2 * linux/include/linux/lockd/lockd.h
4 * General-purpose lockd include file.
6 * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de>
9 #ifndef LINUX_LOCKD_LOCKD_H
10 #define LINUX_LOCKD_LOCKD_H
15 #include <linux/in6.h>
18 #include <linux/kref.h>
19 #include <linux/utsname.h>
20 #include <linux/lockd/bind.h>
21 #include <linux/lockd/xdr.h>
22 #ifdef CONFIG_LOCKD_V4
23 #include <linux/lockd/xdr4.h>
25 #include <linux/lockd/debug.h>
26 #include <linux/sunrpc/svc.h>
31 #define LOCKD_VERSION "0.5"
34 * Default timeout for RPC calls (seconds)
36 #define LOCKD_DFLT_TIMEO 10
39 * Lockd host handle (used both by the client and server personality).
42 struct hlist_node h_hash; /* doubly linked list */
43 struct sockaddr_storage h_addr; /* peer address */
45 struct sockaddr_storage h_srcaddr; /* our address (optional) */
47 struct rpc_clnt *h_rpcclnt; /* RPC client to talk to peer */
48 char *h_name; /* remote hostname */
49 u32 h_version; /* interface version */
50 unsigned short h_proto; /* transport proto */
51 unsigned short h_reclaiming : 1,
52 h_server : 1, /* server side, not client side */
55 wait_queue_head_t h_gracewait; /* wait while reclaiming */
56 struct rw_semaphore h_rwsem; /* Reboot recovery lock */
57 u32 h_state; /* pseudo-state counter */
58 u32 h_nsmstate; /* true remote NSM state */
59 u32 h_pidcount; /* Pseudopids */
60 atomic_t h_count; /* reference count */
61 struct mutex h_mutex; /* mutex for pmap binding */
62 unsigned long h_nextrebind; /* next portmap call */
63 unsigned long h_expires; /* eligible for GC */
64 struct list_head h_lockowners; /* Lockowners for the client */
66 struct list_head h_granted; /* Locks in GRANTED state */
67 struct list_head h_reclaim; /* Locks in RECLAIM state */
68 struct nsm_handle *h_nsmhandle; /* NSM status handle */
69 char *h_addrbuf; /* address eyecatcher */
70 struct net *net; /* host net */
71 char nodename[UNX_MAXNODENAME + 1];
72 const struct nlmclnt_operations *h_nlmclnt_ops; /* Callback ops for NLM users */
76 * The largest string sm_addrbuf should hold is a full-size IPv6 address
77 * (no "::" anywhere) with a scope ID. The buffer size is computed to
78 * hold eight groups of colon-separated four-hex-digit numbers, a
79 * percent sign, a scope id (at most 32 bits, in decimal), and NUL.
81 #define NSM_ADDRBUF ((8 * 4 + 7) + (1 + 10) + 1)
84 struct list_head sm_link;
88 struct sockaddr_storage sm_addr;
90 unsigned int sm_monitored : 1,
91 sm_sticky : 1; /* don't unmonitor */
92 struct nsm_private sm_priv;
93 char sm_addrbuf[NSM_ADDRBUF];
97 * Rigorous type checking on sockaddr type conversions
99 static inline struct sockaddr_in *nlm_addr_in(const struct nlm_host *host)
101 return (struct sockaddr_in *)&host->h_addr;
104 static inline struct sockaddr *nlm_addr(const struct nlm_host *host)
106 return (struct sockaddr *)&host->h_addr;
109 static inline struct sockaddr_in *nlm_srcaddr_in(const struct nlm_host *host)
111 return (struct sockaddr_in *)&host->h_srcaddr;
114 static inline struct sockaddr *nlm_srcaddr(const struct nlm_host *host)
116 return (struct sockaddr *)&host->h_srcaddr;
120 * Map an fl_owner_t into a unique 32-bit "pid"
122 struct nlm_lockowner {
123 struct list_head list;
126 struct nlm_host *host;
134 * Memory chunk for NLM client RPC request.
