1 | /* |
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2 | * Copyright (c) 2013, 2016 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <rtems@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #ifndef RTEMS_JFFS2_H |
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16 | #define RTEMS_JFFS2_H |
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17 | |
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18 | #include <rtems/fs.h> |
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19 | #include <sys/param.h> |
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20 | #include <sys/ioccom.h> |
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21 | #include <zlib.h> |
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22 | |
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23 | #ifdef __cplusplus |
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24 | extern "C" { |
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25 | #endif /* __cplusplus */ |
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26 | |
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27 | typedef struct rtems_jffs2_flash_control rtems_jffs2_flash_control; |
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28 | |
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29 | /** |
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30 | * @defgroup JFFS2 Journalling Flash File System Version 2 (JFFS2) Support |
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31 | * |
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32 | * @ingroup FileSystemTypesAndMount |
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33 | * |
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34 | * @brief Mount options for the Journalling Flash File System, Version 2 |
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35 | * (JFFS2). |
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36 | * |
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37 | * The application must provide flash device geometry information and flash |
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38 | * device operations in the flash control structure |
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39 | * @ref rtems_jffs2_flash_control. |
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40 | * |
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41 | * The application can optionally provide a compressor control structure to |
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42 | * enable data compression using the selected compression algorithm. |
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43 | * |
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44 | * The application must enable JFFS2 support with rtems_filesystem_register() |
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45 | * or CONFIGURE_FILESYSTEM_JFFS2 via <rtems/confdefs.h>. |
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46 | * |
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47 | * An example mount with a simple memory based flash device simulation follows. |
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48 | * The zlib is used for as the compressor. |
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49 | * |
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50 | * @code |
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51 | * #include <string.h> |
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52 | * |
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53 | * #include <rtems/jffs2.h> |
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54 | * #include <rtems/libio.h> |
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55 | * |
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56 | * #define BLOCK_SIZE (32UL * 1024UL) |
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57 | * |
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58 | * #define FLASH_SIZE (32UL * BLOCK_SIZE) |
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59 | * |
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60 | * typedef struct { |
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61 | * rtems_jffs2_flash_control super; |
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62 | * unsigned char area[FLASH_SIZE]; |
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63 | * } flash_control; |
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64 | * |
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65 | * static flash_control *get_flash_control(rtems_jffs2_flash_control *super) |
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66 | * { |
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67 | * return (flash_control *) super; |
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68 | * } |
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69 | * |
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70 | * static int flash_read( |
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71 | * rtems_jffs2_flash_control *super, |
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72 | * uint32_t offset, |
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73 | * unsigned char *buffer, |
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74 | * size_t size_of_buffer |
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75 | * ) |
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76 | * { |
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77 | * flash_control *self = get_flash_control(super); |
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78 | * unsigned char *chunk = &self->area[offset]; |
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79 | * |
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80 | * memcpy(buffer, chunk, size_of_buffer); |
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81 | * |
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82 | * return 0; |
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83 | * } |
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84 | * |
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85 | * static int flash_write( |
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86 | * rtems_jffs2_flash_control *super, |
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87 | * uint32_t offset, |
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88 | * const unsigned char *buffer, |
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89 | * size_t size_of_buffer |
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90 | * ) |
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91 | * { |
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92 | * flash_control *self = get_flash_control(super); |
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93 | * unsigned char *chunk = &self->area[offset]; |
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94 | * size_t i; |
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95 | * |
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96 | * for (i = 0; i < size_of_buffer; ++i) { |
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97 | * chunk[i] &= buffer[i]; |
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98 | * } |
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99 | * |
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100 | * return 0; |
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101 | * } |
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102 | * |
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103 | * static int flash_erase( |
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104 | * rtems_jffs2_flash_control *super, |
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105 | * uint32_t offset |
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106 | * ) |
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107 | * { |
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108 | * flash_control *self = get_flash_control(super); |
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109 | * unsigned char *chunk = &self->area[offset]; |
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110 | * |
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111 | * memset(chunk, 0xff, BLOCK_SIZE); |
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112 | * |
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113 | * return 0; |
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114 | * } |
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115 | * |
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116 | * static flash_control flash_instance = { |
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117 | * .super = { |
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118 | * .block_size = BLOCK_SIZE, |
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119 | * .flash_size = FLASH_SIZE, |
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120 | * .read = flash_read, |
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121 | * .write = flash_write, |
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122 | * .erase = flash_erase, |
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123 | * .device_identifier = 0xc01dc0fe |
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124 | * } |
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125 | * }; |
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126 | * |
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127 | * static rtems_jffs2_compressor_zlib_control compressor_instance = { |
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128 | * .super = { |
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129 | * .compress = rtems_jffs2_compressor_zlib_compress, |
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130 | * .decompress = rtems_jffs2_compressor_zlib_decompress |
