Hi all, This is part of the third revision of an RFC for adding to XFS support for tracking reverse-mappings of physical blocks to file and metadata; and support for mapping multiple file logical blocks to the same physical block, more commonly known as reflinking. This patchset aims to make xfstests perform more rigorous testing of the btrfs/XFS file clone, reflink, and dedupe ioctls. There are now tests of the basic functionality of the three ioctls; tests to ensure that the filesystem exhibits the expected copy on write semantics; tests to try to suss out race conditions in the new write paths; tests to ensure that the ioctls peform basic disk accounting correctly; tests of the interaction between reflink and the various fallocate verbs (allocate, punch, collapse, insert zeroes); and some attempts to test the upper limits of reflinking and ENOSPC behavior. The tests have been totally rewritten since the last posting to drop FIEMAP usage; this should enable the tests to cover NFS and CIFS. Issues: * I think the race checks for dedupe could be a little sharper at finding mistakes. * I started the numbering really high to prevent the tests from colliding with whatever new tests might arrive; this will require some intervention to fix. * I don't have any interesting NFS/CIFS setups for test. :( If you're going to start using this mess, you probably ought to just pull from my github trees for kernel[1], xfsprogs[2], and xfstests[3]. They should just work with the btrfs that's in 4.3. Comments and questions are, as always, welcome. --D [1] https://github.com/djwong/linux-xfs-dev/commits/master [2] https://github.com/djwong/xfsprogs/commits/for-next [3] https://github.com/djwong/xfstests/commits/master -- 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
