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https://github.com/winfsp/winfsp.git
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Update memfs.cpp
This commit is contained in:
John Oberschelp
GitHub
parent
3ede1a5c70
commit
0da43fe2d4
@ -22,6 +22,7 @@
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#include <cassert>
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#include <map>
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#include <unordered_map>
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#include <thread>
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#define MEMFS_MAX_PATH 512
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FSP_FSCTL_STATIC_ASSERT(MEMFS_MAX_PATH > MAX_PATH,
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@ -270,6 +271,11 @@ typedef struct _MEMFS
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MEMFS_FILE_NODE_MAP *FileNodeMap;
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ULONG MaxFileNodes;
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ULONG MaxFileSize;
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ULONG SlowioMaxDelay;
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ULONG SlowioPercentDelay;
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ULONG SlowioRarefyDelay;
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UINT16 VolumeLabelLength;
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WCHAR VolumeLabel[32];
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} MEMFS;
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@ -635,6 +641,147 @@ VOID MemfsFileNodeMapEnumerateFree(MEMFS_FILE_NODE_MAP_ENUM_CONTEXT *Context)
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free(Context->FileNodes);
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}
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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/*
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*
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* Slowio is included for two uses:
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*
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* 1) For testing winfsp, by allowing memfs to act more like a non-ram file system,
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* with some slow IO taking many milliseconds, and some IO completion delayed.
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*
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* 2) As sample code for how to use winfsp's STATUS_PENDING capabilities.
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*
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* If you aren't testing winfsp, leave SlowioMaxDelay at 0.
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*
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*/
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inline uint64_t hash(uint64_t x)
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{
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x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9ull;
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x = (x ^ (x >> 27)) * 0x94d049bb133111ebull;
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x = x ^ (x >> 31);
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return x;
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}
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unsigned int pseudoRandom(unsigned int to)
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{
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static uint64_t spin = 1;
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return hash(spin++) % to;
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}
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int SlowioShouldPostpone(FSP_FILE_SYSTEM *FileSystem)
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{
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MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
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return pseudoRandom(100) < Memfs->SlowioPercentDelay;
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}
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int SlowioMillisecondsOfDelay(FSP_FILE_SYSTEM *FileSystem)
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{
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MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
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if ( ! Memfs->SlowioMaxDelay ) return 0;
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int milliseconds = pseudoRandom(Memfs->SlowioMaxDelay) >> pseudoRandom(Memfs->SlowioRarefyDelay);
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return milliseconds;
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}
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volatile LONG ioThreadsRunning;
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//////////////////////////////////////////////////////////////////////
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void readThread(
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FSP_FILE_SYSTEM *FileSystem,
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MEMFS_FILE_NODE *FileNode,
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PVOID Buffer,
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UINT64 Offset,
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UINT64 EndOffset,
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UINT64 RequestHint)
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{
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InterlockedIncrement(&ioThreadsRunning);
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int ms = SlowioMillisecondsOfDelay(FileSystem);
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if (ms) std::this_thread::sleep_for(std::chrono::milliseconds(ms));
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memcpy(Buffer, (PUINT8)FileNode->FileData + Offset, (size_t)(EndOffset - Offset));
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UINT32 BytesTransferred = (ULONG)(EndOffset - Offset);
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FSP_FSCTL_TRANSACT_RSP ResponseBuf;
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memset(&ResponseBuf, 0, sizeof ResponseBuf);
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ResponseBuf.Size = sizeof ResponseBuf;
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ResponseBuf.Kind = FspFsctlTransactReadKind;
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ResponseBuf.Hint = RequestHint; // IRP that is being completed
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ResponseBuf.IoStatus.Status = STATUS_SUCCESS;
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ResponseBuf.IoStatus.Information = BytesTransferred; // bytes read
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FspFileSystemSendResponse(FileSystem, &ResponseBuf);
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InterlockedDecrement(&ioThreadsRunning);
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}
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//////////////////////////////////////////////////////////////////////
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void writeThread(
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FSP_FILE_SYSTEM *FileSystem,
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MEMFS_FILE_NODE *FileNode,
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PVOID Buffer,
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UINT64 Offset,
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UINT64 EndOffset,
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UINT64 RequestHint,
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FSP_FSCTL_FILE_INFO *FileInfo)
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{
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InterlockedIncrement(&ioThreadsRunning);
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int ms = SlowioMillisecondsOfDelay(FileSystem);
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if (ms) std::this_thread::sleep_for(std::chrono::milliseconds(ms));
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memcpy((PUINT8)FileNode->FileData + Offset, Buffer, (size_t)(EndOffset - Offset));
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UINT32 BytesTransferred = (ULONG)(EndOffset - Offset);
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FSP_FSCTL_TRANSACT_RSP ResponseBuf;
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memset(&ResponseBuf, 0, sizeof ResponseBuf);
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ResponseBuf.Size = sizeof ResponseBuf;
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ResponseBuf.Kind = FspFsctlTransactWriteKind;
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ResponseBuf.Hint = RequestHint; // IRP that is being completed
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ResponseBuf.IoStatus.Status = STATUS_SUCCESS;
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ResponseBuf.IoStatus.Information = BytesTransferred; // bytes written
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ResponseBuf.Rsp.Write.FileInfo = *FileInfo; // FileInfo of file after Write
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FspFileSystemSendResponse(FileSystem, &ResponseBuf);
