| /* |
| * Block driver for RAW files (win32) |
| * |
| * Copyright (c) 2006 Fabrice Bellard |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| #include "qemu-common.h" |
| #include "qemu-timer.h" |
| #include "block_int.h" |
| #include "module.h" |
| #include "raw-aio.h" |
| #include "trace.h" |
| #include "thread-pool.h" |
| #include "iov.h" |
| #include <windows.h> |
| #include <winioctl.h> |
| |
| #define FTYPE_FILE 0 |
| #define FTYPE_CD 1 |
| #define FTYPE_HARDDISK 2 |
| |
| static QEMUWin32AIOState *aio; |
| |
| typedef struct RawWin32AIOData { |
| BlockDriverState *bs; |
| HANDLE hfile; |
| struct iovec *aio_iov; |
| int aio_niov; |
| size_t aio_nbytes; |
| off64_t aio_offset; |
| int aio_type; |
| } RawWin32AIOData; |
| |
| typedef struct BDRVRawState { |
| HANDLE hfile; |
| int type; |
| char drive_path[16]; /* format: "d:\" */ |
| QEMUWin32AIOState *aio; |
| } BDRVRawState; |
| |
| /* |
| * Read/writes the data to/from a given linear buffer. |
| * |
| * Returns the number of bytes handles or -errno in case of an error. Short |
| * reads are only returned if the end of the file is reached. |
| */ |
| static size_t handle_aiocb_rw(RawWin32AIOData *aiocb) |
| { |
| size_t offset = 0; |
| int i; |
| |
| for (i = 0; i < aiocb->aio_niov; i++) { |
| OVERLAPPED ov; |
| DWORD ret, ret_count, len; |
| |
| memset(&ov, 0, sizeof(ov)); |
| ov.Offset = (aiocb->aio_offset + offset); |
| ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32; |
| len = aiocb->aio_iov[i].iov_len; |
| if (aiocb->aio_type & QEMU_AIO_WRITE) { |
| ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base, |
| len, &ret_count, &ov); |
| } else { |
| ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base, |
| len, &ret_count, &ov); |
| } |
| if (!ret) { |
| ret_count = 0; |
| } |
| if (ret_count != len) { |
| break; |
| } |
| offset += len; |
| } |
| |
| return offset; |
| } |
| |
| static int aio_worker(void *arg) |
| { |
| RawWin32AIOData *aiocb = arg; |
| ssize_t ret = 0; |
| size_t count; |
| |
| switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) { |
| case QEMU_AIO_READ: |
| count = handle_aiocb_rw(aiocb); |
| if (count < aiocb->aio_nbytes && aiocb->bs->growable) { |
| /* A short read means that we have reached EOF. Pad the buffer |
| * with zeros for bytes after EOF. */ |
| iov_memset(aiocb->aio_iov, aiocb->aio_niov, count, |
| 0, aiocb->aio_nbytes - count); |
| |
| count = aiocb->aio_nbytes; |
| } |
| if (count == aiocb->aio_nbytes) { |
| ret = 0; |
| } else { |
| ret = -EINVAL; |
| } |
| break; |
| case QEMU_AIO_WRITE: |
| count = handle_aiocb_rw(aiocb); |
| if (count == aiocb->aio_nbytes) { |
| count = 0; |
| } else { |
| count = -EINVAL; |
| } |
| break; |
| case QEMU_AIO_FLUSH: |
| if (!FlushFileBuffers(aiocb->hfile)) { |
| return -EIO; |
| } |
| break; |
| default: |
| fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type); |
| ret = -EINVAL; |
| break; |
| } |
| |
| g_slice_free(RawWin32AIOData, aiocb); |
| return ret; |
| } |
| |
| static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile, |
| int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
| BlockDriverCompletionFunc *cb, void *opaque, int type) |
| { |
| RawWin32AIOData *acb = g_slice_new(RawWin32AIOData); |
| |
| acb->bs = bs; |
| acb->hfile = hfile; |
| acb->aio_type = type; |
| |
| if (qiov) { |
| acb->aio_iov = qiov->iov; |
| acb->aio_niov = qiov->niov; |
| } |
| acb->aio_nbytes = nb_sectors * 512; |
