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Add asynchronous I/O testing to memfs-dotnet.

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Make SeekableReadDirectory virtual, so that it can be overridden.
This commit is contained in:
Felix A. Croes 2019-06-04 15:58:54 +02:00
parent af7e5432a7
commit 879fa2464f
2 changed files with 162 additions and 4 deletions
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2
src/dotnet/FileSystemBase.cs
View File

@ -1291,7 +1291,7 @@ namespace Fsp
ModificationDescriptor,
ref ModifiedDescriptor);
}
public Int32 SeekableReadDirectory(
public virtual Int32 SeekableReadDirectory(
Object FileNode,
Object FileDesc,
String Pattern,

164
tst/memfs-dotnet/Program.cs
View File

@ -19,12 +19,17 @@
* associated repository.
*/
#define MEMFS_SLOWIO
using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Security.AccessControl;
using System.Threading;
#if MEMFS_SLOWIO
using System.Threading.Tasks;
#endif
using Fsp;
using VolumeInfo = Fsp.Interop.VolumeInfo;
@ -232,15 +237,20 @@ namespace memfs
class Memfs : FileSystemBase
{
private FileSystemHost Host;
public const UInt16 MEMFS_SECTOR_SIZE = 512;
public const UInt16 MEMFS_SECTORS_PER_ALLOCATION_UNIT = 1;
public Memfs(
Boolean CaseInsensitive, UInt32 MaxFileNodes, UInt32 MaxFileSize, String RootSddl)
Boolean CaseInsensitive, UInt32 MaxFileNodes, UInt32 MaxFileSize, String RootSddl,
UInt64 SlowioMaxDelay, UInt64 SlowioPercentDelay, UInt64 SlowioRarefyDelay)
{
this.FileNodeMap = new FileNodeMap(CaseInsensitive);
this.MaxFileNodes = MaxFileNodes;
this.MaxFileSize = MaxFileSize;
this.SlowioMaxDelay = SlowioMaxDelay;
this.SlowioPercentDelay = SlowioPercentDelay;
this.SlowioRarefyDelay = SlowioRarefyDelay;
/*
* Create root directory.
@ -259,7 +269,7 @@ namespace memfs
public override Int32 Init(Object Host0)
{
FileSystemHost Host = (FileSystemHost)Host0;
Host = (FileSystemHost)Host0;
Host.SectorSize = Memfs.MEMFS_SECTOR_SIZE;
Host.SectorsPerAllocationUnit = Memfs.MEMFS_SECTORS_PER_ALLOCATION_UNIT;
Host.VolumeCreationTime = (UInt64)DateTime.Now.ToFileTimeUtc();
@ -549,6 +559,89 @@ namespace memfs
Interlocked.Decrement(ref FileNode.OpenCount);
}
#if MEMFS_SLOWIO
private UInt64 Hash(UInt64 X)
{
X = (X ^ (X >> 30)) * 0xbf58476d1ce4e5b9ul;
X = (X ^ (X >> 27)) * 0x94d049bb133111ebul;
X = X ^ (X >> 31);
return X;
}
private static int Spin = 0;
private UInt64 PseudoRandom(UInt64 To)
{
/* John Oberschelp's PRNG */
Interlocked.Increment(ref Spin);
return Hash((UInt64)Spin) % To;
}
private bool SlowioReturnPending()
{
if (0 == SlowioMaxDelay)
{
return false;
}
return PseudoRandom(100) < SlowioPercentDelay;
}
private void SlowioSnooze()
{
double Millis = PseudoRandom(SlowioMaxDelay + 1) >> (int) PseudoRandom(SlowioRarefyDelay + 1);
Thread.Sleep(TimeSpan.FromMilliseconds(Millis));
}
void SlowioReadTask(
Object FileNode0,
IntPtr Buffer,
UInt64 Offset,
UInt64 EndOffset,
UInt64 RequestHint)
{
SlowioSnooze();
UInt32 BytesTransferred = (UInt32)(EndOffset - Offset);
FileNode FileNode = (FileNode)FileNode0;
Marshal.Copy(FileNode.FileData, (int)Offset, Buffer, (int)BytesTransferred);
Host.SendReadResponse(RequestHint, STATUS_SUCCESS, BytesTransferred);
}
void SlowioWriteTask(
Object FileNode0,
IntPtr Buffer,
UInt64 Offset,
UInt64 EndOffset,
UInt64 RequestHint)
{
SlowioSnooze();
UInt32 BytesTransferred = (UInt32)(EndOffset - Offset);
FileNode FileNode = (FileNode)FileNode0;
FileInfo FileInfo = FileNode.GetFileInfo();
Marshal.Copy(Buffer, FileNode.FileData, (int)Offset, (int)BytesTransferred);
Host.SendWriteResponse(RequestHint, STATUS_SUCCESS, BytesTransferred, ref FileInfo);
}
void SlowioReadDirectoryTask(
Object FileNode0,
Object FileDesc,
String Pattern,
String Marker,
IntPtr Buffer,
UInt32 Length,
UInt64 RequestHint)
{
