PPC: Fix rldcl
[qemu/agraf.git] / block / raw-win32.c
blob7c03b6df52e1bcf820cf4599774b61a6612aefae
1 /*
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
22 * THE SOFTWARE.
24 #include "qemu-common.h"
25 #include "qemu/timer.h"
26 #include "block/block_int.h"
27 #include "qemu/module.h"
28 #include "raw-aio.h"
29 #include "trace.h"
30 #include "block/thread-pool.h"
31 #include "qemu/iov.h"
32 #include <windows.h>
33 #include <winioctl.h>
35 #define FTYPE_FILE 0
36 #define FTYPE_CD 1
37 #define FTYPE_HARDDISK 2
39 static QEMUWin32AIOState *aio;
41 typedef struct RawWin32AIOData {
42 BlockDriverState *bs;
43 HANDLE hfile;
44 struct iovec *aio_iov;
45 int aio_niov;
46 size_t aio_nbytes;
47 off64_t aio_offset;
48 int aio_type;
49 } RawWin32AIOData;
51 typedef struct BDRVRawState {
52 HANDLE hfile;
53 int type;
54 char drive_path[16]; /* format: "d:\" */
55 QEMUWin32AIOState *aio;
56 } BDRVRawState;
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)
66 size_t offset = 0;
67 int i;
69 for (i = 0; i < aiocb->aio_niov; i++) {
70 OVERLAPPED ov;
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);
80 } else {
81 ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
82 len, &ret_count, &ov);
84 if (!ret) {
85 ret_count = 0;
87 if (ret_count != len) {
88 break;
90 offset += len;
93 return offset;
96 static int aio_worker(void *arg)
98 RawWin32AIOData *aiocb = arg;
99 ssize_t ret = 0;
100 size_t count;
102 switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
103 case QEMU_AIO_READ:
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) {
114 ret = 0;
115 } else {
116 ret = -EINVAL;
118 break;
119 case QEMU_AIO_WRITE:
120 count = handle_aiocb_rw(aiocb);
121 if (count == aiocb->aio_nbytes) {
122 count = 0;
123 } else {
124 count = -EINVAL;
126 break;
127 case QEMU_AIO_FLUSH:
128 if (!FlushFileBuffers(aiocb->hfile)) {
129 return -EIO;
131 break;
132 default:
133 fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
134 ret = -EINVAL;
135 break;
138 g_slice_free(RawWin32AIOData, aiocb);
139 return ret;
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);
147 ThreadPool *pool;
149 acb->bs = bs;
150 acb->hfile = hfile;
151 acb->aio_type = type;
153 if (qiov) {
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)
167 LARGE_INTEGER li;
168 DWORD dw;
169 LONG high;
170 HANDLE h;
171 BOOL res;
173 if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
174 return -1;
176 h = (HANDLE)_get_osfhandle(fd);
178 /* get current position, ftruncate do not change position */
179 li.HighPart = 0;
180 li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
181 if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
182 return -1;
185 high = length >> 32;
186 dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
187 if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
188 return -1;
190 res = SetEndOfFile(h);
192 /* back to old position */
193 SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
194 return res ? 0 : -1;
197 static int set_sparse(int fd)
199 DWORD returned;
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;
211 } else {
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 = {
225 .name = "raw",
226 .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
227 .desc = {
229 .name = "filename",
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;
240 int access_flags;
241 DWORD overlapped;
242 QemuOpts *opts;
243 Error *local_err = NULL;
244 const char *filename;
245 int ret;
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);
254 ret = -EINVAL;
255 goto fail;
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();
264 if (aio == NULL) {
265 ret = -EINVAL;
266 goto fail;
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) {
277 ret = -EACCES;
278 } else {
279 ret = -EINVAL;
281 goto fail;
284 if (flags & BDRV_O_NATIVE_AIO) {
285 ret = win32_aio_attach(aio, s->hfile);
286 if (ret < 0) {
287 CloseHandle(s->hfile);
288 goto fail;
290 s->aio = aio;
293 ret = 0;
294 fail:
295 qemu_opts_del(opts);
296 return ret;
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;
304 if (s->aio) {
305 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
306 nb_sectors, cb, opaque, QEMU_AIO_READ);
307 } else {
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;
318 if (s->aio) {
319 return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
320 nb_sectors, cb, opaque, QEMU_AIO_WRITE);
321 } else {
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;
343 LONG low, high;
344 DWORD dwPtrLow;
346 low = offset;
347 high = offset >> 32;
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());
356 return -EIO;
358 if (SetEndOfFile(s->hfile) == 0) {
359 fprintf(stderr, "SetEndOfFile error: %lu\n", GetLastError());
360 return -EIO;
362 return 0;
365 static int64_t raw_getlength(BlockDriverState *bs)
367 BDRVRawState *s = bs->opaque;
368 LARGE_INTEGER l;
369 ULARGE_INTEGER available, total, total_free;
370 DISK_GEOMETRY_EX dg;
371 DWORD count;
372 BOOL status;
374 switch(s->type) {
375 case FTYPE_FILE:
376 l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
