kernel/fs/btrfs/tests/qgroup-tests.c

   1 /*
   2  * Copyright (C) 2013 Facebook.  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 "btrfs-tests.h"
  20 #include "../ctree.h"
  21 #include "../transaction.h"
  22 #include "../disk-io.h"
  23 #include "../qgroup.h"
  24
  25 static void init_dummy_trans(struct btrfs_trans_handle *trans)
  26 {
  27         memset(trans, 0, sizeof(*trans));
  28         trans->transid = 1;
  29         INIT_LIST_HEAD(&trans->qgroup_ref_list);
  30         trans->type = __TRANS_DUMMY;
  31 }
  32
  33 static int insert_normal_tree_ref(struct btrfs_root *root, u64 bytenr,
  34                                   u64 num_bytes, u64 parent, u64 root_objectid)
  35 {
  36         struct btrfs_trans_handle trans;
  37         struct btrfs_extent_item *item;
  38         struct btrfs_extent_inline_ref *iref;
  39         struct btrfs_tree_block_info *block_info;
  40         struct btrfs_path *path;
  41         struct extent_buffer *leaf;
  42         struct btrfs_key ins;
  43         u32 size = sizeof(*item) + sizeof(*iref) + sizeof(*block_info);
  44         int ret;
  45
  46         init_dummy_trans(&trans);
  47
  48         ins.objectid = bytenr;
  49         ins.type = BTRFS_EXTENT_ITEM_KEY;
  50         ins.offset = num_bytes;
  51
  52         path = btrfs_alloc_path();
  53         if (!path) {
  54                 test_msg("Couldn't allocate path\n");
  55                 return -ENOMEM;
  56         }
  57
  58         path->leave_spinning = 1;
  59         ret = btrfs_insert_empty_item(&trans, root, path, &ins, size);
  60         if (ret) {
  61                 test_msg("Couldn't insert ref %d\n", ret);
  62                 btrfs_free_path(path);
  63                 return ret;
  64         }
  65
  66         leaf = path->nodes[0];
  67         item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
  68         btrfs_set_extent_refs(leaf, item, 1);
  69         btrfs_set_extent_generation(leaf, item, 1);
  70         btrfs_set_extent_flags(leaf, item, BTRFS_EXTENT_FLAG_TREE_BLOCK);
  71         block_info = (struct btrfs_tree_block_info *)(item + 1);
  72         btrfs_set_tree_block_level(leaf, block_info, 1);
  73         iref = (struct btrfs_extent_inline_ref *)(block_info + 1);
  74         if (parent > 0) {
  75                 btrfs_set_extent_inline_ref_type(leaf, iref,
  76                                                  BTRFS_SHARED_BLOCK_REF_KEY);
  77                 btrfs_set_extent_inline_ref_offset(leaf, iref, parent);
  78         } else {
  79                 btrfs_set_extent_inline_ref_type(leaf, iref, BTRFS_TREE_BLOCK_REF_KEY);
  80                 btrfs_set_extent_inline_ref_offset(leaf, iref, root_objectid);
  81         }
  82         btrfs_free_path(path);
  83         return 0;
  84 }
  85
  86 static int add_tree_ref(struct btrfs_root *root, u64 bytenr, u64 num_bytes,
  87                         u64 parent, u64 root_objectid)
  88 {
  89         struct btrfs_trans_handle trans;
  90         struct btrfs_extent_item *item;
  91         struct btrfs_path *path;
  92         struct btrfs_key key;
  93         u64 refs;
  94         int ret;
  95
  96         init_dummy_trans(&trans);
  97
  98         key.objectid = bytenr;
  99         key.type = BTRFS_EXTENT_ITEM_KEY;
 100         key.offset = num_bytes;
 101
 102         path = btrfs_alloc_path();
 103         if (!path) {
 104                 test_msg("Couldn't allocate path\n");
 105                 return -ENOMEM;
 106         }
 107
 108         path->leave_spinning = 1;
 109         ret = btrfs_search_slot(&trans, root, &key, path, 0, 1);
 110         if (ret) {
 111                 test_msg("Couldn't find extent ref\n");
 112                 btrfs_free_path(path);
 113                 return ret;
 114         }
 115
 116         item = btrfs_item_ptr(path->nodes[0], path->slots[0],
 117                               struct btrfs_extent_item);
 118         refs = btrfs_extent_refs(path->nodes[0], item);
 119         btrfs_set_extent_refs(path->nodes[0], item, refs + 1);
 120         btrfs_release_path(path);
 121
 122         key.objectid = bytenr;
