2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2011 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include "yaffs_checkptrw.h"
15 #include "yaffs_getblockinfo.h"
17 static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
19 int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
21 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
22 "checkpt blocks_avail = %d", blocks_avail);
24 return (blocks_avail <= 0) ? 0 : 1;
27 static int yaffs_checkpt_erase(struct yaffs_dev *dev)
31 if (!dev->param.erase_fn)
33 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
34 "checking blocks %d to %d",
35 dev->internal_start_block, dev->internal_end_block);
37 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
38 struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
39 if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
40 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
41 "erasing checkpt block %d", i);
47 i - dev->block_offset /* realign */)) {
48 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
49 dev->n_erased_blocks++;
51 dev->param.chunks_per_block;
53 dev->param.bad_block_fn(dev, i);
54 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
59 dev->blocks_in_checkpt = 0;
64 static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
67 int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
69 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
70 "allocating checkpt block: erased %d reserved %d avail %d next %d ",
71 dev->n_erased_blocks, dev->param.n_reserved_blocks,
72 blocks_avail, dev->checkpt_next_block);
74 if (dev->checkpt_next_block >= 0 &&
75 dev->checkpt_next_block <= dev->internal_end_block &&
78 for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
80 struct yaffs_block_info *bi =
81 yaffs_get_block_info(dev, i);
82 if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
83 dev->checkpt_next_block = i + 1;
84 dev->checkpt_cur_block = i;
85 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
86 "allocating checkpt block %d", i);
91 yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
93 dev->checkpt_next_block = -1;
94 dev->checkpt_cur_block = -1;
97 static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
100 struct yaffs_ext_tags tags;
102 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
103 "find next checkpt block: start: blocks %d next %d",
104 dev->blocks_in_checkpt, dev->checkpt_next_block);
106 if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
107 for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
109 int chunk = i * dev->param.chunks_per_block;
110 int realigned_chunk = chunk - dev->chunk_offset;
111 enum yaffs_block_state state;
114 dev->param.read_chunk_tags_fn(dev, realigned_chunk,
116 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
117 "find next checkpt block: search: block %d state %d oid %d seq %d eccr %d",
119 tags.obj_id, tags.seq_number,
122 if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
125 dev->param.query_block_fn(dev, i, &state, &seq);
126 if (state == YAFFS_BLOCK_STATE_DEAD)
129 /* Right kind of block */
130 dev->checkpt_next_block = tags.obj_id;
131 dev->checkpt_cur_block = i;
132 dev->checkpt_block_list[dev->blocks_in_checkpt] = i;
133 dev->blocks_in_checkpt++;
134 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
135 "found checkpt block %d", i);
139 yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
141 dev->checkpt_next_block = -1;
142 dev->checkpt_cur_block = -1;
145 int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
149 dev->checkpt_open_write = writing;
151 /* Got the functions we need? */
152 if (!dev->param.write_chunk_tags_fn ||
153 !dev->param.read_chunk_tags_fn ||
154 !dev->param.erase_fn || !dev->param.bad_block_fn)
157 if (writing && !yaffs2_checkpt_space_ok(dev))
160 if (!dev->checkpt_buffer)
161 dev->checkpt_buffer =
162 kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
163 if (!dev->checkpt_buffer)
166 dev->checkpt_page_seq = 0;
167 dev->checkpt_byte_count = 0;
168 dev->checkpt_sum = 0;
169 dev->checkpt_xor = 0;
170 dev->checkpt_cur_block = -1;
171 dev->checkpt_cur_chunk = -1;
172 dev->checkpt_next_block = dev->internal_start_block;
174 /* Erase all the blocks in the checkpoint area */
176 memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
177 dev->checkpt_byte_offs = 0;
178 return yaffs_checkpt_erase(dev);
181 /* Set to a value that will kick off a read */
182 dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
183 /* A checkpoint block list of 1 checkpoint block per 16 block is
184 * (hopefully) going to be way more than we need */
185 dev->blocks_in_checkpt = 0;
186 dev->checkpt_max_blocks =
187 (dev->internal_end_block - dev->internal_start_block) / 16 + 2;
188 dev->checkpt_block_list =
189 kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);
