Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 STRATO. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/pagemap.h> |
| 21 | #include <linux/writeback.h> |
| 22 | #include <linux/blkdev.h> |
| 23 | #include <linux/rbtree.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/workqueue.h> |
Filipe Brandenburger | 55e301f | 2013-01-29 06:04:50 +0000 | [diff] [blame] | 26 | #include <linux/btrfs.h> |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 27 | |
| 28 | #include "ctree.h" |
| 29 | #include "transaction.h" |
| 30 | #include "disk-io.h" |
| 31 | #include "locking.h" |
| 32 | #include "ulist.h" |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 33 | #include "backref.h" |
| 34 | |
| 35 | /* TODO XXX FIXME |
| 36 | * - subvol delete -> delete when ref goes to 0? delete limits also? |
| 37 | * - reorganize keys |
| 38 | * - compressed |
| 39 | * - sync |
| 40 | * - rescan |
| 41 | * - copy also limits on subvol creation |
| 42 | * - limit |
| 43 | * - caches fuer ulists |
| 44 | * - performance benchmarks |
| 45 | * - check all ioctl parameters |
| 46 | */ |
| 47 | |
| 48 | /* |
| 49 | * one struct for each qgroup, organized in fs_info->qgroup_tree. |
| 50 | */ |
| 51 | struct btrfs_qgroup { |
| 52 | u64 qgroupid; |
| 53 | |
| 54 | /* |
| 55 | * state |
| 56 | */ |
| 57 | u64 rfer; /* referenced */ |
| 58 | u64 rfer_cmpr; /* referenced compressed */ |
| 59 | u64 excl; /* exclusive */ |
| 60 | u64 excl_cmpr; /* exclusive compressed */ |
| 61 | |
| 62 | /* |
| 63 | * limits |
| 64 | */ |
| 65 | u64 lim_flags; /* which limits are set */ |
| 66 | u64 max_rfer; |
| 67 | u64 max_excl; |
| 68 | u64 rsv_rfer; |
| 69 | u64 rsv_excl; |
| 70 | |
| 71 | /* |
| 72 | * reservation tracking |
| 73 | */ |
| 74 | u64 reserved; |
| 75 | |
| 76 | /* |
| 77 | * lists |
| 78 | */ |
| 79 | struct list_head groups; /* groups this group is member of */ |
| 80 | struct list_head members; /* groups that are members of this group */ |
| 81 | struct list_head dirty; /* dirty groups */ |
| 82 | struct rb_node node; /* tree of qgroups */ |
| 83 | |
| 84 | /* |
| 85 | * temp variables for accounting operations |
| 86 | */ |
| 87 | u64 tag; |
| 88 | u64 refcnt; |
| 89 | }; |
| 90 | |
| 91 | /* |
| 92 | * glue structure to represent the relations between qgroups. |
| 93 | */ |
| 94 | struct btrfs_qgroup_list { |
| 95 | struct list_head next_group; |
| 96 | struct list_head next_member; |
| 97 | struct btrfs_qgroup *group; |
| 98 | struct btrfs_qgroup *member; |
| 99 | }; |
| 100 | |
| 101 | /* must be called with qgroup_lock held */ |
| 102 | static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info, |
| 103 | u64 qgroupid) |
| 104 | { |
| 105 | struct rb_node *n = fs_info->qgroup_tree.rb_node; |
| 106 | struct btrfs_qgroup *qgroup; |
| 107 | |
| 108 | while (n) { |
| 109 | qgroup = rb_entry(n, struct btrfs_qgroup, node); |
| 110 | if (qgroup->qgroupid < qgroupid) |
| 111 | n = n->rb_left; |
| 112 | else if (qgroup->qgroupid > qgroupid) |
| 113 | n = n->rb_right; |
| 114 | else |
| 115 | return qgroup; |
| 116 | } |
| 117 | return NULL; |
| 118 | } |
| 119 | |
| 120 | /* must be called with qgroup_lock held */ |
| 121 | static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info, |
| 122 | u64 qgroupid) |
| 123 | { |
| 124 | struct rb_node **p = &fs_info->qgroup_tree.rb_node; |
| 125 | struct rb_node *parent = NULL; |
| 126 | struct btrfs_qgroup *qgroup; |
| 127 | |
| 128 | while (*p) { |
| 129 | parent = *p; |
| 130 | qgroup = rb_entry(parent, struct btrfs_qgroup, node); |
| 131 | |
| 132 | if (qgroup->qgroupid < qgroupid) |
| 133 | p = &(*p)->rb_left; |
| 134 | else if (qgroup->qgroupid > qgroupid) |
| 135 | p = &(*p)->rb_right; |
| 136 | else |
| 137 | return qgroup; |
| 138 | } |
| 139 | |
| 140 | qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC); |
| 141 | if (!qgroup) |
| 142 | return ERR_PTR(-ENOMEM); |
| 143 | |
| 144 | qgroup->qgroupid = qgroupid; |
| 145 | INIT_LIST_HEAD(&qgroup->groups); |
| 146 | INIT_LIST_HEAD(&qgroup->members); |
| 147 | INIT_LIST_HEAD(&qgroup->dirty); |
| 148 | |
| 149 | rb_link_node(&qgroup->node, parent, p); |
| 150 | rb_insert_color(&qgroup->node, &fs_info->qgroup_tree); |
| 151 | |
| 152 | return qgroup; |
| 153 | } |
| 154 | |
| 155 | /* must be called with qgroup_lock held */ |
| 156 | static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid) |
| 157 | { |
| 158 | struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid); |
| 159 | struct btrfs_qgroup_list *list; |
| 160 | |
| 161 | if (!qgroup) |
| 162 | return -ENOENT; |
| 163 | |
| 164 | rb_erase(&qgroup->node, &fs_info->qgroup_tree); |
| 165 | list_del(&qgroup->dirty); |
| 166 | |
| 167 | while (!list_empty(&qgroup->groups)) { |
| 168 | list = list_first_entry(&qgroup->groups, |
| 169 | struct btrfs_qgroup_list, next_group); |
| 170 | list_del(&list->next_group); |
| 171 | list_del(&list->next_member); |
| 172 | kfree(list); |
| 173 | } |
| 174 | |
| 175 | while (!list_empty(&qgroup->members)) { |
| 176 | list = list_first_entry(&qgroup->members, |
| 177 | struct btrfs_qgroup_list, next_member); |
| 178 | list_del(&list->next_group); |
| 179 | list_del(&list->next_member); |
| 180 | kfree(list); |
| 181 | } |
| 182 | kfree(qgroup); |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | /* must be called with qgroup_lock held */ |
| 188 | static int add_relation_rb(struct btrfs_fs_info *fs_info, |
| 189 | u64 memberid, u64 parentid) |
| 190 | { |
| 191 | struct btrfs_qgroup *member; |
| 192 | struct btrfs_qgroup *parent; |
| 193 | struct btrfs_qgroup_list *list; |
| 194 | |
| 195 | member = find_qgroup_rb(fs_info, memberid); |
| 196 | parent = find_qgroup_rb(fs_info, parentid); |
| 197 | if (!member || !parent) |
| 198 | return -ENOENT; |
| 199 | |
| 200 | list = kzalloc(sizeof(*list), GFP_ATOMIC); |
| 201 | if (!list) |
| 202 | return -ENOMEM; |
| 203 | |
| 204 | list->group = parent; |
| 205 | list->member = member; |
| 206 | list_add_tail(&list->next_group, &member->groups); |
| 207 | list_add_tail(&list->next_member, &parent->members); |
| 208 | |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | /* must be called with qgroup_lock held */ |
| 213 | static int del_relation_rb(struct btrfs_fs_info *fs_info, |
| 214 | u64 memberid, u64 parentid) |
| 215 | { |
| 216 | struct btrfs_qgroup *member; |
| 217 | struct btrfs_qgroup *parent; |
| 218 | struct btrfs_qgroup_list *list; |
| 219 | |
| 220 | member = find_qgroup_rb(fs_info, memberid); |
| 221 | parent = find_qgroup_rb(fs_info, parentid); |
| 222 | if (!member || !parent) |
| 223 | return -ENOENT; |
| 224 | |
| 225 | list_for_each_entry(list, &member->groups, next_group) { |
| 226 | if (list->group == parent) { |
| 227 | list_del(&list->next_group); |
| 228 | list_del(&list->next_member); |
| 229 | kfree(list); |
| 230 | return 0; |
| 231 | } |
| 232 | } |
| 233 | return -ENOENT; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * The full config is read in one go, only called from open_ctree() |
| 238 | * It doesn't use any locking, as at this point we're still single-threaded |
| 239 | */ |
| 240 | int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info) |
| 241 | { |
