On 5/3/13 3:11 PM, Josef Bacik wrote:
> So if you have a mount command that doesn't use /etc/mtab then it will spit out
> a different device for the mounted device. So say we have
>
> SCRATCH_DEV_POOL="/dev/sda /dev/sdb /dev/sdc"
>
> we will turn this into
>
> SCRATCH_DEV="/dev/sda"
> SCRATCH_DEV_POOL="/dev/sdb /dev/sdc"
>
> and then when you mkfs this you do _scratch_mkfs $SCRATCH_DEV_POOL which turns
> into this
>
> mkfs.btrfs /dev/sdb /dev/sdc /dev/sda
>
> becuase we do
>
> mkfs $* $SCRATCH_DEV
>
> Then btrfs will always show the lowest devid in /proc/mounts to maintain
> consistency, so even though we do mount /dev/sda $SCRATCH_MNT, you will see
> /dev/sdb as the mounted device in /proc/mounts. So then say the next test wants
> to just use $SCRATCH_DEV, it will do _require_scratchdev which will check to see
> if $SCRATCH_DEV is mounted, which it will look like it is not because
> /proc/mounts shows /dev/sdb instead of /dev/sda, and so it won't umount
> $SCRATCH_MNT, and then that test will fail because we can't mkfs the device
> because it is busy. I reproduced this on a box that doesn't use /etc/mtab by
> doing
>
> ./check btrfs/307 generic/015
>
> and 015 would fail. With this patch it passes now. Thanks,
>
> Signed-off-by: Josef Bacik <jbacik@xxxxxxxxxxxx>
> ---
> tests/btrfs/307 | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/tests/btrfs/307 b/tests/btrfs/307
> index 87314c6..15157b3 100644
> --- a/tests/btrfs/307
> +++ b/tests/btrfs/307
> @@ -35,6 +35,7 @@ _cleanup()
> {
> cd /
> rm -f $tmp.*
> + umount $SCRATCH_MNT
> }
>
> # get standard environment, filters and checks
>
This seems fine for this particular test.
Is it really a hard requirement that each test unmount SCRATCH_[DEV|MNT] if it used it?
If so, fine... the README does indicate this.
But I wonder if we can make it a little more foolproof by updating _require_scratch
to handle this situation more gracefully?
-Eric
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