Re: Incorrect disk space reporting

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2009/9/15 Michel Alexandre Salim <michael.silvanus@xxxxxxxxx>:
> I have btrfs /home partitions on two machines, a laptop with Fedora
> 11.91 (Rawhide) x86_64, and a netbook with the same OS, i686 (32-bit).
> Both with kernel 2.6.31-2.fc12 and btrfs-progs 0.19.
>
> /home directories are both converted from ext4.
>
> On the netbook, everything is fine; on the laptop, I thought
> everything was fine until I ran a program installer that checks the
> amount of disk space. To my surprise, I then noticed that it is as
> follows:
>
> $ df -h /home
> /dev/mapper/system-home 212G -64Z -99G 100% /home
>
> Doing btrfsck on the partition does not produce anything out of ordinary:
>
> # btrfsck /dev/mapper/system-home
> found 163919360000 bytes used err is 0
> total csum bytes: 158147320
> total tree bytes: 1976504320
> total fs tree bytes: 1623146496
> btree space waste bytes: 540904631
> file data blocks allocated: 215433904128
>  referenced 161871007744
> Btrfs Btrfs v0.19
>
> The same laptop has been used to format an external hard drive as
> Btrfs, and the reported disk space on that drive is fine as well.
> Deleting ext2_saved/image does not change the result reported by df.
>
> Any more data I could provide? I'd rather not image the drive as it is
> huge (and contains some personal data). I could, of course, backup,
> create a fresh filesystem, and restore, but would prefer to not do
> that if this problem needs troubleshooting.
>

This bug has already been fixed in btrfs-progs-unstable tree. The bug
only affects fstatfs(2)

Yan, Zheng
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