Re: [PATCH] nfsd: remove support for nfsdcld

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On Mon, Apr 01, 2013 at 11:53:53AM +0400, Stanislav Kinsbursky wrote:
> 22.03.2013 16:57, Jeff Layton пишет:
> >...as advertised for 3.10.
> >
> 
> It looks like UMH should be containerised as fast as possible, doesn't it?
> Bruce, don't you know, how much time left before 3.10 merge window?

"A few weeks" (http://lwn.net/Articles/545399/), but as usual it's good
to have everything lined up in -next before then.

Thanks for asking about this, that is indeed my one remaining concern
before ripping this out....

--b.

> >Cc: Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx>
> >Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
> >---
> >  fs/nfsd/nfs4recover.c          | 492 +----------------------------------------
> >  fs/nfsd/nfsctl.c               |   8 +-
> >  fs/nfsd/nfsd.h                 |   5 -
> >  include/uapi/linux/nfsd/Kbuild |   1 -
> >  include/uapi/linux/nfsd/cld.h  |  56 -----
> >  5 files changed, 6 insertions(+), 556 deletions(-)
> >  delete mode 100644 include/uapi/linux/nfsd/cld.h
> >
> >diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
> >index 899ca26..4e7f47e 100644
> >--- a/fs/nfsd/nfs4recover.c
> >+++ b/fs/nfsd/nfs4recover.c
> >@@ -42,7 +42,6 @@
> >  #include <net/net_namespace.h>
> >  #include <linux/sunrpc/rpc_pipe_fs.h>
> >  #include <linux/sunrpc/clnt.h>
> >-#include <linux/nfsd/cld.h>
> >
> >  #include "nfsd.h"
> >  #include "state.h"
> >@@ -625,426 +624,6 @@ static struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
> >  	.grace_done	= nfsd4_recdir_purge_old,
> >  };
> >
> >-/* Globals */
> >-#define NFSD_PIPE_DIR		"nfsd"
> >-#define NFSD_CLD_PIPE		"cld"
> >-
> >-/* per-net-ns structure for holding cld upcall info */
> >-struct cld_net {
> >-	struct rpc_pipe		*cn_pipe;
> >-	spinlock_t		 cn_lock;
> >-	struct list_head	 cn_list;
> >-	unsigned int		 cn_xid;
> >-};
> >-
> >-struct cld_upcall {
> >-	struct list_head	 cu_list;
> >-	struct cld_net		*cu_net;
> >-	struct task_struct	*cu_task;
> >-	struct cld_msg		 cu_msg;
> >-};
> >-
> >-static int
> >-__cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
> >-{
> >-	int ret;
> >-	struct rpc_pipe_msg msg;
> >-
> >-	memset(&msg, 0, sizeof(msg));
> >-	msg.data = cmsg;
> >-	msg.len = sizeof(*cmsg);
> >-
> >-	/*
> >-	 * Set task state before we queue the upcall. That prevents
> >-	 * wake_up_process in the downcall from racing with schedule.
> >-	 */
> >-	set_current_state(TASK_UNINTERRUPTIBLE);
> >-	ret = rpc_queue_upcall(pipe, &msg);
> >-	if (ret < 0) {
> >-		set_current_state(TASK_RUNNING);
> >-		goto out;
> >-	}
> >-
> >-	schedule();
> >-	set_current_state(TASK_RUNNING);
> >-
> >-	if (msg.errno < 0)
> >-		ret = msg.errno;
> >-out:
> >-	return ret;
> >-}
> >-
> >-static int
> >-cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg)
> >-{
> >-	int ret;
> >-
> >-	/*
> >-	 * -EAGAIN occurs when pipe is closed and reopened while there are
> >-	 *  upcalls queued.
