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Update memfs.cpp

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This commit is contained in:
John Oberschelp
2017-10-09 14:46:24 -07:00
committed by GitHub
parent 3ede1a5c70
commit 0da43fe2d4
1 changed files with 205 additions and 0 deletions
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205
tst/memfs/memfs.cpp
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@@ -22,6 +22,7 @@
#include <cassert>
#include <map>
#include <unordered_map>
#include <thread>
#define MEMFS_MAX_PATH 512
FSP_FSCTL_STATIC_ASSERT(MEMFS_MAX_PATH > MAX_PATH,
@@ -270,6 +271,11 @@ typedef struct _MEMFS
MEMFS_FILE_NODE_MAP *FileNodeMap;
ULONG MaxFileNodes;
ULONG MaxFileSize;
ULONG SlowioMaxDelay;
ULONG SlowioPercentDelay;
ULONG SlowioRarefyDelay;
UINT16 VolumeLabelLength;
WCHAR VolumeLabel[32];
} MEMFS;
@@ -635,6 +641,147 @@ VOID MemfsFileNodeMapEnumerateFree(MEMFS_FILE_NODE_MAP_ENUM_CONTEXT *Context)
free(Context->FileNodes);
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
/*
*
* Slowio is included for two uses:
*
* 1) For testing winfsp, by allowing memfs to act more like a non-ram file system,
* with some slow IO taking many milliseconds, and some IO completion delayed.
*
* 2) As sample code for how to use winfsp's STATUS_PENDING capabilities.
*
* If you aren't testing winfsp, leave SlowioMaxDelay at 0.
*
*/
inline uint64_t hash(uint64_t x)
{
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9ull;
x = (x ^ (x >> 27)) * 0x94d049bb133111ebull;
x = x ^ (x >> 31);
return x;
}
unsigned int pseudoRandom(unsigned int to)
{
static uint64_t spin = 1;
return hash(spin++) % to;
}
int SlowioShouldPostpone(FSP_FILE_SYSTEM *FileSystem)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
return pseudoRandom(100) < Memfs->SlowioPercentDelay;
}
int SlowioMillisecondsOfDelay(FSP_FILE_SYSTEM *FileSystem)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
if ( ! Memfs->SlowioMaxDelay ) return 0;
int milliseconds = pseudoRandom(Memfs->SlowioMaxDelay) >> pseudoRandom(Memfs->SlowioRarefyDelay);
return milliseconds;
}
volatile LONG ioThreadsRunning;
//////////////////////////////////////////////////////////////////////
void readThread(
FSP_FILE_SYSTEM *FileSystem,
MEMFS_FILE_NODE *FileNode,
PVOID Buffer,
UINT64 Offset,
UINT64 EndOffset,
UINT64 RequestHint)
{
InterlockedIncrement(&ioThreadsRunning);
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) std::this_thread::sleep_for(std::chrono::milliseconds(ms));
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);
InterlockedDecrement(&ioThreadsRunning);
}
//////////////////////////////////////////////////////////////////////
void writeThread(
FSP_FILE_SYSTEM *FileSystem,
MEMFS_FILE_NODE *FileNode,
PVOID Buffer,
UINT64 Offset,
UINT64 EndOffset,
UINT64 RequestHint,
FSP_FSCTL_FILE_INFO *FileInfo)
{
InterlockedIncrement(&ioThreadsRunning);
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) std::this_thread::sleep_for(std::chrono::milliseconds(ms));
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
ResponseBuf.Rsp.Write.FileInfo = *FileInfo; // FileInfo of file after Write
FspFileSystemSendResponse(FileSystem, &ResponseBuf);
InterlockedDecrement(&ioThreadsRunning);
}
//////////////////////////////////////////////////////////////////////
