// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2013 Fusion IO.  All rights reserved.
 */

#include <linux/types.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../btrfs_inode.h"
#include "../disk-io.h"
#include "../extent_io.h"
#include "../volumes.h"
#include "../compression.h"
#include "../accessors.h"

static void insert_extent(struct btrfs_root *root, u64 start, u64 len,
                          u64 ram_bytes, u64 offset, u64 disk_bytenr,
                          u64 disk_len, u32 type, u8 compression, int slot)
{
        struct btrfs_path path;
        struct btrfs_file_extent_item *fi;
        struct extent_buffer *leaf = root->node;
        struct btrfs_key key;
        u32 value_len = sizeof(struct btrfs_file_extent_item);

        if (type == BTRFS_FILE_EXTENT_INLINE)
                value_len += len;
        memset(&path, 0, sizeof(path));

        path.nodes[0] = leaf;
        path.slots[0] = slot;

        key.objectid = BTRFS_FIRST_FREE_OBJECTID;
        key.type = BTRFS_EXTENT_DATA_KEY;
        key.offset = start;

        /*
         * Passing a NULL trans handle is fine here, we have a dummy root eb
         * and the tree is a single node (level 0).
         */
        btrfs_setup_item_for_insert(NULL, root, &path, &key, value_len);
        fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
        btrfs_set_file_extent_generation(leaf, fi, 1);
        btrfs_set_file_extent_type(leaf, fi, type);
        btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
        btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_len);
        btrfs_set_file_extent_offset(leaf, fi, offset);
        btrfs_set_file_extent_num_bytes(leaf, fi, len);
        btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
        btrfs_set_file_extent_compression(leaf, fi, compression);
        btrfs_set_file_extent_encryption(leaf, fi, 0);
        btrfs_set_file_extent_other_encoding(leaf, fi, 0);
}

static void insert_inode_item_key(struct btrfs_root *root)
{
        struct btrfs_path path;
        struct extent_buffer *leaf = root->node;
        struct btrfs_key key;
        u32 value_len = 0;

        memset(&path, 0, sizeof(path));

        path.nodes[0] = leaf;
        path.slots[0] = 0;

        key.objectid = BTRFS_INODE_ITEM_KEY;
        key.type = BTRFS_INODE_ITEM_KEY;
        key.offset = 0;

        /*
         * Passing a NULL trans handle is fine here, we have a dummy root eb
         * and the tree is a single node (level 0).
         */
        btrfs_setup_item_for_insert(NULL, root, &path, &key, value_len);
}

/*
 * Build the most complicated map of extents the earth has ever seen.  We want
 * this so we can test all of the corner cases of btrfs_get_extent.  Here is a
 * diagram of how the extents will look though this may not be possible we still
 * want to make sure everything acts normally (the last number is not inclusive)
 *
 * The numbers are using 4K fs block size as an example, the real test will scale
 * all the extent maps (except the inlined one) according to the block size.
 *
 * [ 0  - 6 ][ 6 - 4K       ][ 4K - 8K ][ 8K -  12K      ]
 * [ inline ][ implied hole ][ regular ][ regular1 split ]
 *
 * [ 12K - 16K ][ 16K - 24K      ][ 24K - 28K ][ 28K - 32K ][ 32K - 36K         ]
 * [ hole      ][ regular1 split ][ prealloc  ][ prealloc1 ][ prealloc1 written ]
 *
 * [ 36K - 44K ][ 44K - 52K  ][ 52K - 56K   ][ 56K - 60K ][ 60K - 68 K  ]
 * [ prealloc1 ][ compressed ][ compressed1 ][ regular   ][ compressed1 ]
 *
 * [ 68K - 72K ][ 72K - 84K          ][ 84K - 88K ]
 * [  regular  ][ hole but no extent ][ regular   ]
 */
static void setup_file_extents(struct btrfs_root *root, u32 sectorsize)
{
        int slot = 0;
        u64 disk_bytenr = SZ_1M;
        u64 offset = 0;

        /*
         * Start 0, length 6, inlined.
         *
         * Tree-checker has strict limits on inline extents that they can only
         * exist at file offset 0, thus we can only have one inline file extent
         * at most.
         */
        insert_extent(root, offset, 6, 6, 0, 0, 0, BTRFS_FILE_EXTENT_INLINE, 0,
                      slot);
        slot++;
        offset = sectorsize;

