Because I've seen some issues with the amount of overhead we spend in the bmap btree when using reflinks I though I'd dust up the multipage write code again. This was first started by Dave Chinner a long time ago, then I did beat it into shape for production runs in a very constrained ARM NAS enviroment for Tuxera almost as long ago, and now half a dozen rewrites later it's back. The basic idea is to avoid the crazy per-block get_blocks overhead and make use of extents in the buffered write path by iterating over them instead. I could probably write a lot more here, but for now I'd like people to take a look at this version. It passes xfstests fine on blocksize == PAGE_SIZE setups, but I haven't done much testing with small block sizes yet. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