| acb->aio_offset = sector_num * 512; |
| |
| trace_paio_submit(acb, opaque, sector_num, nb_sectors, type); |
| return thread_pool_submit_aio(aio_worker, acb, cb, opaque); |
| } |
| |
| int qemu_ftruncate64(int fd, int64_t length) |
| { |
| LARGE_INTEGER li; |
| DWORD dw; |
| LONG high; |
| HANDLE h; |
| BOOL res; |
| |
| if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0) |
| return -1; |
| |
| h = (HANDLE)_get_osfhandle(fd); |
| |
| /* get current position, ftruncate do not change position */ |
| li.HighPart = 0; |
| li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT); |
| if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) { |
| return -1; |
| } |
| |
| high = length >> 32; |
| dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN); |
| if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) { |
| return -1; |
| } |
| res = SetEndOfFile(h); |
| |
| /* back to old position */ |
| SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN); |
| return res ? 0 : -1; |
| } |
| |
| static int set_sparse(int fd) |
| { |
| DWORD returned; |
| return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE, |
| NULL, 0, NULL, 0, &returned, NULL); |
| } |
| |
| static void raw_parse_flags(int flags, int *access_flags, DWORD *overlapped) |
| { |
| assert(access_flags != NULL); |
| assert(overlapped != NULL); |
| |
| if (flags & BDRV_O_RDWR) { |
| *access_flags = GENERIC_READ | GENERIC_WRITE; |
| } else { |
| *access_flags = GENERIC_READ; |
| } |
| |
| *overlapped = FILE_ATTRIBUTE_NORMAL; |
| if (flags & BDRV_O_NATIVE_AIO) { |
| *overlapped |= FILE_FLAG_OVERLAPPED; |
| } |
| if (flags & BDRV_O_NOCACHE) { |
| *overlapped |= FILE_FLAG_NO_BUFFERING; |
| } |
| } |
| |
| static int raw_open(BlockDriverState *bs, const char *filename, int flags) |
| { |
| BDRVRawState *s = bs->opaque; |
| int access_flags; |
| DWORD overlapped; |
| |
| s->type = FTYPE_FILE; |
| |
| raw_parse_flags(flags, &access_flags, &overlapped); |
| |
| if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) { |
| aio = win32_aio_init(); |
| if (aio == NULL) { |
| return -EINVAL; |
| } |
| } |
| |
| s->hfile = CreateFile(filename, access_flags, |
| FILE_SHARE_READ, NULL, |
| OPEN_EXISTING, overlapped, NULL); |
| if (s->hfile == INVALID_HANDLE_VALUE) { |
| int err = GetLastError(); |
| |
| if (err == ERROR_ACCESS_DENIED) |
| return -EACCES; |
| return -EINVAL; |
| } |
| |
| if (flags & BDRV_O_NATIVE_AIO) { |
| int ret = win32_aio_attach(aio, s->hfile); |
| if (ret < 0) { |
| CloseHandle(s->hfile); |
| return ret; |
| } |
| s->aio = aio; |
| } |
| return 0; |
| } |
| |
| static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs, |
| int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
| BlockDriverCompletionFunc *cb, void *opaque) |
| { |
| BDRVRawState *s = bs->opaque; |
| if (s->aio) { |
| return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov, |
| nb_sectors, cb, opaque, QEMU_AIO_READ); |
| } else { |
| return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors, |
| cb, opaque, QEMU_AIO_READ); |
| } |
| } |
| |
| static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs, |
| int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, |
| BlockDriverCompletionFunc *cb, void *opaque) |
| { |
| BDRVRawState *s = bs->opaque; |
| if (s->aio) { |
| return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov, |
| nb_sectors, cb, opaque, QEMU_AIO_WRITE); |
| } else { |
| return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors, |
