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
16 #include <linux/kref.h>
17 #include <linux/utsname.h>
18 #include <linux/nfsd/nfsfh.h>
19 #include <linux/lockd/bind.h>
20 #include <linux/lockd/xdr.h>
21 #ifdef CONFIG_LOCKD_V4
22 #include <linux/lockd/xdr4.h>
24 #include <linux/lockd/debug.h>
29 #define LOCKD_VERSION "0.5"
32 * Default timeout for RPC calls (seconds)
34 #define LOCKD_DFLT_TIMEO 10
37 * Lockd host handle (used both by the client and server personality).
40 struct hlist_node h_hash; /* doubly linked list */
41 struct sockaddr_in h_addr; /* peer address */
42 struct sockaddr_in h_saddr; /* our address (optional) */
43 struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */
44 char * h_name; /* remote hostname */
45 u32 h_version; /* interface version */
46 unsigned short h_proto; /* transport proto */
47 unsigned short h_reclaiming : 1,
48 h_server : 1, /* server side, not client side */
50 wait_queue_head_t h_gracewait; /* wait while reclaiming */
51 struct rw_semaphore h_rwsem; /* Reboot recovery lock */
52 u32 h_state; /* pseudo-state counter */
53 u32 h_nsmstate; /* true remote NSM state */
54 u32 h_pidcount; /* Pseudopids */
55 atomic_t h_count; /* reference count */
56 struct mutex h_mutex; /* mutex for pmap binding */
57 unsigned long h_nextrebind; /* next portmap call */
58 unsigned long h_expires; /* eligible for GC */
59 struct list_head h_lockowners; /* Lockowners for the client */
61 struct list_head h_granted; /* Locks in GRANTED state */
62 struct list_head h_reclaim; /* Locks in RECLAIM state */
63 struct nsm_handle * h_nsmhandle; /* NSM status handle */
67 struct list_head sm_link;
70 struct sockaddr_in sm_addr;
71 unsigned int sm_monitored : 1,
72 sm_sticky : 1; /* don't unmonitor */
76 * Map an fl_owner_t into a unique 32-bit "pid"
78 struct nlm_lockowner {
79 struct list_head list;
82 struct nlm_host *host;
90 * Memory chunk for NLM client RPC request.
92 #define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u)
95 unsigned int a_flags; /* initial RPC task flags */
96 struct nlm_host * a_host; /* host handle */
97 struct nlm_args a_args; /* arguments */
98 struct nlm_res a_res; /* result */
99 struct nlm_block * a_block;
100 unsigned int a_retries; /* Retry count */
101 u8 a_owner[NLMCLNT_OHSIZE];
105 * This struct describes a file held open by lockd on behalf of
109 struct hlist_node f_list; /* linked list */
110 struct nfs_fh f_handle; /* NFS file handle */
111 struct file * f_file; /* VFS file pointer */
112 struct nlm_share * f_shares; /* DOS shares */
113 struct list_head f_blocks; /* blocked locks */
114 unsigned int f_locks; /* guesstimate # of locks */
115 unsigned int f_count; /* reference count */
116 struct mutex f_mutex; /* avoid concurrent access */
120 * This is a server block (i.e. a lock requested by some client which
121 * couldn't be granted because of a conflicting lock).
