• Trond Myklebust's avatar
    NFS: Add the mount option "nosharecache" · 75180df2
    Trond Myklebust authored
    Prior to David Howell's mount changes in 2.6.18, users who mounted
    different directories which happened to be from the same filesystem on the
    server would get different super blocks, and hence could choose different
    mount options. As long as there were no hard linked files that crossed from
    one subtree to another, this was quite safe.
    Post the changes, if the two directories are on the same filesystem (have
    the same 'fsid'), they will share the same super block, and hence the same
    mount options.
    
    Add a flag to allow users to elect not to share the NFS super block with
    another mount point, even if the fsids are the same. This will allow
    users to set different mount options for the two different super blocks, as
    was previously possible. It is still up to the user to ensure that there
    are no cache coherency issues when doing this, however the default
    behaviour will be to share super blocks whenever two paths result in
    the same fsid.
    Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
    75180df2
nfs4_mount.h 1.85 KB