diff options
Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Runtime/common/dvm/dvmvfs.cpp | 1453 |
1 files changed, 1453 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/dvm/dvmvfs.cpp b/src/VBox/Runtime/common/dvm/dvmvfs.cpp new file mode 100644 index 00000000..27be5373 --- /dev/null +++ b/src/VBox/Runtime/common/dvm/dvmvfs.cpp @@ -0,0 +1,1453 @@ +/* $Id: dvmvfs.cpp $ */ +/** @file + * IPRT Disk Volume Management API (DVM) - VFS glue. + */ + +/* + * Copyright (C) 2012-2019 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. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP RTLOGGROUP_FS /** @todo fix log group */ +#include <iprt/types.h> +#include <iprt/assert.h> +#include <iprt/mem.h> +#include <iprt/dvm.h> +#include <iprt/err.h> +#include <iprt/asm.h> +#include <iprt/string.h> +#include <iprt/file.h> +#include <iprt/sg.h> +#include <iprt/vfslowlevel.h> +#include <iprt/poll.h> +#include <iprt/log.h> +#include "internal/dvm.h" + + +/********************************************************************************************************************************* +* Structures and Typedefs * +*********************************************************************************************************************************/ +/** Pointer to a volume manager VFS. */ +typedef struct RTDVMVFSVOL *PRTDVMVFSVOL; + +/** + * The internal data of a DVM volume I/O stream. + */ +typedef struct RTVFSDVMFILE +{ + /** The volume the VFS file belongs to. */ + RTDVMVOLUME hVol; + /** Pointer to the VFS volume. Can be NULL. */ + PRTDVMVFSVOL pVfsVol; + /** Current position. */ + uint64_t offCurPos; + /** Set if readable. */ + bool fCanRead; + /** Set if writable. */ + bool fCanWrite; +} RTVFSDVMFILE; +/** Pointer to a the internal data of a DVM volume file. */ +typedef RTVFSDVMFILE *PRTVFSDVMFILE; + +/** + * The internal data of a DVM volume symlink. + */ +typedef struct RTVFSDVMSYMLINK +{ + /** The DVM volume the symlink represent. */ + RTDVMVOLUME hVol; + /** The DVM volume manager @a hVol belongs to. */ + RTDVM hVolMgr; + /** The symlink name. */ + char *pszSymlink; + /** The symlink target (volXX). */ + char szTarget[16]; +} RTVFSDVMSYMLINK; +/** Pointer to a the internal data of a DVM volume file. */ +typedef RTVFSDVMSYMLINK *PRTVFSDVMSYMLINK; + +/** + * The volume manager VFS (root) dir data. + */ +typedef struct RTDVMVFSDIR +{ + /** Pointer to the VFS volume. */ + PRTDVMVFSVOL pVfsVol; + /** The current directory offset. */ + uint32_t offDir; + /** Set if we need to try return hCurVolume again because of buffer overflow. */ + bool fReturnCurrent; + /** Pointer to name alias string (returned by RTDvmVolumeQueryName, free it). */ + char *pszNameAlias; + /** The current DVM volume. */ + RTDVMVOLUME hCurVolume; +} RTDVMVFSDIR; +/** Pointer to a volume manager VFS (root) dir. */ +typedef RTDVMVFSDIR *PRTDVMVFSDIR; + +/** + * A volume manager VFS for use in chains (thing pseudo/devfs). + */ +typedef struct RTDVMVFSVOL +{ + /** The volume manager. */ + RTDVM hVolMgr; + /** Whether to close it on success. */ + bool fCloseDvm; + /** Whether the access is read-only. */ + bool fReadOnly; + /** Number of volumes. */ + uint32_t cVolumes; + /** Self reference. */ + RTVFS hVfsSelf; +} RTDVMVFSVOL; + + +/********************************************************************************************************************************* +* Internal Functions * +*********************************************************************************************************************************/ +static DECLCALLBACK(int) rtDvmVfsVol_OpenRoot(void *pvThis, PRTVFSDIR phVfsDir); + + +/** + * @interface_method_impl{RTVFSOBJOPS,pfnClose} + */ +static DECLCALLBACK(int) rtDvmVfsFile_Close(void *pvThis) +{ + PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis; + + RTDvmVolumeRelease(pThis->hVol); + return VINF_SUCCESS; +} + + +/** + * Worker for rtDvmVfsFile_QueryInfoWorker and rtDvmVfsSym_QueryInfoWorker. + */ +static int rtDvmVfsFileSym_QueryAddAttrWorker(RTDVMVOLUME hVolume, RTDVM hVolMgr, + PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr) +{ + switch (enmAddAttr) + { + case RTFSOBJATTRADD_NOTHING: + case RTFSOBJATTRADD_UNIX: + pObjInfo->Attr.u.Unix.uid = (RTUID)RTDvmVolumeGetType(hVolume); + pObjInfo->Attr.u.Unix.gid = hVolMgr != NIL_RTDVM ? (RTGID)RTDvmMapGetFormatType(hVolMgr) : NIL_RTGID; + pObjInfo->Attr.u.Unix.cHardlinks = 1; + pObjInfo->Attr.u.Unix.INodeIdDevice = 0; + pObjInfo->Attr.u.Unix.INodeId = 0; + pObjInfo->Attr.u.Unix.fFlags = 0; + pObjInfo->Attr.u.Unix.GenerationId = 0; + pObjInfo->Attr.u.Unix.Device = 0; + break; + + case RTFSOBJATTRADD_UNIX_OWNER: + { + RTDVMVOLTYPE enmType = RTDvmVolumeGetType(hVolume); + pObjInfo->Attr.u.UnixOwner.uid = (RTUID)enmType; + RTStrCopy(pObjInfo->Attr.u.UnixOwner.szName, sizeof(pObjInfo->Attr.u.UnixOwner.szName), + RTDvmVolumeTypeGetDescr(enmType)); + break; + } + + case RTFSOBJATTRADD_UNIX_GROUP: + if (hVolMgr != NIL_RTDVM) + { + pObjInfo->Attr.u.UnixGroup.gid = (RTGID)RTDvmMapGetFormatType(hVolMgr); + RTStrCopy(pObjInfo->Attr.u.UnixGroup.szName, sizeof(pObjInfo->Attr.u.UnixGroup.szName), + RTDvmMapGetFormatName(hVolMgr)); + } + else + { + pObjInfo->Attr.u.UnixGroup.gid = NIL_RTGID; + pObjInfo->Attr.u.UnixGroup.szName[0] = '\0'; + } + break; + + case RTFSOBJATTRADD_EASIZE: + pObjInfo->Attr.u.EASize.cb = 0; + break; + + default: + return VERR_INVALID_PARAMETER; + } + return VINF_SUCCESS; +} + + +/** + * Worker for rtDvmVfsFile_QueryInfo, rtDvmVfsDir_QueryEntryInfo, and + * rtDvmVfsDir_ReadDir. + */ +static int rtDvmVfsFile_QueryInfoWorker(RTDVMVOLUME hVolume, RTDVM hVolMgr, bool fReadOnly, + PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr) +{ + + pObjInfo->cbObject = RTDvmVolumeGetSize(hVolume); + pObjInfo->cbAllocated = pObjInfo->cbObject; + RTTimeSpecSetNano(&pObjInfo->AccessTime, 0); + RTTimeSpecSetNano(&pObjInfo->ModificationTime, 0); + RTTimeSpecSetNano(&pObjInfo->ChangeTime, 0); + RTTimeSpecSetNano(&pObjInfo->BirthTime, 0); + pObjInfo->Attr.fMode = RTFS_TYPE_FILE | RTFS_DOS_NT_NORMAL; + if (fReadOnly) + pObjInfo->Attr.fMode |= RTFS_DOS_READONLY | 0444; + else + pObjInfo->Attr.fMode |= 0666; + + return rtDvmVfsFileSym_QueryAddAttrWorker(hVolume, hVolMgr, pObjInfo, enmAddAttr); +} + + +/** + * @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo} + */ +static DECLCALLBACK(int) rtDvmVfsFile_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr) +{ + PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis; + return rtDvmVfsFile_QueryInfoWorker(pThis->hVol, + pThis->pVfsVol ? pThis->pVfsVol->hVolMgr : NIL_RTDVM, + pThis->pVfsVol ? pThis->pVfsVol->fReadOnly : !pThis->fCanWrite, + pObjInfo, enmAddAttr); +} + + +/** + * @interface_method_impl{RTVFSIOSTREAMOPS,pfnRead} + */ +static DECLCALLBACK(int) rtDvmVfsFile_Read(void *pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbRead) +{ + PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis; + int rc = VINF_SUCCESS; + + Assert(pSgBuf->cSegs == 1); + NOREF(fBlocking); + + /* + * Find the current position and check if it's within the volume. + */ + uint64_t offUnsigned = off < 0 ? pThis->offCurPos : (uint64_t)off; + if (offUnsigned >= RTDvmVolumeGetSize(pThis->hVol)) + { + if (pcbRead) + { + *pcbRead = 0; + pThis->offCurPos = offUnsigned; + return VINF_EOF; + } + return VERR_EOF; + } + + size_t cbLeftToRead; + if (offUnsigned + pSgBuf->paSegs[0].cbSeg > RTDvmVolumeGetSize(pThis->hVol)) + { + if (!pcbRead) + return VERR_EOF; + *pcbRead = cbLeftToRead = (size_t)(RTDvmVolumeGetSize(pThis->hVol) - offUnsigned); + } + else + { + cbLeftToRead = pSgBuf->paSegs[0].cbSeg; + if (pcbRead) + *pcbRead = cbLeftToRead; + } + + /* + * Ok, we've got a valid stretch within the file. Do the reading. + */ + if (cbLeftToRead > 0) + { + rc = RTDvmVolumeRead(pThis->hVol, offUnsigned, pSgBuf->paSegs[0].pvSeg, cbLeftToRead); + if (RT_SUCCESS(rc)) + offUnsigned += cbLeftToRead; + } + + pThis->offCurPos = offUnsigned; + return rc; +} + + +/** + * @interface_method_impl{RTVFSIOSTREAMOPS,pfnWrite} + */ +static DECLCALLBACK(int) rtDvmVfsFile_Write(void *pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbWritten) +{ + PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis; + int rc = VINF_SUCCESS; + + Assert(pSgBuf->cSegs == 1); + NOREF(fBlocking); + + /* + * Find the current position and check if it's within the volume. + * Writing beyond the end of a volume is not supported. + */ + uint64_t offUnsigned = off < 0 ? pThis->offCurPos : (uint64_t)off; + if (offUnsigned >= RTDvmVolumeGetSize(pThis->hVol)) + { + if (pcbWritten) + { + *pcbWritten = 0; + pThis->offCurPos = offUnsigned; + } + return VERR_NOT_SUPPORTED; + } + + size_t cbLeftToWrite; + if (offUnsigned + pSgBuf->paSegs[0].cbSeg > RTDvmVolumeGetSize(pThis->hVol)) + { + if (!pcbWritten) + return VERR_EOF; + *pcbWritten = cbLeftToWrite = (size_t)(RTDvmVolumeGetSize(pThis->hVol) - offUnsigned); + } + else + { + cbLeftToWrite = pSgBuf->paSegs[0].cbSeg; + if (pcbWritten) + *pcbWritten = cbLeftToWrite; + } + + /* + * Ok, we've got a valid stretch within the file. Do the reading. + */ + if (cbLeftToWrite > 0) + { + rc = RTDvmVolumeWrite(pThis->hVol, offUnsigned, pSgBuf->paSegs[0].pvSeg, cbLeftToWrite); + if (RT_SUCCESS(rc)) + offUnsigned += cbLeftToWrite; + } + + pThis->offCurPos = offUnsigned; + return rc; +} + + +/** + * @interface_method_impl{RTVFSIOSTREAMOPS,pfnFlush} + */ +static DECLCALLBACK(int) rtDvmVfsFile_Flush(void *pvThis) +{ + NOREF(pvThis); + return VINF_SUCCESS; /** @todo Implement missing