我的 mount 命令不接受该user_xattr标志。我nfs-common还没有准备好吗？
安装失败：
root@client:/# mount.nfs4 -vvvv nas:/tank /tank -o vers=4.2,user_xattr
mount.nfs4: timeout set for Wed Dec 2 17:41:51 2020
mount.nfs4: trying text-based options 'vers=4.2,user_xattr,addr=192.168.11.1,clientaddr=192.168.11.2'
mount.nfs4: mount(2): Invalid argument
mount.nfs4: an incorrect mount option was specified
正在运行（在客户端和 NAS 上）
Linux client 5.9.0-3-amd64 #1 SMP Debian 5.9.9-1 (2020-11-19) x86_64 GNU/Linux- 操作系统：
Debian Linux bullseye/sid
软件包：
ii nfs-common 1:1.3.4-4 amd64 NFS support files common to client and server
ii nfs-kernel-server 1:1.3.4-4 amd64 support for NFS kernel server
资料来源：
答案1
您不需要任何额外的挂载选项来使 xattrs 工作（这是 Fedora 上的示例，但应该没有区别）
# uname -a
Linux nairi 5.9.10-200.fc33.x86_64 #1 SMP Mon Nov 23 18:12:50 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
# mount -vvvv lab007:/ /mnt/
mount.nfs: timeout set for Thu Dec 3 09:03:35 2020
mount.nfs: trying text-based options 'vers=4.2,addr=a.b.c.d,clientaddr=a.b.c.d
# cd /mnt/exports/data
# attr -l .
Attribute "dcache.tag.foo-tag" has a 4 byte value for .
Attribute "dcache.tag.OSMTemplate" has a 15 byte value for .
Attribute "dcache.tag.sGroup" has a 5 byte value for .
# attr -g dcache.tag.sGroup .
"dcache.tag.sGroup" had a 5 byte value for .:
sla2
确保导出的文件系统支持 xattr。