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winfsp/tst/memfs/memfs.cpp
Bill Zissimopoulos 09ab9de32c tst: memfs: MemfsUpperChar 
Bit-twiddling upper case char
2022-05-30 17:08:36 +01:00

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/**
* @file memfs.cpp
*
* @copyright 2015-2022 Bill Zissimopoulos
*/
/*
* This file is part of WinFsp.
*
* You can redistribute it and/or modify it under the terms of the GNU
* General Public License version 3 as published by the Free Software
* Foundation.
*
* Licensees holding a valid commercial license may use this software
* in accordance with the commercial license agreement provided in
* conjunction with the software. The terms and conditions of any such
* commercial license agreement shall govern, supersede, and render
* ineffective any application of the GPLv3 license to this software,
* notwithstanding of any reference thereto in the software or
* associated repository.
*/
#undef _DEBUG
#include "memfs.h"
#include <sddl.h>
#include <VersionHelpers.h>
#include <cassert>
#include <map>
#include <unordered_map>
/* SLOWIO */
#include <thread>
#define MEMFS_MAX_PATH 512
FSP_FSCTL_STATIC_ASSERT(MEMFS_MAX_PATH > MAX_PATH,
"MEMFS_MAX_PATH must be greater than MAX_PATH.");
/*
* Define the MEMFS_STANDALONE macro when building MEMFS as a standalone file system.
* This macro should be defined in the Visual Studio project settings, Makefile, etc.
*/
//#define MEMFS_STANDALONE
/*
* Define the MEMFS_NAME_NORMALIZATION macro to include name normalization support.
*/
#define MEMFS_NAME_NORMALIZATION
/*
* Define the MEMFS_REPARSE_POINTS macro to include reparse points support.
*/
#define MEMFS_REPARSE_POINTS
/*
* Define the MEMFS_NAMED_STREAMS macro to include named streams support.
*/
#define MEMFS_NAMED_STREAMS
/*
* Define the MEMFS_DIRINFO_BY_NAME macro to include GetDirInfoByName.
*/
#define MEMFS_DIRINFO_BY_NAME
/*
* Define the MEMFS_SLOWIO macro to include delayed I/O response support.
*/
#define MEMFS_SLOWIO
/*
* Define the MEMFS_CONTROL macro to include DeviceControl support.
*/
#define MEMFS_CONTROL
/*
* Define the MEMFS_EA macro to include extended attributes support.
*/
#define MEMFS_EA
/*
* Define the MEMFS_WSL macro to include WSLinux support.
*/
#define MEMFS_WSL
/*
* Define the MEMFS_REJECT_EARLY_IRP macro to reject IRP's sent
* to the file system prior to the dispatcher being started.
*/
#if defined(MEMFS_STANDALONE)
#define MEMFS_REJECT_EARLY_IRP
#endif
/*
* Define the DEBUG_BUFFER_CHECK macro on Windows 8 or above. This includes
* a check for the Write buffer to ensure that it is read-only.
*
* Since ProcessBuffer support in the FSD, this is no longer a guarantee.
*/
#if !defined(NDEBUG)
//#define DEBUG_BUFFER_CHECK
#endif
#define MEMFS_SECTOR_SIZE 512
#define MEMFS_SECTORS_PER_ALLOCATION_UNIT 1
/*
* Large Heap Support
*/
typedef struct
{
DWORD Options;
SIZE_T InitialSize;
SIZE_T MaximumSize;
SIZE_T Alignment;
} LARGE_HEAP_INITIALIZE_PARAMS;
static INIT_ONCE LargeHeapInitOnce = INIT_ONCE_STATIC_INIT;
static HANDLE LargeHeap;
static SIZE_T LargeHeapAlignment;
static BOOL WINAPI LargeHeapInitOnceF(
PINIT_ONCE InitOnce, PVOID Parameter, PVOID *Context)
{
LARGE_HEAP_INITIALIZE_PARAMS *Params = (LARGE_HEAP_INITIALIZE_PARAMS *)Parameter;
LargeHeap = HeapCreate(Params->Options, Params->InitialSize, Params->MaximumSize);
LargeHeapAlignment = 0 != Params->Alignment ?
FSP_FSCTL_ALIGN_UP(Params->Alignment, 4096) :
16 * 4096;
return TRUE;
}
static inline
BOOLEAN LargeHeapInitialize(
DWORD Options,
SIZE_T InitialSize,
SIZE_T MaximumSize,
SIZE_T Alignment)
{
LARGE_HEAP_INITIALIZE_PARAMS Params;
Params.Options = Options;
Params.InitialSize = InitialSize;
Params.MaximumSize = MaximumSize;
Params.Alignment = Alignment;
InitOnceExecuteOnce(&LargeHeapInitOnce, LargeHeapInitOnceF, &Params, 0);
return 0 != LargeHeap;
}
static inline
PVOID LargeHeapAlloc(SIZE_T Size)
{
return HeapAlloc(LargeHeap, 0, FSP_FSCTL_ALIGN_UP(Size, LargeHeapAlignment));
}
static inline
PVOID LargeHeapRealloc(PVOID Pointer, SIZE_T Size)
{
if (0 != Pointer)
{
if (0 != Size)
return HeapReAlloc(LargeHeap, 0, Pointer, FSP_FSCTL_ALIGN_UP(Size, LargeHeapAlignment));
else
return HeapFree(LargeHeap, 0, Pointer), 0;
}
else
{
if (0 != Size)
return HeapAlloc(LargeHeap, 0, FSP_FSCTL_ALIGN_UP(Size, LargeHeapAlignment));
else
return 0;
}
}
static inline
VOID LargeHeapFree(PVOID Pointer)
{
if (0 != Pointer)
HeapFree(LargeHeap, 0, Pointer);
}
/*
* MEMFS
*/
static inline
UINT64 MemfsGetSystemTime(VOID)
{
FILETIME FileTime;
GetSystemTimeAsFileTime(&FileTime);
return ((PLARGE_INTEGER)&FileTime)->QuadPart;
}
static inline
unsigned MemfsUpperChar(unsigned c)
{
/*
* Bit-twiddling upper case char:
*
* - Let signbit(x) = x & 0x100 (treat bit 0x100 as "signbit").
* - 'A' <= c && c <= 'Z' <=> s = signbit(c - 'A') ^ signbit(c - ('Z' + 1)) == 1
* - c >= 'A' <=> c - 'A' >= 0 <=> signbit(c - 'A') = 0
* - c <= 'Z' <=> c - ('Z' + 1) < 0 <=> signbit(c - ('Z' + 1)) = 1
* - Bit 0x20 = 0x100 >> 3 toggles uppercase to lowercase and vice-versa.
*
* This is actually faster than `(c - 'a' <= 'z' - 'a') ? (c & ~0x20) : c`, even
* when compiled using cmov conditional moves at least on this system (i7-1065G7).
*
* See https://godbolt.org/z/ebv131Wrh
*/
unsigned s = ((c - 'a') ^ (c - ('z' + 1))) & 0x100;
return c & ~(s >> 3);
}
static inline
int MemfsWcsnicmp(const wchar_t *s0, const wchar_t *t0, int n)
{
/* Use fast loop for ASCII and fall back to CompareStringW for general case. */
const wchar_t *s = s0;
const wchar_t *t = t0;
int v = 0;
for (const void *e = t + n; e > (const void *)t; ++s, ++t)
{
unsigned sc = *s, tc = *t;
if (0xffffff80 & (sc | tc))
{
v = CompareStringW(LOCALE_INVARIANT, NORM_IGNORECASE, s0, n, t0, n);
if (0 != v)
return v - 2;
else
return _wcsnicmp(s, t, n);
}
if (0 != (v = MemfsUpperChar(sc) - MemfsUpperChar(tc)) || !tc)
break;
}
return v;/*(0 < v) - (0 > v);*/
}
static inline
int MemfsFileNameCompare(PWSTR a, int alen, PWSTR b, int blen, BOOLEAN CaseInsensitive)
{
PWSTR p, endp, partp, q, endq, partq;
WCHAR c, d;
int plen, qlen, len, res;
if (-1 == alen)
alen = lstrlenW(a);
if (-1 == blen)
blen = lstrlenW(b);
for (p = a, endp = p + alen, q = b, endq = q + blen; endp > p && endq > q;)
{
c = d = 0;
for (; endp > p && (L':' == *p || L'\\' == *p); p++)
c = *p;
for (; endq > q && (L':' == *q || L'\\' == *q); q++)
d = *q;
if (L':' == c)
c = 1;
else if (L'\\' == c)
c = 2;
if (L':' == d)
d = 1;
else if (L'\\' == d)
d = 2;
res = c - d;
if (0 != res)
return res;
for (partp = p; endp > p && L':' != *p && L'\\' != *p; p++)
;
for (partq = q; endq > q && L':' != *q && L'\\' != *q; q++)
;
plen = (int)(p - partp);
qlen = (int)(q - partq);
len = plen < qlen ? plen : qlen;
if (CaseInsensitive)
res = MemfsWcsnicmp(partp, partq, len);
else
res = wcsncmp(partp, partq, len);
if (0 == res)
res = plen - qlen;
if (0 != res)
return res;
}
return -(endp <= p) + (endq <= q);
}
static inline
BOOLEAN MemfsFileNameHasPrefix(PWSTR a, PWSTR b, BOOLEAN CaseInsensitive)
{
int alen = (int)wcslen(a);
int blen = (int)wcslen(b);
return alen >= blen && 0 == MemfsFileNameCompare(a, blen, b, blen, CaseInsensitive) &&
(alen == blen || (1 == blen && L'\\' == b[0]) ||
#if defined(MEMFS_NAMED_STREAMS)
(L'\\' == a[blen] || L':' == a[blen]));
#else
(L'\\' == a[blen]));
#endif
}
#if defined(MEMFS_EA)
static inline
int MemfsEaNameCompare(PSTR a, PSTR b)
{
/* EA names are always case-insensitive in MEMFS (to be inline with NTFS) */
int res;
res = CompareStringA(LOCALE_INVARIANT, NORM_IGNORECASE, a, -1, b, -1);
if (0 != res)
res -= 2;
else
res = _stricmp(a, b);
return res;
}
struct MEMFS_FILE_NODE_EA_LESS
{
MEMFS_FILE_NODE_EA_LESS()
{
}
bool operator()(PSTR a, PSTR b) const
{
return 0 > MemfsEaNameCompare(a, b);
}
};
typedef std::map<PSTR, FILE_FULL_EA_INFORMATION *, MEMFS_FILE_NODE_EA_LESS> MEMFS_FILE_NODE_EA_MAP;
#endif
typedef struct _MEMFS_FILE_NODE
{
WCHAR FileName[MEMFS_MAX_PATH];
FSP_FSCTL_FILE_INFO FileInfo;
SIZE_T FileSecuritySize;
PVOID FileSecurity;
PVOID FileData;
#if defined(MEMFS_REPARSE_POINTS)
SIZE_T ReparseDataSize;
PVOID ReparseData;
#endif
#if defined(MEMFS_EA)
MEMFS_FILE_NODE_EA_MAP *EaMap;
#endif
volatile LONG RefCount;
#if defined(MEMFS_NAMED_STREAMS)
struct _MEMFS_FILE_NODE *MainFileNode;
#endif
} MEMFS_FILE_NODE;
struct MEMFS_FILE_NODE_LESS
{
MEMFS_FILE_NODE_LESS(BOOLEAN CaseInsensitive) : CaseInsensitive(CaseInsensitive)
{
}
bool operator()(PWSTR a, PWSTR b) const
