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) {
97 static int aio_worker(void *arg)
99 RawWin32AIOData *aiocb = arg;
103 switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
105 count = handle_aiocb_rw(aiocb);
106 if (count < aiocb->aio_nbytes && aiocb->bs->growable) {
107 /* A short read means that we have reached EOF. Pad the buffer
108 * with zeros for bytes after EOF. */
109 iov_memset(aiocb->aio_iov, aiocb->aio_niov, count,
110 0, aiocb->aio_nbytes - count);
112 count = aiocb->aio_nbytes;
114 if (count == aiocb->aio_nbytes) {
121 count = handle_aiocb_rw(aiocb);
122 if (count == aiocb->aio_nbytes) {
129 if (!FlushFileBuffers(aiocb->hfile)) {
134 fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
139 g_slice_free(RawWin32AIOData, aiocb);
143 static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
144 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
145 BlockDriverCompletionFunc *cb, void *opaque, int type)
147 RawWin32AIOData *acb = g_slice_new(RawWin32AIOData);
152 acb->aio_type = type;
155 acb->aio_iov = qiov->iov;
156 acb->aio_niov = qiov->niov;
158 acb->aio_nbytes = nb_sectors * 512;
159 acb->aio_offset = sector_num * 512;
161 trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
162 pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
163 return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
166 int qemu_ftruncate64(int fd, int64_t length)
174 if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
177 h = (HANDLE)_get_osfhandle(fd);
179 /* get current position, ftruncate do not change position */
181 li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
182 if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
187 dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
188 if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
191 res = SetEndOfFile(h);
193 /* back to old position */
194 SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
198 static int set_sparse(int fd)
201 return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
202 NULL, 0, NULL, 0, &returned, NULL);
205 static void raw_parse_flags(int flags, int *access_flags, DWORD *overlapped)
207 assert(access_flags != NULL);
208 assert(overlapped != NULL);
210 if (flags & BDRV_O_RDWR) {
211 *access_flags = GENERIC_READ | GENERIC_WRITE;
213 *access_flags = GENERIC_READ;
216 *overlapped = FILE_ATTRIBUTE_NORMAL;
217 if (flags & BDRV_O_NATIVE_AIO) {
218 *overlapped |= FILE_FLAG_OVERLAPPED;
220 if (flags & BDRV_O_NOCACHE) {
221 *overlapped |= FILE_FLAG_NO_BUFFERING;
225 static QemuOptsList raw_runtime_opts = {
227 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
231 .type = QEMU_OPT_STRING,
232 .help = "File name of the image",
234 { /* end of list */ }
238 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
241 BDRVRawState *s = bs->opaque;
245 Error *local_err = NULL;
246 const char *filename;
249 s->type = FTYPE_FILE;
251 opts = qemu_opts_create_nofail(&raw_runtime_opts);
252 qemu_opts_absorb_qdict(opts, options, &local_err);
253 if (error_is_set(&local_err)) {
254 qerror_report_err(local_err);
255 error_free(local_err);
260 filename = qemu_opt_get(opts, "filename");
262 raw_parse_flags(flags, &access_flags, &overlapped);
264 if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) {
265 aio = win32_aio_init();
272 s->hfile = CreateFile(filename, access_flags,
273 FILE_SHARE_READ, NULL,
274 OPEN_EXISTING, overlapped, NULL);
275 if (s->hfile == INVALID_HANDLE_VALUE) {
276 int err = GetLastError();
278 if (err == ERROR_ACCESS_DENIED) {
286 if (flags & BDRV_O_NATIVE_AIO) {
287 ret = win32_aio_attach(aio, s->hfile);
289 CloseHandle(s->hfile);
301 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
302 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
303 BlockDriverCompletionFunc *cb, void *opaque)
305 BDRVRawState *s = bs->opaque;
307 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
308 nb_sectors, cb, opaque, QEMU_AIO_READ);
310 return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
311 cb, opaque, QEMU_AIO_READ);
315 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
316 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
317 BlockDriverCompletionFunc *cb, void *opaque)
319 BDRVRawState *s = bs->opaque;
321 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
322 nb_sectors, cb, opaque, QEMU_AIO_WRITE);
324 return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
325 cb, opaque, QEMU_AIO_WRITE);
329 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
330 BlockDriverCompletionFunc *cb, void *opaque)
332 BDRVRawState *s = bs->opaque;
333 return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
336 static void raw_close(BlockDriverState *bs)
338 BDRVRawState *s = bs->opaque;
339 CloseHandle(s->hfile);
342 static int raw_truncate(BlockDriverState *bs, int64_t offset)
344 BDRVRawState *s = bs->opaque;
352 * An error has occurred if the return value is INVALID_SET_FILE_POINTER
353 * and GetLastError doesn't return NO_ERROR.
