linux-ext4 - Re: Question on fallocate/ftruncate sequence

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Message-Id: <1248372301.31323.2.camel@bobble.smo.corp.google.com>
Date:	Thu, 23 Jul 2009 11:05:01 -0700
From:	Frank Mayhar <fmayhar@...gle.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Andreas Dilger <adilger@....com>,
	Curt Wohlgemuth <curtw@...gle.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: Question on fallocate/ftruncate sequence

On Thu, 2009-07-23 at 12:00 -0500, Eric Sandeen wrote:
> Sorry I skimmed to fast, skipped over the fsck part.  But:
> 
> # mkfs.ext4 /dev/sdb3
> mke2fs 1.41.5 (23-Apr-2009)
> ...
> # mount /dev/sdb3 /mnt/test
> # touch /mnt/test/testfile
> # /root/fallocate -n -l 16m /mnt/test/testfile
> # ls -l /mnt/test/testfile
> -rw-r--r-- 1 root root 0 Jul 23 12:13 /mnt/test/testfile
> # du -h /mnt/test/testfile
> 16M	/mnt/test/testfile
> # umount /mnt/test
> # e2fsck -f /dev/sdb3
> e2fsck 1.41.5 (23-Apr-2009)
> Pass 1: Checking inodes, blocks, and sizes
> Pass 2: Checking directory structure
> Pass 3: Checking directory connectivity
> Pass 4: Checking reference counts
> Pass 5: Checking group summary information
> /dev/sdb3: 12/244800 files (0.0% non-contiguous), 37766/977956 blocks
> 
> there doesn't seem to be a problem in fsck w/ block past EOF, or am I
> missing something else?

I was taking Andreas' word for it but now that you mention it, I see the
same thing.  Andreas, did you have a specific case in mind?
-- 
Frank Mayhar <fmayhar@...gle.com>
Google, Inc.

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