377 if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
378 return -EIO;
379 break;
380 case FTYPE_CD:
381 if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
382 return -EIO;
383 l.QuadPart = total.QuadPart;
384 break;
385 case FTYPE_HARDDISK:
386 status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
387 NULL, 0, &dg, sizeof(dg), &count, NULL);
388 if (status != 0) {
389 l = dg.DiskSize;
391 break;
392 default:
393 return -EIO;
395 return l.QuadPart;
398 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
400 typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
401 DWORD * high);
402 get_compressed_t get_compressed;
403 struct _stati64 st;
404 const char *filename = bs->filename;
405 /* WinNT support GetCompressedFileSize to determine allocate size */
406 get_compressed =
407 (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
408 "GetCompressedFileSizeA");
409 if (get_compressed) {
410 DWORD high, low;
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) {
418 return -1;
420 return st.st_size;
423 static int raw_create(const char *filename, QEMUOptionParameter *options)
425 int fd;
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;
433 options++;
436 fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
437 0644);
438 if (fd < 0)
439 return -EIO;
440 set_sparse(fd);
441 ftruncate(fd, total_size * 512);
442 qemu_close(fd);
443 return 0;
446 static QEMUOptionParameter raw_create_options[] = {
448 .name = BLOCK_OPT_SIZE,
449 .type = OPT_SIZE,
450 .help = "Virtual disk size"
452 { NULL }
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,
463 .bdrv_aio_readv = raw_aio_readv,
464 .bdrv_aio_writev = raw_aio_writev,
465 .bdrv_aio_flush = raw_aio_flush,
467 .bdrv_truncate = raw_truncate,
468 .bdrv_getlength = raw_getlength,
469 .bdrv_get_allocated_file_size
470 = raw_get_allocated_file_size,
472 .create_options = raw_create_options,
475 /***********************************************/
476 /* host device */
478 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
480 char drives[256], *pdrv = drives;
481 UINT type;
483 memset(drives, 0, sizeof(drives));
484 GetLogicalDriveStrings(sizeof(drives), drives);
485 while(pdrv[0] != '\0') {
486 type = GetDriveType(pdrv);
487 switch(type) {
488 case DRIVE_CDROM:
489 snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
490 return 0;
491 break;
493 pdrv += lstrlen(pdrv) + 1;
495 return -1;
498 static int find_device_type(BlockDriverState *bs, const char *filename)
500 BDRVRawState *s = bs->opaque;
501 UINT type;
502 const char *p;
504 if (strstart(filename, "\\\\.\\", &p) ||
505 strstart(filename, "//./", &p)) {
506 if (stristart(p, "PhysicalDrive", NULL))
507 return FTYPE_HARDDISK;
508 snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
509 type = GetDriveType(s->drive_path);
510 switch (type) {
511 case DRIVE_REMOVABLE:
512 case DRIVE_FIXED:
513 return FTYPE_HARDDISK;
514 case DRIVE_CDROM:
515 return FTYPE_CD;
516 default:
517 return FTYPE_FILE;
519 } else {
520 return FTYPE_FILE;
524 static int hdev_probe_device(const char *filename)
526 if (strstart(filename, "/dev/cdrom", NULL))
527 return 100;
528 if (is_windows_drive(filename))
529 return 100;
530 return 0;
533 static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
535 BDRVRawState *s = bs->opaque;
536 int access_flags, create_flags;
537 DWORD overlapped;
538 char device_name[64];
539 const char *filename = qdict_get_str(options, "filename");
541 if (strstart(filename, "/dev/cdrom", NULL)) {
542 if (find_cdrom(device_name, sizeof(device_name)) < 0)
543 return -ENOENT;
544 filename = device_name;
545 } else {
546 /* transform drive letters into device name */
547 if (((filename[0] >= 'a' && filename[0] <= 'z') ||
548 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
549 filename[1] == ':' && filename[2] == '\0') {
550 snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
551 filename = device_name;
554 s->type = find_device_type(bs, filename);
556 raw_parse_flags(flags, &access_flags, &overlapped);
558 create_flags = OPEN_EXISTING;
560 s->hfile = CreateFile(filename, access_flags,
561 FILE_SHARE_READ, NULL,
562 create_flags, overlapped, NULL);
563 if (s->hfile == INVALID_HANDLE_VALUE) {
564 int err = GetLastError();
566 if (err == ERROR_ACCESS_DENIED)
567 return -EACCES;
568 return -1;
570 return 0;
573 static int hdev_has_zero_init(BlockDriverState *bs)
575 return 0;
578 static BlockDriver bdrv_host_device = {
579 .format_name = "host_device",
580 .protocol_name = "host_device",
581 .instance_size = sizeof(BDRVRawState),
582 .bdrv_probe_device = hdev_probe_device,
583 .bdrv_file_open = hdev_open,
584 .bdrv_close = raw_close,
585 .bdrv_has_zero_init = hdev_has_zero_init,
587 .bdrv_aio_readv = raw_aio_readv,
588 .bdrv_aio_writev = raw_aio_writev,
589 .bdrv_aio_flush = raw_aio_flush,
591 .bdrv_getlength = raw_getlength,
592 .bdrv_get_allocated_file_size
593 = raw_get_allocated_file_size,
596 static void bdrv_file_init(void)
598 bdrv_register(&bdrv_file);
599 bdrv_register(&bdrv_host_device);
602 block_init(bdrv_file_init);