+static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
+{
+ u32 i;
+ int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
+
+ yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+ "allocating checkpt block: erased %d reserved %d avail %d next %d ",
+ dev->n_erased_blocks, dev->param.n_reserved_blocks,
+ blocks_avail, dev->checkpt_next_block);
+
+ if (dev->checkpt_next_block >= 0 &&
+ dev->checkpt_next_block <= (int)dev->internal_end_block &&
+ blocks_avail > 0) {
+
+ for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+ i++) {
+ struct yaffs_block_info *bi;
+
+ bi = yaffs_get_block_info(dev, i);
+ if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+ dev->checkpt_next_block = i + 1;
+ dev->checkpt_cur_block = i;
+ yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+ "allocating checkpt block %d", i);
+ return;
+ }
+ }
+ }
+ yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
+
+ dev->checkpt_next_block = -1;
+ dev->checkpt_cur_block = -1;
+}
+
+static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
+{
+ u32 i;
+ struct yaffs_ext_tags tags;
+
+ yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+ "find next checkpt block: start: blocks %d next %d",
+ dev->blocks_in_checkpt, dev->checkpt_next_block);
+
+ if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
+ for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+ i++) {
+ int chunk = i * dev->param.chunks_per_block;
+ enum yaffs_block_state state;
+ u32 seq;
+
+ dev->tagger.read_chunk_tags_fn(dev,
+ apply_chunk_offset(dev, chunk),
+ NULL, &tags);
+ yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+ "find next checkpt block: search: block %d state %d oid %d seq %d eccr %d",
+ i, (int) state,
+ tags.obj_id, tags.seq_number,
+ tags.ecc_result);
+
+ if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
+ continue;
+
+ dev->tagger.query_block_fn(dev,
+ apply_block_offset(dev, i),
+ &state, &seq);
+ if (state == YAFFS_BLOCK_STATE_DEAD)
+ continue;
+
+ /* Right kind of block */
+ dev->checkpt_next_block = tags.obj_id;
+ dev->checkpt_cur_block = i;
+ dev->checkpt_block_list[dev->blocks_in_checkpt] = i;
+ dev->blocks_in_checkpt++;
+ yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+ "found checkpt block %d", i);
+ return;
+ }
+
+ yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
+
+ dev->checkpt_next_block = -1;
+ dev->checkpt_cur_block = -1;
+}
+
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)