr, 2436 num_bytes, nr_old_roots, nr_new_roots); 2437 2438 qgroups = ulist_alloc(GFP_NOFS); 2439 if (!qgroups) { 2440 ret = -ENOMEM; 2441 goto out_free; 2442 } 2443 tmp = ulist_alloc(GFP_NOFS); 2444 if (!tmp) { 2445 ret = -ENOMEM; 2446 goto out_free; 2447 } 2448 2449 mutex_lock(&fs_info->qgroup_rescan_lock); 2450 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 2451 if (fs_info->qgroup_rescan_progress.objectid <= bytenr) { 2452 mutex_unlock(&fs_info->qgroup_rescan_lock); 2453 ret = 0; 2454 goto out_free; 2455 } 2456 } 2457 mutex_unlock(&fs_info->qgroup_rescan_lock); 2458 2459 spin_lock(&fs_info->qgroup_lock); 2460 seq = fs_info->qgroup_seq; 2461 2462 /* Update old refcnts using old_roots */ 2463 ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq, 2464 UPDATE_OLD); 2465 if (ret < 0) 2466 goto out; 2467 2468 /* Update new refcnts using new_roots */ 2469 ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq, 2470 UPDATE_NEW); 2471 if (ret < 0) 2472 goto out; 2473 2474 qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots, 2475 num_bytes, seq); 2476 2477 /* 2478 * Bump qgroup_seq to avoid seq overlap 2479 */ 2480 fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1; 2481 out: 2482 spin_unlock(&fs_info->qgroup_lock); 2483 out_free: 2484 ulist_free(tmp); 2485 ulist_free(qgroups); 2486 ulist_free(old_roots); 2487 ulist_free(new_roots); 2488 return ret; 2489 } 2490 2491 int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans) 2492 { 2493 struct btrfs_fs_info *fs_info = trans->fs_info; 2494 struct btrfs_qgroup_extent_record *record; 2495 struct btrfs_delayed_ref_root *delayed_refs; 2496 struct ulist *new_roots = NULL; 2497 struct rb_node *node; 2498 u64 num_dirty_extents = 0; 2499 u64 qgroup_to_skip; 2500 int ret = 0; 2501 2502 delayed_refs = &trans->transaction->delayed_refs; 2503 qgroup_to_skip = delayed_refs->qgroup_to_skip; 2504 while ((node = rb_first(&delayed_refs->dirty_extent_root))) { 2505 record = rb_entry(node, struct btrfs_qgroup_extent_record, 2506 node); 2507 2508 num_dirty_extents++; 2509 trace_btrfs_qgroup_account_extents(fs_info, record); 2510 2511 if (!ret) { 2512 /* 2513 * Old roots should be searched when inserting qgroup 2514 * extent record 2515 */ 2516 if (WARN_ON(!record->old_roots)) { 2517 /* Search commit root to find old_roots */ 2518 ret = btrfs_find_all_roots(NULL, fs_info, 2519 record->bytenr, 0, 2520 &record->old_roots, false); 2521 if (ret < 0) 2522 goto cleanup; 2523 } 2524 2525 /* Free the reserved data space */ 2526 btrfs_qgroup_free_refroot(fs_info, 2527 record->data_rsv_refroot, 2528 record->data_rsv, 2529 BTRFS_QGROUP_RSV_DATA); 2530 /* 2531 * Use SEQ_LAST as time_seq to do special search, which 2532 * doesn't lock tree or delayed_refs and search current 2533 * root. It's safe inside commit_transaction(). 2534 */ 2535 ret = btrfs_find_all_roots(trans, fs_info, 2536 record->bytenr, SEQ_LAST, &new_roots, false); 2537 if (ret < 0) 2538 goto cleanup; 2539 if (qgroup_to_skip) { 2540 ulist_del(new_roots, qgroup_to_skip, 0); 2541 ulist_del(record->old_roots, qgroup_to_skip, 2542 0); 2543 } 2544 ret = btrfs_qgroup_account_extent(trans, record->bytenr, 2545 record->num_bytes, 2546 record->old_roots, 2547 new_roots); 2548 record->old_roots = NULL; 2549 new_roots = NULL; 2550 } 2551 cleanup: 2552 ulist_free(record->old_roots); 2553 ulist_free(new_roots); 2554 new_roots = NULL; 2555 rb_erase(node, &delayed_refs->dirty_extent_root); 2556 kfree(record); 2557 2558 } 2559 trace_qgroup_num_dirty_extents(fs_info, trans->transid, 2560 num_dirty_extents); 2561 return ret; 2562 } 2563 2564 /* 2565 * called from commit_transaction. Writes all changed qgroups to disk. 2566 */ 2567 int btrfs_run_qgroups(struct btrfs_trans_handle *trans) 2568 { 2569 struct btrfs_fs_info *fs_info = trans->fs_info; 2570 struct btrfs_root *quota_root = fs_info->quota_root; 2571 int ret = 0; 2572 2573 if (!quota_root) 2574 return ret; 2575 2576 spin_lock(&fs_info->qgroup_lock); 2577 while (!list_empty(&fs_info->dirty_qgroups)) { 2578 struct btrfs_qgroup *qgroup; 2579 qgroup = list_first_entry(&fs_info->dirty_qgroups, 2580 struct btrfs_qgroup, dirty); 2581 list_del_init(&qgroup->dirty); 2582 spin_unlock(&fs_info->qgroup_lock); 2583 ret = update_qgroup_info_item(trans, qgroup); 2584 if (ret) 2585 fs_info->qgroup_flags |= 2586 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 2587 ret = update_qgroup_limit_item(trans, qgroup); 2588 if (ret) 2589 fs_info->qgroup_flags |= 2590 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 2591 spin_lock(&fs_info->qgroup_lock); 2592 } 2593 if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 2594 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON; 2595 else 2596 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON; 2597 spin_unlock(&fs_info->qgroup_lock); 2598 2599 ret = update_qgroup_status_item(trans); 2600 if (ret) 2601 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 2602 2603 return ret; 2604 } 2605 2606 /* 2607 * Copy the accounting information between qgroups. This is necessary 2608 * when a snapshot or a subvolume is created. Throwing an error will 2609 * cause a transaction abort so we take extra care here to only error 2610 * when a readonly fs is a reasonable outcome. 2611 */ 2612 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid, 2613 u64 objectid, struct btrfs_qgroup_inherit *inherit) 2614 { 2615 int ret = 0; 2616 int i; 2617 u64 *i_qgroups; 2618 struct btrfs_fs_info *fs_info = trans->fs_info; 2619 struct btrfs_root *quota_root; 2620 struct btrfs_qgroup *srcgroup; 2621 struct btrfs_qgroup *dstgroup; 2622 u32 level_size = 0; 2623 u64 nums; 2624 2625 mutex_lock(&fs_info->qgroup_ioctl_lock); 2626 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 2627 goto out; 2628 2629 quota_root = fs_info->quota_root; 2630 if (!quota_root) { 2631 ret = -EINVAL; 2632 goto out; 2633 } 2634 2635 if (inherit) { 2636 i_qgroups = (u64 *)(inherit + 1); 2637 nums = inherit->num_qgroups + 2 * inherit->num_ref_copies + 2638 2 * inherit->num_excl_copies; 2639 for (i = 0; i < nums; ++i) { 2640 srcgroup = find_qgroup_rb(fs_info, *i_qgroups); 2641 2642 /* 2643 * Zero out invalid groups so we can ignore 2644 * them later. 