On Tue 2017-08-22 (11:03), Austin S. Hemmelgarn wrote:
> Or alternatively, repeatedly call `btrfs filesystem show` on the path,
> removing one component from the end each time until you get a zero
> return code. The path you called it on that got a zero return code is
> where the mount is (and thus what filesystem that subvolume is part of),
> and the output just gave you a list of devices it's on.
"btrfs filesystem show" is relative slow (2.6 s),
"btrfs subvolume show" is MUCH faster (0.02 s).
In perl I have now:
$root = $volume;
while (`btrfs subvolume show "$root" 2>/dev/null` !~ /toplevel subvolume/) {
$root = dirname($root);
last if $root eq '/';
}
--
Ullrich Horlacher Server und Virtualisierung
Rechenzentrum TIK
Universitaet Stuttgart E-Mail: horlacher@xxxxxxxxxxxxxxxxxxxx
Allmandring 30a Tel: ++49-711-68565868
70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/
REF:<62494c0c-0c27-5b36-3727-b8755eb2cb58@xxxxxxxxx>
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