direct/test-framework/yaffs_fileem.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2018 Aleph One Ltd.
   5  *
   6  * Created by Charles Manning <charles@aleph1.co.uk>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 /*
  14  * This provides a YAFFS nand emulation on a file.
  15  * This is only intended as test code to test persistence etc.
  16  */
  17
  18 #include "yportenv.h"
  19 #include "yaffs_trace.h"
  20
  21 #include "yaffs_flashif.h"
  22 #include "yaffs_guts.h"
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28
  29
  30
  31 #define SIZE_IN_MB 16
  32
  33 #define BLOCK_SIZE (32 * 528)
  34 #define BLOCKS_PER_MEG ((1024*1024)/(32 * 512))
  35
  36
  37
  38 typedef struct
  39 {
  40         u8 data[528]; // Data + spare
  41 } yflash_Page;
  42
  43 typedef struct
  44 {
  45         yflash_Page page[32]; // The pages in the block
  46
  47 } yflash_Block;
  48
  49
  50
  51 typedef struct
  52 {
  53         int handle;
  54         int nBlocks;
  55 } yflash_Device;
  56
  57 static yflash_Device filedisk;
  58
  59 static int  CheckInit(struct yaffs_dev *dev)
  60 {
  61         static int initialised = 0;
  62         int i;
  63         int fSize;
  64         int written;
  65
  66         yflash_Page p;
  67
  68         (void)dev;
  69
  70         if(initialised)
  71         {
  72                 return YAFFS_OK;
  73         }
  74
  75         initialised = 1;
  76
  77
  78         filedisk.nBlocks = (SIZE_IN_MB * 1024 * 1024)/(16 * 1024);
  79
  80         filedisk.handle = open("emfile-512-0", O_RDWR | O_CREAT, S_IREAD | S_IWRITE);
  81
  82         if(filedisk.handle < 0)
  83         {
  84                 perror("Failed to open yaffs emulation file");
  85                 return YAFFS_FAIL;
  86         }
  87
  88
  89         fSize = lseek(filedisk.handle,0,SEEK_END);
  90
  91         if(fSize < SIZE_IN_MB * 1024 * 1024)
  92         {
  93                 printf("Creating yaffs emulation file\n");
  94
  95                 lseek(filedisk.handle,0,SEEK_SET);
  96
  97                 memset(&p,0xff,sizeof(yflash_Page));
  98
  99                 for(i = 0; i < SIZE_IN_MB * 1024 * 1024; i+= 512)
 100                 {
 101                         written = write(filedisk.handle,&p,sizeof(yflash_Page));
 102
 103                         if(written != sizeof(yflash_Page))
 104                         {
 105                                 printf("Write failed\n");
 106                                 return YAFFS_FAIL;
 107                         }
 108                 }
 109         }
 110
 111         return 1;
 112 }
 113
 114 int yflash_WriteChunkToNAND(struct yaffs_dev *dev,int nand_chunk,const u8 *data, const struct yaffs_spare *spare)
 115 {
 116         int written;
 117
 118         CheckInit(dev);
 119
 120         if(data)
 121         {
 122                 lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
 123                 written = write(filedisk.handle,data,512);
 124
 125                 if(written != 512) return YAFFS_FAIL;
 126         }
 127
 128         if(spare)
 129         {
 130                 lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
 131                 written = write(filedisk.handle,spare,16);
 132
 133                 if(written != 16) return YAFFS_FAIL;
 134         }
 135
 136
 137         return YAFFS_OK;
 138
 139 }
 140
 141
 142 int yflash_ReadChunkFromNAND(struct yaffs_dev *dev,int nand_chunk, u8 *data, struct yaffs_spare *spare)
 143 {
 144         int nread;
 145
 146         CheckInit(dev);
 147
 148         if(data)
 149         {
 150                 lseek(filedisk.handle,nand_chunk * 528,SEEK_SET);
 151                 nread = read(filedisk.handle,data,512);
 152
 153                 if(nread != 512) return YAFFS_FAIL;
 154         }
 155
 156         if(spare)
 157         {
 158                 lseek(filedisk.handle,nand_chunk * 528 + 512,SEEK_SET);
 159                 nread= read(filedisk.handle,spare,16);
 160
 161                 if(nread != 16) return YAFFS_FAIL;
 162         }
 163
 164
 165         return YAFFS_OK;
 166
 167 }
 168
 169
 170 int yflash_EraseBlockInNAND(struct yaffs_dev *dev, int blockNumber)
 171 {
 172         int i;
 173
 174         CheckInit(dev);
 175
 176         if(blockNumber < 0 || blockNumber >= filedisk.nBlocks)
 177         {
 178                 yaffs_trace(YAFFS_TRACE_ALWAYS,
 179                         "Attempt to erase non-existant block %d\n",
 180                         blockNumber);
 181                 return YAFFS_FAIL;
 182         }
 183         else
 184         {
 185
 186                 yflash_Page pg;
 187
 188                 memset(&pg,0xff,sizeof(yflash_Page));
 189
 190                 lseek(filedisk.handle, blockNumber * 32 * 528, SEEK_SET);
 191
 192                 for(i = 0; i < 32; i++)
 193                 {
 194                         write(filedisk.handle,&pg,528);
 195                 }
 196                 return YAFFS_OK;
 197         }
 198
 199 }
 200
 201 int yflash_InitialiseNAND(struct yaffs_dev *dev)
 202 {
 203         (void) dev;
 204
 205         return YAFFS_OK;
 206 }
 207
 208