| 242 | struct btrfs_key key; |
| 243 | struct btrfs_key found_key; |
| 244 | struct btrfs_root *quota_root = fs_info->quota_root; |
| 245 | struct btrfs_path *path = NULL; |
| 246 | struct extent_buffer *l; |
| 247 | int slot; |
| 248 | int ret = 0; |
| 249 | u64 flags = 0; |
| 250 | |
| 251 | if (!fs_info->quota_enabled) |
| 252 | return 0; |
| 253 | |
| 254 | path = btrfs_alloc_path(); |
| 255 | if (!path) { |
| 256 | ret = -ENOMEM; |
| 257 | goto out; |
| 258 | } |
| 259 | |
| 260 | /* default this to quota off, in case no status key is found */ |
| 261 | fs_info->qgroup_flags = 0; |
| 262 | |
| 263 | /* |
| 264 | * pass 1: read status, all qgroup infos and limits |
| 265 | */ |
| 266 | key.objectid = 0; |
| 267 | key.type = 0; |
| 268 | key.offset = 0; |
| 269 | ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1); |
| 270 | if (ret) |
| 271 | goto out; |
| 272 | |
| 273 | while (1) { |
| 274 | struct btrfs_qgroup *qgroup; |
| 275 | |
| 276 | slot = path->slots[0]; |
| 277 | l = path->nodes[0]; |
| 278 | btrfs_item_key_to_cpu(l, &found_key, slot); |
| 279 | |
| 280 | if (found_key.type == BTRFS_QGROUP_STATUS_KEY) { |
| 281 | struct btrfs_qgroup_status_item *ptr; |
| 282 | |
| 283 | ptr = btrfs_item_ptr(l, slot, |
| 284 | struct btrfs_qgroup_status_item); |
| 285 | |
| 286 | if (btrfs_qgroup_status_version(l, ptr) != |
| 287 | BTRFS_QGROUP_STATUS_VERSION) { |
| 288 | printk(KERN_ERR |
| 289 | "btrfs: old qgroup version, quota disabled\n"); |
| 290 | goto out; |
| 291 | } |
| 292 | if (btrfs_qgroup_status_generation(l, ptr) != |
| 293 | fs_info->generation) { |
| 294 | flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; |
| 295 | printk(KERN_ERR |
| 296 | "btrfs: qgroup generation mismatch, " |
| 297 | "marked as inconsistent\n"); |
| 298 | } |
| 299 | fs_info->qgroup_flags = btrfs_qgroup_status_flags(l, |
| 300 | ptr); |
| 301 | /* FIXME read scan element */ |
| 302 | goto next1; |
| 303 | } |
| 304 | |
| 305 | if (found_key.type != BTRFS_QGROUP_INFO_KEY && |
| 306 | found_key.type != BTRFS_QGROUP_LIMIT_KEY) |
| 307 | goto next1; |
| 308 | |
| 309 | qgroup = find_qgroup_rb(fs_info, found_key.offset); |
| 310 | if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) || |
| 311 | (!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) { |
| 312 | printk(KERN_ERR "btrfs: inconsitent qgroup config\n"); |
| 313 | flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; |
| 314 | } |
| 315 | if (!qgroup) { |
| 316 | qgroup = add_qgroup_rb(fs_info, found_key.offset); |
| 317 | if (IS_ERR(qgroup)) { |
| 318 | ret = PTR_ERR(qgroup); |
| 319 | goto out; |
| 320 | } |
| 321 | } |
| 322 | switch (found_key.type) { |
| 323 | case BTRFS_QGROUP_INFO_KEY: { |
| 324 | struct btrfs_qgroup_info_item *ptr; |
| 325 | |
| 326 | ptr = btrfs_item_ptr(l, slot, |
| 327 | struct btrfs_qgroup_info_item); |
| 328 | qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr); |
| 329 | qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr); |
| 330 | qgroup->excl = btrfs_qgroup_info_excl(l, ptr); |
| 331 | qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr); |
| 332 | /* generation currently unused */ |
| 333 | break; |
| 334 | } |
| 335 | case BTRFS_QGROUP_LIMIT_KEY: { |
| 336 | struct btrfs_qgroup_limit_item *ptr; |
| 337 | |
| 338 | ptr = btrfs_item_ptr(l, slot, |
| 339 | struct btrfs_qgroup_limit_item); |
| 340 | qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr); |
| 341 | qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr); |
| 342 | qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr); |
| 343 | qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr); |
| 344 | qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr); |
| 345 | break; |
| 346 | } |
| 347 | } |
| 348 | next1: |
| 349 | ret = btrfs_next_item(quota_root, path); |
| 350 | if (ret < 0) |
| 351 | goto out; |
| 352 | if (ret) |
| 353 | break; |
| 354 | } |
| 355 | btrfs_release_path(path); |
| 356 | |
| 357 | /* |
| 358 | * pass 2: read all qgroup relations |
| 359 | */ |
| 360 | key.objectid = 0; |
| 361 | key.type = BTRFS_QGROUP_RELATION_KEY; |
| 362 | key.offset = 0; |
| 363 | ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0); |
| 364 | if (ret) |
| 365 | goto out; |
| 366 | while (1) { |
| 367 | slot = path->slots[0]; |
| 368 | l = path->nodes[0]; |
| 369 | btrfs_item_key_to_cpu(l, &found_key, slot); |
| 370 | |
| 371 | if (found_key.type != BTRFS_QGROUP_RELATION_KEY) |
| 372 | goto next2; |
| 373 | |
| 374 | if (found_key.objectid > found_key.offset) { |
| 375 | /* parent <- member, not needed to build config */ |
| 376 | /* FIXME should we omit the key completely? */ |
| 377 | goto next2; |
| 378 | } |
| 379 | |
| 380 | ret = add_relation_rb(fs_info, found_key.objectid, |
| 381 | found_key.offset); |
Arne Jansen | ff24858 | 2013-01-17 01:22:08 -0700 | [diff] [blame] | 382 | if (ret == -ENOENT) { |
| 383 | printk(KERN_WARNING |
| 384 | "btrfs: orphan qgroup relation 0x%llx->0x%llx\n", |
| 385 | (unsigned long long)found_key.objectid, |
| 386 | (unsigned long long)found_key.offset); |
| 387 | ret = 0; /* ignore the error */ |
| 388 | } |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 389 | if (ret) |
| 390 | goto out; |
| 391 | next2: |
| 392 | ret = btrfs_next_item(quota_root, path); |
| 393 | if (ret < 0) |
| 394 | goto out; |
| 395 | if (ret) |
| 396 | break; |
| 397 | } |
| 398 | out: |
| 399 | fs_info->qgroup_flags |= flags; |
| 400 | if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON)) { |
| 401 | fs_info->quota_enabled = 0; |
| 402 | fs_info->pending_quota_state = 0; |
| 403 | } |
| 404 | btrfs_free_path(path); |
| 405 | |
| 406 | return ret < 0 ? ret : 0; |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * This is only called from close_ctree() or open_ctree(), both in single- |
| 411 | * treaded paths. Clean up the in-memory structures. No locking needed. |
| 412 | */ |
| 413 | void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info) |
| 414 | { |
| 415 | struct rb_node *n; |
| 416 | struct btrfs_qgroup *qgroup; |
| 417 | struct btrfs_qgroup_list *list; |
| 418 | |
| 419 | while ((n = rb_first(&fs_info->qgroup_tree))) { |
| 420 | qgroup = rb_entry(n, struct btrfs_qgroup, node); |
| 421 | rb_erase(n, &fs_info->qgroup_tree); |
| 422 | |
| 423 | WARN_ON(!list_empty(&qgroup->dirty)); |
| 424 | |
| 425 | while (!list_empty(&qgroup->groups)) { |
| 426 | list = list_first_entry(&qgroup->groups, |
| 427 | struct btrfs_qgroup_list, |
| 428 | next_group); |
| 429 | list_del(&list->next_group); |
| 430 | list_del(&list->next_member); |
| 431 | kfree(list); |
| 432 | } |
| 433 | |
| 434 | while (!list_empty(&qgroup->members)) { |
| 435 | list = list_first_entry(&qgroup->members, |
| 436 | struct btrfs_qgroup_list, |
| 437 | next_member); |
| 438 | list_del(&list->next_group); |
| 439 | list_del(&list->next_member); |
| 440 | kfree(list); |
| 441 | } |
| 442 | kfree(qgroup); |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | static int add_qgroup_relation_item(struct btrfs_trans_handle *trans, |
| 447 | struct btrfs_root *quota_root, |
| 448 | u64 src, u64 dst) |
| 449 | { |
| 450 | int ret; |
| 451 | struct btrfs_path *path; |