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131 | * } |
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132 | * }; |
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133 | * |
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134 | * static const rtems_jffs2_mount_data mount_data = { |
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135 | * .flash_control = &flash_instance.super, |
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136 | * .compressor_control = &compressor_instance.super |
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137 | * }; |
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138 | * |
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139 | * static void erase_all(void) |
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140 | * { |
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141 | * memset(&flash_instance.area[0], 0xff, FLASH_SIZE); |
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142 | * } |
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143 | * |
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144 | * void example_jffs2_mount(const char *mount_dir) |
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145 | * { |
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146 | * int rv; |
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147 | * |
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148 | * erase_all(); |
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149 | * |
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150 | * rv = mount_and_make_target_path( |
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151 | * NULL, |
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152 | * mount_dir, |
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153 | * RTEMS_FILESYSTEM_TYPE_JFFS2, |
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154 | * RTEMS_FILESYSTEM_READ_WRITE, |
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155 | * &mount_data |
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156 | * ); |
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157 | * assert(rv == 0); |
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158 | * } |
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159 | * @endcode |
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160 | * |
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161 | * @{ |
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162 | */ |
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163 | |
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164 | /** |
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165 | * @brief Read from flash operation. |
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166 | * |
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167 | * @param[in, out] self The flash control. |
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168 | * @param[in] offset The offset to read from the flash begin in bytes. |
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169 | * @param[out] buffer The buffer receiving the data. |
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170 | * @param[in] size_of_buffer The size of the buffer in bytes. |
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171 | * |
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172 | * @retval 0 Successful operation. |
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173 | * @retval -EIO An error occurred. Please note that the value is negative. |
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174 | * @retval other All other values are reserved and must not be used. |
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175 | */ |
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176 | typedef int (*rtems_jffs2_flash_read)( |
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177 | rtems_jffs2_flash_control *self, |
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178 | uint32_t offset, |
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179 | unsigned char *buffer, |
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180 | size_t size_of_buffer |
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181 | ); |
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182 | |
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183 | /** |
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184 | * @brief Write to flash operation. |
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185 | * |
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186 | * @param[in, out] self The flash control. |
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187 | * @param[in] offset The offset to write from the flash begin in bytes. |
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188 | * @param[in] buffer The buffer containing the data to write. |
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189 | * @param[in] size_of_buffer The size of the buffer in bytes. |
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190 | * |
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191 | * @retval 0 Successful operation. |
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192 | * @retval -EIO An error occurred. Please note that the value is negative. |
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193 | * @retval other All other values are reserved and must not be used. |
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194 | */ |
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195 | typedef int (*rtems_jffs2_flash_write)( |
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196 | rtems_jffs2_flash_control *self, |
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197 | uint32_t offset, |
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198 | const unsigned char *buffer, |
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199 | size_t size_of_buffer |
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200 | ); |
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201 | |
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202 | /** |
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203 | * @brief Flash erase operation. |
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204 | * |
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205 | * This operation must erase one block specified by the offset. |
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206 | * |
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207 | * @param[in, out] self The flash control. |
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208 | * @param[in] offset The offset to erase from the flash begin in bytes. |
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209 | * |
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210 | * @retval 0 Successful operation. |
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211 | * @retval -EIO An error occurred. Please note that the value is negative. |
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212 | * @retval other All other values are reserved and must not be used. |
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213 | */ |
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214 | typedef int (*rtems_jffs2_flash_erase)( |
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215 | rtems_jffs2_flash_control *self, |
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216 | uint32_t offset |
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217 | ); |
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218 | |
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219 | /** |
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220 | * @brief Flash destroy operation. |
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221 | * |
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222 | * The flash destroy operation is called during unmount of the file system |
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223 | * instance. It can be used to free the resources associated with the now |
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224 | * unused flash control |
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225 | * |
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226 | * @param[in, out] self The flash control. |
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227 | */ |
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228 | typedef void (*rtems_jffs2_flash_destroy)( |
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229 | rtems_jffs2_flash_control *self |
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230 | ); |
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231 | |
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232 | /** |
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233 | * @brief Trigger garbage collection operation. |
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234 | * |
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235 | * An optional garbage collection thread may perform now a garbage collection |
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236 | * using the RTEMS_JFFS2_ON_DEMAND_GARBAGE_COLLECTION IO control. |
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237 | * |
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238 | * The garbage collection must not run in the executing context. |
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239 | * |
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240 | * @param[in] self The flash control. |
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241 | */ |
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242 | typedef void (*rtems_jffs2_trigger_garbage_collection)( |
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243 | rtems_jffs2_flash_control *self |
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244 | ); |
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245 | |
