17 static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)  in yaffs2_checkpt_space_ok()  argument
19 	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;  in yaffs2_checkpt_space_ok()
27 static int yaffs_checkpt_erase(struct yaffs_dev *dev)  in yaffs_checkpt_erase()  argument
31 	if (!dev->param.erase_fn)  in yaffs_checkpt_erase()
35 		dev->internal_start_block, dev->internal_end_block);  in yaffs_checkpt_erase()
37 	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {  in yaffs_checkpt_erase()
38 		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);  in yaffs_checkpt_erase()
43 			dev->n_erasures++;  in yaffs_checkpt_erase()
45 			if (dev->param.  in yaffs_checkpt_erase()
46 			    erase_fn(dev,  in yaffs_checkpt_erase()
47 				     i - dev->block_offset /* realign */)) {  in yaffs_checkpt_erase()
49 				dev->n_erased_blocks++;  in yaffs_checkpt_erase()
50 				dev->n_free_chunks +=  in yaffs_checkpt_erase()
51 				    dev->param.chunks_per_block;  in yaffs_checkpt_erase()
53 				dev->param.bad_block_fn(dev, i);  in yaffs_checkpt_erase()
59 	dev->blocks_in_checkpt = 0;  in yaffs_checkpt_erase()
64 static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)  in yaffs2_checkpt_find_erased_block()  argument
67 	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;  in yaffs2_checkpt_find_erased_block()
71 		dev->n_erased_blocks, dev->param.n_reserved_blocks,  in yaffs2_checkpt_find_erased_block()
72 		blocks_avail, dev->checkpt_next_block);  in yaffs2_checkpt_find_erased_block()
74 	if (dev->checkpt_next_block >= 0 &&  in yaffs2_checkpt_find_erased_block()
75 	    dev->checkpt_next_block <= dev->internal_end_block &&  in yaffs2_checkpt_find_erased_block()
78 		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;  in yaffs2_checkpt_find_erased_block()
81 			    yaffs_get_block_info(dev, i);  in yaffs2_checkpt_find_erased_block()
83 				dev->checkpt_next_block = i + 1;  in yaffs2_checkpt_find_erased_block()
84 				dev->checkpt_cur_block = i;  in yaffs2_checkpt_find_erased_block()
93 	dev->checkpt_next_block = -1;  in yaffs2_checkpt_find_erased_block()
94 	dev->checkpt_cur_block = -1;  in yaffs2_checkpt_find_erased_block()
97 static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)  in yaffs2_checkpt_find_block()  argument
104 		dev->blocks_in_checkpt, dev->checkpt_next_block);  in yaffs2_checkpt_find_block()
106 	if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)  in yaffs2_checkpt_find_block()
107 		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;  in yaffs2_checkpt_find_block()
109 			int chunk = i * dev->param.chunks_per_block;  in yaffs2_checkpt_find_block()
110 			int realigned_chunk = chunk - dev->chunk_offset;  in yaffs2_checkpt_find_block()
112 			dev->param.read_chunk_tags_fn(dev, realigned_chunk,  in yaffs2_checkpt_find_block()
121 				dev->checkpt_next_block = tags.obj_id;  in yaffs2_checkpt_find_block()
122 				dev->checkpt_cur_block = i;  in yaffs2_checkpt_find_block()
123 				dev->checkpt_block_list[dev->  in yaffs2_checkpt_find_block()
125 				dev->blocks_in_checkpt++;  in yaffs2_checkpt_find_block()
134 	dev->checkpt_next_block = -1;  in yaffs2_checkpt_find_block()
135 	dev->checkpt_cur_block = -1;  in yaffs2_checkpt_find_block()
138 int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)  in yaffs2_checkpt_open()  argument
142 	dev->checkpt_open_write = writing;  in yaffs2_checkpt_open()
145 	if (!dev->param.write_chunk_tags_fn ||  in yaffs2_checkpt_open()
146 	    !dev->param.read_chunk_tags_fn ||  in yaffs2_checkpt_open()
147 	    !dev->param.erase_fn || !dev->param.bad_block_fn)  in yaffs2_checkpt_open()
150 	if (writing && !yaffs2_checkpt_space_ok(dev))  in yaffs2_checkpt_open()
153 	if (!dev->checkpt_buffer)  in yaffs2_checkpt_open()
154 		dev->checkpt_buffer =  in yaffs2_checkpt_open()
155 		    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);  in yaffs2_checkpt_open()