{
return 0 > MemfsFileNameCompare(a, -1, b, -1, CaseInsensitive);
}
BOOLEAN CaseInsensitive;
};
typedef std::map<PWSTR, MEMFS_FILE_NODE *, MEMFS_FILE_NODE_LESS> MEMFS_FILE_NODE_MAP;
typedef struct _MEMFS
{
FSP_FILE_SYSTEM *FileSystem;
MEMFS_FILE_NODE_MAP *FileNodeMap;
ULONG MaxFileNodes;
ULONG MaxFileSize;
#ifdef MEMFS_SLOWIO
ULONG SlowioMaxDelay;
ULONG SlowioPercentDelay;
ULONG SlowioRarefyDelay;
volatile LONG SlowioThreadsRunning;
#endif
UINT16 VolumeLabelLength;
WCHAR VolumeLabel[32];
} MEMFS;
static inline
NTSTATUS MemfsFileNodeCreate(PWSTR FileName, MEMFS_FILE_NODE **PFileNode)
{
static UINT64 IndexNumber = 1;
MEMFS_FILE_NODE *FileNode;
*PFileNode = 0;
FileNode = (MEMFS_FILE_NODE *)malloc(sizeof *FileNode);
if (0 == FileNode)
return STATUS_INSUFFICIENT_RESOURCES;
memset(FileNode, 0, sizeof *FileNode);
wcscpy_s(FileNode->FileName, sizeof FileNode->FileName / sizeof(WCHAR), FileName);
FileNode->FileInfo.CreationTime =
FileNode->FileInfo.LastAccessTime =
FileNode->FileInfo.LastWriteTime =
FileNode->FileInfo.ChangeTime = MemfsGetSystemTime();
FileNode->FileInfo.IndexNumber = IndexNumber++;
*PFileNode = FileNode;
return STATUS_SUCCESS;
}
#if defined(MEMFS_EA)
static inline
VOID MemfsFileNodeDeleteEaMap(MEMFS_FILE_NODE *FileNode)
{
if (0 != FileNode->EaMap)
{
for (MEMFS_FILE_NODE_EA_MAP::iterator p = FileNode->EaMap->begin(), q = FileNode->EaMap->end();
p != q; ++p)
free(p->second);
delete FileNode->EaMap;
FileNode->EaMap = 0;
FileNode->FileInfo.EaSize = 0;
}
}
#endif
static inline
VOID MemfsFileNodeDelete(MEMFS_FILE_NODE *FileNode)
{
#if defined(MEMFS_EA)
MemfsFileNodeDeleteEaMap(FileNode);
#endif
#if defined(MEMFS_REPARSE_POINTS)
free(FileNode->ReparseData);
#endif
LargeHeapFree(FileNode->FileData);
free(FileNode->FileSecurity);
free(FileNode);
}
static inline
VOID MemfsFileNodeReference(MEMFS_FILE_NODE *FileNode)
{
InterlockedIncrement(&FileNode->RefCount);
}
static inline
VOID MemfsFileNodeDereference(MEMFS_FILE_NODE *FileNode)
{
if (0 == InterlockedDecrement(&FileNode->RefCount))
MemfsFileNodeDelete(FileNode);
}
static inline
VOID MemfsFileNodeGetFileInfo(MEMFS_FILE_NODE *FileNode, FSP_FSCTL_FILE_INFO *FileInfo)
{
#if defined(MEMFS_NAMED_STREAMS)
if (0 == FileNode->MainFileNode)
*FileInfo = FileNode->FileInfo;
else
{
*FileInfo = FileNode->MainFileNode->FileInfo;
FileInfo->FileAttributes &= ~FILE_ATTRIBUTE_DIRECTORY;
/* named streams cannot be directories */
FileInfo->AllocationSize = FileNode->FileInfo.AllocationSize;
FileInfo->FileSize = FileNode->FileInfo.FileSize;
}
#else
*FileInfo = FileNode->FileInfo;
#endif
}
#if defined(MEMFS_EA)
static inline
NTSTATUS MemfsFileNodeGetEaMap(MEMFS_FILE_NODE *FileNode, MEMFS_FILE_NODE_EA_MAP **PEaMap)
{
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
*PEaMap = FileNode->EaMap;
if (0 != *PEaMap)
return STATUS_SUCCESS;
try
{
*PEaMap = FileNode->EaMap = new MEMFS_FILE_NODE_EA_MAP(MEMFS_FILE_NODE_EA_LESS());
return STATUS_SUCCESS;
}
catch (...)
{
*PEaMap = 0;
return STATUS_INSUFFICIENT_RESOURCES;
}
}
static inline
NTSTATUS MemfsFileNodeSetEa(
FSP_FILE_SYSTEM *FileSystem, PVOID Context,
PFILE_FULL_EA_INFORMATION Ea)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)Context;
MEMFS_FILE_NODE_EA_MAP *EaMap;
FILE_FULL_EA_INFORMATION *FileNodeEa = 0;
MEMFS_FILE_NODE_EA_MAP::iterator p;
ULONG EaSizePlus = 0, EaSizeMinus = 0;
NTSTATUS Result;
Result = MemfsFileNodeGetEaMap(FileNode, &EaMap);
if (!NT_SUCCESS(Result))
return Result;
if (0 != Ea->EaValueLength)
{
EaSizePlus = FIELD_OFFSET(FILE_FULL_EA_INFORMATION, EaName) +
Ea->EaNameLength + 1 + Ea->EaValueLength;
FileNodeEa = (FILE_FULL_EA_INFORMATION *)malloc(EaSizePlus);
if (0 == FileNodeEa)
return STATUS_INSUFFICIENT_RESOURCES;
memcpy(FileNodeEa, Ea, EaSizePlus);
FileNodeEa->NextEntryOffset = 0;
EaSizePlus = FspFileSystemGetEaPackedSize(Ea);
}
p = EaMap->find(Ea->EaName);
if (p != EaMap->end())
{
EaSizeMinus = FspFileSystemGetEaPackedSize(Ea);
free(p->second);
EaMap->erase(p);
}
if (0 != Ea->EaValueLength)
{
try
{
EaMap->insert(MEMFS_FILE_NODE_EA_MAP::value_type(FileNodeEa->EaName, FileNodeEa));
}
catch (...)
{
free(FileNodeEa);
return STATUS_INSUFFICIENT_RESOURCES;
}
}
FileNode->FileInfo.EaSize = FileNode->FileInfo.EaSize + EaSizePlus - EaSizeMinus;
return STATUS_SUCCESS;
}
static inline
BOOLEAN MemfsFileNodeNeedEa(MEMFS_FILE_NODE *FileNode)
{
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
if (0 != FileNode->EaMap)
{
for (MEMFS_FILE_NODE_EA_MAP::iterator p = FileNode->EaMap->begin(), q = FileNode->EaMap->end();
p != q; ++p)
if (0 != (p->second->Flags & FILE_NEED_EA))
return TRUE;
}
return FALSE;
}
static inline
BOOLEAN MemfsFileNodeEnumerateEa(MEMFS_FILE_NODE *FileNode,
BOOLEAN (*EnumFn)(PFILE_FULL_EA_INFORMATION Ea, PVOID), PVOID Context)
{
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
if (0 != FileNode->EaMap)
{
for (MEMFS_FILE_NODE_EA_MAP::iterator p = FileNode->EaMap->begin(), q = FileNode->EaMap->end();
p != q; ++p)
if (!EnumFn(p->second, Context))
return FALSE;
}
return TRUE;
}
#endif
static inline
VOID MemfsFileNodeMapDump(MEMFS_FILE_NODE_MAP *FileNodeMap)
{
for (MEMFS_FILE_NODE_MAP::iterator p = FileNodeMap->begin(), q = FileNodeMap->end(); p != q; ++p)
FspDebugLog("%c %04lx %6lu %S\n",
FILE_ATTRIBUTE_DIRECTORY & p->second->FileInfo.FileAttributes ? 'd' : 'f',
(ULONG)p->second->FileInfo.FileAttributes,
(ULONG)p->second->FileInfo.FileSize,
p->second->FileName);
}
static inline
BOOLEAN MemfsFileNodeMapIsCaseInsensitive(MEMFS_FILE_NODE_MAP *FileNodeMap)
{
return FileNodeMap->key_comp().CaseInsensitive;
}
static inline
NTSTATUS MemfsFileNodeMapCreate(BOOLEAN CaseInsensitive, MEMFS_FILE_NODE_MAP **PFileNodeMap)
{
*PFileNodeMap = 0;
try
{
*PFileNodeMap = new MEMFS_FILE_NODE_MAP(MEMFS_FILE_NODE_LESS(CaseInsensitive));
return STATUS_SUCCESS;
}
catch (...)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
}
static inline
VOID MemfsFileNodeMapDelete(MEMFS_FILE_NODE_MAP *FileNodeMap)
{
for (MEMFS_FILE_NODE_MAP::iterator p = FileNodeMap->begin(), q = FileNodeMap->end(); p != q; ++p)
MemfsFileNodeDelete(p->second);
delete FileNodeMap;
}
static inline
SIZE_T MemfsFileNodeMapCount(MEMFS_FILE_NODE_MAP *FileNodeMap)
{
return FileNodeMap->size();
}
static inline
MEMFS_FILE_NODE *MemfsFileNodeMapGet(MEMFS_FILE_NODE_MAP *FileNodeMap, PWSTR FileName)
{
MEMFS_FILE_NODE_MAP::iterator iter = FileNodeMap->find(FileName);
if (iter == FileNodeMap->end())
return 0;
return iter->second;
}
#if defined(MEMFS_NAMED_STREAMS)
static inline
MEMFS_FILE_NODE *MemfsFileNodeMapGetMain(MEMFS_FILE_NODE_MAP *FileNodeMap, PWSTR FileName0)
{
WCHAR FileName[MEMFS_MAX_PATH];
wcscpy_s(FileName, sizeof FileName / sizeof(WCHAR), FileName0);
PWSTR StreamName = wcschr(FileName, L':');
if (0 == StreamName)
return 0;
StreamName[0] = L'\0';
MEMFS_FILE_NODE_MAP::iterator iter = FileNodeMap->find(FileName);
if (iter == FileNodeMap->end())
return 0;
return iter->second;
}
#endif
static inline
MEMFS_FILE_NODE *MemfsFileNodeMapGetParent(MEMFS_FILE_NODE_MAP *FileNodeMap, PWSTR FileName0,
PNTSTATUS PResult)
{
WCHAR Root[2] = L"\\";
PWSTR Remain, Suffix;
WCHAR FileName[MEMFS_MAX_PATH];
wcscpy_s(FileName, sizeof FileName / sizeof(WCHAR), FileName0);
FspPathSuffix(FileName, &Remain, &Suffix, Root);
MEMFS_FILE_NODE_MAP::iterator iter = FileNodeMap->find(Remain);
FspPathCombine(FileName, Suffix);
if (iter == FileNodeMap->end())
{
*PResult = STATUS_OBJECT_PATH_NOT_FOUND;
return 0;
}
if (0 == (iter->second->FileInfo.FileAttributes & FILE_ATTRIBUTE_DIRECTORY))
{
*PResult = STATUS_NOT_A_DIRECTORY;
return 0;
}
return iter->second;
}
static inline
VOID MemfsFileNodeMapTouchParent(MEMFS_FILE_NODE_MAP *FileNodeMap, MEMFS_FILE_NODE *FileNode)
{
NTSTATUS Result;
MEMFS_FILE_NODE *Parent;
if (L'\\' == FileNode->FileName[0] && L'\0' == FileNode->FileName[1])
return;
Parent = MemfsFileNodeMapGetParent(FileNodeMap, FileNode->FileName, &Result);
if (0 == Parent)
return;
Parent->FileInfo.LastAccessTime =
Parent->FileInfo.LastWriteTime =
Parent->FileInfo.ChangeTime = MemfsGetSystemTime();
}
static inline
NTSTATUS MemfsFileNodeMapInsert(MEMFS_FILE_NODE_MAP *FileNodeMap, MEMFS_FILE_NODE *FileNode,
PBOOLEAN PInserted)
{
*PInserted = 0;
try
{
*PInserted = FileNodeMap->insert(MEMFS_FILE_NODE_MAP::value_type(FileNode->FileName, FileNode)).second;
if (*PInserted)
{
MemfsFileNodeReference(FileNode);
MemfsFileNodeMapTouchParent(FileNodeMap, FileNode);
}
return STATUS_SUCCESS;
}
catch (...)
