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-rw-r--r--fs/yaffs2/yaffs_yaffs1.c433
1 files changed, 433 insertions, 0 deletions
diff --git a/fs/yaffs2/yaffs_yaffs1.c b/fs/yaffs2/yaffs_yaffs1.c
new file mode 100644
index 00000000000..9eb60308254
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+++ b/fs/yaffs2/yaffs_yaffs1.c
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1/*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
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.
12 */
13
14#include "yaffs_yaffs1.h"
15#include "yportenv.h"
16#include "yaffs_trace.h"
17#include "yaffs_bitmap.h"
18#include "yaffs_getblockinfo.h"
19#include "yaffs_nand.h"
20#include "yaffs_attribs.h"
21
22int yaffs1_scan(struct yaffs_dev *dev)
23{
24 struct yaffs_ext_tags tags;
25 int blk;
26 int result;
27
28 int chunk;
29 int c;
30 int deleted;
31 enum yaffs_block_state state;
32 struct yaffs_obj *hard_list = NULL;
33 struct yaffs_block_info *bi;
34 u32 seq_number;
35 struct yaffs_obj_hdr *oh;
36 struct yaffs_obj *in;
37 struct yaffs_obj *parent;
38
39 int alloc_failed = 0;
40
41 struct yaffs_shadow_fixer *shadow_fixers = NULL;
42
43 u8 *chunk_data;
44
45 yaffs_trace(YAFFS_TRACE_SCAN,
46 "yaffs1_scan starts intstartblk %d intendblk %d...",
47 dev->internal_start_block, dev->internal_end_block);
48
49 chunk_data = yaffs_get_temp_buffer(dev, __LINE__);
50
51 dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
52
53 /* Scan all the blocks to determine their state */
54 bi = dev->block_info;
55 for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
56 blk++) {
57 yaffs_clear_chunk_bits(dev, blk);
58 bi->pages_in_use = 0;
59 bi->soft_del_pages = 0;
60
61 yaffs_query_init_block_state(dev, blk, &state, &seq_number);
62
63 bi->block_state = state;
64 bi->seq_number = seq_number;
65
66 if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
67 bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
68
69 yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
70 "Block scanning block %d state %d seq %d",
71 blk, state, seq_number);
72
73 if (state == YAFFS_BLOCK_STATE_DEAD) {
74 yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
75 "block %d is bad", blk);
76 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
77 yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
78 dev->n_erased_blocks++;
79 dev->n_free_chunks += dev->param.chunks_per_block;
80 }
81 bi++;
82 }
83
84 /* For each block.... */
85 for (blk = dev->internal_start_block;
86 !alloc_failed && blk <= dev->internal_end_block; blk++) {
87
88 cond_resched();
89
90 bi = yaffs_get_block_info(dev, blk);
91 state = bi->block_state;
92
93 deleted = 0;
94
95 /* For each chunk in each block that needs scanning.... */
96 for (c = 0; !alloc_failed && c < dev->param.chunks_per_block &&
97 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
98 /* Read the tags and decide what to do */
99 chunk = blk * dev->param.chunks_per_block + c;
100
101 result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
102 &tags);
103
104 /* Let's have a good look at this chunk... */
105
106 if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED
107 || tags.is_deleted) {
108 /* YAFFS1 only...
109 * A deleted chunk
110 */
111 deleted++;
112 dev->n_free_chunks++;
113 /*T((" %d %d deleted\n",blk,c)); */
114 } else if (!tags.chunk_used) {
115 /* An unassigned chunk in the block
116 * This means that either the block is empty or
117 * this is the one being allocated from
118 */
119
120 if (c == 0) {
121 /* We're looking at the first chunk in the block so the block is unused */
122 state = YAFFS_BLOCK_STATE_EMPTY;
123 dev->n_erased_blocks++;
124 } else {
125 /* this is the block being allocated from */
126 yaffs_trace(YAFFS_TRACE_SCAN,
127 " Allocating from %d %d",
128 blk, c);
129 state = YAFFS_BLOCK_STATE_ALLOCATING;
130 dev->alloc_block = blk;
131 dev->alloc_page = c;
132 dev->alloc_block_finder = blk;
133 /* Set block finder here to encourage the allocator to go forth from here. */
134
135 }
136
137 dev->n_free_chunks +=
138 (dev->param.chunks_per_block - c);
139 } else if (tags.chunk_id > 0) {
140 /* chunk_id > 0 so it is a data chunk... */
141 unsigned int endpos;
142
143 yaffs_set_chunk_bit(dev, blk, c);
144 bi->pages_in_use++;
145
146 in = yaffs_find_or_create_by_number(dev,
147 tags.obj_id,
148 YAFFS_OBJECT_TYPE_FILE);
149 /* PutChunkIntoFile checks for a clash (two data chunks with
150 * the same chunk_id).
