Re: list all subvolumes below given path?

[Ulli Horlacher <framstag@rus.uni-stuttgart.de>]

On Tue 2024-05-14 (11:11), Andrei Borzenkov wrote:

> > I need to know all subvolumes below a given path.
> 
> That is rather vague.
> 
> Any number of different btrfs filesystems can be mounted below any
> given path. You conflate "mount point" with "btrfs path". Can you
> describe more precisely what you mean?

Sorry to be unprecise.
I mean all subvolumes of the given btrfs filsystem, but excluding other
filsystems (mount points).

In my example: I want to list all subvolmes of the /local filesystem below
$PWD:

root@fex:/local/test# mount | grep /local
/dev/sde1 on /local type btrfs (rw,relatime,space_cache,user_subvol_rm_allowed,subvolid=5,subvol=/)

find does not help me, because it also lists subvolumes of other file
systems which may be mounted below (not there in my example) and option
-xdev excludes subvolumes:

root@fex:/local/test# find . -inum 256 
.
./sv1
./sv1/sv1_1
./sv1/sv1_1/ss
./sv1/sv1_2
./sv2

root@fex:/local/test# find . -xdev -inum 256
.
./sv1
./sv2



> You parse the current mount table to find out what subvolume contains
> $PWD. But again - you may have arbitrary subvolumes from the same and
> different filesystems mounted anywhere below $PWD and you only can
> find it out by parsing the current mount table.

This was my apprehension :-}


-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK
Universitaet Stuttgart         E-Mail: horlacher@tik.uni-stuttgart.de
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70569 Stuttgart (Germany)      WWW:    https://www.tik.uni-stuttgart.de/
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