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);
151 acb->aio_type = type;
154 acb->aio_iov = qiov->iov;
155 acb->aio_niov = qiov->niov;
157 acb->aio_nbytes = nb_sectors * 512;
158 acb->aio_offset = sector_num * 512;
160 trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
161 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
162 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
165 int qemu_ftruncate64(int fd, int64_t length)
173 if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
176 h = (HANDLE)_get_osfhandle(fd);
178 /* get current position, ftruncate do not change position */
180 li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
181 if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
186 dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
187 if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
190 res = SetEndOfFile(h);
192 /* back to old position */
193 SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
197 static int set_sparse(int fd)
200 return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
201 NULL, 0, NULL, 0, &returned, NULL);
204 static void raw_parse_flags(int flags, int *access_flags, DWORD *overlapped)
206 assert(access_flags != NULL);
207 assert(overlapped != NULL);
209 if (flags & BDRV_O_RDWR) {
210 *access_flags = GENERIC_READ | GENERIC_WRITE;
212 *access_flags = GENERIC_READ;
215 *overlapped = FILE_ATTRIBUTE_NORMAL;
216 if (flags & BDRV_O_NATIVE_AIO) {
217 *overlapped |= FILE_FLAG_OVERLAPPED;
219 if (flags & BDRV_O_NOCACHE) {
220 *overlapped |= FILE_FLAG_NO_BUFFERING;
224 static QemuOptsList raw_runtime_opts = {
226 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
230 .type = QEMU_OPT_STRING,
231 .help = "File name of the image",
233 { /* end of list */ }
237 static int raw_open(BlockDriverState *bs, QDict *options, int flags)
239 BDRVRawState *s = bs->opaque;
243 Error *local_err = NULL;
244 const char *filename;
247 s->type = FTYPE_FILE;
249 opts = qemu_opts_create_nofail(&raw_runtime_opts);
250 qemu_opts_absorb_qdict(opts, options, &local_err);
251 if (error_is_set(&local_err)) {
252 qerror_report_err(local_err);
253 error_free(local_err);
258 filename = qemu_opt_get(opts, "filename");
260 raw_parse_flags(flags, &access_flags, &overlapped);
262 if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) {
263 aio = win32_aio_init();
270 s->hfile = CreateFile(filename, access_flags,
271 FILE_SHARE_READ, NULL,
272 OPEN_EXISTING, overlapped, NULL);
273 if (s->hfile == INVALID_HANDLE_VALUE) {
274 int err = GetLastError();
276 if (err == ERROR_ACCESS_DENIED) {
284 if (flags & BDRV_O_NATIVE_AIO) {
285 ret = win32_aio_attach(aio, s->hfile);
287 CloseHandle(s->hfile);
299 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
300 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
301 BlockDriverCompletionFunc *cb, void *opaque)
303 BDRVRawState *s = bs->opaque;
305 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
306 nb_sectors, cb, opaque, QEMU_AIO_READ);
308 return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
309 cb, opaque, QEMU_AIO_READ);
313 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
314 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
315 BlockDriverCompletionFunc *cb, void *opaque)
317 BDRVRawState *s = bs->opaque;
319 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
320 nb_sectors, cb, opaque, QEMU_AIO_WRITE);
322 return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
323 cb, opaque, QEMU_AIO_WRITE);
327 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
328 BlockDriverCompletionFunc *cb, void *opaque)
330 BDRVRawState *s = bs->opaque;
331 return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
334 static void raw_close(BlockDriverState *bs)
336 BDRVRawState *s = bs->opaque;
337 CloseHandle(s->hfile);
340 static int raw_truncate(BlockDriverState *bs, int64_t offset)
342 BDRVRawState *s = bs->opaque;
350 * An error has occurred if the return value is INVALID_SET_FILE_POINTER
351 * and GetLastError doesn't return NO_ERROR.
