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Diffstat (limited to 'include/VBox/vd-ifs.h')
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1 files changed, 1291 insertions, 0 deletions
diff --git a/include/VBox/vd-ifs.h b/include/VBox/vd-ifs.h new file mode 100644 index 00000000..d3167a41 --- /dev/null +++ b/include/VBox/vd-ifs.h @@ -0,0 +1,1291 @@ +/** @file + * VD Container API - interfaces. + */ + +/* + * Copyright (C) 2011 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef ___VBox_VD_Interfaces_h +#define ___VBox_VD_Interfaces_h + +#include <iprt/assert.h> +#include <iprt/string.h> +#include <iprt/mem.h> +#include <iprt/file.h> +#include <iprt/net.h> +#include <iprt/sg.h> +#include <VBox/cdefs.h> +#include <VBox/types.h> +#include <VBox/err.h> + +RT_C_DECLS_BEGIN + +/** Interface header magic. */ +#define VDINTERFACE_MAGIC UINT32_C(0x19701015) + +/** + * Supported interface types. + */ +typedef enum VDINTERFACETYPE +{ + /** First valid interface. */ + VDINTERFACETYPE_FIRST = 0, + /** Interface to pass error message to upper layers. Per-disk. */ + VDINTERFACETYPE_ERROR = VDINTERFACETYPE_FIRST, + /** Interface for I/O operations. Per-image. */ + VDINTERFACETYPE_IO, + /** Interface for progress notification. Per-operation. */ + VDINTERFACETYPE_PROGRESS, + /** Interface for configuration information. Per-image. */ + VDINTERFACETYPE_CONFIG, + /** Interface for TCP network stack. Per-image. */ + VDINTERFACETYPE_TCPNET, + /** Interface for getting parent image state. Per-operation. */ + VDINTERFACETYPE_PARENTSTATE, + /** Interface for synchronizing accesses from several threads. Per-disk. */ + VDINTERFACETYPE_THREADSYNC, + /** Interface for I/O between the generic VBoxHDD code and the backend. Per-image (internal). + * This interface is completely internal and must not be used elsewhere. */ + VDINTERFACETYPE_IOINT, + /** Interface to query the use of block ranges on the disk. Per-operation. */ + VDINTERFACETYPE_QUERYRANGEUSE, + /** invalid interface. */ + VDINTERFACETYPE_INVALID +} VDINTERFACETYPE; + +/** + * Common structure for all interfaces and at the beginning of all types. + */ +typedef struct VDINTERFACE +{ + uint32_t u32Magic; + /** Human readable interface name. */ + const char *pszInterfaceName; + /** Pointer to the next common interface structure. */ + struct VDINTERFACE *pNext; + /** Interface type. */ + VDINTERFACETYPE enmInterface; + /** Size of the interface. */ + size_t cbSize; + /** Opaque user data which is passed on every call. */ + void *pvUser; +} VDINTERFACE; +/** Pointer to a VDINTERFACE. */ +typedef VDINTERFACE *PVDINTERFACE; +/** Pointer to a const VDINTERFACE. */ +typedef const VDINTERFACE *PCVDINTERFACE; + +/** + * Helper functions to handle interface lists. + * + * @note These interface lists are used consistently to pass per-disk, + * per-image and/or per-operation callbacks. Those three purposes are strictly + * separate. See the individual interface declarations for what context they + * apply to. The caller is responsible for ensuring that the lifetime of the + * interface descriptors is appropriate for the category of interface. + */ + +/** + * Get a specific interface from a list of interfaces specified by the type. + * + * @return Pointer to the matching interface or NULL if none was found. + * @param pVDIfs Pointer to the VD interface list. + * @param enmInterface Interface to search for. + */ +DECLINLINE(PVDINTERFACE) VDInterfaceGet(PVDINTERFACE pVDIfs, VDINTERFACETYPE enmInterface) +{ + AssertMsgReturn( enmInterface >= VDINTERFACETYPE_FIRST + && enmInterface < VDINTERFACETYPE_INVALID, + ("enmInterface=%u", enmInterface), NULL); + + while (pVDIfs) + { + AssertMsgBreak(pVDIfs->u32Magic == VDINTERFACE_MAGIC, + ("u32Magic=%#x\n", pVDIfs->u32Magic)); + + if (pVDIfs->enmInterface == enmInterface) + return pVDIfs; + pVDIfs = pVDIfs->pNext; + } + + /* No matching interface was found. */ + return NULL; +} + +/** + * Add an interface to a list of interfaces. + * + * @return VBox status code. + * @param pInterface Pointer to an unitialized common interface structure. + * @param pszName Name of the interface. + * @param enmInterface Type of the interface. + * @param pvUser Opaque user data passed on every function call. + * @param ppVDIfs Pointer to the VD interface list. + */ +DECLINLINE(int) VDInterfaceAdd(PVDINTERFACE pInterface, const char *pszName, + VDINTERFACETYPE enmInterface, void *pvUser, + size_t cbInterface, PVDINTERFACE *ppVDIfs) +{ + /* Argument checks. */ + AssertMsgReturn( enmInterface >= VDINTERFACETYPE_FIRST + && enmInterface < VDINTERFACETYPE_INVALID, + ("enmInterface=%u", enmInterface), VERR_INVALID_PARAMETER); + + AssertMsgReturn(VALID_PTR(ppVDIfs), + ("pInterfaceList=%#p", ppVDIfs), + VERR_INVALID_PARAMETER); + + /* Fill out interface descriptor. */ + pInterface->u32Magic = VDINTERFACE_MAGIC; + pInterface->cbSize = cbInterface; + pInterface->pszInterfaceName = pszName; + pInterface->enmInterface = enmInterface; + pInterface->pvUser = pvUser; + pInterface->pNext = *ppVDIfs; + + /* Remember the new start of the list. */ + *ppVDIfs = pInterface; + + return VINF_SUCCESS; +} + +/** + * Removes an interface from a list of interfaces. + * + * @return VBox status code + * @param pInterface Pointer to an initialized common interface structure to remove. + * @param ppVDIfs Pointer to the VD interface list to remove from. + */ +DECLINLINE(int) VDInterfaceRemove(PVDINTERFACE pInterface, PVDINTERFACE *ppVDIfs) +{ + int rc = VERR_NOT_FOUND; + + /* Argument checks. */ + AssertMsgReturn(VALID_PTR(pInterface), + ("pInterface=%#p", pInterface), + VERR_INVALID_PARAMETER); + + AssertMsgReturn(VALID_PTR(ppVDIfs), + ("pInterfaceList=%#p", ppVDIfs), + VERR_INVALID_PARAMETER); + + if (*ppVDIfs) + { + PVDINTERFACE pPrev = NULL; + PVDINTERFACE pCurr = *ppVDIfs; + + while ( pCurr + && (pCurr != pInterface)) + { + pPrev = pCurr; + pCurr = pCurr->pNext; + } + + /* First interface */ + if (!pPrev) + { + *ppVDIfs = pCurr->pNext; + rc = VINF_SUCCESS; + } + else if (pCurr) + { + pPrev = pCurr->pNext; + rc = VINF_SUCCESS; + } + } + + return rc; +} + +/** + * Interface to deliver error messages (and also informational messages) + * to upper layers. + * + * Per-disk interface. Optional, but think twice if you want to miss the + * opportunity of reporting better human-readable error messages. + */ +typedef struct VDINTERFACEERROR +{ + /** + * Common interface header. + */ + VDINTERFACE Core; + + /** + * Error message callback. Must be able to accept special IPRT format + * strings. + * + * @param pvUser The opaque data passed on container creation. + * @param rc The VBox error code. + * @param RT_SRC_POS_DECL Use RT_SRC_POS. + * @param pszFormat Error message format string. + * @param va Error message arguments. + */ + DECLR3CALLBACKMEMBER(void, pfnError, (void *pvUser, int rc, RT_SRC_POS_DECL, const char *pszFormat, va_list va)); + + /** + * Informational message callback. May be NULL. Used e.g. in + * VDDumpImages(). Must be able to accept special IPRT format strings. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pszFormat Message format string. + * @param va Message arguments. + */ + DECLR3CALLBACKMEMBER(int, pfnMessage, (void *pvUser, const char *pszFormat, va_list va)); + +} VDINTERFACEERROR, *PVDINTERFACEERROR; + +/** + * Get error interface from interface list. + * + * @return Pointer to the first error interface in the list. + * @param pVDIfs Pointer to the interface list. + */ +DECLINLINE(PVDINTERFACEERROR) VDIfErrorGet(PVDINTERFACE pVDIfs) +{ + PVDINTERFACE pIf = VDInterfaceGet(pVDIfs, VDINTERFACETYPE_ERROR); + + /* Check that the interface descriptor is a progress interface. */ + AssertMsgReturn( !pIf + || ( (pIf->enmInterface == VDINTERFACETYPE_ERROR) + && (pIf->cbSize == sizeof(VDINTERFACEERROR))), + ("Not an error interface\n"), NULL); + + return (PVDINTERFACEERROR)pIf; +} + +/** + * Signal an error to the frontend. + * + * @returns VBox status code. + * @param pIfError The error interface. + * @param rc The status code. + * @param RT_SRC_POS_DECL The position in the source code. + * @param pszFormat The format string to pass. + * @param ... Arguments to the format string. + */ +DECLINLINE(int) vdIfError(PVDINTERFACEERROR pIfError, int rc, RT_SRC_POS_DECL, + const char *pszFormat, ...) +{ + va_list va; + va_start(va, pszFormat); + if (pIfError) + pIfError->pfnError(pIfError->Core.pvUser, rc, RT_SRC_POS_ARGS, pszFormat, va); + va_end(va); + return rc; +} + +/** + * Signal an informational message to the frontend. + * + * @returns VBox status code. + * @param pIfError The error interface. + * @param pszFormat The format string to pass. + * @param ... Arguments to the format string. + */ +DECLINLINE(int) vdIfErrorMessage(PVDINTERFACEERROR pIfError, const char *pszFormat, ...) +{ + int rc = VINF_SUCCESS; + va_list va; + va_start(va, pszFormat); + if (pIfError) + rc = pIfError->pfnMessage(pIfError->Core.pvUser, pszFormat, va); + va_end(va); + return rc; +} + +/** + * Completion callback which is called by the interface owner + * to inform the backend that a task finished. + * + * @return VBox status code. + * @param pvUser Opaque user data which is passed on request submission. + * @param rcReq Status code of the completed request. + */ +typedef DECLCALLBACK(int) FNVDCOMPLETED(void *pvUser, int rcReq); +/** Pointer to FNVDCOMPLETED() */ +typedef FNVDCOMPLETED *PFNVDCOMPLETED; + +/** + * Support interface for I/O + * + * Per-image. Optional as input. + */ +typedef struct VDINTERFACEIO +{ + /** + * Common interface header. + */ + VDINTERFACE Core; + + /** + * Open callback + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pszLocation Name of the location to open. + * @param fOpen Flags for opening the backend. + * See RTFILE_O_* #defines, inventing another set + * of open flags is not worth the mapping effort. + * @param pfnCompleted The callback which is called whenever a task + * completed. The backend has to pass the user data + * of the request initiator (ie the one who calls + * VDAsyncRead or VDAsyncWrite) in pvCompletion + * if this is NULL. + * @param ppStorage Where to store the opaque storage handle. + */ + DECLR3CALLBACKMEMBER(int, pfnOpen, (void *pvUser, const char *pszLocation, + uint32_t fOpen, + PFNVDCOMPLETED pfnCompleted, + void **ppStorage)); + + /** + * Close callback. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pStorage The opaque storage handle to close. + */ + DECLR3CALLBACKMEMBER(int, pfnClose, (void *pvUser, void *pStorage)); + + /** + * Delete callback. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pcszFilename Name of the file to delete. + */ + DECLR3CALLBACKMEMBER(int, pfnDelete, (void *pvUser, const char *pcszFilename)); + + /** + * Move callback. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pcszSrc The path to the source file. + * @param pcszDst The path to the destination file. + * This file will be created. + * @param fMove A combination of the RTFILEMOVE_* flags. + */ + DECLR3CALLBACKMEMBER(int, pfnMove, (void *pvUser, const char *pcszSrc, const char *pcszDst, unsigned fMove)); + + /** + * Returns the free space on a disk. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pcszFilename Name of a file to identify the disk. + * @param pcbFreeSpace Where to store the free space of the disk. + */ + DECLR3CALLBACKMEMBER(int, pfnGetFreeSpace, (void *pvUser, const char *pcszFilename, int64_t *pcbFreeSpace)); + + /** + * Returns the last modification timestamp of a file. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pcszFilename Name of a file to identify the disk. + * @param pModificationTime Where to store the timestamp of the file. + */ + DECLR3CALLBACKMEMBER(int, pfnGetModificationTime, (void *pvUser, const char *pcszFilename, PRTTIMESPEC pModificationTime)); + + /** + * Returns the size of the opened storage backend. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pStorage The opaque storage handle to close. + * @param pcbSize Where to store the size of the storage backend. + */ + DECLR3CALLBACKMEMBER(int, pfnGetSize, (void *pvUser, void *pStorage, uint64_t *pcbSize)); + + /** + * Sets the size of the opened storage backend if possible. + * + * @return VBox status code. + * @retval VERR_NOT_SUPPORTED if the backend does not support this operation. + * @param pvUser The opaque data passed on container creation. + * @param pStorage The opaque storage handle to close. + * @param cbSize The new size of the image. + */ + DECLR3CALLBACKMEMBER(int, pfnSetSize, (void *pvUser, void *pStorage, uint64_t cbSize)); + + /** + * Synchronous write callback. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pStorage The storage handle to use. + * @param uOffset The offset to start from. + * @param pvBuffer Pointer to the bits need to be written. + * @param cbBuffer How many bytes to write. + * @param pcbWritten Where to store how many bytes were actually written. + */ + DECLR3CALLBACKMEMBER(int, pfnWriteSync, (void *pvUser, void *pStorage, uint64_t uOffset, + const void *pvBuffer, size_t cbBuffer, size_t *pcbWritten)); + + /** + * Synchronous read callback. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pStorage The storage handle to use. + * @param uOffset The offset to start from. + * @param pvBuffer Where to store the read bits. + * @param cbBuffer How many bytes to read. + * @param pcbRead Where to store how many bytes were actually read. + */ + DECLR3CALLBACKMEMBER(int, pfnReadSync, (void *pvUser, void *pStorage, uint64_t uOffset, + void *pvBuffer, size_t cbBuffer, size_t *pcbRead)); + + /** + * Flush data to the storage backend. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pStorage The storage handle to flush. + */ + DECLR3CALLBACKMEMBER(int, pfnFlushSync, (void *pvUser, void *pStorage)); + + /** + * Initiate an asynchronous read request. + * + * @return VBox status code. + * @param pvUser The opaque user data passed on container creation. + * @param pStorage The storage handle. + * @param uOffset The offset to start reading from. + * @param paSegments Scatter gather list to store the data in. + * @param cSegments Number of segments in the list. + * @param cbRead How many bytes to read. + * @param pvCompletion The opaque user data which is returned upon completion. + * @param ppTask Where to store the opaque task handle. + */ + DECLR3CALLBACKMEMBER(int, pfnReadAsync, (void *pvUser, void *pStorage, uint64_t uOffset, + PCRTSGSEG paSegments, size_t cSegments, + size_t cbRead, void *pvCompletion, + void **ppTask)); + + /** + * Initiate an asynchronous write request. + * + * @return VBox status code. + * @param pvUser The opaque user data passed on conatiner creation. + * @param