littlefs/tests/test_superblocks.toml

# simple formatting test
[cases.test_superblocks_format]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;
'''

# mount/unmount
[cases.test_superblocks_mount]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;
    lfs_mount(&lfs, cfg) => 0;
    lfs_unmount(&lfs) => 0;
'''

# make sure the magic string "littlefs" is always at offset=8
[cases.test_superblocks_magic]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;

    // check our magic string
    //
    // note if we lose power we may not have the magic string in both blocks!
    // but we don't lose power in this test so we can assert the magic string
    // is present in both
    uint8_t magic[lfs_max(16, READ_SIZE)];
    cfg->read(cfg, 0, 0, magic, lfs_max(16, READ_SIZE)) => 0;
    assert(memcmp(&magic[8], "littlefs", 8) == 0);
    cfg->read(cfg, 1, 0, magic, lfs_max(16, READ_SIZE)) => 0;
    assert(memcmp(&magic[8], "littlefs", 8) == 0);
'''

# mount/unmount from interpretting a previous superblock block_count
[cases.test_superblocks_mount_unknown_block_count]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;

    memset(&lfs, 0, sizeof(lfs));
    struct lfs_config tweaked_cfg = *cfg;
    tweaked_cfg.block_count = 0;
    lfs_mount(&lfs, &tweaked_cfg) => 0;
    assert(lfs.block_count == cfg->block_count);
    lfs_unmount(&lfs) => 0;
'''

# reentrant format
[cases.test_superblocks_reentrant_format]
reentrant = true
defines.POWERLOSS_BEHAVIOR = [
    'LFS_EMUBD_POWERLOSS_NOOP',
    'LFS_EMUBD_POWERLOSS_OOO',
]
code = '''
    lfs_t lfs;
    int err = lfs_mount(&lfs, cfg);
    if (err) {
        lfs_format(&lfs, cfg) => 0;
        lfs_mount(&lfs, cfg) => 0;
    }
    lfs_unmount(&lfs) => 0;
'''

# invalid mount
[cases.test_superblocks_invalid_mount]
code = '''
    lfs_t lfs;
    lfs_mount(&lfs, cfg) => LFS_ERR_CORRUPT;
'''

# test we can read superblock info through lfs_fs_stat
[cases.test_superblocks_stat]
if = 'DISK_VERSION == 0'
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;

    // test we can mount and read fsinfo
    lfs_mount(&lfs, cfg) => 0;

    struct lfs_fsinfo fsinfo;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.disk_version == LFS_DISK_VERSION);
    assert(fsinfo.name_max == LFS_NAME_MAX);
    assert(fsinfo.file_max == LFS_FILE_MAX);
    assert(fsinfo.attr_max == LFS_ATTR_MAX);

    lfs_unmount(&lfs) => 0;
'''

[cases.test_superblocks_stat_tweaked]
if = 'DISK_VERSION == 0'
defines.TWEAKED_NAME_MAX = 63
defines.TWEAKED_FILE_MAX = '(1 << 16)-1'
defines.TWEAKED_ATTR_MAX = 512
code = '''
    // create filesystem with tweaked params
    struct lfs_config tweaked_cfg = *cfg;
    tweaked_cfg.name_max = TWEAKED_NAME_MAX;
    tweaked_cfg.file_max = TWEAKED_FILE_MAX;
    tweaked_cfg.attr_max = TWEAKED_ATTR_MAX;

    lfs_t lfs;
    lfs_format(&lfs, &tweaked_cfg) => 0;

    // test we can mount and read these params with the original config
    lfs_mount(&lfs, cfg) => 0;

    struct lfs_fsinfo fsinfo;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.disk_version == LFS_DISK_VERSION);
    assert(fsinfo.name_max == TWEAKED_NAME_MAX);
    assert(fsinfo.file_max == TWEAKED_FILE_MAX);
    assert(fsinfo.attr_max == TWEAKED_ATTR_MAX);

    lfs_unmount(&lfs) => 0;
'''

