Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 1 | /* |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 2 | * nt_io.c --- This is the Nt I/O interface to the I/O manager. |
| 3 | * |
| 4 | * Implements a one-block write-through cache. |
| 5 | * |
| 6 | * Copyright (C) 1993, 1994, 1995 Theodore Ts'o. |
Theodore Ts'o | 00ab043 | 1999-10-26 02:39:02 +0000 | [diff] [blame] | 7 | * Copyright (C) 1998 Andrey Shedel (andreys@ns.cr.cyco.com) |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 8 | * |
| 9 | * %Begin-Header% |
| 10 | * This file may be redistributed under the terms of the GNU Public |
| 11 | * License. |
| 12 | * %End-Header% |
| 13 | */ |
| 14 | |
| 15 | #ifdef HAVE_CONFIG_H |
| 16 | #include "config.h" |
| 17 | #endif |
| 18 | |
| 19 | |
| 20 | // |
| 21 | // I need some warnings to disable... |
| 22 | // |
| 23 | |
| 24 | |
| 25 | #pragma warning(disable:4514) // unreferenced inline function has been removed |
| 26 | #pragma warning(push,4) |
| 27 | |
| 28 | #pragma warning(disable:4201) // nonstandard extension used : nameless struct/union) |
| 29 | #pragma warning(disable:4214) // nonstandard extension used : bit field types other than int |
| 30 | #pragma warning(disable:4115) // named type definition in parentheses |
| 31 | |
| 32 | #include <ntddk.h> |
| 33 | #include <ntdddisk.h> |
| 34 | #include <ntstatus.h> |
| 35 | |
| 36 | #pragma warning(pop) |
| 37 | |
| 38 | |
| 39 | // |
| 40 | // Some native APIs. |
| 41 | // |
| 42 | |
| 43 | NTSYSAPI |
| 44 | ULONG |
| 45 | NTAPI |
| 46 | RtlNtStatusToDosError( |
| 47 | IN NTSTATUS Status |
| 48 | ); |
| 49 | |
| 50 | NTSYSAPI |
| 51 | NTSTATUS |
| 52 | NTAPI |
| 53 | NtClose( |
| 54 | IN HANDLE Handle |
| 55 | ); |
| 56 | |
| 57 | |
| 58 | NTSYSAPI |
| 59 | NTSTATUS |
| 60 | NTAPI |
| 61 | NtOpenFile( |
| 62 | OUT PHANDLE FileHandle, |
| 63 | IN ACCESS_MASK DesiredAccess, |
| 64 | IN POBJECT_ATTRIBUTES ObjectAttributes, |
| 65 | OUT PIO_STATUS_BLOCK IoStatusBlock, |
| 66 | IN ULONG ShareAccess, |
| 67 | IN ULONG OpenOptions |
| 68 | ); |
| 69 | |
| 70 | NTSYSAPI |
| 71 | NTSTATUS |
| 72 | NTAPI |
| 73 | NtFlushBuffersFile( |
| 74 | IN HANDLE FileHandle, |
| 75 | OUT PIO_STATUS_BLOCK IoStatusBlock |
| 76 | ); |
| 77 | |
| 78 | |
| 79 | NTSYSAPI |
| 80 | NTSTATUS |
| 81 | NTAPI |
| 82 | NtReadFile( |
| 83 | IN HANDLE FileHandle, |
| 84 | IN HANDLE Event OPTIONAL, |
| 85 | IN PIO_APC_ROUTINE ApcRoutine OPTIONAL, |
| 86 | IN PVOID ApcContext OPTIONAL, |
| 87 | OUT PIO_STATUS_BLOCK IoStatusBlock, |
| 88 | OUT PVOID Buffer, |
| 89 | IN ULONG Length, |
| 90 | IN PLARGE_INTEGER ByteOffset OPTIONAL, |
| 91 | IN PULONG Key OPTIONAL |
| 92 | ); |
| 93 | |
| 94 | NTSYSAPI |
| 95 | NTSTATUS |
| 96 | NTAPI |
| 97 | NtWriteFile( |
| 98 | IN HANDLE FileHandle, |
| 99 | IN HANDLE Event OPTIONAL, |
| 100 | IN PIO_APC_ROUTINE ApcRoutine OPTIONAL, |
| 101 | IN PVOID ApcContext OPTIONAL, |
| 102 | OUT PIO_STATUS_BLOCK IoStatusBlock, |
| 103 | IN PVOID Buffer, |
| 104 | IN ULONG Length, |
| 105 | IN PLARGE_INTEGER ByteOffset OPTIONAL, |
| 106 | IN PULONG Key OPTIONAL |
| 107 | ); |
| 108 | |
| 109 | NTSYSAPI |
| 110 | NTSTATUS |
| 111 | NTAPI |
| 112 | NtDeviceIoControlFile( |
| 113 | IN HANDLE FileHandle, |
| 114 | IN HANDLE Event OPTIONAL, |
| 115 | IN PIO_APC_ROUTINE ApcRoutine OPTIONAL, |
| 116 | IN PVOID ApcContext OPTIONAL, |
| 117 | OUT PIO_STATUS_BLOCK IoStatusBlock, |
| 118 | IN ULONG IoControlCode, |
| 119 | IN PVOID InputBuffer OPTIONAL, |
| 120 | IN ULONG InputBufferLength, |
| 121 | OUT PVOID OutputBuffer OPTIONAL, |
| 122 | IN ULONG OutputBufferLength |
| 123 | ); |
| 124 | |
| 125 | NTSYSAPI |
| 126 | NTSTATUS |
| 127 | NTAPI |
| 128 | NtFsControlFile( |
| 129 | IN HANDLE FileHandle, |
| 130 | IN HANDLE Event OPTIONAL, |
| 131 | IN PIO_APC_ROUTINE ApcRoutine OPTIONAL, |
| 132 | IN PVOID ApcContext OPTIONAL, |
| 133 | OUT PIO_STATUS_BLOCK IoStatusBlock, |
| 134 | IN ULONG IoControlCode, |
| 135 | IN PVOID InputBuffer OPTIONAL, |
| 136 | IN ULONG InputBufferLength, |
| 137 | OUT PVOID OutputBuffer OPTIONAL, |
| 138 | IN ULONG OutputBufferLength |
| 139 | ); |
| 140 | |
| 141 | |
| 142 | NTSYSAPI |
| 143 | NTSTATUS |
| 144 | NTAPI |
| 145 | NtDelayExecution( |
| 146 | IN BOOLEAN Alertable, |
| 147 | IN PLARGE_INTEGER Interval |
| 148 | ); |
| 149 | |
| 150 | |
| 151 | #define FSCTL_LOCK_VOLUME CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 6, METHOD_BUFFERED, FILE_ANY_ACCESS) |
| 152 | #define FSCTL_UNLOCK_VOLUME CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 7, METHOD_BUFFERED, FILE_ANY_ACCESS) |
| 153 | #define FSCTL_DISMOUNT_VOLUME CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 8, METHOD_BUFFERED, FILE_ANY_ACCESS) |
| 154 | #define FSCTL_IS_VOLUME_MOUNTED CTL_CODE(FILE_DEVICE_FILE_SYSTEM,10, METHOD_BUFFERED, FILE_ANY_ACCESS) |
| 155 | |
