1 /* 2 * Copyright 2004-2009, Haiku Inc. All Rights Reserved. 3 * Distributed under the terms of the MIT License. 4 */ 5 #ifndef _FS_INTERFACE_H 6 #define _FS_INTERFACE_H 7 8 /*! File System Interface Layer Definition */ 9 10 11 #include <OS.h> 12 #include <Select.h> 13 #include <module.h> 14 #include <disk_device_manager.h> 15 16 #include <sys/uio.h> 17 18 19 struct dirent; 20 struct stat; 21 struct fs_info; 22 struct select_sync; 23 24 typedef struct IORequest io_request; 25 26 27 /* additional flags passed to write_stat() (see NodeMonitor.h for the others) */ 28 // NOTE: Changing the constants here or in NodeMonitor.h will break 29 // src/kits/storage/LibBeAdapter.cpp:_kern_write_stat(). 30 #define B_STAT_SIZE_INSECURE 0x2000 31 // TODO: this should be faded out once BFS supports sparse files 32 33 /* passed to write_fs_info() */ 34 #define FS_WRITE_FSINFO_NAME 0x0001 35 36 struct file_io_vec { 37 off_t offset; 38 off_t length; 39 }; 40 41 #define B_CURRENT_FS_API_VERSION "/v1" 42 43 // flags for publish_vnode() and fs_volume_ops::get_vnode() 44 #define B_VNODE_PUBLISH_REMOVED 0x01 45 #define B_VNODE_DONT_CREATE_SPECIAL_SUB_NODE 0x02 46 47 48 #ifdef __cplusplus 49 extern "C" { 50 #endif 51 52 typedef struct fs_volume fs_volume; 53 typedef struct fs_volume_ops fs_volume_ops; 54 typedef struct fs_vnode fs_vnode; 55 typedef struct fs_vnode_ops fs_vnode_ops; 56 typedef struct file_system_module_info file_system_module_info; 57 58 struct fs_volume { 59 dev_t id; 60 partition_id partition; 61 int32 layer; 62 void* private_volume; 63 fs_volume_ops* ops; 64 fs_volume* sub_volume; 65 fs_volume* super_volume; 66 file_system_module_info* file_system; 67 char* file_system_name; 68 }; 69 70 struct fs_vnode { 71 void* private_node; 72 fs_vnode_ops* ops; 73 }; 74 75 struct fs_volume_ops { 76 status_t (*unmount)(fs_volume* volume); 77 78 status_t (*read_fs_info)(fs_volume* volume, struct fs_info* info); 79 status_t (*write_fs_info)(fs_volume* volume, const struct fs_info* info, 80 uint32 mask); 81 status_t (*sync)(fs_volume* volume); 82 83 status_t (*get_vnode)(fs_volume* volume, ino_t id, fs_vnode* vnode, 84 int* _type, uint32* _flags, bool reenter); 85 86 /* index directory & index operations */ 87 status_t (*open_index_dir)(fs_volume* volume, void** _cookie); 88 status_t (*close_index_dir)(fs_volume* volume, void* cookie); 89 status_t (*free_index_dir_cookie)(fs_volume* volume, void* cookie); 90 status_t (*read_index_dir)(fs_volume* volume, void* cookie, 91 struct dirent* buffer, size_t bufferSize, uint32* _num); 92 status_t (*rewind_index_dir)(fs_volume* volume, void* cookie); 93 94 status_t (*create_index)(fs_volume* volume, const char* name, uint32 type, 95 uint32 flags); 96 status_t (*remove_index)(fs_volume* volume, const char* name); 97 status_t (*read_index_stat)(fs_volume* volume, const char* name, 98 struct stat* stat); 99 100 /* query operations */ 101 status_t (*open_query)(fs_volume* volume, const char* query, uint32 flags, 102 port_id port, uint32 token, void** _cookie); 103 status_t (*close_query)(fs_volume* volume, void* cookie); 104 status_t (*free_query_cookie)(fs_volume* volume, void* cookie); 105 status_t (*read_query)(fs_volume* volume, void* cookie, 106 struct dirent* buffer, size_t bufferSize, uint32* _num); 107 status_t (*rewind_query)(fs_volume* volume, void* cookie); 108 109 /* support for FS layers */ 110 status_t (*all_layers_mounted)(fs_volume* volume); 111 status_t (*create_sub_vnode)(fs_volume* volume, ino_t id, fs_vnode* vnode); 112 status_t (*delete_sub_vnode)(fs_volume* volume, fs_vnode* vnode); 113 }; 114 115 struct fs_vnode_ops { 116 /* vnode operations */ 117 status_t (*lookup)(fs_volume* volume, fs_vnode* dir, const char* name, 118 ino_t* _id); 119 status_t (*get_vnode_name)(fs_volume* volume, fs_vnode* vnode, char* buffer, 120 size_t bufferSize); 121 122 status_t (*put_vnode)(fs_volume* volume, fs_vnode* vnode, bool reenter); 123 status_t (*remove_vnode)(fs_volume* volume, fs_vnode* vnode, bool reenter); 124 125 /* VM file access */ 126 bool (*can_page)(fs_volume* volume, fs_vnode* vnode, void* cookie); 127 status_t (*read_pages)(fs_volume* volume, fs_vnode* vnode, void* cookie, 128 off_t pos, const iovec* vecs, size_t count, size_t* _numBytes); 129 status_t (*write_pages)(fs_volume* volume, fs_vnode* vnode, 130 void* cookie, off_t pos, const iovec* vecs, size_t count, 131 size_t* _numBytes); 132 133 /* asynchronous I/O */ 134 status_t (*io)(fs_volume* volume, fs_vnode* vnode, void* cookie, 135 io_request* request); 136 status_t (*cancel_io)(fs_volume* volume, fs_vnode* vnode, void* cookie, 137 io_request* request); 138 139 /* cache file access */ 140 status_t (*get_file_map)(fs_volume* volume, fs_vnode* vnode, off_t offset, 141 size_t size, struct file_io_vec* vecs, size_t* _count); 142 143 /* common operations */ 144 status_t (*ioctl)(fs_volume* volume, fs_vnode* vnode, void* cookie, 145 ulong op, void* buffer, size_t length); 146 status_t (*set_flags)(fs_volume* volume, fs_vnode* vnode, void* cookie, 147 int flags); 148 status_t (*select)(fs_volume* volume, fs_vnode* vnode, void* cookie, 149 uint8 event, selectsync* sync); 150 status_t (*deselect)(fs_volume* volume, fs_vnode* vnode, void* cookie, 151 uint8 event, selectsync* sync); 152 status_t (*fsync)(fs_volume* volume, fs_vnode* vnode); 153 154 status_t (*read_symlink)(fs_volume* volume, fs_vnode* link, char* buffer, 155 size_t* _bufferSize); 156 status_t (*create_symlink)(fs_volume* volume, fs_vnode* dir, 157 const char* name, const char* path, int mode); 158 159 status_t (*link)(fs_volume* volume, fs_vnode* dir, const char* name, 160 fs_vnode* vnode); 161 status_t (*unlink)(fs_volume* volume, fs_vnode* dir, const char* name); 162 status_t (*rename)(fs_volume* volume, fs_vnode* fromDir, 163 const char* fromName, fs_vnode* toDir, const char* toName); 164 165 status_t (*access)(fs_volume* volume, fs_vnode* vnode, int mode); 166 status_t (*read_stat)(fs_volume* volume, fs_vnode* vnode, 167 struct stat* stat); 168 status_t (*write_stat)(fs_volume* volume, fs_vnode* vnode, 169 const struct stat* stat, uint32 statMask); 170 171 /* file operations */ 172 status_t (*create)(fs_volume* volume, fs_vnode* dir, const char* name, 173 int openMode, int perms, void** _cookie, 174 ino_t* _newVnodeID); 175 status_t (*open)(fs_volume* volume, fs_vnode* vnode, int openMode, 176 void** _cookie); 177 status_t (*close)(fs_volume* volume, fs_vnode* vnode, void* cookie); 178 status_t (*free_cookie)(fs_volume* volume, fs_vnode* vnode, 179 void* cookie); 180 status_t (*read)(fs_volume* volume, fs_vnode* vnode, void* cookie, 181 off_t pos, void* buffer, size_t* length); 182 status_t (*write)(fs_volume* volume, fs_vnode* vnode, void* cookie, 183 off_t pos, const void* buffer, size_t* length); 184 185 /* directory operations */ 186 status_t (*create_dir)(fs_volume* volume, fs_vnode* parent, 187 const char* name, int perms); 188 status_t (*remove_dir)(fs_volume* volume, fs_vnode* parent, 189 const char* name); 190 status_t (*open_dir)(fs_volume* volume, fs_vnode* vnode, 191 void** _cookie); 192 status_t (*close_dir)(fs_volume* volume, fs_vnode* vnode, void* cookie); 193 status_t (*free_dir_cookie)(fs_volume* volume, fs_vnode* vnode, 194 void* cookie); 195 status_t (*read_dir)(fs_volume* volume, fs_vnode* vnode, void* cookie, 196 struct dirent* buffer, size_t