• Jeff Layton's avatar
    nfs: when attempting to open a directory, fall back on normal lookup (try #5) · 1788ea6e
    Jeff Layton authored
    commit d953126a changed how nfs_atomic_lookup handles an -EISDIR return
    from an OPEN call. Prior to that patch, that caused the client to fall
    back to doing a normal lookup. When that patch went in, the code began
    returning that error to userspace. The d_revalidate codepath however
    never had the corresponding change, so it was still possible to end up
    with a NULL ctx->state pointer after that.
    
    That patch caused a regression. When we attempt to open a directory that
    does not have a cached dentry, that open now errors out with EISDIR. If
    you attempt the same open with a cached dentry, it will succeed.
    
    Fix this by reverting the change in nfs_atomic_lookup and allowing
    attempts to open directories to fall back to a normal lookup
    
    Also, add a NFSv4-specific f_ops->open routine that just returns
    -ENOTDIR. This should never be called if things are working properly,
    but if it ever is, then the dprintk may help in debugging.
    
    To facilitate this, a new file_operations field is also added to the
    nfs_rpc_ops struct.
    
    Cc: stable@kernel.org
    Signed-off-by: default avatarJeff Layton <jlayton@redhat.com>
    Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
    1788ea6e
file.c 24.8 KB