问题
I have an NFS_Server - NFS_Client system. My client is mounted to an NFS_Server directory. I want to change the attribute of NFS_Server directory's files via NFS_Client mounted directory by using Extended File Attributes (xattr).
When I tried to set an attribute from the client side, it gives the following answer:
root@ubuntu:/mnt/nfs/var/nfs# setfattr -n user.comment -v "some comment" test.txt
setfattr: nfs.txt: Permission denied
My question is:
is it possible to use Extended File Attributes via NFS?
if possible, how can I do this?
UPDATE:
Server side:
$ more /etc/exports file has:
/var/nfs 192.168.56.123(rw,sync,no_subtree_check)
Client side:
$ root@ubuntu:/# mount -t nfs
192.168.56.130:/var/nfs on /mnt/nfs/var/nfs type nfs (rw,vers=4,addr=192.168.56.130,clientaddr=192.168.56.123)
thank you...
回答1:
You can use fuse_xattrs (a fuse filesystem layer) to emulate extended attributes (xattrs) on NFS shares. Basically you have to do:
- mount the NFS share. e.g.:
/mnt/shared_data - mount the fuse xattr layer:
$ fuse_xattrs /mnt/shared_data /mnt/shared_data_with_xattrs
Now all the files on /mnt/shared_data can be accessed on /mnt/shared_data_with_xattrs with xattrs support. The extended attributes will be stored on sidecar files. The extended attributes are not going to be stored on the server filesystem as extended attributes, they are going to be stored in sidecar files.
Sadly this is only a work-around.
disclaimer: I'm the author of fuse_xattrs.
回答2:
(This article is old, but I came across this article when looking for this functionality, and it doesn't represent the current state.)
As others have mentioned, there is no support for extended attributes in NFS. However, there is significant interest in it, to the extent there is a proposed standard (RFC 8276).
回答3:
Extended attributes are not supported by nfs.There is no handler for user attributes in nfs kernel module.For more information read RFC for nfsv4.
来源：https://stackoverflow.com/questions/24629459/how-to-use-extended-file-attributes-on-nfs