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Message-ID: <4FBD3102.6050001@redhat.com>
Date:	Wed, 23 May 2012 13:48:34 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: ext4 > 16T woes

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 :(

# 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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