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    Subject[PATCH 1/5] NFS: handle blocklayout pipe PipeFS dentry by network namespace aware routines
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    This patch makes blocklayout pipe dentry allocated and destroyed in network
    namespace context by PipeFS network namespace aware routines.
    Network namespace context is obtained from nfs_client structure.

    Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>

    ---
    fs/nfs/blocklayout/blocklayout.c | 60 +++++++++++++++++++++++++++++++-------
    1 files changed, 49 insertions(+), 11 deletions(-)
    diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
    index c26633e..50d5183 100644
    --- a/fs/nfs/blocklayout/blocklayout.c
    +++ b/fs/nfs/blocklayout/blocklayout.c
    @@ -965,10 +965,55 @@ static const struct rpc_pipe_ops bl_upcall_ops = {
    .destroy_msg = bl_pipe_destroy_msg,
    };

    +static struct dentry *nfs4blocklayout_register_sb(struct super_block *sb,
    + struct rpc_pipe *pipe)
    +{
    + struct dentry *dir, *dentry;
    +
    + dir = rpc_d_lookup_sb(sb, NFS_PIPE_DIRNAME);
    + if (dir == NULL)
    + return ERR_PTR(-ENOENT);
    + dentry = rpc_mkpipe_dentry(dir, "blocklayout", NULL, pipe);
    + dput(dir);
    + return dentry;
    +}
    +
    +static void nfs4blocklayout_unregister_sb(struct super_block *sb,
    + struct rpc_pipe *pipe)
    +{
    + if (pipe->dentry)
    + rpc_unlink(pipe->dentry);
    +}
    +
    +static struct dentry *nfs4blocklayout_register_net(struct net *net,
    + struct rpc_pipe *pipe)
    +{
    + struct super_block *pipefs_sb;
    + struct dentry *dentry;
    +
    + pipefs_sb = rpc_get_sb_net(net);
    + if (!pipefs_sb)
    + return ERR_PTR(-ENOENT);
    + dentry = nfs4blocklayout_register_sb(pipefs_sb, pipe);
    + rpc_put_sb_net(net);
    + return dentry;
    +}
    +
    +static void nfs4blocklayout_unregister_net(struct net *net,
    + struct rpc_pipe *pipe)
    +{
    + struct super_block *pipefs_sb;
    +
    + pipefs_sb = rpc_get_sb_net(net);
    + if (pipefs_sb) {
    + nfs4blocklayout_unregister_sb(pipefs_sb, pipe);
    + rpc_put_sb_net(net);
    + }
    +}
    +
    static int __init nfs4blocklayout_init(void)
    {
    struct vfsmount *mnt;
    - struct path path;
    int ret;

    dprintk("%s: NFSv4 Block Layout Driver Registering...\n", __func__);
    @@ -984,20 +1029,13 @@ static int __init nfs4blocklayout_init(void)
    ret = PTR_ERR(mnt);
    goto out_remove;
    }
    -
    - ret = vfs_path_lookup(mnt->mnt_root,
    - mnt,
    - NFS_PIPE_DIRNAME, 0, &path);
    - if (ret)
    - goto out_remove;
    -
    bl_device_pipe = rpc_mkpipe_data(&bl_upcall_ops, 0);
    if (IS_ERR(bl_device_pipe)) {
    ret = PTR_ERR(bl_device_pipe);
    goto out_remove;
    }
    - bl_device_pipe->dentry = rpc_mkpipe_dentry(path.dentry, "blocklayout",
    - NULL, bl_device_pipe);
    + bl_device_pipe->dentry = nfs4blocklayout_register_net(&init_net,
    + bl_device_pipe);
    if (IS_ERR(bl_device_pipe->dentry)) {
    ret = PTR_ERR(bl_device_pipe->dentry);
    goto out_destroy_pipe;
    @@ -1018,7 +1056,7 @@ static void __exit nfs4blocklayout_exit(void)
    __func__);

    pnfs_unregister_layoutdriver(&blocklayout_type);
    - rpc_unlink(bl_device_pipe->dentry);
    + nfs4blocklayout_unregister_net(&init_net, bl_device_pipe);
    rpc_destroy_pipe_data(bl_device_pipe);
    }



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