355 dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
356 if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
357 fprintf(stderr, "SetFilePointer error: %lu\n", GetLastError());
360 if (SetEndOfFile(s->hfile) == 0) {
361 fprintf(stderr, "SetEndOfFile error: %lu\n", GetLastError());
367 static int64_t raw_getlength(BlockDriverState *bs)
369 BDRVRawState *s = bs->opaque;
371 ULARGE_INTEGER available, total, total_free;
378 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
379 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
383 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
385 l.QuadPart = total.QuadPart;
388 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
389 NULL, 0, &dg, sizeof(dg), &count, NULL);
400 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
402 typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
404 get_compressed_t get_compressed;
406 const char *filename = bs->filename;
407 /* WinNT support GetCompressedFileSize to determine allocate size */
409 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
410 "GetCompressedFileSizeA");
411 if (get_compressed) {
413 low = get_compressed(filename, &high);
414 if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
415 return (((int64_t) high) << 32) + low;
419 if (_stati64(filename, &st) < 0) {
425 static int raw_create(const char *filename, QEMUOptionParameter *options,
429 int64_t total_size = 0;
431 /* Read out options */
432 while (options && options->name) {
433 if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
434 total_size = options->value.n / 512;
439 fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
444 ftruncate(fd, total_size * 512);
449 static QEMUOptionParameter raw_create_options[] = {
451 .name = BLOCK_OPT_SIZE,
453 .help = "Virtual disk size"
458 static BlockDriver bdrv_file = {
459 .format_name = "file",
460 .protocol_name = "file",
461 .instance_size = sizeof(BDRVRawState),
462 .bdrv_needs_filename = true,
463 .bdrv_file_open = raw_open,
464 .bdrv_close = raw_close,
465 .bdrv_create = raw_create,
466 .bdrv_has_zero_init = bdrv_has_zero_init_1,
468 .bdrv_aio_readv = raw_aio_readv,
469 .bdrv_aio_writev = raw_aio_writev,
470 .bdrv_aio_flush = raw_aio_flush,
472 .bdrv_truncate = raw_truncate,
473 .bdrv_getlength = raw_getlength,
474 .bdrv_get_allocated_file_size
475 = raw_get_allocated_file_size,
477 .create_options = raw_create_options,
480 /***********************************************/
483 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
485 char drives[256], *pdrv = drives;
488 memset(drives, 0, sizeof(drives));
489 GetLogicalDriveStrings(sizeof(drives), drives);
490 while(pdrv[0] != '\0') {
491 type = GetDriveType(pdrv);
494 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
498 pdrv += lstrlen(pdrv) + 1;
503 static int find_device_type(BlockDriverState *bs, const char *filename)
505 BDRVRawState *s = bs->opaque;
509 if (strstart(filename, "\\\\.\\", &p) ||
510 strstart(filename, "//./", &p)) {
511 if (stristart(p, "PhysicalDrive", NULL))
512 return FTYPE_HARDDISK;
513 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
514 type = GetDriveType(s->drive_path);
516 case DRIVE_REMOVABLE:
518 return FTYPE_HARDDISK;
529 static int hdev_probe_device(const char *filename)
531 if (strstart(filename, "/dev/cdrom", NULL))
533 if (is_windows_drive(filename))
538 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
541 BDRVRawState *s = bs->opaque;
542 int access_flags, create_flags;
545 char device_name[64];
547 Error *local_err = NULL;
548 const char *filename;
550 QemuOpts *opts = qemu_opts_create_nofail(&raw_runtime_opts);
551 qemu_opts_absorb_qdict(opts, options, &local_err);
552 if (error_is_set(&local_err)) {
553 qerror_report_err(local_err);
554 error_free(local_err);
559 filename = qemu_opt_get(opts, "filename");
561 if (strstart(filename, "/dev/cdrom", NULL)) {
562 if (find_cdrom(device_name, sizeof(device_name)) < 0) {
566 filename = device_name;
568 /* transform drive letters into device name */
569 if (((filename[0] >= 'a' && filename[0] <= 'z') ||
570 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
571 filename[1] == ':' && filename[2] == '\0') {
572 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
573 filename = device_name;
576 s->type = find_device_type(bs, filename);
578 raw_parse_flags(flags, &access_flags, &overlapped);
580 create_flags = OPEN_EXISTING;
582 s->hfile = CreateFile(filename, access_flags,
583 FILE_SHARE_READ, NULL,
584 create_flags, overlapped, NULL);
585 if (s->hfile == INVALID_HANDLE_VALUE) {
586 int err = GetLastError();
588 if (err == ERROR_ACCESS_DENIED) {
601 static BlockDriver bdrv_host_device = {
602 .format_name = "host_device",
603 .protocol_name = "host_device",
604 .instance_size = sizeof(BDRVRawState),
605 .bdrv_needs_filename = true,
606 .bdrv_probe_device = hdev_probe_device,
607 .bdrv_file_open = hdev_open,
608 .bdrv_close = raw_close,
610 .bdrv_aio_readv = raw_aio_readv,
611 .bdrv_aio_writev = raw_aio_writev,
612 .bdrv_aio_flush = raw_aio_flush,
614 .bdrv_getlength = raw_getlength,
615 .bdrv_get_allocated_file_size
616 = raw_get_allocated_file_size,
619 static void bdrv_file_init(void)
621 bdrv_register(&bdrv_file);
622 bdrv_register(&bdrv_host_device);
625 block_init(bdrv_file_init);