void readDirectoryThread(
FSP_FILE_SYSTEM *FileSystem,
PVOID Buffer,
MEMFS *Memfs,
PWSTR Marker,
ULONG BytesTransferred,
UINT64 RequestHint)
{
InterlockedIncrement(&ioThreadsRunning);
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) std::this_thread::sleep_for(std::chrono::milliseconds(ms));
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);
InterlockedDecrement(&ioThreadsRunning);
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
/*
* FSP_FILE_SYSTEM_INTERFACE
*/
@@ -1018,6 +1165,21 @@ static NTSTATUS Read(FSP_FILE_SYSTEM *FileSystem,
if (EndOffset > FileNode->FileInfo.FileSize)
EndOffset = FileNode->FileInfo.FileSize;
if (SlowioShouldPostpone(FileSystem))
{
FSP_FSCTL_TRANSACT_REQ *Request = FspFileSystemGetOperationContext()->Request;
UINT64 RequestHint = Request->Hint;
std::thread rt = std::thread(readThread, FileSystem, FileNode, Buffer, Offset, EndOffset, RequestHint);
rt.detach();
return STATUS_PENDING;
}
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
memcpy(Buffer, (PUINT8)FileNode->FileData + Offset, (size_t)(EndOffset - Offset));
*PBytesTransferred = (ULONG)(EndOffset - Offset);
@@ -1071,6 +1233,21 @@ static NTSTATUS Write(FSP_FILE_SYSTEM *FileSystem,
}
}
if (SlowioShouldPostpone(FileSystem))
{
FSP_FSCTL_TRANSACT_REQ *Request = FspFileSystemGetOperationContext()->Request;
UINT64 RequestHint = Request->Hint;
std::thread wt = std::thread(writeThread, FileSystem, FileNode, Buffer, Offset, EndOffset, RequestHint, FileInfo);
wt.detach();
return STATUS_PENDING;
}
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
memcpy((PUINT8)FileNode->FileData + Offset, Buffer, (size_t)(EndOffset - Offset));
*PBytesTransferred = (ULONG)(EndOffset - Offset);
@@ -1438,6 +1615,21 @@ static NTSTATUS ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
ReadDirectoryEnumFn, &Context))
FspFileSystemAddDirInfo(0, Buffer, Length, PBytesTransferred);
if (SlowioShouldPostpone(FileSystem))
{
FSP_FSCTL_TRANSACT_REQ *Request = FspFileSystemGetOperationContext()->Request;
UINT64 RequestHint = Request->Hint;
std::thread rdt = std::thread(readDirectoryThread, FileSystem, Buffer, Memfs, Marker, *PBytesTransferred, RequestHint);
rdt.detach();
return STATUS_PENDING;
}
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
return STATUS_SUCCESS;
}
@@ -1692,6 +1884,11 @@ NTSTATUS MemfsCreateFunnel(
ULONG FileInfoTimeout,
ULONG MaxFileNodes,
ULONG MaxFileSize,
ULONG SlowioMaxDelay,
ULONG SlowioPercentDelay,
ULONG SlowioRarefyDelay,
PWSTR FileSystemName,
PWSTR VolumePrefix,
PWSTR RootSddl,
@@ -1733,6 +1930,10 @@ NTSTATUS MemfsCreateFunnel(
AllocationUnit = MEMFS_SECTOR_SIZE * MEMFS_SECTORS_PER_ALLOCATION_UNIT;
Memfs->MaxFileSize = (ULONG)((MaxFileSize + AllocationUnit - 1) / AllocationUnit * AllocationUnit);
Memfs->SlowioMaxDelay = SlowioMaxDelay;
Memfs->SlowioPercentDelay = SlowioPercentDelay;
Memfs->SlowioRarefyDelay = SlowioRarefyDelay;
Result = MemfsFileNodeMapCreate(CaseInsensitive, &Memfs->FileNodeMap);
if (!NT_SUCCESS(Result))
{
@@ -1832,11 +2033,15 @@ VOID MemfsDelete(MEMFS *Memfs)
NTSTATUS MemfsStart(MEMFS *Memfs)
{
ioThreadsRunning = 0;
return FspFileSystemStartDispatcher(Memfs->FileSystem, 0);
}
VOID MemfsStop(MEMFS *Memfs)
{
while (ioThreadsRunning) Sleep(1);
FspFileSystemStopDispatcher(Memfs->FileSystem);
}