zfs discuss - Mar 2008 - ZFS mountpoints

Hello all,
 Sorry if that is a "stupid" question, but i need to ask..
 I have some zfs filesystems with two "//" at the beggining like
"//dir1/dir2/dir3. And some other filesystems "correct" with just
one "/" (/dir1/dir2/).
 The question is: Can i set the mountpoint correctly? i mean, rewrite the
property mount point to /dir1/dir2/dir3?
 That was just a bug in ZFS, or for "some" reason i should not touch
it?

 Thanks!
 
 
This message posted from opensolaris.org

On Sun, 23 Mar 2008, msl wrote:
> I have some zfs filesystems with two "//" at the beggining like 
> "//dir1/dir2/dir3. And some other filesystems "correct" with
just one
> "/" (/dir1/dir2/). The question is: Can i set the mountpoint
correctly?
You can set the mountpoint at any time with ''zfs set
mountpoint=/dir1/dir2
<dataset>''

-bash-3.2# zfs create tank/filesystem
-bash-3.2# zfs get mountpoint tank/filesystem
NAME             PROPERTY    VALUE             SOURCE
tank/filesystem  mountpoint  /tank/filesystem  default
-bash-3.2# zfs set mountpoint=//dir1/dir2 tank/filesystem
-bash-3.2# zfs get mountpoint tank/filesystem
NAME             PROPERTY    VALUE            SOURCE
tank/filesystem  mountpoint  //dir1/dir2      local
-bash-3.2# zfs set mountpoint=/dir1/dir2 tank/filesystem
-bash-3.2# zfs get mountpoint tank/filesystem
NAME             PROPERTY    VALUE            SOURCE
tank/filesystem  mountpoint  /dir1/dir2       local
-bash-3.2#

Note that if you set a mountpoint with a trailing / character, that / is 
propagated to all datasets which inherit the mountpoint:

-bash-3.2# zfs create tank/filesystem/child
-bash-3.2# zfs get mountpoint tank/filesystem/child
NAME                   PROPERTY    VALUE                  SOURCE
tank/filesystem/child  mountpoint  /dir1/dir2/child       inherited from
tank/filesystem
-bash-3.2# zfs set mountpoint=/dir1/dir2/ tank/filesystem
-bash-3.2# zfs get mountpoint tank/filesystem/child
NAME                   PROPERTY    VALUE                  SOURCE
tank/filesystem/child  mountpoint  /dir1/dir2//child      inherited from
tank/filesystem
-bash-3.2#

As a result of the inheritance, you get the double-/ in the middle of the 
mountpoint name.


Regards,
markm