v4.19.13 snapshot.
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h
new file mode 100644
index 0000000..b065ef4
--- /dev/null
+++ b/include/linux/lockd/lockd.h
@@ -0,0 +1,374 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/include/linux/lockd/lockd.h
+ *
+ * General-purpose lockd include file.
+ *
+ * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef LINUX_LOCKD_LOCKD_H
+#define LINUX_LOCKD_LOCKD_H
+
+#ifdef __KERNEL__
+
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <net/ipv6.h>
+#include <linux/fs.h>
+#include <linux/kref.h>
+#include <linux/refcount.h>
+#include <linux/utsname.h>
+#include <linux/lockd/bind.h>
+#include <linux/lockd/xdr.h>
+#ifdef CONFIG_LOCKD_V4
+#include <linux/lockd/xdr4.h>
+#endif
+#include <linux/lockd/debug.h>
+#include <linux/sunrpc/svc.h>
+
+/*
+ * Version string
+ */
+#define LOCKD_VERSION "0.5"
+
+/*
+ * Default timeout for RPC calls (seconds)
+ */
+#define LOCKD_DFLT_TIMEO 10
+
+/*
+ * Lockd host handle (used both by the client and server personality).
+ */
+struct nlm_host {
+ struct hlist_node h_hash; /* doubly linked list */
+ struct sockaddr_storage h_addr; /* peer address */
+ size_t h_addrlen;
+ struct sockaddr_storage h_srcaddr; /* our address (optional) */
+ size_t h_srcaddrlen;
+ struct rpc_clnt *h_rpcclnt; /* RPC client to talk to peer */
+ char *h_name; /* remote hostname */
+ u32 h_version; /* interface version */
+ unsigned short h_proto; /* transport proto */
+ unsigned short h_reclaiming : 1,
+ h_server : 1, /* server side, not client side */
+ h_noresvport : 1,
+ h_inuse : 1;
+ wait_queue_head_t h_gracewait; /* wait while reclaiming */
+ struct rw_semaphore h_rwsem; /* Reboot recovery lock */
+ u32 h_state; /* pseudo-state counter */
+ u32 h_nsmstate; /* true remote NSM state */
+ u32 h_pidcount; /* Pseudopids */
+ refcount_t h_count; /* reference count */
+ struct mutex h_mutex; /* mutex for pmap binding */
+ unsigned long h_nextrebind; /* next portmap call */
+ unsigned long h_expires; /* eligible for GC */
+ struct list_head h_lockowners; /* Lockowners for the client */
+ spinlock_t h_lock;
+ struct list_head h_granted; /* Locks in GRANTED state */
+ struct list_head h_reclaim; /* Locks in RECLAIM state */
+ struct nsm_handle *h_nsmhandle; /* NSM status handle */
+ char *h_addrbuf; /* address eyecatcher */
+ struct net *net; /* host net */
+ char nodename[UNX_MAXNODENAME + 1];
+ const struct nlmclnt_operations *h_nlmclnt_ops; /* Callback ops for NLM users */
+};
+
+/*
+ * The largest string sm_addrbuf should hold is a full-size IPv6 address
+ * (no "::" anywhere) with a scope ID. The buffer size is computed to
+ * hold eight groups of colon-separated four-hex-digit numbers, a
+ * percent sign, a scope id (at most 32 bits, in decimal), and NUL.
+ */
+#define NSM_ADDRBUF ((8 * 4 + 7) + (1 + 10) + 1)
+
+struct nsm_handle {
+ struct list_head sm_link;
+ refcount_t sm_count;
+ char *sm_mon_name;
+ char *sm_name;
+ struct sockaddr_storage sm_addr;
+ size_t sm_addrlen;
+ unsigned int sm_monitored : 1,
+ sm_sticky : 1; /* don't unmonitor */
+ struct nsm_private sm_priv;
+ char sm_addrbuf[NSM_ADDRBUF];
+};
+
+/*
+ * Rigorous type checking on sockaddr type conversions
+ */
+static inline struct sockaddr_in *nlm_addr_in(const struct nlm_host *host)
+{
+ return (struct sockaddr_in *)&host->h_addr;
+}
+
+static inline struct sockaddr *nlm_addr(const struct nlm_host *host)
+{
+ return (struct sockaddr *)&host->h_addr;
+}
+
+static inline struct sockaddr_in *nlm_srcaddr_in(const struct nlm_host *host)
+{
+ return (struct sockaddr_in *)&host->h_srcaddr;
+}
+
+static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
+{
+ return (struct sockaddr *)&host->h_srcaddr;
+}
+
+/*
+ * Map an fl_owner_t into a unique 32-bit "pid"
+ */
+struct nlm_lockowner {
+ struct list_head list;
+ refcount_t count;
+
+ struct nlm_host *host;
+ fl_owner_t owner;
+ uint32_t pid;
+};
+
+struct nlm_wait;
+
+/*
+ * Memory chunk for NLM client RPC request.
