linux-ext4 - Re: ext4

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Date:	Fri, 25 May 2012 16:01:55 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: ext4 > 16T woes

On 5/23/12 1:48 PM, Eric Sandeen wrote:
> I'll try to look into this but just wanted to put it out there.
> 
> After creating a 32T fs and filling it with 1T preallocated files,
> I get quite a lot of corruption; this wasn't really the test
> I wanted to do, I wanted to then remove a file with mostly
> high blocks, run fsstress, and test recovery :(

FWIW I tracked this down to the rbtree bitmap backend and sent
a patch,

[PATCH] libext2fs: Fix rbtree backend for extent lengths greater than 2^32

-Eric

> # uname -r
> 3.4.0-rc4+
> # truncate --size 32t imagefile2
> # mkfs.ext4 -F imagefile2
> mke2fs 1.42.3 (14-May-2012)
> ...
> # mount -o loop imagefile2 /mnt/scratch
> # for I in `seq 1 32`; do fallocate -l 1t /mnt/scratch/1tfile$I; done
> # umount /mnt/scratch
> # time e2fsck -fn imagefile2
> e2fsck 1.42.3 (14-May-2012)
> <many many many lines snipped>
> Free blocks count wrong for group #131072 (0, counted=32768).
> Fix? no
> 
> Free blocks count wrong for group #131073 (0, counted=32768).
> Fix? no
> 
> Free blocks count wrong for group #131074 (0, counted=4164).
> Fix? no
> 
> Free blocks count wrong (3, counted=4294967299).
> Fix? no
> 
> 
> imagefile2: ********** WARNING: Filesystem still has errors **********
> 
> imagefile2: 43/536870912 files (0.0% non-contiguous), 8589934589/8589934592 blocks
> 
> real	27m40.133s
> user	27m12.886s
> sys	0m6.238s
> 
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