| 156 | |
| 157 | // |
| 158 | // useful macros |
| 159 | // |
| 160 | |
| 161 | #define BooleanFlagOn(Flags,SingleFlag) ((BOOLEAN)((((Flags) & (SingleFlag)) != 0))) |
| 162 | |
| 163 | |
| 164 | // |
| 165 | // Include Win32 error codes. |
| 166 | // |
| 167 | |
| 168 | #include <winerror.h> |
| 169 | |
| 170 | // |
| 171 | // standard stuff |
| 172 | // |
| 173 | |
| 174 | #include <assert.h> |
| 175 | #include <stdio.h> |
| 176 | #include <string.h> |
| 177 | #include <stdlib.h> |
| 178 | #include <malloc.h> |
| 179 | |
| 180 | #include <linux/types.h> |
| 181 | #include <linux/ext2_fs.h> |
| 182 | #include <errno.h> |
| 183 | |
| 184 | #include "et/com_err.h" |
| 185 | #include "ext2fs/ext2fs.h" |
| 186 | #include "ext2fs/ext2_err.h" |
| 187 | |
| 188 | |
| 189 | |
| 190 | |
| 191 | // |
| 192 | // For checking structure magic numbers... |
| 193 | // |
| 194 | |
| 195 | |
| 196 | #define EXT2_CHECK_MAGIC(struct, code) \ |
| 197 | if ((struct)->magic != (code)) return (code) |
| 198 | |
| 199 | #define EXT2_ET_MAGIC_NT_IO_CHANNEL 0x10ed |
| 200 | |
| 201 | |
| 202 | // |
| 203 | // Private data block |
| 204 | // |
| 205 | |
| 206 | typedef struct _NT_PRIVATE_DATA { |
| 207 | int magic; |
| 208 | HANDLE Handle; |
| 209 | int Flags; |
| 210 | PCHAR Buffer; |
| 211 | __u32 BufferBlockNumber; |
| 212 | ULONG BufferSize; |
| 213 | BOOLEAN OpenedReadonly; |
| 214 | BOOLEAN Written; |
| 215 | }NT_PRIVATE_DATA, *PNT_PRIVATE_DATA; |
| 216 | |
| 217 | |
| 218 | |
| 219 | // |
| 220 | // Standard interface prototypes |
| 221 | // |
| 222 | |
| 223 | static errcode_t nt_open(const char *name, int flags, io_channel *channel); |
| 224 | static errcode_t nt_close(io_channel channel); |
| 225 | static errcode_t nt_set_blksize(io_channel channel, int blksize); |
| 226 | static errcode_t nt_read_blk(io_channel channel, unsigned long block, |
| 227 | int count, void *data); |
| 228 | static errcode_t nt_write_blk(io_channel channel, unsigned long block, |
| 229 | int count, const void *data); |
| 230 | static errcode_t nt_flush(io_channel channel); |
| 231 | |
| 232 | static struct struct_io_manager struct_nt_manager = { |
| 233 | EXT2_ET_MAGIC_IO_MANAGER, |
| 234 | "NT I/O Manager", |
| 235 | nt_open, |
| 236 | nt_close, |
| 237 | nt_set_blksize, |
| 238 | nt_read_blk, |
| 239 | nt_write_blk, |
| 240 | nt_flush |
| 241 | }; |
| 242 | |
| 243 | |
| 244 | |
| 245 | // |
| 246 | // function to get API |
| 247 | // |
| 248 | |
| 249 | io_manager nt_io_manager() |
| 250 | { |
| 251 | return &struct_nt_manager; |
| 252 | } |
| 253 | |
| 254 | |
| 255 | |
| 256 | |
| 257 | |
| 258 | // |
| 259 | // This is a code to convert Win32 errors to unix errno |
| 260 | // |
| 261 | |
| 262 | typedef struct { |
| 263 | ULONG WinError; |
| 264 | int errnocode; |
| 265 | }ERROR_ENTRY; |
| 266 | |
| 267 | static ERROR_ENTRY ErrorTable[] = { |
| 268 | { ERROR_INVALID_FUNCTION, EINVAL }, |
| 269 | { ERROR_FILE_NOT_FOUND, ENOENT }, |
| 270 | { ERROR_PATH_NOT_FOUND, ENOENT }, |
| 271 | { ERROR_TOO_MANY_OPEN_FILES, EMFILE }, |
| 272 | { ERROR_ACCESS_DENIED, EACCES }, |
| 273 | { ERROR_INVALID_HANDLE, EBADF }, |
| 274 | { ERROR_ARENA_TRASHED, ENOMEM }, |
| 275 | { ERROR_NOT_ENOUGH_MEMORY, ENOMEM }, |
| 276 | { ERROR_INVALID_BLOCK, ENOMEM }, |
| 277 | { ERROR_BAD_ENVIRONMENT, E2BIG }, |
| 278 | { ERROR_BAD_FORMAT, ENOEXEC }, |
| 279 | { ERROR_INVALID_ACCESS, EINVAL }, |
| 280 | { ERROR_INVALID_DATA, EINVAL }, |
| 281 | { ERROR_INVALID_DRIVE, ENOENT }, |
| 282 | { ERROR_CURRENT_DIRECTORY, EACCES }, |
| 283 | { ERROR_NOT_SAME_DEVICE, EXDEV }, |
| 284 | { ERROR_NO_MORE_FILES, ENOENT }, |
| 285 | { ERROR_LOCK_VIOLATION, EACCES }, |
| 286 | { ERROR_BAD_NETPATH, ENOENT }, |
| 287 | { ERROR_NETWORK_ACCESS_DENIED, EACCES }, |
| 288 | { ERROR_BAD_NET_NAME, ENOENT }, |
| 289 | { ERROR_FILE_EXISTS, EEXIST }, |
| 290 | { ERROR_CANNOT_MAKE, EACCES }, |
| 291 | { ERROR_FAIL_I24, EACCES }, |
| 292 | { ERROR_INVALID_PARAMETER, EINVAL }, |
| 293 | { ERROR_NO_PROC_SLOTS, EAGAIN }, |
| 294 | { ERROR_DRIVE_LOCKED, EACCES }, |
| 295 | { ERROR_BROKEN_PIPE, EPIPE }, |
| 296 | { ERROR_DISK_FULL, ENOSPC }, |
| 297 | { ERROR_INVALID_TARGET_HANDLE, EBADF }, |
| 298 | { ERROR_INVALID_HANDLE, EINVAL }, |
| 299 | { ERROR_WAIT_NO_CHILDREN, ECHILD }, |
| 300 | { ERROR_CHILD_NOT_COMPLETE, ECHILD }, |
| 301 | { ERROR_DIRECT_ACCESS_HANDLE, EBADF }, |
| 302 | { ERROR_NEGATIVE_SEEK, EINVAL }, |
| 303 | { ERROR_SEEK_ON_DEVICE, EACCES }, |
| 304 | { ERROR_DIR_NOT_EMPTY, ENOTEMPTY }, |
| 305 | { ERROR_NOT_LOCKED, EACCES }, |
| 306 | { ERROR_BAD_PATHNAME, ENOENT }, |
| 307 | { ERROR_MAX_THRDS_REACHED, EAGAIN }, |
| 308 | { ERROR_LOCK_FAILED, EACCES }, |
| 309 | { ERROR_ALREADY_EXISTS, EEXIST }, |
| 310 | { ERROR_FILENAME_EXCED_RANGE, ENOENT }, |
| 311 | { ERROR_NESTING_NOT_ALLOWED, EAGAIN }, |
