fs/btrfs/tests/inode-tests.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2013 Fusion IO.  All rights reserved.
   4  */
   5
   6 #include <linux/types.h>
   7 #include "btrfs-tests.h"
   8 #include "../ctree.h"
   9 #include "../btrfs_inode.h"
  10 #include "../disk-io.h"
  11 #include "../extent_io.h"
  12 #include "../volumes.h"
  13 #include "../compression.h"
  14
  15 static void insert_extent(struct btrfs_root *root, u64 start, u64 len,
  16                           u64 ram_bytes, u64 offset, u64 disk_bytenr,
  17                           u64 disk_len, u32 type, u8 compression, int slot)
  18 {
  19         struct btrfs_path path;
  20         struct btrfs_file_extent_item *fi;
  21         struct extent_buffer *leaf = root->node;
  22         struct btrfs_key key;
  23         u32 value_len = sizeof(struct btrfs_file_extent_item);
  24
  25         if (type == BTRFS_FILE_EXTENT_INLINE)
  26                 value_len += len;
  27         memset(&path, 0, sizeof(path));
  28
  29         path.nodes[0] = leaf;
  30         path.slots[0] = slot;
  31
  32         key.objectid = BTRFS_FIRST_FREE_OBJECTID;
  33         key.type = BTRFS_EXTENT_DATA_KEY;
  34         key.offset = start;
  35
  36         setup_items_for_insert(root, &path, &key, &value_len, value_len,
  37                                value_len + sizeof(struct btrfs_item), 1);
  38         fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
  39         btrfs_set_file_extent_generation(leaf, fi, 1);
  40         btrfs_set_file_extent_type(leaf, fi, type);
  41         btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
  42         btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_len);
  43         btrfs_set_file_extent_offset(leaf, fi, offset);
  44         btrfs_set_file_extent_num_bytes(leaf, fi, len);
  45         btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
  46         btrfs_set_file_extent_compression(leaf, fi, compression);
  47         btrfs_set_file_extent_encryption(leaf, fi, 0);
  48         btrfs_set_file_extent_other_encoding(leaf, fi, 0);
  49 }
  50
  51 static void insert_inode_item_key(struct btrfs_root *root)
  52 {
  53         struct btrfs_path path;
  54         struct extent_buffer *leaf = root->node;
  55         struct btrfs_key key;
  56         u32 value_len = 0;
  57
  58         memset(&path, 0, sizeof(path));
  59
  60         path.nodes[0] = leaf;
  61         path.slots[0] = 0;
  62
  63         key.objectid = BTRFS_INODE_ITEM_KEY;
  64         key.type = BTRFS_INODE_ITEM_KEY;
  65         key.offset = 0;
  66
  67         setup_items_for_insert(root, &path, &key, &value_len, value_len,
  68                                value_len + sizeof(struct btrfs_item), 1);
  69 }
  70
  71 /*
  72  * Build the most complicated map of extents the earth has ever seen.  We want
  73  * this so we can test all of the corner cases of btrfs_get_extent.  Here is a
  74  * diagram of how the extents will look though this may not be possible we still
  75  * want to make sure everything acts normally (the last number is not inclusive)
  76  *
  77  * [0 - 5][5 -  6][     6 - 4096     ][ 4096 - 4100][4100 - 8195][8195 - 12291]
  78  * [hole ][inline][hole but no extent][  hole   ][   regular ][regular1 split]
  79  *
  80  * [12291 - 16387][16387 - 24579][24579 - 28675][ 28675 - 32771][32771 - 36867 ]
  81  * [    hole    ][regular1 split][   prealloc ][   prealloc1  ][prealloc1 written]
  82  *
  83  * [36867 - 45059][45059 - 53251][53251 - 57347][57347 - 61443][61443- 69635]
  84  * [  prealloc1  ][ compressed  ][ compressed1 ][    regular  ][ compressed1]
  85  *
  86  * [69635-73731][   73731 - 86019   ][86019-90115]
  87  * [  regular  ][ hole but no extent][  regular  ]
  88  */
  89 static void setup_file_extents(struct btrfs_root *root, u32 sectorsize)
  90 {
  91         int slot = 0;
  92         u64 disk_bytenr = SZ_1M;
  93         u64 offset = 0;
  94
  95         /* First we want a hole */
  96         insert_extent(root, offset, 5, 5, 0, 0, 0, BTRFS_FILE_EXTENT_REG, 0,
  97                       slot);
  98         slot++;
  99         offset += 5;
 100
 101         /*
 102          * Now we want an inline extent, I don't think this is possible but hey
 103          * why not?  Also keep in mind if we have an inline extent it counts as
 104          * the whole first page.  If we were to expand it we would have to cow
 105          * and we wouldn't have an inline extent anymore.
 106          */
 107         insert_extent(root, offset, 1, 1, 0, 0, 0, BTRFS_FILE_EXTENT_INLINE, 0,
 108                       slot);
 109         slot++;
 110         offset = sectorsize;
 111
 112         /* Now another hole */
 113         insert_extent(root, offset, 4, 4, 0, 0, 0, BTRFS_FILE_EXTENT_REG, 0,
 114                       slot);
 115         slot++;
 116         offset += 4;
 117
 118         /* Now for a regular extent */
 119         insert_extent(root, offset, sectorsize - 1, sectorsize - 1, 0,
 120                       disk_bytenr, sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
 121         slot++;
 122         disk_bytenr += sectorsize;
 123         offset += sectorsize - 1;
 124
 125         /*
 126          * Now for 3 extents that were split from a hole punch so we test
 127          * offsets properly.
 128          */
 129         insert_extent(root, offset, sectorsize, 4 * sectorsize, 0, disk_bytenr,
 130                       4 * sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
 131         slot++;
 132         offset += sectorsize;
 133         insert_extent(root, offset, sectorsize, sectorsize, 0, 0, 0,
 134                       BTRFS_FILE_EXTENT_REG, 0, slot);
 135         slot++;
 136         offset += sectorsize;
 137         insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
 138                       2 * sectorsize, disk_bytenr, 4 * sectorsize,
 139                       BTRFS_FILE_EXTENT_REG, 0, slot);
 140         slot++;
 141         offset += 2 * sectorsize;
 142         disk_bytenr += 4 * sectorsize;
 143
 144         /* Now for a unwritten prealloc extent */
 145         insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
 146                 sectorsize, BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
 147         slot++;
 148         offset += sectorsize;
 149
 150         /*
 151          * We want to jack up disk_bytenr a little more so the em stuff doesn't
 152          * merge our records.
 153          */
 154         disk_bytenr += 2 * sectorsize;
 155
 156         /*
 157          * Now for a partially written prealloc extent, basically the same as
 158          * the hole punch example above.  Ram_bytes never changes when you mark
 159          * extents written btw.
 160          */
 161         insert_extent(root, offset, sectorsize, 4 * sectorsize, 0, disk_bytenr,
 162                       4 * sectorsize, BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
 163         slot++;
 164         offset += sectorsize;
 165         insert_extent(root, offset, sectorsize, 4 * sectorsize, sectorsize,
 166                       disk_bytenr, 4 * sectorsize, BTRFS_FILE_EXTENT_REG, 0,
 167                       slot);
 168         slot++;
 169         offset += sectorsize;
 170         insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
 171                       2 * sectorsize, disk_bytenr, 4 * sectorsize,
 172                       BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
 173         slot++;
 174         offset += 2 * sectorsize;
 175         disk_bytenr += 4 * sectorsize;
 176
 177         /* Now a normal compressed extent */
 178         insert_extent(root, offset, 2 * sectorsize, 2 * sectorsize, 0,
 179                       disk_bytenr, sectorsize, BTRFS_FILE_EXTENT_REG,
 180                       BTRFS_COMPRESS_ZLIB, slot);
 181         slot++;
 182         offset += 2 * sectorsize;
 183         /* No merges */
 184         disk_bytenr += 2 * sectorsize;
 185
 186         /* Now a split compressed extent */
 187         insert_extent(root, offset, sectorsize, 4 * sectorsize, 0, disk_bytenr,
 188                       sectorsize, BTRFS_FILE_EXTENT_REG,
 189                       BTRFS_COMPRESS_ZLIB, slot);
 190         slot++;
 191         offset += sectorsize;
 192         insert_extent(root, offset, sectorsize, sectorsize, 0,
 193                       disk_bytenr + sectorsize, sectorsize,
 194                       BTRFS_FILE_EXTENT_REG, 0, slot);
 195         slot++;
 196         offset += sectorsize;
 197         insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
 198                       2 * sectorsize, disk_bytenr, sectorsize,
 199                       BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
 200         slot++;
 201         offset += 2 * sectorsize;
 202         disk_bytenr += 2 * sectorsize;
 203
 204         /* Now extents that have a hole but no hole extent */
 205         insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
 206                       sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
 207         slot++;
 208         offset += 4 * sectorsize;
 209         disk_bytenr += sectorsize;
 210         insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
 211                       sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
 212 }
 213
 214 static unsigned long prealloc_only = 0;
 215 static unsigned long compressed_only = 0;
 216 static unsigned long vacancy_only = 0;
 217
 218 static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
 219 {
 220         struct btrfs_fs_info *fs_info = NULL;
 221         struct inode *inode = NULL;
 222         struct btrfs_root *root = NULL;
 223         struct extent_map *em = NULL;
 224         u64 orig_start;
 225         u64 disk_bytenr;
 226         u64 offset;
 227         int ret = -ENOMEM;
 228
 229         inode = btrfs_new_test_inode();
 230         if (!inode) {
 231                 test_msg("Couldn't allocate inode\n");
 232                 return ret;
 233         }
 234
 235         BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
 236         BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
 237         BTRFS_I(inode)->location.offset = 0;
 238
 239         fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
 240         if (!fs_info) {
 241                 test_msg("Couldn't allocate dummy fs info\n");
 242                 goto out;
 243         }
 244
 245         root = btrfs_alloc_dummy_root(fs_info);
 246         if (IS_ERR(root)) {
 247                 test_msg("Couldn't allocate root\n");
 248                 goto out;
 249         }
 250
 251         root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
 252         if (!root->node) {
 253                 test_msg("Couldn't allocate dummy buffer\n");
 254                 goto out;
 255         }
 256
 257         /*
 258          * We will just free a dummy node if it's ref count is 2 so we need an
 259          * extra ref so our searches don't accidentally release our page.
 260          */
 261         extent_buffer_get(root->node);
 262         btrfs_set_header_nritems(root->node, 0);
 263         btrfs_set_header_level(root->node, 0);
 264         ret = -EINVAL;
 265
 266         /* First with no extents */
 267         BTRFS_I(inode)->root = root;
 268         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, 0, sectorsize, 0);
 269         if (IS_ERR(em)) {
 270                 em = NULL;
 271                 test_msg("Got an error when we shouldn't have\n");
 272                 goto out;
 273         }
 274         if (em->block_start != EXTENT_MAP_HOLE) {
 275                 test_msg("Expected a hole, got %llu\n", em->block_start);
 276                 goto out;
 277         }
 278         free_extent_map(em);
 279         btrfs_drop_extent_cache(BTRFS_I(inode), 0, (u64)-1, 0);
 280
 281         /*
 282          * All of the magic numbers are based on the mapping setup in
 283          * setup_file_extents, so if you change anything there you need to
 284          * update the comment and update the expected values below.
 285          */
 286         setup_file_extents(root, sectorsize);
 287
 288         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, 0, (u64)-1, 0);
 289         if (IS_ERR(em)) {
 290                 test_msg("Got an error when we shouldn't have\n");
 291                 goto out;
 292         }
 293         if (em->block_start != EXTENT_MAP_HOLE) {
 294                 test_msg("Expected a hole, got %llu\n", em->block_start);
 295                 goto out;
 296         }
 297         if (em->start != 0 || em->len != 5) {
 298                 test_msg("Unexpected extent wanted start 0 len 5, got start "
 299                          "%llu len %llu\n", em->start, em->len);
 300                 goto out;
 301         }
 302         if (em->flags != 0) {
 303                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 304                 goto out;
 305         }
 306         offset = em->start + em->len;
 307         free_extent_map(em);
 308
 309         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 310         if (IS_ERR(em)) {
 311                 test_msg("Got an error when we shouldn't have\n");
 312                 goto out;
 313         }
 314         if (em->block_start != EXTENT_MAP_INLINE) {
 315                 test_msg("Expected an inline, got %llu\n", em->block_start);
 316                 goto out;
 317         }
 318
 319         if (em->start != offset || em->len != (sectorsize - 5)) {
 320                 test_msg("Unexpected extent wanted start %llu len 1, got start "
 321                          "%llu len %llu\n", offset, em->start, em->len);
 322                 goto out;
 323         }
 324         if (em->flags != 0) {
 325                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 326                 goto out;
 327         }
 328         /*
 329          * We don't test anything else for inline since it doesn't get set
 330          * unless we have a page for it to write into.  Maybe we should change
 331          * this?
 332          */
 333         offset = em->start + em->len;
 334         free_extent_map(em);
 335
 336         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 337         if (IS_ERR(em)) {
 338                 test_msg("Got an error when we shouldn't have\n");
 339                 goto out;
 340         }
 341         if (em->block_start != EXTENT_MAP_HOLE) {
 342                 test_msg("Expected a hole, got %llu\n", em->block_start);
 343                 goto out;
 344         }
 345         if (em->start != offset || em->len != 4) {
 346                 test_msg("Unexpected extent wanted start %llu len 4, got start "
 347                          "%llu len %llu\n", offset, em->start, em->len);
 348                 goto out;
 349         }
 350         if (em->flags != 0) {
 351                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 352                 goto out;
 353         }
 354         offset = em->start + em->len;
 355         free_extent_map(em);
 356
 357         /* Regular extent */
 358         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 359         if (IS_ERR(em)) {
 360                 test_msg("Got an error when we shouldn't have\n");
 361                 goto out;
 362         }
 363         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 364                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 365                 goto out;
 366         }
 367         if (em->start != offset || em->len != sectorsize - 1) {
 368                 test_msg("Unexpected extent wanted start %llu len 4095, got "
 369                          "start %llu len %llu\n", offset, em->start, em->len);
 370                 goto out;
 371         }
 372         if (em->flags != 0) {
 373                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 374                 goto out;
 375         }
 376         if (em->orig_start != em->start) {
 377                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 378                          em->orig_start);
 379                 goto out;
 380         }
 381         offset = em->start + em->len;
 382         free_extent_map(em);
 383
 384         /* The next 3 are split extents */
 385         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 386         if (IS_ERR(em)) {
 387                 test_msg("Got an error when we shouldn't have\n");
 388                 goto out;
 389         }
 390         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 391                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 392                 goto out;
 393         }
 394         if (em->start != offset || em->len != sectorsize) {
 395                 test_msg("Unexpected extent start %llu len %u, "
 396                         "got start %llu len %llu\n",
 397                         offset, sectorsize, em->start, em->len);
 398                 goto out;
 399         }
 400         if (em->flags != 0) {
 401                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 402                 goto out;
 403         }
 404         if (em->orig_start != em->start) {
 405                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 406                          em->orig_start);
 407                 goto out;
 408         }
 409         disk_bytenr = em->block_start;
 410         orig_start = em->start;
 411         offset = em->start + em->len;
 412         free_extent_map(em);
 413
 414         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 415         if (IS_ERR(em)) {
 416                 test_msg("Got an error when we shouldn't have\n");
 417                 goto out;
 418         }
 419         if (em->block_start != EXTENT_MAP_HOLE) {
 420                 test_msg("Expected a hole, got %llu\n", em->block_start);
 421                 goto out;
 422         }
 423         if (em->start != offset || em->len != sectorsize) {
 424                 test_msg("Unexpected extent wanted start %llu len %u, "
 425                         "got start %llu len %llu\n",
 426                         offset, sectorsize, em->start, em->len);
 427                 goto out;
 428         }
 429         if (em->flags != 0) {
 430                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 431                 goto out;
 432         }
 433         offset = em->start + em->len;
 434         free_extent_map(em);
 435
 436         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 437         if (IS_ERR(em)) {
 438                 test_msg("Got an error when we shouldn't have\n");
 439                 goto out;
 440         }
 441         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 442                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 443                 goto out;
 444         }
 445         if (em->start != offset || em->len != 2 * sectorsize) {
 446                 test_msg("Unexpected extent wanted start %llu len %u, "
 447                         "got start %llu len %llu\n",
 448                         offset, 2 * sectorsize, em->start, em->len);
 449                 goto out;
 450         }
 451         if (em->flags != 0) {
 452                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 453                 goto out;
 454         }
 455         if (em->orig_start != orig_start) {
 456                 test_msg("Wrong orig offset, want %llu, have %llu\n",
 457                          orig_start, em->orig_start);
 458                 goto out;
 459         }
 460         disk_bytenr += (em->start - orig_start);
 461         if (em->block_start != disk_bytenr) {
 462                 test_msg("Wrong block start, want %llu, have %llu\n",
 463                          disk_bytenr, em->block_start);
 464                 goto out;
 465         }
 466         offset = em->start + em->len;
 467         free_extent_map(em);
 468
 469         /* Prealloc extent */
 470         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 471         if (IS_ERR(em)) {
 472                 test_msg("Got an error when we shouldn't have\n");
 473                 goto out;
 474         }
 475         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 476                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 477                 goto out;
 478         }
 479         if (em->start != offset || em->len != sectorsize) {
 480                 test_msg("Unexpected extent wanted start %llu len %u, "
 481                         "got start %llu len %llu\n",
 482                         offset, sectorsize, em->start, em->len);
 483                 goto out;
 484         }
 485         if (em->flags != prealloc_only) {
 486                 test_msg("Unexpected flags set, want %lu have %lu\n",
 487                          prealloc_only, em->flags);
 488                 goto out;
 489         }
 490         if (em->orig_start != em->start) {
 491                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 492                          em->orig_start);
 493                 goto out;
 494         }
 495         offset = em->start + em->len;
 496         free_extent_map(em);
 497
 498         /* The next 3 are a half written prealloc extent */
 499         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 500         if (IS_ERR(em)) {
 501                 test_msg("Got an error when we shouldn't have\n");
 502                 goto out;
 503         }
 504         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 505                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 506                 goto out;
 507         }
 508         if (em->start != offset || em->len != sectorsize) {
 509                 test_msg("Unexpected extent wanted start %llu len %u, "
 510                         "got start %llu len %llu\n",
 511                         offset, sectorsize, em->start, em->len);
 512                 goto out;
 513         }
 514         if (em->flags != prealloc_only) {
 515                 test_msg("Unexpected flags set, want %lu have %lu\n",
 516                          prealloc_only, em->flags);
 517                 goto out;
 518         }
 519         if (em->orig_start != em->start) {
 520                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 521                          em->orig_start);
 522                 goto out;
 523         }
 524         disk_bytenr = em->block_start;
 525         orig_start = em->start;
 526         offset = em->start + em->len;
 527         free_extent_map(em);
 528
 529         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 530         if (IS_ERR(em)) {
 531                 test_msg("Got an error when we shouldn't have\n");
 532                 goto out;
 533         }
 534         if (em->block_start >= EXTENT_MAP_HOLE) {
 535                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 536                 goto out;
 537         }
 538         if (em->start != offset || em->len != sectorsize) {
 539                 test_msg("Unexpected extent wanted start %llu len %u, "
 540                         "got start %llu len %llu\n",
 541                         offset, sectorsize, em->start, em->len);
 542                 goto out;
 543         }
 544         if (em->flags != 0) {
 545                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 546                 goto out;
 547         }
 548         if (em->orig_start != orig_start) {
 549                 test_msg("Unexpected orig offset, wanted %llu, have %llu\n",
 550                          orig_start, em->orig_start);
 551                 goto out;
 552         }
 553         if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
 554                 test_msg("Unexpected block start, wanted %llu, have %llu\n",
 555                          disk_bytenr + (em->start - em->orig_start),
 556                          em->block_start);
 557                 goto out;
 558         }
 559         offset = em->start + em->len;
 560         free_extent_map(em);
 561
 562         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 563         if (IS_ERR(em)) {
 564                 test_msg("Got an error when we shouldn't have\n");
 565                 goto out;
 566         }
 567         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 568                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 569                 goto out;
 570         }
 571         if (em->start != offset || em->len != 2 * sectorsize) {
 572                 test_msg("Unexpected extent wanted start %llu len %u, "
 573                         "got start %llu len %llu\n",
 574                         offset, 2 * sectorsize, em->start, em->len);
 575                 goto out;
 576         }
 577         if (em->flags != prealloc_only) {
 578                 test_msg("Unexpected flags set, want %lu have %lu\n",
 579                          prealloc_only, em->flags);
 580                 goto out;
 581         }
 582         if (em->orig_start != orig_start) {
 583                 test_msg("Wrong orig offset, want %llu, have %llu\n", orig_start,
 584                          em->orig_start);
 585                 goto out;
 586         }
 587         if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
 588                 test_msg("Unexpected block start, wanted %llu, have %llu\n",
 589                          disk_bytenr + (em->start - em->orig_start),
 590                          em->block_start);
 591                 goto out;
 592         }
 593         offset = em->start + em->len;
 594         free_extent_map(em);
 595
 596         /* Now for the compressed extent */
 597         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 598         if (IS_ERR(em)) {
 599                 test_msg("Got an error when we shouldn't have\n");
 600                 goto out;
 601         }
 602         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 603                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 604                 goto out;
 605         }
 606         if (em->start != offset || em->len != 2 * sectorsize) {
 607                 test_msg("Unexpected extent wanted start %llu len %u,"
 608                         "got start %llu len %llu\n",
 609                         offset, 2 * sectorsize, em->start, em->len);
 610                 goto out;
 611         }
 612         if (em->flags != compressed_only) {
 613                 test_msg("Unexpected flags set, want %lu have %lu\n",
 614                          compressed_only, em->flags);
 615                 goto out;
 616         }
 617         if (em->orig_start != em->start) {
 618                 test_msg("Wrong orig offset, want %llu, have %llu\n",
 619                          em->start, em->orig_start);
 620                 goto out;
 621         }
 622         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 623                 test_msg("Unexpected compress type, wanted %d, got %d\n",
 624                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 625                 goto out;
 626         }
 627         offset = em->start + em->len;
 628         free_extent_map(em);
 629
 630         /* Split compressed extent */
 631         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 632         if (IS_ERR(em)) {
 633                 test_msg("Got an error when we shouldn't have\n");
 634                 goto out;
 635         }
 636         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 637                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 638                 goto out;
 639         }
 640         if (em->start != offset || em->len != sectorsize) {
 641                 test_msg("Unexpected extent wanted start %llu len %u,"
 642                         "got start %llu len %llu\n",
 643                         offset, sectorsize, em->start, em->len);
 644                 goto out;
 645         }
 646         if (em->flags != compressed_only) {
 647                 test_msg("Unexpected flags set, want %lu have %lu\n",
 648                          compressed_only, em->flags);
 649                 goto out;
 650         }
 651         if (em->orig_start != em->start) {
 652                 test_msg("Wrong orig offset, want %llu, have %llu\n",
 653                          em->start, em->orig_start);
 654                 goto out;
 655         }
 656         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 657                 test_msg("Unexpected compress type, wanted %d, got %d\n",
 658                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 659                 goto out;
 660         }
 661         disk_bytenr = em->block_start;
 662         orig_start = em->start;
 663         offset = em->start + em->len;
 664         free_extent_map(em);
 665
 666         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 667         if (IS_ERR(em)) {
 668                 test_msg("Got an error when we shouldn't have\n");
 669                 goto out;
 670         }
 671         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 672                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 673                 goto out;
 674         }
 675         if (em->start != offset || em->len != sectorsize) {
 676                 test_msg("Unexpected extent wanted start %llu len %u, "
 677                         "got start %llu len %llu\n",
 678                         offset, sectorsize, em->start, em->len);
 679                 goto out;
 680         }
 681         if (em->flags != 0) {
 682                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 683                 goto out;
 684         }
 685         if (em->orig_start != em->start) {
 686                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 687                          em->orig_start);
 688                 goto out;
 689         }
 690         offset = em->start + em->len;
 691         free_extent_map(em);
 692
 693         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 694         if (IS_ERR(em)) {
 695                 test_msg("Got an error when we shouldn't have\n");
 696                 goto out;
 697         }
 698         if (em->block_start != disk_bytenr) {
 699                 test_msg("Block start does not match, want %llu got %llu\n",
 700                          disk_bytenr, em->block_start);
 701                 goto out;
 702         }
 703         if (em->start != offset || em->len != 2 * sectorsize) {
 704                 test_msg("Unexpected extent wanted start %llu len %u, "
 705                         "got start %llu len %llu\n",
 706                         offset, 2 * sectorsize, em->start, em->len);
 707                 goto out;
 708         }
 709         if (em->flags != compressed_only) {
 710                 test_msg("Unexpected flags set, want %lu have %lu\n",
 711                          compressed_only, em->flags);
 712                 goto out;
 713         }
 714         if (em->orig_start != orig_start) {
 715                 test_msg("Wrong orig offset, want %llu, have %llu\n",
 716                          em->start, orig_start);
 717                 goto out;
 718         }
 719         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 720                 test_msg("Unexpected compress type, wanted %d, got %d\n",
 721                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 722                 goto out;
 723         }
 724         offset = em->start + em->len;
 725         free_extent_map(em);
 726
 727         /* A hole between regular extents but no hole extent */
 728         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset + 6,
 729                         sectorsize, 0);
 730         if (IS_ERR(em)) {
 731                 test_msg("Got an error when we shouldn't have\n");
 732                 goto out;
 733         }
 734         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 735                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 736                 goto out;
 737         }
 738         if (em->start != offset || em->len != sectorsize) {
 739                 test_msg("Unexpected extent wanted start %llu len %u, "
 740                         "got start %llu len %llu\n",
 741                         offset, sectorsize, em->start, em->len);
 742                 goto out;
 743         }
 744         if (em->flags != 0) {
 745                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 746                 goto out;
 747         }
 748         if (em->orig_start != em->start) {
 749                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 750                          em->orig_start);
 751                 goto out;
 752         }
 753         offset = em->start + em->len;
 754         free_extent_map(em);
 755
 756         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, SZ_4M, 0);
 757         if (IS_ERR(em)) {
 758                 test_msg("Got an error when we shouldn't have\n");
 759                 goto out;
 760         }
 761         if (em->block_start != EXTENT_MAP_HOLE) {
 762                 test_msg("Expected a hole extent, got %llu\n", em->block_start);
 763                 goto out;
 764         }
 765         /*
 766          * Currently we just return a length that we requested rather than the
 767          * length of the actual hole, if this changes we'll have to change this
 768          * test.
 769          */
 770         if (em->start != offset || em->len != 3 * sectorsize) {
 771                 test_msg("Unexpected extent wanted start %llu len %u, "
 772                         "got start %llu len %llu\n",
 773                         offset, 3 * sectorsize, em->start, em->len);
 774                 goto out;
 775         }
 776         if (em->flags != vacancy_only) {
 777                 test_msg("Unexpected flags set, want %lu have %lu\n",
 778                          vacancy_only, em->flags);
 779                 goto out;
 780         }
 781         if (em->orig_start != em->start) {
 782                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 783                          em->orig_start);
 784                 goto out;
 785         }
 786         offset = em->start + em->len;
 787         free_extent_map(em);
 788
 789         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 790         if (IS_ERR(em)) {
 791                 test_msg("Got an error when we shouldn't have\n");
 792                 goto out;
 793         }
 794         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 795                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 796                 goto out;
 797         }
 798         if (em->start != offset || em->len != sectorsize) {
 799                 test_msg("Unexpected extent wanted start %llu len %u,"
 800                         "got start %llu len %llu\n",
 801                         offset, sectorsize, em->start, em->len);
 802                 goto out;
 803         }
 804         if (em->flags != 0) {
 805                 test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
 806                 goto out;
 807         }
 808         if (em->orig_start != em->start) {
 809                 test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
 810                          em->orig_start);
 811                 goto out;
 812         }
 813         ret = 0;
 814 out:
 815         if (!IS_ERR(em))
 816                 free_extent_map(em);
 817         iput(inode);
 818         btrfs_free_dummy_root(root);
 819         btrfs_free_dummy_fs_info(fs_info);
 820         return ret;
 821 }
 822
 823 static int test_hole_first(u32 sectorsize, u32 nodesize)
 824 {
 825         struct btrfs_fs_info *fs_info = NULL;
 826         struct inode *inode = NULL;
 827         struct btrfs_root *root = NULL;
 828         struct extent_map *em = NULL;
 829         int ret = -ENOMEM;
 830
 831         inode = btrfs_new_test_inode();
 832         if (!inode) {
 833                 test_msg("Couldn't allocate inode\n");
 834                 return ret;
 835         }
 836
 837         BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
 838         BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
 839         BTRFS_I(inode)->location.offset = 0;
 840
 841         fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
 842         if (!fs_info) {
 843                 test_msg("Couldn't allocate dummy fs info\n");
 844                 goto out;
 845         }
 846
 847         root = btrfs_alloc_dummy_root(fs_info);
 848         if (IS_ERR(root)) {
 849                 test_msg("Couldn't allocate root\n");
 850                 goto out;
 851         }
 852
 853         root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
 854         if (!root->node) {
 855                 test_msg("Couldn't allocate dummy buffer\n");
 856                 goto out;
 857         }
 858
 859         extent_buffer_get(root->node);
 860         btrfs_set_header_nritems(root->node, 0);
 861         btrfs_set_header_level(root->node, 0);
 862         BTRFS_I(inode)->root = root;
 863         ret = -EINVAL;
 864
 865         /*
 866          * Need a blank inode item here just so we don't confuse
 867          * btrfs_get_extent.
 868          */
 869         insert_inode_item_key(root);
 870         insert_extent(root, sectorsize, sectorsize, sectorsize, 0, sectorsize,
 871                       sectorsize, BTRFS_FILE_EXTENT_REG, 0, 1);
 872         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, 0, 2 * sectorsize, 0);
 873         if (IS_ERR(em)) {
 874                 test_msg("Got an error when we shouldn't have\n");
 875                 goto out;
 876         }
 877         if (em->block_start != EXTENT_MAP_HOLE) {
 878                 test_msg("Expected a hole, got %llu\n", em->block_start);
 879                 goto out;
 880         }
 881         if (em->start != 0 || em->len != sectorsize) {
 882                 test_msg("Unexpected extent wanted start 0 len %u, "
 883                         "got start %llu len %llu\n",
 884                         sectorsize, em->start, em->len);
 885                 goto out;
 886         }
 887         if (em->flags != vacancy_only) {
 888                 test_msg("Wrong flags, wanted %lu, have %lu\n", vacancy_only,
 889                          em->flags);
 890                 goto out;
 891         }
 892         free_extent_map(em);
 893
 894         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, sectorsize,
 895                         2 * sectorsize, 0);
 896         if (IS_ERR(em)) {
 897                 test_msg("Got an error when we shouldn't have\n");
 898                 goto out;
 899         }
 900         if (em->block_start != sectorsize) {
 901                 test_msg("Expected a real extent, got %llu\n", em->block_start);
 902                 goto out;
 903         }
 904         if (em->start != sectorsize || em->len != sectorsize) {
 905                 test_msg("Unexpected extent wanted start %u len %u, "
 906                         "got start %llu len %llu\n",
 907                         sectorsize, sectorsize, em->start, em->len);
 908                 goto out;
 909         }
 910         if (em->flags != 0) {
 911                 test_msg("Unexpected flags set, wanted 0 got %lu\n",
 912                          em->flags);
 913                 goto out;
 914         }
 915         ret = 0;
 916 out:
 917         if (!IS_ERR(em))
 918                 free_extent_map(em);
 919         iput(inode);
 920         btrfs_free_dummy_root(root);
 921         btrfs_free_dummy_fs_info(fs_info);
 922         return ret;
 923 }
 924
 925 static int test_extent_accounting(u32 sectorsize, u32 nodesize)
 926 {
 927         struct btrfs_fs_info *fs_info = NULL;
 928         struct inode *inode = NULL;
 929         struct btrfs_root *root = NULL;
 930         int ret = -ENOMEM;
 931
 932         inode = btrfs_new_test_inode();
 933         if (!inode) {
 934                 test_msg("Couldn't allocate inode\n");
 935                 return ret;
 936         }
 937
 938         fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
 939         if (!fs_info) {
 940                 test_msg("Couldn't allocate dummy fs info\n");
 941                 goto out;
 942         }
 943
 944         root = btrfs_alloc_dummy_root(fs_info);
 945         if (IS_ERR(root)) {
 946                 test_msg("Couldn't allocate root\n");
 947                 goto out;
 948         }
 949
 950         BTRFS_I(inode)->root = root;
 951         btrfs_test_inode_set_ops(inode);
 952
 953         /* [BTRFS_MAX_EXTENT_SIZE] */
 954         ret = btrfs_set_extent_delalloc(inode, 0, BTRFS_MAX_EXTENT_SIZE - 1, 0,
 955                                         NULL, 0);
 956         if (ret) {
 957                 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
 958                 goto out;
 959         }
 960         if (BTRFS_I(inode)->outstanding_extents != 1) {
 961                 ret = -EINVAL;
 962                 test_msg("Miscount, wanted 1, got %u\n",
 963                          BTRFS_I(inode)->outstanding_extents);
 964                 goto out;
 965         }
 966
 967         /* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
 968         ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE,
 969                                         BTRFS_MAX_EXTENT_SIZE + sectorsize - 1,
 970                                         0, NULL, 0);
 971         if (ret) {
 972                 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
 973                 goto out;
 974         }
 975         if (BTRFS_I(inode)->outstanding_extents != 2) {
 976                 ret = -EINVAL;
 977                 test_msg("Miscount, wanted 2, got %u\n",
 978                          BTRFS_I(inode)->outstanding_extents);
 979                 goto out;
 980         }
 981
 982         /* [BTRFS_MAX_EXTENT_SIZE/2][sectorsize HOLE][the rest] */
 983         ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
 984                                BTRFS_MAX_EXTENT_SIZE >> 1,
 985                                (BTRFS_MAX_EXTENT_SIZE >> 1) + sectorsize - 1,
 986                                EXTENT_DELALLOC | EXTENT_DIRTY |
 987                                EXTENT_UPTODATE, 0, 0, NULL);
 988         if (ret) {
 989                 test_msg("clear_extent_bit returned %d\n", ret);
 990                 goto out;
 991         }
 992         if (BTRFS_I(inode)->outstanding_extents != 2) {
 993                 ret = -EINVAL;
 994                 test_msg("Miscount, wanted 2, got %u\n",
 995                          BTRFS_I(inode)->outstanding_extents);
 996                 goto out;
 997         }
 998
 999         /* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
1000         ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE >> 1,
1001                                         (BTRFS_MAX_EXTENT_SIZE >> 1)
