On Mon, Feb 08, 2016 at 05:11:45PM -0800, Darrick J. Wong wrote: > Happy New Year! > > Dave Chinner: I've renumbered the new tests and pushed to github[3] if > you'd like to pull. Can you include the commit ID I should see at the head of the tree so I can confirm I'm pulling the right branch? BTW, git doesn't like this: https://github.com/djwong/xfstests/tree/for-dave What git really wants is the tree url with a separate branch name like so: https://github.com/djwong/xfstests.git for-dave (i.e. the typical output from a git request-pull command) > This is a (no longer) small patch set against the reflink/dedupe test > cases in xfstests. The first four patches fix errors in the existing > reflink tests, some of which are from Christoph Hellwig. > > Patches 5-6 refactor the dmerror code so that we can use it to > simulate transient IO errors, then use this code to test that > unwritten extent conversion does NOT happen after a directio write to > an unwritten extent hits a disk error. Due to a bug in the VFS > directio code, ext4 can disclose stale disk contents if an aio dio > write fails; XFS suffers this problem for any failing dio write to an > unwritten extent. Christoph's kernel patchset titled "vfs/xfs: > directio updates to ease COW handling V2" (and a separate ext4 warning > cleanup) is needed to fix this. > > Patches 7-9, 13, 15, 17, 18, 20, 21, and 23 exercise various parts > of the copy on write behavior that are necessary to support shared > blocks. The earlier patches focus on correct CoW behavior in the > presence of IO errors during the copy-write, and the later patches > focus on XFS' new cow-extent-size hint that greatly reduces > fragmentation due to copy on write behavior by encouraging the > allocator to allocate larger extents of replacement blocks. > > Patches 10-12 and 14 perform stress testing on reflink and CoW to > check the behaviors when we get close to maximum refcount, when we > specify obnxiously large offsets and lengths, and when we try to > reflink millions of extents at a time. > > Patch 16 tests quota accounting behavior when reflink is enabled. > > Patch 19 adds a few tests for the XFS reverse mapping btree to ensure > that things like metadump and growfs work correctly. > > Patch 22 checks that get_bmapx and fiemap (on XFS) correctly flag > extents as having shared blocks. XFS now follows btrfs and ocfs2 > FIEMAP behavior such that if any blocks of a file's extent are shared, > the whole extent is marked shared. This is in contrast to earlier > XFS-only behavior that reported shared and non-shared regions as > separate extents. This may change - xfs_bmap doesn't combine extents in it's output even if they are adjacent. For debugging purposes (which is what xfs_bmap/fiemap is for), it's much better to be able to see the exact extent layout and block sharing. I suspect the solution of least surprise is to make fiemap behave like the other filesystems, and make xfs_bmap behave in a manner that is useful to us.... :P > 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], > xfs-docs[4], and man-pages[5]. All tests should pass on XFS. I > tried btrfs this weekend and it failed 166, 175, 182, 266, 271, 272, > 278, 281, 297, 298, 304, 333, and 334. ocfs2 (when I jury-rigged it > to run the cp_reflink tests) seemed to have a quota bug and crashes > hard in 284 (but was otherwise fine). Fun fun fun. I'll look through the patchs, and if there's nothing major I'll pull it in once I get a commit ID from you. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe fstests" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
