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tst: memfs: slowio: minor code cleanup

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This commit is contained in:
Bill Zissimopoulos
2017-11-01 18:30:36 -07:00
parent 9be2b7a2b9
commit 0ab35fde1a
3 changed files with 47 additions and 35 deletions
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65
tst/memfs/memfs.cpp
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@@ -21,8 +21,8 @@
#include <VersionHelpers.h>
#include <cassert>
#include <map>
#include <unordered_map>
#include <thread>
#include <unordered_map>
#define MEMFS_MAX_PATH 512
FSP_FSCTL_STATIC_ASSERT(MEMFS_MAX_PATH > MAX_PATH,
@@ -51,7 +51,7 @@ FSP_FSCTL_STATIC_ASSERT(MEMFS_MAX_PATH > MAX_PATH,
/*
* Define the MEMFS_SLOWIO macro to include delayed I/O response support.
*/
//#define MEMFS_SLOWIO
#define MEMFS_SLOWIO
/*
* Define the DEBUG_BUFFER_CHECK macro on Windows 8 or above. This includes
@@ -659,7 +659,6 @@ VOID MemfsFileNodeMapEnumerateFree(MEMFS_FILE_NODE_MAP_ENUM_CONTEXT *Context)
}
#ifdef MEMFS_SLOWIO
/*
* SLOWIO
*
@@ -672,7 +671,7 @@ VOID MemfsFileNodeMapEnumerateFree(MEMFS_FILE_NODE_MAP_ENUM_CONTEXT *Context)
*
*/
inline UINT64 Hash(UINT64 x)
static inline UINT64 Hash(UINT64 x)
{
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9ull;
x = (x ^ (x >> 27)) * 0x94d049bb133111ebull;
@@ -680,24 +679,25 @@ inline UINT64 Hash(UINT64 x)
return x;
}
unsigned int PseudoRandom(unsigned int to)
static inline UINT32 PseudoRandom(UINT32 to)
{
static UINT64 spin = 0;
InterlockedIncrement(&spin);
return Hash(spin) % to;
}
int SlowioReturnPending(FSP_FILE_SYSTEM *FileSystem)
static inline UINT32 SlowioMillisecondsOfDelay(FSP_FILE_SYSTEM *FileSystem)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
return PseudoRandom(100) < Memfs->SlowioPercentDelay;
return 0 != Memfs->SlowioMaxDelay ?
PseudoRandom(Memfs->SlowioMaxDelay + 1) >> PseudoRandom(Memfs->SlowioRarefyDelay + 1) : 0;
}
int SlowioMillisecondsOfDelay(FSP_FILE_SYSTEM *FileSystem)
static inline bool SlowioReturnPending(FSP_FILE_SYSTEM *FileSystem)
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
int milliseconds = PseudoRandom(Memfs->SlowioMaxDelay+1) >> PseudoRandom(Memfs->SlowioRarefyDelay+1);
return milliseconds;
return 0 != Memfs->SlowioMaxDelay &&
PseudoRandom(100) < Memfs->SlowioPercentDelay;
}
void SlowioReadThread(
@@ -710,8 +710,8 @@ void SlowioReadThread(
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
if (UINT32 ms = SlowioMillisecondsOfDelay(FileSystem))
Sleep(ms);
memcpy(Buffer, (PUINT8)FileNode->FileData + Offset, (size_t)(EndOffset - Offset));
UINT32 BytesTransferred = (ULONG)(EndOffset - Offset);
@@ -723,7 +723,6 @@ void SlowioReadThread(
ResponseBuf.Hint = RequestHint; // IRP that is being completed
ResponseBuf.IoStatus.Status = STATUS_SUCCESS;
ResponseBuf.IoStatus.Information = BytesTransferred; // bytes read
FspFileSystemSendResponse(FileSystem, &ResponseBuf);
InterlockedDecrement(&Memfs->SlowioThreadsRunning);
@@ -740,8 +739,8 @@ void SlowioWriteThread(
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
if (UINT32 ms = SlowioMillisecondsOfDelay(FileSystem))
Sleep(ms);
memcpy((PUINT8)FileNode->FileData + Offset, Buffer, (size_t)(EndOffset - Offset));
UINT32 BytesTransferred = (ULONG)(EndOffset - Offset);
@@ -754,7 +753,6 @@ void SlowioWriteThread(
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(&Memfs->SlowioThreadsRunning);
@@ -767,8 +765,8 @@ void SlowioReadDirectoryThread(
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
if (UINT32 ms = SlowioMillisecondsOfDelay(FileSystem))
Sleep(ms);
FSP_FSCTL_TRANSACT_RSP ResponseBuf;
memset(&ResponseBuf, 0, sizeof ResponseBuf);
@@ -777,7 +775,6 @@ void SlowioReadDirectoryThread(
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(&Memfs->SlowioThreadsRunning);
@@ -1168,8 +1165,6 @@ static NTSTATUS Read(FSP_FILE_SYSTEM *FileSystem,
EndOffset = FileNode->FileInfo.FileSize;
#ifdef MEMFS_SLOWIO
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
if (SlowioReturnPending(FileSystem))
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
@@ -1177,7 +1172,8 @@ static NTSTATUS Read(FSP_FILE_SYSTEM *FileSystem,
UINT64 RequestHint = Request->Hint;
InterlockedIncrement(&Memfs->SlowioThreadsRunning);
try {
auto Thread = std::thread(SlowioReadThread, FileSystem, FileNode, Buffer, Offset, EndOffset, RequestHint);
auto Thread = std::thread(SlowioReadThread,
FileSystem, FileNode, Buffer, Offset, EndOffset, RequestHint);
Thread.detach();
}
catch (...)
