Hi, > > OK thanks for the information. I think they will just work in nfs-ganesha as > long as the snapshots or subvols are mounted within an nfs-ganesha export or > are exported explicitly. nfs-ganesha has the equivalent of knfsd's > nohide/crossmnt options and when nfs-ganesha detects crossing a filesystem > boundary will lookup the filesystem via getmntend and listing btrfs subvols > and then expose that filesystem (via the fsid attribute) to the clients > where at least the Linux nfs client will detect a filesystem boundary and > create a new mount entry for it. Not only exported explicitly, but also kept in the same hierarchy. If we export /mnt/test #the btrfs /mnt/test/sub1 # the btrfs subvol 1 /mnt/test/sub2 # the btrfs subvol 2 we need to make sure we will not access '/mnt/test/sub1' through '/mnt/test' from nfs client. current safe export: #/mnt/test #the btrfs, not exported /mnt/test/sub1 # the btrfs subvol 1 /mnt/test/sub2 # the btrfs subvol 2 Best Regards Wang Yugui (wangyugui@xxxxxxxxxxxx) 2021/06/22