| 312 | { ERROR_NOT_ENOUGH_QUOTA, ENOMEM } |
| 313 | }; |
| 314 | |
| 315 | |
| 316 | |
| 317 | |
| 318 | static |
| 319 | unsigned |
| 320 | _MapDosError ( |
| 321 | IN ULONG WinError |
| 322 | ) |
| 323 | { |
| 324 | int i; |
| 325 | |
| 326 | // |
| 327 | // Lookup |
| 328 | // |
| 329 | |
| 330 | for (i = 0; i < (sizeof(ErrorTable)/sizeof(ErrorTable[0])); ++i) |
| 331 | { |
| 332 | if (WinError == ErrorTable[i].WinError) |
| 333 | { |
| 334 | return ErrorTable[i].errnocode; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | // |
| 339 | // not in table. Check ranges |
| 340 | // |
| 341 | |
| 342 | if ((WinError >= ERROR_WRITE_PROTECT) && |
| 343 | (WinError <= ERROR_SHARING_BUFFER_EXCEEDED)) |
| 344 | { |
| 345 | return EACCES; |
| 346 | } |
| 347 | else if ((WinError >= ERROR_INVALID_STARTING_CODESEG) && |
| 348 | (WinError <= ERROR_INFLOOP_IN_RELOC_CHAIN)) |
| 349 | { |
| 350 | return ENOEXEC; |
| 351 | } |
| 352 | else |
| 353 | { |
| 354 | return EINVAL; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | |
| 359 | |
| 360 | |
| 361 | |
| 362 | |
| 363 | |
| 364 | // |
| 365 | // Function to map NT status to dos error. |
| 366 | // |
| 367 | |
| 368 | static |
| 369 | __inline |
| 370 | unsigned |
| 371 | _MapNtStatus( |
| 372 | IN NTSTATUS Status |
| 373 | ) |
| 374 | { |
| 375 | return _MapDosError(RtlNtStatusToDosError(Status)); |
| 376 | } |
| 377 | |
| 378 | |
| 379 | |
| 380 | |
| 381 | |
| 382 | // |
| 383 | // Helper functions to make things easyer |
| 384 | // |
| 385 | |
| 386 | static |
| 387 | NTSTATUS |
| 388 | _OpenNtName( |
| 389 | IN PCSTR Name, |
| 390 | IN BOOLEAN Readonly, |
| 391 | OUT PHANDLE Handle, |
| 392 | OUT PBOOLEAN OpenedReadonly OPTIONAL |
| 393 | ) |
| 394 | { |
| 395 | UNICODE_STRING UnicodeString; |
| 396 | ANSI_STRING AnsiString; |
| 397 | WCHAR Buffer[512]; |
| 398 | NTSTATUS Status; |
| 399 | OBJECT_ATTRIBUTES ObjectAttributes; |
| 400 | IO_STATUS_BLOCK IoStatusBlock; |
| 401 | |
| 402 | // |
| 403 | // Make Unicode name from inlut string |
| 404 | // |
| 405 | |
| 406 | UnicodeString.Buffer = &Buffer[0]; |
| 407 | UnicodeString.Length = 0; |
| 408 | UnicodeString.MaximumLength = sizeof(Buffer); // in bytes!!! |
| 409 | |
| 410 | RtlInitAnsiString(&AnsiString, Name); |
| 411 | |
| 412 | Status = RtlAnsiStringToUnicodeString(&UnicodeString, &AnsiString, FALSE); |
| 413 | |
| 414 | if(!NT_SUCCESS(Status)) |
| 415 | { |
| 416 | return Status; // Unpappable character? |
| 417 | } |
| 418 | |
| 419 | // |
| 420 | // Initialize object |
| 421 | // |
| 422 | |
| 423 | InitializeObjectAttributes(&ObjectAttributes, |
| 424 | &UnicodeString, |
| 425 | OBJ_CASE_INSENSITIVE, |
| 426 | NULL, |
| 427 | NULL ); |
| 428 | |
| 429 | // |
| 430 | // Try to open it in initial mode |
| 431 | // |
| 432 | |
| 433 | if(ARGUMENT_PRESENT(OpenedReadonly)) |
| 434 | { |
| 435 | *OpenedReadonly = Readonly; |
| 436 | } |
| 437 | |
| 438 | |
| 439 | Status = NtOpenFile(Handle, |
| 440 | SYNCHRONIZE | FILE_READ_DATA | (Readonly ? 0 : FILE_WRITE_DATA), |
| 441 | &ObjectAttributes, |
| 442 | &IoStatusBlock, |
| 443 | FILE_SHARE_WRITE | FILE_SHARE_READ, |
Theodore Ts'o | fe70fd3 | 1999-10-26 02:34:47 +0000 | [diff] [blame] | 444 | FILE_SYNCHRONOUS_IO_NONALERT); |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 445 | |
| 446 | if(!NT_SUCCESS(Status)) |
| 447 | { |
| 448 | // |
| 449 | // Maybe was just mounted? wait 0.5 sec and retry. |
| 450 | // |
| 451 | |
| 452 | LARGE_INTEGER Interval; |
| 453 | Interval.QuadPart = -5000000; // 0.5 sec. from now |
| 454 | |
| 455 | NtDelayExecution(FALSE, &Interval); |
| 456 | |
| 457 | Status = NtOpenFile(Handle, |
| 458 | SYNCHRONIZE | FILE_READ_DATA | (Readonly ? 0 : FILE_WRITE_DATA), |
| 459 | &ObjectAttributes, |
| 460 | &IoStatusBlock, |
| 461 | FILE_SHARE_WRITE | FILE_SHARE_READ, |
Theodore Ts'o | fe70fd3 | 1999-10-26 02:34:47 +0000 | [diff] [blame] | 462 | FILE_SYNCHRONOUS_IO_NONALERT); |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 463 | |
| 464 | // |
| 465 | // Try to satisfy mode |
| 466 | // |
| 467 | |
| 468 | if((STATUS_ACCESS_DENIED == Status) && !Readonly) |
| 469 | { |
| 470 | if(ARGUMENT_PRESENT(OpenedReadonly)) |
| 471 | { |
| 472 | *OpenedReadonly = TRUE; |
| 473 | } |
| 474 | |
| 475 | Status = NtOpenFile(Handle, |
| 476 | SYNCHRONIZE | FILE_READ_DATA, |
| 477 | &ObjectAttributes, |
| 478 | &IoStatusBlock, |
| 479 | FILE_SHARE_WRITE | FILE_SHARE_READ, |
Theodore Ts'o | fe70fd3 | 1999-10-26 02:34:47 +0000 | [diff] [blame] | 480 | FILE_SYNCHRONOUS_IO_NONALERT); |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 481 | } |
| 482 | } |
| 483 | |
| 484 | |
| 485 | |
| 486 | // |
| 487 | // done |
| 488 | // |
| 489 | |
| 490 | return Status; |
| 491 | } |
| 492 | |
| 493 | |
| 494 | static |
| 495 | NTSTATUS |
| 496 | _OpenDriveLetter( |
| 497 | IN CHAR Letter, |
