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Subject:	Re: Size limitation for NcFsd drive?
To:	cygwin AT cygwin DOT com
References:	<2483665a-eae1-737d-59f2-ca6af9428aca AT lauterbach DOT com> <2b6c3324-0a18-7437-c85b-bb30d3cbdbae AT lauterbach DOT com> <20160728195859 DOT GE26311 AT calimero DOT vinschen DOT de> <8ffdb11a-a2a6-109b-988d-2d5f38c98731 AT lauterbach DOT com> <20160729141831 DOT GA9364 AT calimero DOT vinschen DOT de> <20160729143815 DOT GE5963 AT calimero DOT vinschen DOT de>
From:	Franz Sirl <Franz DOT Sirl-kernel AT lauterbach DOT com>
Message-ID:	<dc4405e7-94c8-b24d-71ea-2359578fc30b@lauterbach.com>
Date:	Tue, 2 Aug 2016 16:26:42 +0200
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Am 2016-07-29 um 16:38 schrieb Corinna Vinschen:
> On Jul 29 16:18, Corinna Vinschen wrote:
>> In the first place it would be prudent to find out why the
>> FileAllInformation info class fails on this drive.  And in the second
>> place it would be important to find out how to fix this.  Potential
>> checks:
>>
>> - Buffer alignment of the FILE_ALL_INFORMATION member in class
>>   path_conv_handle.
>>
>> - Buffer size of the FILE_ALL_INFORMATION member.  For instance,
>>   does it work if the buffer is 1 byte bigger?  Or perhaps if
>>   the buffer is NAME_MAX bigger?
>
> - There's also a chance (albeit minor) that the FileAllInformation call
>   actually worked and the weird status code is just wrong.  After all,
>   returning from this call with STATUS_BUFFER_OVERFLOW is valid, too,
>   so I'd check for this as well here.

Hi Corinna,

no, the error code isn't influenced by alignment or size. For local 
drives and SMB shares the STATUS_BUFFER_OVERFLOW turns into 
STATUS_SUCCESS as soon as there is enough room for the share path in the 
FILE_NAME_INFORMATION.FileName flexible array member (actually, why 
isn't path_conv_handle.attribs._fai larger? performance? 
FileNameInformation usually not needed?). But for the NCP share the 
strange error code for FileAllInformation remains. Checking all the 
members of FileAllInformation one by one, it turned out that it's the 
FileInternalIformation member that fails. I've reported it as a bug to 
Novell.

Nevertheless I believe the fallback to 
NtQueryDirectoryFile(FileIdBothDirectoryInformation) does not do what 
you want if the path is the root directory of a share. But that's not 
the cause of this problem.

Franz.



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