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I tried to run HLK "File IO 2 Tests" on my minifilter but it failed on Fat FS because the attribute FILE_ATTRIBUTE_TEMPORARY was cleared on the file when the last handle was closed (UDF, REFS and NTFS pass the test).
In my Cleanup Pre/Post operation callback, the FileObject has the flag FO_TEMPORARY_FILE but when I reopen it, the attribute was cleared.
I tried to debug fastfat.sys, from the open to the close, the FCB->FcbState has FCB_STATE_TEMPORARY and the FileObject->Flags has FO_TEMPORARY_FILE.
I don't understand how/when/why the flag is cleared after the last handle is closed.
It's possible that the CacheManager clear this bit in specific case ?
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