Btrfs devel - Feb 2011 - mkfs.btrfs doesn't work inside loopback mounted chroot jails: error checking /dev/sda3 mount status

Hi,
mkfs.btrfs aborts unconditionally with "error checking [whatever] mount
status" under some circumstances.

I''m running into it when using a live CD that boots from a minimal CD
image, then does

mount -o loop -t squashfs /squashfs.img /mnt/realsystem
chroot /mnt/realsystem
[stuff you actually want to do here]

strace shows mkfs.btrfs aborting after trying to

lstat("/squashfs.img", 0x7fff2c712c90) = -1 ENOENT (No such file or
directory)

[obviously, it can''t access /squashfs.img after chroot]


I''m attaching a "fix" that allows circumventing the problem
with a --force switch, patch is relative to "next" branch in git.
I''m also adding this patch to the Ark Linux package of btrfs-progs
unless someone screams very loudly. ;)

ttyl
bero

Hi,

you should search the mailinglist before you write patches :)

That problem is known and a patch is available:

https://patchwork.kernel.org/patch/449001/


But it isn''t in the btrfs-progs git yet.


Regards,
Felix

Am Fri, 04 Feb 2011 10:38:25 +0100
schrieb "Bernhard Rosenkraenzer" <bero@arklinux.ch>:
> Hi,
> mkfs.btrfs aborts unconditionally with "error checking [whatever]
> mount status" under some circumstances.
> 
> I''m running into it when using a live CD that boots from a minimal
CD
> image, then does
> 
> mount -o loop -t squashfs /squashfs.img /mnt/realsystem
> chroot /mnt/realsystem
> [stuff you actually want to do here]
> 
> strace shows mkfs.btrfs aborting after trying to
> 
> lstat("/squashfs.img", 0x7fff2c712c90) = -1 ENOENT (No such file
or
> directory)
> 
> [obviously, it can''t access /squashfs.img after chroot]
> 
> 
> I''m attaching a "fix" that allows circumventing the
problem with a
> --force switch, patch is relative to "next" branch in git.
I''m also
> adding this patch to the Ark Linux package of btrfs-progs unless
> someone screams very loudly. ;)
> 
> ttyl
> bero
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