direct/basic-test/yaffs_fileem2k.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2011 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 /*
  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
  19 #include "yportenv.h"
  20 #include "yaffs_trace.h"
  21
  22 #include "yaffs_flashif2.h"
  23 #include "yaffs_guts.h"
  24 #include "yaffs_fileem2k.h"
  25 #include "yaffs_packedtags2.h"
  26
  27
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <unistd.h>
  32
  33 #define REPORT_ERROR 0
  34
  35 typedef struct
  36 {
  37         u8 data[PAGE_SIZE]; // Data + spare
  38 } yflash_Page;
  39
  40 typedef struct
  41 {
  42         yflash_Page page[PAGES_PER_BLOCK]; // The pages in the block
  43
  44 } yflash_Block;
  45
  46
  47
  48 #define MAX_HANDLES 20
  49 #define BLOCKS_PER_HANDLE (32*8)
  50
  51 typedef struct
  52 {
  53         int handle[MAX_HANDLES];
  54         int nBlocks;
  55 } yflash_Device;
  56
  57 static yflash_Device filedisk;
  58
  59 int yaffs_test_partial_write = 0;
  60
  61 extern int random_seed;
  62 extern int simulate_power_failure;
  63 static int remaining_ops;
  64 static int nops_so_far;
  65
  66 int ops_multiplier;
  67
  68
  69 static void yflash2_MaybePowerFail(unsigned int nand_chunk, int failPoint)
  70 {
  71
  72    nops_so_far++;
  73
  74
  75    remaining_ops--;
  76    if(simulate_power_failure &&
  77       remaining_ops < 1){
  78        printf("Simulated power failure after %d operations\n",nops_so_far);
  79        printf("  power failed on nand_chunk %d, at fail point %d\n",
  80                         nand_chunk, failPoint);
  81         exit(0);
  82   }
  83 }
  84
  85
  86
  87
  88
  89 static u8 localBuffer[PAGE_SIZE];
  90
  91 static char *NToName(char *buf,int n)
  92 {
  93         sprintf(buf,"emfile-2k-%d",n);
  94         return buf;
  95 }
  96
  97 static char dummyBuffer[BLOCK_SIZE];
  98
  99 static int GetBlockFileHandle(int n)
 100 {
 101         int h;
 102         int requiredSize;
 103
 104         char name[40];
 105         NToName(name,n);
 106         int fSize;
 107         int i;
 108
 109         h =  open(name, O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
 110         if(h >= 0){
 111                 fSize = lseek(h,0,SEEK_END);
 112                 requiredSize = BLOCKS_PER_HANDLE * BLOCK_SIZE;
 113                 if(fSize < requiredSize){
 114                    for(i = 0; i < BLOCKS_PER_HANDLE; i++)
 115                         if(write(h,dummyBuffer,BLOCK_SIZE) != BLOCK_SIZE)
 116                                 return -1;
 117
 118                 }
 119         }
 120
 121         return h;
 122
 123 }
 124
 125 static int  CheckInit(void)
 126 {
 127         static int initialised = 0;
 128         int i;
 129
 130         int blk;
 131
 132
 133         if(initialised)
 134         {
 135                 return YAFFS_OK;
 136         }
 137
 138         initialised = 1;
 139
 140
 141         srand(random_seed);
 142         remaining_ops = (rand() % 1000) * 5;
 143         memset(dummyBuffer,0xff,sizeof(dummyBuffer));
 144
 145
 146
 147         filedisk.nBlocks = SIZE_IN_MB * BLOCKS_PER_MB;
 148
 149         for(i = 0; i <  MAX_HANDLES; i++)
 150                 filedisk.handle[i] = -1;
 151
 152         for(i = 0,blk = 0; blk < filedisk.nBlocks; blk+=BLOCKS_PER_HANDLE,i++)
 153                 filedisk.handle[i] = GetBlockFileHandle(i);
 154
 155
 156         return 1;
 157 }
 158
 159
 160 int yflash2_GetNumberOfBlocks(void)
 161 {
 162         CheckInit();
 163
 164         return filedisk.nBlocks;
 165 }
 166
 167
 168 int yaffs_check_all_ff(const u8 *ptr, int n)
 169 {
 170         while(n)
 171         {
 172                 n--;
 173                 if(*ptr!=0xFF) return 0;
 174                 ptr++;
 175         }
 176         return 1;
 177 }
 178
 179
 180 static int yflash2_WriteChunk(struct yaffs_dev *dev, int nand_chunk,
 181                                    const u8 *data, int data_len,
 182                                    const u8 *oob, int oob_len)
 183 {
 184         int retval = YAFFS_OK;
 185         int pos;
 186         int h;
 187         int nwritten;
 188
 189         (void) dev;
 190
 191         if (data && data_len) {
 192                 pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
 193                 h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 194                 lseek(h,pos,SEEK_SET);
 195                 nwritten = write(h,data,data_len);
 196                 if(nwritten != data_len)
 197                         retval = YAFFS_FAIL;
 198         }
 199
 200         if (oob && oob_len) {