| cb, opaque, QEMU_AIO_WRITE); |
| } |
| } |
| |
| static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs, |
| BlockDriverCompletionFunc *cb, void *opaque) |
| { |
| BDRVRawState *s = bs->opaque; |
| return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH); |
| } |
| |
| static void raw_close(BlockDriverState *bs) |
| { |
| BDRVRawState *s = bs->opaque; |
| CloseHandle(s->hfile); |
| } |
| |
| static int raw_truncate(BlockDriverState *bs, int64_t offset) |
| { |
| BDRVRawState *s = bs->opaque; |
| LONG low, high; |
| |
| low = offset; |
| high = offset >> 32; |
| if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN)) |
| return -EIO; |
| if (!SetEndOfFile(s->hfile)) |
| return -EIO; |
| return 0; |
| } |
| |
| static int64_t raw_getlength(BlockDriverState *bs) |
| { |
| BDRVRawState *s = bs->opaque; |
| LARGE_INTEGER l; |
| ULARGE_INTEGER available, total, total_free; |
| DISK_GEOMETRY_EX dg; |
| DWORD count; |
| BOOL status; |
| |
| switch(s->type) { |
| case FTYPE_FILE: |
| l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart); |
| if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR) |
| return -EIO; |
| break; |
| case FTYPE_CD: |
| if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free)) |
| return -EIO; |
| l.QuadPart = total.QuadPart; |
| break; |
| case FTYPE_HARDDISK: |
| status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX, |
| NULL, 0, &dg, sizeof(dg), &count, NULL); |
| if (status != 0) { |
| l = dg.DiskSize; |
| } |
| break; |
| default: |
| return -EIO; |
| } |
| return l.QuadPart; |
| } |
| |
| static int64_t raw_get_allocated_file_size(BlockDriverState *bs) |
| { |
| typedef DWORD (WINAPI * get_compressed_t)(const char *filename, |
| DWORD * high); |
| get_compressed_t get_compressed; |
| struct _stati64 st; |
| const char *filename = bs->filename; |
| /* WinNT support GetCompressedFileSize to determine allocate size */ |
| get_compressed = |
| (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), |
| "GetCompressedFileSizeA"); |
| if (get_compressed) { |
| DWORD high, low; |
| low = get_compressed(filename, &high); |
| if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) { |
| return (((int64_t) high) << 32) + low; |
| } |
| } |
| |
| if (_stati64(filename, &st) < 0) { |
| return -1; |
| } |
| return st.st_size; |
| } |
| |
| static int raw_create(const char *filename, QEMUOptionParameter *options) |
| { |
| int fd; |
| int64_t total_size = 0; |
| |
| /* Read out options */ |
| while (options && options->name) { |
| if (!strcmp(options->name, BLOCK_OPT_SIZE)) { |
| total_size = options->value.n / 512; |
| } |
| options++; |
| } |
| |
| fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, |
| 0644); |
| if (fd < 0) |
| return -EIO; |
| set_sparse(fd); |
| ftruncate(fd, total_size * 512); |
| qemu_close(fd); |
| return 0; |
| } |
| |
| static QEMUOptionParameter raw_create_options[] = { |
| { |
| .name = BLOCK_OPT_SIZE, |
| .type = OPT_SIZE, |
| .help = "Virtual disk size" |
| }, |
| { NULL } |
| }; |
| |
| static BlockDriver bdrv_file = { |
| .format_name = "file", |
| .protocol_name = "file", |
| .instance_size = sizeof(BDRVRawState), |
| .bdrv_file_open = raw_open, |
| .bdrv_close = raw_close, |
| .bdrv_create = raw_create, |
| |
| .bdrv_aio_readv = raw_aio_readv, |
| .bdrv_aio_writev = raw_aio_writev, |
| .bdrv_aio_flush = raw_aio_flush, |
| |
| .bdrv_truncate = raw_truncate, |
| .bdrv_getlength = raw_getlength, |