{
return STATUS_INSUFFICIENT_RESOURCES;
}
}
static inline
VOID MemfsFileNodeMapRemove(MEMFS_FILE_NODE_MAP *FileNodeMap, MEMFS_FILE_NODE *FileNode)
{
if (FileNodeMap->erase(FileNode->FileName))
{
MemfsFileNodeMapTouchParent(FileNodeMap, FileNode);
MemfsFileNodeDereference(FileNode);
}
}
static inline
BOOLEAN MemfsFileNodeMapHasChild(MEMFS_FILE_NODE_MAP *FileNodeMap, MEMFS_FILE_NODE *FileNode)
{
BOOLEAN Result = FALSE;
WCHAR Root[2] = L"\\";
PWSTR Remain, Suffix;
MEMFS_FILE_NODE_MAP::iterator iter = FileNodeMap->upper_bound(FileNode->FileName);
for (; FileNodeMap->end() != iter; ++iter)
{
#if defined(MEMFS_NAMED_STREAMS)
if (0 != wcschr(iter->second->FileName, L':'))
continue;
#endif
FspPathSuffix(iter->second->FileName, &Remain, &Suffix, Root);
Result = 0 == MemfsFileNameCompare(Remain, -1, FileNode->FileName, -1,
MemfsFileNodeMapIsCaseInsensitive(FileNodeMap));
FspPathCombine(iter->second->FileName, Suffix);
break;
}
return Result;
}
static inline
BOOLEAN MemfsFileNodeMapEnumerateChildren(MEMFS_FILE_NODE_MAP *FileNodeMap, MEMFS_FILE_NODE *FileNode,
PWSTR PrevFileName0, BOOLEAN (*EnumFn)(MEMFS_FILE_NODE *, PVOID), PVOID Context)
{
WCHAR Root[2] = L"\\";
PWSTR Remain, Suffix;
MEMFS_FILE_NODE_MAP::iterator iter;
BOOLEAN IsDirectoryChild;
if (0 != PrevFileName0)
{
WCHAR PrevFileName[MEMFS_MAX_PATH + 256];
size_t Length0 = wcslen(FileNode->FileName);
size_t Length1 = 1 != Length0 || L'\\' != FileNode->FileName[0];
size_t Length2 = wcslen(PrevFileName0);
assert(MEMFS_MAX_PATH + 256 > Length0 + Length1 + Length2);
memcpy(PrevFileName, FileNode->FileName, Length0 * sizeof(WCHAR));
memcpy(PrevFileName + Length0, L"\\", Length1 * sizeof(WCHAR));
memcpy(PrevFileName + Length0 + Length1, PrevFileName0, Length2 * sizeof(WCHAR));
PrevFileName[Length0 + Length1 + Length2] = L'\0';
iter = FileNodeMap->upper_bound(PrevFileName);
}
else
iter = FileNodeMap->upper_bound(FileNode->FileName);
for (; FileNodeMap->end() != iter; ++iter)
{
if (!MemfsFileNameHasPrefix(iter->second->FileName, FileNode->FileName,
MemfsFileNodeMapIsCaseInsensitive(FileNodeMap)))
break;
FspPathSuffix(iter->second->FileName, &Remain, &Suffix, Root);
IsDirectoryChild = 0 == MemfsFileNameCompare(Remain, -1, FileNode->FileName, -1,
MemfsFileNodeMapIsCaseInsensitive(FileNodeMap));
#if defined(MEMFS_NAMED_STREAMS)
IsDirectoryChild = IsDirectoryChild && 0 == wcschr(Suffix, L':');
#endif
FspPathCombine(iter->second->FileName, Suffix);
if (IsDirectoryChild)
{
if (!EnumFn(iter->second, Context))
return FALSE;
}
}
return TRUE;
}
#if defined(MEMFS_NAMED_STREAMS)
static inline
BOOLEAN MemfsFileNodeMapEnumerateNamedStreams(MEMFS_FILE_NODE_MAP *FileNodeMap, MEMFS_FILE_NODE *FileNode,
BOOLEAN (*EnumFn)(MEMFS_FILE_NODE *, PVOID), PVOID Context)
{
MEMFS_FILE_NODE_MAP::iterator iter = FileNodeMap->upper_bound(FileNode->FileName);
for (; FileNodeMap->end() != iter; ++iter)
{
if (!MemfsFileNameHasPrefix(iter->second->FileName, FileNode->FileName,
MemfsFileNodeMapIsCaseInsensitive(FileNodeMap)))
break;
if (L':' != iter->second->FileName[wcslen(FileNode->FileName)])
break;
if (!EnumFn(iter->second, Context))
return FALSE;
}
return TRUE;
}
#endif
static inline
BOOLEAN MemfsFileNodeMapEnumerateDescendants(MEMFS_FILE_NODE_MAP *FileNodeMap, MEMFS_FILE_NODE *FileNode,
BOOLEAN (*EnumFn)(MEMFS_FILE_NODE *, PVOID), PVOID Context)
{
WCHAR Root[2] = L"\\";
MEMFS_FILE_NODE_MAP::iterator iter = FileNodeMap->lower_bound(FileNode->FileName);
for (; FileNodeMap->end() != iter; ++iter)
{
if (!MemfsFileNameHasPrefix(iter->second->FileName, FileNode->FileName,
MemfsFileNodeMapIsCaseInsensitive(FileNodeMap)))
break;
if (!EnumFn(iter->second, Context))
return FALSE;
}
return TRUE;
}
typedef struct _MEMFS_FILE_NODE_MAP_ENUM_CONTEXT
{
BOOLEAN Reference;
MEMFS_FILE_NODE **FileNodes;
ULONG Capacity, Count;
} MEMFS_FILE_NODE_MAP_ENUM_CONTEXT;
static inline
BOOLEAN MemfsFileNodeMapEnumerateFn(MEMFS_FILE_NODE *FileNode, PVOID Context0)
{
MEMFS_FILE_NODE_MAP_ENUM_CONTEXT *Context = (MEMFS_FILE_NODE_MAP_ENUM_CONTEXT *)Context0;
if (Context->Capacity <= Context->Count)
{
ULONG Capacity = 0 != Context->Capacity ? Context->Capacity * 2 : 16;
PVOID P = realloc(Context->FileNodes, Capacity * sizeof Context->FileNodes[0]);
if (0 == P)
{
FspDebugLog(__FUNCTION__ ": cannot allocate memory; aborting\n");
abort();
}
Context->FileNodes = (MEMFS_FILE_NODE **)P;
Context->Capacity = Capacity;
}
Context->FileNodes[Context->Count++] = FileNode;
if (Context->Reference)
MemfsFileNodeReference(FileNode);
return TRUE;
}
static inline
VOID MemfsFileNodeMapEnumerateFree(MEMFS_FILE_NODE_MAP_ENUM_CONTEXT *Context)
{
if (Context->Reference)
{
for (ULONG Index = 0; Context->Count > Index; Index++)
{
MEMFS_FILE_NODE *FileNode = Context->FileNodes[Index];
MemfsFileNodeDereference(FileNode);
}
}
free(Context->FileNodes);
}
#ifdef MEMFS_SLOWIO
/*
* SLOWIO
*
* This is included for two uses:
*
* 1) For testing winfsp, by allowing memfs to act more like a non-ram file system,
* with some IO taking many milliseconds, and some IO completion delayed.
*
* 2) As sample code for how to use winfsp's STATUS_PENDING capabilities.
