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 error_propagate(errp, local_err);
259 filename = qemu_opt_get(opts, "filename");
261 raw_parse_flags(flags, &access_flags, &overlapped);
263 if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) {
264 aio = win32_aio_init();
266 error_setg(errp, "Could not initialize AIO");
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) {
283 error_setg_errno(errp, -ret, "Could not open file");
287 if (flags & BDRV_O_NATIVE_AIO) {
288 ret = win32_aio_attach(aio, s->hfile);
290 CloseHandle(s->hfile);
291 error_setg_errno(errp, -ret, "Could not enable AIO");
303 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
304 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
305 BlockDriverCompletionFunc *cb, void *opaque)
307 BDRVRawState *s = bs->opaque;
309 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
310 nb_sectors, cb, opaque, QEMU_AIO_READ);
312 return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
313 cb, opaque, QEMU_AIO_READ);
317 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
318 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
319 BlockDriverCompletionFunc *cb, void *opaque)
321 BDRVRawState *s = bs->opaque;
323 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
324 nb_sectors, cb, opaque, QEMU_AIO_WRITE);
326 return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
327 cb, opaque, QEMU_AIO_WRITE);
331 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
332 BlockDriverCompletionFunc *cb, void *opaque)
334 BDRVRawState *s = bs->opaque;
335 return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
338 static void raw_close(BlockDriverState *bs)
340 BDRVRawState *s = bs->opaque;
341 CloseHandle(s->hfile);
344 static int raw_truncate(BlockDriverState *bs, int64_t offset)
346 BDRVRawState *s = bs->opaque;
354 * An error has occurred if the return value is INVALID_SET_FILE_POINTER
355 * and GetLastError doesn't return NO_ERROR.
357 dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
358 if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
359 fprintf(stderr, "SetFilePointer error: %lu\n", GetLastError());
362 if (SetEndOfFile(s->hfile) == 0) {
363 fprintf(stderr, "SetEndOfFile error: %lu\n", GetLastError());
369 static int64_t raw_getlength(BlockDriverState *bs)
371 BDRVRawState *s = bs->opaque;
373 ULARGE_INTEGER available, total, total_free;
380 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
381 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
385 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
387 l.QuadPart = total.QuadPart;
390 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
391 NULL, 0, &dg, sizeof(dg), &count, NULL);
402 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
404 typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
406 get_compressed_t get_compressed;
408 const char *filename = bs->filename;
409 /* WinNT support GetCompressedFileSize to determine allocate size */
411 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
412 "GetCompressedFileSizeA");
413 if (get_compressed) {
415 low = get_compressed(filename, &high);
416 if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
417 return (((int64_t) high) << 32) + low;
421 if (_stati64(filename, &st) < 0) {
427 static int raw_create(const char *filename, QEMUOptionParameter *options,
431 int64_t total_size = 0;
433 /* Read out options */
434 while (options && options->name) {
435 if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
436 total_size = options->value.n / 512;
441 fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
444 error_setg_errno(errp, errno, "Could not create file");
448 ftruncate(fd, total_size * 512);
453 static QEMUOptionParameter raw_create_options[] = {
455 .name = BLOCK_OPT_SIZE,
457 .help = "Virtual disk size"
462 static BlockDriver bdrv_file = {
463 .format_name = "file",
464 .protocol_name = "file",
465 .instance_size = sizeof(BDRVRawState),
466 .bdrv_needs_filename = true,
467 .bdrv_file_open = raw_open,
468 .bdrv_close = raw_close,
469 .bdrv_create = raw_create,
470 .bdrv_has_zero_init = bdrv_has_zero_init_1,
472 .bdrv_aio_readv = raw_aio_readv,
473 .bdrv_aio_writev = raw_aio_writev,
474 .bdrv_aio_flush = raw_aio_flush,
476 .bdrv_truncate = raw_truncate,
477 .bdrv_getlength = raw_getlength,
478 .bdrv_get_allocated_file_size
479 = raw_get_allocated_file_size,
481 .create_options = raw_create_options,
484 /***********************************************/
487 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
489 char drives[256], *pdrv = drives;
492 memset(drives, 0, sizeof(drives));
493 GetLogicalDriveStrings(sizeof(drives), drives);
494 while(pdrv[0] != '\0') {
495 type = GetDriveType(pdrv);
498 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
502 pdrv += lstrlen(pdrv) + 1;
507 static int find_device_type(BlockDriverState *bs, const char *filename)
509 BDRVRawState *s = bs->opaque;
513 if (strstart(filename, "\\\\.\\", &p) ||
514 strstart(filename, "//./", &p)) {
515 if (stristart(p, "PhysicalDrive", NULL))
516 return FTYPE_HARDDISK;
517 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
518 type = GetDriveType(s->drive_path);
520 case DRIVE_REMOVABLE:
522 return FTYPE_HARDDISK;
533 static int hdev_probe_device(const char *filename)
535 if (strstart(filename, "/dev/cdrom", NULL))
537 if (is_windows_drive(filename))
542 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
545 BDRVRawState *s = bs->opaque;
546 int access_flags, create_flags;
549 char device_name[64];
551 Error *local_err = NULL;
552 const char *filename;
554 QemuOpts *opts = qemu_opts_create_nofail(&raw_runtime_opts);
555 qemu_opts_absorb_qdict(opts, options, &local_err);
556 if (error_is_set(&local_err)) {
557 error_propagate(errp, local_err);
562 filename = qemu_opt_get(opts, "filename");
564 if (strstart(filename, "/dev/cdrom", NULL)) {
565 if (find_cdrom(device_name, sizeof(device_name)) < 0) {
566 error_setg(errp, "Could not open CD-ROM drive");
570 filename = device_name;
572 /* transform drive letters into device name */
573 if (((filename[0] >= 'a' && filename[0] <= 'z') ||
574 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
575 filename[1] == ':' && filename[2] == '\0') {
576 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
577 filename = device_name;
580 s->type = find_device_type(bs, filename);
582 raw_parse_flags(flags, &access_flags, &overlapped);
584 create_flags = OPEN_EXISTING;
586 s->hfile = CreateFile(filename, access_flags,
587 FILE_SHARE_READ, NULL,
588 create_flags, overlapped, NULL);
589 if (s->hfile == INVALID_HANDLE_VALUE) {
590 int err = GetLastError();
592 if (err == ERROR_ACCESS_DENIED) {
593 error_setg_errno(errp, EACCES, "Could not open device");
596 error_setg(errp, "Could not open device");
607 static BlockDriver bdrv_host_device = {
608 .format_name = "host_device",
609 .protocol_name = "host_device",
610 .instance_size = sizeof(BDRVRawState),
611 .bdrv_needs_filename = true,
612 .bdrv_probe_device = hdev_probe_device,
613 .bdrv_file_open = hdev_open,
614 .bdrv_close = raw_close,
616 .bdrv_aio_readv = raw_aio_readv,
617 .bdrv_aio_writev = raw_aio_writev,
618 .bdrv_aio_flush = raw_aio_flush,
620 .bdrv_getlength = raw_getlength,
621 .bdrv_get_allocated_file_size
622 = raw_get_allocated_file_size,
625 static void bdrv_file_init(void)
627 bdrv_register(&bdrv_file);
628 bdrv_register(&bdrv_host_device);
631 block_init(bdrv_file_init);