136 #define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
139 unsigned int a_flags; /* initial RPC task flags */
140 struct nlm_host * a_host; /* host handle */
141 struct nlm_args a_args; /* arguments */
142 struct nlm_res a_res; /* result */
143 struct nlm_block * a_block;
144 unsigned int a_retries; /* Retry count */
145 u8 a_owner[NLMCLNT_OHSIZE];
146 void * a_callback_data; /* sent to nlmclnt_operations callbacks */
150 * This struct describes a file held open by lockd on behalf of
154 struct hlist_node f_list; /* linked list */
155 struct nfs_fh f_handle; /* NFS file handle */
156 struct file * f_file; /* VFS file pointer */
157 struct nlm_share * f_shares; /* DOS shares */
158 struct list_head f_blocks; /* blocked locks */
159 unsigned int f_locks; /* guesstimate # of locks */
160 unsigned int f_count; /* reference count */
161 struct mutex f_mutex; /* avoid concurrent access */
165 * This is a server block (i.e. a lock requested by some client which
166 * couldn't be granted because of a conflicting lock).
168 #define NLM_NEVER (~(unsigned long) 0)
169 /* timeout on non-blocking call: */
170 #define NLM_TIMEOUT (7 * HZ)
173 struct kref b_count; /* Reference count */
174 struct list_head b_list; /* linked list of all blocks */
175 struct list_head b_flist; /* linked list (per file) */
176 struct nlm_rqst * b_call; /* RPC args & callback info */
177 struct svc_serv * b_daemon; /* NLM service */
178 struct nlm_host * b_host; /* host handle for RPC clnt */
179 unsigned long b_when; /* next re-xmit */
180 unsigned int b_id; /* block id */
181 unsigned char b_granted; /* VFS granted lock */
182 struct nlm_file * b_file; /* file in question */
183 struct cache_req * b_cache_req; /* deferred request handling */
184 struct cache_deferred_req * b_deferred_req;
185 unsigned int b_flags; /* block flags */
186 #define B_QUEUED 1 /* lock queued */
187 #define B_GOT_CALLBACK 2 /* got lock or conflicting lock */
188 #define B_TIMED_OUT 4 /* filesystem too slow to respond */
194 extern const struct rpc_program nlm_program;
195 extern const struct svc_procedure nlmsvc_procedures[];
196 #ifdef CONFIG_LOCKD_V4
197 extern const struct svc_procedure nlmsvc_procedures4[];
199 extern int nlmsvc_grace_period;
200 extern unsigned long nlmsvc_timeout;
201 extern bool nsm_use_hostnames;
202 extern u32 nsm_local_state;
205 * Lockd client functions
207 struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
208 int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *);
209 int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *);
210 void nlmclnt_release_call(struct nlm_rqst *);
211 struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
212 void nlmclnt_finish_block(struct nlm_wait *block);
213 int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
214 __be32 nlmclnt_grant(const struct sockaddr *addr,
215 const struct nlm_lock *lock);
216 void nlmclnt_recovery(struct nlm_host *);
217 int nlmclnt_reclaim(struct nlm_host *, struct file_lock *,
219 void nlmclnt_next_cookie(struct nlm_cookie *);
224 struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
226 const unsigned short protocol,
228 const char *hostname,
231 void nlmclnt_release_host(struct nlm_host *);
232 struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
233 const char *hostname,
234 const size_t hostname_len);
235 void nlmsvc_release_host(struct nlm_host *);
236 struct rpc_clnt * nlm_bind_host(struct nlm_host *);
237 void nlm_rebind_host(struct nlm_host *);
238 struct nlm_host * nlm_get_host(struct nlm_host *);
239 void nlm_shutdown_hosts(void);
240 void nlm_shutdown_hosts_net(struct net *net);
241 void nlm_host_rebooted(const struct net *net,
242 const struct nlm_reboot *);