2645 */ 2646 if (!srcgroup || 2647 ((srcgroup->qgroupid >> 48) <= (objectid >> 48))) 2648 *i_qgroups = 0ULL; 2649 2650 ++i_qgroups; 2651 } 2652 } 2653 2654 /* 2655 * create a tracking group for the subvol itself 2656 */ 2657 ret = add_qgroup_item(trans, quota_root, objectid); 2658 if (ret) 2659 goto out; 2660 2661 /* 2662 * add qgroup to all inherited groups 2663 */ 2664 if (inherit) { 2665 i_qgroups = (u64 *)(inherit + 1); 2666 for (i = 0; i < inherit->num_qgroups; ++i, ++i_qgroups) { 2667 if (*i_qgroups == 0) 2668 continue; 2669 ret = add_qgroup_relation_item(trans, objectid, 2670 *i_qgroups); 2671 if (ret && ret != -EEXIST) 2672 goto out; 2673 ret = add_qgroup_relation_item(trans, *i_qgroups, 2674 objectid); 2675 if (ret && ret != -EEXIST) 2676 goto out; 2677 } 2678 ret = 0; 2679 } 2680 2681 2682 spin_lock(&fs_info->qgroup_lock); 2683 2684 dstgroup = add_qgroup_rb(fs_info, objectid); 2685 if (IS_ERR(dstgroup)) { 2686 ret = PTR_ERR(dstgroup); 2687 goto unlock; 2688 } 2689 2690 if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) { 2691 dstgroup->lim_flags = inherit->lim.flags; 2692 dstgroup->max_rfer = inherit->lim.max_rfer; 2693 dstgroup->max_excl = inherit->lim.max_excl; 2694 dstgroup->rsv_rfer = inherit->lim.rsv_rfer; 2695 dstgroup->rsv_excl = inherit->lim.rsv_excl; 2696 2697 ret = update_qgroup_limit_item(trans, dstgroup); 2698 if (ret) { 2699 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 2700 btrfs_info(fs_info, 2701 "unable to update quota limit for %llu", 2702 dstgroup->qgroupid); 2703 goto unlock; 2704 } 2705 } 2706 2707 if (srcid) { 2708 srcgroup = find_qgroup_rb(fs_info, srcid); 2709 if (!srcgroup) 2710 goto unlock; 2711 2712 /* 2713 * We call inherit after we clone the root in order to make sure 2714 * our counts don't go crazy, so at this point the only 2715 * difference between the two roots should be the root node. 2716 */ 2717 level_size = fs_info->nodesize; 2718 dstgroup->rfer = srcgroup->rfer; 2719 dstgroup->rfer_cmpr = srcgroup->rfer_cmpr; 2720 dstgroup->excl = level_size; 2721 dstgroup->excl_cmpr = level_size; 2722 srcgroup->excl = level_size; 2723 srcgroup->excl_cmpr = level_size; 2724 2725 /* inherit the limit info */ 2726 dstgroup->lim_flags = srcgroup->lim_flags; 2727 dstgroup->max_rfer = srcgroup->max_rfer; 2728 dstgroup->max_excl = srcgroup->max_excl; 2729 dstgroup->rsv_rfer = srcgroup->rsv_rfer; 2730 dstgroup->rsv_excl = srcgroup->rsv_excl; 2731 2732 qgroup_dirty(fs_info, dstgroup); 2733 qgroup_dirty(fs_info, srcgroup); 2734 } 2735 2736 if (!inherit) 2737 goto unlock; 2738 2739 i_qgroups = (u64 *)(inherit + 1); 2740 for (i = 0; i < inherit->num_qgroups; ++i) { 2741 if (*i_qgroups) { 2742 ret = add_relation_rb(fs_info, objectid, *i_qgroups); 2743 if (ret) 2744 goto unlock; 2745 } 2746 ++i_qgroups; 2747 } 2748 2749 for (i = 0; i < inherit->num_ref_copies; ++i, i_qgroups += 2) { 2750 struct btrfs_qgroup *src; 2751 struct btrfs_qgroup *dst; 2752 2753 if (!i_qgroups[0] || !i_qgroups[1]) 2754 continue; 2755 2756 src = find_qgroup_rb(fs_info, i_qgroups[0]); 2757 dst = find_qgroup_rb(fs_info, i_qgroups[1]); 2758 2759 if (!src || !dst) { 2760 ret = -EINVAL; 2761 goto unlock; 2762 } 2763 2764 dst->rfer = src->rfer - level_size; 2765 dst->rfer_cmpr = src->rfer_cmpr - level_size; 2766 } 2767 for (i = 0; i < inherit->num_excl_copies; ++i, i_qgroups += 2) { 2768 struct btrfs_qgroup *src; 2769 struct btrfs_qgroup *dst; 2770 2771 if (!i_qgroups[0] || !i_qgroups[1]) 2772 continue; 2773 2774 src = find_qgroup_rb(fs_info, i_qgroups[0]); 2775 dst = find_qgroup_rb(fs_info, i_qgroups[1]); 2776 2777 if (!src || !dst) { 2778 ret = -EINVAL; 2779 goto unlock; 2780 } 2781 2782 dst->excl = src->excl + level_size; 2783 dst->excl_cmpr = src->excl_cmpr + level_size; 2784 } 2785 2786 unlock: 2787 spin_unlock(&fs_info->qgroup_lock); 2788 out: 2789 mutex_unlock(&fs_info->qgroup_ioctl_lock); 2790 return ret; 2791 } 2792 2793 /* 2794 * Two limits to commit transaction in advance. 2795 * 2796 * For RATIO, it will be 1/RATIO of the remaining limit as threshold. 2797 * For SIZE, it will be in byte unit as threshold. 2798 */ 2799 #define QGROUP_FREE_RATIO 32 2800 #define QGROUP_FREE_SIZE SZ_32M 2801 static bool qgroup_check_limits(struct btrfs_fs_info *fs_info, 2802 const struct btrfs_qgroup *qg, u64 num_bytes) 2803 { 2804 u64 free; 2805 u64 threshold; 2806 2807 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) && 2808 qgroup_rsv_total(qg) + (s64)qg->rfer + num_bytes > qg->max_rfer) 2809 return false; 2810 2811 if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) && 2812 qgroup_rsv_total(qg) + (s64)qg->excl + num_bytes > qg->max_excl) 2813 return false; 2814 2815 /* 2816 * Even if we passed the check, it's better to check if reservation 2817 * for meta_pertrans is pushing us near limit. 2818 * If there is too much pertrans reservation or it's near the limit, 2819 * let's try commit transaction to free some, using transaction_kthread 2820 */ 2821 if ((qg->lim_flags & (BTRFS_QGROUP_LIMIT_MAX_RFER | 2822 BTRFS_QGROUP_LIMIT_MAX_EXCL))) { 2823 if (qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) { 2824 free = qg->max_excl - qgroup_rsv_total(qg) - qg->excl; 2825 threshold = min_t(u64, qg->max_excl / QGROUP_FREE_RATIO, 2826 QGROUP_FREE_SIZE); 2827 } else { 2828 free = qg->max_rfer - qgroup_rsv_total(qg) - qg->rfer; 2829 threshold = min_t(u64, qg->max_rfer / QGROUP_FREE_RATIO, 2830 QGROUP_FREE_SIZE); 2831 } 2832 2833 /* 2834 * Use transaction_kthread to commit transaction, so we no 2835 * longer need to bother nested transaction nor lock context. 