+ */
+#define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
+struct nlm_rqst {
+ refcount_t a_count;
+ unsigned int a_flags; /* initial RPC task flags */
+ struct nlm_host * a_host; /* host handle */
+ struct nlm_args a_args; /* arguments */
+ struct nlm_res a_res; /* result */
+ struct nlm_block * a_block;
+ unsigned int a_retries; /* Retry count */
+ u8 a_owner[NLMCLNT_OHSIZE];
+ void * a_callback_data; /* sent to nlmclnt_operations callbacks */
+};
+
+/*
+ * This struct describes a file held open by lockd on behalf of
+ * an NFS client.
+ */
+struct nlm_file {
+ struct hlist_node f_list; /* linked list */
+ struct nfs_fh f_handle; /* NFS file handle */
+ struct file * f_file; /* VFS file pointer */
+ struct nlm_share * f_shares; /* DOS shares */
+ struct list_head f_blocks; /* blocked locks */
+ unsigned int f_locks; /* guesstimate # of locks */
+ unsigned int f_count; /* reference count */
+ struct mutex f_mutex; /* avoid concurrent access */
+};
+
+/*
+ * This is a server block (i.e. a lock requested by some client which
+ * couldn't be granted because of a conflicting lock).
+ */
+#define NLM_NEVER (~(unsigned long) 0)
+/* timeout on non-blocking call: */
+#define NLM_TIMEOUT (7 * HZ)
+
+struct nlm_block {
+ struct kref b_count; /* Reference count */
+ struct list_head b_list; /* linked list of all blocks */
+ struct list_head b_flist; /* linked list (per file) */
+ struct nlm_rqst * b_call; /* RPC args & callback info */
+ struct svc_serv * b_daemon; /* NLM service */
+ struct nlm_host * b_host; /* host handle for RPC clnt */
+ unsigned long b_when; /* next re-xmit */
+ unsigned int b_id; /* block id */
+ unsigned char b_granted; /* VFS granted lock */
+ struct nlm_file * b_file; /* file in question */
+ struct cache_req * b_cache_req; /* deferred request handling */
+ struct cache_deferred_req * b_deferred_req;
+ unsigned int b_flags; /* block flags */
+#define B_QUEUED 1 /* lock queued */
+#define B_GOT_CALLBACK 2 /* got lock or conflicting lock */
+#define B_TIMED_OUT 4 /* filesystem too slow to respond */
+};
+
+/*
+ * Global variables
+ */
+extern const struct rpc_program nlm_program;
+extern const struct svc_procedure nlmsvc_procedures[];
+#ifdef CONFIG_LOCKD_V4
+extern const struct svc_procedure nlmsvc_procedures4[];
+#endif
+extern int nlmsvc_grace_period;
+extern unsigned long nlmsvc_timeout;
+extern bool nsm_use_hostnames;
+extern u32 nsm_local_state;
+
+/*
+ * Lockd client functions
+ */
+struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
+int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *);
+int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *);
+void nlmclnt_release_call(struct nlm_rqst *);
+struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
+void nlmclnt_finish_block(struct nlm_wait *block);
+int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
+__be32 nlmclnt_grant(const struct sockaddr *addr,
+ const struct nlm_lock *lock);
+void nlmclnt_recovery(struct nlm_host *);
+int nlmclnt_reclaim(struct nlm_host *, struct file_lock *,
+ struct nlm_rqst *);
+void nlmclnt_next_cookie(struct nlm_cookie *);
+
+/*
+ * Host cache
+ */
+struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
+ const size_t salen,
+ const unsigned short protocol,
+ const u32 version,
+ const char *hostname,
+ int noresvport,
+ struct net *net);
+void nlmclnt_release_host(struct nlm_host *);
+struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
+ const char *hostname,
+ const size_t hostname_len);
+void nlmsvc_release_host(struct nlm_host *);
+struct rpc_clnt * nlm_bind_host(struct nlm_host *);
+void nlm_rebind_host(struct nlm_host *);
+struct nlm_host * nlm_get_host(struct nlm_host *);
+void nlm_shutdown_hosts(void);
+void nlm_shutdown_hosts_net(struct net *net);
+void nlm_host_rebooted(const struct net *net,