| 452 | struct btrfs_key key; |
| 453 | |
| 454 | path = btrfs_alloc_path(); |
| 455 | if (!path) |
| 456 | return -ENOMEM; |
| 457 | |
| 458 | key.objectid = src; |
| 459 | key.type = BTRFS_QGROUP_RELATION_KEY; |
| 460 | key.offset = dst; |
| 461 | |
| 462 | ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0); |
| 463 | |
| 464 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 465 | |
| 466 | btrfs_free_path(path); |
| 467 | return ret; |
| 468 | } |
| 469 | |
| 470 | static int del_qgroup_relation_item(struct btrfs_trans_handle *trans, |
| 471 | struct btrfs_root *quota_root, |
| 472 | u64 src, u64 dst) |
| 473 | { |
| 474 | int ret; |
| 475 | struct btrfs_path *path; |
| 476 | struct btrfs_key key; |
| 477 | |
| 478 | path = btrfs_alloc_path(); |
| 479 | if (!path) |
| 480 | return -ENOMEM; |
| 481 | |
| 482 | key.objectid = src; |
| 483 | key.type = BTRFS_QGROUP_RELATION_KEY; |
| 484 | key.offset = dst; |
| 485 | |
| 486 | ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); |
| 487 | if (ret < 0) |
| 488 | goto out; |
| 489 | |
| 490 | if (ret > 0) { |
| 491 | ret = -ENOENT; |
| 492 | goto out; |
| 493 | } |
| 494 | |
| 495 | ret = btrfs_del_item(trans, quota_root, path); |
| 496 | out: |
| 497 | btrfs_free_path(path); |
| 498 | return ret; |
| 499 | } |
| 500 | |
| 501 | static int add_qgroup_item(struct btrfs_trans_handle *trans, |
| 502 | struct btrfs_root *quota_root, u64 qgroupid) |
| 503 | { |
| 504 | int ret; |
| 505 | struct btrfs_path *path; |
| 506 | struct btrfs_qgroup_info_item *qgroup_info; |
| 507 | struct btrfs_qgroup_limit_item *qgroup_limit; |
| 508 | struct extent_buffer *leaf; |
| 509 | struct btrfs_key key; |
| 510 | |
| 511 | path = btrfs_alloc_path(); |
| 512 | if (!path) |
| 513 | return -ENOMEM; |
| 514 | |
| 515 | key.objectid = 0; |
| 516 | key.type = BTRFS_QGROUP_INFO_KEY; |
| 517 | key.offset = qgroupid; |
| 518 | |
| 519 | ret = btrfs_insert_empty_item(trans, quota_root, path, &key, |
| 520 | sizeof(*qgroup_info)); |
| 521 | if (ret) |
| 522 | goto out; |
| 523 | |
| 524 | leaf = path->nodes[0]; |
| 525 | qgroup_info = btrfs_item_ptr(leaf, path->slots[0], |
| 526 | struct btrfs_qgroup_info_item); |
| 527 | btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid); |
| 528 | btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0); |
| 529 | btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0); |
| 530 | btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0); |
| 531 | btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0); |
| 532 | |
| 533 | btrfs_mark_buffer_dirty(leaf); |
| 534 | |
| 535 | btrfs_release_path(path); |
| 536 | |
| 537 | key.type = BTRFS_QGROUP_LIMIT_KEY; |
| 538 | ret = btrfs_insert_empty_item(trans, quota_root, path, &key, |
| 539 | sizeof(*qgroup_limit)); |
| 540 | if (ret) |
| 541 | goto out; |
| 542 | |
| 543 | leaf = path->nodes[0]; |
| 544 | qgroup_limit = btrfs_item_ptr(leaf, path->slots[0], |
| 545 | struct btrfs_qgroup_limit_item); |
| 546 | btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0); |
| 547 | btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0); |
| 548 | btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0); |
| 549 | btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0); |
| 550 | btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0); |
| 551 | |
| 552 | btrfs_mark_buffer_dirty(leaf); |
| 553 | |
| 554 | ret = 0; |
| 555 | out: |
| 556 | btrfs_free_path(path); |
| 557 | return ret; |
| 558 | } |
| 559 | |
| 560 | static int del_qgroup_item(struct btrfs_trans_handle *trans, |
| 561 | struct btrfs_root *quota_root, u64 qgroupid) |
| 562 | { |
| 563 | int ret; |
| 564 | struct btrfs_path *path; |
| 565 | struct btrfs_key key; |
| 566 | |
| 567 | path = btrfs_alloc_path(); |
| 568 | if (!path) |
| 569 | return -ENOMEM; |
| 570 | |
| 571 | key.objectid = 0; |
| 572 | key.type = BTRFS_QGROUP_INFO_KEY; |
| 573 | key.offset = qgroupid; |
| 574 | ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); |
| 575 | if (ret < 0) |
| 576 | goto out; |
| 577 | |
| 578 | if (ret > 0) { |
| 579 | ret = -ENOENT; |
| 580 | goto out; |
| 581 | } |
| 582 | |
| 583 | ret = btrfs_del_item(trans, quota_root, path); |
| 584 | if (ret) |
| 585 | goto out; |
| 586 | |
| 587 | btrfs_release_path(path); |
| 588 | |
| 589 | key.type = BTRFS_QGROUP_LIMIT_KEY; |
| 590 | ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1); |
| 591 | if (ret < 0) |
| 592 | goto out; |
| 593 | |
| 594 | if (ret > 0) { |
| 595 | ret = -ENOENT; |
| 596 | goto out; |
| 597 | } |
| 598 | |
| 599 | ret = btrfs_del_item(trans, quota_root, path); |
| 600 | |
| 601 | out: |
| 602 | btrfs_free_path(path); |
| 603 | return ret; |
| 604 | } |
| 605 | |
| 606 | static int update_qgroup_limit_item(struct btrfs_trans_handle *trans, |
| 607 | struct btrfs_root *root, u64 qgroupid, |
| 608 | u64 flags, u64 max_rfer, u64 max_excl, |
| 609 | u64 rsv_rfer, u64 rsv_excl) |
| 610 | { |
| 611 | struct btrfs_path *path; |
| 612 | struct btrfs_key key; |
| 613 | struct extent_buffer *l; |
| 614 | struct btrfs_qgroup_limit_item *qgroup_limit; |
| 615 | int ret; |
| 616 | int slot; |
| 617 | |
| 618 | key.objectid = 0; |
| 619 | key.type = BTRFS_QGROUP_LIMIT_KEY; |
| 620 | key.offset = qgroupid; |
| 621 | |
| 622 | path = btrfs_alloc_path(); |
Wang Shilong | 84cbe2f | 2013-02-27 11:20:56 +0000 | [diff] [blame] | 623 | if (!path) |
| 624 | return -ENOMEM; |
| 625 | |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 626 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 627 | if (ret > 0) |
| 628 | ret = -ENOENT; |
| 629 | |
| 630 | if (ret) |
| 631 | goto out; |
| 632 | |
| 633 | l = path->nodes[0]; |
| 634 | slot = path->slots[0]; |
| 635 | qgroup_limit = btrfs_item_ptr(l, path->slots[0], |
| 636 | struct btrfs_qgroup_limit_item); |
| 637 | btrfs_set_qgroup_limit_flags(l, qgroup_limit, flags); |
| 638 | btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, max_rfer); |
| 639 | btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, max_excl); |
| 640 | btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, rsv_rfer); |
| 641 | btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, rsv_excl); |
| 642 | |
| 643 | btrfs_mark_buffer_dirty(l); |
| 644 | |
| 645 | out: |
| 646 | btrfs_free_path(path); |
| 647 | return ret; |
| 648 | } |
| 649 | |
| 650 | static int update_qgroup_info_item(struct btrfs_trans_handle *trans, |
| 651 | struct btrfs_root *root, |
| 652 | struct btrfs_qgroup *qgroup) |
| 653 | { |
| 654 | struct btrfs_path *path; |
| 655 | struct btrfs_key key; |
| 656 | struct extent_buffer *l; |
| 657 | struct btrfs_qgroup_info_item *qgroup_info; |
| 658 | int ret; |
| 659 | int slot; |
| 660 | |
| 661 | key.objectid = 0; |
| 662 | key.type = BTRFS_QGROUP_INFO_KEY; |
| 663 | key.offset = qgroup->qgroupid; |
| 664 | |
| 665 | path = btrfs_alloc_path(); |
Wang Shilong | 84cbe2f | 2013-02-27 11:20:56 +0000 | [diff] [blame] | 666 | if (!path) |
| 667 | return -ENOMEM; |
| 668 | |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 669 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 670 | if (ret > 0) |
| 671 | ret = -ENOENT; |
| 672 | |
| 673 | if (ret) |
| 674 | goto out; |