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246 | /** |
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247 | * @brief JFFS2 flash device control. |
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248 | */ |
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249 | struct rtems_jffs2_flash_control { |
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250 | /** |
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251 | * @brief The size in bytes of the erasable unit of the flash device. |
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252 | */ |
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253 | uint32_t block_size; |
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254 | |
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255 | /** |
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256 | * @brief The size in bytes of the flash device. |
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257 | * |
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258 | * It must be an integral multiple of the block size. The flash device must |
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259 | * have at least five blocks. |
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260 | */ |
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261 | uint32_t flash_size; |
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262 | |
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263 | /** |
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264 | * @brief Read from flash operation. |
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265 | */ |
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266 | rtems_jffs2_flash_read read; |
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267 | |
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268 | /** |
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269 | * @brief Write to flash operation. |
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270 | */ |
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271 | rtems_jffs2_flash_write write; |
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272 | |
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273 | /** |
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274 | * @brief Flash erase operation. |
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275 | */ |
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276 | rtems_jffs2_flash_erase erase; |
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277 | |
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278 | /** |
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279 | * @brief Flash destroy operation. |
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280 | * |
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281 | * This operation is optional and the pointer may be @c NULL. |
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282 | */ |
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283 | rtems_jffs2_flash_destroy destroy; |
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284 | |
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285 | /** |
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286 | * @brief The device identifier of the flash device. |
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287 | * |
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288 | * It is used in combination with the inode number to uniquely identify a |
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289 | * file system node in the system. |
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290 | */ |
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291 | dev_t device_identifier; |
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292 | |
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293 | /** |
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294 | * @brief Trigger garbage collection operation. |
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295 | * |
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296 | * This operation is optional and may be NULL. This operation should wake up |
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297 | * a garbage collection thread. The garbage collection thread should use the |
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298 | * RTEMS_JFFS2_ON_DEMAND_GARBAGE_COLLECTION IO control to carry out the work. |
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299 | */ |
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300 | rtems_jffs2_trigger_garbage_collection trigger_garbage_collection; |
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301 | }; |
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302 | |
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303 | typedef struct rtems_jffs2_compressor_control rtems_jffs2_compressor_control; |
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304 | |
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305 | /** |
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306 | * @brief Compress operation. |
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307 | * |
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308 | * @param[in, out] self The compressor control. |
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309 | * @param[in] data_in The uncompressed data. |
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310 | * @param[out] cdata_out Pointer to buffer with the compressed data. |
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311 | * @param[in, out] datalen On entry, the size in bytes of the uncompressed |
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312 | * data. On exit, the size in bytes of uncompressed data which was actually |
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313 | * compressed. |
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314 | * @param[in, out] cdatalen On entry, the size in bytes available for |
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315 | * compressed data. On exit, the size in bytes of the actually compressed |
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316 | * data. |
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317 | * |
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318 | * @return The compressor type. |
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319 | */ |
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320 | typedef uint16_t (*rtems_jffs2_compressor_compress)( |
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321 | rtems_jffs2_compressor_control *self, |
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322 | unsigned char *data_in, |
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323 | unsigned char *cdata_out, |
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324 | uint32_t *datalen, |
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325 | uint32_t *cdatalen |
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326 | ); |
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327 | |
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328 | /** |
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329 | * @brief Decompress operation. |
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330 | * |
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331 | * @param[in, out] self The compressor control. |
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332 | * @param[in] comprtype The compressor type. |
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333 | * @param[in] cdata_in The compressed data. |
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334 | * @param[out] data_out The uncompressed data. |
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335 | * @param[in] cdatalen The size in bytes of the compressed data. |
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336 | * @param[in] datalen The size in bytes of the uncompressed data. |
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337 | * |
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338 | * @retval 0 Successful operation. |
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339 | * @retval -EIO An error occurred. Please note that the value is negative. |
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340 | * @retval other All other values are reserved and must not be used. |
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341 | */ |
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342 | typedef int (*rtems_jffs2_compressor_decompress)( |
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343 | rtems_jffs2_compressor_control *self, |
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344 | uint16_t comprtype, |
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345 | unsigned char *cdata_in, |
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346 | unsigned char *data_out, |
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347 | uint32_t cdatalen, |
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348 | uint32_t datalen |
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349 | ); |
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350 | |
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351 | /** |
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352 | * @brief Compressor destroy operation. |
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353 | * |
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354 | * The compressor destroy operation is called during unmount of the file system |
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355 | * instance. It can be used to free the resources associated with the now |
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356 | * unused compressor operations. |
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357 | * |