        /* Start 1 * blocksize, length 1 * blocksize, regular. */
        insert_extent(root, offset, sectorsize, sectorsize, 0,
                      disk_bytenr, sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
        slot++;

        /* We don't want the regular em merged with the next one. */
        disk_bytenr += 2 * sectorsize;
        offset += sectorsize;

        /*
         * Start 2 * blocksize, length 1 * blocksize, regular.
         *
         * Now for 3 extents that were split from a hole punch so we test
         * offsets properly.
         */
        insert_extent(root, offset, sectorsize, 4 * sectorsize, 0, disk_bytenr,
                      4 * sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
        slot++;
        offset += sectorsize;

        /* Start 3 * blocksize, length 1 * blocksize, regular, explicit hole. */
        insert_extent(root, offset, sectorsize, sectorsize, 0, 0, 0,
                      BTRFS_FILE_EXTENT_REG, 0, slot);
        slot++;
        offset += sectorsize;

        /* Start 4 * blocksize, length 2 * blocksize, regular. */
        insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
                      2 * sectorsize, disk_bytenr, 4 * sectorsize,
                      BTRFS_FILE_EXTENT_REG, 0, slot);
        slot++;
        offset += 2 * sectorsize;
        disk_bytenr += 4 * sectorsize;

        /* Start 6 * blocksize, length 1 * blocksize, preallocated. */
        insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
                sectorsize, BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
        slot++;
        offset += sectorsize;

        /*
         * We want to jack up disk_bytenr a little more so the em stuff doesn't
         * merge our records.
         */
        disk_bytenr += 2 * sectorsize;

        /*
         * Start 7 * blocksize, length 1 * blocksize, prealloc.
         *
         * Now for a partially written prealloc extent, basically the same as
         * the hole punch example above.  Ram_bytes never changes when you mark
         * extents written btw.
         */
        insert_extent(root, offset, sectorsize, 4 * sectorsize, 0, disk_bytenr,
                      4 * sectorsize, BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
        slot++;
        offset += sectorsize;

        /* Start 8 * blocksize, length 1 * blocksize, regular. */
        insert_extent(root, offset, sectorsize, 4 * sectorsize, sectorsize,
                      disk_bytenr, 4 * sectorsize, BTRFS_FILE_EXTENT_REG, 0,
                      slot);
        slot++;
        offset += sectorsize;

        /* Start 9 * blocksize, length 2 * blocksize, prealloc. */
        insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
                      2 * sectorsize, disk_bytenr, 4 * sectorsize,
                      BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
        slot++;
        offset += 2 * sectorsize;
        disk_bytenr += 4 * sectorsize;

        /* Start 11 * blocksize, length 2 * blocksize, regular. */
        insert_extent(root, offset, 2 * sectorsize, 2 * sectorsize, 0,
                      disk_bytenr, sectorsize, BTRFS_FILE_EXTENT_REG,
                      BTRFS_COMPRESS_ZLIB, slot);
        slot++;
        offset += 2 * sectorsize;
        /* No merges */
        disk_bytenr += 2 * sectorsize;

        /* Start 13 * blocksize, length 1 * blocksize, regular. */
        insert_extent(root, offset, sectorsize, 4 * sectorsize, 0, disk_bytenr,
                      sectorsize, BTRFS_FILE_EXTENT_REG,
                      BTRFS_COMPRESS_ZLIB, slot);
        slot++;
        offset += sectorsize;

        /* Start 14 * blocksize, length 1 * blocksize, regular. */
        insert_extent(root, offset, sectorsize, sectorsize, 0,
                      disk_bytenr + sectorsize, sectorsize,
                      BTRFS_FILE_EXTENT_REG, 0, slot);
        slot++;
        offset += sectorsize;

        /* Start 15 * blocksize, length 2 * blocksize, regular. */
        insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
                      2 * sectorsize, disk_bytenr, sectorsize,
                      BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
        slot++;
        offset += 2 * sectorsize;
        disk_bytenr += 2 * sectorsize;

        /* Start 17 * blocksize, length 1 * blocksize, regular. */
        insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
                      sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
        slot++;
        offset += 4 * sectorsize;
        disk_bytenr += sectorsize;