| 675 | |
| 676 | l = path->nodes[0]; |
| 677 | slot = path->slots[0]; |
| 678 | qgroup_info = btrfs_item_ptr(l, path->slots[0], |
| 679 | struct btrfs_qgroup_info_item); |
| 680 | btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid); |
| 681 | btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer); |
| 682 | btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr); |
| 683 | btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl); |
| 684 | btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr); |
| 685 | |
| 686 | btrfs_mark_buffer_dirty(l); |
| 687 | |
| 688 | out: |
| 689 | btrfs_free_path(path); |
| 690 | return ret; |
| 691 | } |
| 692 | |
| 693 | static int update_qgroup_status_item(struct btrfs_trans_handle *trans, |
| 694 | struct btrfs_fs_info *fs_info, |
| 695 | struct btrfs_root *root) |
| 696 | { |
| 697 | struct btrfs_path *path; |
| 698 | struct btrfs_key key; |
| 699 | struct extent_buffer *l; |
| 700 | struct btrfs_qgroup_status_item *ptr; |
| 701 | int ret; |
| 702 | int slot; |
| 703 | |
| 704 | key.objectid = 0; |
| 705 | key.type = BTRFS_QGROUP_STATUS_KEY; |
| 706 | key.offset = 0; |
| 707 | |
| 708 | path = btrfs_alloc_path(); |
Wang Shilong | 84cbe2f | 2013-02-27 11:20:56 +0000 | [diff] [blame] | 709 | if (!path) |
| 710 | return -ENOMEM; |
| 711 | |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 712 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 713 | if (ret > 0) |
| 714 | ret = -ENOENT; |
| 715 | |
| 716 | if (ret) |
| 717 | goto out; |
| 718 | |
| 719 | l = path->nodes[0]; |
| 720 | slot = path->slots[0]; |
| 721 | ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item); |
| 722 | btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags); |
| 723 | btrfs_set_qgroup_status_generation(l, ptr, trans->transid); |
| 724 | /* XXX scan */ |
| 725 | |
| 726 | btrfs_mark_buffer_dirty(l); |
| 727 | |
| 728 | out: |
| 729 | btrfs_free_path(path); |
| 730 | return ret; |
| 731 | } |
| 732 | |
| 733 | /* |
| 734 | * called with qgroup_lock held |
| 735 | */ |
| 736 | static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans, |
| 737 | struct btrfs_root *root) |
| 738 | { |
| 739 | struct btrfs_path *path; |
| 740 | struct btrfs_key key; |
Wang Shilong | 06b3a86 | 2013-02-27 11:16:57 +0000 | [diff] [blame] | 741 | struct extent_buffer *leaf = NULL; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 742 | int ret; |
Wang Shilong | 06b3a86 | 2013-02-27 11:16:57 +0000 | [diff] [blame] | 743 | int nr = 0; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 744 | |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 745 | path = btrfs_alloc_path(); |
| 746 | if (!path) |
| 747 | return -ENOMEM; |
| 748 | |
Wang Shilong | 06b3a86 | 2013-02-27 11:16:57 +0000 | [diff] [blame] | 749 | path->leave_spinning = 1; |
| 750 | |
| 751 | key.objectid = 0; |
| 752 | key.offset = 0; |
| 753 | key.type = 0; |
| 754 | |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 755 | while (1) { |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 756 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Wang Shilong | 06b3a86 | 2013-02-27 11:16:57 +0000 | [diff] [blame] | 757 | if (ret < 0) |
| 758 | goto out; |
| 759 | leaf = path->nodes[0]; |
| 760 | nr = btrfs_header_nritems(leaf); |
| 761 | if (!nr) |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 762 | break; |
Wang Shilong | 06b3a86 | 2013-02-27 11:16:57 +0000 | [diff] [blame] | 763 | /* |
| 764 | * delete the leaf one by one |
| 765 | * since the whole tree is going |
| 766 | * to be deleted. |
| 767 | */ |
| 768 | path->slots[0] = 0; |
| 769 | ret = btrfs_del_items(trans, root, path, 0, nr); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 770 | if (ret) |
| 771 | goto out; |
Wang Shilong | 06b3a86 | 2013-02-27 11:16:57 +0000 | [diff] [blame] | 772 | |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 773 | btrfs_release_path(path); |
| 774 | } |
| 775 | ret = 0; |
| 776 | out: |
| 777 | root->fs_info->pending_quota_state = 0; |
| 778 | btrfs_free_path(path); |
| 779 | return ret; |
| 780 | } |
| 781 | |
| 782 | int btrfs_quota_enable(struct btrfs_trans_handle *trans, |
| 783 | struct btrfs_fs_info *fs_info) |
| 784 | { |
| 785 | struct btrfs_root *quota_root; |
| 786 | struct btrfs_path *path = NULL; |
| 787 | struct btrfs_qgroup_status_item *ptr; |
| 788 | struct extent_buffer *leaf; |
| 789 | struct btrfs_key key; |
| 790 | int ret = 0; |
| 791 | |
| 792 | spin_lock(&fs_info->qgroup_lock); |
| 793 | if (fs_info->quota_root) { |
| 794 | fs_info->pending_quota_state = 1; |
| 795 | spin_unlock(&fs_info->qgroup_lock); |
| 796 | goto out; |
| 797 | } |
| 798 | spin_unlock(&fs_info->qgroup_lock); |
| 799 | |
| 800 | /* |
| 801 | * initially create the quota tree |
| 802 | */ |
| 803 | quota_root = btrfs_create_tree(trans, fs_info, |
| 804 | BTRFS_QUOTA_TREE_OBJECTID); |
| 805 | if (IS_ERR(quota_root)) { |
| 806 | ret = PTR_ERR(quota_root); |
| 807 | goto out; |
| 808 | } |
| 809 | |
| 810 | path = btrfs_alloc_path(); |
Tsutomu Itoh | 5b7ff5b | 2012-10-16 05:44:21 +0000 | [diff] [blame] | 811 | if (!path) { |
| 812 | ret = -ENOMEM; |
| 813 | goto out_free_root; |
| 814 | } |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 815 | |
| 816 | key.objectid = 0; |
| 817 | key.type = BTRFS_QGROUP_STATUS_KEY; |
| 818 | key.offset = 0; |
| 819 | |
| 820 | ret = btrfs_insert_empty_item(trans, quota_root, path, &key, |
| 821 | sizeof(*ptr)); |
| 822 | if (ret) |
Tsutomu Itoh | 5b7ff5b | 2012-10-16 05:44:21 +0000 | [diff] [blame] | 823 | goto out_free_path; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 824 | |
| 825 | leaf = path->nodes[0]; |
| 826 | ptr = btrfs_item_ptr(leaf, path->slots[0], |
| 827 | struct btrfs_qgroup_status_item); |
| 828 | btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid); |
| 829 | btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION); |
| 830 | fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON | |
| 831 | BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; |
| 832 | btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags); |
| 833 | btrfs_set_qgroup_status_scan(leaf, ptr, 0); |
| 834 | |
| 835 | btrfs_mark_buffer_dirty(leaf); |
| 836 | |
| 837 | spin_lock(&fs_info->qgroup_lock); |
| 838 | fs_info->quota_root = quota_root; |
| 839 | fs_info->pending_quota_state = 1; |
| 840 | spin_unlock(&fs_info->qgroup_lock); |
Tsutomu Itoh | 5b7ff5b | 2012-10-16 05:44:21 +0000 | [diff] [blame] | 841 | out_free_path: |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 842 | btrfs_free_path(path); |
Tsutomu Itoh | 5b7ff5b | 2012-10-16 05:44:21 +0000 | [diff] [blame] | 843 | out_free_root: |
| 844 | if (ret) { |
| 845 | free_extent_buffer(quota_root->node); |
| 846 | free_extent_buffer(quota_root->commit_root); |
| 847 | kfree(quota_root); |
| 848 | } |
| 849 | out: |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 850 | return ret; |
| 851 | } |
| 852 | |
| 853 | int btrfs_quota_disable(struct btrfs_trans_handle *trans, |
| 854 | struct btrfs_fs_info *fs_info) |
| 855 | { |
| 856 | struct btrfs_root *tree_root = fs_info->tree_root; |
| 857 | struct btrfs_root *quota_root; |
| 858 | int ret = 0; |