 201                 pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
 202                 h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 203                 lseek(h,pos,SEEK_SET);
 204                 nwritten = write(h,oob,oob_len);
 205                 if(nwritten != oob_len)
 206                         retval = YAFFS_FAIL;
 207         }
 208
 209         yflash2_MaybePowerFail(nand_chunk,3);
 210
 211         return retval;
 212 }
 213
 214 static int yflash2_ReadChunk(struct yaffs_dev *dev, int nand_chunk,
 215                                    u8 *data, int data_len,
 216                                    u8 *oob, int oob_len,
 217                                    enum yaffs_ecc_result *ecc_result)
 218 {
 219         int retval = YAFFS_OK;
 220         int pos;
 221         int h;
 222         int nread;
 223
 224         (void) dev;
 225
 226         if (data && data_len) {
 227                 pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE;
 228                 h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 229                 lseek(h,pos,SEEK_SET);
 230                 nread = read(h,data,data_len);
 231                 if(nread != data_len)
 232                         retval = YAFFS_FAIL;
 233         }
 234
 235         if (oob && oob_len) {
 236                 pos = (nand_chunk % (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE)) * PAGE_SIZE + PAGE_DATA_SIZE;
 237                 h = filedisk.handle[(nand_chunk / (PAGES_PER_BLOCK * BLOCKS_PER_HANDLE))];
 238                 lseek(h,pos,SEEK_SET);
 239                 nread = read(h,oob,oob_len);
 240                 if(nread != oob_len)
 241                         retval = YAFFS_FAIL;
 242         }
 243
 244         if (ecc_result)
 245                 *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
 246
 247         return retval;
 248 }
 249
 250 static int yflash2_EraseBlock(struct yaffs_dev *dev, int block_no)
 251 {
 252         int i;
 253         int h;
 254
 255         CheckInit();
 256
 257         if(block_no < 0 || block_no >= filedisk.nBlocks)
 258         {
 259                 yaffs_trace(YAFFS_TRACE_ALWAYS,"Attempt to erase non-existant block %d",block_no);
 260                 return YAFFS_FAIL;
 261         }
 262         else
 263         {
 264
 265                 u8 pg[PAGE_SIZE];
 266                 int syz = PAGE_SIZE;
 267                 int pos;
 268
 269                 memset(pg,0xff,syz);
 270
 271
 272                 h = filedisk.handle[(block_no / ( BLOCKS_PER_HANDLE))];
 273                 lseek(h,((block_no % BLOCKS_PER_HANDLE) * dev->param.chunks_per_block) * PAGE_SIZE,SEEK_SET);
 274                 for(i = 0; i < dev->param.chunks_per_block; i++)
 275                 {
 276                         write(h,pg,PAGE_SIZE);
 277                 }
 278                 pos = lseek(h, 0,SEEK_CUR);
 279
 280                 return YAFFS_OK;
 281         }
 282 }
 283
 284 static int yflash2_MarkBad(struct yaffs_dev *dev, int block_no)
 285 {
 286         int written;
 287         int h;
 288
 289         struct yaffs_packed_tags2 pt;
 290
 291         CheckInit();
 292
 293         memset(&pt,0,sizeof(pt));
 294         h = filedisk.handle[(block_no / ( BLOCKS_PER_HANDLE))];
 295         lseek(h,((block_no % BLOCKS_PER_HANDLE) * dev->param.chunks_per_block) * PAGE_SIZE + PAGE_DATA_SIZE,SEEK_SET);
 296         written = write(h,&pt,sizeof(pt));
 297
 298         if(written != sizeof(pt))
 299                 return YAFFS_FAIL;
 300
 301         return YAFFS_OK;
 302
 303 }
 304
 305 static int yflash2_CheckBad(struct yaffs_dev *dev, int block_no)
 306 {
 307         (void) dev;
 308         (void) block_no;
 309
 310         return YAFFS_OK;
 311 }
 312
 313 static int yflash2_Initialise(struct yaffs_dev *dev)
 314 {
 315         (void) dev;
 316
 317         CheckInit();
 318
 319         return YAFFS_OK;
 320 }
 321
 322 void yflash2_install_drv(struct yaffs_dev *dev)
 323 {
 324         struct yaffs_param *param = &dev->param;
 325
 326         param->drv_write_chunk_fn = yflash2_WriteChunk;
 327         param->drv_read_chunk_fn = yflash2_ReadChunk;
 328         param->drv_erase_fn = yflash2_EraseBlock;
 329         param->drv_mark_bad_fn = yflash2_MarkBad;
 330         param->drv_check_bad_fn = yflash2_CheckBad;
 331         param->drv_initialise_fn = yflash2_Initialise;
 332
 333
 334         param->total_bytes_per_chunk = 2048;
 335         param->chunks_per_block = 64;
 336         param->start_block = 0;
 337         param->end_block = yflash2_GetNumberOfBlocks()-1;
 338         param->is_yaffs2 = 1;
 339         param->use_nand_ecc=1;
 340 }