DVM API. */ +} + + +/** + * @interface_method_impl{RTVFSIOSTREAMOPS,pfnTell} + */ +static DECLCALLBACK(int) rtDvmVfsFile_Tell(void *pvThis, PRTFOFF poffActual) +{ + PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis; + *poffActual = pThis->offCurPos; + return VINF_SUCCESS; +} + + +/** + * @interface_method_impl{RTVFSOBJSETOPS,pfnMode} + */ +static DECLCALLBACK(int) rtDvmVfsFile_SetMode(void *pvThis, RTFMODE fMode, RTFMODE fMask) +{ + NOREF(pvThis); + NOREF(fMode); + NOREF(fMask); + return VERR_NOT_SUPPORTED; +} + + +/** + * @interface_method_impl{RTVFSOBJSETOPS,pfnSetTimes} + */ +static DECLCALLBACK(int) rtDvmVfsFile_SetTimes(void *pvThis, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime, + PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime) +{ + NOREF(pvThis); + NOREF(pAccessTime); + NOREF(pModificationTime); + NOREF(pChangeTime); + NOREF(pBirthTime); + return VERR_NOT_SUPPORTED; +} + + +/** + * @interface_method_impl{RTVFSOBJSETOPS,pfnSetOwner} + */ +static DECLCALLBACK(int) rtDvmVfsFile_SetOwner(void *pvThis, RTUID uid, RTGID gid) +{ + NOREF(pvThis); + NOREF(uid); + NOREF(gid); + return VERR_NOT_SUPPORTED; +} + + +/** + * @interface_method_impl{RTVFSFILEOPS,pfnSeek} + */ +static DECLCALLBACK(int) rtDvmVfsFile_Seek(void *pvThis, RTFOFF offSeek, unsigned uMethod, PRTFOFF poffActual) +{ + PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis; + + /* + * Seek relative to which position. + */ + uint64_t offWrt; + switch (uMethod) + { + case RTFILE_SEEK_BEGIN: + offWrt = 0; + break; + + case RTFILE_SEEK_CURRENT: + offWrt = pThis->offCurPos; + break; + + case RTFILE_SEEK_END: + offWrt = RTDvmVolumeGetSize(pThis->hVol); + break; + + default: + return VERR_INTERNAL_ERROR_5; + } + + /* + * Calc new position, take care to stay within bounds. + * + * @todo: Setting position beyond the end of the volume does not make sense. + */ + uint64_t offNew; + if (offSeek == 0) + offNew = offWrt; + else if (offSeek > 0) + { + offNew = offWrt + offSeek; + if ( offNew < offWrt + || offNew > RTFOFF_MAX) + offNew = RTFOFF_MAX; + } + else if ((uint64_t)-offSeek < offWrt) + offNew = offWrt + offSeek; + else + offNew = 0; + + /* + * Update the state and set return value. + */ + pThis->offCurPos = offNew; + + *poffActual = offNew; + return VINF_SUCCESS; +} + + +/** + * @interface_method_impl{RTVFSFILEOPS,pfnQuerySize} + */ +static DECLCALLBACK(int) rtDvmVfsFile_QuerySize(void *pvThis, uint64_t *pcbFile) +{ + PRTVFSDVMFILE pThis = (PRTVFSDVMFILE)pvThis; + *pcbFile = RTDvmVolumeGetSize(pThis->hVol); + return VINF_SUCCESS; +} + + +/** + * Standard file operations. + */ +DECL_HIDDEN_CONST(const RTVFSFILEOPS) g_rtDvmVfsStdFileOps = +{ + { /* Stream */ + { /* Obj */ + RTVFSOBJOPS_VERSION, + RTVFSOBJTYPE_FILE, + "DvmFile", + rtDvmVfsFile_Close, + rtDvmVfsFile_QueryInfo, + RTVFSOBJOPS_VERSION + }, + RTVFSIOSTREAMOPS_VERSION, + RTVFSIOSTREAMOPS_FEAT_NO_SG, + rtDvmVfsFile_Read, + rtDvmVfsFile_Write, + rtDvmVfsFile_Flush, + NULL /*pfnPollOne*/, + rtDvmVfsFile_Tell, + NULL /*Skip*/, + NULL /*ZeroFill*/, + RTVFSIOSTREAMOPS_VERSION, + }, + RTVFSFILEOPS_VERSION, + /*RTVFSIOFILEOPS_FEAT_NO_AT_OFFSET*/ 0, + { /* ObjSet */ + RTVFSOBJSETOPS_VERSION, + RT_UOFFSETOF(RTVFSFILEOPS, ObjSet) - RT_UOFFSETOF(RTVFSFILEOPS, Stream.Obj), + rtDvmVfsFile_SetMode, + rtDvmVfsFile_SetTimes, + rtDvmVfsFile_SetOwner, + RTVFSOBJSETOPS_VERSION + }, + rtDvmVfsFile_Seek, + rtDvmVfsFile_QuerySize, + NULL /*SetSize*/, + NULL /*QueryMaxSize*/, + RTVFSFILEOPS_VERSION +}; + + +/** + * Internal worker for RTDvmVolumeCreateVfsFile and rtDvmVfsDir_OpenFile. + * + * @returns IPRT status code. + * @param pVfsVol The VFS volume, optional. + * @param hVol The volume handle. (Reference not consumed.) + * @param fOpen RTFILE_O_XXX (valid). + * @param phVfsFileOut Where to return the handle to the file. + */ +static int rtDvmVfsCreateFileForVolume(PRTDVMVFSVOL pVfsVol, RTDVMVOLUME hVol, uint64_t fOpen, PRTVFSFILE phVfsFileOut) +{ + uint32_t cRefs = RTDvmVolumeRetain(hVol); + AssertReturn(cRefs != UINT32_MAX, VERR_INVALID_HANDLE); + + /* + * Create the volume file. + */ + RTVFSFILE hVfsFile; + PRTVFSDVMFILE pThis; + int rc = RTVfsNewFile(&g_rtDvmVfsStdFileOps, sizeof(*pThis), fOpen, NIL_RTVFS, NIL_RTVFSLOCK, &hVfsFile, (void **)&pThis); + if (RT_SUCCESS(rc)) + { + pThis->offCurPos = 0; + pThis->hVol = hVol; + pThis->fCanRead = RT_BOOL(fOpen & RTFILE_O_READ); + pThis->fCanWrite = RT_BOOL(fOpen & RTFILE_O_WRITE); + pThis->pVfsVol = pVfsVol; + + *phVfsFileOut = hVfsFile; + return VINF_SUCCESS; + } + + RTDvmVolumeRelease(hVol); + return rc; +} + + +RTDECL(int) RTDvmVolumeCreateVfsFile(RTDVMVOLUME hVol, uint64_t fOpen, PRTVFSFILE phVfsFileOut) +{ + AssertPtrReturn(hVol, VERR_INVALID_HANDLE); + AssertPtrReturn(phVfsFileOut, VERR_INVALID_POINTER); + AssertReturn(fOpen & RTFILE_O_ACCESS_MASK, VERR_INVALID_FLAGS); + AssertReturn(!