fs/btrfs/tests/inode-tests.c

   1 /*
   2  * Copyright (C) 2013 Fusion IO.  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 "../btrfs_inode.h"
  22 #include "../disk-io.h"
  23 #include "../extent_io.h"
  24 #include "../volumes.h"
  25
  26 static struct btrfs_fs_info *alloc_dummy_fs_info(void)
  27 {
  28         struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
  29                                                 GFP_NOFS);
  30         if (!fs_info)
  31                 return fs_info;
  32         fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices),
  33                                       GFP_NOFS);
  34         if (!fs_info->fs_devices) {
  35                 kfree(fs_info);
  36                 return NULL;
  37         }
  38         return fs_info;
  39 }
  40 static void free_dummy_root(struct btrfs_root *root)
  41 {
  42         if (!root)
  43                 return;
  44         if (root->fs_info) {
  45                 kfree(root->fs_info->fs_devices);
  46                 kfree(root->fs_info);
  47         }
  48         if (root->node)
  49                 free_extent_buffer(root->node);
  50         kfree(root);
  51 }
  52
  53 static void insert_extent(struct btrfs_root *root, u64 start, u64 len,
  54                           u64 ram_bytes, u64 offset, u64 disk_bytenr,
  55                           u64 disk_len, u32 type, u8 compression, int slot)
  56 {
  57         struct btrfs_path path;
  58         struct btrfs_file_extent_item *fi;
  59         struct extent_buffer *leaf = root->node;
  60         struct btrfs_key key;
  61         u32 value_len = sizeof(struct btrfs_file_extent_item);
  62
  63         if (type == BTRFS_FILE_EXTENT_INLINE)
  64                 value_len += len;
  65         memset(&path, 0, sizeof(path));
  66
  67         path.nodes[0] = leaf;
  68         path.slots[0] = slot;
  69
  70         key.objectid = BTRFS_FIRST_FREE_OBJECTID;
  71         key.type = BTRFS_EXTENT_DATA_KEY;
  72         key.offset = start;
  73
  74         setup_items_for_insert(root, &path, &key, &value_len, value_len,
  75                                value_len + sizeof(struct btrfs_item), 1);
  76         fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
  77         btrfs_set_file_extent_generation(leaf, fi, 1);
  78         btrfs_set_file_extent_type(leaf, fi, type);
  79         btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
  80         btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_len);
  81         btrfs_set_file_extent_offset(leaf, fi, offset);
  82         btrfs_set_file_extent_num_bytes(leaf, fi, len);
  83         btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
  84         btrfs_set_file_extent_compression(leaf, fi, compression);
  85         btrfs_set_file_extent_encryption(leaf, fi, 0);
  86         btrfs_set_file_extent_other_encoding(leaf, fi, 0);
  87 }
  88
  89 static void insert_inode_item_key(struct btrfs_root *root)
  90 {
  91         struct btrfs_path path;
  92         struct extent_buffer *leaf = root->node;
  93         struct btrfs_key key;
  94         u32 value_len = 0;
  95
  96         memset(&path, 0, sizeof(path));
  97
  98         path.nodes[0] = leaf;
  99         path.slots[0] = 0;
 100
 101         key.objectid = BTRFS_INODE_ITEM_KEY;
 102         key.type = BTRFS_INODE_ITEM_KEY;
 103         key.offset = 0;
 104
 105         setup_items_for_insert(root, &path, &key, &value_len, value_len,
 106                                value_len + sizeof(struct btrfs_item), 1);
 107 }
 108
 109 /*
 110  * Build the most complicated map of extents the earth has ever seen.  We want