2836 */ 2837 if (free < threshold) 2838 btrfs_commit_transaction_locksafe(fs_info); 2839 } 2840 2841 return true; 2842 } 2843 2844 static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes, bool enforce, 2845 enum btrfs_qgroup_rsv_type type) 2846 { 2847 struct btrfs_root *quota_root; 2848 struct btrfs_qgroup *qgroup; 2849 struct btrfs_fs_info *fs_info = root->fs_info; 2850 u64 ref_root = root->root_key.objectid; 2851 int ret = 0; 2852 struct ulist_node *unode; 2853 struct ulist_iterator uiter; 2854 2855 if (!is_fstree(ref_root)) 2856 return 0; 2857 2858 if (num_bytes == 0) 2859 return 0; 2860 2861 if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) && 2862 capable(CAP_SYS_RESOURCE)) 2863 enforce = false; 2864 2865 spin_lock(&fs_info->qgroup_lock); 2866 quota_root = fs_info->quota_root; 2867 if (!quota_root) 2868 goto out; 2869 2870 qgroup = find_qgroup_rb(fs_info, ref_root); 2871 if (!qgroup) 2872 goto out; 2873 2874 /* 2875 * in a first step, we check all affected qgroups if any limits would 2876 * be exceeded 2877 */ 2878 ulist_reinit(fs_info->qgroup_ulist); 2879 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid, 2880 qgroup_to_aux(qgroup), GFP_ATOMIC); 2881 if (ret < 0) 2882 goto out; 2883 ULIST_ITER_INIT(&uiter); 2884 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { 2885 struct btrfs_qgroup *qg; 2886 struct btrfs_qgroup_list *glist; 2887 2888 qg = unode_aux_to_qgroup(unode); 2889 2890 if (enforce && !qgroup_check_limits(fs_info, qg, num_bytes)) { 2891 ret = -EDQUOT; 2892 goto out; 2893 } 2894 2895 list_for_each_entry(glist, &qg->groups, next_group) { 2896 ret = ulist_add(fs_info->qgroup_ulist, 2897 glist->group->qgroupid, 2898 qgroup_to_aux(glist->group), GFP_ATOMIC); 2899 if (ret < 0) 2900 goto out; 2901 } 2902 } 2903 ret = 0; 2904 /* 2905 * no limits exceeded, now record the reservation into all qgroups 2906 */ 2907 ULIST_ITER_INIT(&uiter); 2908 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { 2909 struct btrfs_qgroup *qg; 2910 2911 qg = unode_aux_to_qgroup(unode); 2912 2913 qgroup_rsv_add(fs_info, qg, num_bytes, type); 2914 } 2915 2916 out: 2917 spin_unlock(&fs_info->qgroup_lock); 2918 return ret; 2919 } 2920 2921 /* 2922 * Free @num_bytes of reserved space with @type for qgroup. (Normally level 0 2923 * qgroup). 2924 * 2925 * Will handle all higher level qgroup too. 2926 * 2927 * NOTE: If @num_bytes is (u64)-1, this means to free all bytes of this qgroup. 2928 * This special case is only used for META_PERTRANS type. 2929 */ 2930 void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info, 2931 u64 ref_root, u64 num_bytes, 2932 enum btrfs_qgroup_rsv_type type) 2933 { 2934 struct btrfs_root *quota_root; 2935 struct btrfs_qgroup *qgroup; 2936 struct ulist_node *unode; 2937 struct ulist_iterator uiter; 2938 int ret = 0; 2939 2940 if (!is_fstree(ref_root)) 2941 return; 2942 2943 if (num_bytes == 0) 2944 return; 2945 2946 if (num_bytes == (u64)-1 && type != BTRFS_QGROUP_RSV_META_PERTRANS) { 2947 WARN(1, "%s: Invalid type to free", __func__); 2948 return; 2949 } 2950 spin_lock(&fs_info->qgroup_lock); 2951 2952 quota_root = fs_info->quota_root; 2953 if (!quota_root) 2954 goto out; 2955 2956 qgroup = find_qgroup_rb(fs_info, ref_root); 2957 if (!qgroup) 2958 goto out; 2959 2960 if (num_bytes == (u64)-1) 2961 /* 2962 * We're freeing all pertrans rsv, get reserved value from 2963 * level 0 qgroup as real num_bytes to free. 2964 */ 2965 num_bytes = qgroup->rsv.values[type]; 2966 2967 ulist_reinit(fs_info->qgroup_ulist); 2968 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid, 2969 qgroup_to_aux(qgroup), GFP_ATOMIC); 2970 if (ret < 0) 2971 goto out; 2972 ULIST_ITER_INIT(&uiter); 2973 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { 2974 struct btrfs_qgroup *qg; 2975 struct btrfs_qgroup_list *glist; 2976 2977 qg = unode_aux_to_qgroup(unode); 2978 2979 qgroup_rsv_release(fs_info, qg, num_bytes, type); 2980 2981 list_for_each_entry(glist, &qg->groups, next_group) { 2982 ret = ulist_add(fs_info->qgroup_ulist, 2983 glist->group->qgroupid, 2984 qgroup_to_aux(glist->group), GFP_ATOMIC); 2985 if (ret < 0) 2986 goto out; 2987 } 2988 } 2989 2990 out: 2991 spin_unlock(&fs_info->qgroup_lock); 2992 } 2993 2994 /* 2995 * Check if the leaf is the last leaf. Which means all node pointers 2996 * are at their last position. 2997 */ 2998 static bool is_last_leaf(struct btrfs_path *path) 2999 { 3000 int i; 3001 3002 for (i = 1; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) { 3003 if (path->slots[i] != btrfs_header_nritems(path->nodes[i]) - 1) 3004 return false; 3005 } 3006 return true; 3007 } 3008 3009 /* 3010 * returns < 0 on error, 0 when more leafs are to be scanned. 3011 * returns 1 when done. 3012 */ 3013 static int qgroup_rescan_leaf(struct btrfs_trans_handle *trans, 3014 struct btrfs_path *path) 3015 { 3016 struct btrfs_fs_info *fs_info = trans->fs_info; 3017 struct btrfs_key found; 3018 struct extent_buffer *scratch_leaf = NULL; 3019 struct ulist *roots = NULL; 3020 u64 num_bytes; 3021 bool done; 3022 int slot; 3023 int ret; 3024 3025 mutex_lock(&fs_info->qgroup_rescan_lock); 3026 ret = btrfs_search_slot_for_read(fs_info->extent_root, 3027 &fs_info->qgroup_rescan_progress, 3028 path, 1, 0); 3029 3030 btrfs_debug(fs_info, 3031 "current progress key (%llu %u %llu), search_slot ret %d", 3032 fs_info->qgroup_rescan_progress.objectid, 3033 fs_info->qgroup_rescan_progress.type, 3034 fs_info->qgroup_rescan_progress.offset, ret); 3035 3036 if (ret) { 3037 /* 3038 * The rescan is about to end, we will not be scanning any 3039 * further blocks. We cannot unset the RESCAN flag here, because 3040 * we want to commit the transaction if everything went well. 3041 * To make the live accounting work in this phase, we set our 3042 * scan progress pointer such that every real extent objectid 3043 * will be smaller. 