pStorage The storage handle. + * @param uOffset The offset to start writing to. + * @param paSegments Scatter gather list of the data to write + * @param cSegments Number of segments in the list. + * @param cbWrite How many bytes to write. + * @param pvCompletion The opaque user data which is returned upon completion. + * @param ppTask Where to store the opaque task handle. + */ + DECLR3CALLBACKMEMBER(int, pfnWriteAsync, (void *pvUser, void *pStorage, uint64_t uOffset, + PCRTSGSEG paSegments, size_t cSegments, + size_t cbWrite, void *pvCompletion, + void **ppTask)); + + /** + * Initiates an async flush request. + * + * @return VBox status code. + * @param pvUser The opaque data passed on container creation. + * @param pStorage The storage handle to flush. + * @param pvCompletion The opaque user data which is returned upon completion. + * @param ppTask Where to store the opaque task handle. + */ + DECLR3CALLBACKMEMBER(int, pfnFlushAsync, (void *pvUser, void *pStorage, + void *pvCompletion, void **ppTask)); + +} VDINTERFACEIO, *PVDINTERFACEIO; + +/** + * Get I/O interface from interface list. + * + * @return Pointer to the first I/O interface in the list. + * @param pVDIfs Pointer to the interface list. + */ +DECLINLINE(PVDINTERFACEIO) VDIfIoGet(PVDINTERFACE pVDIfs) +{ + PVDINTERFACE pIf = VDInterfaceGet(pVDIfs, VDINTERFACETYPE_IO); + + /* Check that the interface descriptor is a progress interface. */ + AssertMsgReturn( !pIf + || ( (pIf->enmInterface == VDINTERFACETYPE_IO) + && (pIf->cbSize == sizeof(VDINTERFACEIO))), + ("Not a I/O interface"), NULL); + + return (PVDINTERFACEIO)pIf; +} + +DECLINLINE(int) vdIfIoFileOpen(PVDINTERFACEIO pIfIo, const char *pszFilename, + uint32_t fOpen, PFNVDCOMPLETED pfnCompleted, + void **ppStorage) +{ + return pIfIo->pfnOpen(pIfIo->Core.pvUser, pszFilename, fOpen, pfnCompleted, ppStorage); +} + +DECLINLINE(int) vdIfIoFileClose(PVDINTERFACEIO pIfIo, void *pStorage) +{ + return pIfIo->pfnClose(pIfIo->Core.pvUser, pStorage); +} + +DECLINLINE(int) vdIfIoFileDelete(PVDINTERFACEIO pIfIo, const char *pszFilename) +{ + return pIfIo->pfnDelete(pIfIo->Core.pvUser, pszFilename); +} + +DECLINLINE(int) vdIfIoFileMove(PVDINTERFACEIO pIfIo, const char *pszSrc, + const char *pszDst, unsigned fMove) +{ + return pIfIo->pfnMove(pIfIo->Core.pvUser, pszSrc, pszDst, fMove); +} + +DECLINLINE(int) vdIfIoFileGetFreeSpace(PVDINTERFACEIO pIfIo, const char *pszFilename, + int64_t *pcbFree) +{ + return pIfIo->pfnGetFreeSpace(pIfIo->Core.pvUser, pszFilename, pcbFree); +} + +DECLINLINE(int) vdIfIoFileGetModificationTime(PVDINTERFACEIO pIfIo, const char *pcszFilename, + PRTTIMESPEC pModificationTime) +{ + return pIfIo->pfnGetModificationTime(pIfIo->Core.pvUser, pcszFilename, + pModificationTime); +} + +DECLINLINE(int) vdIfIoFileGetSize(PVDINTERFACEIO pIfIo, void *pStorage, + uint64_t *pcbSize) +{ + return pIfIo->pfnGetSize(pIfIo->Core.pvUser, pStorage, pcbSize); +} + +DECLINLINE(int) vdIfIoFileSetSize(PVDINTERFACEIO pIfIo, void *pStorage, + uint64_t cbSize) +{ + return pIfIo->pfnSetSize(pIfIo->Core.pvUser, pStorage, cbSize); +} + +DECLINLINE(int) vdIfIoFileWriteSync(PVDINTERFACEIO pIfIo, void *pStorage, + uint64_t uOffset, const void *pvBuffer, size_t cbBuffer, + size_t *pcbWritten) +{ + return pIfIo->pfnWriteSync(pIfIo->Core.pvUser, pStorage, uOffset, + pvBuffer, cbBuffer, pcbWritten); +} + +DECLINLINE(int) vdIfIoFileReadSync(PVDINTERFACEIO pIfIo, void *pStorage, + uint64_t uOffset, void *pvBuffer, size_t cbBuffer, + size_t *pcbRead) +{ + return pIfIo->pfnReadSync(pIfIo->Core.pvUser, pStorage, uOffset, + pvBuffer, cbBuffer, pcbRead); +} + +DECLINLINE(int) vdIfIoFileFlushSync(PVDINTERFACEIO pIfIo, void *pStorage) +{ + return pIfIo->pfnFlushSync(pIfIo->Core.pvUser, pStorage); +} + +/** + * Callback which provides progress information about a currently running + * lengthy operation. + * + * @return VBox status code. + * @param pvUser The opaque user data associated with this interface. + * @param uPercent Completion percentage. + */ +typedef DECLCALLBACK(int) FNVDPROGRESS(void *pvUser, unsigned uPercentage); +/** Pointer to FNVDPROGRESS() */ +typedef FNVDPROGRESS *PFNVDPROGRESS; + +/** + * Progress notification interface + * + * Per-operation. Optional. + */ +typedef struct VDINTERFACEPROGRESS +{ + /** + * Common interface header. + */ + VDINTERFACE Core; + + /** + * Progress notification callbacks. + */ + PFNVDPROGRESS pfnProgress; + +} VDINTERFACEPROGRESS, *PVDINTERFACEPROGRESS; + +/** + * Get progress interface from interface list. + * + * @return Pointer to the first progress interface in the list. + * @param pVDIfs Pointer to the interface list. + */ +DECLINLINE(PVDINTERFACEPROGRESS) VDIfProgressGet(PVDINTERFACE pVDIfs) +{ + PVDINTERFACE pIf = VDInterfaceGet(pVDIfs, VDINTERFACETYPE_PROGRESS); + + /* Check that the interface descriptor is a progress interface. */ + AssertMsgReturn( !pIf + || ( (pIf->enmInterface == VDINTERFACETYPE_PROGRESS) + && (pIf->cbSize == sizeof(VDINTERFACEPROGRESS))), + ("Not a progress interface"), NULL); + + return (PVDINTERFACEPROGRESS)pIf; +} + + +/** + * Configuration information interface + * + * Per-image. Optional for most backends, but mandatory for images which do + * not operate on files (including standard block or character devices). + */ +typedef struct VDINTERFACECONFIG +{ + /** + * Common interface header. + */ + VDINTERFACE Core; + + /** + * Validates that the keys are within a set of valid names. + * + * @return true if all key names are found in pszzAllowed. + * @return false if not. + * @param pvUser The opaque user data associated with this interface. + * @param pszzValid List of valid key names separated by '\\0' and ending with + * a double '\\0'. + */ + DECLR3CALLBACKMEMBER(bool, pfnAreKeysValid, (void *pvUser, const char *pszzValid)); + + /** + * Retrieves the length of the string value associated with a key (including + * the terminator, for compatibility with CFGMR3QuerySize). + * + * @return VBox status code. + * VERR_CFGM_VALUE_NOT_FOUND means that the key is not known. + * @param pvUser The opaque user data associated with this interface. + * @param pszName Name of the key to query. + * @param pcbValue Where to store the value length. Non-NULL. + */ + DECLR3CALLBACKMEMBER(int, pfnQuerySize, (void *pvUser, const char *pszName, size_t *pcbValue)); + + /** + * Query the string value associated with a key. + * + * @return VBox status code. + * VERR_CFGM_VALUE_NOT_FOUND means that the key is not known. + * VERR_CFGM_NOT_ENOUGH_SPACE means that the buffer is not big enough. + * @param pvUser The opaque user data associated with this interface. + * @param pszName Name of the key to query. + * @param pszValue Pointer to buffer where to store value. + * @param cchValue Length of value buffer. + */ + DECLR3CALLBACKMEMBER(int, pfnQuery, (void *pvUser, const char *pszName, char *pszValue, size_t cchValue)); + +} VDINTERFACECONFIG, *PVDINTERFACECONFIG; + +/** + * Get configuration information interface from interface list. + * + * @return Pointer to the first configuration information interface in the list. + * @param pVDIfs Pointer to the interface list. + */ +DECLINLINE(PVDINTERFACECONFIG) VDIfConfigGet(PVDINTERFACE pVDIfs) +{ + PVDINTERFACE pIf = VDInterfaceGet(pVDIfs, VDINTERFACETYPE_CONFIG); + + /* Check that the interface descriptor is a progress interface. */ + AssertMsgReturn( !pIf + || ( (pIf->enmInterface == VDINTERFACETYPE_CONFIG) + && (pIf->cbSize == sizeof(VDINTERFACECONFIG))), + ("Not a config interface"), NULL); + + return (PVDINTERFACECONFIG)pIf; +} + +/** + * Query configuration, validates that the keys are within a set of valid names. + * + * @return true if all key names are found in pszzAllowed. + * @return false if not. + * @param pCfgIf Pointer to configuration callback table. + * @param pszzValid List of valid names separated by '\\0' and ending with + * a double '\\0'. + */ +DECLINLINE(bool) VDCFGAreKeysValid(PVDINTERFACECONFIG pCfgIf, const char *pszzValid) +{ + return pCfgIf->pfnAreKeysValid(pCfgIf->Core.pvUser, pszzValid); +} + +/** + * Query configuration, unsigned 64-bit integer value with default. + * + * @return VBox status code. + * @param pCfgIf Pointer to configuration callback table. + * @param pszName Name of an integer value + * @param pu64 Where to store the value. Set to default on failure. + * @param u64Def The default value. + */ +DECLINLINE(int) VDCFGQueryU64Def(PVDINTERFACECONFIG pCfgIf, + const char *pszName, uint64_t *pu64, + uint64_t u64Def) +{ + char aszBuf[32]; + int rc = pCfgIf->pfnQuery(pCfgIf->Core.pvUser, pszName, aszBuf, sizeof(aszBuf)); + if (RT_SUCCESS(rc)) + { + rc = RTStrToUInt64Full(aszBuf, 0, pu64); + } + else if (rc == VERR_CFGM_VALUE_NOT_FOUND) + { + rc = VINF_SUCCESS; + *pu64 = u64Def; + } + return rc; +} + +/** + * Query configuration, unsigned 32-bit integer value with default. + * + * @return VBox status code. + * @param pCfgIf Pointer to configuration callback table. + * @param pszName Name of an integer value + * @param pu32 Where to store the value. Set to default on failure. + * @param u32Def The default value. + */ +DECLINLINE(int) VDCFGQueryU32Def(PVDINTERFACECONFIG pCfgIf, + const char *pszName, uint32_t *pu32, + uint32_t u32Def) +{ + uint64_t u64; + int rc = VDCFGQueryU64Def(pCfgIf, pszName, &u64, u32Def); + if (RT_SUCCESS(rc)) + { + if (!