123 #define NLM_NEVER (~(unsigned long) 0)
124 /* timeout on non-blocking call: */
125 #define NLM_TIMEOUT (7 * HZ)
128 struct kref b_count; /* Reference count */
129 struct list_head b_list; /* linked list of all blocks */
130 struct list_head b_flist; /* linked list (per file) */
131 struct nlm_rqst * b_call; /* RPC args & callback info */
132 struct svc_serv * b_daemon; /* NLM service */
133 struct nlm_host * b_host; /* host handle for RPC clnt */
134 unsigned long b_when; /* next re-xmit */
135 unsigned int b_id; /* block id */
136 unsigned char b_granted; /* VFS granted lock */
137 struct nlm_file * b_file; /* file in question */
138 struct cache_req * b_cache_req; /* deferred request handling */
139 struct file_lock * b_fl; /* set for GETLK */
140 struct cache_deferred_req * b_deferred_req;
141 unsigned int b_flags; /* block flags */
142 #define B_QUEUED 1 /* lock queued */
143 #define B_GOT_CALLBACK 2 /* got lock or conflicting lock */
144 #define B_TIMED_OUT 4 /* filesystem too slow to respond */
150 extern struct rpc_program nlm_program;
151 extern struct svc_procedure nlmsvc_procedures[];
152 #ifdef CONFIG_LOCKD_V4
153 extern struct svc_procedure nlmsvc_procedures4[];
155 extern int nlmsvc_grace_period;
156 extern unsigned long nlmsvc_timeout;
157 extern int nsm_use_hostnames;
160 * Lockd client functions
162 struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
163 void nlm_release_call(struct nlm_rqst *);
164 int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *);
165 int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *);
166 struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
167 void nlmclnt_finish_block(struct nlm_wait *block);
168 int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
169 __be32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *);
170 void nlmclnt_recovery(struct nlm_host *);
171 int nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
172 void nlmclnt_next_cookie(struct nlm_cookie *);
177 struct nlm_host *nlmclnt_lookup_host(const struct sockaddr_in *sin,
178 int proto, u32 version,
179 const char *hostname,
180 unsigned int hostname_len);
181 struct nlm_host *nlmsvc_lookup_host(struct svc_rqst *, const char *,
183 struct rpc_clnt * nlm_bind_host(struct nlm_host *);
184 void nlm_rebind_host(struct nlm_host *);
185 struct nlm_host * nlm_get_host(struct nlm_host *);
186 void nlm_release_host(struct nlm_host *);
187 void nlm_shutdown_hosts(void);
188 extern void nlm_host_rebooted(const struct sockaddr_in *, const char *,
190 void nsm_release(struct nsm_handle *);
194 * This is used in garbage collection and resource reclaim
195 * A return value != 0 means destroy the lock/block/share
197 typedef int (*nlm_host_match_fn_t)(void *cur, struct nlm_host *ref);
200 * Server-side lock handling
202 __be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
203 struct nlm_host *, struct nlm_lock *, int,
204 struct nlm_cookie *);
205 __be32 nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
206 __be32 nlmsvc_testlock(struct svc_rqst *, struct nlm_file *,
207 struct nlm_host *, struct nlm_lock *,
208 struct nlm_lock *, struct nlm_cookie *);
209 __be32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *);
210 unsigned long nlmsvc_retry_blocked(void);
211 void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
212 nlm_host_match_fn_t match);
213 void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
216 * File handling for the server personality
218 __be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **,
220 void nlm_release_file(struct nlm_file *);
221 void nlmsvc_mark_resources(void);
222 void nlmsvc_free_host_resources(struct nlm_host *);
223 void nlmsvc_invalidate_all(void);
226 * Cluster failover support
228 int nlmsvc_unlock_all_by_sb(struct super_block *sb);
229 int nlmsvc_unlock_all_by_ip(struct sockaddr *server_addr);
231 static inline struct inode *nlmsvc_file_inode(struct nlm_file *file)
233 return file->f_file->f_path.dentry->d_inode;
237 * Compare two host addresses (needs modifying for ipv6)
239 static inline int nlm_cmp_addr(const struct sockaddr_in *sin1,
240 const struct sockaddr_in *sin2)
242 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr;
246 * Compare two NLM locks.
247 * When the second lock is of type F_UNLCK, this acts like a wildcard.
249 static inline int nlm_compare_locks(const struct file_lock *fl1,
250 const struct file_lock *fl2)
252 return fl1->fl_pid == fl2->fl_pid
253 && fl1->fl_owner == fl2->fl_owner
254 && fl1->fl_start == fl2->fl_start
255 && fl1->fl_end == fl2->fl_end
256 &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK);
259 extern struct lock_manager_operations nlmsvc_lock_operations;
261 #endif /* __KERNEL__ */
263 #endif /* LINUX_LOCKD_LOCKD_H */