        /*
         * Start 18 * blocksize, length 3 * blocksize, implied hole (aka no
         * file extent item).
         *
         * Start 21 * blocksize, length 1 * blocksize, regular.
         */
        insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
                      sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
}

static u32 prealloc_only = 0;
static u32 compressed_only = 0;
static u32 vacancy_only = 0;

static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
{
        struct btrfs_fs_info *fs_info = NULL;
        struct inode *inode = NULL;
        struct btrfs_root *root = NULL;
        struct extent_map *em = NULL;
        u64 orig_start;
        u64 disk_bytenr;
        u64 offset;
        int ret = -ENOMEM;

        test_msg("running btrfs_get_extent tests");

        inode = btrfs_new_test_inode();
        if (!inode) {
                test_std_err(TEST_ALLOC_INODE);
                return ret;
        }

        fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
        if (!fs_info) {
                test_std_err(TEST_ALLOC_FS_INFO);
                goto out;
        }

        root = btrfs_alloc_dummy_root(fs_info);
        if (IS_ERR(root)) {
                test_std_err(TEST_ALLOC_ROOT);
                goto out;
        }

        root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
        if (!root->node) {
                test_std_err(TEST_ALLOC_ROOT);
                goto out;
        }

        btrfs_set_header_nritems(root->node, 0);
        btrfs_set_header_level(root->node, 0);
        ret = -EINVAL;

        /* First with no extents */
        BTRFS_I(inode)->root = root;
        em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, sectorsize);
        if (IS_ERR(em)) {
                em = NULL;
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr != EXTENT_MAP_HOLE) {
                test_err("expected a hole, got %llu", em->disk_bytenr);
                goto out;
        }
        btrfs_free_extent_map(em);
        btrfs_drop_extent_map_range(BTRFS_I(inode), 0, (u64)-1, false);

        /*
         * All of the magic numbers are based on the mapping setup in
         * setup_file_extents, so if you change anything there you need to
         * update the comment and update the expected values below.
         */
        setup_file_extents(root, sectorsize);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, (u64)-1);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr != EXTENT_MAP_INLINE) {
                test_err("expected an inline, got %llu", em->disk_bytenr);
                goto out;
        }