247 int nsm_monitor(const struct nlm_host *host);
248 void nsm_unmonitor(const struct nlm_host *host);
250 struct nsm_handle *nsm_get_handle(const struct net *net,
251 const struct sockaddr *sap,
253 const char *hostname,
254 const size_t hostname_len);
255 struct nsm_handle *nsm_reboot_lookup(const struct net *net,
256 const struct nlm_reboot *info);
257 void nsm_release(struct nsm_handle *nsm);
260 * This is used in garbage collection and resource reclaim
261 * A return value != 0 means destroy the lock/block/share
263 typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
266 * Server-side lock handling
268 __be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
269 struct nlm_host *, struct nlm_lock *, int,
270 struct nlm_cookie *, int);
271 __be32 nlmsvc_unlock(struct net *net, struct nlm_file *, struct nlm_lock *);
272 __be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
273 struct nlm_host *, struct nlm_lock *,
274 struct nlm_lock *, struct nlm_cookie *);
275 __be32 nlmsvc_cancel_blocked(struct net *net, struct nlm_file *, struct nlm_lock *);
276 unsigned long nlmsvc_retry_blocked(void);
277 void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
278 nlm_host_match_fn_t match);
279 void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
280 void nlmsvc_release_call(struct nlm_rqst *);
283 * File handling for the server personality
285 __be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
287 void nlm_release_file(struct nlm_file *);
288 void nlmsvc_mark_resources(struct net *);
289 void nlmsvc_free_host_resources(struct nlm_host *);
290 void nlmsvc_invalidate_all(void);
293 * Cluster failover support
295 int nlmsvc_unlock_all_by_sb(struct super_block *sb);
296 int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
298 static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
300 return file_inode(file->f_file);
303 static inline int __nlm_privileged_request4(const struct sockaddr *sap)
305 const struct sockaddr_in *sin = (struct sockaddr_in *)sap;
307 if (ntohs(sin->sin_port) > 1023)
310 return ipv4_is_loopback(sin->sin_addr.s_addr);
313 #if IS_ENABLED(CONFIG_IPV6)
314 static inline int __nlm_privileged_request6(const struct sockaddr *sap)
316 const struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
318 if (ntohs(sin6->sin6_port) > 1023)
321 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
322 return ipv4_is_loopback(sin6->sin6_addr.s6_addr32[3]);
324 return ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LOOPBACK;
326 #else /* IS_ENABLED(CONFIG_IPV6) */
327 static inline int __nlm_privileged_request6(const struct sockaddr *sap)
331 #endif /* IS_ENABLED(CONFIG_IPV6) */
334 * Ensure incoming requests are from local privileged callers.
336 * Return TRUE if sender is local and is connecting via a privileged port;
337 * otherwise return FALSE.
339 static inline int nlm_privileged_requester(const struct svc_rqst *rqstp)
341 const struct sockaddr *sap = svc_addr(rqstp);
343 switch (sap->sa_family) {
345 return __nlm_privileged_request4(sap);
347 return __nlm_privileged_request6(sap);
354 * Compare two NLM locks.
355 * When the second lock is of type F_UNLCK, this acts like a wildcard.
357 static inline int nlm_compare_locks(const struct file_lock *fl1,
358 const struct file_lock *fl2)
360 return file_inode(fl1->fl_file) == file_inode(fl2->fl_file)
361 && fl1->fl_pid == fl2->fl_pid
362 && fl1->fl_owner == fl2->fl_owner
363 && fl1->fl_start == fl2->fl_start
364 && fl1->fl_end == fl2->fl_end
365 &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK);
368 extern const struct lock_manager_operations nlmsvc_lock_operations;
370 #endif /* __KERNEL__ */
372 #endif /* LINUX_LOCKD_LOCKD_H */