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Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)

To: coreutils@xxxxxxx
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
From: Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>
Date: Thu, 14 Apr 2011 14:06:35 +0200
Cc: xfs@xxxxxxxxxxx
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On 2011.04.14 at 12:26 +0200, Markus Trippelsdorf wrote:
> I trashed my system this morning when I installed coreutils-8.11.
> What happened is that coreutils compiles and links correctly, but then
> the following command (during the installation phase):
> ./ginstall chroot hostid nice who users pinky stty df stdbuf [ base64 
> basename cat chcon chgrp chmod chown cksum comm cp csplit cut date dd dir 
> dircolors dirname du echo env expand expr factor false fmt fold head id join 
> link ln logname ls md5sum mkdir mkfifo mknod mktemp mv nl nproc nohup od 
> paste pathchk pr printenv printf ptx pwd readlink rm rmdir runcon seq sha1sum 
> sha224sum sha256sum sha384sum sha512sum shred shuf sleep sort split stat sum 
> sync tac tail tee test timeout touch tr true truncate tsort tty uname 
> unexpand uniq unlink vdir wc whoami yes arch 
> '/var/tmp/portage/sys-apps/coreutils-8.11/image//usr/bin'
> apparently produces files which have the length of the originals but are
> full of zeros. (and these were then installed to my live system, thereby
> trashing it).
> Now all the above is automated, because I use gentoo.
> But when I run the command above (ginstall) later again by hand,
> everything is copied just fine and the resulting binaries are all
> usable.
> The partition in question uses xfs.
> # xfs_info /var
> meta-data=/dev/sda1              isize=256    agcount=4, agsize=12800000 blks
>          =                       sectsz=4096  attr=2
> data     =                       bsize=4096   blocks=51200000, imaxpct=25
>          =                       sunit=0      swidth=0 blks
> naming   =version 2              bsize=4096   ascii-ci=0
> log      =internal               bsize=4096   blocks=25000, version=2
>          =                       sectsz=4096  sunit=1 blks, lazy-count=1
> realtime =none                   extsz=4096   blocks=0, rtextents=0
> This is a 4kb hard drive (sectsz=4096).
> I'm running the lastest vanilla git kernel (2.6.39-rc3-00087-gda768a4).
> Now my question is, could this be caused by the recent FIEMAP changes in
> coreutils?

Apparently yes:

Here is a "make check" failure example:

FAIL: cp/fiemap-empty (exit: 1)
+ fallocate -l 10MiB -n unwritten.withdata
+ dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock
10+0 records in
10+0 records out
5120 bytes (5.1 kB) copied, 0.00219578 s, 2.3 MB/s
+ cp unwritten.withdata cp.test
++ stat -c %s unwritten.withdata
++ stat -c %s cp.test
+ test 5120 = 5120
+ cmp unwritten.withdata cp.test
unwritten.withdata cp.test differ: char 1, line 1
+ fail=1


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