191 if (!dev->checkpt_block_list)
194 for (i = 0; i < dev->checkpt_max_blocks; i++)
195 dev->checkpt_block_list[i] = -1;
200 int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
204 composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff);
205 *sum = composite_sum;
209 static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
213 struct yaffs_ext_tags tags;
215 if (dev->checkpt_cur_block < 0) {
216 yaffs2_checkpt_find_erased_block(dev);
217 dev->checkpt_cur_chunk = 0;
220 if (dev->checkpt_cur_block < 0)
224 tags.obj_id = dev->checkpt_next_block; /* Hint to next place to look */
225 tags.chunk_id = dev->checkpt_page_seq + 1;
226 tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
227 tags.n_bytes = dev->data_bytes_per_chunk;
228 if (dev->checkpt_cur_chunk == 0) {
229 /* First chunk we write for the block? Set block state to
231 struct yaffs_block_info *bi =
232 yaffs_get_block_info(dev, dev->checkpt_cur_block);
233 bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
234 dev->blocks_in_checkpt++;
238 dev->checkpt_cur_block * dev->param.chunks_per_block +
239 dev->checkpt_cur_chunk;
241 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
242 "checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
243 chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
244 tags.obj_id, tags.chunk_id);
246 realigned_chunk = chunk - dev->chunk_offset;
248 dev->n_page_writes++;
250 dev->param.write_chunk_tags_fn(dev, realigned_chunk,
251 dev->checkpt_buffer, &tags);
252 dev->checkpt_byte_offs = 0;
253 dev->checkpt_page_seq++;
254 dev->checkpt_cur_chunk++;
255 if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
256 dev->checkpt_cur_chunk = 0;
257 dev->checkpt_cur_block = -1;
259 memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
264 int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes)
268 u8 *data_bytes = (u8 *) data;
270 if (!dev->checkpt_buffer)
273 if (!dev->checkpt_open_write)
276 while (i < n_bytes && ok) {
277 dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;
278 dev->checkpt_sum += *data_bytes;
279 dev->checkpt_xor ^= *data_bytes;
281 dev->checkpt_byte_offs++;
284 dev->checkpt_byte_count++;
286 if (dev->checkpt_byte_offs < 0 ||
287 dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)
288 ok = yaffs2_checkpt_flush_buffer(dev);
294 int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
298 struct yaffs_ext_tags tags;
301 u8 *data_bytes = (u8 *) data;
303 if (!dev->checkpt_buffer)
306 if (dev->checkpt_open_write)
309 while (i < n_bytes && ok) {
311 if (dev->checkpt_byte_offs < 0 ||
312 dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {
314 if (dev->checkpt_cur_block < 0) {
315 yaffs2_checkpt_find_block(dev);
316 dev->checkpt_cur_chunk = 0;
319 if (dev->checkpt_cur_block < 0) {
324 chunk = dev->checkpt_cur_block *
325 dev->param.chunks_per_block +
326 dev->checkpt_cur_chunk;
328 realigned_chunk = chunk - dev->chunk_offset;
331 /* read in the next chunk */
332 dev->param.read_chunk_tags_fn(dev,
337 if (tags.chunk_id != (dev->checkpt_page_seq + 1) ||
338 tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
339 tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA) {
344 dev->checkpt_byte_offs = 0;
345 dev->checkpt_page_seq++;
346 dev->checkpt_cur_chunk++;
348 if (dev->checkpt_cur_chunk >=
349 dev->param.chunks_per_block)
350 dev->checkpt_cur_block = -1;
353 *data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
354 dev->checkpt_sum += *data_bytes;
355 dev->checkpt_xor ^= *data_bytes;
356 dev->checkpt_byte_offs++;
359 dev->checkpt_byte_count++;
365 int yaffs_checkpt_close(struct yaffs_dev *dev)
369 if (dev->checkpt_open_write) {
370 if (dev->checkpt_byte_offs != 0)
371 yaffs2_checkpt_flush_buffer(dev);
372 } else if (dev->checkpt_block_list) {
374 i < dev->blocks_in_checkpt &&
375 dev->checkpt_block_list[i] >= 0; i++) {
376 int blk = dev->checkpt_block_list[i];
377 struct yaffs_block_info *bi = NULL;
379 if (dev->internal_start_block <= blk &&
380 blk <= dev->internal_end_block)
381 bi = yaffs_get_block_info(dev, blk);
382 if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
383 bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
385 kfree(dev->checkpt_block_list);
386 dev->checkpt_block_list = NULL;
389 dev->n_free_chunks -=
390 dev->blocks_in_checkpt * dev->param.chunks_per_block;
391 dev->n_erased_blocks -= dev->blocks_in_checkpt;
393 yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d",
394 dev->checkpt_byte_count);
396 if (dev->checkpt_buffer) {
397 /* free the buffer */
398 kfree(dev->checkpt_buffer);
399 dev->checkpt_buffer = NULL;
406 int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)
408 /* Erase the checkpoint data */
410 yaffs_trace(YAFFS_TRACE_CHECKPOINT,
411 "checkpoint invalidate of %d blocks",
412 dev->blocks_in_checkpt);
414 return yaffs_checkpt_erase(dev);