(u64 & UINT64_C(0xffffffff00000000))) + *pu32 = (uint32_t)u64; + else + rc = VERR_CFGM_INTEGER_TOO_BIG; + } + return rc; +} + +/** + * Query configuration, bool value with default. + * + * @return VBox status code. + * @param pCfgIf Pointer to configuration callback table. + * @param pszName Name of an integer value + * @param pf Where to store the value. Set to default on failure. + * @param fDef The default value. + */ +DECLINLINE(int) VDCFGQueryBoolDef(PVDINTERFACECONFIG pCfgIf, + const char *pszName, bool *pf, + bool fDef) +{ + uint64_t u64; + int rc = VDCFGQueryU64Def(pCfgIf, pszName, &u64, fDef); + if (RT_SUCCESS(rc)) + *pf = u64 ? true : false; + return rc; +} + +/** + * Query configuration, dynamically allocated (RTMemAlloc) zero terminated + * character value. + * + * @return VBox status code. + * @param pCfgIf Pointer to configuration callback table. + * @param pszName Name of an zero terminated character value + * @param ppszString Where to store the string pointer. Not set on failure. + * Free this using RTMemFree(). + */ +DECLINLINE(int) VDCFGQueryStringAlloc(PVDINTERFACECONFIG pCfgIf, + const char *pszName, char **ppszString) +{ + size_t cb; + int rc = pCfgIf->pfnQuerySize(pCfgIf->Core.pvUser, pszName, &cb); + if (RT_SUCCESS(rc)) + { + char *pszString = (char *)RTMemAlloc(cb); + if (pszString) + { + rc = pCfgIf->pfnQuery(pCfgIf->Core.pvUser, pszName, pszString, cb); + if (RT_SUCCESS(rc)) + *ppszString = pszString; + else + RTMemFree(pszString); + } + else + rc = VERR_NO_MEMORY; + } + return rc; +} + +/** + * Query configuration, dynamically allocated (RTMemAlloc) zero terminated + * character value with default. + * + * @return VBox status code. + * @param pCfgIf Pointer to configuration callback table. + * @param pszName Name of an zero terminated character value + * @param ppszString Where to store the string pointer. Not set on failure. + * Free this using RTMemFree(). + * @param pszDef The default value. + */ +DECLINLINE(int) VDCFGQueryStringAllocDef(PVDINTERFACECONFIG pCfgIf, + const char *pszName, + char **ppszString, + const char *pszDef) +{ + size_t cb; + int rc = pCfgIf->pfnQuerySize(pCfgIf->Core.pvUser, pszName, &cb); + if (rc == VERR_CFGM_VALUE_NOT_FOUND || rc == VERR_CFGM_NO_PARENT) + { + cb = strlen(pszDef) + 1; + rc = VINF_SUCCESS; + } + if (RT_SUCCESS(rc)) + { + char *pszString = (char *)RTMemAlloc(cb); + if (pszString) + { + rc = pCfgIf->pfnQuery(pCfgIf->Core.pvUser, pszName, pszString, cb); + if (rc == VERR_CFGM_VALUE_NOT_FOUND || rc == VERR_CFGM_NO_PARENT) + { + memcpy(pszString, pszDef, cb); + rc = VINF_SUCCESS; + } + if (RT_SUCCESS(rc)) + *ppszString = pszString; + else + RTMemFree(pszString); + } + else + rc = VERR_NO_MEMORY; + } + return rc; +} + +/** + * Query configuration, dynamically allocated (RTMemAlloc) byte string value. + * + * @return VBox status code. + * @param pCfgIf Pointer to configuration callback table. + * @param pszName Name of an zero terminated character value + * @param ppvData Where to store the byte string pointer. Not set on failure. + * Free this using RTMemFree(). + * @param pcbData Where to store the byte string length. + */ +DECLINLINE(int) VDCFGQueryBytesAlloc(PVDINTERFACECONFIG pCfgIf, + const char *pszName, void **ppvData, size_t *pcbData) +{ + size_t cb; + int rc = pCfgIf->pfnQuerySize(pCfgIf->Core.pvUser, pszName, &cb); + if (RT_SUCCESS(rc)) + { + char *pbData; + Assert(cb); + + pbData = (char *)RTMemAlloc(cb); + if (pbData) + { + rc = pCfgIf->pfnQuery(pCfgIf->Core.pvUser, pszName, pbData, cb); + if (RT_SUCCESS(rc)) + { + *ppvData = pbData; + *pcbData = cb - 1; /* Exclude terminator of the queried string. */ + } + else + RTMemFree(pbData); + } + else + rc = VERR_NO_MEMORY; + } + return rc; +} + +/** Forward declaration of a VD socket. */ +typedef struct VDSOCKETINT *VDSOCKET; +/** Pointer to a VD socket. */ +typedef VDSOCKET *PVDSOCKET; +/** Nil socket handle. */ +#define NIL_VDSOCKET ((VDSOCKET)0) + +/** Connect flag to indicate that the backend wants to use the extended + * socket I/O multiplexing call. This might not be supported on all configurations + * (internal networking and iSCSI) + * and the backend needs to take appropriate action. + */ +#define VD_INTERFACETCPNET_CONNECT_EXTENDED_SELECT RT_BIT_32(0) + +/** @name Select events + * @{ */ +/** Readable without blocking. */ +#define VD_INTERFACETCPNET_EVT_READ RT_BIT_32(0) +/** Writable without blocking. */ +#define VD_INTERFACETCPNET_EVT_WRITE RT_BIT_32(1) +/** Error condition, hangup, exception or similar. */ +#define VD_INTERFACETCPNET_EVT_ERROR RT_BIT_32(2) +/** Hint for the select that getting interrupted while waiting is more likely. + * The interface implementation can optimize the waiting strategy based on this. + * It is assumed that it is more likely to get one of the above socket events + * instead of being interrupted if the flag is not set. */ +#define VD_INTERFACETCPNET_HINT_INTERRUPT RT_BIT_32(3) +/** Mask of the valid bits. */ +#define VD_INTERFACETCPNET_EVT_VALID_MASK UINT32_C(0x0000000f) +/** @} */ + +/** + * TCP network stack interface + * + * Per-image. Mandatory for backends which have the VD_CAP_TCPNET bit set. + */ +typedef struct VDINTERFACETCPNET +{ + /** + * Common interface header. + */ + VDINTERFACE Core; + + /** + * Creates a socket. The socket is not connected if this succeeds. + * + * @return iprt status code. + * @retval VERR_NOT_SUPPORTED if the combination of flags is not supported. + * @param fFlags Combination of the VD_INTERFACETCPNET_CONNECT_* #defines. + * @param pSock Where to store the handle. + */ + DECLR3CALLBACKMEMBER(int, pfnSocketCreate, (uint32_t fFlags, PVDSOCKET pSock)); + + /** + * Destroys the socket. + * + * @return iprt status code. + * @param Sock Socket descriptor. + */ + DECLR3CALLBACKMEMBER(int, pfnSocketDestroy, (VDSOCKET Sock)); + + /** + * Connect as a client to a TCP port. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pszAddress The address to connect to. + * @param uPort The port to connect to. + */ + DECLR3CALLBACKMEMBER(int, pfnClientConnect, (VDSOCKET Sock, const char *pszAddress, uint32_t uPort)); + + /** + * Close a TCP connection. + * + * @return iprt status code. + * @param Sock Socket descriptor. + */ + DECLR3CALLBACKMEMBER(int, pfnClientClose, (VDSOCKET Sock)); + + /** + * Returns whether the socket is currently connected to the client. + * + * @returns true if the socket is connected. + * false otherwise. + * @param Sock Socket descriptor. + */ + DECLR3CALLBACKMEMBER(bool, pfnIsClientConnected, (VDSOCKET Sock)); + + /** + * Socket I/O multiplexing. + * Checks if the socket is ready for reading. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param cMillies Number of milliseconds to wait for the socket. + * Use RT_INDEFINITE_WAIT to wait for ever. + */ + DECLR3CALLBACKMEMBER(int, pfnSelectOne, (VDSOCKET Sock, RTMSINTERVAL cMillies)); + + /** + * Receive data from a socket. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pvBuffer Where to put the data we read. + * @param cbBuffer Read buffer size. + * @param pcbRead Number of bytes read. + * If NULL the entire buffer will be filled upon successful return. + * If not NULL a partial read can be done successfully. + */ + DECLR3CALLBACKMEMBER(int, pfnRead, (VDSOCKET Sock, void *pvBuffer, size_t cbBuffer, size_t *pcbRead)); + + /** + * Send data to a socket. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pvBuffer Buffer to write data to socket. + * @param cbBuffer How much to write. + */ + DECLR3CALLBACKMEMBER(int, pfnWrite, (VDSOCKET Sock, const void *pvBuffer, size_t cbBuffer)); + + /** + * Send data from scatter/gather buffer to a socket. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pSgBuffer Scatter/gather buffer to write data to socket. + */ + DECLR3CALLBACKMEMBER(int, pfnSgWrite, (VDSOCKET Sock, PCRTSGBUF pSgBuffer)); + + /** + * Receive data from a socket - not blocking. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pvBuffer Where to put the data we read. + * @param cbBuffer Read buffer size. + * @param pcbRead Number of bytes read. + */ + DECLR3CALLBACKMEMBER(int, pfnReadNB, (VDSOCKET Sock, void *pvBuffer, size_t cbBuffer, size_t *pcbRead)); + + /** + * Send data to a socket - not blocking. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pvBuffer Buffer to write data to socket. + * @param cbBuffer How much to write. + * @param pcbWritten Number of bytes written. + */ + DECLR3CALLBACKMEMBER(int, pfnWriteNB, (VDSOCKET Sock, const void *pvBuffer, size_t cbBuffer, size_t *pcbWritten)); + + /** + * Send data from scatter/gather buffer to a socket - not blocking. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pSgBuffer Scatter/gather buffer to write data to socket. + * @param pcbWritten Number of bytes written. + */ + DECLR3CALLBACKMEMBER(int, pfnSgWriteNB, (VDSOCKET Sock, PRTSGBUF pSgBuffer, size_t *pcbWritten)); + + /** + * Flush socket write buffers. + * + * @return iprt status code. + * @param Sock Socket descriptor. + */ + DECLR3CALLBACKMEMBER(int, pfnFlush, (VDSOCKET Sock)); + + /** + * Enables or disables delaying sends to coalesce packets. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param fEnable When set to true enables coalescing. + */ + DECLR3CALLBACKMEMBER(int, pfnSetSendCoalescing, (VDSOCKET Sock, bool fEnable)); + + /** + * Gets the address of the local side. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pAddr Where to store the local address on success. + */ + DECLR3CALLBACKMEMBER(int, pfnGetLocalAddress, (VDSOCKET Sock, PRTNETADDR pAddr)); + + /** + * Gets the address of the other party. + * + * @return iprt status code. + * @param Sock Socket descriptor. + * @param pAddr Where to store the peer address on success. + */ + DECLR3CALLBACKMEMBER(int, pfnGetPeerAddress, (VDSOCKET Sock, PRTNETADDR pAddr)); + + /** + * Socket I/O multiplexing - extended version which can be woken up. + * Checks if the socket is ready for reading or writing. + * + * @return iprt status code. + * @retval VERR_INTERRUPTED if the thread was woken up by a pfnPoke call. + * @param Sock Socket descriptor. + * @param fEvents Mask of events to wait for. + * @param pfEvents Where to store the received events. + * @param cMillies