On Wed, Jun 27, 2007 at 07:32:45AM +0200, Nick Piggin wrote: > I think using fsblock to drive the IO and keep the pagecache flags > uptodate and using a btree in the filesystem to manage extents of block > allocations wouldn't be a bad idea though. Do any filesystems actually > do this? Yes. XFS. But we still need to hold state in buffer heads (BH_delay, BH_unwritten) that is needed to determine what type of allocation/extent conversion is necessary during writeback. i.e. what we originally mapped the page as during the ->prepare_write call. Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
