FO_SEQUENTIAL_ONLY flag

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Hi, guys!

I have small FS filter which compress files on IRP_MJ_WRITE and decompress on IRP_MG_READ. If file operation goes to FS cache (FO_CACHE_SUPPORTED) I pass through this IRP, because it's no reason to compress/decompress files in cache. But in some situations I see file operations with FO_SEQUENTIAL_ONLY. What is that? Do I need to process these requests? :confused:

Posted 15-Nov-10 2:06am

Dr. Kelwin

Updated 15-Nov-10 6:55am

Sauro Viti

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Sauro Viti · Accepted Answer · 2010-11-15T03:31:00

Solution 1

Look at FILE_OBJECT Structure (Windows Driver Kit)[^]. About FO_SEQUENTIAL_ONLY they say: The file associated with the file object was opened for sequential I/O operations only. This means that the file has been open for reading or writing sequentially (i.e. without seeking).

Posted 15-Nov-10 3:31am

Sauro Viti

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Dr. Kelwin 15-Nov-10 9:44am

thanks for answer:)

so, FO_SEQUENTIAL_IO flag could appears in cached and non-cached I/O?

Sauro Viti 15-Nov-10 11:34am

Yes, it could

Dr. Kelwin 15-Nov-10 12:41pm

thanks, all works :)