Merge tag 'nfs-for-6.5-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
"Stable fixes and other bugfixes:

   - nfs: don't report STATX_BTIME in ->getattr

   - Revert 'NFSv4: Retry LOCK on OLD_STATEID during delegation return'
     since it breaks NFSv4 state recovery.

   - NFSv4.1: freeze the session table upon receiving NFS4ERR_BADSESSION

   - Fix the NFSv4.2 xattr cache shrinker_id

   - Force a ctime update after a NFSv4.2 SETXATTR call

  Features and cleanups:

   - NFS and RPC over TLS client code from Chuck Lever

   - Support for use of abstract unix socket addresses with the rpcbind
     daemon

   - Sysfs API to allow shutdown of the kernel RPC client and prevent
     umount() hangs if the server is known to be permanently down

   - XDR cleanups from Anna"

* tag 'nfs-for-6.5-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (33 commits)
  Revert "NFSv4: Retry LOCK on OLD_STATEID during delegation return"
  NFS: Don't cleanup sysfs superblock entry if uninitialized
  nfs: don't report STATX_BTIME in ->getattr
  NFSv4.1: freeze the session table upon receiving NFS4ERR_BADSESSION
  NFSv4.2: fix wrong shrinker_id
  NFSv4: Clean up some shutdown loops
  NFS: Cancel all existing RPC tasks when shutdown
  NFS: add sysfs shutdown knob
  NFS: add a sysfs link to the acl rpc_client
  NFS: add a sysfs link to the lockd rpc_client
  NFS: Add sysfs links to sunrpc clients for nfs_clients
  NFS: add superblock sysfs entries
  NFS: Make all of /sys/fs/nfs network-namespace unique
  NFS: Open-code the nfs_kset kset_create_and_add()
  NFS: rename nfs_client_kobj to nfs_net_kobj
  NFS: rename nfs_client_kset to nfs_kset
  NFS: Add an "xprtsec=" NFS mount option
  NFS: Have struct nfs_client carry a TLS policy field
  SUNRPC: Add a TCP-with-TLS RPC transport class
  SUNRPC: Capture CMSG metadata on client-side receive
  ...

1 files changed, 201 insertions, 34 deletions

diff --git a/fs/nfs/sysfs.c b/fs/nfs/sysfs.c
index 0cbcd2dfa732..acda8f033d30 100644
--- a/fs/nfs/sysfs.c
+++ b/fs/nfs/sysfs.c
@@ -12,17 +12,18 @@
 #include <linux/string.h>
 #include <linux/nfs_fs.h>
 #include <linux/rcupdate.h>
+#include <linux/lockd/lockd.h>
 
 #include "nfs4_fs.h"
 #include "netns.h"
 #include "sysfs.h"
 
-struct kobject *nfs_client_kobj;
-static struct kset *nfs_client_kset;
+static struct kset *nfs_kset;
 
-static void nfs_netns_object_release(struct kobject *kobj)
+static void nfs_kset_release(struct kobject *kobj)
 {
-	kfree(kobj);
+	struct kset *kset = container_of(kobj, struct kset, kobj);
+	kfree(kset);
 }
 
 static const struct kobj_ns_type_operations *nfs_netns_object_child_ns_type(
@@ -31,46 +32,42 @@ static const struct kobj_ns_type_operations *nfs_netns_object_child_ns_type(
 	return &net_ns_type_operations;
 }
 
-static struct kobj_type nfs_netns_object_type = {
-	.release = nfs_netns_object_release,
+static struct kobj_type nfs_kset_type = {
+	.release = nfs_kset_release,
 	.sysfs_ops = &kobj_sysfs_ops,
 	.child_ns_type = nfs_netns_object_child_ns_type,
 };
 
-static struct kobject *nfs_netns_object_alloc(const char *name,
-		struct kset *kset, struct kobject *parent)
+int nfs_sysfs_init(void)
 {
-	struct kobject *kobj;
+	int ret;
+
+	nfs_kset = kzalloc(sizeof(*nfs_kset), GFP_KERNEL);
+	if (!nfs_kset)
+		return -ENOMEM;
 
-	kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
-	if (kobj) {
-		kobj->kset = kset;
-		if (kobject_init_and_add(kobj, &nfs_netns_object_type,
-					parent, "%s", name) == 0)
-			return kobj;
-		kobject_put(kobj);
+	ret = kobject_set_name(&nfs_kset->kobj, "nfs");
+	if (ret) {
+		kfree(nfs_kset);
+		return ret;
 	}
-	return NULL;
-}
 
