1 /*
2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
3 * yaffs_ramdisk.c: yaffs ram disk component
4 *
5 * Copyright (C) 2002 Aleph One Ltd.
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
15 // This provides a YAFFS nand emulation on a file for emulating 2kB pages.
16 // THis is only intended as test code to test persistence etc.
17
18 const char *yaffs_flashif_c_version = "$Id: yaffs_fileem2k.c,v 1.7 2006/10/13 08:52:49 charles Exp $";
19
20
21 #include "yportenv.h"
22
23 #include "yaffs_flashif.h"
24 #include "yaffs_guts.h"
25 #include "devextras.h"
26
27 #include <sys/types.h>
28 #include <sys/stat.h>
29 #include <fcntl.h>
30 #include <unistd.h>
31
32 #include "yaffs_fileem2k.h"
33 #include "yaffs_packedtags2.h"
34
35
36
37 typedef struct
38 {
39 __u8 data[PAGE_SIZE]; // Data + spare
40 } yflash_Page;
41
42 typedef struct
43 {
44 yflash_Page page[PAGES_PER_BLOCK]; // The pages in the block
45
46 } yflash_Block;
47
48
49
50 #define MAX_HANDLES 20
51 #define BLOCKS_PER_HANDLE 8000
52
53 typedef struct
54 {
55 int handle[MAX_HANDLES];
56 int nBlocks;
57 } yflash_Device;
58
59 static yflash_Device filedisk;
60
61 int yaffs_testPartialWrite = 0;
62
63
NToName(char * buf,int n)64 static char *NToName(char *buf,int n)
65 {
66 sprintf(buf,"emfile%d",n);
67 return buf;
68 }
69
70 static char dummyBuffer[BLOCK_SIZE];
71
GetBlockFileHandle(int n)72 static int GetBlockFileHandle(int n)
73 {
74 int h;
75 int requiredSize;
76
77 char name[40];
78 NToName(name,n);
79 int fSize;
80 int i;
81
82 h = open(name, O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
83 if(h >= 0){
84 fSize = lseek(h,0,SEEK_END);
85 requiredSize = BLOCKS_PER_HANDLE * BLOCK_SIZE;
86 if(fSize < requiredSize){
87 for(i = 0; i < BLOCKS_PER_HANDLE; i++)
88 if(write(h,dummyBuffer,BLOCK_SIZE) != BLOCK_SIZE)
89 return -1;
90
91 }
92 }
93
94 return h;
95
96 }
97
CheckInit(void)98 static int CheckInit(void)
99 {
100 static int initialised = 0;
101 int h;
102 int i;
103
104
105 off_t fSize;
106 off_t requiredSize;
107 int written;
108 int blk;
109
110 yflash_Page p;
111
112 if(initialised)
113 {
114 return YAFFS_OK;
115 }
116
117 initialised = 1;
118
119 memset(dummyBuffer,0xff,sizeof(dummyBuffer));
120
121
122 filedisk.nBlocks = SIZE_IN_MB * BLOCKS_PER_MB;
123
124 for(i = 0; i < MAX_HANDLES; i++)
125 filedisk.handle[i] = -1;
126
127 for(i = 0,blk = 0; blk < filedisk.nBlocks; blk+=BLOCKS_PER_HANDLE,i++)
128 filedisk.handle[i] = GetBlockFileHandle(i);
129
130
131 return 1;
132 }
133
134
yflash_GetNumberOfBlocks(void)135 int yflash_GetNumberOfBlocks(void)
136 {
137 CheckInit();
138
139 return filedisk.nBlocks;
140 }
141
yflash_WriteChunkWithTagsToNAND(yaffs_Device * dev,int chunkInNAND,const __u8 * data,yaffs_ExtendedTags * tags)142 int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags)
143 {
144 int written;
145 int pos;
146 int h;
147
148 CheckInit();
149
150
151
152 if(data)
153 {
154 pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
155 h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
156
157 lseek(h,pos,SEEK_SET);
158 written = write(h,data,dev->nDataBytesPerChunk);
159
160 if(yaffs_testPartialWrite){
161 close(h);
162 exit(1);
163 }
164
165 if(written != dev->nDataBytesPerChunk) return YAFFS_FAIL;
166 }
167
168 if(tags)
169 {
170 pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE ;
171 h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
172
173 lseek(h,pos,SEEK_SET);
174 if( 0 && dev->isYaffs2)
175 {
176
177 written = write(h,tags,sizeof(yaffs_ExtendedTags));
178 if(written != sizeof(yaffs_ExtendedTags)) return YAFFS_FAIL;
179 }
180 else
181 {
182 yaffs_PackedTags2 pt;
183 yaffs_PackTags2(&pt,tags);
184
185 written = write(h,&pt,sizeof(pt));
186 if(written != sizeof(pt)) return YAFFS_FAIL;
187 }
188 }
189
190
191 return YAFFS_OK;
192
193 }
194
yaffs_CheckAllFF(const __u8 * ptr,int n)195 int yaffs_CheckAllFF(const __u8 *ptr, int n)
196 {
197 while(n)
198 {
199 n--;
200 if(*ptr!=0xFF) return 0;
201 ptr++;
202 }
203 return 1;
