Changeset 188 for trunk/kernel/vfs/fatfs.h
- Timestamp:
- Jul 12, 2017, 8:12:41 PM (7 years ago)
- File:
-
- 1 edited
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trunk/kernel/vfs/fatfs.h (modified) (4 diffs)
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trunk/kernel/vfs/fatfs.h
r23 r188 160 160 typedef struct fatfs_ctx_s 161 161 { 162 uint32_t fat_sectors_count; /*! number of sectors in FAT region */ 163 uint32_t bytes_per_sector; /*! number of bytes per sector */ 164 uint32_t sectors_per_cluster; /*! number of sectors per cluster */ 162 165 uint32_t fat_begin_lba; /*! lba of FAT region */ 163 uint32_t fat_sectors_count; /*! number of sectors in FAT region */164 uint32_t bytes_per_sector; /*! */165 uint32_t bytes_per_cluster; /*! */166 166 uint32_t cluster_begin_lba; /*! lba of data region */ 167 uint32_t sectors_per_cluster; /*! cluster index for root directory */ 168 uint32_t root_dir_cluster; /*! */ 167 uint32_t root_dir_cluster; /*! cluster index for the root directory */ 169 168 uint32_t last_allocated_sector; /*! TODO ??? */ 170 169 uint32_t last_allocated_index; /*! TODO ??? */ … … 173 172 fatfs_ctx_t; 174 173 175 /*****************************************************************************************176 * This structure defines the FATFS specific inode (extension to VFS inode).177 ****************************************************************************************/178 179 typedef struct fatfs_inode_s180 {181 uint32_t first_cluster; /*! first cluster for this file/dir */182 }183 fatfs_inode_t;184 185 186 187 188 174 ////////////////////////////////////////////////////////////////////////////////////////// 189 // These functions are specific to the FATFS, and cannot be called by the VFS. 175 // Generic API: These functions are called by the kernel, 176 // and must be implemented by all File Systems. 190 177 ////////////////////////////////////////////////////////////////////////////////////////// 191 178 192 /***************************************************************************************** 193 * This function returns the LBA of the first sector of a FAT cluster. 194 * This function can be called by any thread running in any cluster. 195 ***************************************************************************************** 196 * @ ctx : pointer on FATFS context. 197 * @ cluster : cluster index in FATFS. 198 * @ return the lba value. 199 ****************************************************************************************/ 200 inline uint32_t fatfs_lba_from_cluster( fatfs_ctx_t * ctx, 201 uint32_t cluster ); 179 /****************************************************************************************** 180 * This fuction allocates memory from local cluster for a FATFS context descriptor. 181 ****************************************************************************************** 182 * @ return a pointer on the created context / return NULL if failure. 183 *****************************************************************************************/ 184 fatfs_ctx_t * fatfs_ctx_alloc(); 185 186 /***************************************************************************************** 187 * This function access the external boot device, and initialises it 188 * from informations contained in the boot record. 189 ***************************************************************************************** 190 * @ vfs_ctx : local pointer on VFS context for FATFS. 191 ****************************************************************************************/ 192 void fatfs_ctx_init( fatfs_ctx_t * fatfs_ctx ); 193 194 /***************************************************************************************** 195 * This function releases memory dynamically allocated for the FATFS context extension. 196 ***************************************************************************************** 197 * @ vfs_ctx : local pointer on VFS context. 198 ****************************************************************************************/ 199 void fatfs_ctx_destroy( fatfs_ctx_t * fatfs_ctx ); 200 201 /***************************************************************************************** 202 * This function moves a page from the mapper to the FATFS file system on device. 203 * It must be called by a thread running in cluster containing the mapper. 204 * The pointer on the mapper and the page index in file are registered 205 * in the page descriptor. 206 ***************************************************************************************** 207 * @ page : local pointer on page descriptor. 208 * @ return 0 if success / return EIO if error. 209 ****************************************************************************************/ 210 error_t fatfs_write_page( struct page_s * page ); 211 212 /***************************************************************************************** 213 * This function moves a page from the FATFS file system on device to the mapper. 214 * It must be called by a thread running in cluster containing the mapper. 215 * The pointer on the mapper and the page index in file are registered 216 * in the page descriptor. 217 ***************************************************************************************** 218 * @ page : local pointer on page descriptor. 219 * @ return 0 if success / return EIO if error. 220 ****************************************************************************************/ 221 error_t fatfs_read_page( struct page_s * page ); 202 222 203 223 /***************************************************************************************** … … 214 234 * automatically updates the FAT mapper from informations stored on device in case of miss. 215 235 ***************************************************************************************** 216 * @ mapper : local pointer on the FAT mapper.217 * @ first : index of the first FATFS cluster allocated to the file.218 * @ page: index of searched page in the file.219 * @ cluster : [out] pointer on buffer for the found FATFS cluster index.236 * @ mapper : local pointer on the FAT mapper. 237 * @ first_cluster : index of the first FATFS cluster allocated to the file. 238 * @ searched_page : index of searched page in the file. 239 * @ cluster : [out] pointer on buffer for the found FATFS cluster index. 