| 859 | |
| 860 | spin_lock(&fs_info->qgroup_lock); |
Wang Shilong | 683cebd | 2013-02-20 14:16:14 +0000 | [diff] [blame] | 861 | if (!fs_info->quota_root) { |
| 862 | spin_unlock(&fs_info->qgroup_lock); |
| 863 | return 0; |
| 864 | } |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 865 | fs_info->quota_enabled = 0; |
| 866 | fs_info->pending_quota_state = 0; |
| 867 | quota_root = fs_info->quota_root; |
| 868 | fs_info->quota_root = NULL; |
| 869 | btrfs_free_qgroup_config(fs_info); |
| 870 | spin_unlock(&fs_info->qgroup_lock); |
| 871 | |
| 872 | if (!quota_root) |
| 873 | return -EINVAL; |
| 874 | |
| 875 | ret = btrfs_clean_quota_tree(trans, quota_root); |
| 876 | if (ret) |
| 877 | goto out; |
| 878 | |
| 879 | ret = btrfs_del_root(trans, tree_root, "a_root->root_key); |
| 880 | if (ret) |
| 881 | goto out; |
| 882 | |
| 883 | list_del("a_root->dirty_list); |
| 884 | |
| 885 | btrfs_tree_lock(quota_root->node); |
| 886 | clean_tree_block(trans, tree_root, quota_root->node); |
| 887 | btrfs_tree_unlock(quota_root->node); |
| 888 | btrfs_free_tree_block(trans, quota_root, quota_root->node, 0, 1); |
| 889 | |
| 890 | free_extent_buffer(quota_root->node); |
| 891 | free_extent_buffer(quota_root->commit_root); |
| 892 | kfree(quota_root); |
| 893 | out: |
| 894 | return ret; |
| 895 | } |
| 896 | |
| 897 | int btrfs_quota_rescan(struct btrfs_fs_info *fs_info) |
| 898 | { |
| 899 | /* FIXME */ |
| 900 | return 0; |
| 901 | } |
| 902 | |
| 903 | int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, |
| 904 | struct btrfs_fs_info *fs_info, u64 src, u64 dst) |
| 905 | { |
| 906 | struct btrfs_root *quota_root; |
| 907 | int ret = 0; |
| 908 | |
| 909 | quota_root = fs_info->quota_root; |
| 910 | if (!quota_root) |
| 911 | return -EINVAL; |
| 912 | |
| 913 | ret = add_qgroup_relation_item(trans, quota_root, src, dst); |
| 914 | if (ret) |
| 915 | return ret; |
| 916 | |
| 917 | ret = add_qgroup_relation_item(trans, quota_root, dst, src); |
| 918 | if (ret) { |
| 919 | del_qgroup_relation_item(trans, quota_root, src, dst); |
| 920 | return ret; |
| 921 | } |
| 922 | |
| 923 | spin_lock(&fs_info->qgroup_lock); |
| 924 | ret = add_relation_rb(quota_root->fs_info, src, dst); |
| 925 | spin_unlock(&fs_info->qgroup_lock); |
| 926 | |
| 927 | return ret; |
| 928 | } |
| 929 | |
| 930 | int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, |
| 931 | struct btrfs_fs_info *fs_info, u64 src, u64 dst) |
| 932 | { |
| 933 | struct btrfs_root *quota_root; |
| 934 | int ret = 0; |
| 935 | int err; |
| 936 | |
| 937 | quota_root = fs_info->quota_root; |
| 938 | if (!quota_root) |
| 939 | return -EINVAL; |
| 940 | |
| 941 | ret = del_qgroup_relation_item(trans, quota_root, src, dst); |
| 942 | err = del_qgroup_relation_item(trans, quota_root, dst, src); |
| 943 | if (err && !ret) |
| 944 | ret = err; |
| 945 | |
| 946 | spin_lock(&fs_info->qgroup_lock); |
| 947 | del_relation_rb(fs_info, src, dst); |
| 948 | |
| 949 | spin_unlock(&fs_info->qgroup_lock); |
| 950 | |
| 951 | return ret; |
| 952 | } |
| 953 | |
| 954 | int btrfs_create_qgroup(struct btrfs_trans_handle *trans, |
| 955 | struct btrfs_fs_info *fs_info, u64 qgroupid, char *name) |
| 956 | { |
| 957 | struct btrfs_root *quota_root; |
| 958 | struct btrfs_qgroup *qgroup; |
| 959 | int ret = 0; |
| 960 | |
| 961 | quota_root = fs_info->quota_root; |
| 962 | if (!quota_root) |
| 963 | return -EINVAL; |
| 964 | |
| 965 | ret = add_qgroup_item(trans, quota_root, qgroupid); |
| 966 | |
| 967 | spin_lock(&fs_info->qgroup_lock); |
| 968 | qgroup = add_qgroup_rb(fs_info, qgroupid); |
| 969 | spin_unlock(&fs_info->qgroup_lock); |
| 970 | |
| 971 | if (IS_ERR(qgroup)) |
| 972 | ret = PTR_ERR(qgroup); |
| 973 | |
| 974 | return ret; |
| 975 | } |
| 976 | |
| 977 | int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, |
| 978 | struct btrfs_fs_info *fs_info, u64 qgroupid) |
| 979 | { |
| 980 | struct btrfs_root *quota_root; |
Arne Jansen | 2cf6870 | 2013-01-17 01:22:09 -0700 | [diff] [blame] | 981 | struct btrfs_qgroup *qgroup; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 982 | int ret = 0; |
| 983 | |
| 984 | quota_root = fs_info->quota_root; |
| 985 | if (!quota_root) |
| 986 | return -EINVAL; |
| 987 | |
Arne Jansen | 2cf6870 | 2013-01-17 01:22:09 -0700 | [diff] [blame] | 988 | /* check if there are no relations to this qgroup */ |
| 989 | spin_lock(&fs_info->qgroup_lock); |
| 990 | qgroup = find_qgroup_rb(fs_info, qgroupid); |
| 991 | if (qgroup) { |
| 992 | if (!list_empty(&qgroup->groups) || !list_empty(&qgroup->members)) { |
| 993 | spin_unlock(&fs_info->qgroup_lock); |
| 994 | return -EBUSY; |
| 995 | } |
| 996 | } |
| 997 | spin_unlock(&fs_info->qgroup_lock); |
| 998 | |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 999 | ret = del_qgroup_item(trans, quota_root, qgroupid); |
| 1000 | |
| 1001 | spin_lock(&fs_info->qgroup_lock); |
| 1002 | del_qgroup_rb(quota_root->fs_info, qgroupid); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1003 | spin_unlock(&fs_info->qgroup_lock); |
| 1004 | |
| 1005 | return ret; |
| 1006 | } |
| 1007 | |
| 1008 | int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, |
| 1009 | struct btrfs_fs_info *fs_info, u64 qgroupid, |
| 1010 | struct btrfs_qgroup_limit *limit) |
| 1011 | { |
| 1012 | struct btrfs_root *quota_root = fs_info->quota_root; |
| 1013 | struct btrfs_qgroup *qgroup; |
| 1014 | int ret = 0; |
| 1015 | |
| 1016 | if (!quota_root) |
| 1017 | return -EINVAL; |
| 1018 | |
| 1019 | ret = update_qgroup_limit_item(trans, quota_root, qgroupid, |
| 1020 | limit->flags, limit->max_rfer, |
| 1021 | limit->max_excl, limit->rsv_rfer, |
| 1022 | limit->rsv_excl); |
| 1023 | if (ret) { |
| 1024 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; |
| 1025 | printk(KERN_INFO "unable to update quota limit for %llu\n", |
| 1026 | (unsigned long long)qgroupid); |
| 1027 | } |
| 1028 | |
| 1029 | spin_lock(&fs_info->qgroup_lock); |
| 1030 | |
| 1031 | qgroup = find_qgroup_rb(fs_info, qgroupid); |
| 1032 | if (!qgroup) { |
| 1033 | ret = -ENOENT; |
| 1034 | goto unlock; |
| 1035 | } |
| 1036 | qgroup->lim_flags = limit->flags; |
| 1037 | qgroup->max_rfer = limit->max_rfer; |
| 1038 | qgroup->max_excl = limit->max_excl; |
| 1039 | qgroup->rsv_rfer = limit->rsv_rfer; |
| 1040 | qgroup->rsv_excl = limit->rsv_excl; |
| 1041 | |
| 1042 | unlock: |
| 1043 | spin_unlock(&fs_info->qgroup_lock); |
| 1044 | |
| 1045 | return ret; |
| 1046 | } |
| 1047 | |
| 1048 | static void qgroup_dirty(struct btrfs_fs_info *fs_info, |
| 1049 | struct btrfs_qgroup *qgroup) |
| 1050 | { |
| 1051 | if (list_empty(&qgroup->dirty)) |
| 1052 | list_add(&qgroup->dirty, &fs_info->dirty_qgroups); |
| 1053 | } |
| 1054 | |
| 1055 | /* |
| 1056 | * btrfs_qgroup_record_ref is called when the ref is added or deleted. it puts |
| 1057 | * the modification into a list that's later used by btrfs_end_transaction to |
| 1058 | * pass the recorded modifications on to btrfs_qgroup_account_ref. |
| 1059 | */ |
| 1060 | int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans, |
| 1061 | struct btrfs_delayed_ref_node *node, |
| 1062 | struct btrfs_delayed_extent_op *extent_op) |
| 1063 | { |
