kern/144447: [ZFS] sharenfs fsunshare() & fsshare_main() non functiional.

[jhell]

>Number:         144447
>Category:       kern
>Synopsis:       [ZFS] sharenfs fsunshare() & fsshare_main() non functiional.
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Mar 03 13:10:04 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     jhell
>Release:        >= stable/7 r204486 Sun Feb 28 19:42:46 EST 2010
>Organization:
>Environment:
FreeBSD 7.3-STABLE #0 r204486 Sun Feb 28 19:42:46 EST 2010
BRANCH_OVERRIDE=STABLE
>Description:
After exporting some filesystems from zfs via sharenfs I decided to turn the shares back off after I was done with them on another machine. To my surprise the datasets that I had shared previously were still shared.

Process:

# This command adds the share through nfs in /etc/zfs/exports
zfs set sharenfs='-maproot=0 disbatch' exports/svn

bla bla bla after using them for a little while:

# This command should turn off the nfs share and remove the line from
# /etc/zfs/exports and signal mountd or whatever.
zfs set sharenfs=off exports/svn

Low and behold this line is never removed the share and continues even through a reboot all while sharenfs=off on the dataset. No no other datasets are shared at this time.

The line in /etc/zfs/exports changes just fine when changing the options via "zfs set sharenfs".

I also removed /etc/zfs/exports and repeated the process. It still continued. Also have destroyed datasets and the nfs share still exists.

Can someone take a look at this ?.
>How-To-Repeat:
# This command adds the nfs share in /etc/zfs/exports
zfs set sharenfs='-maproot=0 disbatch' exports/svn

# This command should turn off the nfs share and remove the line from
# /etc/zfs/exports and signal mountd or whatever.
zfs set sharenfs=off exports/svn

>Fix:
No known fix available at the moment.

It does not look like fsunshare() is being called from the little time that I actually had to debug this problem before the report.

>Release-Note:
>Audit-Trail:
>Unformatted: