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_err("couldn't allocate inode");
 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_err("couldn't allocate dummy fs info");
 242                 goto out;
 243         }
 244
 245         root = btrfs_alloc_dummy_root(fs_info);
 246         if (IS_ERR(root)) {
 247                 test_err("couldn't allocate root");
 248                 goto out;
 249         }
 250
 251         root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
 252         if (!root->node) {
 253                 test_err("couldn't allocate dummy buffer");
 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_err("got an error when we shouldn't have");
 272                 goto out;
 273         }
 274         if (em->block_start != EXTENT_MAP_HOLE) {
 275                 test_err("expected a hole, got %llu", 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_err("got an error when we shouldn't have");
 291                 goto out;
 292         }
 293         if (em->block_start != EXTENT_MAP_HOLE) {
 294                 test_err("expected a hole, got %llu", em->block_start);
 295                 goto out;
 296         }
 297         if (em->start != 0 || em->len != 5) {
 298                 test_err(
 299                 "unexpected extent wanted start 0 len 5, got start %llu len %llu",
 300                         em->start, em->len);
 301                 goto out;
 302         }
 303         if (em->flags != 0) {
 304                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 305                 goto out;
 306         }
 307         offset = em->start + em->len;
 308         free_extent_map(em);
 309
 310         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 311         if (IS_ERR(em)) {
 312                 test_err("got an error when we shouldn't have");
 313                 goto out;
 314         }
 315         if (em->block_start != EXTENT_MAP_INLINE) {
 316                 test_err("expected an inline, got %llu", em->block_start);
 317                 goto out;
 318         }
 319
 320         if (em->start != offset || em->len != (sectorsize - 5)) {
 321                 test_err(
 322         "unexpected extent wanted start %llu len 1, got start %llu len %llu",
 323                         offset, em->start, em->len);
 324                 goto out;
 325         }
 326         if (em->flags != 0) {
 327                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 328                 goto out;
 329         }
 330         /*
 331          * We don't test anything else for inline since it doesn't get set
 332          * unless we have a page for it to write into.  Maybe we should change
 333          * this?
 334          */
 335         offset = em->start + em->len;
 336         free_extent_map(em);
 337
 338         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 339         if (IS_ERR(em)) {
 340                 test_err("got an error when we shouldn't have");
 341                 goto out;
 342         }
 343         if (em->block_start != EXTENT_MAP_HOLE) {
 344                 test_err("expected a hole, got %llu", em->block_start);
 345                 goto out;
 346         }
 347         if (em->start != offset || em->len != 4) {
 348                 test_err(
 349         "unexpected extent wanted start %llu len 4, got start %llu len %llu",
 350                         offset, em->start, em->len);
 351                 goto out;
 352         }
 353         if (em->flags != 0) {
 354                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 355                 goto out;
 356         }
 357         offset = em->start + em->len;
 358         free_extent_map(em);
 359
 360         /* Regular extent */
 361         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 362         if (IS_ERR(em)) {
 363                 test_err("got an error when we shouldn't have");
 364                 goto out;
 365         }
 366         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 367                 test_err("expected a real extent, got %llu", em->block_start);
 368                 goto out;
 369         }
 370         if (em->start != offset || em->len != sectorsize - 1) {
 371                 test_err(
 372         "unexpected extent wanted start %llu len 4095, got start %llu len %llu",
 373                         offset, em->start, em->len);
 374                 goto out;
 375         }
 376         if (em->flags != 0) {
 377                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 378                 goto out;
 379         }
 380         if (em->orig_start != em->start) {
 381                 test_err("wrong orig offset, want %llu, have %llu", em->start,
 382                          em->orig_start);
 383                 goto out;
 384         }
 385         offset = em->start + em->len;
 386         free_extent_map(em);
 387
 388         /* The next 3 are split extents */
 389         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 390         if (IS_ERR(em)) {
 391                 test_err("got an error when we shouldn't have");
 392                 goto out;
 393         }
 394         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 395                 test_err("expected a real extent, got %llu", em->block_start);
 396                 goto out;
 397         }
 398         if (em->start != offset || em->len != sectorsize) {
 399                 test_err(
 400                 "unexpected extent start %llu len %u, got start %llu len %llu",
 401                         offset, sectorsize, em->start, em->len);
 402                 goto out;
 403         }
 404         if (em->flags != 0) {
 405                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 406                 goto out;
 407         }
 408         if (em->orig_start != em->start) {
 409                 test_err("wrong orig offset, want %llu, have %llu", em->start,
 410                          em->orig_start);
 411                 goto out;
 412         }
 413         disk_bytenr = em->block_start;
 414         orig_start = em->start;
 415         offset = em->start + em->len;
 416         free_extent_map(em);
 417
 418         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 419         if (IS_ERR(em)) {
 420                 test_err("got an error when we shouldn't have");
 421                 goto out;
 422         }
 423         if (em->block_start != EXTENT_MAP_HOLE) {
 424                 test_err("expected a hole, got %llu", em->block_start);
 425                 goto out;
 426         }
 427         if (em->start != offset || em->len != sectorsize) {
 428                 test_err(
 429         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 430                         offset, sectorsize, em->start, em->len);
 431                 goto out;
 432         }
 433         if (em->flags != 0) {
 434                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 435                 goto out;
 436         }
 437         offset = em->start + em->len;
 438         free_extent_map(em);
 439
 440         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 441         if (IS_ERR(em)) {
 442                 test_err("got an error when we shouldn't have");
 443                 goto out;
 444         }
 445         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 446                 test_err("expected a real extent, got %llu", em->block_start);
 447                 goto out;
 448         }
 449         if (em->start != offset || em->len != 2 * sectorsize) {
 450                 test_err(
 451         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 452                         offset, 2 * sectorsize, em->start, em->len);
 453                 goto out;
 454         }
 455         if (em->flags != 0) {
 456                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 457                 goto out;
 458         }
 459         if (em->orig_start != orig_start) {
 460                 test_err("wrong orig offset, want %llu, have %llu",
 461                          orig_start, em->orig_start);
 462                 goto out;
 463         }
 464         disk_bytenr += (em->start - orig_start);
 465         if (em->block_start != disk_bytenr) {
 466                 test_err("wrong block start, want %llu, have %llu",
 467                          disk_bytenr, em->block_start);
 468                 goto out;
 469         }
 470         offset = em->start + em->len;
 471         free_extent_map(em);
 472
 473         /* Prealloc extent */
 474         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 475         if (IS_ERR(em)) {
 476                 test_err("got an error when we shouldn't have");
 477                 goto out;
 478         }
 479         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 480                 test_err("expected a real extent, got %llu", em->block_start);
 481                 goto out;
 482         }
 483         if (em->start != offset || em->len != sectorsize) {
 484                 test_err(
 485         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 486                         offset, sectorsize, em->start, em->len);
 487                 goto out;
 488         }
 489         if (em->flags != prealloc_only) {
 490                 test_err("unexpected flags set, want %lu have %lu",
 491                          prealloc_only, em->flags);
 492                 goto out;
 493         }
 494         if (em->orig_start != em->start) {
 495                 test_err("wrong orig offset, want %llu, have %llu", em->start,
 496                          em->orig_start);
 497                 goto out;
 498         }
 499         offset = em->start + em->len;
 500         free_extent_map(em);
 501
 502         /* The next 3 are a half written prealloc extent */
 503         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 504         if (IS_ERR(em)) {
 505                 test_err("got an error when we shouldn't have");
 506                 goto out;
 507         }
 508         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 509                 test_err("expected a real extent, got %llu", em->block_start);
 510                 goto out;
 511         }
 512         if (em->start != offset || em->len != sectorsize) {
 513                 test_err(
 514         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 515                         offset, sectorsize, em->start, em->len);
 516                 goto out;
 517         }
 518         if (em->flags != prealloc_only) {
 519                 test_err("unexpected flags set, want %lu have %lu",
 520                          prealloc_only, em->flags);
 521                 goto out;
 522         }
 523         if (em->orig_start != em->start) {
 524                 test_err("wrong orig offset, want %llu, have %llu", em->start,
 525                          em->orig_start);
 526                 goto out;
 527         }
 528         disk_bytenr = em->block_start;
 529         orig_start = em->start;
 530         offset = em->start + em->len;
 531         free_extent_map(em);
 532
 533         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 534         if (IS_ERR(em)) {
 535                 test_err("got an error when we shouldn't have");
 536                 goto out;
 537         }
 538         if (em->block_start >= EXTENT_MAP_HOLE) {
 539                 test_err("expected a real extent, got %llu", em->block_start);
 540                 goto out;
 541         }
 542         if (em->start != offset || em->len != sectorsize) {
 543                 test_err(
 544         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 545                         offset, sectorsize, em->start, em->len);
 546                 goto out;
 547         }
 548         if (em->flags != 0) {
 549                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 550                 goto out;
 551         }
 552         if (em->orig_start != orig_start) {
 553                 test_err("unexpected orig offset, wanted %llu, have %llu",
 554                          orig_start, em->orig_start);
 555                 goto out;
 556         }
 557         if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
 558                 test_err("unexpected block start, wanted %llu, have %llu",
 559                          disk_bytenr + (em->start - em->orig_start),
 560                          em->block_start);
 561                 goto out;
 562         }
 563         offset = em->start + em->len;
 564         free_extent_map(em);
 565
 566         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 567         if (IS_ERR(em)) {
 568                 test_err("got an error when we shouldn't have");
 569                 goto out;
 570         }
 571         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 572                 test_err("expected a real extent, got %llu", em->block_start);
 573                 goto out;
 574         }
 575         if (em->start != offset || em->len != 2 * sectorsize) {
 576                 test_err(
 577         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 578                         offset, 2 * sectorsize, em->start, em->len);
 579                 goto out;
 580         }
 581         if (em->flags != prealloc_only) {
 582                 test_err("unexpected flags set, want %lu have %lu",
 583                          prealloc_only, em->flags);
 584                 goto out;
 585         }
 586         if (em->orig_start != orig_start) {
 587                 test_err("wrong orig offset, want %llu, have %llu", orig_start,
 588                          em->orig_start);
 589                 goto out;
 590         }
 591         if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
 592                 test_err("unexpected block start, wanted %llu, have %llu",
 593                          disk_bytenr + (em->start - em->orig_start),
 594                          em->block_start);
 595                 goto out;
 596         }
 597         offset = em->start + em->len;
 598         free_extent_map(em);
 599
 600         /* Now for the compressed extent */
 601         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 602         if (IS_ERR(em)) {
 603                 test_err("got an error when we shouldn't have");
 604                 goto out;
 605         }
 606         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 607                 test_err("expected a real extent, got %llu", em->block_start);
 608                 goto out;
 609         }
 610         if (em->start != offset || em->len != 2 * sectorsize) {
 611                 test_err(
 612         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 613                         offset, 2 * sectorsize, em->start, em->len);
 614                 goto out;
 615         }
 616         if (em->flags != compressed_only) {
 617                 test_err("unexpected flags set, want %lu have %lu",
 618                          compressed_only, em->flags);
 619                 goto out;
 620         }
 621         if (em->orig_start != em->start) {
 622                 test_err("wrong orig offset, want %llu, have %llu",
 623                          em->start, em->orig_start);
 624                 goto out;
 625         }
 626         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 627                 test_err("unexpected compress type, wanted %d, got %d",
 628                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 629                 goto out;
 630         }
 631         offset = em->start + em->len;
 632         free_extent_map(em);
 633
 634         /* Split compressed extent */
 635         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 636         if (IS_ERR(em)) {
 637                 test_err("got an error when we shouldn't have");
 638                 goto out;
 639         }
 640         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 641                 test_err("expected a real extent, got %llu", em->block_start);
 642                 goto out;
 643         }
 644         if (em->start != offset || em->len != sectorsize) {
 645                 test_err(
 646         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 647                         offset, sectorsize, em->start, em->len);
 648                 goto out;
 649         }
 650         if (em->flags != compressed_only) {
 651                 test_err("unexpected flags set, want %lu have %lu",
 652                          compressed_only, em->flags);
 653                 goto out;
 654         }
 655         if (em->orig_start != em->start) {
 656                 test_err("wrong orig offset, want %llu, have %llu",
 657                          em->start, em->orig_start);
 658                 goto out;
 659         }
 660         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 661                 test_err("unexpected compress type, wanted %d, got %d",
 662                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 663                 goto out;
 664         }
 665         disk_bytenr = em->block_start;
 666         orig_start = em->start;
 667         offset = em->start + em->len;
 668         free_extent_map(em);
 669
 670         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 671         if (IS_ERR(em)) {
 672                 test_err("got an error when we shouldn't have");
 673                 goto out;
 674         }
 675         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 676                 test_err("expected a real extent, got %llu", em->block_start);
 677                 goto out;
 678         }
 679         if (em->start != offset || em->len != sectorsize) {
 680                 test_err(
 681         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 682                         offset, sectorsize, em->start, em->len);
 683                 goto out;
 684         }
 685         if (em->flags != 0) {
 686                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 687                 goto out;
 688         }
 689         if (em->orig_start != em->start) {
 690                 test_err("wrong orig offset, want %llu, have %llu", em->start,
 691                          em->orig_start);
 692                 goto out;
 693         }
 694         offset = em->start + em->len;
 695         free_extent_map(em);
 696
 697         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 698         if (IS_ERR(em)) {
 699                 test_err("got an error when we shouldn't have");
 700                 goto out;
 701         }
 702         if (em->block_start != disk_bytenr) {
 703                 test_err("block start does not match, want %llu got %llu",
 704                          disk_bytenr, em->block_start);
 705                 goto out;
 706         }
 707         if (em->start != offset || em->len != 2 * sectorsize) {
 708                 test_err(
 709         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 710                         offset, 2 * sectorsize, em->start, em->len);
 711                 goto out;
 712         }
 713         if (em->flags != compressed_only) {
 714                 test_err("unexpected flags set, want %lu have %lu",
 715                          compressed_only, em->flags);
 716                 goto out;
 717         }
 718         if (em->orig_start != orig_start) {
 719                 test_err("wrong orig offset, want %llu, have %llu",
 720                          em->start, orig_start);
 721                 goto out;
 722         }
 723         if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
 724                 test_err("unexpected compress type, wanted %d, got %d",
 725                          BTRFS_COMPRESS_ZLIB, em->compress_type);
 726                 goto out;
 727         }
 728         offset = em->start + em->len;
 729         free_extent_map(em);
 730
 731         /* A hole between regular extents but no hole extent */
 732         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset + 6,
 733                         sectorsize, 0);
 734         if (IS_ERR(em)) {
 735                 test_err("got an error when we shouldn't have");
 736                 goto out;
 737         }
 738         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 739                 test_err("expected a real extent, got %llu", em->block_start);
 740                 goto out;
 741         }
 742         if (em->start != offset || em->len != sectorsize) {
 743                 test_err(
 744         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 745                         offset, sectorsize, em->start, em->len);
 746                 goto out;
 747         }
 748         if (em->flags != 0) {
 749                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 750                 goto out;
 751         }
 752         if (em->orig_start != em->start) {
 753                 test_err("wrong orig offset, want %llu, have %llu", em->start,
 754                          em->orig_start);
 755                 goto out;
 756         }
 757         offset = em->start + em->len;
 758         free_extent_map(em);
 759
 760         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, SZ_4M, 0);
 761         if (IS_ERR(em)) {
 762                 test_err("got an error when we shouldn't have");
 763                 goto out;
 764         }
 765         if (em->block_start != EXTENT_MAP_HOLE) {
 766                 test_err("expected a hole extent, got %llu", em->block_start);
 767                 goto out;
 768         }
 769         /*
 770          * Currently we just return a length that we requested rather than the
 771          * length of the actual hole, if this changes we'll have to change this
 772          * test.
 773          */
 774         if (em->start != offset || em->len != 3 * sectorsize) {
 775                 test_err(
 776         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 777                         offset, 3 * sectorsize, em->start, em->len);
 778                 goto out;
 779         }
 780         if (em->flags != vacancy_only) {
 781                 test_err("unexpected flags set, want %lu have %lu",
 782                          vacancy_only, em->flags);
 783                 goto out;
 784         }
 785         if (em->orig_start != em->start) {
 786                 test_err("wrong orig offset, want %llu, have %llu", em->start,
 787                          em->orig_start);
 788                 goto out;
 789         }
 790         offset = em->start + em->len;
 791         free_extent_map(em);
 792
 793         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
 794         if (IS_ERR(em)) {
 795                 test_err("got an error when we shouldn't have");
 796                 goto out;
 797         }
 798         if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
 799                 test_err("expected a real extent, got %llu", em->block_start);
 800                 goto out;
 801         }
 802         if (em->start != offset || em->len != sectorsize) {
 803                 test_err(
 804         "unexpected extent wanted start %llu len %u, got start %llu len %llu",
 805                         offset, sectorsize, em->start, em->len);
 806                 goto out;
 807         }
 808         if (em->flags != 0) {
 809                 test_err("unexpected flags set, want 0 have %lu", em->flags);
 810                 goto out;
 811         }
 812         if (em->orig_start != em->start) {
 813                 test_err("wrong orig offset, want %llu, have %llu", em->start,
 814                          em->orig_start);
 815                 goto out;
 816         }
 817         ret = 0;
 818 out:
 819         if (!IS_ERR(em))
 820                 free_extent_map(em);
 821         iput(inode);
 822         btrfs_free_dummy_root(root);
 823         btrfs_free_dummy_fs_info(fs_info);
 824         return ret;
 825 }
 826
 827 static int test_hole_first(u32 sectorsize, u32 nodesize)
 828 {
 829         struct btrfs_fs_info *fs_info = NULL;
 830         struct inode *inode = NULL;
 831         struct btrfs_root *root = NULL;
 832         struct extent_map *em = NULL;
 833         int ret = -ENOMEM;
 834
 835         inode = btrfs_new_test_inode();
 836         if (!inode) {
 837                 test_err("couldn't allocate inode");
 838                 return ret;
 839         }
 840
 841         BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
 842         BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
 843         BTRFS_I(inode)->location.offset = 0;
 844
 845         fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
 846         if (!fs_info) {
 847                 test_err("couldn't allocate dummy fs info");
 848                 goto out;
 849         }
 850
 851         root = btrfs_alloc_dummy_root(fs_info);
 852         if (IS_ERR(root)) {
 853                 test_err("couldn't allocate root");
 854                 goto out;
 855         }
 856
 857         root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
 858         if (!root->node) {
 859                 test_err("couldn't allocate dummy buffer");
 860                 goto out;
 861         }
 862
 863         extent_buffer_get(root->node);
 864         btrfs_set_header_nritems(root->node, 0);
 865         btrfs_set_header_level(root->node, 0);
 866         BTRFS_I(inode)->root = root;
 867         ret = -EINVAL;
 868
 869         /*
 870          * Need a blank inode item here just so we don't confuse
 871          * btrfs_get_extent.
 872          */
 873         insert_inode_item_key(root);
 874         insert_extent(root, sectorsize, sectorsize, sectorsize, 0, sectorsize,
 875                       sectorsize, BTRFS_FILE_EXTENT_REG, 0, 1);
 876         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, 0, 2 * sectorsize, 0);
 877         if (IS_ERR(em)) {
 878                 test_err("got an error when we shouldn't have");
 879                 goto out;
 880         }
 881         if (em->block_start != EXTENT_MAP_HOLE) {
 882                 test_err("expected a hole, got %llu", em->block_start);
 883                 goto out;
 884         }
 885         if (em->start != 0 || em->len != sectorsize) {
 886                 test_err(
 887         "unexpected extent wanted start 0 len %u, got start %llu len %llu",
 888                         sectorsize, em->start, em->len);
 889                 goto out;
 890         }
 891         if (em->flags != vacancy_only) {
 892                 test_err("wrong flags, wanted %lu, have %lu", vacancy_only,
 893                          em->flags);
 894                 goto out;
 895         }
 896         free_extent_map(em);
 897
 898         em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, sectorsize,
 899                         2 * sectorsize, 0);
 900         if (IS_ERR(em)) {
 901                 test_err("got an error when we shouldn't have");
 902                 goto out;
 903         }
 904         if (em->block_start != sectorsize) {
 905                 test_err("expected a real extent, got %llu", em->block_start);
 906                 goto out;
 907         }
 908         if (em->start != sectorsize || em->len != sectorsize) {
 909                 test_err(
 910         "unexpected extent wanted start %u len %u, got start %llu len %llu",
 911                         sectorsize, sectorsize, em->start, em->len);
 912                 goto out;
 913         }
 914         if (em->flags != 0) {
 915                 test_err("unexpected flags set, wanted 0 got %lu",
 916                          em->flags);
 917                 goto out;
 918         }
 919         ret = 0;
 920 out:
 921         if (!IS_ERR(em))
 922                 free_extent_map(em);
 923         iput(inode);
 924         btrfs_free_dummy_root(root);
 925         btrfs_free_dummy_fs_info(fs_info);
 926         return ret;
 927 }
 928
 929 static int test_extent_accounting(u32 sectorsize, u32 nodesize)
 930 {
 931         struct btrfs_fs_info *fs_info = NULL;
 932         struct inode *inode = NULL;
 933         struct btrfs_root *root = NULL;
 934         int ret = -ENOMEM;
 935
 936         inode = btrfs_new_test_inode();
 937         if (!inode) {
 938                 test_err("couldn't allocate inode");
 939                 return ret;
 940         }
 941
 942         fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
 943         if (!fs_info) {
 944                 test_err("couldn't allocate dummy fs info");
 945                 goto out;
 946         }
 947
 948         root = btrfs_alloc_dummy_root(fs_info);
 949         if (IS_ERR(root)) {
 950                 test_err("couldn't allocate root");
 951                 goto out;
 952         }
 953
 954         BTRFS_I(inode)->root = root;
 955         btrfs_test_inode_set_ops(inode);
 956
 957         /* [BTRFS_MAX_EXTENT_SIZE] */
 958         ret = btrfs_set_extent_delalloc(inode, 0, BTRFS_MAX_EXTENT_SIZE - 1, 0,
 959                                         NULL, 0);
 960         if (ret) {
 961                 test_err("btrfs_set_extent_delalloc returned %d", ret);
 962                 goto out;
 963         }
 964         if (BTRFS_I(inode)->outstanding_extents != 1) {
 965                 ret = -EINVAL;
 966                 test_err("miscount, wanted 1, got %u",
 967                          BTRFS_I(inode)->outstanding_extents);
 968                 goto out;
 969         }
 970
 971         /* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
 972         ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE,
 973                                         BTRFS_MAX_EXTENT_SIZE + sectorsize - 1,
 974                                         0, NULL, 0);
 975         if (ret) {
 976                 test_err("btrfs_set_extent_delalloc returned %d", ret);
 977                 goto out;
 978         }
 979         if (BTRFS_I(inode)->outstanding_extents != 2) {
 980                 ret = -EINVAL;
 981                 test_err("miscount, wanted 2, got %u",
 982                          BTRFS_I(inode)->outstanding_extents);
 983                 goto out;
 984         }
 985
 986         /* [BTRFS_MAX_EXTENT_SIZE/2][sectorsize HOLE][the rest] */
 987         ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
 988                                BTRFS_MAX_EXTENT_SIZE >> 1,
 989                                (BTRFS_MAX_EXTENT_SIZE >> 1) + sectorsize - 1,
 990                                EXTENT_DELALLOC | EXTENT_DIRTY |
 991                                EXTENT_UPTODATE, 0, 0, NULL);
 992         if (ret) {
 993                 test_err("clear_extent_bit returned %d", ret);
 994                 goto out;
 995         }
 996         if (BTRFS_I(inode)->outstanding_extents != 2) {
 997                 ret = -EINVAL;
 998                 test_err("miscount, wanted 2, got %u",
 999                          BTRFS_I(inode)->outstanding_extents);
1000                 goto out;
1001         }
1002
1003         /* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
1004         ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE >> 1,
1005                                         (BTRFS_MAX_EXTENT_SIZE >> 1)
1006                                         + sectorsize - 1,
1007                                         0, NULL, 0);
1008         if (ret) {
1009                 test_err("btrfs_set_extent_delalloc returned %d", ret);
1010                 goto out;
1011         }
1012         if (BTRFS_I(inode)->outstanding_extents != 2) {
1013                 ret = -EINVAL;
1014                 test_err("miscount, wanted 2, got %u",
1015                          BTRFS_I(inode)->outstanding_extents);
1016                 goto out;
1017         }
1018
1019         /*
1020          * [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize HOLE][BTRFS_MAX_EXTENT_SIZE+sectorsize]
1021          */
1022         ret = btrfs_set_extent_delalloc(inode,
1023                         BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize,
1024                         (BTRFS_MAX_EXTENT_SIZE << 1) + 3 * sectorsize - 1,
1025                         0, NULL, 0);
1026         if (ret) {
1027                 test_err("btrfs_set_extent_delalloc returned %d", ret);
1028                 goto out;
1029         }
1030         if (BTRFS_I(inode)->outstanding_extents != 4) {
1031                 ret = -EINVAL;
1032                 test_err("miscount, wanted 4, got %u",
1033                          BTRFS_I(inode)->outstanding_extents);
1034                 goto out;
1035         }
1036
1037         /*
1038         * [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize][BTRFS_MAX_EXTENT_SIZE+sectorsize]
1039         */
1040         ret = btrfs_set_extent_delalloc(inode,
1041                         BTRFS_MAX_EXTENT_SIZE + sectorsize,
1042                         BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, 0, NULL, 0);
1043         if (ret) {
1044                 test_err("btrfs_set_extent_delalloc returned %d", ret);
1045                 goto out;
1046         }
1047         if (BTRFS_I(inode)->outstanding_extents != 3) {
1048                 ret = -EINVAL;
1049                 test_err("miscount, wanted 3, got %u",
1050                          BTRFS_I(inode)->outstanding_extents);
1051                 goto out;
1052         }
1053
1054         /* [BTRFS_MAX_EXTENT_SIZE+4k][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4k] */
1055         ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
1056                                BTRFS_MAX_EXTENT_SIZE + sectorsize,
1057                                BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1,
1058                                EXTENT_DIRTY | EXTENT_DELALLOC |
1059                                EXTENT_UPTODATE, 0, 0, NULL);
1060         if (ret) {
1061                 test_err("clear_extent_bit returned %d", ret);
1062                 goto out;
1063         }
1064         if (BTRFS_I(inode)->outstanding_extents != 4) {
1065                 ret = -EINVAL;
1066                 test_err("miscount, wanted 4, got %u",
1067                          BTRFS_I(inode)->outstanding_extents);
1068                 goto out;
1069         }
1070
1071         /*
1072          * Refill the hole again just for good measure, because I thought it
1073          * might fail and I'd rather satisfy my paranoia at this point.
1074          */
1075         ret = btrfs_set_extent_delalloc(inode,
1076                         BTRFS_MAX_EXTENT_SIZE + sectorsize,
1077                         BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, 0, NULL, 0);
1078         if (ret) {
1079                 test_err("btrfs_set_extent_delalloc returned %d", ret);
1080                 goto out;
1081         }
1082         if (BTRFS_I(inode)->outstanding_extents != 3) {
1083                 ret = -EINVAL;
1084                 test_err("miscount, wanted 3, got %u",
1085                          BTRFS_I(inode)->outstanding_extents);
1086                 goto out;
1087         }
1088
1089         /* Empty */
1090         ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
1091                                EXTENT_DIRTY | EXTENT_DELALLOC |
1092                                EXTENT_UPTODATE, 0, 0, NULL);
1093         if (ret) {
1094                 test_err("clear_extent_bit returned %d", ret);
1095                 goto out;
1096         }
1097         if (BTRFS_I(inode)->outstanding_extents) {
1098                 ret = -EINVAL;
1099                 test_err("miscount, wanted 0, got %u",
1100                          BTRFS_I(inode)->outstanding_extents);
1101                 goto out;
1102         }
1103         ret = 0;
1104 out:
1105         if (ret)
1106                 clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
1107                                  EXTENT_DIRTY | EXTENT_DELALLOC |
1108                                  EXTENT_UPTODATE, 0, 0, NULL);
1109         iput(inode);
1110         btrfs_free_dummy_root(root);
1111         btrfs_free_dummy_fs_info(fs_info);
1112         return ret;
1113 }
1114
1115 int btrfs_test_inodes(u32 sectorsize, u32 nodesize)
1116 {
1117         int ret;
1118
1119         set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
1120         set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
1121
1122         test_msg("running btrfs_get_extent tests");
1123         ret = test_btrfs_get_extent(sectorsize, nodesize);
1124         if (ret)
1125                 return ret;
1126         test_msg("running hole first btrfs_get_extent test");
1127         ret = test_hole_first(sectorsize, nodesize);
1128         if (ret)
1129                 return ret;
1130         test_msg("running outstanding_extents tests");
1131         return test_extent_accounting(sectorsize, nodesize);
1132 }