 111  * this so we can test all of the corner cases of btrfs_get_extent.  Here is a
 112  * diagram of how the extents will look though this may not be possible we still
 113  * want to make sure everything acts normally (the last number is not inclusive)
 114  *
 115  * [0 - 5][5 -  6][6 - 10][10 - 4096][  4096 - 8192 ][8192 - 12288]
 116  * [hole ][inline][ hole ][ regular ][regular1 split][    hole    ]
 117  *
 118  * [ 12288 - 20480][20480 - 24576][  24576 - 28672  ][28672 - 36864][36864 - 45056]
 119  * [regular1 split][   prealloc1 ][prealloc1 written][   prealloc1 ][ compressed  ]
 120  *
 121  * [45056 - 49152][49152-53248][53248-61440][61440-65536][     65536+81920   ]
 122  * [ compressed1 ][  regular  ][compressed1][  regular  ][ hole but no extent]
 123  *
 124  * [81920-86016]
 125  * [  regular  ]
 126  */
 127 static void setup_file_extents(struct btrfs_root *root)
 128 {
 129         int slot = 0;
 130         u64 disk_bytenr = 1 * 1024 * 1024;
 131         u64 offset = 0;
 132
 133         /* First we want a hole */
 134         insert_extent(root, offset, 5, 5, 0, 0, 0, BTRFS_FILE_EXTENT_REG, 0,
 135                       slot);
 136         slot++;
 137         offset += 5;
 138
 139         /*
 140          * Now we want an inline extent, I don't think this is possible but hey
 141          * why not?  Also keep in mind if we have an inline extent it counts as
 142          * the whole first page.  If we were to expand it we would have to cow
 143          * and we wouldn't have an inline extent anymore.
 144          */
 145         insert_extent(root, offset, 1, 1, 0, 0, 0, BTRFS_FILE_EXTENT_INLINE, 0,
 146                       slot);
 147         slot++;
 148         offset = 4096;
 149
 150         /* Now another hole */
 151         insert_extent(root, offset, 4, 4, 0, 0, 0, BTRFS_FILE_EXTENT_REG, 0,
 152                       slot);
 153         slot++;
 154         offset += 4;
 155
 156         /* Now for a regular extent */
 157         insert_extent(root, offset, 4095, 4095, 0, disk_bytenr, 4096,
 158                       BTRFS_FILE_EXTENT_REG, 0, slot);
 159         slot++;
 160         disk_bytenr += 4096;
 161         offset += 4095;
 162
 163         /*
 164          * Now for 3 extents that were split from a hole punch so we test
 165          * offsets properly.
 166          */
 167         insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 16384,
 168                       BTRFS_FILE_EXTENT_REG, 0, slot);
 169         slot++;
 170         offset += 4096;
 171         insert_extent(root, offset, 4096, 4096, 0, 0, 0, BTRFS_FILE_EXTENT_REG,
 172                       0, slot);
 173         slot++;
 174         offset += 4096;
 175         insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 16384,
 176                       BTRFS_FILE_EXTENT_REG, 0, slot);
 177         slot++;
 178         offset += 8192;
 179         disk_bytenr += 16384;
 180
 181         /* Now for a unwritten prealloc extent */
 182         insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
 183                       BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
 184         slot++;
 185         offset += 4096;
 186
 187         /*
 188          * We want to jack up disk_bytenr a little more so the em stuff doesn't
 189          * merge our records.
 190          */
 191         disk_bytenr += 8192;
 192
 193         /*
 194          * Now for a partially written prealloc extent, basically the same as
 195          * the hole punch example above.  Ram_bytes never changes when you mark
 196          * extents written btw.