| 1064 | struct qgroup_update *u; |
| 1065 | |
| 1066 | BUG_ON(!trans->delayed_ref_elem.seq); |
| 1067 | u = kmalloc(sizeof(*u), GFP_NOFS); |
| 1068 | if (!u) |
| 1069 | return -ENOMEM; |
| 1070 | |
| 1071 | u->node = node; |
| 1072 | u->extent_op = extent_op; |
| 1073 | list_add_tail(&u->list, &trans->qgroup_ref_list); |
| 1074 | |
| 1075 | return 0; |
| 1076 | } |
| 1077 | |
| 1078 | /* |
| 1079 | * btrfs_qgroup_account_ref is called for every ref that is added to or deleted |
| 1080 | * from the fs. First, all roots referencing the extent are searched, and |
| 1081 | * then the space is accounted accordingly to the different roots. The |
| 1082 | * accounting algorithm works in 3 steps documented inline. |
| 1083 | */ |
| 1084 | int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans, |
| 1085 | struct btrfs_fs_info *fs_info, |
| 1086 | struct btrfs_delayed_ref_node *node, |
| 1087 | struct btrfs_delayed_extent_op *extent_op) |
| 1088 | { |
| 1089 | struct btrfs_key ins; |
| 1090 | struct btrfs_root *quota_root; |
| 1091 | u64 ref_root; |
| 1092 | struct btrfs_qgroup *qgroup; |
| 1093 | struct ulist_node *unode; |
| 1094 | struct ulist *roots = NULL; |
| 1095 | struct ulist *tmp = NULL; |
| 1096 | struct ulist_iterator uiter; |
| 1097 | u64 seq; |
| 1098 | int ret = 0; |
| 1099 | int sgn; |
| 1100 | |
| 1101 | if (!fs_info->quota_enabled) |
| 1102 | return 0; |
| 1103 | |
| 1104 | BUG_ON(!fs_info->quota_root); |
| 1105 | |
| 1106 | ins.objectid = node->bytenr; |
| 1107 | ins.offset = node->num_bytes; |
| 1108 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
| 1109 | |
| 1110 | if (node->type == BTRFS_TREE_BLOCK_REF_KEY || |
| 1111 | node->type == BTRFS_SHARED_BLOCK_REF_KEY) { |
| 1112 | struct btrfs_delayed_tree_ref *ref; |
| 1113 | ref = btrfs_delayed_node_to_tree_ref(node); |
| 1114 | ref_root = ref->root; |
| 1115 | } else if (node->type == BTRFS_EXTENT_DATA_REF_KEY || |
| 1116 | node->type == BTRFS_SHARED_DATA_REF_KEY) { |
| 1117 | struct btrfs_delayed_data_ref *ref; |
| 1118 | ref = btrfs_delayed_node_to_data_ref(node); |
| 1119 | ref_root = ref->root; |
| 1120 | } else { |
| 1121 | BUG(); |
| 1122 | } |
| 1123 | |
| 1124 | if (!is_fstree(ref_root)) { |
| 1125 | /* |
| 1126 | * non-fs-trees are not being accounted |
| 1127 | */ |
| 1128 | return 0; |
| 1129 | } |
| 1130 | |
| 1131 | switch (node->action) { |
| 1132 | case BTRFS_ADD_DELAYED_REF: |
| 1133 | case BTRFS_ADD_DELAYED_EXTENT: |
| 1134 | sgn = 1; |
| 1135 | break; |
| 1136 | case BTRFS_DROP_DELAYED_REF: |
| 1137 | sgn = -1; |
| 1138 | break; |
| 1139 | case BTRFS_UPDATE_DELAYED_HEAD: |
| 1140 | return 0; |
| 1141 | default: |
| 1142 | BUG(); |
| 1143 | } |
| 1144 | |
| 1145 | /* |
| 1146 | * the delayed ref sequence number we pass depends on the direction of |
| 1147 | * the operation. for add operations, we pass (node->seq - 1) to skip |
| 1148 | * the delayed ref's current sequence number, because we need the state |
| 1149 | * of the tree before the add operation. for delete operations, we pass |
| 1150 | * (node->seq) to include the delayed ref's current sequence number, |
| 1151 | * because we need the state of the tree after the delete operation. |
| 1152 | */ |
| 1153 | ret = btrfs_find_all_roots(trans, fs_info, node->bytenr, |
| 1154 | sgn > 0 ? node->seq - 1 : node->seq, &roots); |
| 1155 | if (ret < 0) |
Wang Shilong | a797502 | 2013-03-25 11:08:23 +0000 | [diff] [blame] | 1156 | return ret; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1157 | |
| 1158 | spin_lock(&fs_info->qgroup_lock); |
| 1159 | quota_root = fs_info->quota_root; |
| 1160 | if (!quota_root) |
| 1161 | goto unlock; |
| 1162 | |
| 1163 | qgroup = find_qgroup_rb(fs_info, ref_root); |
| 1164 | if (!qgroup) |
| 1165 | goto unlock; |
| 1166 | |
| 1167 | /* |
| 1168 | * step 1: for each old ref, visit all nodes once and inc refcnt |
| 1169 | */ |
| 1170 | tmp = ulist_alloc(GFP_ATOMIC); |
| 1171 | if (!tmp) { |
| 1172 | ret = -ENOMEM; |
| 1173 | goto unlock; |
| 1174 | } |
| 1175 | seq = fs_info->qgroup_seq; |
| 1176 | fs_info->qgroup_seq += roots->nnodes + 1; /* max refcnt */ |
| 1177 | |
| 1178 | ULIST_ITER_INIT(&uiter); |
| 1179 | while ((unode = ulist_next(roots, &uiter))) { |
| 1180 | struct ulist_node *tmp_unode; |
| 1181 | struct ulist_iterator tmp_uiter; |
| 1182 | struct btrfs_qgroup *qg; |
| 1183 | |
| 1184 | qg = find_qgroup_rb(fs_info, unode->val); |
| 1185 | if (!qg) |
| 1186 | continue; |
| 1187 | |
| 1188 | ulist_reinit(tmp); |
| 1189 | /* XXX id not needed */ |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1190 | ulist_add(tmp, qg->qgroupid, (u64)(uintptr_t)qg, GFP_ATOMIC); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1191 | ULIST_ITER_INIT(&tmp_uiter); |
| 1192 | while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) { |
| 1193 | struct btrfs_qgroup_list *glist; |
| 1194 | |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1195 | qg = (struct btrfs_qgroup *)(uintptr_t)tmp_unode->aux; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1196 | if (qg->refcnt < seq) |
| 1197 | qg->refcnt = seq + 1; |
| 1198 | else |
| 1199 | ++qg->refcnt; |
| 1200 | |
| 1201 | list_for_each_entry(glist, &qg->groups, next_group) { |
| 1202 | ulist_add(tmp, glist->group->qgroupid, |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1203 | (u64)(uintptr_t)glist->group, |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1204 | GFP_ATOMIC); |
| 1205 | } |
| 1206 | } |
| 1207 | } |
| 1208 | |
| 1209 | /* |
| 1210 | * step 2: walk from the new root |
| 1211 | */ |
| 1212 | ulist_reinit(tmp); |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1213 | ulist_add(tmp, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1214 | ULIST_ITER_INIT(&uiter); |
| 1215 | while ((unode = ulist_next(tmp, &uiter))) { |
| 1216 | struct btrfs_qgroup *qg; |
| 1217 | struct btrfs_qgroup_list *glist; |
| 1218 | |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1219 | qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1220 | if (qg->refcnt < seq) { |
| 1221 | /* not visited by step 1 */ |
| 1222 | qg->rfer += sgn * node->num_bytes; |
| 1223 | qg->rfer_cmpr += sgn * node->num_bytes; |
| 1224 | if (roots->nnodes == 0) { |
| 1225 | qg->excl += sgn * node->num_bytes; |
| 1226 | qg->excl_cmpr += sgn * node->num_bytes; |
| 1227 | } |
| 1228 | qgroup_dirty(fs_info, qg); |
| 1229 | } |
| 1230 | WARN_ON(qg->tag >= seq); |
| 1231 | qg->tag = seq; |
| 1232 | |
| 1233 | list_for_each_entry(glist, &qg->groups, next_group) { |
| 1234 | ulist_add(tmp, glist->group->qgroupid, |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1235 | (uintptr_t)glist->group, GFP_ATOMIC); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1236 | } |
| 1237 | } |
| 1238 | |
| 1239 | /* |
| 1240 | * step 3: walk again from old refs |
| 1241 | */ |
| 1242 | ULIST_ITER_INIT(&uiter); |
| 1243 | while ((unode = ulist_next(roots, &uiter))) { |
| 1244 | struct btrfs_qgroup *qg; |
| 1245 | struct ulist_node *tmp_unode; |
| 1246 | struct ulist_iterator tmp_uiter; |
| 1247 | |
| 1248 | qg = find_qgroup_rb(fs_info, unode->val); |
| 1249 | if (!qg) |
| 1250 | continue; |
| 1251 | |