220 240 * @ return 0 if success / return EIO if FAT mapper miss cannot be solved. 221 241 ****************************************************************************************/ … … 223 243 uint32_t first_cluster, 224 244 uint32_t searched_page, 225 uint32_t * cluster ); 226 227 228 229 230 ////////////////////////////////////////////////////////////////////////////////////////// 231 // These functions are called by the VFS, and must be implemented by all File Systems. 232 ////////////////////////////////////////////////////////////////////////////////////////// 233 234 /****************************************************************************************** 235 * This function initializes the FATFS file system as the root FS. 236 * It is executed cooperatively during kernel init by all CP0s in all clusters. 237 * The initilisation is made in three phases, separated by synchronisation barrier: 238 * - phase 1 : all CP0s in all clusters allocate memory for the local copy of 239 * the FATFS context. 240 * - phase 2 : cluster_0 only creates the root inode descriptor, access the external 241 * device to get information stored on the boot record, and initialises both 242 * the VFS context, and the FATFS context. 243 * - phase 3 : all other clusters initialize their local VFS context and FATFS context 244 * from values contained in cluster_0, using hal_remote_memcpy(). 245 ****************************************************************************************** 246 * @ return an extended pointer on the created root inode / return XPTR_NULL if failure. 247 *****************************************************************************************/ 248 xptr_t fatfs_init(); 249 250 /****************************************************************************************** 251 * This function mount the FATFS on the root FS. 252 * TODO not implemented [AG] 253 ****************************************************************************************** 254 * @ parent_inode_xp : extended pointer on the parent inode. 255 *****************************************************************************************/ 256 error_t fatfs_mount( xptr_t parent_inode_xp ); 257 258 259 /***************************************************************************************** 260 * This function initializes both the VFS context and the FATFS context. 261 * Both the VFS context and the FATFS context must have been previously allocated. 262 * It access the device to read the boot record, and is supposed to be called only 263 * in cluster_0 (in other clusters these contexts are replicated from values 264 * contained in cluster_0). 265 ***************************************************************************************** 266 * @ vfs_ctx : local pointer on VFS context for FATFS. 267 * @ fatfs_ctx : local pointer on specific FATFS context. 268 * @ root_inode_xp : extended pointer on VFS root inode. 269 ****************************************************************************************/ 270 error_t fatfs_ctx_init( struct vfs_ctx_s * vfs_ctx, 271 struct fatfs_ctx_s * fatfs_ctx, 272 xptr_t root_inode_xp ); 273 274 /***************************************************************************************** 275 * This function releases memory dynamically allocated for the FATFS context extension. 276 ***************************************************************************************** 277 * @ vfs_ctx : local pointer on VFS context. 278 ****************************************************************************************/ 279 void fatfs_ctx_destroy( struct vfs_ctx_s * vfs_ctx ); 280 281 282 283 /***************************************************************************************** 284 * This function allocates memory for a FATFS inode, initializes it, 285 * and link it to the VFS inode. 286 ***************************************************************************************** 287 * @ inode : local pointer on the VFS inode. 288 * @ first_cluster : first cluster index in the FAT32. 289 * @ return 0 if success / return ENOMEM if error. 290 ****************************************************************************************/ 291 error_t fatfs_inode_create( struct vfs_inode_s * inode, 292 uint32_t first_cluster); 293 294 /***************************************************************************************** 295 * This function releases memory allocated for a FATFS inode. 296 ***************************************************************************************** 297 * @ inode : local pointer on vfs_inode. 298 ****************************************************************************************/ 299 void fatfs_inode_destroy( struct vfs_inode_s * inode ); 300 301 302 303 /***************************************************************************************** 304 * This function moves a page from the mapper to the FATFS file system on device. 305 * It must be called by a thread running in cluster containing the mapper. 306 * The pointer on the mapper and the page index in file are registered 307 * in the page descriptor. 308 ***************************************************************************************** 309 * @ page : local pointer on page descriptor. 310 * @ return 0 if success / return EIO if error. 311 ****************************************************************************************/ 312 error_t fatfs_write_page( struct page_s * page ); 313 314 /***************************************************************************************** 315 * This function moves a page from the FATFS file system on device to the mapper. 316 * It must be called by a thread running in cluster containing the mapper. 317 * The pointer on the mapper and the page index in file are registered 318 * in the page descriptor. 319 ***************************************************************************************** 320 * @ page : local pointer on page descriptor. 321 * @ return 0 if success / return EIO if error. 322 ****************************************************************************************/ 323 error_t fatfs_read_page( struct page_s * page ); 324 325 326 245 uint32_t * cluster ); 327 246 328 247 #endif /* _FATFS_H_ */
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