2 * Block driver for RAW files (win32)
4 * Copyright (c) 2006 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 #include "qemu-common.h"
25 #include "qemu/timer.h"
26 #include "block/block_int.h"
27 #include "qemu/module.h"
30 #include "block/thread-pool.h"
37 #define FTYPE_HARDDISK 2
39 static QEMUWin32AIOState *aio;
41 typedef struct RawWin32AIOData {
44 struct iovec *aio_iov;
51 typedef struct BDRVRawState {
54 char drive_path[16]; /* format: "d:\" */
55 QEMUWin32AIOState *aio;
59 * Read/writes the data to/from a given linear buffer.
61 * Returns the number of bytes handles or -errno in case of an error. Short
62 * reads are only returned if the end of the file is reached.
64 static size_t handle_aiocb_rw(RawWin32AIOData *aiocb)
69 for (i = 0; i < aiocb->aio_niov; i++) {
71 DWORD ret, ret_count, len;
73 memset(&ov, 0, sizeof(ov));
74 ov.Offset = (aiocb->aio_offset + offset);
75 ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32;
76 len = aiocb->aio_iov[i].iov_len;
77 if (aiocb->aio_type & QEMU_AIO_WRITE) {
78 ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
79 len, &ret_count, &ov);
81 ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
82 len, &ret_count, &ov);
87 if (ret_count != len) {
96 static int aio_worker(void *arg)
98 RawWin32AIOData *aiocb = arg;
102 switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
104 count = handle_aiocb_rw(aiocb);
105 if (count < aiocb->aio_nbytes && aiocb->bs->growable) {
106 /* A short read means that we have reached EOF. Pad the buffer
107 * with zeros for bytes after EOF. */
108 iov_memset(aiocb->aio_iov, aiocb->aio_niov, count,
109 0, aiocb->aio_nbytes - count);
111 count = aiocb->aio_nbytes;
113 if (count == aiocb->aio_nbytes) {
120 count = handle_aiocb_rw(aiocb);
121 if (count == aiocb->aio_nbytes) {
128 if (!FlushFileBuffers(aiocb->hfile)) {
133 fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
138 g_slice_free(RawWin32AIOData, aiocb);
142 static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
143 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
144 BlockDriverCompletionFunc *cb, void *opaque, int type)
146 RawWin32AIOData *acb = g_slice_new(RawWin32AIOData);
150 acb->aio_type = type;
153 acb->aio_iov = qiov->iov;
154 acb->aio_niov = qiov->niov;
156 acb->aio_nbytes = nb_sectors * 512;
157 acb->aio_offset = sector_num * 512;
159 trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
160 return thread_pool_submit_aio(aio_worker, acb, cb, opaque);
163 int qemu_ftruncate64(int fd, int64_t length)
171 if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
174 h = (HANDLE)_get_osfhandle(fd);
176 /* get current position, ftruncate do not change position */
178 li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
179 if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
184 dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
185 if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
188 res = SetEndOfFile(h);
190 /* back to old position */
191 SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
195 static int set_sparse(int fd)
198 return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
199 NULL, 0, NULL, 0, &returned, NULL);
202 static void raw_parse_flags(int flags, int *access_flags, DWORD *overlapped)
204 assert(access_flags != NULL);
205 assert(overlapped != NULL);
207 if (flags & BDRV_O_RDWR) {
208 *access_flags = GENERIC_READ | GENERIC_WRITE;
210 *access_flags = GENERIC_READ;
213 *overlapped = FILE_ATTRIBUTE_NORMAL;
214 if (flags & BDRV_O_NATIVE_AIO) {
215 *overlapped |= FILE_FLAG_OVERLAPPED;
217 if (flags & BDRV_O_NOCACHE) {
218 *overlapped |= FILE_FLAG_NO_BUFFERING;
222 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
224 BDRVRawState *s = bs->opaque;
228 s->type = FTYPE_FILE;
230 raw_parse_flags(flags, &access_flags, &overlapped);
232 if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) {
233 aio = win32_aio_init();
239 s->hfile = CreateFile(filename, access_flags,
240 FILE_SHARE_READ, NULL,
241 OPEN_EXISTING, overlapped, NULL);
242 if (s->hfile == INVALID_HANDLE_VALUE) {
243 int err = GetLastError();
245 if (err == ERROR_ACCESS_DENIED)
250 if (flags & BDRV_O_NATIVE_AIO) {
251 int ret = win32_aio_attach(aio, s->hfile);
253 CloseHandle(s->hfile);
261 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
262 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
263 BlockDriverCompletionFunc *cb, void *opaque)
265 BDRVRawState *s = bs->opaque;
267 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
268 nb_sectors, cb, opaque, QEMU_AIO_READ);
270 return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
271 cb, opaque, QEMU_AIO_READ);
275 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
276 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
277 BlockDriverCompletionFunc *cb, void *opaque)
279 BDRVRawState *s = bs->opaque;
281 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
282 nb_sectors, cb, opaque, QEMU_AIO_WRITE);
284 return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
285 cb, opaque, QEMU_AIO_WRITE);
289 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
290 BlockDriverCompletionFunc *cb, void *opaque)
292 BDRVRawState *s = bs->opaque;
293 return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
296 static void raw_close(BlockDriverState *bs)
298 BDRVRawState *s = bs->opaque;
299 CloseHandle(s->hfile);
302 static int raw_truncate(BlockDriverState *bs, int64_t offset)
304 BDRVRawState *s = bs->opaque;
312 * An error has occurred if the return value is INVALID_SET_FILE_POINTER
313 * and GetLastError doesn't return NO_ERROR.