 197          */
 198         insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 16384,
 199                       BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
 200         slot++;
 201         offset += 4096;
 202         insert_extent(root, offset, 4096, 16384, 4096, disk_bytenr, 16384,
 203                       BTRFS_FILE_EXTENT_REG, 0, slot);
 204         slot++;
 205         offset += 4096;
 206         insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 16384,
 207                       BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
 208         slot++;
 209         offset += 8192;
 210         disk_bytenr += 16384;
 211
 212         /* Now a normal compressed extent */
 213         insert_extent(root, offset, 8192, 8192, 0, disk_bytenr, 4096,
 214                       BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
 215         slot++;
 216         offset += 8192;
 217         /* No merges */
 218         disk_bytenr += 8192;
 219
 220         /* Now a split compressed extent */
 221         insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 4096,
 222                       BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
 223         slot++;
 224         offset += 4096;
 225         insert_extent(root, offset, 4096, 4096, 0, disk_bytenr + 4096, 4096,
 226                       BTRFS_FILE_EXTENT_REG, 0, slot);
 227         slot++;
 228         offset += 4096;
 229         insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 4096,
 230                       BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
 231         slot++;
 232         offset += 8192;
 233         disk_bytenr += 8192;
 234
 235         /* Now extents that have a hole but no hole extent */
 236         insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
 237                       BTRFS_FILE_EXTENT_REG, 0, slot);
 238         slot++;
 239         offset += 16384;
 240         disk_bytenr += 4096;
 241         insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
 242                       BTRFS_FILE_EXTENT_REG, 0, slot);
 243 }
 244
 245 static unsigned long prealloc_only = 0;
 246 static unsigned long compressed_only = 0;
 247 static unsigned long vacancy_only = 0;
 248
 249 static noinline int test_btrfs_get_extent(void)
 250 {
 251         struct inode *inode = NULL;
 252         struct btrfs_root *root = NULL;
 253         struct extent_map *em = NULL;
 254         u64 orig_start;
 255         u64 disk_bytenr;
 256         u64 offset;
 257         int ret = -ENOMEM;
 258
 259         inode = btrfs_new_test_inode();
 260         if (!inode) {
 261                 test_msg("Couldn't allocate inode\n");
 262                 return ret;
 263         }
 264
 265         BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
 266         BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
 267         BTRFS_I(inode)->location.offset = 0;
 268
 269         root = btrfs_alloc_dummy_root();
 270         if (IS_ERR(root)) {
 271                 test_msg("Couldn't allocate root\n");
 272                 goto out;
 273         }
 274
 275         /*
 276          * We do this since btrfs_get_extent wants to assign em->bdev to
 277          * root->fs_info->fs_devices->latest_bdev.
 278          */
 279         root->fs_info = alloc_dummy_fs_info();
 280         if (!root->fs_info) {
 281                 test_msg("Couldn't allocate dummy fs info\n");
 282                 goto out;
 283         }
 284
 285         root->node = alloc_dummy_extent_buffer(0, 4096);
 286         if (!root->node) {
 287                 test_msg("Couldn't allocate dummy buffer\n");
 288                 goto out;
 289         }
 290
 291         /*
 292          * We will just free a dummy node if it's ref count is 2 so we need an
 293          * extra ref so our searches don't accidently release our page.
 294          */
 295         extent_buffer_get(root->node);
 296         btrfs_set_header_nritems(root->node, 0);
 297         btrfs_set_header_level(root->node, 0);
 298         ret = -EINVAL;
 299
 300         /* First with no extents */
 301         BTRFS_I(inode)->root = root;
 302         em = btrfs_get_extent(inode, NULL, 0, 0, 4096, 0);
 303         if (IS_ERR(em)) {
 304                 em = NULL;
 305                 test_msg("Got an error when we shouldn't have\n");
 306                 goto out;
 307         }
 308         if (em->block_start != EXTENT_MAP_HOLE) {
 309                 test_msg("Expected a hole, got %llu\n", em->block_start);
 310                 goto out;
 311         }
 312         if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags)) {
 313                 test_msg("Vacancy flag wasn't set properly\n");
 314                 goto out;
 315         }
 316         free_extent_map(em);
 317         btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
 318
 319         /*
 320          * All of the magic numbers are based on the mapping setup in
 321          * setup_file_extents, so if you change anything there you need to
 322          * update the comment and update the expected values below.