-int nfs_sysfs_init(void)
-{
-	nfs_client_kset = kset_create_and_add("nfs", NULL, fs_kobj);
-	if (!nfs_client_kset)
-		return -ENOMEM;
-	nfs_client_kobj = nfs_netns_object_alloc("net", nfs_client_kset, NULL);
-	if  (!nfs_client_kobj) {
-		kset_unregister(nfs_client_kset);
-		nfs_client_kset = NULL;
-		return -ENOMEM;
+	nfs_kset->kobj.parent = fs_kobj;
+	nfs_kset->kobj.ktype = &nfs_kset_type;
+	nfs_kset->kobj.kset = NULL;
+
+	ret = kset_register(nfs_kset);
+	if (ret) {
+		kfree(nfs_kset);
+		return ret;
 	}
+
 	return 0;
 }
 
 void nfs_sysfs_exit(void)
 {
-	kobject_put(nfs_client_kobj);
-	kset_unregister(nfs_client_kset);
+	kset_unregister(nfs_kset);
 }
 
 static ssize_t nfs_netns_identifier_show(struct kobject *kobj,
@@ -127,7 +124,6 @@ static void nfs_netns_client_release(struct kobject *kobj)
 			kobject);
 
 	kfree(rcu_dereference_raw(c->identifier));
-	kfree(c);
 }
 
 static const void *nfs_netns_client_namespace(const struct kobject *kobj)
@@ -151,6 +147,25 @@ static struct kobj_type nfs_netns_client_type = {
 	.namespace = nfs_netns_client_namespace,
 };
 
+static void nfs_netns_object_release(struct kobject *kobj)
+{
+	struct nfs_netns_client *c = container_of(kobj,
+			struct nfs_netns_client,
+			nfs_net_kobj);
+	kfree(c);
+}
+
+static const void *nfs_netns_namespace(const struct kobject *kobj)
+{
+	return container_of(kobj, struct nfs_netns_client, nfs_net_kobj)->net;
+}
+
+static struct kobj_type nfs_netns_object_type = {
+	.release = nfs_netns_object_release,
+	.sysfs_ops = &kobj_sysfs_ops,
+	.namespace =  nfs_netns_namespace,
+};
+
 static struct nfs_netns_client *nfs_netns_client_alloc(struct kobject *parent,
 		struct net *net)
 {
@@ -159,10 +174,19 @@ static struct nfs_netns_client *nfs_netns_client_alloc(struct kobject *parent,
 	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (p) {
 		p->net = net;
-		p->kobject.kset = nfs_client_kset;
+		p->kobject.kset = nfs_kset;
+		p->nfs_net_kobj.kset = nfs_kset;
+
+		if (kobject_init_and_add(&p->nfs_net_kobj, &nfs_netns_object_type,
+					parent, "net") != 0) {
+			kobject_put(&p->nfs_net_kobj);
+			return NULL;
+		}
+
 		if (kobject_init_and_add(&p->kobject, &nfs_netns_client_type,
-					parent, "nfs_client") == 0)
+					&p->nfs_net_kobj, "nfs_client") == 0)
 			return p;
+
 		kobject_put(&p->kobject);
 	}
 	return NULL;
@@ -172,7 +196,7 @@ void nfs_netns_sysfs_setup(struct nfs_net *netns, struct net *net)
 {
 	struct nfs_netns_client *clp;
 