315 dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
316 if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
317 fprintf(stderr, "SetFilePointer error: %d\n", GetLastError());
320 if (SetEndOfFile(s->hfile) == 0) {
321 fprintf(stderr, "SetEndOfFile error: %d\n", GetLastError());
327 static int64_t raw_getlength(BlockDriverState *bs)
329 BDRVRawState *s = bs->opaque;
331 ULARGE_INTEGER available, total, total_free;
338 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
339 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
343 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
345 l.QuadPart = total.QuadPart;
348 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
349 NULL, 0, &dg, sizeof(dg), &count, NULL);
360 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
362 typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
364 get_compressed_t get_compressed;
366 const char *filename = bs->filename;
367 /* WinNT support GetCompressedFileSize to determine allocate size */
369 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
370 "GetCompressedFileSizeA");
371 if (get_compressed) {
373 low = get_compressed(filename, &high);
374 if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
375 return (((int64_t) high) << 32) + low;
379 if (_stati64(filename, &st) < 0) {
385 static int raw_create(const char *filename, QEMUOptionParameter *options)
388 int64_t total_size = 0;
390 /* Read out options */
391 while (options && options->name) {
392 if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
393 total_size = options->value.n / 512;
398 fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
403 ftruncate(fd, total_size * 512);
408 static QEMUOptionParameter raw_create_options[] = {
410 .name = BLOCK_OPT_SIZE,
412 .help = "Virtual disk size"
417 static BlockDriver bdrv_file = {
418 .format_name = "file",
419 .protocol_name = "file",
420 .instance_size = sizeof(BDRVRawState),
421 .bdrv_file_open = raw_open,
422 .bdrv_close = raw_close,
423 .bdrv_create = raw_create,
425 .bdrv_aio_readv = raw_aio_readv,
426 .bdrv_aio_writev = raw_aio_writev,
427 .bdrv_aio_flush = raw_aio_flush,
429 .bdrv_truncate = raw_truncate,
430 .bdrv_getlength = raw_getlength,
431 .bdrv_get_allocated_file_size
432 = raw_get_allocated_file_size,
434 .create_options = raw_create_options,
437 /***********************************************/
440 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
442 char drives[256], *pdrv = drives;
445 memset(drives, 0, sizeof(drives));
446 GetLogicalDriveStrings(sizeof(drives), drives);
447 while(pdrv[0] != '\0') {
448 type = GetDriveType(pdrv);
451 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
455 pdrv += lstrlen(pdrv) + 1;
460 static int find_device_type(BlockDriverState *bs, const char *filename)
462 BDRVRawState *s = bs->opaque;
466 if (strstart(filename, "\\\\.\\", &p) ||
467 strstart(filename, "//./", &p)) {
468 if (stristart(p, "PhysicalDrive", NULL))
469 return FTYPE_HARDDISK;
470 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
471 type = GetDriveType(s->drive_path);
473 case DRIVE_REMOVABLE:
475 return FTYPE_HARDDISK;
486 static int hdev_probe_device(const char *filename)
488 if (strstart(filename, "/dev/cdrom", NULL))
490 if (is_windows_drive(filename))
495 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
497 BDRVRawState *s = bs->opaque;
498 int access_flags, create_flags;
500 char device_name[64];
502 if (strstart(filename, "/dev/cdrom", NULL)) {
503 if (find_cdrom(device_name, sizeof(device_name)) < 0)
505 filename = device_name;
507 /* transform drive letters into device name */
508 if (((filename[0] >= 'a' && filename[0] <= 'z') ||
509 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
510 filename[1] == ':' && filename[2] == '\0') {
511 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
512 filename = device_name;
515 s->type = find_device_type(bs, filename);
517 raw_parse_flags(flags, &access_flags, &overlapped);
519 create_flags = OPEN_EXISTING;
521 s->hfile = CreateFile(filename, access_flags,
522 FILE_SHARE_READ, NULL,
523 create_flags, overlapped, NULL);
524 if (s->hfile == INVALID_HANDLE_VALUE) {
525 int err = GetLastError();
527 if (err == ERROR_ACCESS_DENIED)
534 static int hdev_has_zero_init(BlockDriverState *bs)
539 static BlockDriver bdrv_host_device = {
540 .format_name = "host_device",
541 .protocol_name = "host_device",
542 .instance_size = sizeof(BDRVRawState),
543 .bdrv_probe_device = hdev_probe_device,
544 .bdrv_file_open = hdev_open,
545 .bdrv_close = raw_close,
546 .bdrv_has_zero_init = hdev_has_zero_init,
548 .bdrv_aio_readv = raw_aio_readv,
549 .bdrv_aio_writev = raw_aio_writev,
550 .bdrv_aio_flush = raw_aio_flush,
552 .bdrv_getlength = raw_getlength,
553 .bdrv_get_allocated_file_size
554 = raw_get_allocated_file_size,
557 static void bdrv_file_init(void)
559 bdrv_register(&bdrv_file);
560 bdrv_register(&bdrv_host_device);
563 block_init(bdrv_file_init);