 323          */
 324         setup_file_extents(root);
 325
 326         em = btrfs_get_extent(inode, NULL, 0, 0, (u64)-1, 0);
 327         if (IS_ERR(em)) {
 328                 test_msg("Got an error when we shouldn't have\n");
 329                 goto out;
 330         }
 331         if (em->block_start != EXTENT_MAP_HOLE) {
 332                 test_msg("Expected a hole, got %llu\n", em->block_start);
 333                 goto out;
 334         }
 335         if (em->start != 0 || em->len != 5) {
 336                 test_msg("Unexpected extent wanted start 0 len 5, got start "
 337                          "%llu len %llu\n", em->start, em->len);
 338                 goto out;
 339         }
 340         if (em->flags != 0) {
 341                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 342                 goto out;
 343         }
 344         offset = em->start + em->len;
 345         free_extent_map(em);
 346
 347         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 348         if (IS_ERR(em)) {
 349                 test_msg("Got an error when we shouldn't have\n");
 350                 goto out;
 351         }
 352         if (em->block_start != EXTENT_MAP_INLINE) {
 353                 test_msg("Expected an inline, got %llu\n", em->block_start);
 354                 goto out;
 355         }
 356         if (em->start != offset || em->len != 4091) {
 357                 test_msg("Unexpected extent wanted start %llu len 1, got start "
 358                          "%llu len %llu\n", offset, em->start, em->len);
 359                 goto out;
 360         }
 361         if (em->flags != 0) {
 362                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 363                 goto out;
 364         }
 365         /*
 366          * We don't test anything else for inline since it doesn't get set
 367          * unless we have a page for it to write into.  Maybe we should change
 368          * this?
 369          */
 370         offset = em->start + em->len;
 371         free_extent_map(em);
 372
 373         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 374         if (IS_ERR(em)) {
 375                 test_msg("Got an error when we shouldn't have\n");
 376                 goto out;
 377         }
 378         if (em->block_start != EXTENT_MAP_HOLE) {
 379                 test_msg("Expected a hole, got %llu\n", em->block_start);
 380                 goto out;
 381         }
 382         if (em->start != offset || em->len != 4) {
 383                 test_msg("Unexpected extent wanted start %llu len 4, got start "
 384                          "%llu len %llu\n", offset, em->start, em->len);
 385                 goto out;
 386         }
 387         if (em->flags != 0) {
 388                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 389                 goto out;
 390         }
 391         offset = em->start + em->len;
 392         free_extent_map(em);
 393
 394         /* Regular extent */
 395         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 396         if (IS_ERR(em)) {
 397                 test_msg("Got an error when we shouldn't have\n");
 398                 goto out;
 399         }
 400         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 401                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 402                 goto out;
 403         }
 404         if (em->start != offset || em->len != 4095) {
 405                 test_msg("Unexpected extent wanted start %llu len 4095, got "
 406                          "start %llu len %llu\n", offset, em->start, em->len);
 407                 goto out;
 408         }
 409         if (em->flags != 0) {
 410                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 411                 goto out;
 412         }
 413         if (em->orig_start != em->start) {
 414                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 415                          em->orig_start);
 416                 goto out;
 417         }
 418         offset = em->start + em->len;
 419         free_extent_map(em);
 420
 421         /* The next 3 are split extents */
 422         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 423         if (IS_ERR(em)) {
 424                 test_msg("Got an error when we shouldn't have\n");
 425                 goto out;
 426         }
 427         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 428                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 429                 goto out;
 430         }
 431         if (em->start != offset || em->len != 4096) {
 432                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 433                          "start %llu len %llu\n", offset, em->start, em->len);
 434                 goto out;
 435         }
 436         if (em->flags != 0) {
 437                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 438                 goto out;
 439         }
 440         if (em->orig_start != em->start) {
 441                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 442                          em->orig_start);
 443                 goto out;
 444         }
 445         disk_bytenr = em->block_start;
 446         orig_start = em->start;
 447         offset = em->start + em->len;
 448         free_extent_map(em);
 449