| 498 | IN BOOLEAN ReadOnly, |
| 499 | OUT PHANDLE Handle, |
| 500 | OUT PBOOLEAN OpenedReadonly OPTIONAL |
| 501 | ) |
| 502 | { |
| 503 | CHAR Buffer[100]; |
| 504 | |
| 505 | sprintf(Buffer, "\\DosDevices\\%c:", Letter); |
| 506 | |
| 507 | return _OpenNtName(Buffer, ReadOnly, Handle, OpenedReadonly); |
| 508 | } |
| 509 | |
| 510 | |
| 511 | // |
| 512 | // Flush device |
| 513 | // |
| 514 | |
| 515 | static |
| 516 | __inline |
| 517 | NTSTATUS |
| 518 | _FlushDrive( |
| 519 | IN HANDLE Handle |
| 520 | ) |
| 521 | { |
| 522 | IO_STATUS_BLOCK IoStatusBlock; |
| 523 | return NtFlushBuffersFile(Handle, &IoStatusBlock); |
| 524 | } |
| 525 | |
| 526 | |
| 527 | // |
| 528 | // lock drive |
| 529 | // |
| 530 | |
| 531 | static |
| 532 | __inline |
| 533 | NTSTATUS |
| 534 | _LockDrive( |
| 535 | IN HANDLE Handle |
| 536 | ) |
| 537 | { |
| 538 | IO_STATUS_BLOCK IoStatusBlock; |
| 539 | return NtFsControlFile(Handle, 0, 0, 0, &IoStatusBlock, FSCTL_LOCK_VOLUME, 0, 0, 0, 0); |
| 540 | } |
| 541 | |
| 542 | |
| 543 | // |
| 544 | // unlock drive |
| 545 | // |
| 546 | |
| 547 | static |
| 548 | __inline |
| 549 | NTSTATUS |
| 550 | _UnlockDrive( |
| 551 | IN HANDLE Handle |
| 552 | ) |
| 553 | { |
| 554 | IO_STATUS_BLOCK IoStatusBlock; |
| 555 | return NtFsControlFile(Handle, 0, 0, 0, &IoStatusBlock, FSCTL_UNLOCK_VOLUME, 0, 0, 0, 0); |
| 556 | } |
| 557 | |
| 558 | static |
| 559 | __inline |
| 560 | NTSTATUS |
| 561 | _DismountDrive( |
| 562 | IN HANDLE Handle |
| 563 | ) |
| 564 | { |
| 565 | IO_STATUS_BLOCK IoStatusBlock; |
| 566 | return NtFsControlFile(Handle, 0, 0, 0, &IoStatusBlock, FSCTL_DISMOUNT_VOLUME, 0, 0, 0, 0); |
| 567 | } |
| 568 | |
| 569 | |
| 570 | // |
| 571 | // is mounted |
| 572 | // |
| 573 | |
| 574 | static |
| 575 | __inline |
| 576 | BOOLEAN |
| 577 | _IsMounted( |
| 578 | IN HANDLE Handle |
| 579 | ) |
| 580 | { |
| 581 | IO_STATUS_BLOCK IoStatusBlock; |
| 582 | NTSTATUS Status; |
| 583 | Status = NtFsControlFile(Handle, 0, 0, 0, &IoStatusBlock, FSCTL_IS_VOLUME_MOUNTED, 0, 0, 0, 0); |
| 584 | return (BOOLEAN)(STATUS_SUCCESS == Status); |
| 585 | } |
| 586 | |
| 587 | |
| 588 | static |
| 589 | __inline |
| 590 | NTSTATUS |
| 591 | _CloseDisk( |
| 592 | IN HANDLE Handle |
| 593 | ) |
| 594 | { |
| 595 | return NtClose(Handle); |
| 596 | } |
| 597 | |
| 598 | |
| 599 | |
| 600 | |
| 601 | // |
| 602 | // Make NT name from any recognized name |
| 603 | // |
| 604 | |
| 605 | static |
| 606 | PCSTR |
| 607 | _NormalizeDeviceName( |
| 608 | IN PCSTR Device, |
| 609 | IN PSTR NormalizedDeviceNameBuffer |
| 610 | ) |
| 611 | { |
| 612 | int PartitionNumber = -1; |
| 613 | UCHAR DiskNumber; |
| 614 | PSTR p; |
| 615 | |
| 616 | |
| 617 | // |
| 618 | // Do not try to parse NT name |
| 619 | // |
| 620 | |
| 621 | if('\\' == *Device) |
| 622 | return Device; |
| 623 | |
| 624 | |
| 625 | |
| 626 | // |
| 627 | // Strip leading '/dev/' if any |
| 628 | // |
| 629 | |
| 630 | if(('/' == *(Device)) && |
| 631 | ('d' == *(Device + 1)) && |
| 632 | ('e' == *(Device + 2)) && |
| 633 | ('v' == *(Device + 3)) && |
| 634 | ('/' == *(Device + 4))) |
| 635 | { |
| 636 | Device += 5; |
| 637 | } |
| 638 | |
| 639 | if('\0' == *Device) |
| 640 | { |
| 641 | return NULL; |
| 642 | } |
| 643 | |
| 644 | |
| 645 | // |
| 646 | // forms: hda[n], fd[n] |
| 647 | // |
| 648 | |
| 649 | if('d' != *(Device + 1)) |
| 650 | { |
| 651 | return NULL; |
| 652 | } |
| 653 | |
| 654 | if('h' == *Device) |
| 655 | { |
| 656 | if((*(Device + 2) < 'a') || (*(Device + 2) > ('a' + 9)) || |
| 657 | ((*(Device + 3) != '\0') && |
| 658 | ((*(Device + 4) != '\0') || |
| 659 | ((*(Device + 3) < '0') || (*(Device + 3) > '9')) |
| 660 | ) |
| 661 | ) |
| 662 | ) |
| 663 | { |
| 664 | return NULL; |
| 665 | } |
| 666 | |
| 667 | DiskNumber = (UCHAR)(*(Device + 2) - 'a'); |
| 668 | |
| 669 | if(*(Device + 3) != '\0') |
| 670 | { |
| 671 | PartitionNumber = (*(Device + 3) - '0'); |
| 672 | } |
| 673 | |
| 674 | } |
| 675 | else if('f' == *Device) |
| 676 | { |
| 677 | // |
| 678 | // 3-d letted should be a digit. |
| 679 | // |
| 680 | |
| 681 | if((*(Device + 3) != '\0') || |
| 682 | (*(Device + 2) < '0') || (*(Device + 2) > '9')) |
| 683 | { |
| 684 | return NULL; |
| 685 | } |
| 686 | |
| 687 | DiskNumber = (UCHAR)(*(Device + 2) - '0'); |
| 688 | |
| 689 | } |
| 690 | else |
| 691 | { |
| 692 | // |
| 693 | // invalid prefix |
| 694 | // |
| 695 | |
| 696 | return NULL; |
| 697 | } |
| 698 | |
| 699 | |
| 700 | |
| 701 | // |
| 702 | // Prefix |
| 703 | // |
| 704 | |
| 705 | strcpy(NormalizedDeviceNameBuffer, "\\Device\\"); |
| 706 | |
| 707 | // |
| 708 | // Media name |
| 709 | // |
| 710 | |
| 711 | switch(*Device) |
| 712 | { |
| 713 | |
| 714 | case 'f': |
| 715 | strcat(NormalizedDeviceNameBuffer, "Floppy0"); |
| 716 | break; |
| 717 | |
