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;
}