-	clp = nfs_netns_client_alloc(nfs_client_kobj, net);
+	clp = nfs_netns_client_alloc(&nfs_kset->kobj, net);
 	if (clp) {
 		netns->nfs_client = clp;
 		kobject_uevent(&clp->kobject, KOBJ_ADD);
@@ -187,6 +211,149 @@ void nfs_netns_sysfs_destroy(struct nfs_net *netns)
 		kobject_uevent(&clp->kobject, KOBJ_REMOVE);
 		kobject_del(&clp->kobject);
 		kobject_put(&clp->kobject);
+		kobject_del(&clp->nfs_net_kobj);
+		kobject_put(&clp->nfs_net_kobj);
 		netns->nfs_client = NULL;
 	}
 }
+
+static bool shutdown_match_client(const struct rpc_task *task, const void *data)
+{
+	return true;
+}
+
+static void shutdown_client(struct rpc_clnt *clnt)
+{
+	clnt->cl_shutdown = 1;
+	rpc_cancel_tasks(clnt, -EIO, shutdown_match_client, NULL);
+}
+
+static ssize_t
+shutdown_show(struct kobject *kobj, struct kobj_attribute *attr,
+				char *buf)
+{
+	struct nfs_server *server = container_of(kobj, struct nfs_server, kobj);
+	bool shutdown = server->flags & NFS_MOUNT_SHUTDOWN;
+	return sysfs_emit(buf, "%d\n", shutdown);
+}
+
+static ssize_t
+shutdown_store(struct kobject *kobj, struct kobj_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct nfs_server *server;
+	int ret, val;
+
+	server = container_of(kobj, struct nfs_server, kobj);
+
+	ret = kstrtoint(buf, 0, &val);
+	if (ret)
+		return ret;
+
+	if (val != 1)
+		return -EINVAL;
+
+	/* already shut down? */
+	if (server->flags & NFS_MOUNT_SHUTDOWN)
+		goto out;
+
+	server->flags |= NFS_MOUNT_SHUTDOWN;
+	shutdown_client(server->client);
+	shutdown_client(server->nfs_client->cl_rpcclient);
+
+	if (!IS_ERR(server->client_acl))
+		shutdown_client(server->client_acl);
+
+	if (server->nlm_host)
+		shutdown_client(server->nlm_host->h_rpcclnt);
+out:
+	return count;
+}
+
+static struct kobj_attribute nfs_sysfs_attr_shutdown = __ATTR_RW(shutdown);
+
+#define RPC_CLIENT_NAME_SIZE 64
+
+void nfs_sysfs_link_rpc_client(struct nfs_server *server,
+			struct rpc_clnt *clnt, const char *uniq)
+{
+	char name[RPC_CLIENT_NAME_SIZE];
+	int ret;
+
+	strcpy(name, clnt->cl_program->name);
+	strcat(name, uniq ? uniq : "");
+	strcat(name, "_client");
+
+	ret = sysfs_create_link_nowarn(&server->kobj,
+						&clnt->cl_sysfs->kobject, name);
+	if (ret < 0)
+		pr_warn("NFS: can't create link to %s in sysfs (%d)\n",
+			name, ret);
+}
+EXPORT_SYMBOL_GPL(nfs_sysfs_link_rpc_client);
+
+static void nfs_sysfs_sb_release(struct kobject *kobj)
+{
+	/* no-op: why? see lib/kobject.c kobject_cleanup() */
+}
+
+static const void *nfs_netns_server_namespace(const struct kobject *kobj)
+{
+	return container_of(kobj, struct nfs_server, kobj)->nfs_client->cl_net;
+}
+
+static struct kobj_type nfs_sb_ktype = {
+	.release = nfs_sysfs_sb_release,
+	.sysfs_ops = &kobj_sysfs_ops,
+	.namespace = nfs_netns_server_namespace,
+	.child_ns_type = nfs_netns_object_child_ns_type,
+};
+
+void nfs_sysfs_add_server(struct nfs_server *server)
+{
+	int ret;
+
+	ret = kobject_init_and_add(&server->kobj, &nfs_sb_ktype,
+				&nfs_kset->kobj, "server-%d", server->s_sysfs_id);
+	if (ret < 0) {
+		pr_warn("NFS: nfs sysfs add server-%d failed (%d)\n",
+					server->s_sysfs_id, ret);
+		return;
+	}
+	ret = sysfs_create_file_ns(&server->kobj, &nfs_sysfs_attr_shutdown.attr,
+				nfs_netns_server_namespace(&server->kobj));
+	if (ret < 0)
+		pr_warn("NFS: sysfs_create_file_ns for server-%d failed (%d)\n",
+			server->s_sysfs_id, ret);
+}
+EXPORT_SYMBOL_GPL(nfs_sysfs_add_server);
+
+void nfs_sysfs_move_server_to_sb(struct super_block *s)
+{
+	struct nfs_server *server = s->s_fs_info;
+	int ret;
+
+	ret = kobject_rename(&server->kobj, s->s_id);
+	if (ret < 0)
+		pr_warn("NFS: rename sysfs %s failed (%d)\n",
+					server->kobj.name, ret);
+}
+
+void nfs_sysfs_move_sb_to_server(struct nfs_server *server)
+{
+	const char *s;
+	int ret = -ENOMEM;
+
+	s = kasprintf(GFP_KERNEL, "server-%d", server->s_sysfs_id);
+	if (s)
+		ret = kobject_rename(&server->kobj, s);
+	if (ret < 0)
+		pr_warn("NFS: rename sysfs %s failed (%d)\n",
+					server->kobj.name, ret);
+}
+
+/* unlink, not dec-ref */
+void nfs_sysfs_remove_server(struct nfs_server *server)
+{
+	kobject_del(&server->kobj);
+}