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358 | * @param[in, out] self The compressor control. |
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359 | */ |
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360 | typedef void (*rtems_jffs2_compressor_destroy)( |
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361 | rtems_jffs2_compressor_control *self |
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362 | ); |
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363 | |
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364 | /** |
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365 | * @brief JFFS2 compressor control. |
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366 | */ |
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367 | struct rtems_jffs2_compressor_control { |
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368 | /** |
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369 | * @brief Compress operation. |
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370 | */ |
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371 | rtems_jffs2_compressor_compress compress; |
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372 | |
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373 | /** |
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374 | * @brief Decompress operation. |
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375 | */ |
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376 | rtems_jffs2_compressor_decompress decompress; |
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377 | |
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378 | /** |
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379 | * @brief Compressor destroy operation. |
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380 | * |
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381 | * This operation is optional and the pointer may be @c NULL. |
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382 | */ |
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383 | rtems_jffs2_compressor_destroy destroy; |
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384 | |
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385 | /** |
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386 | * @brief Compression buffer. |
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387 | */ |
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388 | unsigned char buffer[PAGE_SIZE]; |
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389 | }; |
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390 | |
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391 | /** |
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392 | * @brief RTIME compressor compress operation. |
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393 | */ |
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394 | uint16_t rtems_jffs2_compressor_rtime_compress( |
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395 | rtems_jffs2_compressor_control *self, |
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396 | unsigned char *data_in, |
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397 | unsigned char *cdata_out, |
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398 | uint32_t *datalen, |
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399 | uint32_t *cdatalen |
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400 | ); |
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401 | |
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402 | /** |
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403 | * @brief RTIME compressor decompress operation. |
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404 | */ |
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405 | int rtems_jffs2_compressor_rtime_decompress( |
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406 | rtems_jffs2_compressor_control *self, |
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407 | uint16_t comprtype, |
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408 | unsigned char *cdata_in, |
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409 | unsigned char *data_out, |
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410 | uint32_t cdatalen, |
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411 | uint32_t datalen |
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412 | ); |
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413 | |
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414 | /** |
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415 | * @brief ZLIB compressor control structure. |
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416 | */ |
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417 | typedef struct { |
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418 | rtems_jffs2_compressor_control super; |
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419 | z_stream stream; |
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420 | } rtems_jffs2_compressor_zlib_control; |
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421 | |
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422 | /** |
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423 | * @brief ZLIB compressor compress operation. |
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424 | */ |
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425 | uint16_t rtems_jffs2_compressor_zlib_compress( |
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426 | rtems_jffs2_compressor_control *self, |
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427 | unsigned char *data_in, |
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428 | unsigned char *cdata_out, |
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429 | uint32_t *datalen, |
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430 | uint32_t *cdatalen |
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431 | ); |
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432 | |
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433 | /** |
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434 | * @brief ZLIB compressor decompress operation. |
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435 | */ |
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436 | int rtems_jffs2_compressor_zlib_decompress( |
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437 | rtems_jffs2_compressor_control *self, |
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438 | uint16_t comprtype, |
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439 | unsigned char *cdata_in, |
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440 | unsigned char *data_out, |
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441 | uint32_t cdatalen, |
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442 | uint32_t datalen |
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443 | ); |
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444 | |
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445 | /** |
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446 | * @brief JFFS2 mount options. |
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447 | * |
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448 | * For JFFS2 the mount options are mandatory. |
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449 | */ |
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450 | typedef struct { |
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451 | /** |
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452 | * @brief Flash control. |
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453 | */ |
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454 | rtems_jffs2_flash_control *flash_control; |
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455 | |
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456 | /** |
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457 | * @brief Compressor control. |
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458 | * |
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459 | * The compressor is optional and this pointer may be @c NULL. |
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460 | */ |
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461 | rtems_jffs2_compressor_control *compressor_control; |
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462 | } rtems_jffs2_mount_data; |
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463 | |
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464 | /** |
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465 | * @brief Initialization handler of the JFFS2 file system. |
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466 | * |
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467 | * @param[in, out] mt_entry The mount table entry. |
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468 | * @param[in] data The mount options are mandatory for JFFS2 and data must |
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469 | * point to a valid @ref rtems_jffs2_mount_data structure used for this file |
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470 | * system instance. |
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471 | * |
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472 | * @retval 0 Successful operation. |
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473 | * @retval -1 An error occurred. The @c errno indicates the error. |
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474 | * |
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475 | * @see mount(). |
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476 | */ |
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477 | int rtems_jffs2_initialize( |
