IRP_MJ_SET_INFORMATION get FILE_VALID_DATA_LENGTH_INFORMATION

NTFSD
1

Hello All,

i would like to know if anybody knows how can i get FILE_VALID_DATA_LENGTH_INFORMATION in IRP_MJ_SET_INFORMATION irp.

In post operation i can get the new file valid data length but i would like to also get old file valid data length. FltQueryInformationFile seems that does not work with FILE_VALID_DATA_LENGTH_INFORMATION structure. Any suggestion?

Best Regards, Mitja

2

If you are working in a filter environment, try
_FSRTL_COMMON_FCB_HEADER.ValidDataLength of the FILE_OBJECT.FsContext.

Lijun

xxxxx@hermes-softlab.com wrote:
Hello All,

i would like to know if anybody knows how can i get FILE_VALID_DATA_LENGTH_INFORMATION in IRP_MJ_SET_INFORMATION irp.

In post operation i can get the new file valid data length but i would like to also get old file valid data length. FltQueryInformationFile seems that does not work with FILE_VALID_DATA_LENGTH_INFORMATION structure. Any suggestion?

Best Regards, Mitja

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