*
*/
static inline UINT64 Hash(UINT64 x)
{
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9ull;
x = (x ^ (x >> 27)) * 0x94d049bb133111ebull;
x = x ^ (x >> 31);
return x;
}
static inline ULONG PseudoRandom(ULONG to)
{
/* John Oberschelp's PRNG */
static UINT64 spin = 0;
InterlockedIncrement(&spin);
return Hash(spin) % to;
}
static inline BOOLEAN SlowioReturnPending(FSP_FILE_SYSTEM *FileSystem)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
if (0 == Memfs->SlowioMaxDelay)
return FALSE;
return PseudoRandom(100) < Memfs->SlowioPercentDelay;
}
static inline VOID SlowioSnooze(FSP_FILE_SYSTEM *FileSystem)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
if (0 == Memfs->SlowioMaxDelay)
return;
ULONG millis = PseudoRandom(Memfs->SlowioMaxDelay + 1) >> PseudoRandom(Memfs->SlowioRarefyDelay + 1);
Sleep(millis);
}
void SlowioReadThread(
FSP_FILE_SYSTEM *FileSystem,
MEMFS_FILE_NODE *FileNode,
PVOID Buffer,
UINT64 Offset,
UINT64 EndOffset,
UINT64 RequestHint)
{
SlowioSnooze(FileSystem);
memcpy(Buffer, (PUINT8)FileNode->FileData + Offset, (size_t)(EndOffset - Offset));
UINT32 BytesTransferred = (ULONG)(EndOffset - Offset);
FSP_FSCTL_TRANSACT_RSP ResponseBuf;
memset(&ResponseBuf, 0, sizeof ResponseBuf);
ResponseBuf.Size = sizeof ResponseBuf;
ResponseBuf.Kind = FspFsctlTransactReadKind;
ResponseBuf.Hint = RequestHint; // IRP that is being completed
ResponseBuf.IoStatus.Status = STATUS_SUCCESS;
ResponseBuf.IoStatus.Information = BytesTransferred; // bytes read
FspFileSystemSendResponse(FileSystem, &ResponseBuf);
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
InterlockedDecrement(&Memfs->SlowioThreadsRunning);
}
void SlowioWriteThread(
FSP_FILE_SYSTEM *FileSystem,
MEMFS_FILE_NODE *FileNode,
PVOID Buffer,
UINT64 Offset,
UINT64 EndOffset,
UINT64 RequestHint)
{
SlowioSnooze(FileSystem);
memcpy((PUINT8)FileNode->FileData + Offset, Buffer, (size_t)(EndOffset - Offset));
UINT32 BytesTransferred = (ULONG)(EndOffset - Offset);
FSP_FSCTL_TRANSACT_RSP ResponseBuf;
memset(&ResponseBuf, 0, sizeof ResponseBuf);
ResponseBuf.Size = sizeof ResponseBuf;
ResponseBuf.Kind = FspFsctlTransactWriteKind;
ResponseBuf.Hint = RequestHint; // IRP that is being completed
ResponseBuf.IoStatus.Status = STATUS_SUCCESS;
ResponseBuf.IoStatus.Information = BytesTransferred; // bytes written
MemfsFileNodeGetFileInfo(FileNode, &ResponseBuf.Rsp.Write.FileInfo);
FspFileSystemSendResponse(FileSystem, &ResponseBuf);
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
InterlockedDecrement(&Memfs->SlowioThreadsRunning);
}
void SlowioReadDirectoryThread(
FSP_FILE_SYSTEM *FileSystem,
ULONG BytesTransferred,
UINT64 RequestHint)
{
SlowioSnooze(FileSystem);
FSP_FSCTL_TRANSACT_RSP ResponseBuf;
memset(&ResponseBuf, 0, sizeof ResponseBuf);
ResponseBuf.Size = sizeof ResponseBuf;
ResponseBuf.Kind = FspFsctlTransactQueryDirectoryKind;
ResponseBuf.Hint = RequestHint; // IRP that is being completed
ResponseBuf.IoStatus.Status = STATUS_SUCCESS;
ResponseBuf.IoStatus.Information = BytesTransferred; // bytes of directory info read
FspFileSystemSendResponse(FileSystem, &ResponseBuf);
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
InterlockedDecrement(&Memfs->SlowioThreadsRunning);
}
#endif
/*
* FSP_FILE_SYSTEM_INTERFACE
*/
#if defined(MEMFS_REPARSE_POINTS)
static NTSTATUS GetReparsePointByName(
FSP_FILE_SYSTEM *FileSystem, PVOID Context,
PWSTR FileName, BOOLEAN IsDirectory, PVOID Buffer, PSIZE_T PSize);
#endif
static NTSTATUS SetFileSizeInternal(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, UINT64 NewSize, BOOLEAN SetAllocationSize);
static NTSTATUS GetVolumeInfo(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_VOLUME_INFO *VolumeInfo)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
VolumeInfo->TotalSize = Memfs->MaxFileNodes * (UINT64)Memfs->MaxFileSize;
VolumeInfo->FreeSize = (Memfs->MaxFileNodes - MemfsFileNodeMapCount(Memfs->FileNodeMap)) *
(UINT64)Memfs->MaxFileSize;
VolumeInfo->VolumeLabelLength = Memfs->VolumeLabelLength;
memcpy(VolumeInfo->VolumeLabel, Memfs->VolumeLabel, Memfs->VolumeLabelLength);
return STATUS_SUCCESS;
}
static NTSTATUS SetVolumeLabel(FSP_FILE_SYSTEM *FileSystem,
PWSTR VolumeLabel,
FSP_FSCTL_VOLUME_INFO *VolumeInfo)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
Memfs->VolumeLabelLength = (UINT16)(wcslen(VolumeLabel) * sizeof(WCHAR));
if (Memfs->VolumeLabelLength > sizeof Memfs->VolumeLabel)
Memfs->VolumeLabelLength = sizeof Memfs->VolumeLabel;
memcpy(Memfs->VolumeLabel, VolumeLabel, Memfs->VolumeLabelLength);
VolumeInfo->TotalSize = Memfs->MaxFileNodes * Memfs->MaxFileSize;
VolumeInfo->FreeSize =
(Memfs->MaxFileNodes - MemfsFileNodeMapCount(Memfs->FileNodeMap)) * Memfs->MaxFileSize;
VolumeInfo->VolumeLabelLength = Memfs->VolumeLabelLength;
memcpy(VolumeInfo->VolumeLabel, Memfs->VolumeLabel, Memfs->VolumeLabelLength);
return STATUS_SUCCESS;
}
static NTSTATUS GetSecurityByName(FSP_FILE_SYSTEM *FileSystem,
PWSTR FileName, PUINT32 PFileAttributes,
PSECURITY_DESCRIPTOR SecurityDescriptor, SIZE_T *PSecurityDescriptorSize)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode;
NTSTATUS Result;
FileNode = MemfsFileNodeMapGet(Memfs->FileNodeMap, FileName);
if (0 == FileNode)
{
Result = STATUS_OBJECT_NAME_NOT_FOUND;
#if defined(MEMFS_REPARSE_POINTS)
if (FspFileSystemFindReparsePoint(FileSystem, GetReparsePointByName, 0,
FileName, PFileAttributes))
Result = STATUS_REPARSE;
else
#endif
MemfsFileNodeMapGetParent(Memfs->FileNodeMap, FileName, &Result);
return Result;
}
#if defined(MEMFS_NAMED_STREAMS)
UINT32 FileAttributesMask = ~(UINT32)0;
if (0 != FileNode->MainFileNode)
{
FileAttributesMask = ~(UINT32)FILE_ATTRIBUTE_DIRECTORY;
FileNode = FileNode->MainFileNode;
}
if (0 != PFileAttributes)
*PFileAttributes = FileNode->FileInfo.FileAttributes & FileAttributesMask;
#else
if (0 != PFileAttributes)
*PFileAttributes = FileNode->FileInfo.FileAttributes;
#endif
if (0 != PSecurityDescriptorSize)
{
if (FileNode->FileSecuritySize > *PSecurityDescriptorSize)
{
*PSecurityDescriptorSize = FileNode->FileSecuritySize;
return STATUS_BUFFER_OVERFLOW;
}
*PSecurityDescriptorSize = FileNode->FileSecuritySize;
if (0 != SecurityDescriptor)
memcpy(SecurityDescriptor, FileNode->FileSecurity, FileNode->FileSecuritySize);
}
return STATUS_SUCCESS;
}
static NTSTATUS Create(FSP_FILE_SYSTEM *FileSystem,
PWSTR FileName, UINT32 CreateOptions, UINT32 GrantedAccess,
UINT32 FileAttributes, PSECURITY_DESCRIPTOR SecurityDescriptor, UINT64 AllocationSize,
#if defined(MEMFS_EA) || defined(MEMFS_WSL)
PVOID ExtraBuffer, ULONG ExtraLength, BOOLEAN ExtraBufferIsReparsePoint,
#endif
PVOID *PFileNode, FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
#if defined(MEMFS_NAME_NORMALIZATION)
WCHAR FileNameBuf[MEMFS_MAX_PATH];
#endif
MEMFS_FILE_NODE *FileNode;
MEMFS_FILE_NODE *ParentNode;
NTSTATUS Result;
BOOLEAN Inserted;
if (MEMFS_MAX_PATH <= wcslen(FileName))
return STATUS_OBJECT_NAME_INVALID;
if (CreateOptions & FILE_DIRECTORY_FILE)
AllocationSize = 0;
FileNode = MemfsFileNodeMapGet(Memfs->FileNodeMap, FileName);
if (0 != FileNode)
return STATUS_OBJECT_NAME_COLLISION;
ParentNode = MemfsFileNodeMapGetParent(Memfs->FileNodeMap, FileName, &Result);
if (0 == ParentNode)
return Result;
if (MemfsFileNodeMapCount(Memfs->FileNodeMap) >= Memfs->MaxFileNodes)
return STATUS_CANNOT_MAKE;
if (AllocationSize > Memfs->MaxFileSize)
return STATUS_DISK_FULL;
#if defined(MEMFS_NAME_NORMALIZATION)
if (MemfsFileNodeMapIsCaseInsensitive(Memfs->FileNodeMap))
{
WCHAR Root[2] = L"\\";
PWSTR Remain, Suffix;
size_t RemainLength, BSlashLength, SuffixLength;
FspPathSuffix(FileName, &Remain, &Suffix, Root);
assert(0 == MemfsFileNameCompare(Remain, -1, ParentNode->FileName, -1, TRUE));
FspPathCombine(FileName, Suffix);
RemainLength = wcslen(ParentNode->FileName);
BSlashLength = 1 < RemainLength;
SuffixLength = wcslen(Suffix);
if (MEMFS_MAX_PATH <= RemainLength + BSlashLength + SuffixLength)
return STATUS_OBJECT_NAME_INVALID;
memcpy(FileNameBuf, ParentNode->FileName, RemainLength * sizeof(WCHAR));
memcpy(FileNameBuf + RemainLength, L"\\", BSlashLength * sizeof(WCHAR));
memcpy(FileNameBuf + RemainLength + BSlashLength, Suffix, (SuffixLength + 1) * sizeof(WCHAR));
FileName = FileNameBuf;
}
#endif
Result = MemfsFileNodeCreate(FileName, &FileNode);
if (!NT_SUCCESS(Result))
return Result;
#if defined(MEMFS_NAMED_STREAMS)
FileNode->MainFileNode = MemfsFileNodeMapGetMain(Memfs->FileNodeMap, FileName);
#endif
FileNode->FileInfo.FileAttributes = (FileAttributes & FILE_ATTRIBUTE_DIRECTORY) ?
FileAttributes : FileAttributes | FILE_ATTRIBUTE_ARCHIVE;
if (0 != SecurityDescriptor)
{
FileNode->FileSecuritySize = GetSecurityDescriptorLength(SecurityDescriptor);
FileNode->FileSecurity = (PSECURITY_DESCRIPTOR)malloc(FileNode->FileSecuritySize);
if (0 == FileNode->FileSecurity)
{
MemfsFileNodeDelete(FileNode);
return STATUS_INSUFFICIENT_RESOURCES;
}
memcpy(FileNode->FileSecurity, SecurityDescriptor, FileNode->FileSecuritySize);
}
#if defined(MEMFS_EA) || defined(MEMFS_WSL)
if (0 != ExtraBuffer)
{
#if defined(MEMFS_EA)
if (!ExtraBufferIsReparsePoint)
{
Result = FspFileSystemEnumerateEa(FileSystem, MemfsFileNodeSetEa, FileNode,
(PFILE_FULL_EA_INFORMATION)ExtraBuffer, ExtraLength);
if (!NT_SUCCESS(Result))
{
MemfsFileNodeDelete(FileNode);
return Result;
}
}
#endif
#if defined(MEMFS_WSL)
if (ExtraBufferIsReparsePoint)
{
#if defined(MEMFS_REPARSE_POINTS)
FileNode->ReparseDataSize = ExtraLength;
FileNode->ReparseData = malloc(ExtraLength);
if (0 == FileNode->ReparseData && 0 != ExtraLength)
{
MemfsFileNodeDelete(FileNode);
return STATUS_INSUFFICIENT_RESOURCES;
}
FileNode->FileInfo.FileAttributes |= FILE_ATTRIBUTE_REPARSE_POINT;
FileNode->FileInfo.ReparseTag = *(PULONG)ExtraBuffer;
/* the first field in a reparse buffer is the reparse tag */
memcpy(FileNode->ReparseData, ExtraBuffer, ExtraLength);
#else
MemfsFileNodeDelete(FileNode);
return STATUS_INVALID_PARAMETER;
#endif
}
#endif
}
#endif
FileNode->FileInfo.AllocationSize = AllocationSize;
if (0 != FileNode->FileInfo.AllocationSize)
{
FileNode->FileData = LargeHeapAlloc((size_t)FileNode->FileInfo.AllocationSize);
if (0 == FileNode->FileData)
{
MemfsFileNodeDelete(FileNode);
return STATUS_INSUFFICIENT_RESOURCES;
}
}
Result = MemfsFileNodeMapInsert(Memfs->FileNodeMap, FileNode, &Inserted);
if (!NT_SUCCESS(Result) || !Inserted)
{
MemfsFileNodeDelete(FileNode);
if (NT_SUCCESS(Result))
Result = STATUS_OBJECT_NAME_COLLISION; /* should not happen! */
return Result;
}
MemfsFileNodeReference(FileNode);
*PFileNode = FileNode;
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
#if defined(MEMFS_NAME_NORMALIZATION)
if (MemfsFileNodeMapIsCaseInsensitive(Memfs->FileNodeMap))
{
FSP_FSCTL_OPEN_FILE_INFO *OpenFileInfo = FspFileSystemGetOpenFileInfo(FileInfo);
wcscpy_s(OpenFileInfo->NormalizedName, OpenFileInfo->NormalizedNameSize / sizeof(WCHAR),
FileNode->FileName);
OpenFileInfo->NormalizedNameSize = (UINT16)(wcslen(FileNode->FileName) * sizeof(WCHAR));
}
#endif
return STATUS_SUCCESS;
}
static NTSTATUS Open(FSP_FILE_SYSTEM *FileSystem,
PWSTR FileName, UINT32 CreateOptions, UINT32 GrantedAccess,
PVOID *PFileNode, FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode;
NTSTATUS Result;
if (MEMFS_MAX_PATH <= wcslen(FileName))
return STATUS_OBJECT_NAME_INVALID;
FileNode = MemfsFileNodeMapGet(Memfs->FileNodeMap, FileName);
if (0 == FileNode)
{
Result = STATUS_OBJECT_NAME_NOT_FOUND;
MemfsFileNodeMapGetParent(Memfs->FileNodeMap, FileName, &Result);
return Result;
}
#if defined(MEMFS_EA)
/* if the OP specified no EA's check the need EA count, but only if accessing main stream */
if (0 != (CreateOptions & FILE_NO_EA_KNOWLEDGE)
#if defined(MEMFS_NAMED_STREAMS)
&& (0 == FileNode->MainFileNode)
#endif
)
{
if (MemfsFileNodeNeedEa(FileNode))
{
Result = STATUS_ACCESS_DENIED;
return Result;
}
}
#endif
MemfsFileNodeReference(FileNode);
*PFileNode = FileNode;
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
#if defined(MEMFS_NAME_NORMALIZATION)
if (MemfsFileNodeMapIsCaseInsensitive(Memfs->FileNodeMap))
{
FSP_FSCTL_OPEN_FILE_INFO *OpenFileInfo = FspFileSystemGetOpenFileInfo(FileInfo);
wcscpy_s(OpenFileInfo->NormalizedName, OpenFileInfo->NormalizedNameSize / sizeof(WCHAR),
FileNode->FileName);
OpenFileInfo->NormalizedNameSize = (UINT16)(wcslen(FileNode->FileName) * sizeof(WCHAR));
}
#endif
return STATUS_SUCCESS;
}
static NTSTATUS Overwrite(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, UINT32 FileAttributes, BOOLEAN ReplaceFileAttributes, UINT64 AllocationSize,
#if defined(MEMFS_EA)
PFILE_FULL_EA_INFORMATION Ea, ULONG EaLength,
#endif
FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
NTSTATUS Result;
#if defined(MEMFS_NAMED_STREAMS)
MEMFS_FILE_NODE_MAP_ENUM_CONTEXT Context = { TRUE };
ULONG Index;
MemfsFileNodeMapEnumerateNamedStreams(Memfs->FileNodeMap, FileNode,
MemfsFileNodeMapEnumerateFn, &Context);
for (Index = 0; Context.Count > Index; Index++)
{
LONG RefCount = FspInterlockedLoad32((INT32 *)&Context.FileNodes[Index]->RefCount);
if (2 >= RefCount)
MemfsFileNodeMapRemove(Memfs->FileNodeMap, Context.FileNodes[Index]);
}
MemfsFileNodeMapEnumerateFree(&Context);
#endif
#if defined(MEMFS_EA)
MemfsFileNodeDeleteEaMap(FileNode);
if (0 != Ea)
{
Result = FspFileSystemEnumerateEa(FileSystem, MemfsFileNodeSetEa, FileNode, Ea, EaLength);
if (!NT_SUCCESS(Result))
return Result;
}
#endif
Result = SetFileSizeInternal(FileSystem, FileNode, AllocationSize, TRUE);
if (!NT_SUCCESS(Result))
return Result;
if (ReplaceFileAttributes)
FileNode->FileInfo.FileAttributes = FileAttributes | FILE_ATTRIBUTE_ARCHIVE;
else
FileNode->FileInfo.FileAttributes |= FileAttributes | FILE_ATTRIBUTE_ARCHIVE;
FileNode->FileInfo.FileSize = 0;
FileNode->FileInfo.LastAccessTime =
FileNode->FileInfo.LastWriteTime =
FileNode->FileInfo.ChangeTime = MemfsGetSystemTime();
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
return STATUS_SUCCESS;
}
static VOID Cleanup(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PWSTR FileName, ULONG Flags)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
#if defined(MEMFS_NAMED_STREAMS)
MEMFS_FILE_NODE *MainFileNode = 0 != FileNode->MainFileNode ?
FileNode->MainFileNode : FileNode;
#else
MEMFS_FILE_NODE *MainFileNode = FileNode;
#endif
assert(0 != Flags); /* FSP_FSCTL_VOLUME_PARAMS::PostCleanupWhenModifiedOnly ensures this */
if (Flags & FspCleanupSetArchiveBit)
{
if (0 == (MainFileNode->FileInfo.FileAttributes & FILE_ATTRIBUTE_DIRECTORY))
MainFileNode->FileInfo.FileAttributes |= FILE_ATTRIBUTE_ARCHIVE;
}
if (Flags & (FspCleanupSetLastAccessTime | FspCleanupSetLastWriteTime | FspCleanupSetChangeTime))
{
UINT64 SystemTime = MemfsGetSystemTime();
if (Flags & FspCleanupSetLastAccessTime)
MainFileNode->FileInfo.LastAccessTime = SystemTime;
if (Flags & FspCleanupSetLastWriteTime)
MainFileNode->FileInfo.LastWriteTime = SystemTime;
if (Flags & FspCleanupSetChangeTime)
MainFileNode->FileInfo.ChangeTime = SystemTime;
}
if (Flags & FspCleanupSetAllocationSize)
{
UINT64 AllocationUnit = MEMFS_SECTOR_SIZE * MEMFS_SECTORS_PER_ALLOCATION_UNIT;
UINT64 AllocationSize = (FileNode->FileInfo.FileSize + AllocationUnit - 1) /
AllocationUnit * AllocationUnit;
SetFileSizeInternal(FileSystem, FileNode, AllocationSize, TRUE);
}
if ((Flags & FspCleanupDelete) && !MemfsFileNodeMapHasChild(Memfs->FileNodeMap, FileNode))
{
#if defined(MEMFS_NAMED_STREAMS)
MEMFS_FILE_NODE_MAP_ENUM_CONTEXT Context = { FALSE };
ULONG Index;
MemfsFileNodeMapEnumerateNamedStreams(Memfs->FileNodeMap, FileNode,
MemfsFileNodeMapEnumerateFn, &Context);
for (Index = 0; Context.Count > Index; Index++)
MemfsFileNodeMapRemove(Memfs->FileNodeMap, Context.FileNodes[Index]);
MemfsFileNodeMapEnumerateFree(&Context);
#endif
MemfsFileNodeMapRemove(Memfs->FileNodeMap, FileNode);
}
}
static VOID Close(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
MemfsFileNodeDereference(FileNode);
}
static NTSTATUS Read(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PVOID Buffer, UINT64 Offset, ULONG Length,
PULONG PBytesTransferred)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
UINT64 EndOffset;
if (Offset >= FileNode->FileInfo.FileSize)
return STATUS_END_OF_FILE;
EndOffset = Offset + Length;
if (EndOffset > FileNode->FileInfo.FileSize)
EndOffset = FileNode->FileInfo.FileSize;
#ifdef MEMFS_SLOWIO
if (SlowioReturnPending(FileSystem))
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
try
{
InterlockedIncrement(&Memfs->SlowioThreadsRunning);
std::thread(SlowioReadThread,
FileSystem, FileNode, Buffer, Offset, EndOffset,
FspFileSystemGetOperationContext()->Request->Hint).
detach();
return STATUS_PENDING;
}
catch (...)
{
InterlockedDecrement(&Memfs->SlowioThreadsRunning);
}
}
SlowioSnooze(FileSystem);
#endif
memcpy(Buffer, (PUINT8)FileNode->FileData + Offset, (size_t)(EndOffset - Offset));
*PBytesTransferred = (ULONG)(EndOffset - Offset);
return STATUS_SUCCESS;
}
static NTSTATUS Write(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PVOID Buffer, UINT64 Offset, ULONG Length,
BOOLEAN WriteToEndOfFile, BOOLEAN ConstrainedIo,
PULONG PBytesTransferred, FSP_FSCTL_FILE_INFO *FileInfo)
{
#if defined(DEBUG_BUFFER_CHECK)
SYSTEM_INFO SystemInfo;
GetSystemInfo(&SystemInfo);
for (PUINT8 P = (PUINT8)Buffer, EndP = P + Length; EndP > P; P += SystemInfo.dwPageSize)
__try
{
*P = *P | 0;
assert(!IsWindows8OrGreater());
/* only on Windows 8 we can make the buffer read-only! */
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
/* ignore! */
}
#endif
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
UINT64 EndOffset;
NTSTATUS Result;
if (ConstrainedIo)
{
if (Offset >= FileNode->FileInfo.FileSize)
return STATUS_SUCCESS;
EndOffset = Offset + Length;
if (EndOffset > FileNode->FileInfo.FileSize)
EndOffset = FileNode->FileInfo.FileSize;
}
else
{
if (WriteToEndOfFile)
Offset = FileNode->FileInfo.FileSize;
EndOffset = Offset + Length;
if (EndOffset > FileNode->FileInfo.FileSize)
{
Result = SetFileSizeInternal(FileSystem, FileNode, EndOffset, FALSE);
if (!NT_SUCCESS(Result))
return Result;
}
}
#ifdef MEMFS_SLOWIO
if (SlowioReturnPending(FileSystem))
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
try
{
InterlockedIncrement(&Memfs->SlowioThreadsRunning);
std::thread(SlowioWriteThread,
FileSystem, FileNode, Buffer, Offset, EndOffset,
FspFileSystemGetOperationContext()->Request->Hint).
detach();
return STATUS_PENDING;
}
catch (...)