 450         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 451         if (IS_ERR(em)) {
 452                 test_msg("Got an error when we shouldn't have\n");
 453                 goto out;
 454         }
 455         if (em->block_start != EXTENT_MAP_HOLE) {
 456                 test_msg("Expected a hole, got %llu\n", em->block_start);
 457                 goto out;
 458         }
 459         if (em->start != offset || em->len != 4096) {
 460                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 461                          "start %llu len %llu\n", offset, em->start, em->len);
 462                 goto out;
 463         }
 464         if (em->flags != 0) {
 465                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 466                 goto out;
 467         }
 468         offset = em->start + em->len;
 469         free_extent_map(em);
 470
 471         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 472         if (IS_ERR(em)) {
 473                 test_msg("Got an error when we shouldn't have\n");
 474                 goto out;
 475         }
 476         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 477                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 478                 goto out;
 479         }
 480         if (em->start != offset || em->len != 8192) {
 481                 test_msg("Unexpected extent wanted start %llu len 8192, got "
 482                          "start %llu len %llu\n", offset, em->start, em->len);
 483                 goto out;
 484         }
 485         if (em->flags != 0) {
 486                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 487                 goto out;
 488         }
 489         if (em->orig_start != orig_start) {
 490                 test_msg("Wrong orig offset, want %llu, have %llu\n",
 491                          orig_start, em->orig_start);
 492                 goto out;
 493         }
 494         disk_bytenr += (em->start - orig_start);
 495         if (em->block_start != disk_bytenr) {
 496                 test_msg("Wrong block start, want %llu, have %llu\n",
 497                          disk_bytenr, em->block_start);
 498                 goto out;
 499         }
 500         offset = em->start + em->len;
 501         free_extent_map(em);
 502
 503         /* Prealloc extent */
 504         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 505         if (IS_ERR(em)) {
 506                 test_msg("Got an error when we shouldn't have\n");
 507                 goto out;
 508         }
 509         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 510                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 511                 goto out;
 512         }
 513         if (em->start != offset || em->len != 4096) {
 514                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 515                          "start %llu len %llu\n", offset, em->start, em->len);
 516                 goto out;
 517         }
 518         if (em->flags != prealloc_only) {
 519                 test_msg("Unexpected flags set, want %lu have %lu\n",
 520                          prealloc_only, em->flags);
 521                 goto out;
 522         }
 523         if (em->orig_start != em->start) {
 524                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 525                          em->orig_start);
 526                 goto out;
 527         }
 528         offset = em->start + em->len;
 529         free_extent_map(em);
 530
 531         /* The next 3 are a half written prealloc extent */
 532         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 533         if (IS_ERR(em)) {
 534                 test_msg("Got an error when we shouldn't have\n");
 535                 goto out;
 536         }
 537         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 538                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 539                 goto out;
 540         }
 541         if (em->start != offset || em->len != 4096) {
 542                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 543                          "start %llu len %llu\n", offset, em->start, em->len);
 544                 goto out;
 545         }
 546         if (em->flags != prealloc_only) {
 547                 test_msg("Unexpected flags set, want %lu have %lu\n",
 548                          prealloc_only, em->flags);
 549                 goto out;
 550         }
 551         if (em->orig_start != em->start) {
 552                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 553                          em->orig_start);
 554                 goto out;
 555         }
 556         disk_bytenr = em->block_start;
 557         orig_start = em->start;
 558         offset = em->start + em->len;
 559         free_extent_map(em);
 560
 561         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 562         if (IS_ERR(em)) {
 563                 test_msg("Got an error when we shouldn't have\n");
 564                 goto out;
 565         }
 566         if (em->block_start >= EXTENT_MAP_HOLE) {
 567                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 568                 goto out;
 569         }
 570         if (em->start != offset || em->len != 4096) {
 571                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 572                          "start %llu len %llu\n", offset, em->start, em->len);