> >-	 */
> >-	do {
> >-		ret = __cld_pipe_upcall(pipe, cmsg);
> >-	} while (ret == -EAGAIN);
> >-
> >-	return ret;
> >-}
> >-
> >-static ssize_t
> >-cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
> >-{
> >-	struct cld_upcall *tmp, *cup;
> >-	struct cld_msg __user *cmsg = (struct cld_msg __user *)src;
> >-	uint32_t xid;
> >-	struct nfsd_net *nn = net_generic(filp->f_dentry->d_sb->s_fs_info,
> >-						nfsd_net_id);
> >-	struct cld_net *cn = nn->cld_net;
> >-
> >-	if (mlen != sizeof(*cmsg)) {
> >-		dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen,
> >-			sizeof(*cmsg));
> >-		return -EINVAL;
> >-	}
> >-
> >-	/* copy just the xid so we can try to find that */
> >-	if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) {
> >-		dprintk("%s: error when copying xid from userspace", __func__);
> >-		return -EFAULT;
> >-	}
> >-
> >-	/* walk the list and find corresponding xid */
> >-	cup = NULL;
> >-	spin_lock(&cn->cn_lock);
> >-	list_for_each_entry(tmp, &cn->cn_list, cu_list) {
> >-		if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) {
> >-			cup = tmp;
> >-			list_del_init(&cup->cu_list);
> >-			break;
> >-		}
> >-	}
> >-	spin_unlock(&cn->cn_lock);
> >-
> >-	/* couldn't find upcall? */
> >-	if (!cup) {
> >-		dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid);
> >-		return -EINVAL;
> >-	}
> >-
> >-	if (copy_from_user(&cup->cu_msg, src, mlen) != 0)
> >-		return -EFAULT;
> >-
> >-	wake_up_process(cup->cu_task);
> >-	return mlen;
> >-}
> >-
> >-static void
> >-cld_pipe_destroy_msg(struct rpc_pipe_msg *msg)
> >-{
> >-	struct cld_msg *cmsg = msg->data;
> >-	struct cld_upcall *cup = container_of(cmsg, struct cld_upcall,
> >-						 cu_msg);
> >-
> >-	/* errno >= 0 means we got a downcall */
> >-	if (msg->errno >= 0)
> >-		return;
> >-
> >-	wake_up_process(cup->cu_task);
> >-}
> >-
> >-static const struct rpc_pipe_ops cld_upcall_ops = {
> >-	.upcall		= rpc_pipe_generic_upcall,
> >-	.downcall	= cld_pipe_downcall,
> >-	.destroy_msg	= cld_pipe_destroy_msg,
> >-};
> >-
> >-static struct dentry *
> >-nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe)
> >-{
> >-	struct dentry *dir, *dentry;
> >-
> >-	dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR);
> >-	if (dir == NULL)
> >-		return ERR_PTR(-ENOENT);
> >-	dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe);
> >-	dput(dir);
> >-	return dentry;
> >-}
> >-
> >-static void
> >-nfsd4_cld_unregister_sb(struct rpc_pipe *pipe)
> >-{
> >-	if (pipe->dentry)
> >-		rpc_unlink(pipe->dentry);
> >-}
> >-
> >-static struct dentry *
> >-nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe)
> >-{
> >-	struct super_block *sb;
> >-	struct dentry *dentry;
> >-
> >-	sb = rpc_get_sb_net(net);
> >-	if (!sb)
> >-		return NULL;
> >-	dentry = nfsd4_cld_register_sb(sb, pipe);
> >-	rpc_put_sb_net(net);
> >-	return dentry;
> >-}
> >-
> >-static void
> >-nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe)
> >-{
> >-	struct super_block *sb;
> >-
> >-	sb = rpc_get_sb_net(net);
> >-	if (sb) {
> >-		nfsd4_cld_unregister_sb(pipe);
> >-		rpc_put_sb_net(net);
> >-	}
> >-}
> >-
> >-/* Initialize rpc_pipefs pipe for communication with client tracking daemon */
> >-static int
> >-nfsd4_init_cld_pipe(struct net *net)
> >-{
> >-	int ret;
> >-	struct dentry *dentry;
