/* * 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" #ifndef QEMU_IMG #include "qemu-timer.h" #include "exec-all.h" #endif #include "block_int.h" #include <assert.h> #include <winioctl.h> #define FTYPE_FILE 0 #define FTYPE_CD 1 #define FTYPE_HARDDISK 2 typedef struct BDRVRawState { HANDLE hfile; int type; char drive_path[16]; /* format: "d:\" */ } BDRVRawState; typedef struct RawAIOCB { BlockDriverAIOCB common; HANDLE hEvent; OVERLAPPED ov; int count; } RawAIOCB; int qemu_ftruncate64(int fd, int64_t length) { LARGE_INTEGER li; 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 == 0xffffffffUL && GetLastError() != NO_ERROR) return -1; high = length >> 32; if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN)) 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 int raw_open(BlockDriverState *bs, const char *filename, int flags) { BDRVRawState *s = bs->opaque; int access_flags, create_flags; DWORD overlapped; s->type = FTYPE_FILE; if ((flags & BDRV_O_ACCESS) == O_RDWR) { access_flags = GENERIC_READ | GENERIC_WRITE; } else { access_flags = GENERIC_READ; } if (flags & BDRV_O_CREAT) { create_flags = CREATE_ALWAYS; } else { create_flags = OPEN_EXISTING; } #ifdef QEMU_IMG overlapped = FILE_ATTRIBUTE_NORMAL; #else overlapped = FILE_FLAG_OVERLAPPED; #endif if (flags & BDRV_O_DIRECT) overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH; 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 raw_pread(BlockDriverState *bs, int64_t offset, uint8_t *buf, int count) { BDRVRawState *s = bs->opaque; OVERLAPPED ov; DWORD ret_count; int ret; memset(&ov, 0, sizeof(ov)); ov.Offset = offset; ov.OffsetHigh = offset >> 32; ret = ReadFile(s->hfile, buf, count, &ret_count, &ov); if (!ret) { ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE); if (!ret) return -EIO; else return ret_count; } return ret_count; } static int raw_pwrite(BlockDriverState *bs, int64_t offset, const uint8_t *buf, int count) { BDRVRawState *s = bs->opaque; OVERLAPPED ov; DWORD ret_count; int ret; memset(&ov, 0, sizeof(ov)); ov.Offset = offset; ov.OffsetHigh = offset >> 32; ret = WriteFile(s->hfile, buf, count, &ret_count, &ov); if (!ret) { ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE); if (!ret) return -EIO; else return ret_count; } return ret_count; } #if 0 #ifndef QEMU_IMG static void raw_aio_cb(void *opaque) { RawAIOCB *acb = opaque; BlockDriverState *bs = acb->common.bs; BDRVRawState *s = bs->opaque; DWORD ret_count; int ret; ret = GetOverlappedResult(s->hfile, &acb->ov, &ret_count, TRUE); if (!ret || ret_count != acb->count) { acb->common.cb(acb->common.opaque, -EIO); } else { acb->common.cb(acb->common.opaque, 0); } } #endif static RawAIOCB *raw_aio_setup(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { RawAIOCB *acb; int64_t offset; acb = qemu_aio_get(bs, cb, opaque); if (acb->hEvent) { acb->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); if (!acb->hEvent) { qemu_aio_release(acb); return NULL; } } memset(&acb->ov, 0, sizeof(acb->ov)); offset = sector_num * 512; acb->ov.Offset = offset; acb->ov.OffsetHigh = offset >> 32; acb->ov.hEvent = acb->hEvent; acb->count = nb_sectors * 512; #ifndef QEMU_IMG qemu_add_wait_object(acb->ov.hEvent, raw_aio_cb, acb); #endif return acb; } static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { BDRVRawState *s = bs->opaque; RawAIOCB *acb; int ret; acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque); if (!acb) return NULL; ret = ReadFile(s->hfile, buf, acb->count, NULL, &acb->ov); if (!ret) { qemu_aio_release(acb); return NULL; } #ifdef QEMU_IMG qemu_aio_release(acb); #endif return (BlockDriverAIOCB *)acb; } static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors, BlockDriverCompletionFunc *cb, void *opaque) { BDRVRawState *s = bs->opaque; RawAIOCB *acb; int ret; acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque); if (!acb) return NULL; ret = WriteFile(s->hfile, buf, acb->count, NULL, &acb->ov); if (!ret) { qemu_aio_release(acb); return NULL; } #ifdef QEMU_IMG qemu_aio_release(acb); #endif return (BlockDriverAIOCB *)acb; } static void raw_aio_cancel(BlockDriverAIOCB *blockacb) { #ifndef QEMU_IMG RawAIOCB *acb = (RawAIOCB *)blockacb; BlockDriverState *bs = acb->common.bs; BDRVRawState *s = bs->opaque; qemu_del_wait_object(acb->ov.hEvent, raw_aio_cb, acb); /* XXX: if more than one async I/O it is not correct */ CancelIo(s->hfile); qemu_aio_release(acb); #endif } #endif /* #if 0 */ static void raw_flush(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; FlushFileBuffers(s->hfile); } 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; DWORD 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, &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 int raw_create(const char *filename, int64_t total_size, const char *backing_file, int flags) { int fd; if (flags || backing_file) return -ENOTSUP; fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644); if (fd < 0) return -EIO; set_sparse(fd); ftruncate(fd, total_size * 512); close(fd); return 0; } void qemu_aio_init(void) { } void qemu_aio_poll(void) { } void qemu_aio_flush(void) { } void qemu_aio_wait_start(void) { } void qemu_aio_wait(void) { #ifndef QEMU_IMG qemu_bh_poll(); #endif } void qemu_aio_wait_end(void) { } BlockDriver bdrv_raw = { "raw", sizeof(BDRVRawState), NULL, /* no probe for protocols */ raw_open, NULL, NULL, raw_close, raw_create, raw_flush, #if 0 .bdrv_aio_read = raw_aio_read, .bdrv_aio_write = raw_aio_write, .bdrv_aio_cancel = raw_aio_cancel, .aiocb_size = sizeof(RawAIOCB); #endif .protocol_name = "file", .bdrv_pread = raw_pread, .bdrv_pwrite = raw_pwrite, .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, }; /***********************************************/ /* 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); if (type == DRIVE_CDROM) return FTYPE_CD; else return FTYPE_FILE; } else { return FTYPE_FILE; } } 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); if ((flags & BDRV_O_ACCESS) == O_RDWR) { access_flags = GENERIC_READ | GENERIC_WRITE; } else { access_flags = GENERIC_READ; } create_flags = OPEN_EXISTING; #ifdef QEMU_IMG overlapped = FILE_ATTRIBUTE_NORMAL; #else overlapped = FILE_FLAG_OVERLAPPED; #endif if (flags & BDRV_O_DIRECT) overlapped |= FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH; 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; } #if 0 /***********************************************/ /* removable device additional commands */ static int raw_is_inserted(BlockDriverState *bs) { return 1; } static int raw_media_changed(BlockDriverState *bs) { return -ENOTSUP; } static int raw_eject(BlockDriverState *bs, int eject_flag) { DWORD ret_count; if (s->type == FTYPE_FILE) return -ENOTSUP; if (eject_flag) { DeviceIoControl(s->hfile, IOCTL_STORAGE_EJECT_MEDIA, NULL, 0, NULL, 0, &lpBytesReturned, NULL); } else { DeviceIoControl(s->hfile, IOCTL_STORAGE_LOAD_MEDIA, NULL, 0, NULL, 0, &lpBytesReturned, NULL); } } static int raw_set_locked(BlockDriverState *bs, int locked) { return -ENOTSUP; } #endif BlockDriver bdrv_host_device = { "host_device", sizeof(BDRVRawState), NULL, /* no probe for protocols */ hdev_open, NULL, NULL, raw_close, NULL, raw_flush, #if 0 .bdrv_aio_read = raw_aio_read, .bdrv_aio_write = raw_aio_write, .bdrv_aio_cancel = raw_aio_cancel, .aiocb_size = sizeof(RawAIOCB); #endif .bdrv_pread = raw_pread, .bdrv_pwrite = raw_pwrite, .bdrv_getlength = raw_getlength, };