{
InterlockedDecrement(&Memfs->SlowioThreadsRunning);
}
}
SlowioSnooze(FileSystem);
#endif
memcpy((PUINT8)FileNode->FileData + Offset, Buffer, (size_t)(EndOffset - Offset));
*PBytesTransferred = (ULONG)(EndOffset - Offset);
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
return STATUS_SUCCESS;
}
NTSTATUS Flush(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
/* nothing to flush, since we do not cache anything */
if (0 != FileNode)
{
#if 0
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode->MainFileNode->FileInfo.LastAccessTime =
FileNode->MainFileNode->FileInfo.LastWriteTime =
FileNode->MainFileNode->FileInfo.ChangeTime = MemfsGetSystemTime();
else
#endif
FileNode->FileInfo.LastAccessTime =
FileNode->FileInfo.LastWriteTime =
FileNode->FileInfo.ChangeTime = MemfsGetSystemTime();
#endif
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
}
return STATUS_SUCCESS;
}
static NTSTATUS GetFileInfo(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
return STATUS_SUCCESS;
}
static NTSTATUS SetBasicInfo(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, UINT32 FileAttributes,
UINT64 CreationTime, UINT64 LastAccessTime, UINT64 LastWriteTime, UINT64 ChangeTime,
FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
if (INVALID_FILE_ATTRIBUTES != FileAttributes)
FileNode->FileInfo.FileAttributes = FileAttributes;
if (0 != CreationTime)
FileNode->FileInfo.CreationTime = CreationTime;
if (0 != LastAccessTime)
FileNode->FileInfo.LastAccessTime = LastAccessTime;
if (0 != LastWriteTime)
FileNode->FileInfo.LastWriteTime = LastWriteTime;
if (0 != ChangeTime)
FileNode->FileInfo.ChangeTime = ChangeTime;
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
return STATUS_SUCCESS;
}
static NTSTATUS SetFileSizeInternal(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, UINT64 NewSize, BOOLEAN SetAllocationSize)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
if (SetAllocationSize)
{
if (FileNode->FileInfo.AllocationSize != NewSize)
{
if (NewSize > Memfs->MaxFileSize)
return STATUS_DISK_FULL;
PVOID FileData = LargeHeapRealloc(FileNode->FileData, (size_t)NewSize);
if (0 == FileData && 0 != NewSize)
return STATUS_INSUFFICIENT_RESOURCES;
FileNode->FileData = FileData;
FileNode->FileInfo.AllocationSize = NewSize;
if (FileNode->FileInfo.FileSize > NewSize)
FileNode->FileInfo.FileSize = NewSize;
}
}
else
{
if (FileNode->FileInfo.FileSize != NewSize)
{
if (FileNode->FileInfo.AllocationSize < NewSize)
{
UINT64 AllocationUnit = MEMFS_SECTOR_SIZE * MEMFS_SECTORS_PER_ALLOCATION_UNIT;
UINT64 AllocationSize = (NewSize + AllocationUnit - 1) / AllocationUnit * AllocationUnit;
NTSTATUS Result = SetFileSizeInternal(FileSystem, FileNode, AllocationSize, TRUE);
if (!NT_SUCCESS(Result))
return Result;
}
if (FileNode->FileInfo.FileSize < NewSize)
memset((PUINT8)FileNode->FileData + FileNode->FileInfo.FileSize, 0,
(size_t)(NewSize - FileNode->FileInfo.FileSize));
FileNode->FileInfo.FileSize = NewSize;
}
}
return STATUS_SUCCESS;
}
static NTSTATUS SetFileSize(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, UINT64 NewSize, BOOLEAN SetAllocationSize,
FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
NTSTATUS Result;
Result = SetFileSizeInternal(FileSystem, FileNode0, NewSize, SetAllocationSize);
if (!NT_SUCCESS(Result))
return Result;
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
return STATUS_SUCCESS;
}
static NTSTATUS CanDelete(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PWSTR FileName)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
if (MemfsFileNodeMapHasChild(Memfs->FileNodeMap, FileNode))
return STATUS_DIRECTORY_NOT_EMPTY;
return STATUS_SUCCESS;
}
static NTSTATUS Rename(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
PWSTR FileName, PWSTR NewFileName, BOOLEAN ReplaceIfExists)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
MEMFS_FILE_NODE *NewFileNode, *DescendantFileNode;
MEMFS_FILE_NODE_MAP_ENUM_CONTEXT Context = { TRUE };
ULONG Index, FileNameLen, NewFileNameLen;
BOOLEAN Inserted;
NTSTATUS Result;
NewFileNode = MemfsFileNodeMapGet(Memfs->FileNodeMap, NewFileName);
if (0 != NewFileNode && FileNode != NewFileNode)
{
if (!ReplaceIfExists)
{
Result = STATUS_OBJECT_NAME_COLLISION;
goto exit;
}
if (NewFileNode->FileInfo.FileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
Result = STATUS_ACCESS_DENIED;
goto exit;
}
}
MemfsFileNodeMapEnumerateDescendants(Memfs->FileNodeMap, FileNode,
MemfsFileNodeMapEnumerateFn, &Context);
FileNameLen = (ULONG)wcslen(FileNode->FileName);
NewFileNameLen = (ULONG)wcslen(NewFileName);
for (Index = 0; Context.Count > Index; Index++)
{
DescendantFileNode = Context.FileNodes[Index];
if (MEMFS_MAX_PATH <= wcslen(DescendantFileNode->FileName) - FileNameLen + NewFileNameLen)
{
Result = STATUS_OBJECT_NAME_INVALID;
goto exit;
}
}
if (0 != NewFileNode)
{
MemfsFileNodeReference(NewFileNode);
MemfsFileNodeMapRemove(Memfs->FileNodeMap, NewFileNode);
MemfsFileNodeDereference(NewFileNode);
}
for (Index = 0; Context.Count > Index; Index++)
{
DescendantFileNode = Context.FileNodes[Index];
MemfsFileNodeMapRemove(Memfs->FileNodeMap, DescendantFileNode);
memmove(DescendantFileNode->FileName + NewFileNameLen,
DescendantFileNode->FileName + FileNameLen,
(wcslen(DescendantFileNode->FileName) + 1 - FileNameLen) * sizeof(WCHAR));
memcpy(DescendantFileNode->FileName, NewFileName, NewFileNameLen * sizeof(WCHAR));
Result = MemfsFileNodeMapInsert(Memfs->FileNodeMap, DescendantFileNode, &Inserted);
if (!NT_SUCCESS(Result))
{
FspDebugLog(__FUNCTION__ ": cannot insert into FileNodeMap; aborting\n");
abort();
}
assert(Inserted);
}
Result = STATUS_SUCCESS;
exit:
MemfsFileNodeMapEnumerateFree(&Context);
return Result;
}
static NTSTATUS GetSecurity(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
PSECURITY_DESCRIPTOR SecurityDescriptor, SIZE_T *PSecurityDescriptorSize)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
if (FileNode->FileSecuritySize > *PSecurityDescriptorSize)
{
*PSecurityDescriptorSize = FileNode->FileSecuritySize;
return STATUS_BUFFER_OVERFLOW;
}
*PSecurityDescriptorSize = FileNode->FileSecuritySize;
if (0 != SecurityDescriptor)
memcpy(SecurityDescriptor, FileNode->FileSecurity, FileNode->FileSecuritySize);
return STATUS_SUCCESS;
}
static NTSTATUS SetSecurity(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
SECURITY_INFORMATION SecurityInformation, PSECURITY_DESCRIPTOR ModificationDescriptor)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
PSECURITY_DESCRIPTOR NewSecurityDescriptor, FileSecurity;
SIZE_T FileSecuritySize;
NTSTATUS Result;
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
Result = FspSetSecurityDescriptor(
FileNode->FileSecurity,
SecurityInformation,
ModificationDescriptor,
&NewSecurityDescriptor);
if (!NT_SUCCESS(Result))
return Result;
FileSecuritySize = GetSecurityDescriptorLength(NewSecurityDescriptor);
FileSecurity = (PSECURITY_DESCRIPTOR)malloc(FileSecuritySize);
if (0 == FileSecurity)
{
FspDeleteSecurityDescriptor(NewSecurityDescriptor, (NTSTATUS (*)())FspSetSecurityDescriptor);
return STATUS_INSUFFICIENT_RESOURCES;
}
memcpy(FileSecurity, NewSecurityDescriptor, FileSecuritySize);
FspDeleteSecurityDescriptor(NewSecurityDescriptor, (NTSTATUS (*)())FspSetSecurityDescriptor);
free(FileNode->FileSecurity);
FileNode->FileSecuritySize = FileSecuritySize;
FileNode->FileSecurity = FileSecurity;
return STATUS_SUCCESS;
}
typedef struct _MEMFS_READ_DIRECTORY_CONTEXT
{
PVOID Buffer;
ULONG Length;
PULONG PBytesTransferred;
} MEMFS_READ_DIRECTORY_CONTEXT;
static BOOLEAN AddDirInfo(MEMFS_FILE_NODE *FileNode, PWSTR FileName,
PVOID Buffer, ULONG Length, PULONG PBytesTransferred)
{
UINT8 DirInfoBuf[sizeof(FSP_FSCTL_DIR_INFO) + sizeof FileNode->FileName];
FSP_FSCTL_DIR_INFO *DirInfo = (FSP_FSCTL_DIR_INFO *)DirInfoBuf;
WCHAR Root[2] = L"\\";
PWSTR Remain, Suffix;
if (0 == FileName)
{
FspPathSuffix(FileNode->FileName, &Remain, &Suffix, Root);
FileName = Suffix;
FspPathCombine(FileNode->FileName, Suffix);
}
memset(DirInfo->Padding, 0, sizeof DirInfo->Padding);
DirInfo->Size = (UINT16)(sizeof(FSP_FSCTL_DIR_INFO) + wcslen(FileName) * sizeof(WCHAR));
DirInfo->FileInfo = FileNode->FileInfo;
memcpy(DirInfo->FileNameBuf, FileName, DirInfo->Size - sizeof(FSP_FSCTL_DIR_INFO));
return FspFileSystemAddDirInfo(DirInfo, Buffer, Length, PBytesTransferred);
}
static BOOLEAN ReadDirectoryEnumFn(MEMFS_FILE_NODE *FileNode, PVOID Context0)
{
MEMFS_READ_DIRECTORY_CONTEXT *Context = (MEMFS_READ_DIRECTORY_CONTEXT *)Context0;
return AddDirInfo(FileNode, 0,
Context->Buffer, Context->Length, Context->PBytesTransferred);
}
static NTSTATUS ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PWSTR Pattern, PWSTR Marker,
PVOID Buffer, ULONG Length, PULONG PBytesTransferred)
{
assert(0 == Pattern);
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
MEMFS_FILE_NODE *ParentNode;
MEMFS_READ_DIRECTORY_CONTEXT Context;
NTSTATUS Result;
Context.Buffer = Buffer;
Context.Length = Length;
Context.PBytesTransferred = PBytesTransferred;
if (L'\0' != FileNode->FileName[1])
{
/* if this is not the root directory add the dot entries */
ParentNode = MemfsFileNodeMapGetParent(Memfs->FileNodeMap, FileNode->FileName, &Result);
if (0 == ParentNode)
return Result;
if (0 == Marker)
{
if (!AddDirInfo(FileNode, L".", Buffer, Length, PBytesTransferred))
return STATUS_SUCCESS;
}
if (0 == Marker || (L'.' == Marker[0] && L'\0' == Marker[1]))
{
if (!AddDirInfo(ParentNode, L"..", Buffer, Length, PBytesTransferred))
return STATUS_SUCCESS;
Marker = 0;
}
}
if (MemfsFileNodeMapEnumerateChildren(Memfs->FileNodeMap, FileNode, Marker,
ReadDirectoryEnumFn, &Context))
FspFileSystemAddDirInfo(0, Buffer, Length, PBytesTransferred);
#ifdef MEMFS_SLOWIO
if (SlowioReturnPending(FileSystem))
{
try
{
InterlockedIncrement(&Memfs->SlowioThreadsRunning);
std::thread(SlowioReadDirectoryThread,
FileSystem, *PBytesTransferred,
FspFileSystemGetOperationContext()->Request->Hint).
detach();
return STATUS_PENDING;
}
catch (...)