> >-	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
> >-	struct cld_net *cn;
> >-
> >-	if (nn->cld_net)
> >-		return 0;
> >-
> >-	cn = kzalloc(sizeof(*cn), GFP_KERNEL);
> >-	if (!cn) {
> >-		ret = -ENOMEM;
> >-		goto err;
> >-	}
> >-
> >-	cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
> >-	if (IS_ERR(cn->cn_pipe)) {
> >-		ret = PTR_ERR(cn->cn_pipe);
> >-		goto err;
> >-	}
> >-	spin_lock_init(&cn->cn_lock);
> >-	INIT_LIST_HEAD(&cn->cn_list);
> >-
> >-	dentry = nfsd4_cld_register_net(net, cn->cn_pipe);
> >-	if (IS_ERR(dentry)) {
> >-		ret = PTR_ERR(dentry);
> >-		goto err_destroy_data;
> >-	}
> >-
> >-	cn->cn_pipe->dentry = dentry;
> >-	nn->cld_net = cn;
> >-	return 0;
> >-
> >-err_destroy_data:
> >-	rpc_destroy_pipe_data(cn->cn_pipe);
> >-err:
> >-	kfree(cn);
> >-	printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n",
> >-			ret);
> >-	return ret;
> >-}
> >-
> >-static void
> >-nfsd4_remove_cld_pipe(struct net *net)
> >-{
> >-	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
> >-	struct cld_net *cn = nn->cld_net;
> >-
> >-	nfsd4_cld_unregister_net(net, cn->cn_pipe);
> >-	rpc_destroy_pipe_data(cn->cn_pipe);
> >-	kfree(nn->cld_net);
> >-	nn->cld_net = NULL;
> >-}
> >-
> >-static struct cld_upcall *
> >-alloc_cld_upcall(struct cld_net *cn)
> >-{
> >-	struct cld_upcall *new, *tmp;
> >-
> >-	new = kzalloc(sizeof(*new), GFP_KERNEL);
> >-	if (!new)
> >-		return new;
> >-
> >-	/* FIXME: hard cap on number in flight? */
> >-restart_search:
> >-	spin_lock(&cn->cn_lock);
> >-	list_for_each_entry(tmp, &cn->cn_list, cu_list) {
> >-		if (tmp->cu_msg.cm_xid == cn->cn_xid) {
> >-			cn->cn_xid++;
> >-			spin_unlock(&cn->cn_lock);
> >-			goto restart_search;
> >-		}
> >-	}
> >-	new->cu_task = current;
> >-	new->cu_msg.cm_vers = CLD_UPCALL_VERSION;
> >-	put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid);
> >-	new->cu_net = cn;
> >-	list_add(&new->cu_list, &cn->cn_list);
> >-	spin_unlock(&cn->cn_lock);
> >-
> >-	dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid);
> >-
> >-	return new;
> >-}
> >-
> >-static void
> >-free_cld_upcall(struct cld_upcall *victim)
> >-{
> >-	struct cld_net *cn = victim->cu_net;
> >-
> >-	spin_lock(&cn->cn_lock);
> >-	list_del(&victim->cu_list);
> >-	spin_unlock(&cn->cn_lock);
> >-	kfree(victim);
> >-}
> >-
> >-/* Ask daemon to create a new record */
> >-static void
> >-nfsd4_cld_create(struct nfs4_client *clp)
> >-{
> >-	int ret;
> >-	struct cld_upcall *cup;
> >-	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
> >-	struct cld_net *cn = nn->cld_net;
> >-
> >-	/* Don't upcall if it's already stored */
> >-	if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
> >-		return;
> >-
> >-	cup = alloc_cld_upcall(cn);
> >-	if (!cup) {
> >-		ret = -ENOMEM;
> >-		goto out_err;
> >-	}
> >-
> >-	cup->cu_msg.cm_cmd = Cld_Create;
> >-	cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
> >-	memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
> >-			clp->cl_name.len);
> >-
> >-	ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
> >-	if (!ret) {
> >-		ret = cup->cu_msg.cm_status;
> >-		set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
> >-	}
> >-
> >-	free_cld_upcall(cup);
> >-out_err:
> >-	if (ret)
> >-		printk(KERN_ERR "NFSD: Unable to create client "
> >-				"record on stable storage: %d\n", ret);
> >-}
> >-
