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Date:      Mon, 20 Dec 2021 17:12:52 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 260507] FreeBSD 13.0: zfs snapshot does not store a snapshot in the .zfs/snapshot directory
Message-ID:  <bug-260507-3630-0yRImIVrG5@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-260507-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-260507-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D260507

--- Comment #5 from Yonas Yanfa <yonas.yanfa@gmail.com> ---
(In reply to Andriy Gapon from comment #4)

For some reason, this test passes successfully on zroot, but not on my seco=
nd
pool called 'backups':

$ zfs create zroot/test
$ echo 'some content' | tee /zroot/test/blah
$ zfs set snapdir=3Dvisible zroot/test
$ zfs snapshot zroot/test@now
$ find /zroot/test/.zfs/
$ find /zroot/test/.zfs/snapshot/now/blah
$ cat /zroot/test/.zfs/snapshot/now/blah
$ truncate -s0 /zroot/test/blah
$ zfs rollback zroot/test@now
$ if [ -s /zroot/test/blah ] ; then echo 'Test passed successfully.'; else =
echo
'Test failed.' ; fi


Here's a diff between the two pools list of properties:

--- k.backups   2021-12-20 11:59:48.707273000 -0500
+++ k.zroot     2021-12-20 11:46:29.929758000 -0500
@@ -1,15 +1,15 @@
 NAME     PROPERTY              VALUE                  SOURCE
 type                  filesystem             -
-creation              Wed Dec 15 17:39 2021  -
-used                  1.43M                  -
-available             9.20G                  -
-referenced            260K                   -
-compressratio         1.15x                  -
+creation              Wed Dec 15 16:56 2021  -
+used                  977M                   -
+available             6.31G                  -
+referenced            96K                    -
+compressratio         1.90x                  -
 mounted               yes                    -
 quota                 none                   default
 reservation           none                   default
 recordsize            128K                   default
-mountpoint            /backups               default
+mountpoint            /zroot                 local
 sharenfs              off                    default
 checksum              on                     default
 compression           lz4                    local
@@ -35,12 +35,12 @@
 sharesmb              off                    default
 refquota              none                   default
 refreservation        none                   default
-guid                  1789944234026602685    -
+guid                  3029096334883593733    -
 primarycache          all                    default
 secondarycache        all                    default
 usedbysnapshots       0B                     -
-usedbydataset         260K                   -
-usedbychildren        1.17M                  -
+usedbydataset         96K                    -
+usedbychildren        977M                   -
 usedbyrefreservation  0B                     -
 logbias               latency                default
 objsetid              54                     -
@@ -48,10 +48,10 @@
 mlslabel              none                   default
 sync                  standard               default
 dnodesize             legacy                 default
-refcompressratio      1.70x                  -
-written               260K                   -
-logicalused           606K                   -
-logicalreferenced     198K                   -
+refcompressratio      1.00x                  -
+written               96K                    -
+logicalused           1.70G                  -
+logicalreferenced     42.5K                  -
 volmode               default                default
 filesystem_limit      none                   default
 snapshot_limit        none                   default


Output of `zfs list`:

backups                    1.44M  9.20G      260K  /backups
backups/nfs                 192K  9.20G       96K  /backups/nfs
backups/nfs/new-documents    96K  9.20G       96K  /backups/nfs/new-documen=
ts
zroot                      1.01G  6.26G      104K  /zroot
zroot/ROOT                 1024M  6.26G       96K  none
zroot/ROOT/default         1024M  6.26G     1024M  /
zroot/test                  500K  6.26G      500K  /zroot/test
zroot/tmp                   128K  6.26G      128K  /tmp
zroot/usr                  1.83M  6.26G       96K  /usr
zroot/usr/home             1.55M  6.26G     1.55M  /usr/home
zroot/usr/ports              96K  6.26G       96K  /usr/ports
zroot/usr/src                96K  6.26G       96K  /usr/src
zroot/var                   884K  6.26G       96K  /var
zroot/var/audit              96K  6.26G       96K  /var/audit
zroot/var/crash              96K  6.26G       96K  /var/crash
zroot/var/log               396K  6.26G      396K  /var/log
zroot/var/mail              104K  6.26G      104K  /var/mail
zroot/var/tmp                96K  6.26G       96K  /var/tmp

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