151 */
152
153 if (!in)
154 alloc_failed = 1;
155
156 if (in) {
157 if (!yaffs_put_chunk_in_file
158 (in, tags.chunk_id, chunk, 1))
159 alloc_failed = 1;
160 }
161
162 endpos =
163 (tags.chunk_id -
164 1) * dev->data_bytes_per_chunk +
165 tags.n_bytes;
166 if (in
167 && in->variant_type ==
168 YAFFS_OBJECT_TYPE_FILE
169 && in->variant.file_variant.scanned_size <
170 endpos) {
171 in->variant.file_variant.scanned_size =
172 endpos;
173 if (!dev->param.use_header_file_size) {
174 in->variant.
175 file_variant.file_size =
176 in->variant.
177 file_variant.scanned_size;
178 }
179
180 }
181 /* T((" %d %d data %d %d\n",blk,c,tags.obj_id,tags.chunk_id)); */
182 } else {
183 /* chunk_id == 0, so it is an ObjectHeader.
184 * Thus, we read in the object header and make the object
185 */
186 yaffs_set_chunk_bit(dev, blk, c);
187 bi->pages_in_use++;
188
189 result = yaffs_rd_chunk_tags_nand(dev, chunk,
190 chunk_data,
191 NULL);
192
193 oh = (struct yaffs_obj_hdr *)chunk_data;
194
195 in = yaffs_find_by_number(dev, tags.obj_id);
196 if (in && in->variant_type != oh->type) {
197 /* This should not happen, but somehow
198 * Wev'e ended up with an obj_id that has been reused but not yet
199 * deleted, and worse still it has changed type. Delete the old object.
200 */
201
202 yaffs_del_obj(in);
203
204 in = 0;
205 }
206
207 in = yaffs_find_or_create_by_number(dev,
208 tags.obj_id,
209 oh->type);
210
211 if (!in)
212 alloc_failed = 1;
213
214 if (in && oh->shadows_obj > 0) {
215
216 struct yaffs_shadow_fixer *fixer;
217 fixer =
218 kmalloc(sizeof
219 (struct yaffs_shadow_fixer),
220 GFP_NOFS);
221 if (fixer) {
222 fixer->next = shadow_fixers;
223 shadow_fixers = fixer;
224 fixer->obj_id = tags.obj_id;
225 fixer->shadowed_id =
226 oh->shadows_obj;
227 yaffs_trace(YAFFS_TRACE_SCAN,
228 " Shadow fixer: %d shadows %d",
229 fixer->obj_id,
230 fixer->shadowed_id);
231
232 }
233
234 }
235
236 if (in && in->valid) {
237 /* We have already filled this one. We have a duplicate and need to resolve it. */
238
239 unsigned existing_serial = in->serial;
240 unsigned new_serial =
241 tags.serial_number;
242
243 if (((existing_serial + 1) & 3) ==
244 new_serial) {
245 /* Use new one - destroy the exisiting one */
246 yaffs_chunk_del(dev,
247 in->hdr_chunk,
248 1, __LINE__);
249 in->valid = 0;
250 } else {
251 /* Use existing - destroy this one. */
252 yaffs_chunk_del(dev, chunk, 1,
253 __LINE__);
254 }
255 }
256
257 if (in && !in->valid &&
258 (tags.obj_id == YAFFS_OBJECTID_ROOT ||
259 tags.obj_id ==
260 YAFFS_OBJECTID_LOSTNFOUND)) {
261 /* We only load some info, don't fiddle with directory structure */
262 in->valid = 1;
263 in->variant_type = oh->type;
264
265 in->yst_mode = oh->yst_mode;
266 yaffs_load_attribs(in, oh);
267 in->hdr_chunk = chunk;
268 in->serial = tags.serial_number;
269
270 } else if (in && !in->valid) {
271 /* we need to load this info */
272
273 in->valid = 1;
274 in->variant_type = oh->type;
275
276 in->yst_mode = oh->yst_mode;
277 yaffs_load_attribs(in, oh);
278 in->hdr_chunk = chunk;
279 in->serial = tags.serial_number;
280
281 yaffs_set_obj_name_from_oh(in, oh);
282 in->dirty = 0;
283
284 /* directory stuff...