 123         if (parent) {
 124                 key.type = BTRFS_SHARED_BLOCK_REF_KEY;
 125                 key.offset = parent;
 126         } else {
 127                 key.type = BTRFS_TREE_BLOCK_REF_KEY;
 128                 key.offset = root_objectid;
 129         }
 130
 131         ret = btrfs_insert_empty_item(&trans, root, path, &key, 0);
 132         if (ret)
 133                 test_msg("Failed to insert backref\n");
 134         btrfs_free_path(path);
 135         return ret;
 136 }
 137
 138 static int remove_extent_item(struct btrfs_root *root, u64 bytenr,
 139                               u64 num_bytes)
 140 {
 141         struct btrfs_trans_handle trans;
 142         struct btrfs_key key;
 143         struct btrfs_path *path;
 144         int ret;
 145
 146         init_dummy_trans(&trans);
 147
 148         key.objectid = bytenr;
 149         key.type = BTRFS_EXTENT_ITEM_KEY;
 150         key.offset = num_bytes;
 151
 152         path = btrfs_alloc_path();
 153         if (!path) {
 154                 test_msg("Couldn't allocate path\n");
 155                 return -ENOMEM;
 156         }
 157         path->leave_spinning = 1;
 158
 159         ret = btrfs_search_slot(&trans, root, &key, path, -1, 1);
 160         if (ret) {
 161                 test_msg("Didn't find our key %d\n", ret);
 162                 btrfs_free_path(path);
 163                 return ret;
 164         }
 165         btrfs_del_item(&trans, root, path);
 166         btrfs_free_path(path);
 167         return 0;
 168 }
 169
 170 static int remove_extent_ref(struct btrfs_root *root, u64 bytenr,
 171                              u64 num_bytes, u64 parent, u64 root_objectid)
 172 {
 173         struct btrfs_trans_handle trans;
 174         struct btrfs_extent_item *item;
 175         struct btrfs_path *path;
 176         struct btrfs_key key;
 177         u64 refs;
 178         int ret;
 179
 180         init_dummy_trans(&trans);
 181
 182         key.objectid = bytenr;
 183         key.type = BTRFS_EXTENT_ITEM_KEY;
 184         key.offset = num_bytes;
 185
 186         path = btrfs_alloc_path();
 187         if (!path) {
 188                 test_msg("Couldn't allocate path\n");
 189                 return -ENOMEM;
 190         }
 191
 192         path->leave_spinning = 1;
 193         ret = btrfs_search_slot(&trans, root, &key, path, 0, 1);
 194         if (ret) {
 195                 test_msg("Couldn't find extent ref\n");
 196                 btrfs_free_path(path);
 197                 return ret;
 198         }
 199
 200         item = btrfs_item_ptr(path->nodes[0], path->slots[0],
 201                               struct btrfs_extent_item);
 202         refs = btrfs_extent_refs(path->nodes[0], item);
 203         btrfs_set_extent_refs(path->nodes[0], item, refs - 1);
 204         btrfs_release_path(path);
 205
 206         key.objectid = bytenr;
 207         if (parent) {
 208                 key.type = BTRFS_SHARED_BLOCK_REF_KEY;
 209                 key.offset = parent;
 210         } else {
 211                 key.type = BTRFS_TREE_BLOCK_REF_KEY;
 212                 key.offset = root_objectid;
 213         }
 214
 215         ret = btrfs_search_slot(&trans, root, &key, path, -1, 1);
 216         if (ret) {
 217                 test_msg("Couldn't find backref %d\n", ret);
 218                 btrfs_free_path(path);
 219                 return ret;
 220         }
 221         btrfs_del_item(&trans, root, path);
 222         btrfs_free_path(path);
 223         return ret;
 224 }
 225
 226 static int test_no_shared_qgroup(struct btrfs_root *root)
 227 {
 228         struct btrfs_trans_handle trans;
 229         struct btrfs_fs_info *fs_info = root->fs_info;
 230         int ret;
 231
 232         init_dummy_trans(&trans);
 233
 234         test_msg("Qgroup basic add\n");
 235         ret = btrfs_create_qgroup(NULL, fs_info, 5);
 236         if (ret) {
 237                 test_msg("Couldn't create a qgroup %d\n", ret);
 238                 return ret;
 239         }
 240
 241         ret = btrfs_qgroup_record_ref(&trans, fs_info, 5, 4096, 4096,
 242                                       BTRFS_QGROUP_OPER_ADD_EXCL, 0);
