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Re: [ntfsd] File size doesn't change in explore.

rod_widdowsonrod_widdowson Member - All Emails Posts: 1,024
> 1) When the file size is changed(request such as
> I call FsRtlNotifyFullReportChange with Filter:FILE_NOTIFY_CHANGE_SIZE.

That sounds reasonable.

> 2) I didn't find the IRP_MJ_NETWORK_QUERY_OPEN major function
> code in my driver. Is it essential?

Ah sorry, you are an FSD aren't you. In this case it is the
FastIoQueryOpen path.


发件人: Rod Widdowson <>
收件人: Windows File Systems Devs Interest List <>
发送日期: 2009/11/14 (周六) 5:28:20 下午
主 题: Re:[ntfsd] File size doesn't change in explore.

These things are often due to either

1) Not changing the size in IRP_MJ_DIRECTORY_CONTROL
2) Not changing the size in IRP_MJ_NETWORK_QUERY_OPEN

If I might also be so bold: try starting with a test application which is
less "challenging" than explorer. Ladislav's (free) Filetest
( is awesome for discovering what is happening and
you only ever see one IRP at a time.

Good luck


"光凯 张" <> wrote in message news:xxxxx@ntfsd...
Hi, guys

First of all, sorry for my poor english.

I got a problem about the file size.
In my file system driver, I handle the IRP_MJ_FILE_INFORMATION request.
And it passes the right value to me(I use filetest to do
But the explorer shows that the file size is 0 bytes. I just don't know why?
When the file size need to be changed, I set the FO_FILE_MODIFIED flag on
the FileObject, and report the change to the directory. Just hope someone
give me a hint. Thanks.

Here is my dispatch route to handle IRP_MJ_FILE_INFORMATION:

//do some check...
switch (FileInformationClass) {
case FileBasicInformation:
{ // Process it and break...
case FileStandardInformation:
{ // Process it and break...
case FileInternalInformation:
{ // Process it and break...
case FileEaInformation:
{ // Process it and break...
case FileNameInformation:
{ // Process it and break...
case FilePostionInformation:
{ // Process it and break...
case FileAllInformation:
{ // Process it and break...
case FileNetworkOpenInformation:
{ // Process it and break...
case FileAttributeTagInformation:
{ // Process it and break...

// According to the status code, requeue it requst or complete the request


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