Replacing or merging last snapshot

Replacing or merging last snapshot

[George Shuklin]

I wonder if there is a way to free space if there is only one snapshot 
available. The problem is that there is a hidden top-level (id=5) 
subvolume, and there was ever switch from top-level to another subvolume 
as 'default'. If top-level subvolume have some data (not present in 
'default' snapshot), this space is wasted.

Are there way to 'merge' snapshot into top-level subvolume, or a way to 
completely remove subvolume 5 (without breaking fs)?

Re: Replacing or merging last snapshot

[Hugo Mills]

On Sat, Aug 22, 2020 at 02:48:18PM +0300, George Shuklin wrote:
> I wonder if there is a way to free space if there is only one snapshot
> available. The problem is that there is a hidden top-level (id=5) subvolume,
> and there was ever switch from top-level to another subvolume as 'default'.
> If top-level subvolume have some data (not present in 'default' snapshot),
> this space is wasted.
> 
> Are there way to 'merge' snapshot into top-level subvolume, or a way to
> completely remove subvolume 5 (without breaking fs)?

   You can't remove the top-level subvolume (id 5). All you can do is
mount it (with -o subvolid=5 or =0) and (carefully) delete the parts
that you don't need. Remember that all the other subvolumes are
visible in this view, so don't just rm -rf *, because you'll delete
everything in the FS including your currently active subvols.

   Hugo.

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