On Wed, Sep 15, 2010 at 15:37, Chris Ball <cjb@xxxxxxxxxx> wrote:
...
> > Why not just do:
> > # btrfs subvolume delete /path/to/subvolume1
> > # btrfs subvolume delete /path/to/subvolume2
> > # sync
>
> Or even better, "btrfs filesystem sync <path>".
>
> I'm assuming that the caller wants to wait until the subvol delete
> has happened, but is unwilling to wait until all other writes to the
> FS have finished, and is even more unwilling to wait for all writes
> on the rest of the system to finish.
>
> I don't know whether that's actually a reasonable/plausible use case,
> though.
I think so, because I have that use case (sorta). I have a home
fileserver with btrfs, and a cron job on that machine runs hourly,
taking snapshots. However, once the disk fills up, I want to delete
the oldest snapshots:
while [[ disk > xx% full ]]; do
btrfs subvol delete /the/oldest/snapshot
wait for space to free up
done
If delete does not wait to free space, I'll delete too many snapshots.
But if I force a filesystem-wide sync after every delete, the loop
may take longer, which on a system busier than mine could take more
than the hour to complete.
-- Josh
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