| 1252 | ulist_reinit(tmp); |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1253 | ulist_add(tmp, qg->qgroupid, (uintptr_t)qg, GFP_ATOMIC); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1254 | ULIST_ITER_INIT(&tmp_uiter); |
| 1255 | while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) { |
| 1256 | struct btrfs_qgroup_list *glist; |
| 1257 | |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1258 | qg = (struct btrfs_qgroup *)(uintptr_t)tmp_unode->aux; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1259 | if (qg->tag == seq) |
| 1260 | continue; |
| 1261 | |
| 1262 | if (qg->refcnt - seq == roots->nnodes) { |
| 1263 | qg->excl -= sgn * node->num_bytes; |
| 1264 | qg->excl_cmpr -= sgn * node->num_bytes; |
| 1265 | qgroup_dirty(fs_info, qg); |
| 1266 | } |
| 1267 | |
| 1268 | list_for_each_entry(glist, &qg->groups, next_group) { |
| 1269 | ulist_add(tmp, glist->group->qgroupid, |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1270 | (uintptr_t)glist->group, |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1271 | GFP_ATOMIC); |
| 1272 | } |
| 1273 | } |
| 1274 | } |
| 1275 | ret = 0; |
| 1276 | unlock: |
| 1277 | spin_unlock(&fs_info->qgroup_lock); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1278 | ulist_free(roots); |
| 1279 | ulist_free(tmp); |
| 1280 | |
| 1281 | return ret; |
| 1282 | } |
| 1283 | |
| 1284 | /* |
| 1285 | * called from commit_transaction. Writes all changed qgroups to disk. |
| 1286 | */ |
| 1287 | int btrfs_run_qgroups(struct btrfs_trans_handle *trans, |
| 1288 | struct btrfs_fs_info *fs_info) |
| 1289 | { |
| 1290 | struct btrfs_root *quota_root = fs_info->quota_root; |
| 1291 | int ret = 0; |
| 1292 | |
| 1293 | if (!quota_root) |
| 1294 | goto out; |
| 1295 | |
| 1296 | fs_info->quota_enabled = fs_info->pending_quota_state; |
| 1297 | |
| 1298 | spin_lock(&fs_info->qgroup_lock); |
| 1299 | while (!list_empty(&fs_info->dirty_qgroups)) { |
| 1300 | struct btrfs_qgroup *qgroup; |
| 1301 | qgroup = list_first_entry(&fs_info->dirty_qgroups, |
| 1302 | struct btrfs_qgroup, dirty); |
| 1303 | list_del_init(&qgroup->dirty); |
| 1304 | spin_unlock(&fs_info->qgroup_lock); |
| 1305 | ret = update_qgroup_info_item(trans, quota_root, qgroup); |
| 1306 | if (ret) |
| 1307 | fs_info->qgroup_flags |= |
| 1308 | BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; |
| 1309 | spin_lock(&fs_info->qgroup_lock); |
| 1310 | } |
| 1311 | if (fs_info->quota_enabled) |
| 1312 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON; |
| 1313 | else |
| 1314 | fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON; |
| 1315 | spin_unlock(&fs_info->qgroup_lock); |
| 1316 | |
| 1317 | ret = update_qgroup_status_item(trans, fs_info, quota_root); |
| 1318 | if (ret) |
| 1319 | fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT; |
| 1320 | |
| 1321 | out: |
| 1322 | |
| 1323 | return ret; |
| 1324 | } |
| 1325 | |
| 1326 | /* |
| 1327 | * copy the acounting information between qgroups. This is necessary when a |
| 1328 | * snapshot or a subvolume is created |
| 1329 | */ |
| 1330 | int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, |
| 1331 | struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid, |
| 1332 | struct btrfs_qgroup_inherit *inherit) |
| 1333 | { |
| 1334 | int ret = 0; |
| 1335 | int i; |
| 1336 | u64 *i_qgroups; |
| 1337 | struct btrfs_root *quota_root = fs_info->quota_root; |
| 1338 | struct btrfs_qgroup *srcgroup; |
| 1339 | struct btrfs_qgroup *dstgroup; |
| 1340 | u32 level_size = 0; |
| 1341 | |
| 1342 | if (!fs_info->quota_enabled) |
| 1343 | return 0; |
| 1344 | |
| 1345 | if (!quota_root) |
| 1346 | return -EINVAL; |
| 1347 | |
| 1348 | /* |
| 1349 | * create a tracking group for the subvol itself |
| 1350 | */ |
| 1351 | ret = add_qgroup_item(trans, quota_root, objectid); |
| 1352 | if (ret) |
| 1353 | goto out; |
| 1354 | |
| 1355 | if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) { |
| 1356 | ret = update_qgroup_limit_item(trans, quota_root, objectid, |
| 1357 | inherit->lim.flags, |
| 1358 | inherit->lim.max_rfer, |
| 1359 | inherit->lim.max_excl, |
| 1360 | inherit->lim.rsv_rfer, |
| 1361 | inherit->lim.rsv_excl); |
| 1362 | if (ret) |
| 1363 | goto out; |
| 1364 | } |
| 1365 | |
| 1366 | if (srcid) { |
| 1367 | struct btrfs_root *srcroot; |
| 1368 | struct btrfs_key srckey; |
| 1369 | int srcroot_level; |
| 1370 | |
| 1371 | srckey.objectid = srcid; |
| 1372 | srckey.type = BTRFS_ROOT_ITEM_KEY; |
| 1373 | srckey.offset = (u64)-1; |
| 1374 | srcroot = btrfs_read_fs_root_no_name(fs_info, &srckey); |
| 1375 | if (IS_ERR(srcroot)) { |
| 1376 | ret = PTR_ERR(srcroot); |
| 1377 | goto out; |
| 1378 | } |
| 1379 | |
| 1380 | rcu_read_lock(); |
| 1381 | srcroot_level = btrfs_header_level(srcroot->node); |
| 1382 | level_size = btrfs_level_size(srcroot, srcroot_level); |
| 1383 | rcu_read_unlock(); |
| 1384 | } |
| 1385 | |
| 1386 | /* |
| 1387 | * add qgroup to all inherited groups |
| 1388 | */ |
| 1389 | if (inherit) { |
| 1390 | i_qgroups = (u64 *)(inherit + 1); |
| 1391 | for (i = 0; i < inherit->num_qgroups; ++i) { |
| 1392 | ret = add_qgroup_relation_item(trans, quota_root, |
| 1393 | objectid, *i_qgroups); |
| 1394 | if (ret) |
| 1395 | goto out; |
| 1396 | ret = add_qgroup_relation_item(trans, quota_root, |
| 1397 | *i_qgroups, objectid); |
| 1398 | if (ret) |
| 1399 | goto out; |
| 1400 | ++i_qgroups; |
| 1401 | } |
| 1402 | } |
| 1403 | |
| 1404 | |
| 1405 | spin_lock(&fs_info->qgroup_lock); |
| 1406 | |
| 1407 | dstgroup = add_qgroup_rb(fs_info, objectid); |
Dan Carpenter | 57a5a88 | 2012-07-30 02:15:43 -0600 | [diff] [blame] | 1408 | if (IS_ERR(dstgroup)) { |
| 1409 | ret = PTR_ERR(dstgroup); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1410 | goto unlock; |
Dan Carpenter | 57a5a88 | 2012-07-30 02:15:43 -0600 | [diff] [blame] | 1411 | } |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1412 | |
| 1413 | if (srcid) { |
| 1414 | srcgroup = find_qgroup_rb(fs_info, srcid); |
Chris Mason | f3a87f1 | 2012-09-14 20:06:30 -0400 | [diff] [blame] | 1415 | if (!srcgroup) |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1416 | goto unlock; |
| 1417 | dstgroup->rfer = srcgroup->rfer - level_size; |
| 1418 | dstgroup->rfer_cmpr = srcgroup->rfer_cmpr - level_size; |
| 1419 | srcgroup->excl = level_size; |
| 1420 | srcgroup->excl_cmpr = level_size; |
| 1421 | qgroup_dirty(fs_info, dstgroup); |
| 1422 | qgroup_dirty(fs_info, srcgroup); |
| 1423 | } |
| 1424 | |
Chris Mason | f3a87f1 | 2012-09-14 20:06:30 -0400 | [diff] [blame] | 1425 | if (!inherit) |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1426 | goto unlock; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1427 | |
| 1428 | i_qgroups = (u64 *)(inherit + 1); |
| 1429 | for (i = 0; i < inherit->num_qgroups; ++i) { |
| 1430 | ret = add_relation_rb(quota_root->fs_info, objectid, |
| 1431 | *i_qgroups); |
| 1432 | if (ret) |
| 1433 | goto unlock; |
| 1434 | ++i_qgroups; |
| 1435 | } |
| 1436 | |
| 1437 | for (i = 0; i < inherit->num_ref_copies; ++i) { |
| 1438 | struct btrfs_qgroup *src; |
| 1439 | struct btrfs_qgroup *dst; |
| 1440 | |
| 1441 | src = find_qgroup_rb(fs_info, i_qgroups[0]); |
| 1442 | dst = find_qgroup_rb(fs_info, i_qgroups[1]); |