bufferSize, uint32* _num); 197 status_t (*rewind_dir)(fs_volume* volume, fs_vnode* vnode, 198 void* cookie); 199 200 /* attribute directory operations */ 201 status_t (*open_attr_dir)(fs_volume* volume, fs_vnode* vnode, 202 void** _cookie); 203 status_t (*close_attr_dir)(fs_volume* volume, fs_vnode* vnode, 204 void* cookie); 205 status_t (*free_attr_dir_cookie)(fs_volume* volume, fs_vnode* vnode, 206 void* cookie); 207 status_t (*read_attr_dir)(fs_volume* volume, fs_vnode* vnode, 208 void* cookie, struct dirent* buffer, size_t bufferSize, 209 uint32* _num); 210 status_t (*rewind_attr_dir)(fs_volume* volume, fs_vnode* vnode, 211 void* cookie); 212 213 /* attribute operations */ 214 status_t (*create_attr)(fs_volume* volume, fs_vnode* vnode, 215 const char* name, uint32 type, int openMode, 216 void** _cookie); 217 status_t (*open_attr)(fs_volume* volume, fs_vnode* vnode, const char* name, 218 int openMode, void** _cookie); 219 status_t (*close_attr)(fs_volume* volume, fs_vnode* vnode, 220 void* cookie); 221 status_t (*free_attr_cookie)(fs_volume* volume, fs_vnode* vnode, 222 void* cookie); 223 status_t (*read_attr)(fs_volume* volume, fs_vnode* vnode, void* cookie, 224 off_t pos, void* buffer, size_t* length); 225 status_t (*write_attr)(fs_volume* volume, fs_vnode* vnode, void* cookie, 226 off_t pos, const void* buffer, size_t* length); 227 228 status_t (*read_attr_stat)(fs_volume* volume, fs_vnode* vnode, 229 void* cookie, struct stat* stat); 230 status_t (*write_attr_stat)(fs_volume* volume, fs_vnode* vnode, 231 void* cookie, const struct stat* stat, int statMask); 232 status_t (*rename_attr)(fs_volume* volume, fs_vnode* fromVnode, 233 const char* fromName, fs_vnode* toVnode, const char* toName); 234 status_t (*remove_attr)(fs_volume* volume, fs_vnode* vnode, 235 const char* name); 236 237 /* support for node and FS layers */ 238 status_t (*create_special_node)(fs_volume* volume, fs_vnode* dir, 239 const char* name, fs_vnode* subVnode, mode_t mode, uint32 flags, 240 fs_vnode* _superVnode, ino_t* _nodeID); 241 status_t (*get_super_vnode)(fs_volume* volume, fs_vnode* vnode, 242 fs_volume* superVolume, fs_vnode* superVnode); 243 }; 244 245 struct file_system_module_info { 246 struct module_info info; 247 const char* short_name; 248 const char* pretty_name; 249 uint32 flags; // DDM flags 250 251 /* scanning (the device is write locked) */ 252 float (*identify_partition)(int fd, partition_data* partition, 253 void** _cookie); 254 status_t (*scan_partition)(int fd, partition_data* partition, 255 void* cookie); 256 void (*free_identify_partition_cookie)(partition_data* partition, 257 void* cookie); 258 void (*free_partition_content_cookie)(partition_data* partition); 259 260 /* general operations */ 261 status_t (*mount)(fs_volume* volume, const char* device, uint32 flags, 262 const char* args, ino_t* _rootVnodeID); 263 264 /* capability querying (the device is read locked) */ 265 uint32 (*get_supported_operations)(partition_data* partition, uint32 mask); 266 267 bool (*validate_resize)(partition_data* partition, off_t* size); 268 bool (*validate_move)(partition_data* partition, off_t* start); 269 bool (*validate_set_content_name)(partition_data* partition, 270 char* name); 271 bool (*validate_set_content_parameters)(partition_data* partition, 272 const char* parameters); 273 bool (*validate_initialize)(partition_data* partition, char* name, 274 const char* parameters); 275 276 /* shadow partition modification (device is write locked) */ 277 status_t (*shadow_changed)(partition_data* partition, 278 partition_data* child, uint32 operation); 279 280 /* writing (the device is NOT locked) */ 281 status_t (*defragment)(int fd, partition_id