 573                 goto out;
 574         }
 575         if (em->flags != 0) {
 576                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 577                 goto out;
 578         }
 579         if (em->orig_start != orig_start) {
 580                 test_msg("Unexpected orig offset, wanted %llu, have %llu\n",
 581                          orig_start, em->orig_start);
 582                 goto out;
 583         }
 584         if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
 585                 test_msg("Unexpected block start, wanted %llu, have %llu\n",
 586                          disk_bytenr + (em->start - em->orig_start),
 587                          em->block_start);
 588                 goto out;
 589         }
 590         offset = em->start + em->len;
 591         free_extent_map(em);
 592
 593         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 594         if (IS_ERR(em)) {
 595                 test_msg("Got an error when we shouldn't have\n");
 596                 goto out;
 597         }
 598         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 599                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 600                 goto out;
 601         }
 602         if (em->start != offset || em->len != 8192) {
 603                 test_msg("Unexpected extent wanted start %llu len 8192, got "
 604                          "start %llu len %llu\n", offset, em->start, em->len);
 605                 goto out;
 606         }
 607         if (em->flags != prealloc_only) {
 608                 test_msg("Unexpected flags set, want %lu have %lu\n",
 609                          prealloc_only, em->flags);
 610                 goto out;
 611         }
 612         if (em->orig_start != orig_start) {
 613                 test_msg("Wrong orig offset, want %llu, have %llu\n", orig_start,
 614                          em->orig_start);
 615                 goto out;
 616         }
 617         if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
 618                 test_msg("Unexpected block start, wanted %llu, have %llu\n",
 619                          disk_bytenr + (em->start - em->orig_start),
 620                          em->block_start);
 621                 goto out;
 622         }
 623         offset = em->start + em->len;
 624         free_extent_map(em);
 625
 626         /* Now for the compressed extent */
 627         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 628         if (IS_ERR(em)) {
 629                 test_msg("Got an error when we shouldn't have\n");
 630                 goto out;
 631         }
 632         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 633                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 634                 goto out;
 635         }
 636         if (em->start != offset || em->len != 8192) {
 637                 test_msg("Unexpected extent wanted start %llu len 8192, got "
 638                          "start %llu len %llu\n", offset, em->start, em->len);
 639                 goto out;
 640         }
 641         if (em->flags != compressed_only) {
 642                 test_msg("Unexpected flags set, want %lu have %lu\n",
 643                          compressed_only, em->flags);
 644                 goto out;
 645         }
 646         if (em->orig_start != em->start) {
 647                 test_msg("Wrong orig offset, want %llu, have %llu\n",
 648                          em->start, em->orig_start);
 649                 goto out;
 650         }
 651         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 652                 test_msg("Unexpected compress type, wanted %d, got %d\n",
 653                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 654                 goto out;
 655         }
 656         offset = em->start + em->len;
 657         free_extent_map(em);
 658
 659         /* Split compressed extent */
 660         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 661         if (IS_ERR(em)) {
 662                 test_msg("Got an error when we shouldn't have\n");
 663                 goto out;
 664         }
 665         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 666                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 667                 goto out;
 668         }
 669         if (em->start != offset || em->len != 4096) {
 670                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 671                          "start %llu len %llu\n", offset, em->start, em->len);
 672                 goto out;
 673         }
 674         if (em->flags != compressed_only) {
 675                 test_msg("Unexpected flags set, want %lu have %lu\n",
 676                          compressed_only, em->flags);
 677                 goto out;
 678         }
 679         if (em->orig_start != em->start) {
 680                 test_msg("Wrong orig offset, want %llu, have %llu\n",
 681                          em->start, em->orig_start);
 682                 goto out;
 683         }
 684         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 685                 test_msg("Unexpected compress type, wanted %d, got %d\n",
 686                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 687                 goto out;
 688         }
 689         disk_bytenr = em->block_start;
 690         orig_start = em->start;