# expanding superblock
[cases.test_superblocks_expand]
defines.BLOCK_CYCLES = [32, 33, 1]
defines.N = [10, 100, 1000]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;
    lfs_mount(&lfs, cfg) => 0;
    for (int i = 0; i < N; i++) {
        lfs_file_t file;
        lfs_file_open(&lfs, &file, "dummy",
                LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
        lfs_file_close(&lfs, &file) => 0;
        struct lfs_info info;
        lfs_stat(&lfs, "dummy", &info) => 0;
        assert(strcmp(info.name, "dummy") == 0);
        assert(info.type == LFS_TYPE_REG);
        lfs_remove(&lfs, "dummy") => 0;
    }
    lfs_unmount(&lfs) => 0;

    // one last check after power-cycle
    lfs_mount(&lfs, cfg) => 0;
    lfs_file_t file;
    lfs_file_open(&lfs, &file, "dummy",
            LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
    lfs_file_close(&lfs, &file) => 0;
    struct lfs_info info;
    lfs_stat(&lfs, "dummy", &info) => 0;
    assert(strcmp(info.name, "dummy") == 0);
    assert(info.type == LFS_TYPE_REG);
    lfs_unmount(&lfs) => 0;
'''

# make sure the magic string "littlefs" is always at offset=8
[cases.test_superblocks_magic_expand]
defines.BLOCK_CYCLES = [32, 33, 1]
defines.N = [10, 100, 1000]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;
    lfs_mount(&lfs, cfg) => 0;
    for (int i = 0; i < N; i++) {
        lfs_file_t file;
        lfs_file_open(&lfs, &file, "dummy",
                LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
        lfs_file_close(&lfs, &file) => 0;
        struct lfs_info info;
        lfs_stat(&lfs, "dummy", &info) => 0;
        assert(strcmp(info.name, "dummy") == 0);
        assert(info.type == LFS_TYPE_REG);
        lfs_remove(&lfs, "dummy") => 0;
    }
    lfs_unmount(&lfs) => 0;

    // check our magic string
    //
    // note if we lose power we may not have the magic string in both blocks!
    // but we don't lose power in this test so we can assert the magic string
    // is present in both
    uint8_t magic[lfs_max(16, READ_SIZE)];
    cfg->read(cfg, 0, 0, magic, lfs_max(16, READ_SIZE)) => 0;
    assert(memcmp(&magic[8], "littlefs", 8) == 0);
    cfg->read(cfg, 1, 0, magic, lfs_max(16, READ_SIZE)) => 0;
    assert(memcmp(&magic[8], "littlefs", 8) == 0);
'''

# expanding superblock with power cycle
[cases.test_superblocks_expand_power_cycle]
defines.BLOCK_CYCLES = [32, 33, 1]
defines.N = [10, 100, 1000]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;
    for (int i = 0; i < N; i++) {
        lfs_mount(&lfs, cfg) => 0;
        // remove lingering dummy?
        struct lfs_info info;
        int err = lfs_stat(&lfs, "dummy", &info);
        assert(err == 0 || (err == LFS_ERR_NOENT && i == 0));
        if (!err) {
            assert(strcmp(info.name, "dummy") == 0);
            assert(info.type == LFS_TYPE_REG);
            lfs_remove(&lfs, "dummy") => 0;
        }

        lfs_file_t file;
        lfs_file_open(&lfs, &file, "dummy",
                LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
        lfs_file_close(&lfs, &file) => 0;
        lfs_stat(&lfs, "dummy", &info) => 0;
        assert(strcmp(info.name, "dummy") == 0);
        assert(info.type == LFS_TYPE_REG);
        lfs_unmount(&lfs) => 0;
    }

    // one last check after power-cycle
    lfs_mount(&lfs, cfg) => 0;
    struct lfs_info info;
    lfs_stat(&lfs, "dummy", &info) => 0;
    assert(strcmp(info.name, "dummy") == 0);
    assert(info.type == LFS_TYPE_REG);
    lfs_unmount(&lfs) => 0;
'''