3044 */ 3045 fs_info->qgroup_rescan_progress.objectid = (u64)-1; 3046 btrfs_release_path(path); 3047 mutex_unlock(&fs_info->qgroup_rescan_lock); 3048 return ret; 3049 } 3050 done = is_last_leaf(path); 3051 3052 btrfs_item_key_to_cpu(path->nodes[0], &found, 3053 btrfs_header_nritems(path->nodes[0]) - 1); 3054 fs_info->qgroup_rescan_progress.objectid = found.objectid + 1; 3055 3056 scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]); 3057 if (!scratch_leaf) { 3058 ret = -ENOMEM; 3059 mutex_unlock(&fs_info->qgroup_rescan_lock); 3060 goto out; 3061 } 3062 slot = path->slots[0]; 3063 btrfs_release_path(path); 3064 mutex_unlock(&fs_info->qgroup_rescan_lock); 3065 3066 for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) { 3067 btrfs_item_key_to_cpu(scratch_leaf, &found, slot); 3068 if (found.type != BTRFS_EXTENT_ITEM_KEY && 3069 found.type != BTRFS_METADATA_ITEM_KEY) 3070 continue; 3071 if (found.type == BTRFS_METADATA_ITEM_KEY) 3072 num_bytes = fs_info->nodesize; 3073 else 3074 num_bytes = found.offset; 3075 3076 ret = btrfs_find_all_roots(NULL, fs_info, found.objectid, 0, 3077 &roots, false); 3078 if (ret < 0) 3079 goto out; 3080 /* For rescan, just pass old_roots as NULL */ 3081 ret = btrfs_qgroup_account_extent(trans, found.objectid, 3082 num_bytes, NULL, roots); 3083 if (ret < 0) 3084 goto out; 3085 } 3086 out: 3087 if (scratch_leaf) 3088 free_extent_buffer(scratch_leaf); 3089 3090 if (done && !ret) { 3091 ret = 1; 3092 fs_info->qgroup_rescan_progress.objectid = (u64)-1; 3093 } 3094 return ret; 3095 } 3096 3097 static void btrfs_qgroup_rescan_worker(struct btrfs_work *work) 3098 { 3099 struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info, 3100 qgroup_rescan_work); 3101 struct btrfs_path *path; 3102 struct btrfs_trans_handle *trans = NULL; 3103 int err = -ENOMEM; 3104 int ret = 0; 3105 3106 path = btrfs_alloc_path(); 3107 if (!path) 3108 goto out; 3109 /* 3110 * Rescan should only search for commit root, and any later difference 3111 * should be recorded by qgroup 3112 */ 3113 path->search_commit_root = 1; 3114 path->skip_locking = 1; 3115 3116 err = 0; 3117 while (!err && !btrfs_fs_closing(fs_info)) { 3118 trans = btrfs_start_transaction(fs_info->fs_root, 0); 3119 if (IS_ERR(trans)) { 3120 err = PTR_ERR(trans); 3121 break; 3122 } 3123 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) { 3124 err = -EINTR; 3125 } else { 3126 err = qgroup_rescan_leaf(trans, path); 3127 } 3128 if (err > 0) 3129 btrfs_commit_transaction(trans); 3130 else 3131 btrfs_end_transaction(trans); 3132 } 3133 3134 out: 3135 btrfs_free_path(path); 3136 3137 mutex_lock(&fs_info->qgroup_rescan_lock); 3138 if (!btrfs_fs_closing(fs_info)) 3139 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN; 3140 3141 if (err > 0 && 3142 fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) { 3143 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 3144 } else if (err < 0) { 3145 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 3146 } 3147 mutex_unlock(&fs_info->qgroup_rescan_lock); 3148 3149 /* 3150 * only update status, since the previous part has already updated the 3151 * qgroup info. 3152 */ 3153 trans = btrfs_start_transaction(fs_info->quota_root, 1); 3154 if (IS_ERR(trans)) { 3155 err = PTR_ERR(trans); 3156 btrfs_err(fs_info, 3157 "fail to start transaction for status update: %d", 3158 err); 3159 goto done; 3160 } 3161 ret = update_qgroup_status_item(trans); 3162 if (ret < 0) { 3163 err = ret; 3164 btrfs_err(fs_info, "fail to update qgroup status: %d", err); 3165 } 3166 btrfs_end_transaction(trans); 3167 3168 if (btrfs_fs_closing(fs_info)) { 3169 btrfs_info(fs_info, "qgroup scan paused"); 3170 } else if (err >= 0) { 3171 btrfs_info(fs_info, "qgroup scan completed%s", 3172 err > 0 ? " (inconsistency flag cleared)" : ""); 3173 } else { 3174 btrfs_err(fs_info, "qgroup scan failed with %d", err); 3175 } 3176 3177 done: 3178 mutex_lock(&fs_info->qgroup_rescan_lock); 3179 fs_info->qgroup_rescan_running = false; 3180 mutex_unlock(&fs_info->qgroup_rescan_lock); 3181 complete_all(&fs_info->qgroup_rescan_completion); 3182 } 3183 3184 /* 3185 * Checks that (a) no rescan is running and (b) quota is enabled. Allocates all 3186 * memory required for the rescan context. 3187 */ 3188 static int 3189 qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid, 3190 int init_flags) 3191 { 3192 int ret = 0; 3193 3194 if (!init_flags) { 3195 /* we're resuming qgroup rescan at mount time */ 3196 if (!(fs_info->qgroup_flags & 3197 BTRFS_QGROUP_STATUS_FLAG_RESCAN)) { 3198 btrfs_warn(fs_info, 3199 "qgroup rescan init failed, qgroup is not enabled"); 3200 ret = -EINVAL; 3201 } else if (!(fs_info->qgroup_flags & 3202 BTRFS_QGROUP_STATUS_FLAG_ON)) { 3203 btrfs_warn(fs_info, 3204 "qgroup rescan init failed, qgroup rescan is not queued"); 3205 ret = -EINVAL; 3206 } 3207 3208 if (ret) 3209 return ret; 3210 } 3211 3212 mutex_lock(&fs_info->qgroup_rescan_lock); 3213 spin_lock(&fs_info->qgroup_lock); 3214 3215 if (init_flags) { 3216 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) { 3217 btrfs_warn(fs_info, 3218 "qgroup rescan is already in progress"); 3219 ret = -EINPROGRESS; 3220 } else if (!