@@ -1188,6 +1184,8 @@ static NTSTATUS Read(FSP_FILE_SYSTEM *FileSystem,
return STATUS_PENDING;
}
regular:
if (UINT32 ms = SlowioMillisecondsOfDelay(FileSystem))
Sleep(ms);
#endif
memcpy(Buffer, (PUINT8)FileNode->FileData + Offset, (size_t)(EndOffset - Offset));
@@ -1244,8 +1242,6 @@ static NTSTATUS Write(FSP_FILE_SYSTEM *FileSystem,
}
#ifdef MEMFS_SLOWIO
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
if (SlowioReturnPending(FileSystem))
{
MEMFS *Memfs = (MEMFS *)FileSystem->UserContext;
@@ -1253,7 +1249,8 @@ static NTSTATUS Write(FSP_FILE_SYSTEM *FileSystem,
UINT64 RequestHint = Request->Hint;
InterlockedIncrement(&Memfs->SlowioThreadsRunning);
try {
auto Thread = std::thread(SlowioWriteThread, FileSystem, FileNode, Buffer, Offset, EndOffset, RequestHint, FileInfo);
auto Thread = std::thread(SlowioWriteThread,
FileSystem, FileNode, Buffer, Offset, EndOffset, RequestHint, FileInfo);
Thread.detach();
}
catch (...)
@@ -1264,6 +1261,8 @@ static NTSTATUS Write(FSP_FILE_SYSTEM *FileSystem,
return STATUS_PENDING;
}
regular:
if (UINT32 ms = SlowioMillisecondsOfDelay(FileSystem))
Sleep(ms);
#endif
memcpy((PUINT8)FileNode->FileData + Offset, Buffer, (size_t)(EndOffset - Offset));
@@ -1636,15 +1635,14 @@ static NTSTATUS ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
FspFileSystemAddDirInfo(0, Buffer, Length, PBytesTransferred);
#ifdef MEMFS_SLOWIO
int ms = SlowioMillisecondsOfDelay(FileSystem);
if (ms) Sleep(ms);
if (SlowioReturnPending(FileSystem))
{
FSP_FSCTL_TRANSACT_REQ *Request = FspFileSystemGetOperationContext()->Request;
UINT64 RequestHint = Request->Hint;
InterlockedIncrement(&Memfs->SlowioThreadsRunning);
try {
auto Thread = std::thread(SlowioReadDirectoryThread, FileSystem, *PBytesTransferred, RequestHint);
auto Thread = std::thread(SlowioReadDirectoryThread,
FileSystem, *PBytesTransferred, RequestHint);
Thread.detach();
}
catch (...)
@@ -1655,6 +1653,8 @@ static NTSTATUS ReadDirectory(FSP_FILE_SYSTEM *FileSystem,
return STATUS_PENDING;
}
regular:
if (UINT32 ms = SlowioMillisecondsOfDelay(FileSystem))
Sleep(ms);
#endif
return STATUS_SUCCESS;
@@ -2003,9 +2003,9 @@ NTSTATUS MemfsCreateFunnel(
Memfs->MaxFileSize = (ULONG)((MaxFileSize + AllocationUnit - 1) / AllocationUnit * AllocationUnit);
#ifdef MEMFS_SLOWIO
Memfs->SlowioMaxDelay = SlowioMaxDelay;
Memfs->SlowioPercentDelay = SlowioPercentDelay;
Memfs->SlowioRarefyDelay = SlowioRarefyDelay;
Memfs->SlowioMaxDelay = SlowioMaxDelay;
Memfs->SlowioPercentDelay = SlowioPercentDelay;
Memfs->SlowioRarefyDelay = SlowioRarefyDelay;
#endif
Result = MemfsFileNodeMapCreate(CaseInsensitive, &Memfs->FileNodeMap);
@@ -2122,7 +2122,8 @@ VOID MemfsStop(MEMFS *Memfs)
FspFileSystemStopDispatcher(Memfs->FileSystem);
#ifdef MEMFS_SLOWIO
while (Memfs->SlowioThreadsRunning) Sleep(1);
while (Memfs->SlowioThreadsRunning)
Sleep(1);
#endif
}