> >-/* Ask daemon to create a new record */
> >-static void
> >-nfsd4_cld_remove(struct nfs4_client *clp)
> >-{
> >-	int ret;
> >-	struct cld_upcall *cup;
> >-	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
> >-	struct cld_net *cn = nn->cld_net;
> >-
> >-	/* Don't upcall if it's already removed */
> >-	if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
> >-		return;
> >-
> >-	cup = alloc_cld_upcall(cn);
> >-	if (!cup) {
> >-		ret = -ENOMEM;
> >-		goto out_err;
> >-	}
> >-
> >-	cup->cu_msg.cm_cmd = Cld_Remove;
> >-	cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
> >-	memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
> >-			clp->cl_name.len);
> >-
> >-	ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
> >-	if (!ret) {
> >-		ret = cup->cu_msg.cm_status;
> >-		clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
> >-	}
> >-
> >-	free_cld_upcall(cup);
> >-out_err:
> >-	if (ret)
> >-		printk(KERN_ERR "NFSD: Unable to remove client "
> >-				"record from stable storage: %d\n", ret);
> >-}
> >-
> >-/* Check for presence of a record, and update its timestamp */
> >-static int
> >-nfsd4_cld_check(struct nfs4_client *clp)
> >-{
> >-	int ret;
> >-	struct cld_upcall *cup;
> >-	struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
> >-	struct cld_net *cn = nn->cld_net;
> >-
> >-	/* Don't upcall if one was already stored during this grace pd */
> >-	if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
> >-		return 0;
> >-
> >-	cup = alloc_cld_upcall(cn);
> >-	if (!cup) {
> >-		printk(KERN_ERR "NFSD: Unable to check client record on "
> >-				"stable storage: %d\n", -ENOMEM);
> >-		return -ENOMEM;
> >-	}
> >-
> >-	cup->cu_msg.cm_cmd = Cld_Check;
> >-	cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len;
> >-	memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data,
> >-			clp->cl_name.len);
> >-
> >-	ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
> >-	if (!ret) {
> >-		ret = cup->cu_msg.cm_status;
> >-		set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
> >-	}
> >-
> >-	free_cld_upcall(cup);
> >-	return ret;
> >-}
> >-
> >-static void
> >-nfsd4_cld_grace_done(struct nfsd_net *nn, time_t boot_time)
> >-{
> >-	int ret;
> >-	struct cld_upcall *cup;
> >-	struct cld_net *cn = nn->cld_net;
> >-
> >-	cup = alloc_cld_upcall(cn);
> >-	if (!cup) {
> >-		ret = -ENOMEM;
> >-		goto out_err;
> >-	}
> >-
> >-	cup->cu_msg.cm_cmd = Cld_GraceDone;
> >-	cup->cu_msg.cm_u.cm_gracetime = (int64_t)boot_time;
> >-	ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg);
> >-	if (!ret)
> >-		ret = cup->cu_msg.cm_status;
> >-
> >-	free_cld_upcall(cup);
> >-out_err:
> >-	if (ret)
> >-		printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret);
> >-}
> >-
> >-static struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = {
> >-	.init		= nfsd4_init_cld_pipe,
> >-	.exit		= nfsd4_remove_cld_pipe,
> >-	.create		= nfsd4_cld_create,
> >-	.remove		= nfsd4_cld_remove,
> >-	.check		= nfsd4_cld_check,
> >-	.grace_done	= nfsd4_cld_grace_done,
> >-};
> >-
> >  /* upcall via usermodehelper */
> >  static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
> >  module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
> >@@ -1287,21 +866,14 @@ nfsd4_client_tracking_init(struct net *net)
> >  	 * then use the legacy ops.