# reentrant expanding superblock
[cases.test_superblocks_reentrant_expand]
defines.BLOCK_CYCLES = [2, 1]
defines.N = 24
reentrant = true
defines.POWERLOSS_BEHAVIOR = [
    'LFS_EMUBD_POWERLOSS_NOOP',
    'LFS_EMUBD_POWERLOSS_OOO',
]
code = '''
    lfs_t lfs;
    int err = lfs_mount(&lfs, cfg);
    if (err) {
        lfs_format(&lfs, cfg) => 0;
        lfs_mount(&lfs, cfg) => 0;
    }

    for (int i = 0; i < N; i++) {
        // remove lingering dummy?
        struct lfs_info info;
        err = lfs_stat(&lfs, "dummy", &info);
        assert(err == 0 || (err == LFS_ERR_NOENT && i == 0));
        if (!err) {
            assert(strcmp(info.name, "dummy") == 0);
            assert(info.type == LFS_TYPE_REG);
            lfs_remove(&lfs, "dummy") => 0;
        }

        lfs_file_t file;
        lfs_file_open(&lfs, &file, "dummy",
                LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
        lfs_file_close(&lfs, &file) => 0;
        lfs_stat(&lfs, "dummy", &info) => 0;
        assert(strcmp(info.name, "dummy") == 0);
        assert(info.type == LFS_TYPE_REG);
    }

    lfs_unmount(&lfs) => 0;

    // one last check after power-cycle
    lfs_mount(&lfs, cfg) => 0;
    struct lfs_info info;
    lfs_stat(&lfs, "dummy", &info) => 0;
    assert(strcmp(info.name, "dummy") == 0);
    assert(info.type == LFS_TYPE_REG);
    lfs_unmount(&lfs) => 0;
'''


# mount with unknown block_count
[cases.test_superblocks_unknown_blocks]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;

    // known block_size/block_count
    cfg->block_size = BLOCK_SIZE;
    cfg->block_count = BLOCK_COUNT;
    lfs_mount(&lfs, cfg) => 0;
    struct lfs_fsinfo fsinfo;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    // unknown block_count
    cfg->block_size = BLOCK_SIZE;
    cfg->block_count = 0;
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    // do some work
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_file_t file;
    lfs_file_open(&lfs, &file, "test",
            LFS_O_CREAT | LFS_O_EXCL | LFS_O_WRONLY) => 0;
    lfs_file_write(&lfs, &file, "hello!", 6) => 6;
    lfs_file_close(&lfs, &file) => 0;
    lfs_unmount(&lfs) => 0;

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_file_open(&lfs, &file, "test", LFS_O_RDONLY) => 0;
    uint8_t buffer[256];
    lfs_file_read(&lfs, &file, buffer, sizeof(buffer)) => 6;
    lfs_file_close(&lfs, &file) => 0;
    assert(memcmp(buffer, "hello!", 6) == 0);
    lfs_unmount(&lfs) => 0;
'''

# mount with blocks fewer than the erase_count
[cases.test_superblocks_fewer_blocks]
defines.BLOCK_COUNT = ['ERASE_COUNT/2', 'ERASE_COUNT/4', '2']
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;

    // known block_size/block_count
    cfg->block_size = BLOCK_SIZE;
    cfg->block_count = BLOCK_COUNT;
    lfs_mount(&lfs, cfg) => 0;
    struct lfs_fsinfo fsinfo;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    // incorrect block_count
    cfg->block_size = BLOCK_SIZE;
    cfg->block_count = ERASE_COUNT;
    lfs_mount(&lfs, cfg) => LFS_ERR_INVAL;

    // unknown block_count
    cfg->block_size = BLOCK_SIZE;
    cfg->block_count = 0;
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    // do some work
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_file_t file;
    lfs_file_open(&lfs, &file, "test",
            LFS_O_CREAT | LFS_O_EXCL | LFS_O_WRONLY) => 0;
    lfs_file_write(&lfs, &file, "hello!", 6) => 6;
    lfs_file_close(&lfs, &file) => 0;
    lfs_unmount(&lfs) => 0;

