2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
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3 * All rights reserved.
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5 * Redistribution and use in source and binary forms, with or without
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6 * modification, are permitted provided that the following conditions
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9 * - Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 * - Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 * - The name of the author may not be used to endorse or promote products
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15 * derived from this software without specific prior written permission.
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17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 /** @addtogroup lwext4
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34 * @brief Ext4 high level operations (files, directories, mount points...).
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35 * Client has to include only this file.
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41 #include "ext4_config.h"
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42 #include "ext4_blockdev.h"
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46 /********************************FILE OPEN FLAGS*****************************/
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61 #define O_CREAT 0100
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69 #define O_TRUNC 01000
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73 #define O_APPEND 02000
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76 /********************************FILE SEEK FLAGS*****************************/
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90 /********************************OS LOCK INFERFACE***************************/
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92 /**@brief OS dependent lock interface.*/
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95 /**@brief Lock access to mount point*/
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98 /**@brief Unlock access to mount point*/
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99 void (*unlock)(void);
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102 /********************************FILE DESCRIPTOR*****************************/
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104 /**@brief File descriptor*/
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105 typedef struct ext4_file {
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107 /**@brief Mount point handle.*/
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108 struct ext4_mountpoint *mp;
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110 /**@brief File inode id*/
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113 /**@brief Open flags.*/
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116 /**@brief File size.*/
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119 /**@brief File position*/
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123 /*****************************DIRECTORY DESCRIPTOR***************************/
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124 /**@brief Directory entry types. Copy from ext4_types.h*/
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126 EXT4_DIRENTRY_UNKNOWN = 0,
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127 EXT4_DIRENTRY_REG_FILE,
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129 EXT4_DIRENTRY_CHRDEV,
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130 EXT4_DIRENTRY_BLKDEV,
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131 EXT4_DIRENTRY_FIFO,
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132 EXT4_DIRENTRY_SOCK,
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133 EXT4_DIRENTRY_SYMLINK
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136 /**@brief Directory entry descriptor. Copy from ext4_types.h*/
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139 uint16_t entry_length;
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140 uint8_t name_length;
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141 uint8_t inode_type;
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146 /**@brief File descriptor*/
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148 /**@brief Current directory entry.*/
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150 /**@brief Next entry offset*/
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154 /********************************MOUNT OPERATIONS****************************/
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156 /**@brief Register a block device to a name.
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157 * @warning Block device has to be filled by
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158 * @ref EXT4_BLOCKDEV_STATIC_INSTANCE. Block cache may be created
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159 * @ref EXT4_BCACHE_STATIC_INSTANCE.
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160 * Block cache may by created automatically when bc parameter is 0.
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161 * @param bd block device
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162 * @param bd block device cache (0 = automatic cache mode)
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163 * @param dev_name register name
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164 * @param standard error code*/
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165 int ext4_device_register(struct ext4_blockdev *bd, struct ext4_bcache *bc,
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166 const char *dev_name);
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168 /**@brief Mount a block device with EXT4 partition to the mount point.
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169 * @param dev_name block device name (@ref ext4_device_register)
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170 * @param mount_point mount point, for example
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173 * - /my_second_partition/
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175 * @return standard error code */
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176 int ext4_mount(const char *dev_name, const char *mount_point);
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178 /**@brief Umount operation.
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179 * @param mount_point mount name
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180 * @return standard error code */
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181 int ext4_umount(const char *mount_point);
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183 /**@brief Some of the filesystem stats.*/
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184 struct ext4_mount_stats {
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185 uint32_t inodes_count;
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186 uint32_t free_inodes_count;
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187 uint64_t blocks_count;
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188 uint64_t free_blocks_count;
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190 uint32_t block_size;
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191 uint32_t block_group_count;
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192 uint32_t blocks_per_group;
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193 uint32_t inodes_per_group;
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195 char volume_name[16];
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198 /**@brief Get file system params.
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199 * @param mount_point mount path
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200 * @param stats ext fs stats
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201 * @return standard error code */
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202 int ext4_mount_point_stats(const char *mount_point,
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203 struct ext4_mount_stats *stats);
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205 /**@brief Setup OS lock routines.
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206 * @param mount_point mount path
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207 * @param locks - lock and unlock functions
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208 * @return standard error code */
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209 int ext4_mount_setup_locks(const char *mount_point,
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210 const struct ext4_lock *locks);
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212 /**@brief Enable/disable write back cache mode.
