On Wed, Jan 15, 2014 at 08:24:18PM -0500, Matthew Wilcox wrote: > This series of patches add support for XIP to ext4. Unfortunately, > it turns out to be necessary to rewrite the existing XIP support code > first due to races that are unfixable in the current design. > > Since v4 of this patchset, I've improved the documentation, fixed a > couple of warnings that a newer version of gcc emitted, and fixed a > bug where we would read/write the wrong address for I/Os that were not > aligned to PAGE_SIZE. > > I've dropped the PMD fault patch from this set since there are some > places where we would need to split a PMD page and there's no way to do > that right now. In its place, I've added a patch which attempts to add > support for unwritten extents. I'm still in two minds about this; on the > one hand, it's clearly a win for reads and writes. On the other hand, > it adds a lot of complexity, and it probably isn't a win for pagefaults. I ran this through xfstests, but ext4 in default configuration fails too many of the tests with filesystem corruption and other cascading failures on the quick group tests (generic/013, generic/070, generic/075, generic/091, etc) for me to be able to tell if adding MOUNT_OPTIONS="-o xip" adds any problems or not.... XIP definitely caused generic/001 to fail, but other than that I can't really tell. Still, it looks like it functions enough to be able to add XFS support on top of. I'll get back to you with that ;) Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- 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