(fOpen & ~RTFILE_O_VALID_MASK), VERR_INVALID_FLAGS); + return rtDvmVfsCreateFileForVolume(NULL, hVol, fOpen, phVfsFileOut); +} + + +/********************************************************************************************************************************* +* DVM Symbolic Link Objects * +*********************************************************************************************************************************/ +/** + * @interface_method_impl{RTVFSOBJOPS,pfnClose} + */ +static DECLCALLBACK(int) rtDvmVfsSym_Close(void *pvThis) +{ + PRTVFSDVMSYMLINK pThis = (PRTVFSDVMSYMLINK)pvThis; + if (pThis->pszSymlink) + { + RTStrFree(pThis->pszSymlink); + pThis->pszSymlink = NULL; + } + if (pThis->hVol != NIL_RTDVMVOLUME) + { + RTDvmVolumeRelease(pThis->hVol); + pThis->hVol = NIL_RTDVMVOLUME; + } + if (pThis->hVolMgr != NIL_RTDVM) + { + RTDvmRelease(pThis->hVolMgr); + pThis->hVolMgr = NIL_RTDVM; + } + return VINF_SUCCESS; +} + + +/** + * Worker for rtDvmVfsSym_QueryInfo and rtDvmVfsDir_Read. + * + * @returns IPRT status code. + * @param hVolume The volume handle. + * @param hVolMgr The volume manager handle. Optional. + * @param pszTarget The link target. + * @param pObjInfo The object info structure to populate. + * @param enmAddAttr The additional attributes to supply. + */ +static int rtDvmVfsSym_QueryInfoWorker(RTDVMVOLUME hVolume, RTDVM hVolMgr, const char *pszTarget, + PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr) +{ + RT_ZERO(*pObjInfo); + pObjInfo->cbObject = pObjInfo->cbAllocated = pszTarget ? strlen(pszTarget) : 0; + pObjInfo->Attr.fMode = 0777 | RTFS_TYPE_SYMLINK | RTFS_DOS_NT_REPARSE_POINT; + + return rtDvmVfsFileSym_QueryAddAttrWorker(hVolume, hVolMgr, pObjInfo, enmAddAttr); +} + + +/** + * @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo} + */ +static DECLCALLBACK(int) rtDvmVfsSym_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr) +{ + PRTVFSDVMSYMLINK pThis = (PRTVFSDVMSYMLINK)pvThis; + return rtDvmVfsSym_QueryInfoWorker(pThis->hVol, pThis->hVolMgr, pThis->szTarget, pObjInfo, enmAddAttr); +} + + +/** + * @interface_method_impl{RTVFSSYMLINKOPS,pfnRead} + */ +static DECLCALLBACK(int) rtDvmVfsSym_Read(void *pvThis, char *pszTarget, size_t cbTarget) +{ + PRTVFSDVMSYMLINK pThis = (PRTVFSDVMSYMLINK)pvThis; + return RTStrCopy(pszTarget, cbTarget, pThis->szTarget); +} + + +/** + * DVM symbolic link operations. + */ +static const RTVFSSYMLINKOPS g_rtDvmVfsSymOps = +{ + { /* Obj */ + RTVFSOBJOPS_VERSION, + RTVFSOBJTYPE_SYMLINK, + "DvmSymlink", + rtDvmVfsSym_Close, + rtDvmVfsSym_QueryInfo, + RTVFSOBJOPS_VERSION + }, + RTVFSSYMLINKOPS_VERSION, + 0, + { /* ObjSet */ + RTVFSOBJSETOPS_VERSION, + RT_UOFFSETOF(RTVFSSYMLINKOPS, ObjSet) - RT_UOFFSETOF(RTVFSSYMLINKOPS, Obj), + NULL /*rtDvmVfsSym_SetMode*/, + NULL /*rtDvmVfsSym_SetTimes*/, + NULL /*rtDvmVfsSym_SetOwner*/, + RTVFSOBJSETOPS_VERSION + }, + rtDvmVfsSym_Read, + RTVFSSYMLINKOPS_VERSION +}; + + +/** + * Internal worker for rtDvmVfsDir_OpenFile. + * + * @returns IPRT status code. + * @param hVol The volume handle (not consumed). + * @param hVolMgr The volume manager handle (not consumed). + * @param iVol The volume number. + * @param pszSymlink The volume name. Consumed on success. + * @param phVfsSymlinkOut Where to return the handle to the file. + */ +static int rtDvmVfsCreateSymlinkForVolume(RTDVMVOLUME hVol, RTDVM hVolMgr, uint32_t iVol, char *pszSymlink, + PRTVFSSYMLINK phVfsSymlinkOut) +{ + uint32_t cRefs = RTDvmVolumeRetain(hVol); + AssertReturn(cRefs != UINT32_MAX, VERR_INVALID_HANDLE); + + cRefs = RTDvmRetain(hVolMgr); + AssertReturnStmt(cRefs != UINT32_MAX, RTDvmVolumeRelease(hVol), VERR_INVALID_HANDLE); + + /* + * Create the symlink. + */ + RTVFSSYMLINK hVfsSym; + PRTVFSDVMSYMLINK pThis; + int rc = RTVfsNewSymlink(&g_rtDvmVfsSymOps, sizeof(*pThis), NIL_RTVFS, NIL_RTVFSLOCK, &hVfsSym, (void **)&pThis); + if (RT_SUCCESS(rc)) + { + pThis->hVol = hVol; + pThis->hVolMgr = hVolMgr; + pThis->pszSymlink = pszSymlink; + RTStrPrintf(pThis->szTarget, sizeof(pThis->szTarget), "vol%u", iVol); + + *phVfsSymlinkOut = hVfsSym; + return VINF_SUCCESS; + } + RTDvmRelease(hVolMgr); + RTDvmVolumeRelease(hVol); + return rc; +} + + + +/********************************************************************************************************************************* +* DVM Directory Objects * +*********************************************************************************************************************************/ + +/** + * @interface_method_impl{RTVFSOBJOPS,pfnClose} + */ +static DECLCALLBACK(int) rtDvmVfsDir_Close(void *pvThis) +{ + PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis; + + if (pThis->hCurVolume != NIL_RTDVMVOLUME) + { + RTDvmVolumeRelease(pThis->hCurVolume); + pThis->hCurVolume = NIL_RTDVMVOLUME; + } + + if (pThis->pszNameAlias) + { + RTStrFree(pThis->pszNameAlias); + pThis->pszNameAlias = NULL; + } + + pThis->pVfsVol = NULL; + + return VINF_SUCCESS; +} + + +/** + * @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo} + */ +static DECLCALLBACK(int) rtDvmVfsDir_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr) +{ + PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis; + pObjInfo->cbObject = pThis->pVfsVol->cVolumes; + pObjInfo->cbAllocated = pThis->pVfsVol->cVolumes; + RTTimeSpecSetNano(&pObjInfo->AccessTime, 0); + RTTimeSpecSetNano(&pObjInfo->ModificationTime, 0); + RTTimeSpecSetNano(&pObjInfo->ChangeTime, 0); + RTTimeSpecSetNano(&pObjInfo->BirthTime, 0); + pObjInfo->Attr.fMode = RTFS_TYPE_DIRECTORY | RTFS_DOS_DIRECTORY; + if (pThis->pVfsVol->fReadOnly) + pObjInfo->Attr.fMode |= RTFS_DOS_READONLY | 0555; + else + pObjInfo->Attr.fMode |= 0777; + + switch (enmAddAttr) + { + case RTFSOBJATTRADD_NOTHING: + case RTFSOBJATTRADD_UNIX: + pObjInfo->Attr.u.Unix.uid = NIL_RTUID; + pObjInfo->Attr.u.Unix.gid = (RTGID)RTDvmMapGetFormatType(pThis->pVfsVol->hVolMgr); + pObjInfo->Attr.u.Unix.cHardlinks = pThis->pVfsVol->cVolumes; + pObjInfo->Attr.u.Unix.INodeIdDevice = 0; + pObjInfo->Attr.u.Unix.INodeId = 0; + pObjInfo->Attr.u.Unix.fFlags = 0; + pObjInfo->Attr.u.Unix.GenerationId = 0; + pObjInfo->Attr.u.Unix.Device = 0; + break; + + case RTFSOBJATTRADD_UNIX_OWNER: + pObjInfo->Attr.u.UnixOwner.uid = NIL_RTUID; + pObjInfo->Attr.u.UnixOwner.szName[0] = '\0'; + break; + + case RTFSOBJATTRADD_UNIX_GROUP: + pObjInfo->Attr.u.UnixGroup.gid = (RTGID)RTDvmMapGetFormatType(pThis->pVfsVol->hVolMgr); + RTStrCopy(pObjInfo->Attr.u.UnixGroup.szName, sizeof(pObjInfo->Attr.u.UnixGroup.szName), + RTDvmMapGetFormatName(pThis->pVfsVol->hVolMgr)); + break; + + case RTFSOBJATTRADD_EASIZE: + pObjInfo->Attr.u.EASize.cb = 0; + break; + + default: + return VERR_INVALID_PARAMETER; + } + return VINF_SUCCESS; +} + + +/** + * @interface_method_impl{RTVFSOBJSETOPS,pfnMode} + */ +static DECLCALLBACK(int) rtDvmVfsDir_SetMode(void *pvThis, RTFMODE fMode, RTFMODE fMask) +{ + NOREF(pvThis); NOREF(fMode); NOREF(fMask); + return VERR_NOT_SUPPORTED; +} + + +/** + * @interface_method_impl{RTVFSOBJSETOPS,pfnSetTimes} + */ +static DECLCALLBACK(int) rtDvmVfsDir_SetTimes(void *pvThis, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime, + PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime) +{ + NOREF(pvThis); NOREF(pAccessTime); NOREF(pModificationTime); NOREF(pChangeTime); NOREF(pBirthTime); + return VERR_NOT_SUPPORTED; +} + + +/** + * @interface_method_impl{RTVFSOBJSETOPS,pfnSetOwner} + */ +static DECLCALLBACK(int) rtDvmVfsDir_SetOwner(void *pvThis, RTUID uid, RTGID gid) +{ + RT_NOREF(pvThis, uid, gid); + return VERR_NOT_SUPPORTED; +} + + +static int rtDvmVfsDir_FindEntry(PRTDVMVFSDIR pThis, const char *pszEntry, + PRTDVMVOLUME phVolume, uint32_t *piVol, char **ppszSymlink) +{ + *phVolume = NIL_RTDVMVOLUME; + *ppszSymlink = NULL; + *piVol = UINT32_MAX; + + /* + * Enumerate the volumes and try match the volume name. + */ + int rc; + PRTDVMVFSVOL pVfsVol = pThis->pVfsVol; + if (pVfsVol->cVolumes > 0) + { + /* The first volume. */ + uint32_t iVol = 0; + RTDVMVOLUME hVol; + rc = RTDvmMapQueryFirstVolume(pThis->pVfsVol->hVolMgr, &hVol); + while (RT_SUCCESS(rc)) + { + /* Match the name. */ + bool fMatch; + char *pszVolName; + rc = RTDvmVolumeQueryName(hVol, &pszVolName); + if (RT_SUCCESS(rc)) + { + fMatch = RTStrCmp(pszEntry, pszVolName) == 0 && *pszVolName != '\0'; + if (fMatch) + { + *phVolume = hVol; + *ppszSymlink = pszVolName; + *piVol = iVol; + return VINF_SUCCESS; + } + RTStrFree(pszVolName); + } + else if (rc == VERR_NOT_SUPPORTED) + fMatch = false; + else + { + RTDvmVolumeRelease(hVol); + break; + } + + /* Match the sequential volume number. */ + if (!fMatch) + { + char szTmp[16]; + RTStrPrintf(szTmp, sizeof(szTmp), "vol%u", iVol); + fMatch = RTStrCmp(pszEntry, szTmp) == 0; + } + + if (fMatch) + { + *phVolume = hVol; + *piVol = iVol; + return VINF_SUCCESS; + } + + /* More volumes? */ + iVol++; + if (iVol >= pVfsVol->cVolumes) + { + RTDvmVolumeRelease(hVol); + rc = VERR_FILE_NOT_FOUND; + break; + } + + /* Get the next volume. */ + RTDVMVOLUME hVolNext; + rc = RTDvmMapQueryNextVolume(pThis->pVfsVol->hVolMgr, hVol, &hVolNext); + RTDvmVolumeRelease(hVol); + hVol = hVolNext; + } + } + else + rc = VERR_FILE_NOT_FOUND; + return rc; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnOpen} + */ +static DECLCALLBACK(int) rtDvmVfsDir_Open(void *pvThis, const char *pszEntry, uint64_t fOpen, uint32_t fFlags, PRTVFSOBJ phVfsObj) +{ + PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis; + + /* + * Special