{
InterlockedDecrement(&Memfs->SlowioThreadsRunning);
}
}
SlowioSnooze(FileSystem);
#endif
return STATUS_SUCCESS;
}
#if defined(MEMFS_DIRINFO_BY_NAME)
static NTSTATUS GetDirInfoByName(FSP_FILE_SYSTEM *FileSystem,
PVOID ParentNode0, PWSTR FileName,
FSP_FSCTL_DIR_INFO *DirInfo)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *ParentNode = (MEMFS_FILE_NODE *)ParentNode0;
MEMFS_FILE_NODE *FileNode;
WCHAR FileNameBuf[MEMFS_MAX_PATH];
size_t ParentLength, BSlashLength, FileNameLength;
WCHAR Root[2] = L"\\";
PWSTR Remain, Suffix;
ParentLength = wcslen(ParentNode->FileName);
BSlashLength = 1 < ParentLength;
FileNameLength = wcslen(FileName);
if (MEMFS_MAX_PATH <= ParentLength + BSlashLength + FileNameLength)
return STATUS_OBJECT_NAME_NOT_FOUND; //STATUS_OBJECT_NAME_INVALID?
memcpy(FileNameBuf, ParentNode->FileName, ParentLength * sizeof(WCHAR));
memcpy(FileNameBuf + ParentLength, L"\\", BSlashLength * sizeof(WCHAR));
memcpy(FileNameBuf + ParentLength + BSlashLength, FileName, (FileNameLength + 1) * sizeof(WCHAR));
FileName = FileNameBuf;
FileNode = MemfsFileNodeMapGet(Memfs->FileNodeMap, FileName);
if (0 == FileNode)
return STATUS_OBJECT_NAME_NOT_FOUND;
FspPathSuffix(FileNode->FileName, &Remain, &Suffix, Root);
FileName = Suffix;
FspPathCombine(FileNode->FileName, Suffix);
//memset(DirInfo->Padding, 0, sizeof DirInfo->Padding);
DirInfo->Size = (UINT16)(sizeof(FSP_FSCTL_DIR_INFO) + wcslen(FileName) * sizeof(WCHAR));
DirInfo->FileInfo = FileNode->FileInfo;
memcpy(DirInfo->FileNameBuf, FileName, DirInfo->Size - sizeof(FSP_FSCTL_DIR_INFO));
return STATUS_SUCCESS;
}
#endif
#if defined(MEMFS_REPARSE_POINTS)
static NTSTATUS ResolveReparsePoints(FSP_FILE_SYSTEM *FileSystem,
PWSTR FileName, UINT32 ReparsePointIndex, BOOLEAN ResolveLastPathComponent,
PIO_STATUS_BLOCK PIoStatus, PVOID Buffer, PSIZE_T PSize)
{
return FspFileSystemResolveReparsePoints(FileSystem, GetReparsePointByName, 0,
FileName, ReparsePointIndex, ResolveLastPathComponent,
PIoStatus, Buffer, PSize);
}
static NTSTATUS GetReparsePointByName(
FSP_FILE_SYSTEM *FileSystem, PVOID Context,
PWSTR FileName, BOOLEAN IsDirectory, PVOID Buffer, PSIZE_T PSize)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode;
#if defined(MEMFS_NAMED_STREAMS)
/* GetReparsePointByName will never receive a named stream */
assert(0 == wcschr(FileName, L':'));
#endif
FileNode = MemfsFileNodeMapGet(Memfs->FileNodeMap, FileName);
if (0 == FileNode)
return STATUS_OBJECT_NAME_NOT_FOUND;
if (0 == (FileNode->FileInfo.FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT))
return STATUS_NOT_A_REPARSE_POINT;
if (0 != Buffer)
{
if (FileNode->ReparseDataSize > *PSize)
return STATUS_BUFFER_TOO_SMALL;
*PSize = FileNode->ReparseDataSize;
memcpy(Buffer, FileNode->ReparseData, FileNode->ReparseDataSize);
}
return STATUS_SUCCESS;
}
static NTSTATUS GetReparsePoint(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
PWSTR FileName, PVOID Buffer, PSIZE_T PSize)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
if (0 == (FileNode->FileInfo.FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT))
return STATUS_NOT_A_REPARSE_POINT;
if (FileNode->ReparseDataSize > *PSize)
return STATUS_BUFFER_TOO_SMALL;
*PSize = FileNode->ReparseDataSize;
memcpy(Buffer, FileNode->ReparseData, FileNode->ReparseDataSize);
return STATUS_SUCCESS;
}
static NTSTATUS SetReparsePoint(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
PWSTR FileName, PVOID Buffer, SIZE_T Size)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
PVOID ReparseData;
NTSTATUS Result;
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
if (MemfsFileNodeMapHasChild(Memfs->FileNodeMap, FileNode))
return STATUS_DIRECTORY_NOT_EMPTY;
if (0 != FileNode->ReparseData)
{
Result = FspFileSystemCanReplaceReparsePoint(
FileNode->ReparseData, FileNode->ReparseDataSize,
Buffer, Size);
if (!NT_SUCCESS(Result))
return Result;
}
ReparseData = realloc(FileNode->ReparseData, Size);
if (0 == ReparseData && 0 != Size)
return STATUS_INSUFFICIENT_RESOURCES;
FileNode->FileInfo.FileAttributes |= FILE_ATTRIBUTE_REPARSE_POINT;
FileNode->FileInfo.ReparseTag = *(PULONG)Buffer;
/* the first field in a reparse buffer is the reparse tag */
FileNode->ReparseDataSize = Size;
FileNode->ReparseData = ReparseData;
memcpy(FileNode->ReparseData, Buffer, Size);
return STATUS_SUCCESS;
}
static NTSTATUS DeleteReparsePoint(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
PWSTR FileName, PVOID Buffer, SIZE_T Size)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
NTSTATUS Result;
#if defined(MEMFS_NAMED_STREAMS)
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
#endif
if (0 != FileNode->ReparseData)
{
Result = FspFileSystemCanReplaceReparsePoint(
FileNode->ReparseData, FileNode->ReparseDataSize,
Buffer, Size);
if (!NT_SUCCESS(Result))
return Result;
}
else
return STATUS_NOT_A_REPARSE_POINT;
free(FileNode->ReparseData);
FileNode->FileInfo.FileAttributes &= ~FILE_ATTRIBUTE_REPARSE_POINT;
FileNode->FileInfo.ReparseTag = 0;
FileNode->ReparseDataSize = 0;
FileNode->ReparseData = 0;
return STATUS_SUCCESS;
}
#endif
#if defined(MEMFS_NAMED_STREAMS)
typedef struct _MEMFS_GET_STREAM_INFO_CONTEXT
{
PVOID Buffer;
ULONG Length;
PULONG PBytesTransferred;
} MEMFS_GET_STREAM_INFO_CONTEXT;
static BOOLEAN AddStreamInfo(MEMFS_FILE_NODE *FileNode,
PVOID Buffer, ULONG Length, PULONG PBytesTransferred)
{
UINT8 StreamInfoBuf[sizeof(FSP_FSCTL_STREAM_INFO) + sizeof FileNode->FileName];
FSP_FSCTL_STREAM_INFO *StreamInfo = (FSP_FSCTL_STREAM_INFO *)StreamInfoBuf;
PWSTR StreamName;
StreamName = wcschr(FileNode->FileName, L':');
if (0 != StreamName)
StreamName++;
else
StreamName = L"";
StreamInfo->Size = (UINT16)(sizeof(FSP_FSCTL_STREAM_INFO) + wcslen(StreamName) * sizeof(WCHAR));
StreamInfo->StreamSize = FileNode->FileInfo.FileSize;
StreamInfo->StreamAllocationSize = FileNode->FileInfo.AllocationSize;
memcpy(StreamInfo->StreamNameBuf, StreamName, StreamInfo->Size - sizeof(FSP_FSCTL_STREAM_INFO));
return FspFileSystemAddStreamInfo(StreamInfo, Buffer, Length, PBytesTransferred);
}
static BOOLEAN GetStreamInfoEnumFn(MEMFS_FILE_NODE *FileNode, PVOID Context0)
{
MEMFS_GET_STREAM_INFO_CONTEXT *Context = (MEMFS_GET_STREAM_INFO_CONTEXT *)Context0;
return AddStreamInfo(FileNode,
Context->Buffer, Context->Length, Context->PBytesTransferred);
}
static NTSTATUS GetStreamInfo(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0, PVOID Buffer, ULONG Length,
PULONG PBytesTransferred)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
MEMFS_GET_STREAM_INFO_CONTEXT Context;
if (0 != FileNode->MainFileNode)
FileNode = FileNode->MainFileNode;
Context.Buffer = Buffer;
Context.Length = Length;
Context.PBytesTransferred = PBytesTransferred;
if (0 == (FileNode->FileInfo.FileAttributes & FILE_ATTRIBUTE_DIRECTORY) &&
!AddStreamInfo(FileNode, Buffer, Length, PBytesTransferred))
return STATUS_SUCCESS;
if (MemfsFileNodeMapEnumerateNamedStreams(Memfs->FileNodeMap, FileNode, GetStreamInfoEnumFn, &Context))
FspFileSystemAddStreamInfo(0, Buffer, Length, PBytesTransferred);
/* ???: how to handle out of response buffer condition? */
return STATUS_SUCCESS;
}
#endif
#if defined(MEMFS_CONTROL)
static NTSTATUS Control(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode, UINT32 ControlCode,
PVOID InputBuffer, ULONG InputBufferLength,
PVOID OutputBuffer, ULONG OutputBufferLength, PULONG PBytesTransferred)
{
/* MEMFS also supports encryption! See below :) */
if (CTL_CODE(0x8000 + 'M', 'R', METHOD_BUFFERED, FILE_ANY_ACCESS) == ControlCode)
{
if (OutputBufferLength != InputBufferLength)
return STATUS_INVALID_PARAMETER;
for (PUINT8 P = (PUINT8)InputBuffer, Q = (PUINT8)OutputBuffer, EndP = P + InputBufferLength;
EndP > P; P++, Q++)
{
if (('A' <= *P && *P <= 'M') || ('a' <= *P && *P <= 'm'))
*Q = *P + 13;
else
