>>>>> Andrew Morton (AM) writes: -> get_block(with BH_Delay) can be used to signal >> filesystem that no actual allocation is required. >> so, aware filesystem can just reserve space. then -> writepages() should walk through the pages like >> it does currently, collect contiugous sequences >> and again call ->get_block(w/o BH_Delay) with b_size >> covering all contiguous pages ... >> AM> That sounds like it'd work, yes. AM> Except for an address_space which is using delayed allocation, its -> prepare_write wouldn't call get_block at all, so perhaps that isn't AM> needed. hmm. I thought it has to call get_block() at least to know whether the block is already allocated. and I was going to reserve space in prepare_write for which some fs-specific method is needed becase only fs knows how much metadata it'd need. thanks, Alex - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