        /*
         * For inline extent, we always round up the em to sectorsize, as
         * they are either:
         *
         * a) a hidden hole
         *    The range will be zeroed at inline extent read time.
         *
         * b) a file extent with unaligned bytenr
         *    Tree checker will reject it.
         */
        if (em->start != 0 || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start 0 len %u, got start %llu len %llu",
                        sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        /*
         * We don't test anything else for inline since it doesn't get set
         * unless we have a page for it to write into.  Maybe we should change
         * this?
         */
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        /* Regular extent */
        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        /* The next 3 are split extents */
        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
                "unexpected extent start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        disk_bytenr = btrfs_extent_map_block_start(em);
        orig_start = em->start;
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr != EXTENT_MAP_HOLE) {
                test_err("expected a hole, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != 2 * sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, 2 * sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        if (em->start - em->offset != orig_start) {
                test_err("wrong offset, em->start=%llu em->offset=%llu orig_start=%llu",
                         em->start, em->offset, orig_start);
                goto out;
        }
        disk_bytenr += (em->start - orig_start);
        if (btrfs_extent_map_block_start(em) != disk_bytenr) {
                test_err("wrong block start, want %llu, have %llu",
                         disk_bytenr, btrfs_extent_map_block_start(em));
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        /* Prealloc extent */
        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != prealloc_only) {
                test_err("unexpected flags set, want %u have %u",
                         prealloc_only, em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        /* The next 3 are a half written prealloc extent */
        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != prealloc_only) {
                test_err("unexpected flags set, want %u have %u",
                         prealloc_only, em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        disk_bytenr = btrfs_extent_map_block_start(em);
        orig_start = em->start;
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_HOLE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        if (em->start - em->offset != orig_start) {
                test_err("unexpected offset, wanted %llu, have %llu",
                         em->start - orig_start, em->offset);
                goto out;
        }
        if (btrfs_extent_map_block_start(em) != disk_bytenr + em->offset) {
                test_err("unexpected block start, wanted %llu, have %llu",
                         disk_bytenr + em->offset, btrfs_extent_map_block_start(em));
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != 2 * sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, 2 * sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != prealloc_only) {
                test_err("unexpected flags set, want %u have %u",
                         prealloc_only, em->flags);
                goto out;
        }
        if (em->start - em->offset != orig_start) {
                test_err("wrong offset, em->start=%llu em->offset=%llu orig_start=%llu",
                         em->start, em->offset, orig_start);
                goto out;
        }
        if (btrfs_extent_map_block_start(em) != disk_bytenr + em->offset) {
                test_err("unexpected block start, wanted %llu, have %llu",
                         disk_bytenr + em->offset, btrfs_extent_map_block_start(em));
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        /* Now for the compressed extent */
        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != 2 * sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, 2 * sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != compressed_only) {
                test_err("unexpected flags set, want %u have %u",
                         compressed_only, em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        if (btrfs_extent_map_compression(em) != BTRFS_COMPRESS_ZLIB) {
                test_err("unexpected compress type, wanted %d, got %d",
                         BTRFS_COMPRESS_ZLIB, btrfs_extent_map_compression(em));
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        /* Split compressed extent */
        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != compressed_only) {
                test_err("unexpected flags set, want %u have %u",
                         compressed_only, em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        if (btrfs_extent_map_compression(em) != BTRFS_COMPRESS_ZLIB) {
                test_err("unexpected compress type, wanted %d, got %d",
                         BTRFS_COMPRESS_ZLIB, btrfs_extent_map_compression(em));
                goto out;
        }
        disk_bytenr = btrfs_extent_map_block_start(em);
        orig_start = em->start;
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (btrfs_extent_map_block_start(em) != disk_bytenr) {
                test_err("block start does not match, want %llu got %llu",
                         disk_bytenr, btrfs_extent_map_block_start(em));
                goto out;
        }
        if (em->start != offset || em->len != 2 * sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, 2 * sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != compressed_only) {
                test_err("unexpected flags set, want %u have %u",
                         compressed_only, em->flags);
                goto out;
        }
        if (em->start - em->offset != orig_start) {
                test_err("wrong offset, em->start=%llu em->offset=%llu orig_start=%llu",
                         em->start, em->offset, orig_start);
                goto out;
        }
        if (btrfs_extent_map_compression(em) != BTRFS_COMPRESS_ZLIB) {
                test_err("unexpected compress type, wanted %d, got %d",
                         BTRFS_COMPRESS_ZLIB, btrfs_extent_map_compression(em));
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        /* A hole between regular extents but no hole extent */
        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset + 6, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, SZ_4M);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr != EXTENT_MAP_HOLE) {
                test_err("expected a hole extent, got %llu", em->disk_bytenr);
                goto out;
        }
        /*
         * Currently we just return a length that we requested rather than the
         * length of the actual hole, if this changes we'll have to change this
         * test.
         */
        if (em->start != offset || em->len != 3 * sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, 3 * sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != vacancy_only) {
                test_err("unexpected flags set, want %u have %u",
                         vacancy_only, em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong offset, want 0, have %llu", em->offset);
                goto out;
        }
        offset = btrfs_extent_map_end(em);
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, offset, sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr >= EXTENT_MAP_LAST_BYTE) {
                test_err("expected a real extent, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != offset || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %llu len %u, got start %llu len %llu",
                        offset, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, want 0 have %u", em->flags);
                goto out;
        }
        if (em->offset != 0) {
                test_err("wrong orig offset, want 0, have %llu", em->offset);
                goto out;
        }
        ret = 0;
out:
        if (!IS_ERR(em))
                btrfs_free_extent_map(em);
        iput(inode);
        btrfs_free_dummy_root(root);
        btrfs_free_dummy_fs_info(fs_info);
        return ret;
}

static int test_hole_first(u32 sectorsize, u32 nodesize)
{
        struct btrfs_fs_info *fs_info = NULL;
        struct inode *inode = NULL;
        struct btrfs_root *root = NULL;
        struct extent_map *em = NULL;
        int ret = -ENOMEM;

        test_msg("running hole first btrfs_get_extent test");

