On Tue, Mar 06, 2007 at 10:46:56AM -0600, Eric Sandeen wrote: > Ulrich Drepper wrote: > > Christoph Hellwig wrote: > >> fallocate with the whence argument and flags is already quite complicated, > >> I'd rather have another call for placement decisions, that would > >> be called on an fd to do placement decissions for any further allocations > >> (prealloc, write, etc) > > > > Yes, posix_fallocate shouldn't be made more complicated. But I don't > > understand why requesting linear layout of the blocks should be an > > option. It's always an advantage if the blocks requested this way are > > linear on disk. So, the kernel should always do its best to make this > > happen, without needing an additional option. > > > > Agreed on both points. The hints would be for things like start block, > or speculative EOF preallocation, not contiguity, which I think should > always be the goal. ISTR having had this discussion before ;) About guided preallocation for defrag: http://marc.info/?t=116247859500001&r=1&w=2 e.g.: The sorts of policies we need for effective use of preallocation: http://marc.info/?l=linux-fsdevel&m=116184475308164&w=2 http://marc.info/?l=linux-fsdevel&m=116278169519095&w=2 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
