static int check_free_space_extents(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *cache,
struct btrfs_path *path,
struct free_space_extent *extents,
unsigned int num_extents)
{
struct btrfs_free_space_info *info;
u32 flags;
int ret;
info = search_free_space_info(trans, fs_info, cache, path, 0);
if (IS_ERR(info)) {
test_msg("Could not find free space info\n");
btrfs_release_path(path);
return PTR_ERR(info);
}
flags = btrfs_free_space_flags(path->nodes[0], info);
btrfs_release_path(path);
ret = __check_free_space_extents(trans, fs_info, cache, path, extents,
num_extents);
if (ret)
return ret;
/* Flip it to the other format and check that for good measure. */
if (flags & BTRFS_FREE_SPACE_USING_BITMAPS) {
ret = convert_free_space_to_extents(trans, fs_info, cache, path);
if (ret) {
test_msg("Could not convert to extents\n");
return ret;
}
} else {
ret = convert_free_space_to_bitmaps(trans, fs_info, cache, path);
if (ret) {
test_msg("Could not convert to bitmaps\n");
return ret;
}
}
return __check_free_space_extents(trans, fs_info, cache, path, extents,
num_extents);
}
static int update_free_space_extent_count(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info,
struct btrfs_block_group_cache *block_group,
struct btrfs_path *path,
int new_extents)
{
struct btrfs_free_space_info *info;
u32 flags;
u32 extent_count;
int ret = 0;
if (new_extents == 0)
return 0;
info = search_free_space_info(trans, fs_info, block_group, path, 1);
if (IS_ERR(info)) {
ret = PTR_ERR(info);
goto out;
}
flags = btrfs_free_space_flags(path->nodes[0], info);
extent_count = btrfs_free_space_extent_count(path->nodes[0], info);
extent_count += new_extents;
btrfs_set_free_space_extent_count(path->nodes[0], info, extent_count);
btrfs_mark_buffer_dirty(path->nodes[0]);
btrfs_release_path(path);
if (!(flags & BTRFS_FREE_SPACE_USING_BITMAPS) &&
extent_count > block_group->bitmap_high_thresh) {
ret = convert_free_space_to_bitmaps(trans, fs_info, block_group,
path);
} else if ((flags & BTRFS_FREE_SPACE_USING_BITMAPS) &&
extent_count < block_group->bitmap_low_thresh) {
ret = convert_free_space_to_extents(trans, fs_info, block_group,
path);
}
out:
return ret;
}
static int run_test(test_func_t test_func, int bitmaps)
{
struct btrfs_root *root = NULL;
struct btrfs_block_group_cache *cache = NULL;
struct btrfs_trans_handle trans;
struct btrfs_path *path = NULL;
int ret;
root = btrfs_alloc_dummy_root();
if (IS_ERR(root)) {
test_msg("Couldn't allocate dummy root\n");
ret = PTR_ERR(root);
goto out;
}
root->fs_info = btrfs_alloc_dummy_fs_info();
if (!root->fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
ret = -ENOMEM;
goto out;
}
btrfs_set_super_compat_ro_flags(root->fs_info->super_copy,
BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE);
root->fs_info->free_space_root = root;
root->fs_info->tree_root = root;
root->node = alloc_test_extent_buffer(root->fs_info, 4096);
if (!root->node) {
test_msg("Couldn't allocate dummy buffer\n");
ret = -ENOMEM;
goto out;
}
btrfs_set_header_level(root->node, 0);
btrfs_set_header_nritems(root->node, 0);
root->alloc_bytenr += 8192;
cache = btrfs_alloc_dummy_block_group(8 * BITMAP_RANGE);
if (!cache) {
test_msg("Couldn't allocate dummy block group cache\n");
ret = -ENOMEM;
goto out;
}
cache->bitmap_low_thresh = 0;
cache->bitmap_high_thresh = (u32)-1;
cache->needs_free_space = 1;
btrfs_init_dummy_trans(&trans);
path = btrfs_alloc_path();
if (!path) {
test_msg("Couldn't allocate path\n");
return -ENOMEM;
}
ret = add_block_group_free_space(&trans, root->fs_info, cache);
if (ret) {
test_msg("Could not add block group free space\n");
goto out;
}
if (bitmaps) {
ret = convert_free_space_to_bitmaps(&trans, root->fs_info,
cache, path);
if (ret) {
test_msg("Could not convert block group to bitmaps\n");
goto out;
}
}
ret = test_func(&trans, root->fs_info, cache, path);
if (ret)
goto out;
ret = remove_block_group_free_space(&trans, root->fs_info, cache);
if (ret) {
test_msg("Could not remove block group free space\n");
goto out;
}
if (btrfs_header_nritems(root->node) != 0) {
test_msg("Free space tree has leftover items\n");
ret = -EINVAL;
goto out;
}
ret = 0;
out:
btrfs_free_path(path);
btrfs_free_dummy_block_group(cache);
btrfs_free_dummy_root(root);
return ret;
}