| 718 | case 'h': |
| 719 | strcat(NormalizedDeviceNameBuffer, "Harddisk0"); |
| 720 | break; |
| 721 | } |
| 722 | |
| 723 | |
| 724 | p = NormalizedDeviceNameBuffer + strlen(NormalizedDeviceNameBuffer) - 1; |
| 725 | *p = (CHAR)(*p + DiskNumber); |
| 726 | |
| 727 | |
| 728 | // |
| 729 | // Partition nr. |
| 730 | // |
| 731 | |
| 732 | if(PartitionNumber >= 0) |
| 733 | { |
| 734 | strcat(NormalizedDeviceNameBuffer, "\\Partition0"); |
| 735 | |
| 736 | p = NormalizedDeviceNameBuffer + strlen(NormalizedDeviceNameBuffer) - 1; |
| 737 | *p = (CHAR)(*p + PartitionNumber); |
| 738 | } |
| 739 | |
| 740 | |
| 741 | return NormalizedDeviceNameBuffer; |
| 742 | } |
| 743 | |
| 744 | |
| 745 | |
| 746 | |
| 747 | static |
| 748 | VOID |
| 749 | _GetDeviceSize( |
| 750 | IN HANDLE h, |
| 751 | OUT unsigned __int64 *FsSize |
| 752 | ) |
| 753 | { |
| 754 | PARTITION_INFORMATION pi; |
| 755 | DISK_GEOMETRY gi; |
| 756 | NTSTATUS Status; |
| 757 | IO_STATUS_BLOCK IoStatusBlock; |
| 758 | |
| 759 | // |
| 760 | // Zero it |
| 761 | // |
| 762 | |
| 763 | *FsSize = 0; |
| 764 | |
| 765 | // |
| 766 | // Call driver |
| 767 | // |
| 768 | |
| 769 | RtlZeroMemory(&pi, sizeof(PARTITION_INFORMATION)); |
| 770 | |
| 771 | Status = NtDeviceIoControlFile( |
| 772 | h, NULL, NULL, NULL, &IoStatusBlock, IOCTL_DISK_GET_PARTITION_INFO, |
| 773 | &pi, sizeof(PARTITION_INFORMATION), |
| 774 | &pi, sizeof(PARTITION_INFORMATION)); |
| 775 | |
| 776 | |
| 777 | if(NT_SUCCESS(Status)) |
| 778 | { |
| 779 | *FsSize = pi.PartitionLength.QuadPart; |
| 780 | } |
| 781 | else if(STATUS_INVALID_DEVICE_REQUEST == Status) |
| 782 | { |
| 783 | // |
| 784 | // No partitions: get device info. |
| 785 | // |
| 786 | |
| 787 | RtlZeroMemory(&gi, sizeof(DISK_GEOMETRY)); |
| 788 | |
| 789 | Status = NtDeviceIoControlFile( |
| 790 | h, NULL, NULL, NULL, &IoStatusBlock, IOCTL_DISK_GET_DRIVE_GEOMETRY, |
| 791 | &gi, sizeof(DISK_GEOMETRY), |
| 792 | &gi, sizeof(DISK_GEOMETRY)); |
| 793 | |
| 794 | |
| 795 | if(NT_SUCCESS(Status)) |
| 796 | { |
| 797 | *FsSize = |
| 798 | gi.BytesPerSector * |
| 799 | gi.SectorsPerTrack * |
| 800 | gi.TracksPerCylinder * |
| 801 | gi.Cylinders.QuadPart; |
| 802 | } |
| 803 | |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | |
| 808 | |
| 809 | // |
| 810 | // Open device by name. |
| 811 | // |
| 812 | |
| 813 | static |
| 814 | BOOLEAN |
| 815 | _Ext2OpenDevice( |
| 816 | IN PCSTR Name, |
| 817 | IN BOOLEAN ReadOnly, |
| 818 | OUT PHANDLE Handle, |
| 819 | OUT PBOOLEAN OpenedReadonly OPTIONAL, |
| 820 | OUT unsigned *Errno OPTIONAL |
| 821 | ) |
| 822 | { |
| 823 | CHAR NormalizedDeviceName[512]; |
| 824 | NTSTATUS Status; |
| 825 | |
| 826 | if(NULL == Name) |
| 827 | { |
| 828 | // |
| 829 | // Set not found |
| 830 | // |
| 831 | |
| 832 | if(ARGUMENT_PRESENT(Errno)) |
| 833 | *Errno = ENOENT; |
| 834 | |
| 835 | return FALSE; |
| 836 | } |
| 837 | |
| 838 | |
| 839 | if((((*Name) | 0x20) >= 'a') && (((*Name) | 0x20) <= 'z') && |
| 840 | (':' == *(Name + 1)) && ('\0' == *(Name + 2))) |
| 841 | { |
| 842 | Status = _OpenDriveLetter(*Name, ReadOnly, Handle, OpenedReadonly); |
| 843 | } |
| 844 | else |
| 845 | { |
| 846 | // |
| 847 | // Make name |
| 848 | // |
| 849 | |
| 850 | Name = _NormalizeDeviceName(Name, NormalizedDeviceName); |
| 851 | |
| 852 | if(NULL == Name) |
| 853 | { |
| 854 | // |
| 855 | // Set not found |
| 856 | // |
| 857 | |
| 858 | if(ARGUMENT_PRESENT(Errno)) |
| 859 | *Errno = ENOENT; |
| 860 | |
| 861 | return FALSE; |
| 862 | } |
| 863 | |
| 864 | // |
| 865 | // Try to open it |
| 866 | // |
| 867 | |
| 868 | Status = _OpenNtName(Name, ReadOnly, Handle, OpenedReadonly); |
| 869 | } |
| 870 | |
| 871 | |
| 872 | if(!NT_SUCCESS(Status)) |
| 873 | { |
| 874 | if(ARGUMENT_PRESENT(Errno)) |
| 875 | *Errno = _MapNtStatus(Status); |
| 876 | |
| 877 | return FALSE; |
| 878 | } |
| 879 | |
| 880 | return TRUE; |
| 881 | } |
| 882 | |
| 883 | |
| 884 | // |
| 885 | // Raw block io. Sets dos errno |
| 886 | // |
| 887 | |
| 888 | static |
| 889 | BOOLEAN |
| 890 | _BlockIo( |
| 891 | IN HANDLE Handle, |
| 892 | IN LARGE_INTEGER Offset, |
| 893 | IN ULONG Bytes, |
| 894 | IN OUT PCHAR Buffer, |
| 895 | IN BOOLEAN Read, |
| 896 | OUT unsigned* Errno |
| 897 | ) |
| 898 | { |
| 899 | IO_STATUS_BLOCK IoStatusBlock; |
| 900 | NTSTATUS Status; |
| 901 | |
| 902 | // |
| 903 | // Should be aligned |
| 904 | // |
| 905 | |
| 906 | ASSERT(0 == (Bytes % 512)); |
| 907 | ASSERT(0 == (Offset.LowPart % 512)); |
| 908 | |
| 909 | |
| 910 | // |
| 911 | // perform io |
| 912 | // |
| 913 | |
| 914 | if(Read) |
| 915 | { |
| 916 | Status = NtReadFile(Handle, NULL, NULL, NULL, |
| 917 | &IoStatusBlock, Buffer, Bytes, &Offset, NULL); |
| 918 | } |
| 919 | else |
| 920 | { |
| 921 | Status = NtWriteFile(Handle, NULL, NULL, NULL, |
