On 4/14/11 10:52 AM, Pádraig Brady wrote: > On 14/04/11 16:50, Eric Sandeen wrote: >> On 4/14/11 9:59 AM, Pádraig Brady wrote: >>> On 14/04/11 15:02, Markus Trippelsdorf wrote: >>>>>> Hi Pádraig, >>>>>> >>>>>> here you go: >>>>>> + filefrag -v unwritten.withdata >>>>>> Filesystem type is: ef53 >>>>>> File size of unwritten.withdata is 5120 (2 blocks, blocksize 4096) >>>>>> ext logical physical expected length flags >>>>>> 0 0 274432 2560 unwritten,eof >>>>>> unwritten.withdata: 1 extent found >>>>>> >>>>>> Please notice that this also happens with ext4 on the same kernel. >>>>>> Btrfs is fine. >>>>> >>>> `filefrag -vs` fixes the issue on both xfs and ext4. >>> >>> So in summary, currently on (2.6.39-rc3), the following >>> will (usually?) report a single unwritten extent, >>> on both ext4 and xfs >>> >>> fallocate -l 10MiB -n k >>> dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=k >>> filefrag -v k # grep for an extent without unwritten || fail >> >> right, that's what I see too in testing. >> >> But would the coreutils install have done a preallocation of the destination file? >> >> Otherwise this looks like a different bug... >> >>> This particular issue has been discussed so far at: >>> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8411 >>> Note there it was stated there that ext4 had this >>> fixed as of 2.6.39-rc1, so maybe there is something lurking? >> >> ext4 got a fix, but not xfs, I guess. My poor brain can't remember, I think I started looking into it, but it's clearly still broken. >> >> Still, I don't know for sure what happened to Markus - did something preallocate, in his case? > > Well that preallocate test is failing for him > when the source file is either on ext4 or xfs. > He noticed the issue initially on XFS when copying > none preallocated files, so XFS probably just has > the general issue of needing a sync before fiemap, > where as EXT4 just has this preallocate one > (though I've not seen it myself). > > cheers, > Pádraig. > well, if I simply take the preallocation step out of the testcase, it works fine on xfs without a sync. So I still don't know what Markus hit... -Eric _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