 243         if (ret) {
 244                 test_msg("Couldn't add space to a qgroup %d\n", ret);
 245                 return ret;
 246         }
 247
 248         ret = insert_normal_tree_ref(root, 4096, 4096, 0, 5);
 249         if (ret)
 250                 return ret;
 251
 252         ret = btrfs_delayed_qgroup_accounting(&trans, fs_info);
 253         if (ret) {
 254                 test_msg("Delayed qgroup accounting failed %d\n", ret);
 255                 return ret;
 256         }
 257
 258         if (btrfs_verify_qgroup_counts(fs_info, 5, 4096, 4096)) {
 259                 test_msg("Qgroup counts didn't match expected values\n");
 260                 return -EINVAL;
 261         }
 262
 263         ret = remove_extent_item(root, 4096, 4096);
 264         if (ret)
 265                 return -EINVAL;
 266
 267         ret = btrfs_qgroup_record_ref(&trans, fs_info, 5, 4096, 4096,
 268                                       BTRFS_QGROUP_OPER_SUB_EXCL, 0);
 269         if (ret) {
 270                 test_msg("Couldn't remove space from the qgroup %d\n", ret);
 271                 return -EINVAL;
 272         }
 273
 274         ret = btrfs_delayed_qgroup_accounting(&trans, fs_info);
 275         if (ret) {
 276                 test_msg("Qgroup accounting failed %d\n", ret);
 277                 return -EINVAL;
 278         }
 279
 280         if (btrfs_verify_qgroup_counts(fs_info, 5, 0, 0)) {
 281                 test_msg("Qgroup counts didn't match expected values\n");
 282                 return -EINVAL;
 283         }
 284
 285         return 0;
 286 }
 287
 288 /*
 289  * Add a ref for two different roots to make sure the shared value comes out
 290  * right, also remove one of the roots and make sure the exclusive count is
 291  * adjusted properly.
 292  */
 293 static int test_multiple_refs(struct btrfs_root *root)
 294 {
 295         struct btrfs_trans_handle trans;
 296         struct btrfs_fs_info *fs_info = root->fs_info;
 297         int ret;
 298
 299         init_dummy_trans(&trans);
 300
 301         test_msg("Qgroup multiple refs test\n");
 302
 303         /* We have 5 created already from the previous test */
 304         ret = btrfs_create_qgroup(NULL, fs_info, 256);
 305         if (ret) {
 306                 test_msg("Couldn't create a qgroup %d\n", ret);
 307                 return ret;
 308         }
 309
 310         ret = insert_normal_tree_ref(root, 4096, 4096, 0, 5);
 311         if (ret)
 312                 return ret;
 313
 314         ret = btrfs_qgroup_record_ref(&trans, fs_info, 5, 4096, 4096,
 315                                       BTRFS_QGROUP_OPER_ADD_EXCL, 0);
 316         if (ret) {
 317                 test_msg("Couldn't add space to a qgroup %d\n", ret);
 318                 return ret;
 319         }
 320
 321         ret = btrfs_delayed_qgroup_accounting(&trans, fs_info);
 322         if (ret) {
 323                 test_msg("Delayed qgroup accounting failed %d\n", ret);
 324                 return ret;
 325         }
 326
 327         if (btrfs_verify_qgroup_counts(fs_info, 5, 4096, 4096)) {
 328                 test_msg("Qgroup counts didn't match expected values\n");
 329                 return -EINVAL;
 330         }
 331
 332         ret = add_tree_ref(root, 4096, 4096, 0, 256);
 333         if (ret)
 334                 return ret;
 335
 336         ret = btrfs_qgroup_record_ref(&trans, fs_info, 256, 4096, 4096,
 337                                       BTRFS_QGROUP_OPER_ADD_SHARED, 0);
 338         if (ret) {
 339                 test_msg("Qgroup record ref failed %d\n", ret);
 340                 return ret;
 341         }
 342
 343         ret = btrfs_delayed_qgroup_accounting(&trans, fs_info);
 344         if (ret) {
 345                 test_msg("Qgroup accounting failed %d\n", ret);
 346                 return ret;
 347         }
 348
 349         if (btrfs_verify_qgroup_counts(fs_info, 5, 4096, 0)) {
 350                 test_msg("Qgroup counts didn't match expected values\n");
 351                 return -EINVAL;
 352         }
 353
 354         if (btrfs_verify_qgroup_counts(fs_info, 256, 4096, 0)) {
