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3.2.4.10 Application Requests Querying File System Attributes

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The application provides:

  • A handle to the Open identifying a file that resides in the file system whose attributes are being queried.

  • The maximum output buffer it will accept.

  • The InformationClass of the file system attributes being queried, as specified in [MS-FSCC] section 2.5.

If the handle is invalid, or if no Open referenced by the handle is found, the client MUST return an implementation-specific error code. If the handle is valid and Open is found, the client MUST proceed as follows.

For the specified Open, the client MUST select a connection as specified in section 3.2.4.1.7. If no connection is available, the client MUST fail the query operation.

Otherwise, the client initializes an SMB2 QUERY_INFO Request following the syntax specified in section 2.2.37. The SMB2 header MUST be initialized as follows:

  • The Command field is set to SMB2 QUERY_INFO.

  • The MessageId field is set as specified in section 3.2.4.1.3.

  • The SessionId field is set to Open.TreeConnect.Session.SessionId.

  • The TreeId field is set to Open.TreeConnect.TreeConnectId.

The SMB2 QUERY_INFO Request MUST be initialized as follows:

  • The InfoType field is set to SMB2_0_INFO_FILESYSTEM.

  • The FileInfoClass field is set to the InformationClass that is received from the application.

  • The OutputBufferLength field is set to the maximum output buffer that the calling application will accept.

  • The InputBufferOffset field SHOULD<162> be set to 0.

  • The InputBufferLength field is set to 0.

  • The AdditionalInformation is set to 0.

  • The FileId field is set to Open.FileId.

The request MUST be sent to the server.