partition, 282 disk_job_id job); 283 status_t (*repair)(int fd, partition_id partition, bool checkOnly, 284 disk_job_id job); 285 status_t (*resize)(int fd, partition_id partition, off_t size, 286 disk_job_id job); 287 status_t (*move)(int fd, partition_id partition, off_t offset, 288 disk_job_id job); 289 status_t (*set_content_name)(int fd, partition_id partition, 290 const char* name, disk_job_id job); 291 status_t (*set_content_parameters)(int fd, partition_id partition, 292 const char* parameters, disk_job_id job); 293 status_t (*initialize)(int fd, partition_id partition, const char* name, 294 const char* parameters, off_t partitionSize, disk_job_id job); 295 }; 296 297 298 /* file system add-ons only prototypes */ 299 300 // callbacks for do_iterative_fd_io() 301 typedef status_t (*iterative_io_get_vecs)(void* cookie, io_request* request, 302 off_t offset, size_t size, struct file_io_vec* vecs, 303 size_t* _count); 304 typedef status_t (*iterative_io_finished)(void* cookie, io_request* request, 305 status_t status, bool partialTransfer, size_t bytesTransferred); 306 307 extern status_t new_vnode(fs_volume* volume, ino_t vnodeID, void* privateNode, 308 fs_vnode_ops* ops); 309 extern status_t publish_vnode(fs_volume* volume, ino_t vnodeID, 310 void* privateNode, fs_vnode_ops* ops, int type, 311 uint32 flags); 312 extern status_t get_vnode(fs_volume* volume, ino_t vnodeID, 313 void** _privateNode); 314 extern status_t put_vnode(fs_volume* volume, ino_t vnodeID); 315 extern status_t acquire_vnode(fs_volume* volume, ino_t vnodeID); 316 extern status_t remove_vnode(fs_volume* volume, ino_t vnodeID); 317 extern status_t unremove_vnode(fs_volume* volume, ino_t vnodeID); 318 extern status_t get_vnode_removed(fs_volume* volume, ino_t vnodeID, 319 bool* _removed); 320 extern fs_volume* volume_for_vnode(fs_vnode* vnode); 321 322 extern status_t read_pages(int fd, off_t pos, const struct iovec* vecs, 323 size_t count, size_t* _numBytes); 324 extern status_t write_pages(int fd, off_t pos, const struct iovec* vecs, 325 size_t count, size_t* _numBytes); 326 extern status_t read_file_io_vec_pages(int fd, 327 const struct file_io_vec* fileVecs, size_t fileVecCount, 328 const struct iovec* vecs, size_t vecCount, 329 uint32* _vecIndex, size_t* _vecOffset, size_t* _bytes); 330 extern status_t write_file_io_vec_pages(int fd, 331 const struct file_io_vec* fileVecs, size_t fileVecCount, 332 const struct iovec* vecs, size_t vecCount, 333 uint32* _vecIndex, size_t* _vecOffset, size_t* _bytes); 334 extern status_t do_fd_io(int fd, io_request* request); 335 extern status_t do_iterative_fd_io(int fd, io_request* request, 336 iterative_io_get_vecs getVecs, 337 iterative_io_finished finished, void* cookie); 338 339 extern status_t notify_entry_created(dev_t device, ino_t directory, 340 const char* name, ino_t node); 341 extern status_t notify_entry_removed(dev_t device, ino_t directory, 342 const char* name, ino_t node); 343 extern status_t notify_entry_moved(dev_t device, ino_t fromDirectory, 344 const char* fromName, ino_t toDirectory, 345 const char* toName, ino_t node); 346 extern status_t notify_stat_changed(dev_t device, ino_t node, 347 uint32 statFields); 348 extern status_t notify_attribute_changed(dev_t device, ino_t node, 349 const char* attribute, int32 cause); 350 351 extern status_t notify_query_entry_created(port_id port, int32 token, 352 dev_t device, ino_t directory, const char* name, 353 ino_t node); 354 extern status_t notify_query_entry_removed(port_id port, int32 token, 355 dev_t device, ino_t directory, const char* name, 356 ino_t node); 357 358 #ifdef __cplusplus 359 } 360 #endif 361 362 #endif /* _FS_INTERFACE_H */ 363