> >  	 */
> >  	nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
> >-	status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
> >-	if (!status) {
> >-		status = S_ISDIR(path.dentry->d_inode->i_mode);
> >-		path_put(&path);
> >-		if (status)
> >-			goto do_init;
> >-	}
> >+	status = kern_path(nfs4_recoverydir(),
> >+				LOOKUP_FOLLOW|LOOKUP_DIRECTORY, &path);
> >+	if (status)
> >+		goto out_err;
> >
> >-	/* Finally, try to use nfsdcld */
> >-	nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
> >-	printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be "
> >-			"removed in 3.10. Please transition to using "
> >-			"nfsdcltrack.\n");
> >  do_init:
> >  	status = nn->client_tracking_ops->init(net);
> >+out_err:
> >  	if (status) {
> >  		printk(KERN_WARNING "NFSD: Unable to initialize client "
> >  				    "recovery tracking! (%d)\n", status);
> >@@ -1358,57 +930,3 @@ nfsd4_record_grace_done(struct nfsd_net *nn, time_t boot_time)
> >  		nn->client_tracking_ops->grace_done(nn, boot_time);
> >  }
> >
> >-static int
> >-rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr)
> >-{
> >-	struct super_block *sb = ptr;
> >-	struct net *net = sb->s_fs_info;
> >-	struct nfsd_net *nn = net_generic(net, nfsd_net_id);
> >-	struct cld_net *cn = nn->cld_net;
> >-	struct dentry *dentry;
> >-	int ret = 0;
> >-
> >-	if (!try_module_get(THIS_MODULE))
> >-		return 0;
> >-
> >-	if (!cn) {
> >-		module_put(THIS_MODULE);
> >-		return 0;
> >-	}
> >-
> >-	switch (event) {
> >-	case RPC_PIPEFS_MOUNT:
> >-		dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe);
> >-		if (IS_ERR(dentry)) {
> >-			ret = PTR_ERR(dentry);
> >-			break;
> >-		}
> >-		cn->cn_pipe->dentry = dentry;
> >-		break;
> >-	case RPC_PIPEFS_UMOUNT:
> >-		if (cn->cn_pipe->dentry)
> >-			nfsd4_cld_unregister_sb(cn->cn_pipe);
> >-		break;
> >-	default:
> >-		ret = -ENOTSUPP;
> >-		break;
> >-	}
> >-	module_put(THIS_MODULE);
> >-	return ret;
> >-}
> >-
> >-static struct notifier_block nfsd4_cld_block = {
> >-	.notifier_call = rpc_pipefs_event,
> >-};
> >-
> >-int
> >-register_cld_notifier(void)
> >-{
> >-	return rpc_pipefs_notifier_register(&nfsd4_cld_block);
> >-}
> >-
> >-void
> >-unregister_cld_notifier(void)
> >-{
> >-	rpc_pipefs_notifier_unregister(&nfsd4_cld_block);
> >-}
> >diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
> >index a830f33..f0aeb93 100644
> >--- a/fs/nfsd/nfsctl.c
> >+++ b/fs/nfsd/nfsctl.c
> >@@ -1163,12 +1163,9 @@ static int __init init_nfsd(void)
> >  	int retval;
> >  	printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx).\n");
> >
> >-	retval = register_cld_notifier();
> >-	if (retval)
> >-		return retval;
> >  	retval = register_pernet_subsys(&nfsd_net_ops);
> >  	if (retval < 0)
> >-		goto out_unregister_notifier;
> >+		return retval;
> >  	retval = nfsd4_init_slabs();
> >  	if (retval)
> >  		goto out_unregister_pernet;
> >@@ -1201,8 +1198,6 @@ out_free_slabs:
> >  	nfsd4_free_slabs();
> >  out_unregister_pernet:
> >  	unregister_pernet_subsys(&nfsd_net_ops);
> >-out_unregister_notifier:
> >-	unregister_cld_notifier();
> >  	return retval;
> >  }
> >
> >@@ -1217,7 +1212,6 @@ static void __exit exit_nfsd(void)
> >  	nfsd_fault_inject_cleanup();
> >  	unregister_filesystem(&nfsd_fs_type);
> >  	unregister_pernet_subsys(&nfsd_net_ops);
> >-	unregister_cld_notifier();
> >  }
> >
> >  MODULE_AUTHOR("Olaf Kirch <okir@xxxxxxxxxxxx>");
