From: Ragnar Hojland Espinosa on
Moving about 200 GB through the network out of the computer (vanilla
2.6.34, sata_via sata device), after it finished I noticed:

EXT4-fs error (device sda1): ext4_mb_free_metadata: Double free of
blocks 20764 (20764 395)
JBD: Spotted dirty metadata buffer (dev = sda1, blocknr = 0). There's
a risk of filesystem corruption in case of system crash..

So I proceeded to umount and fsck.

# umount /vol3/
# fsck -f /vol3/
fsck from util-linux-ng 2.17.2
e2fsck 1.41.11 (14-Mar-2010)
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
Free blocks count wrong for group #6764 (17193, counted=16798).
Fix<y>? yes

Free blocks count wrong (44974340, counted=44973945).
Fix<y>? yes

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