case: '.' and '..' + */ + if ( pszEntry[0] == '.' + && ( pszEntry[1] == '\0' + || ( pszEntry[1] == '.' + && pszEntry[2] == '\0'))) + { + if ( (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN + || (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN_CREATE + || (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_CREATE_REPLACE) + { + if (fFlags & RTVFSOBJ_F_OPEN_DIRECTORY) + { + RTVFSDIR hVfsDir; + int rc = rtDvmVfsVol_OpenRoot(pThis->pVfsVol, &hVfsDir); + if (RT_SUCCESS(rc)) + { + *phVfsObj = RTVfsObjFromDir(hVfsDir); + RTVfsDirRelease(hVfsDir); + AssertStmt(*phVfsObj != NIL_RTVFSOBJ, rc = VERR_INTERNAL_ERROR_3); + } + return rc; + } + return VERR_IS_A_DIRECTORY; + } + return VERR_ACCESS_DENIED; + } + + /* + * Open volume file. + */ + RTDVMVOLUME hVolume = NIL_RTDVMVOLUME; + uint32_t iVol = 0; + char *pszSymlink = NULL; + int rc = rtDvmVfsDir_FindEntry(pThis, pszEntry, &hVolume, &iVol, &pszSymlink); + if (RT_SUCCESS(rc)) + { + if ( (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN + || (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_OPEN_CREATE + || (fOpen & RTFILE_O_ACTION_MASK) == RTFILE_O_CREATE_REPLACE) + { + if (fFlags & (RTVFSOBJ_F_OPEN_FILE | RTVFSOBJ_F_OPEN_DEV_BLOCK)) + { + if (!pszSymlink) + { + if ( !(fOpen & RTFILE_O_WRITE) + || !pThis->pVfsVol->fReadOnly) + { + /* Create file object. */ + RTVFSFILE hVfsFile; + rc = rtDvmVfsCreateFileForVolume(pThis->pVfsVol, hVolume, fOpen, &hVfsFile); + if (RT_SUCCESS(rc)) + { + *phVfsObj = RTVfsObjFromFile(hVfsFile); + RTVfsFileRelease(hVfsFile); + AssertStmt(*phVfsObj != NIL_RTVFSOBJ, rc = VERR_INTERNAL_ERROR_3); + } + } + else + rc = VERR_WRITE_PROTECT; + } + else + rc = VERR_IS_A_SYMLINK; + } + else if (fFlags & RTVFSOBJ_F_OPEN_SYMLINK) + { + /* Create symlink object */ + RTVFSSYMLINK hVfsSym = NIL_RTVFSSYMLINK; /* (older gcc maybe used uninitialized) */ + rc = rtDvmVfsCreateSymlinkForVolume(hVolume, pThis->pVfsVol ? pThis->pVfsVol->hVolMgr : NIL_RTDVM, iVol, + pszSymlink, &hVfsSym); + if (RT_SUCCESS(rc)) + { + *phVfsObj = RTVfsObjFromSymlink(hVfsSym); + RTVfsSymlinkRelease(hVfsSym); + AssertStmt(*phVfsObj != NIL_RTVFSOBJ, rc = VERR_INTERNAL_ERROR_3); + pszSymlink = NULL; + } + } + else + rc = VERR_IS_A_FILE; + } + else + rc = VERR_ALREADY_EXISTS; + RTDvmVolumeRelease(hVolume); + if (pszSymlink) + RTStrFree(pszSymlink); + } + return rc; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnOpenFile} + */ +static DECLCALLBACK(int) rtDvmVfsDir_OpenFile(void *pvThis, const char *pszFilename, uint64_t fOpen, PRTVFSFILE phVfsFile) +{ + RTVFSOBJ hVfsObj; + int rc = rtDvmVfsDir_Open(pvThis, pszFilename, fOpen, RTVFSOBJ_F_OPEN_FILE, &hVfsObj); + if (RT_SUCCESS(rc)) + { + *phVfsFile = RTVfsObjToFile(hVfsObj); + RTVfsObjRelease(hVfsObj); + } + return rc; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnCreateDir} + */ +static DECLCALLBACK(int) rtDvmVfsDir_CreateDir(void *pvThis, const char *pszSubDir, RTFMODE fMode, PRTVFSDIR phVfsDir) +{ + RT_NOREF(pvThis, pszSubDir, fMode, phVfsDir); + return VERR_NOT_SUPPORTED; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnOpenSymlink} + */ +static DECLCALLBACK(int) rtDvmVfsDir_OpenSymlink(void *pvThis, const char *pszSymlink, PRTVFSSYMLINK phVfsSymlink) +{ + RT_NOREF(pvThis, pszSymlink, phVfsSymlink); + return VERR_NOT_SUPPORTED; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnCreateSymlink} + */ +static DECLCALLBACK(int) rtDvmVfsDir_CreateSymlink(void *pvThis, const char *pszSymlink, const char *pszTarget, + RTSYMLINKTYPE enmType, PRTVFSSYMLINK phVfsSymlink) +{ + RT_NOREF(pvThis, pszSymlink, pszTarget, enmType, phVfsSymlink); + return VERR_NOT_SUPPORTED; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnUnlinkEntry} + */ +static DECLCALLBACK(int) rtDvmVfsDir_UnlinkEntry(void *pvThis, const char *pszEntry, RTFMODE fType) +{ + RT_NOREF(pvThis, pszEntry, fType); + return VERR_NOT_IMPLEMENTED; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnRenameEntry} + */ +static DECLCALLBACK(int) rtDvmVfsDir_RenameEntry(void *pvThis, const char *pszEntry, RTFMODE fType, const char *pszNewName) +{ + RT_NOREF(pvThis, pszEntry, fType, pszNewName); + return VERR_NOT_IMPLEMENTED; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnRewindDir} + */ +static DECLCALLBACK(int) rtDvmVfsDir_RewindDir(void *pvThis) +{ + PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis; + + if (pThis->hCurVolume != NIL_RTDVMVOLUME) + { + RTDvmVolumeRelease(pThis->hCurVolume); + pThis->hCurVolume = NIL_RTDVMVOLUME; + } + pThis->fReturnCurrent = false; + pThis->offDir = 0; + if (pThis->pszNameAlias) + { + RTStrFree(pThis->pszNameAlias); + pThis->pszNameAlias = NULL; + } + + return VINF_SUCCESS; +} + + +/** + * @interface_method_impl{RTVFSDIROPS,pfnReadDir} + */ +static DECLCALLBACK(int) rtDvmVfsDir_ReadDir(void *pvThis, PRTDIRENTRYEX pDirEntry, size_t *pcbDirEntry, + RTFSOBJATTRADD enmAddAttr) +{ + PRTDVMVFSDIR pThis = (PRTDVMVFSDIR)pvThis; + PRTDVMVFSVOL pVfsVol = pThis->pVfsVol; + int rc; + + /* + * Format the volume name since we'll be needing it all but the final call. + */ + char szVolNo[16]; + size_t const cchVolNo = RTStrPrintf(szVolNo, sizeof(szVolNo), "vol%u", pThis->offDir); + + if (!pThis->fReturnCurrent) + { + /* + * Do we have a pending name alias to return? + */ + if (pThis->pszNameAlias) + { + size_t cchNameAlias = strlen(pThis->pszNameAlias); + size_t cbNeeded = RT_UOFFSETOF_DYN(RTDIRENTRYEX, szName[cchNameAlias + 1]); + if (cbNeeded <= *pcbDirEntry) + { + *pcbDirEntry = cbNeeded; + + /* Do the names. */ + pDirEntry->cbName = (uint16_t)cchNameAlias; + memcpy(pDirEntry->szName, pThis->pszNameAlias, cchNameAlias + 1); + pDirEntry->cwcShortName = 0; + pDirEntry->wszShortName[0] = '\0'; + + + /* Do the rest. */ + rc = rtDvmVfsSym_QueryInfoWorker(pThis->hCurVolume, pVfsVol->hVolMgr, szVolNo, &pDirEntry->Info, enmAddAttr); + if (RT_SUCCESS(rc)) + { + RTStrFree(pThis->pszNameAlias); + pThis->pszNameAlias = NULL; + pThis->offDir += 1; + } + return rc; + } + + *pcbDirEntry = cbNeeded; + return VERR_BUFFER_OVERFLOW; + } + + /* + * Get the next volume to return info about. + */ + if (pThis->offDir < pVfsVol->cVolumes) + { + RTDVMVOLUME hNextVolume; + if (pThis->offDir == 0) + rc = RTDvmMapQueryFirstVolume(pVfsVol->hVolMgr, &hNextVolume); + else + rc = RTDvmMapQueryNextVolume(pVfsVol->hVolMgr, pThis->hCurVolume, &hNextVolume); + if (RT_FAILURE(rc)) + return rc; + RTDvmVolumeRelease(pThis->hCurVolume); + pThis->hCurVolume = hNextVolume; + + /* Check if we need to return a name alias later. */ + rc = RTDvmVolumeQueryName(pThis->hCurVolume, &pThis->pszNameAlias); + if (RT_FAILURE(rc)) + pThis->pszNameAlias = NULL; + else if (*pThis->pszNameAlias == '\0') + { + RTStrFree(pThis->pszNameAlias); + pThis->pszNameAlias = NULL; + } + } + else + { + RTDvmVolumeRelease(pThis->hCurVolume); + pThis->hCurVolume = NIL_RTDVMVOLUME; + return VERR_NO_MORE_FILES; + } + } + + /* + * Figure out the name length. + */ + size_t cbNeeded = RT_UOFFSETOF_DYN(RTDIRENTRYEX, szName[cchVolNo + 1]); + if (cbNeeded <= *pcbDirEntry) + { + *pcbDirEntry = cbNeeded; + + /* Do the names. */ + pDirEntry->cbName = (uint16_t)cchVolNo; + memcpy(pDirEntry->szName, szVolNo, cchVolNo + 1); + pDirEntry->cwcShortName = 0; + pDirEntry->wszShortName[0] = '\0'; + + /* Do the rest. */ + rc = rtDvmVfsFile_QueryInfoWorker(pThis->hCurVolume, pVfsVol->hVolMgr, pVfsVol->fReadOnly, &pDirEntry->Info, enmAddAttr); + if (RT_SUCCESS(rc)) + { + pThis->fReturnCurrent = false; + if (!pThis->pszNameAlias) + pThis->offDir += 1; + return rc; + } + } + else + { + *pcbDirEntry = cbNeeded; + rc = VERR_BUFFER_OVERFLOW; + } + pThis->fReturnCurrent = true; + return rc; +} + + +/** + * DVM (root) directory operations. + */ +static const RTVFSDIROPS g_rtDvmVfsDirOps = +{ + { /* Obj */ + RTVFSOBJOPS_VERSION, + RTVFSOBJTYPE_DIR, + "DvmDir", + rtDvmVfsDir_Close, + rtDvmVfsDir_QueryInfo, + RTVFSOBJOPS_VERSION + }, + RTVFSDIROPS_VERSION, + 0, + { /* ObjSet */ + RTVFSOBJSETOPS_VERSION, + RT_UOFFSETOF(RTVFSDIROPS, ObjSet) - RT_UOFFSETOF(RTVFSDIROPS, Obj), + rtDvmVfsDir_SetMode, + rtDvmVfsDir_SetTimes, + rtDvmVfsDir_SetOwner, + RTVFSOBJSETOPS_VERSION + }, + rtDvmVfsDir_Open, + NULL /* pfnFollowAbsoluteSymlink */, + rtDvmVfsDir_OpenFile, + NULL /* pfnOpenDir */, + rtDvmVfsDir_CreateDir, + rtDvmVfsDir_OpenSymlink, + rtDvmVfsDir_CreateSymlink, + NULL /* pfnQueryEntryInfo */, + rtDvmVfsDir_UnlinkEntry, + rtDvmVfsDir_RenameEntry, + rtDvmVfsDir_RewindDir, + rtDvmVfsDir_ReadDir, + RTVFSDIROPS_VERSION, +}; + + + +/** + * @interface_method_impl{RTVFSOBJOPS::Obj,pfnClose} + */ +static DECLCALLBACK(int) rtDvmVfsVol_Close(void *pvThis) +{ + PRTDVMVFSVOL pThis = (PRTDVMVFSVOL)pvThis; + LogFlow(("rtDvmVfsVol_Close(%p)\n", pThis)); + + if ( pThis->fCloseDvm + && pThis->hVolMgr != NIL_RTDVM ) + RTDvmRelease(pThis->hVolMgr); + pThis->hVolMgr = NIL_RTDVM; + + return VINF_SUCCESS; +} + + +/** + * @interface_method_impl{RTVFSOBJOPS::Obj,pfnQueryInfo} + */ +static DECLCALLBACK(int) rtDvmVfsVol_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr) +{ + RT_NOREF(pvThis, pObjInfo, enmAddAttr); + return VERR_WRONG_TYPE; +} + + +/** + * @interface_method_impl{RTVFSOPS,pfnOpenRoot} + */ +static DECLCALLBACK(int) rtDvmVfsVol_OpenRoot(void *pvThis, PRTVFSDIR phVfsDir) +{ + PRTDVMVFSVOL pThis = (PRTDVMVFSVOL)pvThis; + + PRTDVMVFSDIR pNewDir; + int rc = RTVfsNewDir(&g_rtDvmVfsDirOps, sizeof(*pNewDir), 0 /*fFlags*/, pThis->hVfsSelf, + NIL_RTVFSLOCK /*use volume lock*/, phVfsDir, (void **)&pNewDir); + if (RT_SUCCESS(rc)) + { + pNewDir->offDir = 0; + pNewDir->pVfsVol = pThis; + pNewDir->fReturnCurrent = false; + pNewDir->pszNameAlias = NULL; + pNewDir->hCurVolume = NIL_RTDVMVOLUME; + } + return rc; +} + + +/** + * @interface_method_impl{RTVFSOPS,pfnQueryRangeState} + */ +static DECLCALLBACK(int) rtDvmVfsVol_QueryRangeState(void *pvThis, uint64_t off, size_t cb, bool *pfUsed) +{ + RT_NOREF(pvThis, off, cb, pfUsed); + return VERR_NOT_IMPLEMENTED; +} + + +DECL_HIDDEN_CONST(const RTVFSOPS) g_rtDvmVfsVolOps = +{ + { /* Obj */ + RTVFSOBJOPS_VERSION, + RTVFSOBJTYPE_VFS, + "DvmVol", + rtDvmVfsVol_Close, + rtDvmVfsVol_QueryInfo, + RTVFSOBJOPS_VERSION + }, + RTVFSOPS_VERSION, + 0 /* fFeatures */, + rtDvmVfsVol_OpenRoot, + rtDvmVfsVol_QueryRangeState, + RTVFSOPS_VERSION +}; + + + +/** + * @interface_method_impl{RTVFSCHAINELEMENTREG,pfnValidate} + */ +static DECLCALLBACK(int) rtDvmVfsChain_Validate(PCRTVFSCHAINELEMENTREG pProviderReg, PRTVFSCHAINSPEC pSpec, + PRTVFSCHAINELEMSPEC pElement, uint32_t *poffError, PRTERRINFO pErrInfo) +{ + RT_NOREF(pProviderReg, pSpec); + + /* + * Basic checks. + */ + if (pElement->enmTypeIn != RTVFSOBJTYPE_FILE) + return pElement->enmTypeIn == RTVFSOBJTYPE_INVALID ? VERR_VFS_CHAIN_CANNOT_BE_FIRST_ELEMENT : VERR_VFS_CHAIN_TAKES_FILE; + if (pElement->enmType != RTVFSOBJTYPE_VFS) + return VERR_VFS_CHAIN_ONLY_VFS; + + if (pElement->cArgs > 1) + return VERR_VFS_CHAIN_AT_MOST_ONE_ARG; + + /* + * Parse the flag if present, save in pElement->uProvider. + */ + /** @todo allow specifying sector size */ + bool fReadOnly = (pSpec->fOpenFile & RTFILE_O_ACCESS_MASK) == RTFILE_O_READ; + if (pElement->cArgs > 0) + { + const char *psz = pElement->paArgs[0].psz; + if (*psz) + { + if ( !strcmp(psz, "ro") + || !strcmp(psz, "r")) + fReadOnly = true; + else if (!strcmp(psz, "rw")) + fReadOnly = false; + else + { + *poffError = pElement->paArgs[0].offSpec; + return RTErrInfoSet(pErrInfo, VERR_VFS_CHAIN_INVALID_ARGUMENT, "Expected 'ro' or 'rw' as argument"); + } + } + } + + pElement->uProvider = fReadOnly; + return VINF_SUCCESS; +} + + +/** + * @interface_method_impl{RTVFSCHAINELEMENTREG,pfnInstantiate} + */ +static DECLCALLBACK(int) rtDvmVfsChain_Instantiate(PCRTVFSCHAINELEMENTREG pProviderReg, PCRTVFSCHAINSPEC pSpec, + PCRTVFSCHAINELEMSPEC pElement, RTVFSOBJ hPrevVfsObj, + PRTVFSOBJ phVfsObj, uint32_t *poffError, PRTERRINFO pErrInfo) +{ + RT_NOREF(pProviderReg, pSpec, poffError, pErrInfo); + AssertReturn(hPrevVfsObj != NIL_RTVFSOBJ, VERR_VFS_CHAIN_IPE); + + /* + * Instantiate the volume manager and open the map stuff. + */ + RTVFSFILE hPrevVfsFile = RTVfsObjToFile(hPrevVfsObj); + AssertReturn(hPrevVfsFile != NIL_RTVFSFILE, VERR_VFS_CHAIN_CAST_FAILED); + + RTDVM hVolMgr; + int rc = RTDvmCreate(&hVolMgr, hPrevVfsFile, 512, 0 /*fFlags*/); + RTVfsFileRelease(hPrevVfsFile); + if (RT_SUCCESS(rc)) + { + rc = RTDvmMapOpen(hVolMgr); + if (RT_SUCCESS(rc)) + { + /* + * Create a VFS instance for the volume manager. + */ + RTVFS hVfs = NIL_RTVFS; + PRTDVMVFSVOL pThis = NULL; + rc = RTVfsNew(&g_rtDvmVfsVolOps, sizeof(RTDVMVFSVOL), NIL_RTVFS, RTVFSLOCK_CREATE_RW, &hVfs, (void **)&pThis); + if (RT_SUCCESS(rc)) + { + pThis->hVolMgr = hVolMgr; + pThis->fCloseDvm = true; + pThis->fReadOnly = pElement->uProvider == (uint64_t)true; + pThis->cVolumes = RTDvmMapGetValidVolumes(hVolMgr); + pThis->hVfsSelf = hVfs; + + *phVfsObj = RTVfsObjFromVfs(hVfs); + RTVfsRelease(hVfs); + return *phVfsObj != NIL_RTVFSOBJ ? VINF_SUCCESS : VERR_VFS_CHAIN_CAST_FAILED; + } + } + else + rc = RTErrInfoSetF(pErrInfo, rc, "RTDvmMapOpen failed: %Rrc", rc); + RTDvmRelease(hVolMgr); + } + else + rc = RTErrInfoSetF(pErrInfo, rc, "RTDvmCreate failed: %Rrc", rc); + return rc; +} + + +/** + * @interface_method_impl{RTVFSCHAINELEMENTREG,pfnCanReuseElement} + */ +static DECLCALLBACK(bool) rtDvmVfsChain_CanReuseElement(PCRTVFSCHAINELEMENTREG pProviderReg, + PCRTVFSCHAINSPEC pSpec, PCRTVFSCHAINELEMSPEC pElement, + PCRTVFSCHAINSPEC pReuseSpec, PCRTVFSCHAINELEMSPEC pReuseElement) +{ + RT_NOREF(pProviderReg, pSpec, pElement, pReuseSpec, pReuseElement); + return false; +} + + +/** VFS chain element 'file'. */ +static RTVFSCHAINELEMENTREG g_rtVfsChainIsoFsVolReg = +{ + /* uVersion = */ RTVFSCHAINELEMENTREG_VERSION, + /* fReserved = */ 0, + /* pszName = */ "dvm", + /* ListEntry = */ { NULL, NULL }, + /* pszHelp = */ "Opens a container image using the VD API.\n" + "Optionally takes one parameter 'ro' (read only) or 'rw' (read write).\n", + /* pfnValidate = */ rtDvmVfsChain_Validate, + /* pfnInstantiate = */ rtDvmVfsChain_Instantiate, + /* pfnCanReuseElement = */ rtDvmVfsChain_CanReuseElement, + /* uEndMarker = */ RTVFSCHAINELEMENTREG_VERSION +}; + +RTVFSCHAIN_AUTO_REGISTER_ELEMENT_PROVIDER(&g_rtVfsChainIsoFsVolReg, rtVfsChainIsoFsVolReg); + |