156 	if (!dev->checkpt_buffer)  in yaffs2_checkpt_open()
159 	dev->checkpt_page_seq = 0;  in yaffs2_checkpt_open()
160 	dev->checkpt_byte_count = 0;  in yaffs2_checkpt_open()
161 	dev->checkpt_sum = 0;  in yaffs2_checkpt_open()
162 	dev->checkpt_xor = 0;  in yaffs2_checkpt_open()
163 	dev->checkpt_cur_block = -1;  in yaffs2_checkpt_open()
164 	dev->checkpt_cur_chunk = -1;  in yaffs2_checkpt_open()
165 	dev->checkpt_next_block = dev->internal_start_block;  in yaffs2_checkpt_open()
169 		memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);  in yaffs2_checkpt_open()
170 		dev->checkpt_byte_offs = 0;  in yaffs2_checkpt_open()
171 		return yaffs_checkpt_erase(dev);  in yaffs2_checkpt_open()
175 	dev->checkpt_byte_offs = dev->data_bytes_per_chunk;  in yaffs2_checkpt_open()
178 	dev->blocks_in_checkpt = 0;  in yaffs2_checkpt_open()
179 	dev->checkpt_max_blocks =  in yaffs2_checkpt_open()
180 	    (dev->internal_end_block - dev->internal_start_block) / 16 + 2;  in yaffs2_checkpt_open()
181 	dev->checkpt_block_list =  in yaffs2_checkpt_open()
182 	    kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);  in yaffs2_checkpt_open()
184 	if (!dev->checkpt_block_list)  in yaffs2_checkpt_open()
187 	for (i = 0; i < dev->checkpt_max_blocks; i++)  in yaffs2_checkpt_open()
188 		dev->checkpt_block_list[i] = -1;  in yaffs2_checkpt_open()
193 int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)  in yaffs2_get_checkpt_sum()  argument
197 	composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff);  in yaffs2_get_checkpt_sum()
202 static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)  in yaffs2_checkpt_flush_buffer()  argument
208 	if (dev->checkpt_cur_block < 0) {  in yaffs2_checkpt_flush_buffer()
209 		yaffs2_checkpt_find_erased_block(dev);  in yaffs2_checkpt_flush_buffer()
210 		dev->checkpt_cur_chunk = 0;  in yaffs2_checkpt_flush_buffer()
213 	if (dev->checkpt_cur_block < 0)  in yaffs2_checkpt_flush_buffer()
217 	tags.obj_id = dev->checkpt_next_block;	/* Hint to next place to look */  in yaffs2_checkpt_flush_buffer()
218 	tags.chunk_id = dev->checkpt_page_seq + 1;  in yaffs2_checkpt_flush_buffer()
220 	tags.n_bytes = dev->data_bytes_per_chunk;  in yaffs2_checkpt_flush_buffer()
221 	if (dev->checkpt_cur_chunk == 0) {  in yaffs2_checkpt_flush_buffer()
225 		    yaffs_get_block_info(dev, dev->checkpt_cur_block);  in yaffs2_checkpt_flush_buffer()
227 		dev->blocks_in_checkpt++;  in yaffs2_checkpt_flush_buffer()
231 	    dev->checkpt_cur_block * dev->param.chunks_per_block +  in yaffs2_checkpt_flush_buffer()
232 	    dev->checkpt_cur_chunk;  in yaffs2_checkpt_flush_buffer()
236 		chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,  in yaffs2_checkpt_flush_buffer()
239 	realigned_chunk = chunk - dev->chunk_offset;  in yaffs2_checkpt_flush_buffer()
241 	dev->n_page_writes++;  in yaffs2_checkpt_flush_buffer()
243 	dev->param.write_chunk_tags_fn(dev, realigned_chunk,  in yaffs2_checkpt_flush_buffer()
244 				       dev->checkpt_buffer, &tags);  in yaffs2_checkpt_flush_buffer()
245 	dev->checkpt_byte_offs = 0;  in yaffs2_checkpt_flush_buffer()
246 	dev->checkpt_page_seq++;  in yaffs2_checkpt_flush_buffer()
247 	dev->checkpt_cur_chunk++;  in yaffs2_checkpt_flush_buffer()
248 	if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {  in yaffs2_checkpt_flush_buffer()
249 		dev->checkpt_cur_chunk = 0;  in yaffs2_checkpt_flush_buffer()
250 		dev->checkpt_cur_block = -1;  in yaffs2_checkpt_flush_buffer()
252 	memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);  in yaffs2_checkpt_flush_buffer()
257 int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes)  in yaffs2_checkpt_wr()  argument
263 	if (!dev->checkpt_buffer)  in yaffs2_checkpt_wr()
266 	if (!dev->checkpt_open_write)  in yaffs2_checkpt_wr()
270 		dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;  in yaffs2_checkpt_wr()