SlowioSnooze();
UInt32 BytesTransferred;
var Status = base.SeekableReadDirectory(FileNode0, FileDesc, Pattern, Marker, Buffer, Length, out BytesTransferred);
Host.SendReadDirectoryResponse(RequestHint, Status, BytesTransferred);
}
#endif
public override Int32 Read(
Object FileNode0,
Object FileDesc,
@ -570,6 +663,17 @@ namespace memfs
if (EndOffset > FileNode.FileInfo.FileSize)
EndOffset = FileNode.FileInfo.FileSize;
#if MEMFS_SLOWIO
if (SlowioReturnPending())
{
var Hint = Host.GetOperationRequestHint();
Task.Run(() => SlowioReadTask(FileNode0, Buffer, Offset, EndOffset, Hint)).ConfigureAwait(false);
BytesTransferred = 0;
return STATUS_PENDING;
}
#endif
BytesTransferred = (UInt32)(EndOffset - Offset);
Marshal.Copy(FileNode.FileData, (int)Offset, Buffer, (int)BytesTransferred);
@ -619,6 +723,18 @@ namespace memfs
}
}
#if MEMFS_SLOWIO
if (SlowioReturnPending())
{
var hint = Host.GetOperationRequestHint();
Task.Run(() => SlowioWriteTask(FileNode0, Buffer, Offset, EndOffset, hint)).ConfigureAwait(false);
BytesTransferred = 0;
FileInfo = default(FileInfo);
return STATUS_PENDING;
}
#endif
BytesTransferred = (UInt32)(EndOffset - Offset);
Marshal.Copy(Buffer, FileNode.FileData, (int)Offset, (int)BytesTransferred);
@ -902,6 +1018,29 @@ namespace memfs
return false;
}
#if MEMFS_SLOWIO
public override int SeekableReadDirectory(
Object FileNode0,
Object FileDesc,
String Pattern,
String Marker,
IntPtr Buffer,
UInt32 Length,
out UInt32 BytesTransferred)
{
if (SlowioReturnPending())
{
var Hint = Host.GetOperationRequestHint();
Task.Run(() => SlowioReadDirectoryTask(FileNode0, FileDesc, Pattern, Marker, Buffer, Length, Hint));
BytesTransferred = 0;
return STATUS_PENDING;
}
return base.SeekableReadDirectory(FileNode0, FileDesc, Pattern, Marker, Buffer, Length, out BytesTransferred);
}
#endif
public override int GetDirInfoByName(
Object ParentNode0,
Object FileDesc,
@ -1140,6 +1279,9 @@ namespace memfs
private FileNodeMap FileNodeMap;
private UInt32 MaxFileNodes;
private UInt32 MaxFileSize;
private UInt64 SlowioMaxDelay;
private UInt64 SlowioPercentDelay;
private UInt64 SlowioRarefyDelay;
private String VolumeLabel;
}
@ -1170,6 +1312,9 @@ namespace memfs
UInt32 FileInfoTimeout = unchecked((UInt32)(-1));
UInt32 MaxFileNodes = 1024;
UInt32 MaxFileSize = 16 * 1024 * 1024;
UInt32 SlowioMaxDelay = 0;
UInt32 SlowioPercentDelay = 0;
UInt32 SlowioRarefyDelay = 0;
String FileSystemName = null;
String VolumePrefix = null;
String MountPoint = null;
@ -1202,9 +1347,18 @@ namespace memfs
case 'm':
argtos(Args, ref I, ref MountPoint);
break;
case 'M':
argtol(Args, ref I, ref SlowioMaxDelay);
break;
case 'n':
argtol(Args, ref I, ref MaxFileNodes);
break;
case 'P':
argtol(Args, ref I, ref SlowioPercentDelay);
break;
case 'R':
argtol(Args, ref I, ref SlowioRarefyDelay);
break;
case 'S':
argtos(Args, ref I, ref RootSddl);
break;
@ -1233,7 +1387,8 @@ namespace memfs
throw new CommandLineUsageException("cannot open debug log file");
Host = new FileSystemHost(Memfs = new Memfs(
CaseInsensitive, MaxFileNodes, MaxFileSize, RootSddl));
CaseInsensitive, MaxFileNodes, MaxFileSize, RootSddl,
SlowioMaxDelay, SlowioPercentDelay, SlowioRarefyDelay));
Host.FileInfoTimeout = FileInfoTimeout;
Host.Prefix = VolumePrefix;
Host.FileSystemName = null != FileSystemName ? FileSystemName : "-MEMFS";
@ -1262,6 +1417,9 @@ namespace memfs
" -t FileInfoTimeout [millis]\n" +
" -n MaxFileNodes\n" +
" -s MaxFileSize [bytes]\n" +
" -M MaxDelay [maximum slow IO delay in millis]\n" +
" -P PercentDelay [percent of slow IO to make pending]\n" +
" -R RarefyDelay [adjust the rarity of pending slow IO]\n" +
" -F FileSystemName\n" +
" -S RootSddl [file rights: FA, etc; NO generic rights: GA, etc.]\n" +
" -u \\Server\\Share [UNC prefix (single backslash)]\n" +