Number of milliseconds to wait for the socket. + * Use RT_INDEFINITE_WAIT to wait for ever. + */ + DECLR3CALLBACKMEMBER(int, pfnSelectOneEx, (VDSOCKET Sock, uint32_t fEvents, + uint32_t *pfEvents, RTMSINTERVAL cMillies)); + + /** + * Wakes up the thread waiting in pfnSelectOneEx. + * + * @return iprt status code. + * @param Sock Socket descriptor. + */ + DECLR3CALLBACKMEMBER(int, pfnPoke, (VDSOCKET Sock)); + +} VDINTERFACETCPNET, *PVDINTERFACETCPNET; + +/** + * Get TCP network stack interface from interface list. + * + * @return Pointer to the first TCP network stack interface in the list. + * @param pVDIfs Pointer to the interface list. + */ +DECLINLINE(PVDINTERFACETCPNET) VDIfTcpNetGet(PVDINTERFACE pVDIfs) +{ + PVDINTERFACE pIf = VDInterfaceGet(pVDIfs, VDINTERFACETYPE_TCPNET); + + /* Check that the interface descriptor is a progress interface. */ + AssertMsgReturn( !pIf + || ( (pIf->enmInterface == VDINTERFACETYPE_TCPNET) + && (pIf->cbSize == sizeof(VDINTERFACETCPNET))), + ("Not a TCP net interface"), NULL); + + return (PVDINTERFACETCPNET)pIf; +} + + +/** + * Interface to synchronize concurrent accesses by several threads. + * + * @note The scope of this interface is to manage concurrent accesses after + * the HDD container has been created, and they must stop before destroying the + * container. Opening or closing images is covered by the synchronization, but + * that does not mean it is safe to close images while a thread executes + * <link to="VDMerge"/> or <link to="VDCopy"/> operating on these images. + * Making them safe would require the lock to be held during the entire + * operation, which prevents other concurrent acitivities. + * + * @note Right now this is kept as simple as possible, and does not even + * attempt to provide enough information to allow e.g. concurrent write + * accesses to different areas of the disk. The reason is that it is very + * difficult to predict which area of a disk is affected by a write, + * especially when different image formats are mixed. Maybe later a more + * sophisticated interface will be provided which has the necessary information + * about worst case affected areas. + * + * Per-disk interface. Optional, needed if the disk is accessed concurrently + * by several threads, e.g. when merging diff images while a VM is running. + */ +typedef struct VDINTERFACETHREADSYNC +{ + /** + * Common interface header. + */ + VDINTERFACE Core; + + /** + * Start a read operation. + */ + DECLR3CALLBACKMEMBER(int, pfnStartRead, (void *pvUser)); + + /** + * Finish a read operation. + */ + DECLR3CALLBACKMEMBER(int, pfnFinishRead, (void *pvUser)); + + /** + * Start a write operation. + */ + DECLR3CALLBACKMEMBER(int, pfnStartWrite, (void *pvUser)); + + /** + * Finish a write operation. + */ + DECLR3CALLBACKMEMBER(int, pfnFinishWrite, (void *pvUser)); + +} VDINTERFACETHREADSYNC, *PVDINTERFACETHREADSYNC; + +/** + * Get thread synchronization interface from interface list. + * + * @return Pointer to the first thread synchronization interface in the list. + * @param pVDIfs Pointer to the interface list. + */ +DECLINLINE(PVDINTERFACETHREADSYNC) VDIfThreadSyncGet(PVDINTERFACE pVDIfs) +{ + PVDINTERFACE pIf = VDInterfaceGet(pVDIfs, VDINTERFACETYPE_THREADSYNC); + + /* Check that the interface descriptor is a progress interface. */ + AssertMsgReturn( !pIf + || ( (pIf->enmInterface == VDINTERFACETYPE_THREADSYNC) + && (pIf->cbSize == sizeof(VDINTERFACETHREADSYNC))), + ("Not a thread synchronization interface"), NULL); + + return (PVDINTERFACETHREADSYNC)pIf; +} + +/** + * Interface to query usage of disk ranges. + * + * Per-operation interface. Optional. + */ +typedef struct VDINTERFACEQUERYRANGEUSE +{ + /** + * Common interface header. + */ + VDINTERFACE Core; + + /** + * Query use of a disk range. + */ + DECLR3CALLBACKMEMBER(int, pfnQueryRangeUse, (void *pvUser, uint64_t off, uint64_t cb, + bool *pfUsed)); + +} VDINTERFACEQUERYRANGEUSE, *PVDINTERFACEQUERYRANGEUSE; + +/** + * Get query range use interface from interface list. + * + * @return Pointer to the first thread synchronization interface in the list. + * @param pVDIfs Pointer to the interface list. + */ +DECLINLINE(PVDINTERFACEQUERYRANGEUSE) VDIfQueryRangeUseGet(PVDINTERFACE pVDIfs) +{ + PVDINTERFACE pIf = VDInterfaceGet(pVDIfs, VDINTERFACETYPE_QUERYRANGEUSE); + + /* Check that the interface descriptor is a progress interface. */ + AssertMsgReturn( !pIf + || ( (pIf->enmInterface == VDINTERFACETYPE_QUERYRANGEUSE) + && (pIf->cbSize == sizeof(VDINTERFACEQUERYRANGEUSE))), + ("Not a query range use interface"), NULL); + + return (PVDINTERFACEQUERYRANGEUSE)pIf; +} + +DECLINLINE(int) vdIfQueryRangeUse(PVDINTERFACEQUERYRANGEUSE pIfQueryRangeUse, uint64_t off, uint64_t cb, + bool *pfUsed) +{ + return pIfQueryRangeUse->pfnQueryRangeUse(pIfQueryRangeUse->Core.pvUser, off, cb, pfUsed); +} + +RT_C_DECLS_END + +/** @} */ + +#endif |