disk corruption issues #6
Description
Hello,
A couple of problems I encountered while using ExFat.DiscUtils with a vmdk virtual disk formatted ExFat:
-
The below code was used to copy files placed in a host directory to an empty directory in a VM.
Then, we power on the VM ,delete the files from the VM manually via file explorer, then power off the VM.
Doing this a couple of times (copying files to VM then deleting them and re-copying) with lots of files or directories causes disk corruption.
Specifically, fill the host directory with 300-400 files, execute the given code, then delete the files copied into the VM (manually).
After repeating this a couple of times the file system becomes corrupted.
This has been reproduced a couple of times but seems a bit random. -
Copying an empty file (can be done with the below code) causes disk corruption.
It seems this happens every time we copy empty files.
Code used:
private static void Test(string vmdkPath, int partitionNumber, string pathInHost, string pathInVm)
{
using (VirtualDisk disk = new DiscUtils.Vmdk.Disk(vmdkPath,FileAccess.ReadWrite))
using (ExFatFileSystem fs = new ExFatFileSystem(disk.partitions[partitionNumber].Open()))
{
string[] hostDirFilePaths= Directory.GetFiles(pathInHost, "*.*", SearchOption.TopDirectoryOnly);
foreach (string hostFilePath in hostDirFilePaths)
{
string vmFilePath = Path.Combine(pathInVm, Path.GetFileName(hostFilePath));
string dst = Path.Combine(fs.Root.FullName, vmFilePath);
using (Stream dstStream = fs.OpenFile(dst, FileMode.Create, FileAccess.ReadWrite))
using (Stream sourceStream = File.Open(hostFilePath, FileMode.Open, FileAccess.Read))
{
CoptStream(sourceStream, dstStream);
}
}
}
}
private static void CopyStream(Stream srcStream, Stream dstStream)
{
int bufferLength = (int)Math.Min(srcStream.Length, 4*1024*1024);
byte[] buffer = new byte[bufferLength];
int bytesRead= 0;
while((bytesRead = srcStream.Read(buffer,0,bufferLength))>0)
{
dstStream.Write(buffer,0,bytesRead);
if(bytesRead < bufferLength)
{
break;
}
}
}
Thanks,
Chris