Re: generic name for volume and subvolume root?

[Hugo Mills <hugo@carfax.org.uk>]

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On Sat, Sep 09, 2017 at 10:35:51AM +0200, Ulli Horlacher wrote:
> As I am writing some documentation abount creating snapshots:
> Is there a generic name for both volume and subvolume root?
> 
> Example:
> 
> root@fex:~# btrfs subvol show /mnt
> ERROR: not a subvolume: /mnt
> 
> root@fex:~# btrfs subvol show /mnt/test
> /mnt/test is toplevel subvolume
> 
> root@fex:~# btrfs subvol show /mnt/test/data
> /mnt/test/data
>         Name:                   data
>         UUID:                   b32a5949-dfd6-ef45-8616-34ae4cdf6fb8
> (...)
> 
> root@fex:~# btrfs subvol show /mnt/test/data/sw
> ERROR: not a subvolume: /mnt/test/data/sw
> 
> 
> I can create snapshots of /mnt/test and /mnt/test/data, but not of /mnt
> and /mnt/test/data/sw
> 
> Is there a simple name for directories I can snapshot?

   Subvolume. If you can snapshot it, it's a subvolume. Some
subvolumes are also snapshots. (And all snapshots are subvolumes).

   The subvolume with ID 5 (or ID 0, which is an alias) is the "top
level subvolume", and has the unique property that it can't be
renamed, deleted or replaced, where all other subvolumes can be.

   Hugo.

-- 
Hugo Mills             | Well, you don't get to be a kernel hacker simply by
hugo@... carfax.org.uk | looking good in Speedos.
http://carfax.org.uk/  |
PGP: E2AB1DE4          |                                         Rusty Russell

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