- if (found_inline) {
- u64 mask = root->sectorsize - 1;
- search_start = (extent_end + mask) & ~mask;
- } else
- search_start = extent_end;
-
- /* truncate existing extent */
- if (start > key.offset) {
- u64 new_num;
- u64 old_num;
- keep = 1;
- WARN_ON(start & (root->sectorsize - 1));
- if (found_extent) {
- new_num = start - key.offset;
- old_num = btrfs_file_extent_num_bytes(leaf,
- extent);
- *hint_byte =
- btrfs_file_extent_disk_bytenr(leaf,
- extent);
- if (btrfs_file_extent_disk_bytenr(leaf,
- extent)) {
- inode_sub_bytes(inode, old_num -
- new_num);
- }
- btrfs_set_file_extent_num_bytes(leaf,
- extent, new_num);
- btrfs_mark_buffer_dirty(leaf);
- } else if (key.offset < inline_limit &&
- (end > extent_end) &&
- (inline_limit < extent_end)) {
- u32 new_size;
- new_size = btrfs_file_extent_calc_inline_size(
- inline_limit - key.offset);
- inode_sub_bytes(inode, extent_end -
- inline_limit);
- btrfs_set_file_extent_ram_bytes(leaf, extent,
- new_size);
- if (!compression && !encryption) {
- btrfs_truncate_item(trans, root, path,
- new_size, 1);
- }
- }
- }
- /* delete the entire extent */
- if (!keep) {
- if (found_inline)
- inode_sub_bytes(inode, extent_end -
- key.offset);
- ret = btrfs_del_item(trans, root, path);
- /* TODO update progress marker and return */
- BUG_ON(ret);
- extent = NULL;
- btrfs_release_path(root, path);
- /* the extent will be freed later */
- }
- if (bookend && found_inline && start <= key.offset) {
- u32 new_size;
- new_size = btrfs_file_extent_calc_inline_size(
- extent_end - end);
- inode_sub_bytes(inode, end - key.offset);
- btrfs_set_file_extent_ram_bytes(leaf, extent,
- new_size);
- if (!compression && !encryption)
- ret = btrfs_truncate_item(trans, root, path,
- new_size, 0);
- BUG_ON(ret);
- }
- /* create bookend, splitting the extent in two */
- if (bookend && found_extent) {
- struct btrfs_key ins;
- ins.objectid = inode->i_ino;
- ins.offset = end;
- btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
-
- btrfs_release_path(root, path);
- ret = btrfs_insert_empty_item(trans, root, path, &ins,
- sizeof(*extent));
- BUG_ON(ret);