285 * hook up to parent
286 */
287
288 parent =
289 yaffs_find_or_create_by_number
290 (dev, oh->parent_obj_id,
291 YAFFS_OBJECT_TYPE_DIRECTORY);
292 if (!parent)
293 alloc_failed = 1;
294 if (parent && parent->variant_type ==
295 YAFFS_OBJECT_TYPE_UNKNOWN) {
296 /* Set up as a directory */
297 parent->variant_type =
298 YAFFS_OBJECT_TYPE_DIRECTORY;
299 INIT_LIST_HEAD(&parent->
300 variant.dir_variant.children);
301 } else if (!parent
302 || parent->variant_type !=
303 YAFFS_OBJECT_TYPE_DIRECTORY) {
304 /* Hoosterman, another problem....
305 * We're trying to use a non-directory as a directory
306 */
307
308 yaffs_trace(YAFFS_TRACE_ERROR,
309 "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
310 );
311 parent = dev->lost_n_found;
312 }
313
314 yaffs_add_obj_to_dir(parent, in);
315
316 if (0 && (parent == dev->del_dir ||
317 parent ==
318 dev->unlinked_dir)) {
319 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
320 dev->n_deleted_files++;
321 }
322 /* Note re hardlinks.
323 * Since we might scan a hardlink before its equivalent object is scanned
324 * we put them all in a list.
325 * After scanning is complete, we should have all the objects, so we run through this
326 * list and fix up all the chains.
327 */
328
329 switch (in->variant_type) {
330 case YAFFS_OBJECT_TYPE_UNKNOWN:
331 /* Todo got a problem */
332 break;
333 case YAFFS_OBJECT_TYPE_FILE:
334 if (dev->param.
335 use_header_file_size)
336
337 in->variant.
338 file_variant.file_size
339 = oh->file_size;
340
341 break;
342 case YAFFS_OBJECT_TYPE_HARDLINK:
343 in->variant.
344 hardlink_variant.equiv_id =
345 oh->equiv_id;
346 in->hard_links.next =
347 (struct list_head *)
348 hard_list;
349 hard_list = in;
350 break;
351 case YAFFS_OBJECT_TYPE_DIRECTORY:
352 /* Do nothing */
353 break;
354 case YAFFS_OBJECT_TYPE_SPECIAL:
355 /* Do nothing */
356 break;
357 case YAFFS_OBJECT_TYPE_SYMLINK:
358 in->variant.symlink_variant.
359 alias =
360 yaffs_clone_str(oh->alias);
361 if (!in->variant.
362 symlink_variant.alias)
363 alloc_failed = 1;
364 break;
365 }
366
367 }
368 }
369 }
370
371 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
372 /* If we got this far while scanning, then the block is fully allocated. */
373 state = YAFFS_BLOCK_STATE_FULL;
374 }
375
376 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
377 /* If the block was partially allocated then treat it as fully allocated. */
378 state = YAFFS_BLOCK_STATE_FULL;
379 dev->alloc_block = -1;
380 }
381
382 bi->block_state = state;
383
384 /* Now let's see if it was dirty */
385 if (bi->pages_in_use == 0 &&
386 !bi->has_shrink_hdr &&
387 bi->block_state == YAFFS_BLOCK_STATE_FULL) {
388 yaffs_block_became_dirty(dev, blk);
389 }
390
391 }
392
393 /* Ok, we've done all the scanning.
394 * Fix up the hard link chains.
395 * We should now have scanned all the objects, now it's time to add these
396 * hardlinks.
397 */
398
399 yaffs_link_fixup(dev, hard_list);
400
401 /* Fix up any shadowed objects */
402 {
403 struct yaffs_shadow_fixer *fixer;
404 struct yaffs_obj *obj;
405
406 while (shadow_fixers) {
407 fixer = shadow_fixers;
408 shadow_fixers = fixer->next;
409 /* Complete the rename transaction by deleting the shadowed object
410 * then setting the object header to unshadowed.
411 */
412 obj = yaffs_find_by_number(dev, fixer->shadowed_id);
413 if (obj)
414 yaffs_del_obj(obj);
415
416 obj = yaffs_find_by_number(dev, fixer->obj_id);
417
418 if (obj)
419 yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
420
421 kfree(fixer);
422 }
423 }
424
425 yaffs_release_temp_buffer(dev, chunk_data, __LINE__);
426
427 if (alloc_failed)
428 return YAFFS_FAIL;
429
430 yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
431
432 return YAFFS_OK;
433}
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