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213 * @warning Default model of cache is write trough. It means that when You do:
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217 * < --- data is flushed to physical drive
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220 * ext4_cache_write_back(..., 1);
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223 * < --- data is NOT flushed to physical drive
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224 * ext4_cache_write_back(..., 0);
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225 * < --- when write back mode is disabled all
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226 * cache data will be flushed
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227 * To enable write back mode permanently just call this function
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228 * once after ext4_mount (and disable before ext4_umount).
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230 * Some of the function use write back cache mode internally.
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231 * If you enable write back mode twice you have to disable it twice
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232 * to flush all data:
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234 * ext4_cache_write_back(..., 1);
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235 * ext4_cache_write_back(..., 1);
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237 * ext4_cache_write_back(..., 0);
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238 * ext4_cache_write_back(..., 0);
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240 * Write back mode is useful when you want to create a lot of empty
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241 * files/directories.
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243 * @param path mount point path
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244 * @param on enable/disable
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246 * @return standard error code */
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247 int ext4_cache_write_back(const char *path, bool on);
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249 /********************************FILE OPERATIONS*****************************/
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251 /**@brief Remove file by path.
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252 * @param path path to file
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253 * @return standard error code */
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254 int ext4_fremove(const char *path);
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256 /**@brief File open function.
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257 * @param filename, (has to start from mount point)
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258 * /my_partition/my_file
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259 * @param flags open file flags
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260 * |---------------------------------------------------------------|
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261 * | r or rb O_RDONLY |
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262 * |---------------------------------------------------------------|
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263 * | w or wb O_WRONLY|O_CREAT|O_TRUNC |
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264 * |---------------------------------------------------------------|
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265 * | a or ab O_WRONLY|O_CREAT|O_APPEND |
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266 * |---------------------------------------------------------------|
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267 * | r+ or rb+ or r+b O_RDWR |
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268 * |---------------------------------------------------------------|
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269 * | w+ or wb+ or w+b O_RDWR|O_CREAT|O_TRUNC |
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270 * |---------------------------------------------------------------|
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271 * | a+ or ab+ or a+b O_RDWR|O_CREAT|O_APPEND |
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272 * |---------------------------------------------------------------|
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274 * @return standard error code*/
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275 int ext4_fopen(ext4_file *f, const char *path, const char *flags);
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277 /**@brief File close function.
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278 * @param f file handle
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279 * @return standard error code*/
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280 int ext4_fclose(ext4_file *f);
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282 /**@brief Read data from file.
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283 * @param f file handle
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284 * @param buf output buffer
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285 * @param size bytes to read
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286 * @param rcnt bytes read (may be NULL)
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287 * @return standard error code*/
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288 int ext4_fread(ext4_file *f, void *buf, uint32_t size, uint32_t *rcnt);
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290 /**@brief Write data to file.
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291 * @param f file handle
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292 * @param buf data to write
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293 * @param size write length
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294 * @param wcnt bytes written (may be NULL)
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295 * @return standard error code*/
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296 int ext4_fwrite(ext4_file *f, const void *buf, uint32_t size, uint32_t *wcnt);
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298 /**@brief File seek operation.
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299 * @param f file handle
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300 * @param offset offset to seek
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301 * @param origin seek type:
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305 * @return standard error code*/
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306 int ext4_fseek(ext4_file *f, uint64_t offset, uint32_t origin);
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308 /**@brief Get file position.
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309 * @param f file handle
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310 * @return actual file position */
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311 uint64_t ext4_ftell(ext4_file *f);
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313 /**@brief Get file size.
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314 * @param f file handle
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315 * @return file size */
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316 uint64_t ext4_fsize(ext4_file *f);
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318 /*********************************DIRECTORY OPERATION***********************/
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320 /**@brief Recursive directory remove.
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321 * @param path directory path to remove
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322 * @return standard error code*/
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323 int ext4_dir_rm(const char *path);
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325 /**@brief Create new directory.
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326 * @param name new directory name
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327 * @return standard error code*/
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328 int ext4_dir_mk(const char *path);
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330 /**@brief Directory open.
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331 * @param d directory handle
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332 * @param path directory path
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333 * @return standard error code*/
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334 int ext4_dir_open(ext4_dir *d, const char *path);
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336 /**@brief Directory close.
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337 * @param d directory handle
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338 * @return standard error code*/
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339 int ext4_dir_close(ext4_dir *d);
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341 /**@brief Return next directory entry.
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342 * @param d directory handle
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343 * @param id entry id
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344 * @return directory entry id (NULL if no entry)*/
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345 ext4_direntry *ext4_dir_entry_next(ext4_dir *d);
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347 #endif /* EXT4_H_ */
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