(fs_info->qgroup_flags & 3221 BTRFS_QGROUP_STATUS_FLAG_ON)) { 3222 btrfs_warn(fs_info, 3223 "qgroup rescan init failed, qgroup is not enabled"); 3224 ret = -EINVAL; 3225 } 3226 3227 if (ret) { 3228 spin_unlock(&fs_info->qgroup_lock); 3229 mutex_unlock(&fs_info->qgroup_rescan_lock); 3230 return ret; 3231 } 3232 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN; 3233 } 3234 3235 memset(&fs_info->qgroup_rescan_progress, 0, 3236 sizeof(fs_info->qgroup_rescan_progress)); 3237 fs_info->qgroup_rescan_progress.objectid = progress_objectid; 3238 init_completion(&fs_info->qgroup_rescan_completion); 3239 fs_info->qgroup_rescan_running = true; 3240 3241 spin_unlock(&fs_info->qgroup_lock); 3242 mutex_unlock(&fs_info->qgroup_rescan_lock); 3243 3244 memset(&fs_info->qgroup_rescan_work, 0, 3245 sizeof(fs_info->qgroup_rescan_work)); 3246 btrfs_init_work(&fs_info->qgroup_rescan_work, 3247 btrfs_qgroup_rescan_helper, 3248 btrfs_qgroup_rescan_worker, NULL, NULL); 3249 return 0; 3250 } 3251 3252 static void 3253 qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info) 3254 { 3255 struct rb_node *n; 3256 struct btrfs_qgroup *qgroup; 3257 3258 spin_lock(&fs_info->qgroup_lock); 3259 /* clear all current qgroup tracking information */ 3260 for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) { 3261 qgroup = rb_entry(n, struct btrfs_qgroup, node); 3262 qgroup->rfer = 0; 3263 qgroup->rfer_cmpr = 0; 3264 qgroup->excl = 0; 3265 qgroup->excl_cmpr = 0; 3266 qgroup_dirty(fs_info, qgroup); 3267 } 3268 spin_unlock(&fs_info->qgroup_lock); 3269 } 3270 3271 int 3272 btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info) 3273 { 3274 int ret = 0; 3275 struct btrfs_trans_handle *trans; 3276 3277 ret = qgroup_rescan_init(fs_info, 0, 1); 3278 if (ret) 3279 return ret; 3280 3281 /* 3282 * We have set the rescan_progress to 0, which means no more 3283 * delayed refs will be accounted by btrfs_qgroup_account_ref. 3284 * However, btrfs_qgroup_account_ref may be right after its call 3285 * to btrfs_find_all_roots, in which case it would still do the 3286 * accounting. 3287 * To solve this, we're committing the transaction, which will 3288 * ensure we run all delayed refs and only after that, we are 3289 * going to clear all tracking information for a clean start. 3290 */ 3291 3292 trans = btrfs_join_transaction(fs_info->fs_root); 3293 if (IS_ERR(trans)) { 3294 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN; 3295 return PTR_ERR(trans); 3296 } 3297 ret = btrfs_commit_transaction(trans); 3298 if (ret) { 3299 fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN; 3300 return ret; 3301 } 3302 3303 qgroup_rescan_zero_tracking(fs_info); 3304 3305 btrfs_queue_work(fs_info->qgroup_rescan_workers, 3306 &fs_info->qgroup_rescan_work); 3307 3308 return 0; 3309 } 3310 3311 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info, 3312 bool interruptible) 3313 { 3314 int running; 3315 int ret = 0; 3316 3317 mutex_lock(&fs_info->qgroup_rescan_lock); 3318 spin_lock(&fs_info->qgroup_lock); 3319 running = fs_info->qgroup_rescan_running; 3320 spin_unlock(&fs_info->qgroup_lock); 3321 mutex_unlock(&fs_info->qgroup_rescan_lock); 3322 3323 if (!running) 3324 return 0; 3325 3326 if (interruptible) 3327 ret = wait_for_completion_interruptible( 3328 &fs_info->qgroup_rescan_completion); 3329 else 3330 wait_for_completion(&fs_info->qgroup_rescan_completion); 3331 3332 return ret; 3333 } 3334 3335 /* 3336 * this is only called from open_ctree where we're still single threaded, thus 3337 * locking is omitted here. 3338 */ 3339 void 3340 btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info) 3341 { 3342 if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) 3343 btrfs_queue_work(fs_info->qgroup_rescan_workers, 3344 &fs_info->qgroup_rescan_work); 3345 } 3346 3347 /* 3348 * Reserve qgroup space for range [start, start + len). 3349 * 3350 * This function will either reserve space from related qgroups or doing 3351 * nothing if the range is already reserved. 3352 * 3353 * Return 0 for successful reserve 3354 * Return <0 for error (including -EQUOT) 3355 * 3356 * NOTE: this function may sleep for memory allocation. 3357 * if btrfs_qgroup_reserve_data() is called multiple times with 3358 * same @reserved, caller must ensure when error happens it's OK 3359 * to free *ALL* reserved space. 3360 */ 3361 int btrfs_qgroup_reserve_data(struct inode *inode, 3362 struct extent_changeset **reserved_ret, u64 start, 3363 u64 len) 3364 { 3365 struct btrfs_root *root = BTRFS_I(inode)->root; 3366 struct ulist_node *unode; 3367 struct ulist_iterator uiter; 3368 struct extent_changeset *reserved; 3369 u64 orig_reserved; 3370 u64 to_reserve; 3371 int ret; 3372 3373 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) || 3374 !is_fstree(root->root_key.objectid) || len == 0) 3375 return 0; 3376 3377 /* @reserved parameter is mandatory for qgroup */ 3378 if (WARN_ON(!reserved_ret)) 3379 return -EINVAL; 3380 if (!*reserved_ret) { 3381 *reserved_ret = extent_changeset_alloc(); 3382 if (!*reserved_ret) 3383 return -ENOMEM; 3384 } 3385 reserved = *reserved_ret; 3386 /* Record already reserved space */ 3387 orig_reserved = reserved->bytes_changed; 3388 ret = set_record_extent_bits(&BTRFS_I(inode)->io_tree, start, 3389 start + len -1, EXTENT_QGROUP_RESERVED, reserved); 3390 3391 /* Newly reserved space */ 3392 to_reserve = reserved->bytes_changed - orig_reserved; 3393 trace_btrfs_qgroup_reserve_data(inode, start, len, 3394 to_reserve, QGROUP_RESERVE); 3395 if (ret < 0) 3396 goto cleanup; 3397 ret = qgroup_reserve(root, to_reserve, true, BTRFS_QGROUP_RSV_DATA); 3398 if (ret < 0) 3399 goto cleanup; 3400 3401 return ret; 3402 3403 cleanup: 3404 /* cleanup *ALL* already reserved ranges */ 3405 ULIST_ITER_INIT(&uiter); 3406 while ((unode = ulist_next(&reserved->range_changed, &uiter))) 3407 clear_extent_bit(&BTRFS_I(inode)->io_tree, unode->val, 3408 unode->aux, EXTENT_QGROUP_RESERVED, 0, 0, NULL); 3409 extent_changeset_release(reserved); 3410 return ret; 3411 } 3412 3413 /* Free ranges specified by @reserved, normally in error path */ 3414 static int qgroup_free_reserved_data(struct inode *inode, 3415 struct extent_changeset *reserved, u64 start, u64 len) 3416 { 3417 struct btrfs_root *root = BTRFS_I(inode)->root; 3418 struct ulist_node *unode; 3419 struct ulist_iterator uiter; 3420 struct extent_changeset changeset; 3421 int freed = 0; 3422 int ret; 3423 3424 extent_changeset_init(&changeset); 3425 len = round_up(start + len, root->fs_info->sectorsize); 3426 start = round_down(start, root->fs_info->sectorsize); 3427 3428 ULIST_ITER_INIT(&uiter); 3429 while ((unode = ulist_next(&reserved->range_changed, &uiter))) { 3430 u64 range_start = unode->val; 3431 /* unode->aux is the inclusive end */ 3432 u64 range_len = unode->aux - range_start + 1; 3433 u64 free_start; 3434 u64 free_len; 3435 3436 extent_changeset_release(&changeset); 3437 3438 /* Only free range in range [start, start + len) */ 3439 if (range_start >= start + len || 3440 range_start + range_len <= start) 3441 continue; 3442 free_start = max(range_start, start); 3443 free_len = min(start + len, range_start + range_len) - 3444 free_start; 3445 /* 3446 * TODO: To also modify reserved->ranges_reserved to reflect 3447 * the modification. 