/** @file * VD Container API - interfaces. */ /* * Copyright (C) 2011-2012 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 #include #include #include #include #include #include #include #include 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 && pIfError->pfnMessage) 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 * or 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