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 NFS/CIFS/ocfs2/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. Since the last posting, each test tries to reflink (or dedupe) on the test or scratch FS to decide if they're going to run, instead of guessing based on FS type. Per Dave's suggestion, I also converted the basic functionality tests to use fixed sizes so that I can use md5sum in the golden output to check that the file contents match exactly. Issues: * I think the race checks for dedupe could be a little sharper at finding mistakes. * The realtime reflink test (xfs/804) crashes XFS before we even get to the reflink attempt. * 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. If you're going to start using this mess, you probably ought to just pull from my github trees for kernel[1], xfsprogs[2], xfstests[3], and xfs-docs[4]. They should just work with the btrfs that's in 4.3... and somewhat buggily with the 4.3 XFS patched with [1]. Comments and questions are, as always, welcome. --D [1] https://github.com/djwong/linux/tree/for-dave [2] https://github.com/djwong/xfsprogs/tree/for-dave [3] https://github.com/djwong/xfstests/tree/for-dave [4] https://github.com/djwong/xfs-documentation/tree/for-dave -- 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