 691         offset = em->start + em->len;
 692         free_extent_map(em);
 693
 694         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 695         if (IS_ERR(em)) {
 696                 test_msg("Got an error when we shouldn't have\n");
 697                 goto out;
 698         }
 699         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 700                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 701                 goto out;
 702         }
 703         if (em->start != offset || em->len != 4096) {
 704                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 705                          "start %llu len %llu\n", offset, em->start, em->len);
 706                 goto out;
 707         }
 708         if (em->flags != 0) {
 709                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 710                 goto out;
 711         }
 712         if (em->orig_start != em->start) {
 713                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 714                          em->orig_start);
 715                 goto out;
 716         }
 717         offset = em->start + em->len;
 718         free_extent_map(em);
 719
 720         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 721         if (IS_ERR(em)) {
 722                 test_msg("Got an error when we shouldn't have\n");
 723                 goto out;
 724         }
 725         if (em->block_start != disk_bytenr) {
 726                 test_msg("Block start does not match, want %llu got %llu\n",
 727                          disk_bytenr, em->block_start);
 728                 goto out;
 729         }
 730         if (em->start != offset || em->len != 8192) {
 731                 test_msg("Unexpected extent wanted start %llu len 8192, got "
 732                          "start %llu len %llu\n", offset, em->start, em->len);
 733                 goto out;
 734         }
 735         if (em->flags != compressed_only) {
 736                 test_msg("Unexpected flags set, want %lu have %lu\n",
 737                          compressed_only, em->flags);
 738                 goto out;
 739         }
 740         if (em->orig_start != orig_start) {
 741                 test_msg("Wrong orig offset, want %llu, have %llu\n",
 742                          em->start, orig_start);
 743                 goto out;
 744         }
 745         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 746                 test_msg("Unexpected compress type, wanted %d, got %d\n",
 747                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 748                 goto out;
 749         }
 750         offset = em->start + em->len;
 751         free_extent_map(em);
 752
 753         /* A hole between regular extents but no hole extent */
 754         em = btrfs_get_extent(inode, NULL, 0, offset + 6, 4096, 0);
 755         if (IS_ERR(em)) {
 756                 test_msg("Got an error when we shouldn't have\n");
 757                 goto out;
 758         }
 759         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 760                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 761                 goto out;
 762         }
 763         if (em->start != offset || em->len != 4096) {
 764                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 765                          "start %llu len %llu\n", offset, em->start, em->len);
 766                 goto out;
 767         }
 768         if (em->flags != 0) {
 769                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 770                 goto out;
 771         }
 772         if (em->orig_start != em->start) {
 773                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 774                          em->orig_start);
 775                 goto out;
 776         }
 777         offset = em->start + em->len;
 778         free_extent_map(em);
 779
 780         em = btrfs_get_extent(inode, NULL, 0, offset, 4096 * 1024, 0);
 781         if (IS_ERR(em)) {
 782                 test_msg("Got an error when we shouldn't have\n");
 783                 goto out;
 784         }
 785         if (em->block_start != EXTENT_MAP_HOLE) {
 786                 test_msg("Expected a hole extent, got %llu\n", em->block_start);
 787                 goto out;
 788         }
 789         /*
 790          * Currently we just return a length that we requested rather than the
 791          * length of the actual hole, if this changes we'll have to change this
 792          * test.
 793          */
 794         if (em->start != offset || em->len != 12288) {
 795                 test_msg("Unexpected extent wanted start %llu len 12288, got "
 796                          "start %llu len %llu\n", offset, em->start, em->len);
 797                 goto out;
 798         }
 799         if (em->flags != vacancy_only) {
 800                 test_msg("Unexpected flags set, want %lu have %lu\n",
 801                          vacancy_only, em->flags);
 802                 goto out;
 803         }
 804         if (em->orig_start != em->start) {
 805                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 806                          em->orig_start);
 807                 goto out;
 808         }
 809         offset = em->start + em->len;
 810         free_extent_map(em);
 811
 812         em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