3448 * 3449 * However as long as we free qgroup reserved according to 3450 * EXTENT_QGROUP_RESERVED, we won't double free. 3451 * So not need to rush. 3452 */ 3453 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_failure_tree, 3454 free_start, free_start + free_len - 1, 3455 EXTENT_QGROUP_RESERVED, &changeset); 3456 if (ret < 0) 3457 goto out; 3458 freed += changeset.bytes_changed; 3459 } 3460 btrfs_qgroup_free_refroot(root->fs_info, root->root_key.objectid, freed, 3461 BTRFS_QGROUP_RSV_DATA); 3462 ret = freed; 3463 out: 3464 extent_changeset_release(&changeset); 3465 return ret; 3466 } 3467 3468 static int __btrfs_qgroup_release_data(struct inode *inode, 3469 struct extent_changeset *reserved, u64 start, u64 len, 3470 int free) 3471 { 3472 struct extent_changeset changeset; 3473 int trace_op = QGROUP_RELEASE; 3474 int ret; 3475 3476 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, 3477 &BTRFS_I(inode)->root->fs_info->flags)) 3478 return 0; 3479 3480 /* In release case, we shouldn't have @reserved */ 3481 WARN_ON(!free && reserved); 3482 if (free && reserved) 3483 return qgroup_free_reserved_data(inode, reserved, start, len); 3484 extent_changeset_init(&changeset); 3485 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, start, 3486 start + len -1, EXTENT_QGROUP_RESERVED, &changeset); 3487 if (ret < 0) 3488 goto out; 3489 3490 if (free) 3491 trace_op = QGROUP_FREE; 3492 trace_btrfs_qgroup_release_data(inode, start, len, 3493 changeset.bytes_changed, trace_op); 3494 if (free) 3495 btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info, 3496 BTRFS_I(inode)->root->root_key.objectid, 3497 changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA); 3498 ret = changeset.bytes_changed; 3499 out: 3500 extent_changeset_release(&changeset); 3501 return ret; 3502 } 3503 3504 /* 3505 * Free a reserved space range from io_tree and related qgroups 3506 * 3507 * Should be called when a range of pages get invalidated before reaching disk. 3508 * Or for error cleanup case. 3509 * if @reserved is given, only reserved range in [@start, @start + @len) will 3510 * be freed. 3511 * 3512 * For data written to disk, use btrfs_qgroup_release_data(). 3513 * 3514 * NOTE: This function may sleep for memory allocation. 3515 */ 3516 int btrfs_qgroup_free_data(struct inode *inode, 3517 struct extent_changeset *reserved, u64 start, u64 len) 3518 { 3519 return __btrfs_qgroup_release_data(inode, reserved, start, len, 1); 3520 } 3521 3522 /* 3523 * Release a reserved space range from io_tree only. 3524 * 3525 * Should be called when a range of pages get written to disk and corresponding 3526 * FILE_EXTENT is inserted into corresponding root. 3527 * 3528 * Since new qgroup accounting framework will only update qgroup numbers at 3529 * commit_transaction() time, its reserved space shouldn't be freed from 3530 * related qgroups. 3531 * 3532 * But we should release the range from io_tree, to allow further write to be 3533 * COWed. 3534 * 3535 * NOTE: This function may sleep for memory allocation. 3536 */ 3537 int btrfs_qgroup_release_data(struct inode *inode, u64 start, u64 len) 3538 { 3539 return __btrfs_qgroup_release_data(inode, NULL, start, len, 0); 3540 } 3541 3542 static void add_root_meta_rsv(struct btrfs_root *root, int num_bytes, 3543 enum btrfs_qgroup_rsv_type type) 3544 { 3545 if (type != BTRFS_QGROUP_RSV_META_PREALLOC && 3546 type != BTRFS_QGROUP_RSV_META_PERTRANS) 3547 return; 3548 if (num_bytes == 0) 3549 return; 3550 3551 spin_lock(&root->qgroup_meta_rsv_lock); 3552 if (type == BTRFS_QGROUP_RSV_META_PREALLOC) 3553 root->qgroup_meta_rsv_prealloc += num_bytes; 3554 else 3555 root->qgroup_meta_rsv_pertrans += num_bytes; 3556 spin_unlock(&root->qgroup_meta_rsv_lock); 3557 } 3558 3559 static int sub_root_meta_rsv(struct btrfs_root *root, int num_bytes, 3560 enum btrfs_qgroup_rsv_type type) 3561 { 3562 if (type != BTRFS_QGROUP_RSV_META_PREALLOC && 3563 type != BTRFS_QGROUP_RSV_META_PERTRANS) 3564 return 0; 3565 if (num_bytes == 0) 3566 return 0; 3567 3568 spin_lock(&root->qgroup_meta_rsv_lock); 3569 if (type == BTRFS_QGROUP_RSV_META_PREALLOC) { 3570 num_bytes = min_t(u64, root->qgroup_meta_rsv_prealloc, 3571 num_bytes); 3572 root->qgroup_meta_rsv_prealloc -= num_bytes; 3573 } else { 3574 num_bytes = min_t(u64, root->qgroup_meta_rsv_pertrans, 3575 num_bytes); 3576 root->qgroup_meta_rsv_pertrans -= num_bytes; 3577 } 3578 spin_unlock(&root->qgroup_meta_rsv_lock); 3579 return num_bytes; 3580 } 3581 3582 int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes, 3583 enum btrfs_qgroup_rsv_type type, bool enforce) 3584 { 3585 struct btrfs_fs_info *fs_info = root->fs_info; 3586 int ret; 3587 3588 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) || 3589 !is_fstree(root->root_key.objectid) || num_bytes == 0) 3590 return 0; 3591 3592 BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize)); 3593 trace_qgroup_meta_reserve(root, type, (s64)num_bytes); 3594 ret = qgroup_reserve(root, num_bytes, enforce, type); 3595 if (ret < 0) 3596 return ret; 3597 /* 3598 * Record what we have reserved into root. 3599 * 3600 * To avoid quota disabled->enabled underflow. 3601 * In that case, we may try to free space we haven't reserved 3602 * (since quota was disabled), so record what we reserved into root. 3603 * And ensure later release won't underflow this number. 