I try to take a snapshot of a single directory, e.g. root:

> btrfsctl -s root.2010-01-12 /root
operation complete
Btrfs v0.19-4-gab8fb4c-dirty

Then I take look what's inside the newly created snapshot:

> ls -l /root.2010-01-12/
total 0
drwxr-xr-x 1 root root 1192 2010-01-03 20:32:12 bin
drwxr-xr-x 1 root root   76 2009-06-25  0:40:35 boot
drwxr-xr-x 1 root root 1756 2010-01-12  2:33:07 cmds
drwxr-xr-x 1 root root    0 2010-01-06 12:21:46 data
drwxr-xr-x 1 root root 4356 2010-01-12  2:07:00 dev
drwxr-xr-x 1 root root   42 2010-01-04 12:29:45 downloads
drwxr-xr-x 1 root root 4528 2010-01-12  2:12:12 etc
drwxr-xr-x 1 root root   52 2010-01-11 12:57:47 home
drwxr-xr-x 1 root root    0 2007-11-10  4:44:07 initrd
drwxr-xr-x 1 root root 4490 2010-01-05 20:15:53 lib
drwxr-xr-x 1 root root  124 2008-04-27 14:53:39 mnt
drwxr-xr-x 1 root root   62 2008-01-08  0:21:58 net
drwxr-xr-x 1 root root    0 2008-04-09  3:19:16 objects
drwxr-xr-x 1 root root  316 2009-12-28 23:23:13 opt
dr-xr-xr-x 1 root root    0 2007-11-10  3:35:28 proc
drwxr-xr-x 1 root root 7676 2010-01-11  0:35:41 root
drwxr-xr-x 1 root root    0 2010-01-12  1:56:17 save
drwxr-xr-x 1 root root    0 2010-01-12  1:55:58 save2
drwxr-xr-x 1 root root 3804 2010-01-06  2:36:08 sbin
drwxr-xr-x 1 root root    0 2007-11-10  3:35:28 sys
drwxr-xr-x 1 root root  358 2010-01-11 18:44:29 tmp
drwxr-xr-x 1 root root  176 2009-12-29 17:08:37 usr
drwxr-xr-x 1 root root   72 2010-01-05 20:03:00 var

It seems that always a snapshot of the root is taken instead one of the
specified directory? Is this by design?

Snapshotting the root works fine, but if you take several snapshots it's a bit
"recursive", because every new snapshot contains all previous snapshots.

Greetings, Michael
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