| 922 | &IoStatusBlock, Buffer, Bytes, &Offset, NULL); |
| 923 | } |
| 924 | |
| 925 | |
| 926 | // |
| 927 | // translate error |
| 928 | // |
| 929 | |
| 930 | if(NT_SUCCESS(Status)) |
| 931 | { |
| 932 | *Errno = 0; |
| 933 | return TRUE; |
| 934 | } |
| 935 | |
| 936 | *Errno = _MapNtStatus(Status); |
| 937 | |
| 938 | return FALSE; |
| 939 | } |
| 940 | |
| 941 | |
| 942 | |
| 943 | __inline |
| 944 | BOOLEAN |
| 945 | _RawWrite( |
| 946 | IN HANDLE Handle, |
| 947 | IN LARGE_INTEGER Offset, |
| 948 | IN ULONG Bytes, |
| 949 | OUT const CHAR* Buffer, |
| 950 | OUT unsigned* Errno |
| 951 | ) |
| 952 | { |
| 953 | return _BlockIo(Handle, Offset, Bytes, (PCHAR)Buffer, FALSE, Errno); |
| 954 | } |
| 955 | |
| 956 | __inline |
| 957 | BOOLEAN |
| 958 | _RawRead( |
| 959 | IN HANDLE Handle, |
| 960 | IN LARGE_INTEGER Offset, |
| 961 | IN ULONG Bytes, |
| 962 | IN PCHAR Buffer, |
| 963 | OUT unsigned* Errno |
| 964 | ) |
| 965 | { |
| 966 | return _BlockIo(Handle, Offset, Bytes, Buffer, TRUE, Errno); |
| 967 | } |
| 968 | |
| 969 | |
| 970 | |
| 971 | __inline |
| 972 | BOOLEAN |
| 973 | _SetPartType( |
| 974 | IN HANDLE Handle, |
| 975 | IN UCHAR Type |
| 976 | ) |
| 977 | { |
| 978 | IO_STATUS_BLOCK IoStatusBlock; |
| 979 | return STATUS_SUCCESS == NtDeviceIoControlFile( |
| 980 | Handle, NULL, NULL, NULL, &IoStatusBlock, IOCTL_DISK_SET_PARTITION_INFO, |
| 981 | &Type, sizeof(Type), |
| 982 | NULL, 0); |
| 983 | } |
| 984 | |
| 985 | |
| 986 | |
| 987 | //--------------------- interface part |
| 988 | |
| 989 | // |
| 990 | // Interface functions. |
| 991 | // Is_mounted is set to 1 if the device is mounted, 0 otherwise |
| 992 | // |
| 993 | |
| 994 | errcode_t |
| 995 | ext2fs_check_if_mounted(const char *file, int *mount_flags) |
| 996 | { |
| 997 | HANDLE h; |
| 998 | BOOLEAN Readonly; |
| 999 | |
| 1000 | *mount_flags = 0; |
| 1001 | |
| 1002 | if(!_Ext2OpenDevice(file, TRUE, &h, &Readonly, NULL)) |
| 1003 | { |
| 1004 | return 0; |
| 1005 | } |
| 1006 | |
| 1007 | |
| 1008 | __try{ |
| 1009 | *mount_flags &= _IsMounted(h) ? EXT2_MF_MOUNTED : 0; |
| 1010 | } |
| 1011 | __finally{ |
| 1012 | _CloseDisk(h); |
| 1013 | } |
| 1014 | |
| 1015 | return 0; |
| 1016 | } |
| 1017 | |
| 1018 | |
| 1019 | |
| 1020 | // |
| 1021 | // Returns the number of blocks in a partition |
| 1022 | // |
| 1023 | |
| 1024 | static __int64 FsSize = 0; |
| 1025 | static char knowndevice[1024] = ""; |
| 1026 | |
| 1027 | |
| 1028 | errcode_t |
| 1029 | ext2fs_get_device_size(const char *file, int blocksize, |
| 1030 | blk_t *retblocks) |
| 1031 | { |
| 1032 | HANDLE h; |
| 1033 | BOOLEAN Readonly; |
| 1034 | |
| 1035 | if((0 == FsSize) || (0 != strcmp(knowndevice, file))) |
| 1036 | { |
| 1037 | |
| 1038 | if(!_Ext2OpenDevice(file, TRUE, &h, &Readonly, NULL)) |
| 1039 | { |
| 1040 | return 0; |
| 1041 | } |
| 1042 | |
| 1043 | |
| 1044 | __try{ |
| 1045 | |
| 1046 | // |
| 1047 | // Get size |
| 1048 | // |
| 1049 | |
| 1050 | _GetDeviceSize(h, &FsSize); |
| 1051 | strcpy(knowndevice, file); |
| 1052 | } |
| 1053 | __finally{ |
| 1054 | _CloseDisk(h); |
| 1055 | } |
| 1056 | |
| 1057 | } |
| 1058 | |
| 1059 | *retblocks = (blk_t)(unsigned __int64)(FsSize / blocksize); |
| 1060 | UNREFERENCED_PARAMETER(file); |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | |
| 1065 | |
| 1066 | |
| 1067 | |
| 1068 | |
| 1069 | // |
| 1070 | // Table elements |
| 1071 | // |
| 1072 | |
| 1073 | |
| 1074 | static |
| 1075 | errcode_t |
| 1076 | nt_open(const char *name, int flags, io_channel *channel) |
| 1077 | { |
| 1078 | io_channel io = NULL; |
| 1079 | PNT_PRIVATE_DATA NtData = NULL; |
| 1080 | errcode_t Errno = 0; |
| 1081 | |
| 1082 | // |
| 1083 | // Check name |
| 1084 | // |
| 1085 | |
| 1086 | if (NULL == name) |
| 1087 | { |
| 1088 | return EXT2_ET_BAD_DEVICE_NAME; |
| 1089 | } |
| 1090 | |
| 1091 | __try{ |
| 1092 | |
| 1093 | // |
| 1094 | // Allocate channel handle |
| 1095 | // |
| 1096 | |
| 1097 | io = (io_channel) malloc(sizeof(struct struct_io_channel)); |
| 1098 | |
| 1099 | if (NULL == io) |
| 1100 | { |
| 1101 | Errno = ENOMEM; |
| 1102 | __leave; |
| 1103 | } |
| 1104 | |
| 1105 | RtlZeroMemory(io, sizeof(struct struct_io_channel)); |
| 1106 | io->magic = EXT2_ET_MAGIC_IO_CHANNEL; |
| 1107 | |
| 1108 | NtData = (PNT_PRIVATE_DATA)malloc(sizeof(NT_PRIVATE_DATA)); |
| 1109 | |
| 1110 | if (NULL == NtData) |
| 1111 | { |
| 1112 | Errno = ENOMEM; |
| 1113 | __leave; |
| 1114 | } |
| 1115 | |
| 1116 | |
| 1117 | io->manager = nt_io_manager(); |
| 1118 | io->name = malloc(strlen(name) + 1); |
| 1119 | if (NULL == io->name) |
| 1120 | { |
| 1121 | Errno = ENOMEM; |
| 1122 | __leave; |
| 1123 | } |
| 1124 | |
| 1125 | strcpy(io->name, name); |
| 1126 | io->private_data = NtData; |
| 1127 | io->block_size = 1024; |
| 1128 | io->read_error = 0; |
| 1129 | io->write_error = 0; |