+ const struct nlm_reboot *);
+
+/*
+ * Host monitoring
+ */
+int nsm_monitor(const struct nlm_host *host);
+void nsm_unmonitor(const struct nlm_host *host);
+
+struct nsm_handle *nsm_get_handle(const struct net *net,
+ const struct sockaddr *sap,
+ const size_t salen,
+ const char *hostname,
+ const size_t hostname_len);
+struct nsm_handle *nsm_reboot_lookup(const struct net *net,
+ const struct nlm_reboot *info);
+void nsm_release(struct nsm_handle *nsm);
+
+/*
+ * This is used in garbage collection and resource reclaim
+ * A return value != 0 means destroy the lock/block/share
+ */
+typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
+
+/*
+ * Server-side lock handling
+ */
+__be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
+ struct nlm_host *, struct nlm_lock *, int,
+ struct nlm_cookie *, int);
+__be32 nlmsvc_unlock(struct net *net, struct nlm_file *, struct nlm_lock *);
+__be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
+ struct nlm_host *, struct nlm_lock *,
+ struct nlm_lock *, struct nlm_cookie *);
+__be32 nlmsvc_cancel_blocked(struct net *net, struct nlm_file *, struct nlm_lock *);
+unsigned long nlmsvc_retry_blocked(void);
+void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
+ nlm_host_match_fn_t match);
+void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
+void nlmsvc_release_call(struct nlm_rqst *);
+
+/*
+ * File handling for the server personality
+ */
+__be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
+ struct nfs_fh *);
+void nlm_release_file(struct nlm_file *);
+void nlmsvc_mark_resources(struct net *);
+void nlmsvc_free_host_resources(struct nlm_host *);
+void nlmsvc_invalidate_all(void);
+
+/*
+ * Cluster failover support
+ */
+int nlmsvc_unlock_all_by_sb(struct super_block *sb);
+int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
+
+static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
+{
+ return locks_inode(file->f_file);
+}
+
+static inline int __nlm_privileged_request4(const struct sockaddr *sap)
+{
+ const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
+
+ if (ntohs(sin->sin_port) > 1023)
+ return 0;
+
+ return ipv4_is_loopback(sin->sin_addr.s_addr);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline int __nlm_privileged_request6(const struct sockaddr *sap)
+{
+ const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
+
+ if (ntohs(sin6->sin6_port) > 1023)
+ return 0;
+
+ if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
+ return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]);
+
+ return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK;
+}
+#else /* IS_ENABLED(CONFIG_IPV6) */
+static inline int __nlm_privileged_request6(const struct sockaddr *sap)
+{
+ return 0;
+}
+#endif /* IS_ENABLED(CONFIG_IPV6) */
+
+/*
+ * Ensure incoming requests are from local privileged callers.
+ *
+ * Return TRUE if sender is local and is connecting via a privileged port;
+ * otherwise return FALSE.
+ */
+static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
+{
+ const struct sockaddr *sap = svc_addr(rqstp);
+
+ switch (sap->sa_family) {
+ case AF_INET:
+ return __nlm_privileged_request4(sap);
+ case AF_INET6:
+ return __nlm_privileged_request6(sap);
+ default:
+ return 0;
+ }
+}
+
+/*
+ * Compare two NLM locks.
+ * When the second lock is of type F_UNLCK, this acts like a wildcard.
+ */
+static inline int nlm_compare_locks(const struct file_lock *fl1,
+ const struct file_lock *fl2)
+{
+ return locks_inode(fl1->fl_file) == locks_inode(fl2->fl_file)
+ && fl1->fl_pid == fl2->fl_pid
+ && fl1->fl_owner == fl2->fl_owner
+ && fl1->fl_start == fl2->fl_start
+ && fl1->fl_end == fl2->fl_end
+ &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK);
+}
+
+extern const struct lock_manager_operations nlmsvc_lock_operations;
+
+#endif /* __KERNEL__ */
+
+#endif /* LINUX_LOCKD_LOCKD_H */