353 dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
354 if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
355 fprintf(stderr, "SetFilePointer error: %lu\n", GetLastError());
358 if (SetEndOfFile(s->hfile) == 0) {
359 fprintf(stderr, "SetEndOfFile error: %lu\n", GetLastError());
365 static int64_t raw_getlength(BlockDriverState *bs)
367 BDRVRawState *s = bs->opaque;
369 ULARGE_INTEGER available, total, total_free;
376 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
377 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
381 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
383 l.QuadPart = total.QuadPart;
386 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
387 NULL, 0, &dg, sizeof(dg), &count, NULL);
398 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
400 typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
402 get_compressed_t get_compressed;
404 const char *filename = bs->filename;
405 /* WinNT support GetCompressedFileSize to determine allocate size */
407 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
408 "GetCompressedFileSizeA");
409 if (get_compressed) {
411 low = get_compressed(filename, &high);
412 if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
413 return (((int64_t) high) << 32) + low;
417 if (_stati64(filename, &st) < 0) {
423 static int raw_create(const char *filename, QEMUOptionParameter *options)
426 int64_t total_size = 0;
428 /* Read out options */
429 while (options && options->name) {
430 if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
431 total_size = options->value.n / 512;
436 fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
441 ftruncate(fd, total_size * 512);
446 static QEMUOptionParameter raw_create_options[] = {
448 .name = BLOCK_OPT_SIZE,
450 .help = "Virtual disk size"
455 static BlockDriver bdrv_file = {
456 .format_name = "file",
457 .protocol_name = "file",
458 .instance_size = sizeof(BDRVRawState),
459 .bdrv_file_open = raw_open,
460 .bdrv_close = raw_close,
461 .bdrv_create = raw_create,
462 .bdrv_has_zero_init = bdrv_has_zero_init_1,
464 .bdrv_aio_readv = raw_aio_readv,
465 .bdrv_aio_writev = raw_aio_writev,
466 .bdrv_aio_flush = raw_aio_flush,
468 .bdrv_truncate = raw_truncate,
469 .bdrv_getlength = raw_getlength,
470 .bdrv_get_allocated_file_size
471 = raw_get_allocated_file_size,
473 .create_options = raw_create_options,
476 /***********************************************/
479 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
481 char drives[256], *pdrv = drives;
484 memset(drives, 0, sizeof(drives));
485 GetLogicalDriveStrings(sizeof(drives), drives);
486 while(pdrv[0] != '\0') {
487 type = GetDriveType(pdrv);
490 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
494 pdrv += lstrlen(pdrv) + 1;
499 static int find_device_type(BlockDriverState *bs, const char *filename)
501 BDRVRawState *s = bs->opaque;
505 if (strstart(filename, "\\\\.\\", &p) ||
506 strstart(filename, "//./", &p)) {
507 if (stristart(p, "PhysicalDrive", NULL))
508 return FTYPE_HARDDISK;
509 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
510 type = GetDriveType(s->drive_path);
512 case DRIVE_REMOVABLE:
514 return FTYPE_HARDDISK;
525 static int hdev_probe_device(const char *filename)
527 if (strstart(filename, "/dev/cdrom", NULL))
529 if (is_windows_drive(filename))
534 static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
536 BDRVRawState *s = bs->opaque;
537 int access_flags, create_flags;
540 char device_name[64];
542 Error *local_err = NULL;
543 const char *filename;
545 QemuOpts *opts = qemu_opts_create_nofail(&raw_runtime_opts);
546 qemu_opts_absorb_qdict(opts, options, &local_err);
547 if (error_is_set(&local_err)) {
548 qerror_report_err(local_err);
549 error_free(local_err);
554 filename = qemu_opt_get(opts, "filename");
556 if (strstart(filename, "/dev/cdrom", NULL)) {
557 if (find_cdrom(device_name, sizeof(device_name)) < 0) {
561 filename = device_name;
563 /* transform drive letters into device name */
564 if (((filename[0] >= 'a' && filename[0] <= 'z') ||
565 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
566 filename[1] == ':' && filename[2] == '\0') {
567 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
568 filename = device_name;
571 s->type = find_device_type(bs, filename);
573 raw_parse_flags(flags, &access_flags, &overlapped);
575 create_flags = OPEN_EXISTING;
577 s->hfile = CreateFile(filename, access_flags,
578 FILE_SHARE_READ, NULL,
579 create_flags, overlapped, NULL);
580 if (s->hfile == INVALID_HANDLE_VALUE) {
581 int err = GetLastError();
583 if (err == ERROR_ACCESS_DENIED) {
596 static BlockDriver bdrv_host_device = {
597 .format_name = "host_device",
598 .protocol_name = "host_device",
599 .instance_size = sizeof(BDRVRawState),
600 .bdrv_probe_device = hdev_probe_device,
601 .bdrv_file_open = hdev_open,
602 .bdrv_close = raw_close,
604 .bdrv_aio_readv = raw_aio_readv,
605 .bdrv_aio_writev = raw_aio_writev,
606 .bdrv_aio_flush = raw_aio_flush,
608 .bdrv_getlength = raw_getlength,
609 .bdrv_get_allocated_file_size
610 = raw_get_allocated_file_size,
613 static void bdrv_file_init(void)
615 bdrv_register(&bdrv_file);
616 bdrv_register(&bdrv_host_device);
619 block_init(bdrv_file_init);