| .bdrv_get_allocated_file_size |
| = raw_get_allocated_file_size, |
| |
| .create_options = raw_create_options, |
| }; |
| |
| /***********************************************/ |
| /* host device */ |
| |
| static int find_cdrom(char *cdrom_name, int cdrom_name_size) |
| { |
| char drives[256], *pdrv = drives; |
| UINT type; |
| |
| memset(drives, 0, sizeof(drives)); |
| GetLogicalDriveStrings(sizeof(drives), drives); |
| while(pdrv[0] != '\0') { |
| type = GetDriveType(pdrv); |
| switch(type) { |
| case DRIVE_CDROM: |
| snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]); |
| return 0; |
| break; |
| } |
| pdrv += lstrlen(pdrv) + 1; |
| } |
| return -1; |
| } |
| |
| static int find_device_type(BlockDriverState *bs, const char *filename) |
| { |
| BDRVRawState *s = bs->opaque; |
| UINT type; |
| const char *p; |
| |
| if (strstart(filename, "\\\\.\\", &p) || |
| strstart(filename, "//./", &p)) { |
| if (stristart(p, "PhysicalDrive", NULL)) |
| return FTYPE_HARDDISK; |
| snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]); |
| type = GetDriveType(s->drive_path); |
| switch (type) { |
| case DRIVE_REMOVABLE: |
| case DRIVE_FIXED: |
| return FTYPE_HARDDISK; |
| case DRIVE_CDROM: |
| return FTYPE_CD; |
| default: |
| return FTYPE_FILE; |
| } |
| } else { |
| return FTYPE_FILE; |
| } |
| } |
| |
| static int hdev_probe_device(const char *filename) |
| { |
| if (strstart(filename, "/dev/cdrom", NULL)) |
| return 100; |
| if (is_windows_drive(filename)) |
| return 100; |
| return 0; |
| } |
| |
| static int hdev_open(BlockDriverState *bs, const char *filename, int flags) |
| { |
| BDRVRawState *s = bs->opaque; |
| int access_flags, create_flags; |
| DWORD overlapped; |
| char device_name[64]; |
| |
| if (strstart(filename, "/dev/cdrom", NULL)) { |
| if (find_cdrom(device_name, sizeof(device_name)) < 0) |
| return -ENOENT; |
| filename = device_name; |
| } else { |
| /* transform drive letters into device name */ |
| if (((filename[0] >= 'a' && filename[0] <= 'z') || |
| (filename[0] >= 'A' && filename[0] <= 'Z')) && |
| filename[1] == ':' && filename[2] == '\0') { |
| snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]); |
| filename = device_name; |
| } |
| } |
| s->type = find_device_type(bs, filename); |
| |
| raw_parse_flags(flags, &access_flags, &overlapped); |
| |
| create_flags = OPEN_EXISTING; |
| |
| s->hfile = CreateFile(filename, access_flags, |
| FILE_SHARE_READ, NULL, |
| create_flags, overlapped, NULL); |
| if (s->hfile == INVALID_HANDLE_VALUE) { |
| int err = GetLastError(); |
| |
| if (err == ERROR_ACCESS_DENIED) |
| return -EACCES; |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int hdev_has_zero_init(BlockDriverState *bs) |
| { |
| return 0; |
| } |
| |
| static BlockDriver bdrv_host_device = { |
| .format_name = "host_device", |
| .protocol_name = "host_device", |
| .instance_size = sizeof(BDRVRawState), |
| .bdrv_probe_device = hdev_probe_device, |
| .bdrv_file_open = hdev_open, |
| .bdrv_close = raw_close, |
| .bdrv_has_zero_init = hdev_has_zero_init, |
| |
| .bdrv_aio_readv = raw_aio_readv, |
| .bdrv_aio_writev = raw_aio_writev, |
| .bdrv_aio_flush = raw_aio_flush, |
| |
| .bdrv_getlength = raw_getlength, |
| .bdrv_get_allocated_file_size |
| = raw_get_allocated_file_size, |
| }; |
| |
| static void bdrv_file_init(void) |
| { |
| bdrv_register(&bdrv_file); |
| bdrv_register(&bdrv_host_device); |
| } |
| |
| block_init(bdrv_file_init); |