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478 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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479 | const void *data |
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480 | ); |
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481 | |
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482 | /** |
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483 | * @brief JFFS2 filesystem instance information. |
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484 | * |
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485 | * @see RTEMS_JFFS2_GET_INFO. |
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486 | */ |
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487 | typedef struct { |
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488 | /** |
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489 | * @brief Flash size in bytes. |
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490 | */ |
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491 | uint32_t flash_size; |
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492 | |
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493 | /** |
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494 | * @brief Count of flash blocks (erasable units). |
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495 | */ |
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496 | uint32_t flash_blocks; |
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497 | |
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498 | /** |
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499 | * @brief Size of a flash block in bytes. |
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500 | */ |
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501 | uint32_t flash_block_size; |
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502 | |
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503 | /** |
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504 | * @brief Used size in bytes. |
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505 | * |
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506 | * Used areas contain valid data. |
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507 | */ |
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508 | uint32_t used_size; |
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509 | |
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510 | /** |
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511 | * @brief Dirty size in bytes. |
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512 | * |
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513 | * Used areas contain no longer used data. |
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514 | */ |
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515 | uint32_t dirty_size; |
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516 | |
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517 | /** |
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518 | * @brief Wasted size in bytes. |
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519 | * |
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520 | * Wasted areas are unusable. |
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521 | */ |
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522 | uint32_t wasted_size; |
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523 | |
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524 | /** |
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525 | * @brief Free size in bytes. |
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526 | * |
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527 | * Free areas may be used to store new data. |
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528 | */ |
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529 | uint32_t free_size; |
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530 | |
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531 | /** |
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532 | * @brief Bad size in bytes. |
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533 | * |
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534 | * Bad areas indicate damaged flash blocks. |
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535 | */ |
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536 | uint32_t bad_size; |
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537 | |
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538 | /** |
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539 | * @brief Count of clean blocks. |
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540 | * |
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541 | * Clean blocks contain only used areas. |
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542 | */ |
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543 | uint32_t clean_blocks; |
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544 | |
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545 | /** |
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546 | * @brief Count of dirty blocks. |
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547 | * |
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548 | * Dirty blocks contain dirty and used areas. |
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549 | */ |
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550 | uint32_t dirty_blocks; |
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551 | |
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552 | /** |
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553 | * @brief Count of erasable blocks. |
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554 | * |
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555 | * Erase blocks contain only dirty or wasted areas. |
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556 | */ |
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557 | uint32_t erasable_blocks; |
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558 | |
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559 | /** |
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560 | * @brief Count of free blocks. |
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561 | * |
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562 | * Free blocks contain a free area. |
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563 | */ |
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564 | uint32_t free_blocks; |
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565 | |
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566 | /** |
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567 | * @brief Count of bad blocks. |
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568 | * |
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569 | * Bad blocks are damaged. |
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570 | */ |
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571 | uint32_t bad_blocks; |
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572 | } rtems_jffs2_info; |
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573 | |
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574 | /** |
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575 | * @brief IO control to get the JFFS2 filesystem instance information. |
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576 | * |
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577 | * @see rtems_jffs2_info. |
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578 | */ |
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579 | #define RTEMS_JFFS2_GET_INFO _IOR('F', 1, rtems_jffs2_info) |
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580 | |
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581 | /** |
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582 | * @brief IO control to perform an on demand garbage collection in a JFFS2 |
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583 | * filesystem instance. |
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584 | * |
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585 | * This operation is intended to be used by an optional garbage collection |
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586 | * thread. See rtems_jffs2_flash_control::trigger_garbage_collection. |
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587 | */ |
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588 | #define RTEMS_JFFS2_ON_DEMAND_GARBAGE_COLLECTION _IO('F', 2) |
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589 | |
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590 | /** |
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591 | * @brief IO control to force a garbage collection in a JFFS2 filesystem |
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592 | * instance. |
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593 | * |
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594 | * Use this operation with care since it may wear out your flash. |
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595 | */ |
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596 | #define RTEMS_JFFS2_FORCE_GARBAGE_COLLECTION _IO('F', 3) |
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597 | |
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598 | /** @} */ |
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599 | |
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600 | #ifdef __cplusplus |
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601 | } |
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602 | #endif /* __cplusplus */ |
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603 | |
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604 | #endif /* RTEMS_JFFS2_H */ |
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