1002                                         + sectorsize - 1,
1003                                         0, NULL, 0);
1004         if (ret) {
1005                 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
1006                 goto out;
1007         }
1008         if (BTRFS_I(inode)->outstanding_extents != 2) {
1009                 ret = -EINVAL;
1010                 test_msg("Miscount, wanted 2, got %u\n",
1011                          BTRFS_I(inode)->outstanding_extents);
1012                 goto out;
1013         }
1014
1015         /*
1016          * [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize HOLE][BTRFS_MAX_EXTENT_SIZE+sectorsize]
1017          */
1018         ret = btrfs_set_extent_delalloc(inode,
1019                         BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize,
1020                         (BTRFS_MAX_EXTENT_SIZE << 1) + 3 * sectorsize - 1,
1021                         0, NULL, 0);
1022         if (ret) {
1023                 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
1024                 goto out;
1025         }
1026         if (BTRFS_I(inode)->outstanding_extents != 4) {
1027                 ret = -EINVAL;
1028                 test_msg("Miscount, wanted 4, got %u\n",
1029                          BTRFS_I(inode)->outstanding_extents);
1030                 goto out;
1031         }
1032
1033         /*
1034         * [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize][BTRFS_MAX_EXTENT_SIZE+sectorsize]
1035         */
1036         ret = btrfs_set_extent_delalloc(inode,
1037                         BTRFS_MAX_EXTENT_SIZE + sectorsize,
1038                         BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, 0, NULL, 0);
1039         if (ret) {
1040                 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
1041                 goto out;
1042         }
1043         if (BTRFS_I(inode)->outstanding_extents != 3) {
1044                 ret = -EINVAL;
1045                 test_msg("Miscount, wanted 3, got %u\n",
1046                          BTRFS_I(inode)->outstanding_extents);
1047                 goto out;
1048         }
1049
1050         /* [BTRFS_MAX_EXTENT_SIZE+4k][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4k] */
1051         ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
1052                                BTRFS_MAX_EXTENT_SIZE + sectorsize,
1053                                BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1,
1054                                EXTENT_DIRTY | EXTENT_DELALLOC |
1055                                EXTENT_UPTODATE, 0, 0, NULL);
1056         if (ret) {
1057                 test_msg("clear_extent_bit returned %d\n", ret);
1058                 goto out;
1059         }
1060         if (BTRFS_I(inode)->outstanding_extents != 4) {
1061                 ret = -EINVAL;
1062                 test_msg("Miscount, wanted 4, got %u\n",
1063                          BTRFS_I(inode)->outstanding_extents);
1064                 goto out;
1065         }
1066
1067         /*
1068          * Refill the hole again just for good measure, because I thought it
1069          * might fail and I'd rather satisfy my paranoia at this point.
1070          */
1071         ret = btrfs_set_extent_delalloc(inode,
1072                         BTRFS_MAX_EXTENT_SIZE + sectorsize,
1073                         BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, 0, NULL, 0);
1074         if (ret) {
1075                 test_msg("btrfs_set_extent_delalloc returned %d\n", ret);
1076                 goto out;
1077         }
1078         if (BTRFS_I(inode)->outstanding_extents != 3) {
1079                 ret = -EINVAL;
1080                 test_msg("Miscount, wanted 3, got %u\n",
1081                          BTRFS_I(inode)->outstanding_extents);
1082                 goto out;
1083         }
1084
1085         /* Empty */
1086         ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
1087                                EXTENT_DIRTY | EXTENT_DELALLOC |
1088                                EXTENT_UPTODATE, 0, 0, NULL);
1089         if (ret) {
1090                 test_msg("clear_extent_bit returned %d\n", ret);
1091                 goto out;
1092         }
1093         if (BTRFS_I(inode)->outstanding_extents) {
1094                 ret = -EINVAL;
1095                 test_msg("Miscount, wanted 0, got %u\n",
1096                          BTRFS_I(inode)->outstanding_extents);
1097                 goto out;
1098         }
1099         ret = 0;
1100 out:
1101         if (ret)
1102                 clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
1103                                  EXTENT_DIRTY | EXTENT_DELALLOC |
1104                                  EXTENT_UPTODATE, 0, 0, NULL);
1105         iput(inode);
1106         btrfs_free_dummy_root(root);
1107         btrfs_free_dummy_fs_info(fs_info);
1108         return ret;
1109 }
1110
1111 int btrfs_test_inodes(u32 sectorsize, u32 nodesize)
1112 {
1113         int ret;
1114
1115         set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
1116         set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
1117
1118         test_msg("Running btrfs_get_extent tests\n");
1119         ret = test_btrfs_get_extent(sectorsize, nodesize);
1120         if (ret)
1121                 return ret;
1122         test_msg("Running hole first btrfs_get_extent test\n");
1123         ret = test_hole_first(sectorsize, nodesize);
1124         if (ret)
1125                 return ret;
1126         test_msg("Running outstanding_extents tests\n");
1127         return test_extent_accounting(sectorsize, nodesize);
1128 }