 355                 test_msg("Qgroup counts didn't match expected values\n");
 356                 return -EINVAL;
 357         }
 358
 359         ret = remove_extent_ref(root, 4096, 4096, 0, 256);
 360         if (ret)
 361                 return ret;
 362
 363         ret = btrfs_qgroup_record_ref(&trans, fs_info, 256, 4096, 4096,
 364                                       BTRFS_QGROUP_OPER_SUB_SHARED, 0);
 365         if (ret) {
 366                 test_msg("Qgroup record ref failed %d\n", ret);
 367                 return ret;
 368         }
 369
 370         ret = btrfs_delayed_qgroup_accounting(&trans, fs_info);
 371         if (ret) {
 372                 test_msg("Qgroup accounting failed %d\n", ret);
 373                 return ret;
 374         }
 375
 376         if (btrfs_verify_qgroup_counts(fs_info, 256, 0, 0)) {
 377                 test_msg("Qgroup counts didn't match expected values\n");
 378                 return -EINVAL;
 379         }
 380
 381         if (btrfs_verify_qgroup_counts(fs_info, 5, 4096, 4096)) {
 382                 test_msg("Qgroup counts didn't match expected values\n");
 383                 return -EINVAL;
 384         }
 385
 386         return 0;
 387 }
 388
 389 int btrfs_test_qgroups(void)
 390 {
 391         struct btrfs_root *root;
 392         struct btrfs_root *tmp_root;
 393         int ret = 0;
 394
 395         root = btrfs_alloc_dummy_root();
 396         if (IS_ERR(root)) {
 397                 test_msg("Couldn't allocate root\n");
 398                 return PTR_ERR(root);
 399         }
 400
 401         root->fs_info = btrfs_alloc_dummy_fs_info();
 402         if (!root->fs_info) {
 403                 test_msg("Couldn't allocate dummy fs info\n");
 404                 ret = -ENOMEM;
 405                 goto out;
 406         }
 407         /* We are using this root as our extent root */
 408         root->fs_info->extent_root = root;
 409
 410         /*
 411          * Some of the paths we test assume we have a filled out fs_info, so we
 412          * just need to add the root in there so we don't panic.
 413          */
 414         root->fs_info->tree_root = root;
 415         root->fs_info->quota_root = root;
 416         root->fs_info->quota_enabled = 1;
 417
 418         /*
 419          * Can't use bytenr 0, some things freak out
 420          * *cough*backref walking code*cough*
 421          */
 422         root->node = alloc_test_extent_buffer(root->fs_info, 4096);
 423         if (!root->node) {
 424                 test_msg("Couldn't allocate dummy buffer\n");
 425                 ret = -ENOMEM;
 426                 goto out;
 427         }
 428         btrfs_set_header_level(root->node, 0);
 429         btrfs_set_header_nritems(root->node, 0);
 430         root->alloc_bytenr += 8192;
 431
 432         tmp_root = btrfs_alloc_dummy_root();
 433         if (IS_ERR(tmp_root)) {
 434                 test_msg("Couldn't allocate a fs root\n");
 435                 ret = PTR_ERR(tmp_root);
 436                 goto out;
 437         }
 438
 439         tmp_root->root_key.objectid = 5;
 440         root->fs_info->fs_root = tmp_root;
 441         ret = btrfs_insert_fs_root(root->fs_info, tmp_root);
 442         if (ret) {
 443                 test_msg("Couldn't insert fs root %d\n", ret);
 444                 goto out;
 445         }
 446
 447         tmp_root = btrfs_alloc_dummy_root();
 448         if (IS_ERR(tmp_root)) {
 449                 test_msg("Couldn't allocate a fs root\n");
 450                 ret = PTR_ERR(tmp_root);
 451                 goto out;
 452         }
 453
 454         tmp_root->root_key.objectid = 256;
 455         ret = btrfs_insert_fs_root(root->fs_info, tmp_root);
 456         if (ret) {
 457                 test_msg("Couldn't insert fs root %d\n", ret);
 458                 goto out;
 459         }
 460
 461         test_msg("Running qgroup tests\n");
 462         ret = test_no_shared_qgroup(root);
 463         if (ret)
 464                 goto out;
 465         ret = test_multiple_refs(root);
 466 out:
 467         btrfs_free_dummy_root(root);
 468         return ret;
 469 }