[cifs-protocol] [REG:112120410054506] FSCTL_SRV_COPYCHUNK locking discrepancies between Windows versions

[Obaid Farooqi]

Hi David:
Thanks for contacting Microsoft. A member of open specifications team will be in touch soon.

Regards,
Obaid Farooqi
Escalation Engineer | Microsoft

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-----Original Message-----
From: David Disseldorp [mailto:ddiss at suse.de]
Sent: Tuesday, December 04, 2012 4:42 AM
To: Interoperability Documentation Help; cifs-protocol at cifs.org; pfif at tridgell.net
Subject: FSCTL_SRV_COPYCHUNK locking discrepancies between Windows versions

Hi DocHelp,

Windows server behaviour when processing SMB2 FSCTL_SRV_COPYCHUNK requests under byte-range lock conditions varies between versions.
These discrepancies do not appear to be documented.

Under Windows Server 2012, an SMB2 FSCTL_SRV_COPYCHUNK request with a SourceKey, SourceOffset and Length referring to a locked file range (SMB2_LOCKFLAG_EXCLUSIVE), fails with STATUS_FILE_LOCK_CONFLICT.

Under Windows 7 and Windows Server 2008r2, this is not the case. An FSCTL_SRV_COPYCHUNK request with a SourceKey, SourceOffset and Length referring to a locked file range succeeds.

An FSCTL_SRV_COPYCHUNK request with a _target_ FileID, TargetOffset and Length referring to a locked file range fails on all tested platforms (Windows Server 2012, Windows Server 2008r2 and Windows 7) with STATUS_FILE_LOCK_CONFLICT.

Network traces available.

Regards, David
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