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_file_open(&lfs, &file, "test", LFS_O_RDONLY) => 0;
    uint8_t buffer[256];
    lfs_file_read(&lfs, &file, buffer, sizeof(buffer)) => 6;
    lfs_file_close(&lfs, &file) => 0;
    assert(memcmp(buffer, "hello!", 6) == 0);
    lfs_unmount(&lfs) => 0;
'''

# mount with more blocks than the erase_count
[cases.test_superblocks_more_blocks]
defines.FORMAT_BLOCK_COUNT = '2*ERASE_COUNT'
in = 'lfs.c'
code = '''
    lfs_t lfs;
    lfs_init(&lfs, cfg) => 0;
    lfs.block_count = BLOCK_COUNT;

    lfs_mdir_t root = {
        .pair = {0, 0}, // make sure this goes into block 0
        .rev = 0,
        .off = sizeof(uint32_t),
        .etag = 0xffffffff,
        .count = 0,
        .tail = {LFS_BLOCK_NULL, LFS_BLOCK_NULL},
        .erased = false,
        .split = false,
    };

    lfs_superblock_t superblock = {
        .version     = LFS_DISK_VERSION,
        .block_size  = BLOCK_SIZE,
        .block_count = FORMAT_BLOCK_COUNT,
        .name_max    = LFS_NAME_MAX,
        .file_max    = LFS_FILE_MAX,
        .attr_max    = LFS_ATTR_MAX,
    };

    lfs_superblock_tole32(&superblock);
    lfs_dir_commit(&lfs, &root, LFS_MKATTRS(
            {LFS_MKTAG(LFS_TYPE_CREATE, 0, 0), NULL},
            {LFS_MKTAG(LFS_TYPE_SUPERBLOCK, 0, 8), "littlefs"},
            {LFS_MKTAG(LFS_TYPE_INLINESTRUCT, 0, sizeof(superblock)),
                &superblock})) => 0;
    lfs_deinit(&lfs) => 0;

    // known block_size/block_count
    cfg->block_size = BLOCK_SIZE;
    cfg->block_count = BLOCK_COUNT;
    lfs_mount(&lfs, cfg) => LFS_ERR_INVAL;
'''

# mount and grow the filesystem
[cases.test_superblocks_grow]
defines.BLOCK_COUNT = ['ERASE_COUNT/2', 'ERASE_COUNT/4', '2']
defines.BLOCK_COUNT_2 = 'ERASE_COUNT'
defines.KNOWN_BLOCK_COUNT = [true, false]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;

    if (KNOWN_BLOCK_COUNT) {
        cfg->block_count = BLOCK_COUNT;
    } else {
        cfg->block_count = 0;
    }

    // mount with block_size < erase_size
    lfs_mount(&lfs, cfg) => 0;
    struct lfs_fsinfo fsinfo;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    // same size is a noop
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_grow(&lfs, BLOCK_COUNT) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    // grow to new size
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_grow(&lfs, BLOCK_COUNT_2) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_unmount(&lfs) => 0;

    if (KNOWN_BLOCK_COUNT) {
        cfg->block_count = BLOCK_COUNT_2;
    } else {
        cfg->block_count = 0;
    }

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_unmount(&lfs) => 0;

    // mounting with the previous size should fail
    cfg->block_count = BLOCK_COUNT;
    lfs_mount(&lfs, cfg) => LFS_ERR_INVAL;

    if (KNOWN_BLOCK_COUNT) {
        cfg->block_count = BLOCK_COUNT_2;
    } else {
        cfg->block_count = 0;
    }

    // same size is a noop
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_grow(&lfs, BLOCK_COUNT_2) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_unmount(&lfs) => 0;

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_unmount(&lfs) => 0;

    // do some work
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_file_t file;
    lfs_file_open(&lfs, &file, "test",
            LFS_O_CREAT | LFS_O_EXCL | LFS_O_WRONLY) => 0;
    lfs_file_write(&lfs, &file, "hello!", 6) => 6;
    lfs_file_close(&lfs, &file) => 0;
    lfs_unmount(&lfs) => 0;

