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

To: Pádraig Brady <P@xxxxxxxxxxxxxx>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
From: Jim Meyering <jim@xxxxxxxxxxxx>
Date: Thu, 14 Apr 2011 21:39:39 +0200
Cc: linux-ext4@xxxxxxxxxxxxxxx, Eric Sandeen <sandeen@xxxxxxxxxxx>, coreutils@xxxxxxx, Markus Trippelsdorf <markus@xxxxxxxxxxxxxxx>, xfs-oss <xfs@xxxxxxxxxxx>
In-reply-to: <878vvcspz0.fsf@xxxxxxxxxxxxxxxx> (Jim Meyering's message of "Thu, 14 Apr 2011 19:27:31 +0200")
References: <20110414102608.GA1678@xxxxxxxxxxxxxx> <20110414120635.GB1678@xxxxxxxxxxxxxx> <20110414140222.GB1679@xxxxxxxxxxxxxx> <4DA70BD3.1070409@xxxxxxxxxxxxxx> <4DA717B2.3020305@xxxxxxxxxxx> <4DA7182B.8050409@xxxxxxxxxxxxxx> <878vvcspz0.fsf@xxxxxxxxxxxxxxxx>
Jim Meyering wrote:
...
> FYI, I see the same failure now using ext3 (and but not w/ext4)
> with rawhide's 2.6.39-0.rc2.git0.0.fc16.x86_64:

Correction.
The failure below is not on ext3, but on a loopback-mounted
ext4 file system.

The test detected that the current FS was ext3 -- and it's known
that this test is not useful on ext3 -- and since I was running it
as root, it creates a loopback ext4 file system on which to run the test.

>   + df -t ext3 .
>   + require_root_
>   + uid_is_privileged_
>   ++ id -u
>   + my_uid=0

However, other strange things are happening here.
I'm investigating.

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