204 }
205
206
207 static int fail300 = 1;
208 static int fail320 = 1;
209
yflash_ReadChunkWithTagsFromNAND(yaffs_Device * dev,int chunkInNAND,__u8 * data,yaffs_ExtendedTags * tags)210 int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
211 {
212 int nread;
213 int pos;
214 int h;
215
216 CheckInit();
217
218
219
220 if(data)
221 {
222
223 pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
224 h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
225 lseek(h,pos,SEEK_SET);
226 nread = read(h,data,dev->nDataBytesPerChunk);
227
228 if(nread != dev->nDataBytesPerChunk) return YAFFS_FAIL;
229 }
230
231 if(tags)
232 {
233 pos = (chunkInNAND % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
234 h = filedisk.handle[(chunkInNAND / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
235 lseek(h,pos,SEEK_SET);
236
237 if(0 && dev->isYaffs2)
238 {
239 nread= read(h,tags,sizeof(yaffs_ExtendedTags));
240 if(nread != sizeof(yaffs_ExtendedTags)) return YAFFS_FAIL;
241 if(yaffs_CheckAllFF((__u8 *)tags,sizeof(yaffs_ExtendedTags)))
242 {
243 yaffs_InitialiseTags(tags);
244 }
245 else
246 {
247 tags->chunkUsed = 1;
248 }
249 }
250 else
251 {
252 yaffs_PackedTags2 pt;
253 nread= read(h,&pt,sizeof(pt));
254 yaffs_UnpackTags2(tags,&pt);
255 if((chunkInNAND >> 6) == 300) {
256 if(fail300 && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR){
257 tags->eccResult = YAFFS_ECC_RESULT_FIXED;
258 fail300 = 0;
259 }
260
261 }
262 if((chunkInNAND >> 6) == 320) {
263 if(fail320 && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR){
264 tags->eccResult = YAFFS_ECC_RESULT_FIXED;
265 fail320 = 0;
266 }
267 }
268 if(nread != sizeof(pt)) return YAFFS_FAIL;
269 }
270 }
271
272
273 return YAFFS_OK;
274
275 }
276
277
yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct * dev,int blockNo)278 int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
279 {
280 int written;
281 int h;
282
283 yaffs_PackedTags2 pt;
284
285 CheckInit();
286
287 memset(&pt,0,sizeof(pt));
288 h = filedisk.handle[(blockNo / ( BLOCKS_PER_HANDLE))];
289 lseek(h,((blockNo % BLOCKS_PER_HANDLE) * dev->nChunksPerBlock) * PAGE_SIZE + PAGE_DATA_SIZE,SEEK_SET);
290 written = write(h,&pt,sizeof(pt));
291
292 if(written != sizeof(pt)) return YAFFS_FAIL;
293
294
295 return YAFFS_OK;
296
297 }
298
yflash_EraseBlockInNAND(yaffs_Device * dev,int blockNumber)299 int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
300 {
301
302 int i;
303 int h;
304
305 CheckInit();
306
307 if(blockNumber == 320)
308 fail320 = 1;
309
310 if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
311 {
312 T(YAFFS_TRACE_ALWAYS,("Attempt to erase non-existant block %d\n",blockNumber));
313 return YAFFS_FAIL;
314 }
315 else
316 {
317
318 __u8 pg[PAGE_SIZE];
319 int syz = PAGE_SIZE;
320 int pos;
321
322 memset(pg,0xff,syz);
323
324
325 h = filedisk.handle[(blockNumber / ( BLOCKS_PER_HANDLE))];
326 lseek(h,((blockNumber % BLOCKS_PER_HANDLE) * dev->nChunksPerBlock) * PAGE_SIZE,SEEK_SET);
327 for(i = 0; i < dev->nChunksPerBlock; i++)
328 {
329 write(h,pg,PAGE_SIZE);
330 }
331 pos = lseek(h, 0,SEEK_CUR);
332
333 return YAFFS_OK;
334 }
335
336 }
337
yflash_InitialiseNAND(yaffs_Device * dev)338 int yflash_InitialiseNAND(yaffs_Device *dev)
339 {
340 CheckInit();
341
342 return YAFFS_OK;
343 }
344
345
346
347
yflash_QueryNANDBlock(struct yaffs_DeviceStruct * dev,int blockNo,yaffs_BlockState * state,int * sequenceNumber)348 int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
349 {
350 yaffs_ExtendedTags tags;
351 int chunkNo;
352
353 *sequenceNumber = 0;
354
355 chunkNo = blockNo * dev->nChunksPerBlock;
356
357 yflash_ReadChunkWithTagsFromNAND(dev,chunkNo,NULL,&tags);
358 if(tags.blockBad)
359 {
360 *state = YAFFS_BLOCK_STATE_DEAD;
361 }
362 else if(!tags.chunkUsed)
363 {
364 *state = YAFFS_BLOCK_STATE_EMPTY;
365 }
366 else if(tags.chunkUsed)
367 {
368 *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
369 *sequenceNumber = tags.sequenceNumber;
370 }
371 return YAFFS_OK;
372 }
373
374