271 		dev->checkpt_sum += *data_bytes;  in yaffs2_checkpt_wr()
272 		dev->checkpt_xor ^= *data_bytes;  in yaffs2_checkpt_wr()
274 		dev->checkpt_byte_offs++;  in yaffs2_checkpt_wr()
277 		dev->checkpt_byte_count++;  in yaffs2_checkpt_wr()
279 		if (dev->checkpt_byte_offs < 0 ||  in yaffs2_checkpt_wr()
280 		    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)  in yaffs2_checkpt_wr()
281 			ok = yaffs2_checkpt_flush_buffer(dev);  in yaffs2_checkpt_wr()
287 int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)  in yaffs2_checkpt_rd()  argument
296 	if (!dev->checkpt_buffer)  in yaffs2_checkpt_rd()
299 	if (dev->checkpt_open_write)  in yaffs2_checkpt_rd()
304 		if (dev->checkpt_byte_offs < 0 ||  in yaffs2_checkpt_rd()
305 		    dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {  in yaffs2_checkpt_rd()
307 			if (dev->checkpt_cur_block < 0) {  in yaffs2_checkpt_rd()
308 				yaffs2_checkpt_find_block(dev);  in yaffs2_checkpt_rd()
309 				dev->checkpt_cur_chunk = 0;  in yaffs2_checkpt_rd()
312 			if (dev->checkpt_cur_block < 0) {  in yaffs2_checkpt_rd()
317 			chunk = dev->checkpt_cur_block *  in yaffs2_checkpt_rd()
318 			    dev->param.chunks_per_block +  in yaffs2_checkpt_rd()
319 			    dev->checkpt_cur_chunk;  in yaffs2_checkpt_rd()
321 			realigned_chunk = chunk - dev->chunk_offset;  in yaffs2_checkpt_rd()
322 			dev->n_page_reads++;  in yaffs2_checkpt_rd()
325 			dev->param.read_chunk_tags_fn(dev,  in yaffs2_checkpt_rd()
327 						dev->checkpt_buffer,  in yaffs2_checkpt_rd()
330 			if (tags.chunk_id != (dev->checkpt_page_seq + 1) ||  in yaffs2_checkpt_rd()
337 			dev->checkpt_byte_offs = 0;  in yaffs2_checkpt_rd()
338 			dev->checkpt_page_seq++;  in yaffs2_checkpt_rd()
339 			dev->checkpt_cur_chunk++;  in yaffs2_checkpt_rd()
341 			if (dev->checkpt_cur_chunk >=  in yaffs2_checkpt_rd()
342 					dev->param.chunks_per_block)  in yaffs2_checkpt_rd()
343 				dev->checkpt_cur_block = -1;  in yaffs2_checkpt_rd()
346 		*data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];  in yaffs2_checkpt_rd()
347 		dev->checkpt_sum += *data_bytes;  in yaffs2_checkpt_rd()
348 		dev->checkpt_xor ^= *data_bytes;  in yaffs2_checkpt_rd()
349 		dev->checkpt_byte_offs++;  in yaffs2_checkpt_rd()
352 		dev->checkpt_byte_count++;  in yaffs2_checkpt_rd()
358 int yaffs_checkpt_close(struct yaffs_dev *dev)  in yaffs_checkpt_close()  argument
362 	if (dev->checkpt_open_write) {  in yaffs_checkpt_close()
363 		if (dev->checkpt_byte_offs != 0)  in yaffs_checkpt_close()
364 			yaffs2_checkpt_flush_buffer(dev);  in yaffs_checkpt_close()
365 	} else if (dev->checkpt_block_list) {  in yaffs_checkpt_close()
367 		     i < dev->blocks_in_checkpt &&  in yaffs_checkpt_close()
368 		     dev->checkpt_block_list[i] >= 0; i++) {  in yaffs_checkpt_close()
369 			int blk = dev->checkpt_block_list[i];  in yaffs_checkpt_close()
372 			if (dev->internal_start_block <= blk &&  in yaffs_checkpt_close()
373 			    blk <= dev->internal_end_block)  in yaffs_checkpt_close()
374 				bi = yaffs_get_block_info(dev, blk);  in yaffs_checkpt_close()
378 		kfree(dev->checkpt_block_list);  in yaffs_checkpt_close()
379 		dev->checkpt_block_list = NULL;  in yaffs_checkpt_close()
382 	dev->n_free_chunks -=  in yaffs_checkpt_close()
383 		dev->blocks_in_checkpt * dev->param.chunks_per_block;  in yaffs_checkpt_close()
384 	dev->n_erased_blocks -= dev->blocks_in_checkpt;  in yaffs_checkpt_close()
387 		dev->checkpt_byte_count);  in yaffs_checkpt_close()
389 	if (dev->checkpt_buffer) {  in yaffs_checkpt_close()
391 		kfree(dev->checkpt_buffer);  in yaffs_checkpt_close()
392 		dev->checkpt_buffer = NULL;  in yaffs_checkpt_close()
399 int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)  in yaffs2_checkpt_invalidate_stream()  argument
405 		dev->blocks_in_checkpt);  in yaffs2_checkpt_invalidate_stream()
407 	return yaffs_checkpt_erase(dev);  in yaffs2_checkpt_invalidate_stream()