        inode = btrfs_new_test_inode();
        if (!inode) {
                test_std_err(TEST_ALLOC_INODE);
                return ret;
        }

        fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
        if (!fs_info) {
                test_std_err(TEST_ALLOC_FS_INFO);
                goto out;
        }

        root = btrfs_alloc_dummy_root(fs_info);
        if (IS_ERR(root)) {
                test_std_err(TEST_ALLOC_ROOT);
                goto out;
        }

        root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
        if (!root->node) {
                test_std_err(TEST_ALLOC_ROOT);
                goto out;
        }

        btrfs_set_header_nritems(root->node, 0);
        btrfs_set_header_level(root->node, 0);
        BTRFS_I(inode)->root = root;
        ret = -EINVAL;

        /*
         * Need a blank inode item here just so we don't confuse
         * btrfs_get_extent.
         */
        insert_inode_item_key(root);
        insert_extent(root, sectorsize, sectorsize, sectorsize, 0, sectorsize,
                      sectorsize, BTRFS_FILE_EXTENT_REG, 0, 1);
        em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, 2 * sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (em->disk_bytenr != EXTENT_MAP_HOLE) {
                test_err("expected a hole, got %llu", em->disk_bytenr);
                goto out;
        }
        if (em->start != 0 || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start 0 len %u, got start %llu len %llu",
                        sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != vacancy_only) {
                test_err("wrong flags, wanted %u, have %u", vacancy_only,
                         em->flags);
                goto out;
        }
        btrfs_free_extent_map(em);

        em = btrfs_get_extent(BTRFS_I(inode), NULL, sectorsize, 2 * sectorsize);
        if (IS_ERR(em)) {
                test_err("got an error when we shouldn't have");
                goto out;
        }
        if (btrfs_extent_map_block_start(em) != sectorsize) {
                test_err("expected a real extent, got %llu",
                         btrfs_extent_map_block_start(em));
                goto out;
        }
        if (em->start != sectorsize || em->len != sectorsize) {
                test_err(
        "unexpected extent wanted start %u len %u, got start %llu len %llu",
                        sectorsize, sectorsize, em->start, em->len);
                goto out;
        }
        if (em->flags != 0) {
                test_err("unexpected flags set, wanted 0 got %u",
                         em->flags);
                goto out;
        }
        ret = 0;
out:
        if (!IS_ERR(em))
                btrfs_free_extent_map(em);
        iput(inode);
        btrfs_free_dummy_root(root);
        btrfs_free_dummy_fs_info(fs_info);
        return ret;
}

static int test_extent_accounting(u32 sectorsize, u32 nodesize)
{
        struct btrfs_fs_info *fs_info = NULL;
        struct inode *inode = NULL;
        struct btrfs_root *root = NULL;
        int ret = -ENOMEM;

        test_msg("running outstanding_extents tests");

        inode = btrfs_new_test_inode();
        if (!inode) {
                test_std_err(TEST_ALLOC_INODE);
                return ret;
        }

        fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
        if (!fs_info) {
                test_std_err(TEST_ALLOC_FS_INFO);
                goto out;
        }

        root = btrfs_alloc_dummy_root(fs_info);
        if (IS_ERR(root)) {
                test_std_err(TEST_ALLOC_ROOT);
                goto out;
        }

        BTRFS_I(inode)->root = root;

        /* [BTRFS_MAX_EXTENT_SIZE] */
        ret = btrfs_set_extent_delalloc(BTRFS_I(inode), 0,
                                        BTRFS_MAX_EXTENT_SIZE - 1, 0, NULL);
        if (ret) {
                test_err("btrfs_set_extent_delalloc returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents != 1) {
                ret = -EINVAL;
                test_err("miscount, wanted 1, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }

        /* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
        ret = btrfs_set_extent_delalloc(BTRFS_I(inode), BTRFS_MAX_EXTENT_SIZE,
                                        BTRFS_MAX_EXTENT_SIZE + sectorsize - 1,
                                        0, NULL);
        if (ret) {
                test_err("btrfs_set_extent_delalloc returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents != 2) {
                ret = -EINVAL;
                test_err("miscount, wanted 2, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }

        /* [BTRFS_MAX_EXTENT_SIZE/2][sectorsize HOLE][the rest] */
        ret = btrfs_clear_extent_bit(&BTRFS_I(inode)->io_tree,
                                     BTRFS_MAX_EXTENT_SIZE >> 1,
                                     (BTRFS_MAX_EXTENT_SIZE >> 1) + sectorsize - 1,
                                     EXTENT_DELALLOC | EXTENT_DELALLOC_NEW, NULL);
        if (ret) {
                test_err("clear_extent_bit returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents != 2) {
                ret = -EINVAL;
                test_err("miscount, wanted 2, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }

        /* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
        ret = btrfs_set_extent_delalloc(BTRFS_I(inode), BTRFS_MAX_EXTENT_SIZE >> 1,
                                        (BTRFS_MAX_EXTENT_SIZE >> 1)
                                        + sectorsize - 1,
                                        0, NULL);
        if (ret) {
                test_err("btrfs_set_extent_delalloc returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents != 2) {
                ret = -EINVAL;
                test_err("miscount, wanted 2, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }

        /*
         * [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize HOLE][BTRFS_MAX_EXTENT_SIZE+sectorsize]
         */
        ret = btrfs_set_extent_delalloc(BTRFS_I(inode),
                        BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize,
                        (BTRFS_MAX_EXTENT_SIZE << 1) + 3 * sectorsize - 1,
                        0, NULL);
        if (ret) {
                test_err("btrfs_set_extent_delalloc returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents != 4) {
                ret = -EINVAL;
                test_err("miscount, wanted 4, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }

        /*
        * [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize][BTRFS_MAX_EXTENT_SIZE+sectorsize]
        */
        ret = btrfs_set_extent_delalloc(BTRFS_I(inode),
                        BTRFS_MAX_EXTENT_SIZE + sectorsize,
                        BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, 0, NULL);
        if (ret) {
                test_err("btrfs_set_extent_delalloc returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents != 3) {
                ret = -EINVAL;
                test_err("miscount, wanted 3, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }

        /* [BTRFS_MAX_EXTENT_SIZE+4k][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4k] */
        ret = btrfs_clear_extent_bit(&BTRFS_I(inode)->io_tree,
                                     BTRFS_MAX_EXTENT_SIZE + sectorsize,
                                     BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1,
                                     EXTENT_DELALLOC | EXTENT_DELALLOC_NEW, NULL);
        if (ret) {
                test_err("clear_extent_bit returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents != 4) {
                ret = -EINVAL;
                test_err("miscount, wanted 4, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }

        /*
         * Refill the hole again just for good measure, because I thought it
         * might fail and I'd rather satisfy my paranoia at this point.
         */
        ret = btrfs_set_extent_delalloc(BTRFS_I(inode),
                        BTRFS_MAX_EXTENT_SIZE + sectorsize,
                        BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, 0, NULL);
        if (ret) {
                test_err("btrfs_set_extent_delalloc returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents != 3) {
                ret = -EINVAL;
                test_err("miscount, wanted 3, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }

        /* Empty */
        ret = btrfs_clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
                                     EXTENT_DELALLOC | EXTENT_DELALLOC_NEW, NULL);
        if (ret) {
                test_err("clear_extent_bit returned %d", ret);
                goto out;
        }
        if (BTRFS_I(inode)->outstanding_extents) {
                ret = -EINVAL;
                test_err("miscount, wanted 0, got %u",
                         BTRFS_I(inode)->outstanding_extents);
                goto out;
        }
        ret = 0;
out:
        if (ret)
                btrfs_clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
                                       EXTENT_DELALLOC | EXTENT_DELALLOC_NEW, NULL);
        iput(inode);
        btrfs_free_dummy_root(root);
        btrfs_free_dummy_fs_info(fs_info);
        return ret;
}

int btrfs_test_inodes(u32 sectorsize, u32 nodesize)
{
        int ret;

        test_msg("running inode tests");

        compressed_only |= EXTENT_FLAG_COMPRESS_ZLIB;
        prealloc_only |= EXTENT_FLAG_PREALLOC;

        ret = test_btrfs_get_extent(sectorsize, nodesize);
        if (ret)
                return ret;
        ret = test_hole_first(sectorsize, nodesize);
        if (ret)
                return ret;
        return test_extent_accounting(sectorsize, nodesize);
}