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[Emacs-bug-tracker] bug#8001: closed (cp (8.10) sparse handling fails on


From: GNU bug Tracking System
Subject: [Emacs-bug-tracker] bug#8001: closed (cp (8.10) sparse handling fails on compressed btrfs (cp/fiemap-2))
Date: Wed, 23 Feb 2011 09:54:02 +0000

Your message dated Wed, 23 Feb 2011 09:49:55 +0000
with message-id <address@hidden>
and subject line Re: bug#8001: cp (8.10) sparse handling fails on compressed 
btrfs (cp/fiemap-2)
has caused the GNU bug report #8001,
regarding cp (8.10) sparse handling fails on compressed btrfs (cp/fiemap-2)
to be marked as done.

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address@hidden)


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8001: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8001
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--- Begin Message --- Subject: cp (8.10) sparse handling fails on compressed btrfs (cp/fiemap-2) Date: Mon, 7 Feb 2011 22:53:26 -0500 User-agent: KMail/1.13.5 (Linux/2.6.37; KDE/4.5.5; x86_64; ; )
after upgrading from coreutils 8.9 to 8.10, the sparse handling in cp is 
silently breaking on btrfs filesystems with the compressed option enabled.  
using --sparse=never works fine, but "auto" or "always" tend to fail.  the 
cp/fiemap-2 test catches the issue nicely.

to reproduce (i'm using linux-2.6.37):
file=btrfs.img
mntp=/mnt/tmp/
dd if=/dev/zero of=$file bs=1M count=0 seek=1024
mkfs.btrfs $file 
mount -t btrfs -o compress $file $mntp
cd $mntp
tar xf ~/coreutils-8.10.tar.xz
cd coreutils-8.10/tests
./cp/fiemap-2

and this last test shows:
Filesystem    Type   1K-blocks      Used Available Use% Mounted on
/dev/loop0   btrfs     1048576     20420    377028   6% /mnt/tmp
0+0 records in
0+0 records out
0 bytes (0 B) copied, 2.7598e-05 s, 0.0 kB/s
k k2 differ: byte 1, line 1
255+0 records in
255+0 records out
261120 bytes (261 kB) copied, 0.00310926 s, 84.0 MB/s
-mike

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--- End Message ---
--- Begin Message --- Subject: Re: bug#8001: cp (8.10) sparse handling fails on compressed btrfs (cp/fiemap-2) Date: Wed, 23 Feb 2011 09:49:55 +0000 User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
On 23/02/11 03:31, Chris Mason wrote:
> I've got a fix for this on the btrfs side in testing.  It is definitely
> a btrfs bug.

[resend]

Cool.
I'm closing this ticket, so.

Interesting I didn't notice this with kernel-2.6.38-0.rc4.git0.2.fc15.i686
(with a 1G loop back BTRFS on ext4)

I'd appreciate a link to the fix at some stage.
If we know what's going on exactly we might be
able to know how widespread the issue is and
whether we could work around it in `cp`.

cheers,
Pádraig.


--- End Message ---

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