 813         if (IS_ERR(em)) {
 814                 test_msg("Got an error when we shouldn't have\n");
 815                 goto out;
 816         }
 817         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 818                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 819                 goto out;
 820         }
 821         if (em->start != offset || em->len != 4096) {
 822                 test_msg("Unexpected extent wanted start %llu len 4096, got "
 823                          "start %llu len %llu\n", offset, em->start, em->len);
 824                 goto out;
 825         }
 826         if (em->flags != 0) {
 827                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 828                 goto out;
 829         }
 830         if (em->orig_start != em->start) {
 831                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 832                          em->orig_start);
 833                 goto out;
 834         }
 835         ret = 0;
 836 out:
 837         if (!IS_ERR(em))
 838                 free_extent_map(em);
 839         iput(inode);
 840         free_dummy_root(root);
 841         return ret;
 842 }
 843
 844 static int test_hole_first(void)
 845 {
 846         struct inode *inode = NULL;
 847         struct btrfs_root *root = NULL;
 848         struct extent_map *em = NULL;
 849         int ret = -ENOMEM;
 850
 851         inode = btrfs_new_test_inode();
 852         if (!inode) {
 853                 test_msg("Couldn't allocate inode\n");
 854                 return ret;
 855         }
 856
 857         BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
 858         BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
 859         BTRFS_I(inode)->location.offset = 0;
 860
 861         root = btrfs_alloc_dummy_root();
 862         if (IS_ERR(root)) {
 863                 test_msg("Couldn't allocate root\n");
 864                 goto out;
 865         }
 866
 867         root->fs_info = alloc_dummy_fs_info();
 868         if (!root->fs_info) {
 869                 test_msg("Couldn't allocate dummy fs info\n");
 870                 goto out;
 871         }
 872
 873         root->node = alloc_dummy_extent_buffer(0, 4096);
 874         if (!root->node) {
 875                 test_msg("Couldn't allocate dummy buffer\n");
 876                 goto out;
 877         }
 878
 879         extent_buffer_get(root->node);
 880         btrfs_set_header_nritems(root->node, 0);
 881         btrfs_set_header_level(root->node, 0);
 882         BTRFS_I(inode)->root = root;
 883         ret = -EINVAL;
 884
 885         /*
 886          * Need a blank inode item here just so we don't confuse
 887          * btrfs_get_extent.
 888          */
 889         insert_inode_item_key(root);
 890         insert_extent(root, 4096, 4096, 4096, 0, 4096, 4096,
 891                       BTRFS_FILE_EXTENT_REG, 0, 1);
 892         em = btrfs_get_extent(inode, NULL, 0, 0, 8192, 0);
 893         if (IS_ERR(em)) {
 894                 test_msg("Got an error when we shouldn't have\n");
 895                 goto out;
 896         }
 897         if (em->block_start != EXTENT_MAP_HOLE) {
 898                 test_msg("Expected a hole, got %llu\n", em->block_start);
 899                 goto out;
 900         }
 901         if (em->start != 0 || em->len != 4096) {
 902                 test_msg("Unexpected extent wanted start 0 len 4096, got start "
 903                          "%llu len %llu\n", em->start, em->len);
 904                 goto out;
 905         }
 906         if (em->flags != vacancy_only) {
 907                 test_msg("Wrong flags, wanted %lu, have %lu\n", vacancy_only,
 908                          em->flags);
 909                 goto out;
 910         }
 911         free_extent_map(em);
 912
 913         em = btrfs_get_extent(inode, NULL, 0, 4096, 8192, 0);
 914         if (IS_ERR(em)) {
 915                 test_msg("Got an error when we shouldn't have\n");
 916                 goto out;
 917         }
 918         if (em->block_start != 4096) {
 919                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 920                 goto out;
 921         }
 922         if (em->start != 4096 || em->len != 4096) {
 923                 test_msg("Unexpected extent wanted start 4096 len 4096, got "
 924                          "start %llu len %llu\n", em->start, em->len);
 925                 goto out;
 926         }
 927         if (em->flags != 0) {
 928                 test_msg("Unexpected flags set, wanted 0 got %lu\n",
 929                          em->flags);
 930                 goto out;
 931         }
 932         ret = 0;
 933 out:
 934         if (!IS_ERR(em))
 935                 free_extent_map(em);
 936         iput(inode);
 937         free_dummy_root(root);
 938         return ret;
 939 }
 940
 941 int btrfs_test_inodes(void)
 942 {
 943         int ret;
 944
 945         set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
 946         set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);
 947         set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
 948
 949         test_msg("Running btrfs_get_extent tests\n");
 950         ret = test_btrfs_get_extent();
 951         if (ret)
 952                 return ret;
 953         test_msg("Running hole first btrfs_get_extent test\n");
 954         return test_hole_first();
 955 }