Minifilter file size query

NTFSD
1

Hi, thanks for checking out my post. I have two questions related to minifilter driver behavior during write operations:

  1. In a NonCached I/O operation where the PagingIo flag is false, will the value of Data->Iopb->Parameters.Write.Length in the PreWrite callback be sector-aligned?

  2. If I'm performing a NonCached I/O write with PagingIo set to false, what will be the value of the file size in the PreWrite stage? Specifically, will ((PFSRTL_ADVANCED_FCB_HEADER)FltObjects->FileObject->FsContext)->FileSize.QuadPart reflect the original file size before the write, or the updated size after the write?

Would appreciate any insights or clarifications. Thanks!