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_file_open(&lfs, &file, "test", LFS_O_RDONLY) => 0;
    uint8_t buffer[256];
    lfs_file_read(&lfs, &file, buffer, sizeof(buffer)) => 6;
    lfs_file_close(&lfs, &file) => 0;
    assert(memcmp(buffer, "hello!", 6) == 0);
    lfs_unmount(&lfs) => 0;
'''


# mount and grow the filesystem
[cases.test_superblocks_shrink]
defines.BLOCK_COUNT = 'ERASE_COUNT'
defines.BLOCK_COUNT_2 = ['ERASE_COUNT/2', 'ERASE_COUNT/4', '2']
defines.KNOWN_BLOCK_COUNT = [true, false]
code = '''
#ifdef LFS_SHRINKNONRELOCATING
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;

    if (KNOWN_BLOCK_COUNT) {
        cfg->block_count = BLOCK_COUNT;
    } else {
        cfg->block_count = 0;
    }

    // mount with block_size < erase_size
    lfs_mount(&lfs, cfg) => 0;
    struct lfs_fsinfo fsinfo;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    // same size is a noop
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_grow(&lfs, BLOCK_COUNT) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT);
    lfs_unmount(&lfs) => 0;

    // grow to new size
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_grow(&lfs, BLOCK_COUNT_2) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_unmount(&lfs) => 0;

    if (KNOWN_BLOCK_COUNT) {
        cfg->block_count = BLOCK_COUNT_2;
    } else {
        cfg->block_count = 0;
    }

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_unmount(&lfs) => 0;

    // mounting with the previous size should fail
    cfg->block_count = BLOCK_COUNT;
    lfs_mount(&lfs, cfg) => LFS_ERR_INVAL;

    if (KNOWN_BLOCK_COUNT) {
        cfg->block_count = BLOCK_COUNT_2;
    } else {
        cfg->block_count = 0;
    }

    // same size is a noop
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_grow(&lfs, BLOCK_COUNT_2) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_unmount(&lfs) => 0;

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_unmount(&lfs) => 0;

    // do some work
    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_file_t file;
    lfs_file_open(&lfs, &file, "test",
            LFS_O_CREAT | LFS_O_EXCL | LFS_O_WRONLY) => 0;
    lfs_file_write(&lfs, &file, "hello!", 6) => 6;
    lfs_file_close(&lfs, &file) => 0;
    lfs_unmount(&lfs) => 0;

    lfs_mount(&lfs, cfg) => 0;
    lfs_fs_stat(&lfs, &fsinfo) => 0;
    assert(fsinfo.block_size == BLOCK_SIZE);
    assert(fsinfo.block_count == BLOCK_COUNT_2);
    lfs_file_open(&lfs, &file, "test", LFS_O_RDONLY) => 0;
    uint8_t buffer[256];
    lfs_file_read(&lfs, &file, buffer, sizeof(buffer)) => 6;
    lfs_file_close(&lfs, &file) => 0;
    assert(memcmp(buffer, "hello!", 6) == 0);
    lfs_unmount(&lfs) => 0;
#endif
'''

# test that metadata_max does not cause problems for superblock compaction
[cases.test_superblocks_metadata_max]
defines.METADATA_MAX = [
    'lfs_max(512, PROG_SIZE)',
    'lfs_max(BLOCK_SIZE/2, PROG_SIZE)',
    'BLOCK_SIZE'
]
defines.N = [10, 100, 1000]
code = '''
    lfs_t lfs;
    lfs_format(&lfs, cfg) => 0;
    lfs_mount(&lfs, cfg) => 0;
    for (int i = 0; i < N; i++) {
        lfs_file_t file;
        char name[256];
        sprintf(name, "hello%03x", i);
        lfs_file_open(&lfs, &file, name,
                LFS_O_WRONLY | LFS_O_CREAT | LFS_O_EXCL) => 0;
        lfs_file_close(&lfs, &file) => 0;
        struct lfs_info info;
        lfs_stat(&lfs, name, &info) => 0;
        assert(strcmp(info.name, name) == 0);
        assert(info.type == LFS_TYPE_REG);
    }
    lfs_unmount(&lfs) => 0;
'''