Hi, I'm working on network filesystem write helpers to go with the read helpers, and I see situations where I want to write a few bytes to the cache, but have more available that could be written also if it would allow the filesystem/blockdev to optimise its layout. Say, for example, I need to write a 3-byte change from a page, where that page is part of a 256K sequence in the pagecache. Currently, I have to round the 3-bytes out to DIO size/alignment, but I could say to the API, for example, "here's a 256K iterator - I need bytes 225-227 written, but you can write more if you want to"? Would it be useful/feasible to have some sort of interface that allows the offer to be made? David