if (('N' <= *P && *P <= 'Z') || ('n' <= *P && *P <= 'z'))
*Q = *P - 13;
else
*Q = *P;
}
*PBytesTransferred = InputBufferLength;
return STATUS_SUCCESS;
}
return STATUS_INVALID_DEVICE_REQUEST;
}
#endif
#if defined(MEMFS_EA)
typedef struct _MEMFS_GET_EA_CONTEXT
{
PFILE_FULL_EA_INFORMATION Ea;
ULONG EaLength;
PULONG PBytesTransferred;
} MEMFS_GET_EA_CONTEXT;
static BOOLEAN GetEaEnumFn(PFILE_FULL_EA_INFORMATION Ea, PVOID Context0)
{
MEMFS_GET_EA_CONTEXT *Context = (MEMFS_GET_EA_CONTEXT *)Context0;
return FspFileSystemAddEa(Ea,
Context->Ea, Context->EaLength, Context->PBytesTransferred);
}
static NTSTATUS GetEa(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
PFILE_FULL_EA_INFORMATION Ea, ULONG EaLength, PULONG PBytesTransferred)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
MEMFS_GET_EA_CONTEXT Context;
Context.Ea = Ea;
Context.EaLength = EaLength;
Context.PBytesTransferred = PBytesTransferred;
if (MemfsFileNodeEnumerateEa(FileNode, GetEaEnumFn, &Context))
FspFileSystemAddEa(0, Ea, EaLength, PBytesTransferred);
return STATUS_SUCCESS;
}
static NTSTATUS SetEa(FSP_FILE_SYSTEM *FileSystem,
PVOID FileNode0,
PFILE_FULL_EA_INFORMATION Ea, ULONG EaLength,
FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
NTSTATUS Result;
Result = FspFileSystemEnumerateEa(FileSystem, MemfsFileNodeSetEa, FileNode, Ea, EaLength);
if (!NT_SUCCESS(Result))
return Result;
MemfsFileNodeGetFileInfo(FileNode, FileInfo);
return STATUS_SUCCESS;
}
#endif
static FSP_FILE_SYSTEM_INTERFACE MemfsInterface =
{
GetVolumeInfo,
SetVolumeLabel,
GetSecurityByName,
#if defined(MEMFS_EA) || defined(MEMFS_WSL)
0,
#else
Create,
#endif
Open,
#if defined(MEMFS_EA)
0,
#else
Overwrite,
#endif
Cleanup,
Close,
Read,
Write,
Flush,
GetFileInfo,
SetBasicInfo,
SetFileSize,
CanDelete,
Rename,
GetSecurity,
SetSecurity,
ReadDirectory,
#if defined(MEMFS_REPARSE_POINTS)
ResolveReparsePoints,
GetReparsePoint,
SetReparsePoint,
DeleteReparsePoint,
#else
0,
0,
0,
0,
#endif
#if defined(MEMFS_NAMED_STREAMS)
GetStreamInfo,
#else
0,
#endif
#if defined(MEMFS_DIRINFO_BY_NAME)
GetDirInfoByName,
#else
0,
#endif
#if defined(MEMFS_CONTROL)
Control,
#else
0,
#endif
0,
#if defined(MEMFS_EA) || defined(MEMFS_WSL)
Create,
#endif
#if defined(MEMFS_EA)
Overwrite,
GetEa,
SetEa,
#else
0,
0,
0,
#endif
};
/*
* Public API
*/
NTSTATUS MemfsCreateFunnel(
ULONG Flags,
ULONG FileInfoTimeout,
ULONG MaxFileNodes,
ULONG MaxFileSize,
ULONG SlowioMaxDelay,
ULONG SlowioPercentDelay,
ULONG SlowioRarefyDelay,
PWSTR FileSystemName,
PWSTR VolumePrefix,
PWSTR RootSddl,
MEMFS **PMemfs)
{
NTSTATUS Result;
FSP_FSCTL_VOLUME_PARAMS VolumeParams;
BOOLEAN CaseInsensitive = !!(Flags & MemfsCaseInsensitive);
BOOLEAN FlushAndPurgeOnCleanup = !!(Flags & MemfsFlushAndPurgeOnCleanup);
BOOLEAN SupportsPosixUnlinkRename = !(Flags & MemfsLegacyUnlinkRename);
PWSTR DevicePath = MemfsNet == (Flags & MemfsDeviceMask) ?
L"" FSP_FSCTL_NET_DEVICE_NAME : L"" FSP_FSCTL_DISK_DEVICE_NAME;
UINT64 AllocationUnit;
MEMFS *Memfs;
MEMFS_FILE_NODE *RootNode;
PSECURITY_DESCRIPTOR RootSecurity;
ULONG RootSecuritySize;
BOOLEAN Inserted;
*PMemfs = 0;
Result = MemfsHeapConfigure(0, 0, 0);
if (!NT_SUCCESS(Result))
return Result;
if (0 == RootSddl)
RootSddl = L"O:BAG:BAD:P(A;;FA;;;SY)(A;;FA;;;BA)(A;;FA;;;WD)";
if (!ConvertStringSecurityDescriptorToSecurityDescriptorW(RootSddl, SDDL_REVISION_1,
&RootSecurity, &RootSecuritySize))
return FspNtStatusFromWin32(GetLastError());
Memfs = (MEMFS *)malloc(sizeof *Memfs);
if (0 == Memfs)
{
LocalFree(RootSecurity);
return STATUS_INSUFFICIENT_RESOURCES;
}
memset(Memfs, 0, sizeof *Memfs);
Memfs->MaxFileNodes = MaxFileNodes;
AllocationUnit = MEMFS_SECTOR_SIZE * MEMFS_SECTORS_PER_ALLOCATION_UNIT;
Memfs->MaxFileSize = (ULONG)((MaxFileSize + AllocationUnit - 1) / AllocationUnit * AllocationUnit);
#ifdef MEMFS_SLOWIO
Memfs->SlowioMaxDelay = SlowioMaxDelay;
Memfs->SlowioPercentDelay = SlowioPercentDelay;
Memfs->SlowioRarefyDelay = SlowioRarefyDelay;
#endif
Result = MemfsFileNodeMapCreate(CaseInsensitive, &Memfs->FileNodeMap);
if (!NT_SUCCESS(Result))
{
free(Memfs);
LocalFree(RootSecurity);
return Result;
}
memset(&VolumeParams, 0, sizeof VolumeParams);
VolumeParams.Version = sizeof FSP_FSCTL_VOLUME_PARAMS;
VolumeParams.SectorSize = MEMFS_SECTOR_SIZE;
VolumeParams.SectorsPerAllocationUnit = MEMFS_SECTORS_PER_ALLOCATION_UNIT;
VolumeParams.VolumeCreationTime = MemfsGetSystemTime();
VolumeParams.VolumeSerialNumber = (UINT32)(MemfsGetSystemTime() / (10000 * 1000));
VolumeParams.FileInfoTimeout = FileInfoTimeout;
VolumeParams.CaseSensitiveSearch = !CaseInsensitive;
VolumeParams.CasePreservedNames = 1;
VolumeParams.UnicodeOnDisk = 1;
VolumeParams.PersistentAcls = 1;
VolumeParams.ReparsePoints = 1;
VolumeParams.ReparsePointsAccessCheck = 0;
#if defined(MEMFS_NAMED_STREAMS)
VolumeParams.NamedStreams = 1;
#endif
VolumeParams.PostCleanupWhenModifiedOnly = 1;
VolumeParams.PostDispositionWhenNecessaryOnly = 1;
#if defined(MEMFS_DIRINFO_BY_NAME)
VolumeParams.PassQueryDirectoryFileName = 1;
#endif
VolumeParams.FlushAndPurgeOnCleanup = FlushAndPurgeOnCleanup;
#if defined(MEMFS_CONTROL)
VolumeParams.DeviceControl = 1;
#endif
#if defined(MEMFS_EA)
VolumeParams.ExtendedAttributes = 1;
#endif
#if defined(MEMFS_WSL)
VolumeParams.WslFeatures = 1;
#endif
VolumeParams.AllowOpenInKernelMode = 1;
#if defined(MEMFS_REJECT_EARLY_IRP)
VolumeParams.RejectIrpPriorToTransact0 = 1;
#endif
VolumeParams.SupportsPosixUnlinkRename = SupportsPosixUnlinkRename;
if (0 != VolumePrefix)
wcscpy_s(VolumeParams.Prefix, sizeof VolumeParams.Prefix / sizeof(WCHAR), VolumePrefix);
wcscpy_s(VolumeParams.FileSystemName, sizeof VolumeParams.FileSystemName / sizeof(WCHAR),
0 != FileSystemName ? FileSystemName : L"-MEMFS");
Result = FspFileSystemCreate(DevicePath, &VolumeParams, &MemfsInterface, &Memfs->FileSystem);
if (!NT_SUCCESS(Result))
{
MemfsFileNodeMapDelete(Memfs->FileNodeMap);
free(Memfs);
LocalFree(RootSecurity);
return Result;
}
Memfs->FileSystem->UserContext = Memfs;
Memfs->VolumeLabelLength = sizeof L"MEMFS" - sizeof(WCHAR);
memcpy(Memfs->VolumeLabel, L"MEMFS", Memfs->VolumeLabelLength);
#if 0
FspFileSystemSetOperationGuardStrategy(Memfs->FileSystem,
FSP_FILE_SYSTEM_OPERATION_GUARD_STRATEGY_COARSE);
#endif
/*
* Create root directory.
*/
Result = MemfsFileNodeCreate(L"\\", &RootNode);
if (!NT_SUCCESS(Result))
{
MemfsDelete(Memfs);
LocalFree(RootSecurity);
return Result;
}
RootNode->FileInfo.FileAttributes = FILE_ATTRIBUTE_DIRECTORY;
RootNode->FileSecurity = malloc(RootSecuritySize);
if (0 == RootNode->FileSecurity)
{
MemfsFileNodeDelete(RootNode);
MemfsDelete(Memfs);
LocalFree(RootSecurity);
return STATUS_INSUFFICIENT_RESOURCES;
}
RootNode->FileSecuritySize = RootSecuritySize;
memcpy(RootNode->FileSecurity, RootSecurity, RootSecuritySize);
Result = MemfsFileNodeMapInsert(Memfs->FileNodeMap, RootNode, &Inserted);
if (!NT_SUCCESS(Result))
{
MemfsFileNodeDelete(RootNode);
MemfsDelete(Memfs);
LocalFree(RootSecurity);
return Result;
}
LocalFree(RootSecurity);
*PMemfs = Memfs;
return STATUS_SUCCESS;
}
VOID MemfsDelete(MEMFS *Memfs)
{
FspFileSystemDelete(Memfs->FileSystem);
MemfsFileNodeMapDelete(Memfs->FileNodeMap);
free(Memfs);
}
NTSTATUS MemfsStart(MEMFS *Memfs)
{
#ifdef MEMFS_SLOWIO
Memfs->SlowioThreadsRunning = 0;
#endif
return FspFileSystemStartDispatcher(Memfs->FileSystem, 0);
}
VOID MemfsStop(MEMFS *Memfs)
{
FspFileSystemStopDispatcher(Memfs->FileSystem);
#ifdef MEMFS_SLOWIO
while (Memfs->SlowioThreadsRunning)
Sleep(1);
#endif
}
FSP_FILE_SYSTEM *MemfsFileSystem(MEMFS *Memfs)
{
return Memfs->FileSystem;
}
NTSTATUS MemfsHeapConfigure(SIZE_T InitialSize, SIZE_T MaximumSize, SIZE_T Alignment)
{
return LargeHeapInitialize(0, InitialSize, MaximumSize, LargeHeapAlignment) ?
STATUS_SUCCESS : STATUS_INSUFFICIENT_RESOURCES;
}
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