To: ~alpine/users@lists.alpinelinux.org
From: Max Mopp <max.m.mopp@gmail.com>
Subject: nfs export zfs - mount -t nfs does not return
Message-ID: <2a583eb5-7e2d-d3d6-385a-d2976bcbfe16@gmail.com>
Date: Fri, 23 Apr 2021 12:17:15 +0200
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Hi,

I run 3.14.0_alpha20210212 with 5.10.31-0-lts #1-Alpine SMP x86_64 Linux
and have a problem sharing zfs filesystems via nfs. My test setting:

1. nfs sharing a ext4 directory works:
/etc/exports
    # /etc/exports
    #
    # See exports(5) for a description.

    # use exportfs -arv to reread
    /home/share/test2 *(sync,rw,no_subtree_check,insecure)
exportfs -arv
mount -t nfs -s -v localhost:/home/share/test2  /mnt/test2
ls /mnt/test2/
    test.txt

2. sharing a zfs fs does not:
I create to diskimages, pool and fs:
dd if=/dev/zero of=/home/zfsdisks/disk1 bs=4096 count=100000
dd if=/dev/zero of=/home/zfsdisks/disk2 bs=4096 count=100000
zpool create -o ashift=12 -O compression=on -fm /home/share/test1 test1
mirror /home/zfsdisks/disk1 /home/zfsdisks/disk2
zpool status
      pool: test1
     state: ONLINE
    config:

        NAME                      STATE     READ WRITE CKSUM
        test1                     ONLINE       0     0     0
          mirror-0                ONLINE       0     0     0
            /home/zfsdisks/disk1  ONLINE       0     0     0
            /home/zfsdisks/disk2  ONLINE       0     0     0

    errors: No known data errors
zfs create test1/testfs
echo "iwashere" > /home/share/test1/testfs/file.txt
zfs set canmount=on test1/testfs
zfs set sharenfs="rw=*,insecure" test1/testfs
cat /etc/exports.d/zfs.exports
    # !!! DO NOT EDIT THIS FILE MANUALLY !!!

    /home/share/test1/testfs
*(sec=sys,rw,no_subtree_check,mountpoint,insecure)
rc-service nfs restart

mount -t nfs -s -v localhost:/home/share/test1/testfs  /mnt/test1
... never returns
no logs no errors, no mount
Same on x86_64 stable

the same does work an arch linux (endevouros)

anybody an idea what is wrong here?
Thanks