| 1130 | io->refcount = 1; |
| 1131 | |
| 1132 | // |
| 1133 | // Initialize data |
| 1134 | // |
| 1135 | |
| 1136 | RtlZeroMemory(NtData, sizeof(NT_PRIVATE_DATA)); |
| 1137 | |
| 1138 | NtData->magic = EXT2_ET_MAGIC_NT_IO_CHANNEL; |
| 1139 | NtData->BufferBlockNumber = 0xffffffff; |
| 1140 | NtData->BufferSize = 1024; |
| 1141 | NtData->Buffer = malloc(NtData->BufferSize); |
| 1142 | |
| 1143 | if (NULL == NtData->Buffer) |
| 1144 | { |
| 1145 | Errno = ENOMEM; |
| 1146 | __leave; |
| 1147 | } |
| 1148 | |
| 1149 | // |
| 1150 | // Open it |
| 1151 | // |
| 1152 | |
| 1153 | if(!_Ext2OpenDevice(name, (BOOLEAN)!BooleanFlagOn(flags, EXT2_FLAG_RW), &NtData->Handle, &NtData->OpenedReadonly, &Errno)) |
| 1154 | { |
| 1155 | __leave; |
| 1156 | } |
| 1157 | |
| 1158 | |
| 1159 | // |
| 1160 | // get size |
| 1161 | // |
| 1162 | |
| 1163 | _GetDeviceSize(NtData->Handle, &FsSize); |
| 1164 | strcpy(knowndevice, name); |
| 1165 | |
| 1166 | |
| 1167 | // |
| 1168 | // Lock/dismount |
| 1169 | // |
| 1170 | |
Theodore Ts'o | fe70fd3 | 1999-10-26 02:34:47 +0000 | [diff] [blame] | 1171 | if(!NT_SUCCESS(_LockDrive(NtData->Handle)) /*|| !NT_SUCCESS(_DismountDrive(NtData->Handle))*/) |
Theodore Ts'o | aa4115a | 1999-10-21 19:33:18 +0000 | [diff] [blame] | 1172 | { |
| 1173 | NtData->OpenedReadonly = TRUE; |
| 1174 | } |
| 1175 | |
| 1176 | // |
| 1177 | // Done |
| 1178 | // |
| 1179 | |
| 1180 | *channel = io; |
| 1181 | |
| 1182 | |
| 1183 | } |
| 1184 | __finally{ |
| 1185 | |
| 1186 | if(0 != Errno) |
| 1187 | { |
| 1188 | // |
| 1189 | // Cleanup |
| 1190 | // |
| 1191 | |
| 1192 | if (NULL != io) |
| 1193 | { |
| 1194 | if(NULL != io->name) |
| 1195 | { |
| 1196 | free(io->name); |
| 1197 | } |
| 1198 | |
| 1199 | free(io); |
| 1200 | } |
| 1201 | |
| 1202 | if (NULL != NtData) |
| 1203 | { |
| 1204 | if(NULL != NtData->Handle) |
| 1205 | { |
| 1206 | _UnlockDrive(NtData->Handle); |
| 1207 | _CloseDisk(NtData->Handle); |
| 1208 | } |
| 1209 | |
| 1210 | if(NULL != NtData->Buffer) |
| 1211 | { |
| 1212 | free(NtData->Buffer); |
| 1213 | } |
| 1214 | |
| 1215 | free(NtData); |
| 1216 | } |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | return Errno; |
| 1221 | } |
| 1222 | |
| 1223 | |
| 1224 | // |
| 1225 | // Close api |
| 1226 | // |
| 1227 | |
| 1228 | static |
| 1229 | errcode_t |
| 1230 | nt_close(io_channel channel) |
| 1231 | { |
| 1232 | PNT_PRIVATE_DATA NtData = NULL; |
| 1233 | |
| 1234 | if(NULL == channel) |
| 1235 | { |
| 1236 | return 0; |
| 1237 | } |
| 1238 | |
| 1239 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| 1240 | NtData = (PNT_PRIVATE_DATA) channel->private_data; |
| 1241 | EXT2_CHECK_MAGIC(NtData, EXT2_ET_MAGIC_NT_IO_CHANNEL); |
| 1242 | |
| 1243 | if (--channel->refcount > 0) |
| 1244 | { |
| 1245 | return 0; |
| 1246 | } |
| 1247 | |
| 1248 | if(NULL != channel->name) |
| 1249 | { |
| 1250 | free(channel->name); |
| 1251 | } |
| 1252 | |
| 1253 | |
| 1254 | free(channel); |
| 1255 | |
| 1256 | if (NULL != NtData) |
| 1257 | { |
| 1258 | if(NULL != NtData->Handle) |
| 1259 | { |
| 1260 | _DismountDrive(NtData->Handle); |
| 1261 | _UnlockDrive(NtData->Handle); |
| 1262 | _CloseDisk(NtData->Handle); |
| 1263 | } |
| 1264 | |
| 1265 | if(NULL != NtData->Buffer) |
| 1266 | { |
| 1267 | free(NtData->Buffer); |
| 1268 | } |
| 1269 | |
| 1270 | free(NtData); |
| 1271 | } |
| 1272 | |
| 1273 | return 0; |
| 1274 | } |
| 1275 | |
| 1276 | |
| 1277 | |
| 1278 | // |
| 1279 | // set block size |
| 1280 | // |
| 1281 | |
| 1282 | static |
| 1283 | errcode_t |
| 1284 | nt_set_blksize(io_channel channel, int blksize) |
| 1285 | { |
| 1286 | PNT_PRIVATE_DATA NtData = NULL; |
| 1287 | |
| 1288 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| 1289 | NtData = (PNT_PRIVATE_DATA) channel->private_data; |
| 1290 | EXT2_CHECK_MAGIC(NtData, EXT2_ET_MAGIC_NT_IO_CHANNEL); |
| 1291 | |
| 1292 | if (channel->block_size != blksize) |
| 1293 | { |
| 1294 | channel->block_size = blksize; |
| 1295 | |
| 1296 | free(NtData->Buffer); |
| 1297 | NtData->BufferBlockNumber = 0xffffffff; |
| 1298 | NtData->BufferSize = channel->block_size; |
| 1299 | ASSERT(0 == (NtData->BufferSize % 512)); |
| 1300 | |
| 1301 | NtData->Buffer = malloc(NtData->BufferSize); |
| 1302 | |
| 1303 | if (NULL == NtData->Buffer) |
| 1304 | { |
| 1305 | return ENOMEM; |
| 1306 | } |
| 1307 | |
| 1308 | } |
| 1309 | |
| 1310 | return 0; |
| 1311 | } |
| 1312 | |
| 1313 | |
| 1314 | // |
| 1315 | // read block |
| 1316 | // |
| 1317 | |
| 1318 | static |
| 1319 | errcode_t |
| 1320 | nt_read_blk(io_channel channel, unsigned long block, |
| 1321 | int count, void *buf) |
| 1322 | { |
| 1323 | PVOID BufferToRead; |
| 1324 | ULONG SizeToRead; |
| 1325 | ULONG Size; |
| 1326 | LARGE_INTEGER Offset; |
| 1327 | PNT_PRIVATE_DATA NtData = NULL; |
| 1328 | unsigned Errno = 0; |
| 1329 | |
| 1330 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| 1331 | NtData = (PNT_PRIVATE_DATA) channel->private_data; |
| 1332 | EXT2_CHECK_MAGIC(NtData, EXT2_ET_MAGIC_NT_IO_CHANNEL); |
| 1333 | |
| 1334 | // |
| 1335 | // If it's in the cache, use it! |
| 1336 | // |
| 1337 | |
| 1338 | if ((1 == count) && |
| 1339 | (block == NtData->BufferBlockNumber) && |
| 1340 | (NtData->BufferBlockNumber != 0xffffffff)) |
| 1341 | { |
| 1342 | memcpy(buf, NtData->Buffer, channel->block_size); |
| 1343 | return 0; |
| 1344 | } |
| 1345 | |
| 1346 | Size = (count < 0) ? (ULONG)(-count) : (ULONG)(count * channel->block_size); |
| 1347 | |
| 1348 | Offset.QuadPart = block * channel->block_size; |
| 1349 | |
| 1350 | // |
| 1351 | // If not fit to the block |
| 1352 | // |
| 1353 | |
| 1354 | if(Size <= NtData->BufferSize) |
| 1355 | { |
| 1356 | // |
| 1357 | // Update the cache |
| 1358 | // |
| 1359 | |
| 1360 | NtData->BufferBlockNumber = block; |
| 1361 | BufferToRead = NtData->Buffer; |
| 1362 | SizeToRead = NtData->BufferSize; |
| 1363 | } |
| 1364 | else |
| 1365 | { |
| 1366 | SizeToRead = Size; |
| 1367 | BufferToRead = buf; |
| 1368 | ASSERT(0 == (SizeToRead % channel->block_size)); |
| 1369 | } |
| 1370 | |
| 1371 | if(!_RawRead(NtData->Handle, Offset, SizeToRead, BufferToRead, &Errno)) |
| 1372 | { |
| 1373 | |
| 1374 | if (channel->read_error) |
| 1375 | { |
| 1376 | return (channel->read_error)(channel, block, count, buf, |
| 1377 | Size, 0, Errno); |
| 1378 | } |
| 1379 | else |
| 1380 | { |
| 1381 | return Errno; |
| 1382 | } |
| 1383 | } |
| 1384 | |
| 1385 | |
| 1386 | if(BufferToRead != buf) |
| 1387 | { |
| 1388 | ASSERT(Size <= SizeToRead); |
| 1389 | memcpy(buf, BufferToRead, Size); |
| 1390 | } |
| 1391 | |
| 1392 | return 0; |
| 1393 | } |
| 1394 | |
| 1395 | |
| 1396 | // |
| 1397 | // write block |
| 1398 | // |
| 1399 | |
| 1400 | static |
| 1401 | errcode_t |
| 1402 | nt_write_blk(io_channel channel, unsigned long block, |
| 1403 | int count, const void *buf) |
| 1404 | { |
| 1405 | ULONG SizeToWrite; |
| 1406 | LARGE_INTEGER Offset; |
| 1407 | PNT_PRIVATE_DATA NtData = NULL; |
| 1408 | unsigned Errno = 0; |
| 1409 | |
| 1410 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| 1411 | NtData = (PNT_PRIVATE_DATA) channel->private_data; |
| 1412 | EXT2_CHECK_MAGIC(NtData, EXT2_ET_MAGIC_NT_IO_CHANNEL); |
| 1413 | |
| 1414 | if(NtData->OpenedReadonly) |
| 1415 | { |
| 1416 | return EACCES; |
| 1417 | } |
| 1418 | |
| 1419 | if (count == 1) |
| 1420 | { |
| 1421 | SizeToWrite = channel->block_size; |
| 1422 | } |
| 1423 | else |
| 1424 | { |
| 1425 | NtData->BufferBlockNumber = 0xffffffff; |
| 1426 | |
| 1427 | if (count < 0) |
| 1428 | { |
| 1429 | SizeToWrite = (ULONG)(-count); |
| 1430 | } |
| 1431 | else |
| 1432 | { |
| 1433 | SizeToWrite = (ULONG)(count * channel->block_size); |
| 1434 | } |
| 1435 | } |
| 1436 | |
| 1437 | |
| 1438 | ASSERT(0 == (SizeToWrite % 512)); |
| 1439 | Offset.QuadPart = block * channel->block_size; |
| 1440 | |
| 1441 | if(!_RawWrite(NtData->Handle, Offset, SizeToWrite, buf, &Errno)) |
| 1442 | { |
| 1443 | if (channel->write_error) |
| 1444 | { |
| 1445 | return (channel->write_error)(channel, block, count, buf, |
| 1446 | SizeToWrite, 0, Errno); |
| 1447 | } |
| 1448 | else |
| 1449 | { |
| 1450 | return Errno; |
| 1451 | } |
| 1452 | } |
| 1453 | |
| 1454 | |
| 1455 | // |
| 1456 | // Stash a copy. |
| 1457 | // |
| 1458 | |
| 1459 | if(SizeToWrite >= NtData->BufferSize) |
| 1460 | { |
| 1461 | NtData->BufferBlockNumber = block; |
| 1462 | memcpy(NtData->Buffer, buf, NtData->BufferSize); |
| 1463 | } |
| 1464 | |
| 1465 | NtData->Written = TRUE; |
| 1466 | |
| 1467 | return 0; |
| 1468 | |
| 1469 | } |
| 1470 | |
| 1471 | |
| 1472 | |
| 1473 | // |
| 1474 | // Flush data buffers to disk. Since we are currently using a |
| 1475 | // write-through cache, this is a no-op. |
| 1476 | // |
| 1477 | |
| 1478 | static |
| 1479 | errcode_t |
| 1480 | nt_flush(io_channel channel) |
| 1481 | { |
| 1482 | PNT_PRIVATE_DATA NtData = NULL; |
| 1483 | |
| 1484 | EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL); |
| 1485 | NtData = (PNT_PRIVATE_DATA) channel->private_data; |
| 1486 | EXT2_CHECK_MAGIC(NtData, EXT2_ET_MAGIC_NT_IO_CHANNEL); |
| 1487 | |
| 1488 | if(NtData->OpenedReadonly) |
| 1489 | { |
| 1490 | return 0; // EACCESS; |
| 1491 | } |
| 1492 | |
| 1493 | |
| 1494 | // |
| 1495 | // Flush file buffers. |
| 1496 | // |
| 1497 | |
| 1498 | _FlushDrive(NtData->Handle); |
| 1499 | |
| 1500 | |
| 1501 | // |
| 1502 | // Test and correct partition type. |
| 1503 | // |
| 1504 | |
| 1505 | if(NtData->Written) |
| 1506 | { |
| 1507 | _SetPartType(NtData->Handle, 0x83); |
| 1508 | } |
| 1509 | |
| 1510 | return 0; |
| 1511 | } |
| 1512 | |
| 1513 | |