| 1443 | |
| 1444 | if (!src || !dst) { |
| 1445 | ret = -EINVAL; |
| 1446 | goto unlock; |
| 1447 | } |
| 1448 | |
| 1449 | dst->rfer = src->rfer - level_size; |
| 1450 | dst->rfer_cmpr = src->rfer_cmpr - level_size; |
| 1451 | i_qgroups += 2; |
| 1452 | } |
| 1453 | for (i = 0; i < inherit->num_excl_copies; ++i) { |
| 1454 | struct btrfs_qgroup *src; |
| 1455 | struct btrfs_qgroup *dst; |
| 1456 | |
| 1457 | src = find_qgroup_rb(fs_info, i_qgroups[0]); |
| 1458 | dst = find_qgroup_rb(fs_info, i_qgroups[1]); |
| 1459 | |
| 1460 | if (!src || !dst) { |
| 1461 | ret = -EINVAL; |
| 1462 | goto unlock; |
| 1463 | } |
| 1464 | |
| 1465 | dst->excl = src->excl + level_size; |
| 1466 | dst->excl_cmpr = src->excl_cmpr + level_size; |
| 1467 | i_qgroups += 2; |
| 1468 | } |
| 1469 | |
| 1470 | unlock: |
| 1471 | spin_unlock(&fs_info->qgroup_lock); |
| 1472 | out: |
| 1473 | return ret; |
| 1474 | } |
| 1475 | |
| 1476 | /* |
| 1477 | * reserve some space for a qgroup and all its parents. The reservation takes |
| 1478 | * place with start_transaction or dealloc_reserve, similar to ENOSPC |
| 1479 | * accounting. If not enough space is available, EDQUOT is returned. |
| 1480 | * We assume that the requested space is new for all qgroups. |
| 1481 | */ |
| 1482 | int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes) |
| 1483 | { |
| 1484 | struct btrfs_root *quota_root; |
| 1485 | struct btrfs_qgroup *qgroup; |
| 1486 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1487 | u64 ref_root = root->root_key.objectid; |
| 1488 | int ret = 0; |
| 1489 | struct ulist *ulist = NULL; |
| 1490 | struct ulist_node *unode; |
| 1491 | struct ulist_iterator uiter; |
| 1492 | |
| 1493 | if (!is_fstree(ref_root)) |
| 1494 | return 0; |
| 1495 | |
| 1496 | if (num_bytes == 0) |
| 1497 | return 0; |
| 1498 | |
| 1499 | spin_lock(&fs_info->qgroup_lock); |
| 1500 | quota_root = fs_info->quota_root; |
| 1501 | if (!quota_root) |
| 1502 | goto out; |
| 1503 | |
| 1504 | qgroup = find_qgroup_rb(fs_info, ref_root); |
| 1505 | if (!qgroup) |
| 1506 | goto out; |
| 1507 | |
| 1508 | /* |
| 1509 | * in a first step, we check all affected qgroups if any limits would |
| 1510 | * be exceeded |
| 1511 | */ |
| 1512 | ulist = ulist_alloc(GFP_ATOMIC); |
Tsutomu Itoh | 3d6b5c3 | 2012-09-06 00:18:10 -0600 | [diff] [blame] | 1513 | if (!ulist) { |
| 1514 | ret = -ENOMEM; |
| 1515 | goto out; |
| 1516 | } |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1517 | ulist_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1518 | ULIST_ITER_INIT(&uiter); |
| 1519 | while ((unode = ulist_next(ulist, &uiter))) { |
| 1520 | struct btrfs_qgroup *qg; |
| 1521 | struct btrfs_qgroup_list *glist; |
| 1522 | |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1523 | qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1524 | |
| 1525 | if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) && |
| 1526 | qg->reserved + qg->rfer + num_bytes > |
Wang Shilong | 720f1e2 | 2013-03-06 11:51:47 +0000 | [diff] [blame] | 1527 | qg->max_rfer) { |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1528 | ret = -EDQUOT; |
Wang Shilong | 720f1e2 | 2013-03-06 11:51:47 +0000 | [diff] [blame] | 1529 | goto out; |
| 1530 | } |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1531 | |
| 1532 | if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) && |
| 1533 | qg->reserved + qg->excl + num_bytes > |
Wang Shilong | 720f1e2 | 2013-03-06 11:51:47 +0000 | [diff] [blame] | 1534 | qg->max_excl) { |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1535 | ret = -EDQUOT; |
Wang Shilong | 720f1e2 | 2013-03-06 11:51:47 +0000 | [diff] [blame] | 1536 | goto out; |
| 1537 | } |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1538 | |
| 1539 | list_for_each_entry(glist, &qg->groups, next_group) { |
| 1540 | ulist_add(ulist, glist->group->qgroupid, |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1541 | (uintptr_t)glist->group, GFP_ATOMIC); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1542 | } |
| 1543 | } |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1544 | |
| 1545 | /* |
| 1546 | * no limits exceeded, now record the reservation into all qgroups |
| 1547 | */ |
| 1548 | ULIST_ITER_INIT(&uiter); |
| 1549 | while ((unode = ulist_next(ulist, &uiter))) { |
| 1550 | struct btrfs_qgroup *qg; |
| 1551 | |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1552 | qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1553 | |
| 1554 | qg->reserved += num_bytes; |
| 1555 | } |
| 1556 | |
| 1557 | out: |
| 1558 | spin_unlock(&fs_info->qgroup_lock); |
| 1559 | ulist_free(ulist); |
| 1560 | |
| 1561 | return ret; |
| 1562 | } |
| 1563 | |
| 1564 | void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes) |
| 1565 | { |
| 1566 | struct btrfs_root *quota_root; |
| 1567 | struct btrfs_qgroup *qgroup; |
| 1568 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1569 | struct ulist *ulist = NULL; |
| 1570 | struct ulist_node *unode; |
| 1571 | struct ulist_iterator uiter; |
| 1572 | u64 ref_root = root->root_key.objectid; |
| 1573 | |
| 1574 | if (!is_fstree(ref_root)) |
| 1575 | return; |
| 1576 | |
| 1577 | if (num_bytes == 0) |
| 1578 | return; |
| 1579 | |
| 1580 | spin_lock(&fs_info->qgroup_lock); |
| 1581 | |
| 1582 | quota_root = fs_info->quota_root; |
| 1583 | if (!quota_root) |
| 1584 | goto out; |
| 1585 | |
| 1586 | qgroup = find_qgroup_rb(fs_info, ref_root); |
| 1587 | if (!qgroup) |
| 1588 | goto out; |
| 1589 | |
| 1590 | ulist = ulist_alloc(GFP_ATOMIC); |
Tsutomu Itoh | 3d6b5c3 | 2012-09-06 00:18:10 -0600 | [diff] [blame] | 1591 | if (!ulist) { |
| 1592 | btrfs_std_error(fs_info, -ENOMEM); |
| 1593 | goto out; |
| 1594 | } |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1595 | ulist_add(ulist, qgroup->qgroupid, (uintptr_t)qgroup, GFP_ATOMIC); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1596 | ULIST_ITER_INIT(&uiter); |
| 1597 | while ((unode = ulist_next(ulist, &uiter))) { |
| 1598 | struct btrfs_qgroup *qg; |
| 1599 | struct btrfs_qgroup_list *glist; |
| 1600 | |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1601 | qg = (struct btrfs_qgroup *)(uintptr_t)unode->aux; |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1602 | |
| 1603 | qg->reserved -= num_bytes; |
| 1604 | |
| 1605 | list_for_each_entry(glist, &qg->groups, next_group) { |
| 1606 | ulist_add(ulist, glist->group->qgroupid, |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 1607 | (uintptr_t)glist->group, GFP_ATOMIC); |
Arne Jansen | bed92ea | 2012-06-28 18:03:02 +0200 | [diff] [blame] | 1608 | } |
| 1609 | } |
| 1610 | |
| 1611 | out: |
| 1612 | spin_unlock(&fs_info->qgroup_lock); |
| 1613 | ulist_free(ulist); |
| 1614 | } |
| 1615 | |
| 1616 | void assert_qgroups_uptodate(struct btrfs_trans_handle *trans) |
| 1617 | { |
| 1618 | if (list_empty(&trans->qgroup_ref_list) && !trans->delayed_ref_elem.seq) |
| 1619 | return; |
| 1620 | printk(KERN_ERR "btrfs: qgroups not uptodate in trans handle %p: list is%s empty, seq is %llu\n", |
| 1621 | trans, list_empty(&trans->qgroup_ref_list) ? "" : " not", |
| 1622 | trans->delayed_ref_elem.seq); |
| 1623 | BUG(); |
| 1624 | } |