Solved Files not showing up in .zfs/snapshot

C

cicero

Hi all, I run FreeBSD 12.2-RELEASE-p7 and have a zfs pool
since several years. Here is something I stumbled upon a
few days ago and that I don't quite understand about the
.zfs/snapshot dirs:

One of the zfs file systems is pool1/backup/media:

If I do a ls -al isos/ in there I get

Code: 
total 9280653
drwxr-xr-x  3 root  wheel           6 Mar 16  2019 ./
drwxr-xr-x  9 root  wheel          10 Mar  8 12:44 ../
-rw-r--r--  1 root  wheel  2344517632 Jan 12  2011 cd1.iso
-rw-r--r--  1 root  wheel  4602724352 Aug 10  2012 cd2.iso
-rw-r--r--  1 root  wheel  2849210368 Oct 14  2011 cd3.iso
drwxr-xr-x  2 root  wheel           4 Mar 12  2019 cd4/

If I cd into /pool1/backup/media/.zfs/snapshot/2021-06-07_1656
and do a ls -al isos/ there I get:

Code: 
total 16
drwxr-xr-x  2 root  wheel   2 Jan 21  2017 ./
drwxr-xr-x  9 root  wheel  10 Mar  8 12:44 ../

The files are in my pool since some time already and have
been there prior to creating the snapshot. Why don't I see
them in the snapshot-dir? This does not happen for all
subdirs. I have another dir, where I see the files in
the normal filesystem as well as in the snapshot dir. What
am I missing here?

Best,
Thomas
 
I was puzzled for some days, yesterday I posted my question above, just now I figured it out myself... The solution is that the isos subdir has an additional corresponding filesystem pool1/backup/media/isos. If I cd into /pool1/backup/media/isos/.zfs/snapshot/2021-06-07_1656 and do an ls there I see all files as expected.
 
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