3604 */ 3605 add_root_meta_rsv(root, num_bytes, type); 3606 return ret; 3607 } 3608 3609 void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root) 3610 { 3611 struct btrfs_fs_info *fs_info = root->fs_info; 3612 3613 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) || 3614 !is_fstree(root->root_key.objectid)) 3615 return; 3616 3617 /* TODO: Update trace point to handle such free */ 3618 trace_qgroup_meta_free_all_pertrans(root); 3619 /* Special value -1 means to free all reserved space */ 3620 btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid, (u64)-1, 3621 BTRFS_QGROUP_RSV_META_PERTRANS); 3622 } 3623 3624 void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes, 3625 enum btrfs_qgroup_rsv_type type) 3626 { 3627 struct btrfs_fs_info *fs_info = root->fs_info; 3628 3629 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) || 3630 !is_fstree(root->root_key.objectid)) 3631 return; 3632 3633 /* 3634 * reservation for META_PREALLOC can happen before quota is enabled, 3635 * which can lead to underflow. 3636 * Here ensure we will only free what we really have reserved. 3637 */ 3638 num_bytes = sub_root_meta_rsv(root, num_bytes, type); 3639 BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize)); 3640 trace_qgroup_meta_reserve(root, type, -(s64)num_bytes); 3641 btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid, 3642 num_bytes, type); 3643 } 3644 3645 static void qgroup_convert_meta(struct btrfs_fs_info *fs_info, u64 ref_root, 3646 int num_bytes) 3647 { 3648 struct btrfs_root *quota_root = fs_info->quota_root; 3649 struct btrfs_qgroup *qgroup; 3650 struct ulist_node *unode; 3651 struct ulist_iterator uiter; 3652 int ret = 0; 3653 3654 if (num_bytes == 0) 3655 return; 3656 if (!quota_root) 3657 return; 3658 3659 spin_lock(&fs_info->qgroup_lock); 3660 qgroup = find_qgroup_rb(fs_info, ref_root); 3661 if (!qgroup) 3662 goto out; 3663 ulist_reinit(fs_info->qgroup_ulist); 3664 ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid, 3665 qgroup_to_aux(qgroup), GFP_ATOMIC); 3666 if (ret < 0) 3667 goto out; 3668 ULIST_ITER_INIT(&uiter); 3669 while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) { 3670 struct btrfs_qgroup *qg; 3671 struct btrfs_qgroup_list *glist; 3672 3673 qg = unode_aux_to_qgroup(unode); 3674 3675 qgroup_rsv_release(fs_info, qg, num_bytes, 3676 BTRFS_QGROUP_RSV_META_PREALLOC); 3677 qgroup_rsv_add(fs_info, qg, num_bytes, 3678 BTRFS_QGROUP_RSV_META_PERTRANS); 3679 list_for_each_entry(glist, &qg->groups, next_group) { 3680 ret = ulist_add(fs_info->qgroup_ulist, 3681 glist->group->qgroupid, 3682 qgroup_to_aux(glist->group), GFP_ATOMIC); 3683 if (ret < 0) 3684 goto out; 3685 } 3686 } 3687 out: 3688 spin_unlock(&fs_info->qgroup_lock); 3689 } 3690 3691 void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes) 3692 { 3693 struct btrfs_fs_info *fs_info = root->fs_info; 3694 3695 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) || 3696 !is_fstree(root->root_key.objectid)) 3697 return; 3698 /* Same as btrfs_qgroup_free_meta_prealloc() */ 3699 num_bytes = sub_root_meta_rsv(root, num_bytes, 3700 BTRFS_QGROUP_RSV_META_PREALLOC); 3701 trace_qgroup_meta_convert(root, num_bytes); 3702 qgroup_convert_meta(fs_info, root->root_key.objectid, num_bytes); 3703 } 3704 3705 /* 3706 * Check qgroup reserved space leaking, normally at destroy inode 3707 * time 3708 */ 3709 void btrfs_qgroup_check_reserved_leak(struct inode *inode) 3710 { 3711 struct extent_changeset changeset; 3712 struct ulist_node *unode; 3713 struct ulist_iterator iter; 3714 int ret; 3715 3716 extent_changeset_init(&changeset); 3717 ret = clear_record_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1, 3718 EXTENT_QGROUP_RESERVED, &changeset); 3719 3720 WARN_ON(ret < 0); 3721 if (WARN_ON(changeset.bytes_changed)) { 3722 ULIST_ITER_INIT(&iter); 3723 while ((unode = ulist_next(&changeset.range_changed, &iter))) { 3724 btrfs_warn(BTRFS_I(inode)->root->fs_info, 3725 "leaking qgroup reserved space, ino: %lu, start: %llu, end: %llu", 3726 inode->i_ino, unode->val, unode->aux); 3727 } 3728 btrfs_qgroup_free_refroot(BTRFS_I(inode)->root->fs_info, 3729 BTRFS_I(inode)->root->root_key.objectid, 3730 changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA); 3731 3732 } 3733 extent_changeset_release(&changeset); 3734 } 3735 3736 void btrfs_qgroup_init_swapped_blocks( 3737 struct btrfs_qgroup_swapped_blocks *swapped_blocks) 3738 { 3739 int i; 3740 3741 spin_lock_init(&swapped_blocks->lock); 3742 for (i = 0; i < BTRFS_MAX_LEVEL; i++) 3743 swapped_blocks->blocks[i] = RB_ROOT; 3744 swapped_blocks->swapped = false; 3745 } 3746 3747 /* 3748 * Delete all swapped blocks record of @root. 3749 * Every record here means we skipped a full subtree scan for qgroup. 3750 * 3751 * Gets called when committing one transaction. 3752 */ 3753 void btrfs_qgroup_clean_swapped_blocks(struct btrfs_root *root) 3754 { 3755 struct btrfs_qgroup_swapped_blocks *swapped_blocks; 3756 int i; 3757 3758 swapped_blocks = &root->swapped_blocks; 3759 3760 spin_lock(&swapped_blocks->lock); 3761 if (!swapped_blocks->swapped) 3762 goto out; 3763 for (i = 0; i < BTRFS_MAX_LEVEL; i++) { 3764 struct rb_root *cur_root = &swapped_blocks->blocks[i]; 3765 struct btrfs_qgroup_swapped_block *entry; 3766 struct btrfs_qgroup_swapped_block *next; 3767 3768 rbtree_postorder_for_each_entry_safe(entry, next, cur_root, 3769 node) 3770 kfree(entry); 3771 swapped_blocks->blocks[i] = RB_ROOT; 3772 } 3773 swapped_blocks->swapped = false; 3774 out: 3775 spin_unlock(&swapped_blocks->lock); 3776 } 3777 3778 /* 3779 * Add subtree roots record into @subvol_root. 3780 * 3781 * @subvol_root: tree root of the subvolume tree get swapped 3782 * @bg: block group under balance 3783 * @subvol_parent/slot: pointer to the subtree root in subvolume tree 3784 * @reloc_parent/slot: pointer to the subtree root in reloc tree 3785 * BOTH POINTERS ARE BEFORE TREE SWAP 3786 * @last_snapshot: last snapshot generation of the subvolume tree 3787 */ 3788 int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans, 3789 struct btrfs_root *subvol_root, 3790 struct btrfs_block_group_cache *bg, 3791 struct extent_buffer *subvol_parent, int subvol_slot, 3792 struct extent_buffer *reloc_parent, int reloc_slot, 3793 u64 last_snapshot) 3794 { 3795 struct btrfs_fs_info *fs_info = subvol_root->fs_info; 3796 struct btrfs_qgroup_swapped_blocks *blocks = &subvol_root->swapped_blocks; 3797 struct btrfs_qgroup_swapped_block *block; 3798 struct rb_node **cur; 3799 struct rb_node *parent = NULL; 3800 int level = btrfs_header_level(subvol_parent) - 1; 3801 int ret = 0; 3802 3803 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 3804 return 0; 3805 3806 if (btrfs_node_ptr_generation(subvol_parent, subvol_slot) > 3807 btrfs_node_ptr_generation(reloc_parent, reloc_slot)) { 3808 btrfs_err_rl(fs_info, 3809 "%s: bad parameter order, subvol_gen=%llu reloc_gen=%llu", 3810 __func__, 3811 btrfs_node_ptr_generation(subvol_parent, subvol_slot), 3812 btrfs_node_ptr_generation(reloc_parent, reloc_slot)); 3813 return -EUCLEAN; 3814 } 3815 3816 block = kmalloc(sizeof(*block), GFP_NOFS); 3817 if (!block) { 3818 ret = -ENOMEM; 3819 goto out; 3820 } 3821 3822 /* 3823 * @reloc_parent/slot is still before swap, while @block is going to 3824 * record the bytenr after swap, so we do the swap here. 3825 */ 3826 block->subvol_bytenr = btrfs_node_blockptr(reloc_parent, reloc_slot); 3827 block->subvol_generation = btrfs_node_ptr_generation(reloc_parent, 3828 reloc_slot); 3829 block->reloc_bytenr = btrfs_node_blockptr(subvol_parent, subvol_slot); 3830 block->reloc_generation = btrfs_node_ptr_generation(subvol_parent, 3831 subvol_slot); 3832 block->last_snapshot = last_snapshot; 3833 block->level = level; 3834 if (bg->flags & BTRFS_BLOCK_GROUP_DATA) 3835 block->trace_leaf = true; 3836 else 3837 block->trace_leaf = false; 3838 btrfs_node_key_to_cpu(reloc_parent, &block->first_key, reloc_slot); 3839 3840 /* Insert @block into @blocks */ 3841 spin_lock(&blocks->lock); 3842 cur = &blocks->blocks[level].rb_node; 3843 while (*cur) { 3844 struct btrfs_qgroup_swapped_block *entry; 3845 3846 parent = *cur; 3847 entry = rb_entry(parent, struct btrfs_qgroup_swapped_block, 3848 node); 3849 3850 if (entry->subvol_bytenr < block->subvol_bytenr) { 3851 cur = &(*cur)->rb_left; 3852 } else if (entry->subvol_bytenr > block->subvol_bytenr) { 3853 cur = &(*cur)->rb_right; 3854 } else { 3855 if (entry->subvol_generation != 3856 block->subvol_generation || 3857 entry->reloc_bytenr != block->reloc_bytenr || 3858 entry->reloc_generation != 3859 block->reloc_generation) { 3860 /* 3861 * Duplicated but mismatch entry found. 3862 * Shouldn't happen. 3863 * 3864 * Marking qgroup inconsistent should be enough 3865 * for end users. 3866 */ 3867 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG)); 3868 ret = -EEXIST; 3869 } 3870 kfree(block); 3871 goto out_unlock; 3872 } 3873 } 3874 rb_link_node(&block->node, parent, cur); 3875 rb_insert_color(&block->node, &blocks->blocks[level]); 3876 blocks->swapped = true; 3877 out_unlock: 3878 spin_unlock(&blocks->lock); 3879 out: 3880 if (ret < 0) 3881 fs_info->qgroup_flags |= 3882 BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 3883 return ret; 3884 } 3885 3886 /* 3887 * Check if the tree block is a subtree root, and if so do the needed 3888 * delayed subtree trace for qgroup. 3889 * 3890 * This is called during btrfs_cow_block(). 3891 */ 3892 int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans, 3893 struct btrfs_root *root, 3894 struct extent_buffer *subvol_eb) 3895 { 3896 struct btrfs_fs_info *fs_info = root->fs_info; 3897 struct btrfs_qgroup_swapped_blocks *blocks = &root->swapped_blocks; 3898 struct btrfs_qgroup_swapped_block *block; 3899 struct extent_buffer *reloc_eb = NULL; 3900 struct rb_node *node; 3901 bool found = false; 3902 bool swapped = false; 3903 int level = btrfs_header_level(subvol_eb); 3904 int ret = 0; 3905 int i; 3906 3907 if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) 3908 return 0; 3909 if (!is_fstree(root->root_key.objectid) || !root->reloc_root) 3910 return 0; 3911 3912 spin_lock(&blocks->lock); 3913 if (!blocks->swapped) { 3914 spin_unlock(&blocks->lock); 3915 return 0; 3916 } 3917 node = blocks->blocks[level].rb_node; 3918 3919 while (node) { 3920 block = rb_entry(node, struct btrfs_qgroup_swapped_block, node); 3921 if (block->subvol_bytenr < subvol_eb->start) { 3922 node = node->rb_left; 3923 } else if (block->subvol_bytenr > subvol_eb->start) { 3924 node = node->rb_right; 3925 } else { 3926 found = true; 3927 break; 3928 } 3929 } 3930 if (!found) { 3931 spin_unlock(&blocks->lock); 3932 goto out; 3933 } 3934 /* Found one, remove it from @blocks first and update blocks->swapped */ 3935 rb_erase(&block->node, &blocks->blocks[level]); 3936 for (i = 0; i < BTRFS_MAX_LEVEL; i++) { 3937 if (RB_EMPTY_ROOT(&blocks->blocks[i])) { 3938 swapped = true; 3939 break; 3940 } 3941 } 3942 blocks->swapped = swapped; 3943 spin_unlock(&blocks->lock); 3944 3945 /* Read out reloc subtree root */ 3946 reloc_eb = read_tree_block(fs_info, block->reloc_bytenr, 3947 block->reloc_generation, block->level, 3948 &block->first_key); 3949 if (IS_ERR(reloc_eb)) { 3950 ret = PTR_ERR(reloc_eb); 3951 reloc_eb = NULL; 3952 goto free_out; 3953 } 3954 if (!extent_buffer_uptodate(reloc_eb)) { 3955 ret = -EIO; 3956 goto free_out; 3957 } 3958 3959 ret = qgroup_trace_subtree_swap(trans, reloc_eb, subvol_eb, 3960 block->last_snapshot, block->trace_leaf); 3961 free_out: 3962 kfree(block); 3963 free_extent_buffer(reloc_eb); 3964 out: 3965 if (ret < 0) { 3966 btrfs_err_rl(fs_info, 3967 "failed to account subtree at bytenr %llu: %d", 3968 subvol_eb->start, ret); 3969 fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; 3970 } 3971 return ret; 3972 } 3973