> >diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
> >index 07a473f..8eb2aac 100644
> >--- a/fs/nfsd/nfsd.h
> >+++ b/fs/nfsd/nfsd.h
> >@@ -365,17 +365,12 @@ static inline u32 nfsd_suppattrs2(u32 minorversion)
> >  	NFSD_WRITEABLE_ATTRS_WORD2
> >
> >  extern int nfsd4_is_junction(struct dentry *dentry);
> >-extern int register_cld_notifier(void);
> >-extern void unregister_cld_notifier(void);
> >  #else /* CONFIG_NFSD_V4 */
> >  static inline int nfsd4_is_junction(struct dentry *dentry)
> >  {
> >  	return 0;
> >  }
> >
> >-#define register_cld_notifier() 0
> >-#define unregister_cld_notifier() do { } while(0)
> >-
> >  #endif /* CONFIG_NFSD_V4 */
> >
> >  #endif /* LINUX_NFSD_NFSD_H */
> >diff --git a/include/uapi/linux/nfsd/Kbuild b/include/uapi/linux/nfsd/Kbuild
> >index c11bc40..88589ac 100644
> >--- a/include/uapi/linux/nfsd/Kbuild
> >+++ b/include/uapi/linux/nfsd/Kbuild
> >@@ -1,5 +1,4 @@
> >  # UAPI Header export list
> >-header-y += cld.h
> >  header-y += debug.h
> >  header-y += export.h
> >  header-y += nfsfh.h
> >diff --git a/include/uapi/linux/nfsd/cld.h b/include/uapi/linux/nfsd/cld.h
> >deleted file mode 100644
> >index f14a9ab..0000000
> >--- a/include/uapi/linux/nfsd/cld.h
> >+++ /dev/null
> >@@ -1,56 +0,0 @@
> >-/*
> >- * Upcall description for nfsdcld communication
> >- *
> >- * Copyright (c) 2012 Red Hat, Inc.
> >- * Author(s): Jeff Layton <jlayton@xxxxxxxxxx>
> >- *
> >- *  This program is free software; you can redistribute it and/or modify
> >- *  it under the terms of the GNU General Public License as published by
> >- *  the Free Software Foundation; either version 2 of the License, or
> >- *  (at your option) any later version.
> >- *
> >- *  This program is distributed in the hope that it will be useful,
> >- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
> >- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >- *  GNU General Public License for more details.
> >- *
> >- *  You should have received a copy of the GNU General Public License
> >- *  along with this program; if not, write to the Free Software
> >- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> >- */
> >-
> >-#ifndef _NFSD_CLD_H
> >-#define _NFSD_CLD_H
> >-
> >-/* latest upcall version available */
> >-#define CLD_UPCALL_VERSION 1
> >-
> >-/* defined by RFC3530 */
> >-#define NFS4_OPAQUE_LIMIT 1024
> >-
> >-enum cld_command {
> >-	Cld_Create,		/* create a record for this cm_id */
> >-	Cld_Remove,		/* remove record of this cm_id */
> >-	Cld_Check,		/* is this cm_id allowed? */
> >-	Cld_GraceDone,		/* grace period is complete */
> >-};
> >-
> >-/* representation of long-form NFSv4 client ID */
> >-struct cld_name {
> >-	uint16_t	cn_len;				/* length of cm_id */
> >-	unsigned char	cn_id[NFS4_OPAQUE_LIMIT];	/* client-provided */
> >-} __attribute__((packed));
> >-
> >-/* message struct for communication with userspace */
> >-struct cld_msg {
> >-	uint8_t		cm_vers;		/* upcall version */
> >-	uint8_t		cm_cmd;			/* upcall command */
> >-	int16_t		cm_status;		/* return code */
> >-	uint32_t	cm_xid;			/* transaction id */
> >-	union {
> >-		int64_t		cm_gracetime;	/* grace period start time */
> >-		struct cld_name	cm_name;
> >-	} __attribute__((packed)) cm_u;
> >-} __attribute__((packed));
> >-
> >-#endif /* !_NFSD_CLD_H */
> >
> 
> 
> -- 
> Best regards,
> Stanislav Kinsbursky
> --
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