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InterlockedDecrement(&ioThreadsRunning);
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}
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//////////////////////////////////////////////////////////////////////
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void readDirectoryThread(
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FSP_FILE_SYSTEM *FileSystem,
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PVOID Buffer,
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MEMFS *Memfs,
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PWSTR Marker,
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ULONG BytesTransferred,
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UINT64 RequestHint)
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{
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InterlockedIncrement(&ioThreadsRunning);
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int ms = SlowioMillisecondsOfDelay(FileSystem);
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if (ms) std::this_thread::sleep_for(std::chrono::milliseconds(ms));
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FSP_FSCTL_TRANSACT_RSP ResponseBuf;
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memset(&ResponseBuf, 0, sizeof ResponseBuf);
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ResponseBuf.Size = sizeof ResponseBuf;
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ResponseBuf.Kind = FspFsctlTransactQueryDirectoryKind;
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ResponseBuf.Hint = RequestHint; // IRP that is being completed
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ResponseBuf.IoStatus.Status = STATUS_SUCCESS;
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ResponseBuf.IoStatus.Information = BytesTransferred; // bytes of directory info read
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FspFileSystemSendResponse(FileSystem, &ResponseBuf);
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InterlockedDecrement(&ioThreadsRunning);
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}
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//////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////
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/*
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* FSP_FILE_SYSTEM_INTERFACE
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*/
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@ -1018,6 +1165,21 @@ static NTSTATUS Read(FSP_FILE_SYSTEM *FileSystem,
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if (EndOffset > FileNode->FileInfo.FileSize)
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EndOffset = FileNode->FileInfo.FileSize;
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if (SlowioShouldPostpone(FileSystem))
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{
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FSP_FSCTL_TRANSACT_REQ *Request = FspFileSystemGetOperationContext()->Request;
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UINT64 RequestHint = Request->Hint;
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std::thread rt = std::thread(readThread, FileSystem, FileNode, Buffer, Offset, EndOffset, RequestHint);
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rt.detach();
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return STATUS_PENDING;
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}
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int ms = SlowioMillisecondsOfDelay(FileSystem);
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if (ms) Sleep(ms);
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memcpy(Buffer, (PUINT8)FileNode->FileData + Offset, (size_t)(EndOffset - Offset));
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*PBytesTransferred = (ULONG)(EndOffset - Offset);
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@ -1071,6 +1233,21 @@ static NTSTATUS Write(FSP_FILE_SYSTEM *FileSystem,
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}
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}
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if (SlowioShouldPostpone(FileSystem))
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{
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FSP_FSCTL_TRANSACT_REQ *Request = FspFileSystemGetOperationContext()->Request;
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UINT64 RequestHint = Request->Hint;
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std::thread wt = std::thread(writeThread, FileSystem, FileNode, Buffer, Offset, EndOffset, RequestHint, FileInfo);
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wt.detach();
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return STATUS_PENDING;
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}
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int ms = SlowioMillisecondsOfDelay(FileSystem);
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if (ms) Sleep(ms);
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memcpy((PUINT8)FileNode->FileData + Offset, Buffer, (size_t)(EndOffset - Offset));
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*PBytesTransferred = (ULONG)(EndOffset - Offset);
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@ -1438,6 +1615,21 @@ static NTSTATUS ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
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ReadDirectoryEnumFn, &Context))
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FspFileSystemAddDirInfo(0, Buffer, Length, PBytesTransferred);
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if (SlowioShouldPostpone(FileSystem))
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{
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FSP_FSCTL_TRANSACT_REQ *Request = FspFileSystemGetOperationContext()->Request;
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UINT64 RequestHint = Request->Hint;
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std::thread rdt = std::thread(readDirectoryThread, FileSystem, Buffer, Memfs, Marker, *PBytesTransferred, RequestHint);
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rdt.detach();
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return STATUS_PENDING;
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}
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int ms = SlowioMillisecondsOfDelay(FileSystem);
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if (ms) Sleep(ms);
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return STATUS_SUCCESS;
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}
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@ -1692,6 +1884,11 @@ NTSTATUS MemfsCreateFunnel(
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ULONG FileInfoTimeout,
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ULONG MaxFileNodes,
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ULONG MaxFileSize,
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ULONG SlowioMaxDelay,
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ULONG SlowioPercentDelay,
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ULONG SlowioRarefyDelay,
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PWSTR FileSystemName,
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PWSTR VolumePrefix,
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PWSTR RootSddl,
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@ -1733,6 +1930,10 @@ NTSTATUS MemfsCreateFunnel(
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AllocationUnit = MEMFS_SECTOR_SIZE * MEMFS_SECTORS_PER_ALLOCATION_UNIT;
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Memfs->MaxFileSize = (ULONG)((MaxFileSize + AllocationUnit - 1) / AllocationUnit * AllocationUnit);
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Memfs->SlowioMaxDelay = SlowioMaxDelay;
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Memfs->SlowioPercentDelay = SlowioPercentDelay;
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Memfs->SlowioRarefyDelay = SlowioRarefyDelay;
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Result = MemfsFileNodeMapCreate(CaseInsensitive, &Memfs->FileNodeMap);
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if (!NT_SUCCESS(Result))
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{
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@ -1832,11 +2033,15 @@ VOID MemfsDelete(MEMFS *Memfs)
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NTSTATUS MemfsStart(MEMFS *Memfs)
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{
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ioThreadsRunning = 0;
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return FspFileSystemStartDispatcher(Memfs->FileSystem, 0);
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}
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VOID MemfsStop(MEMFS *Memfs)
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{
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while (ioThreadsRunning) Sleep(1);
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FspFileSystemStopDispatcher(Memfs->FileSystem);
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}
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