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1da177e4 LT |
1 | /* |
2 | * linux/include/linux/lockd/lockd.h | |
3 | * | |
4 | * General-purpose lockd include file. | |
5 | * | |
6 | * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #ifndef LINUX_LOCKD_LOCKD_H | |
10 | #define LINUX_LOCKD_LOCKD_H | |
11 | ||
12 | #ifdef __KERNEL__ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/in.h> | |
16 | #include <linux/fs.h> | |
6849c0ca | 17 | #include <linux/kref.h> |
1da177e4 LT |
18 | #include <linux/utsname.h> |
19 | #include <linux/nfsd/nfsfh.h> | |
20 | #include <linux/lockd/bind.h> | |
21 | #include <linux/lockd/xdr.h> | |
22 | #ifdef CONFIG_LOCKD_V4 | |
23 | #include <linux/lockd/xdr4.h> | |
24 | #endif | |
25 | #include <linux/lockd/debug.h> | |
26 | ||
27 | /* | |
28 | * Version string | |
29 | */ | |
30 | #define LOCKD_VERSION "0.5" | |
31 | ||
32 | /* | |
33 | * Default timeout for RPC calls (seconds) | |
34 | */ | |
35 | #define LOCKD_DFLT_TIMEO 10 | |
36 | ||
37 | /* | |
38 | * Lockd host handle (used both by the client and server personality). | |
39 | */ | |
40 | struct nlm_host { | |
41 | struct nlm_host * h_next; /* linked list (hash table) */ | |
42 | struct sockaddr_in h_addr; /* peer address */ | |
43 | struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */ | |
44 | char h_name[20]; /* 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 */ | |
49 | h_inuse : 1, | |
50 | h_killed : 1, | |
51 | h_monitored : 1; | |
52 | wait_queue_head_t h_gracewait; /* wait while reclaiming */ | |
53 | u32 h_state; /* pseudo-state counter */ | |
54 | u32 h_nsmstate; /* true remote NSM state */ | |
55 | u32 h_pidcount; /* Pseudopids */ | |
56 | atomic_t h_count; /* reference count */ | |
57 | struct semaphore h_sema; /* mutex for pmap binding */ | |
58 | unsigned long h_nextrebind; /* next portmap call */ | |
59 | unsigned long h_expires; /* eligible for GC */ | |
60 | struct list_head h_lockowners; /* Lockowners for the client */ | |
61 | spinlock_t h_lock; | |
62 | }; | |
63 | ||
64 | /* | |
65 | * Map an fl_owner_t into a unique 32-bit "pid" | |
66 | */ | |
67 | struct nlm_lockowner { | |
68 | struct list_head list; | |
69 | atomic_t count; | |
70 | ||
71 | struct nlm_host *host; | |
72 | fl_owner_t owner; | |
73 | uint32_t pid; | |
74 | }; | |
75 | ||
ecdbf769 TM |
76 | struct nlm_wait; |
77 | ||
1da177e4 LT |
78 | /* |
79 | * Memory chunk for NLM client RPC request. | |
80 | */ | |
81 | #define NLMCLNT_OHSIZE (sizeof(system_utsname.nodename)+10) | |
82 | struct nlm_rqst { | |
83 | unsigned int a_flags; /* initial RPC task flags */ | |
84 | struct nlm_host * a_host; /* host handle */ | |
85 | struct nlm_args a_args; /* arguments */ | |
86 | struct nlm_res a_res; /* result */ | |
ecdbf769 | 87 | struct nlm_wait * a_block; |
aaaa9942 | 88 | unsigned int a_retries; /* Retry count */ |
1da177e4 LT |
89 | char a_owner[NLMCLNT_OHSIZE]; |
90 | }; | |
91 | ||
92 | /* | |
93 | * This struct describes a file held open by lockd on behalf of | |
94 | * an NFS client. | |
95 | */ | |
96 | struct nlm_file { | |
97 | struct nlm_file * f_next; /* linked list */ | |
98 | struct nfs_fh f_handle; /* NFS file handle */ | |
99 | struct file * f_file; /* VFS file pointer */ | |
100 | struct nlm_share * f_shares; /* DOS shares */ | |
101 | struct nlm_block * f_blocks; /* blocked locks */ | |
102 | unsigned int f_locks; /* guesstimate # of locks */ | |
103 | unsigned int f_count; /* reference count */ | |
104 | struct semaphore f_sema; /* avoid concurrent access */ | |
105 | int f_hash; /* hash of f_handle */ | |
106 | }; | |
107 | ||
108 | /* | |
109 | * This is a server block (i.e. a lock requested by some client which | |
110 | * couldn't be granted because of a conflicting lock). | |
111 | */ | |
112 | #define NLM_NEVER (~(unsigned long) 0) | |
113 | struct nlm_block { | |
6849c0ca | 114 | struct kref b_count; /* Reference count */ |
1da177e4 LT |
115 | struct nlm_block * b_next; /* linked list (all blocks) */ |
116 | struct nlm_block * b_fnext; /* linked list (per file) */ | |
117 | struct nlm_rqst b_call; /* RPC args & callback info */ | |
118 | struct svc_serv * b_daemon; /* NLM service */ | |
119 | struct nlm_host * b_host; /* host handle for RPC clnt */ | |
120 | unsigned long b_when; /* next re-xmit */ | |
121 | unsigned int b_id; /* block id */ | |
122 | unsigned char b_queued; /* re-queued */ | |
123 | unsigned char b_granted; /* VFS granted lock */ | |
1da177e4 LT |
124 | unsigned char b_done; /* callback complete */ |
125 | struct nlm_file * b_file; /* file in question */ | |
126 | }; | |
127 | ||
128 | /* | |
129 | * Valid actions for nlmsvc_traverse_files | |
130 | */ | |
131 | #define NLM_ACT_CHECK 0 /* check for locks */ | |
132 | #define NLM_ACT_MARK 1 /* mark & sweep */ | |
133 | #define NLM_ACT_UNLOCK 2 /* release all locks */ | |
134 | ||
135 | /* | |
136 | * Global variables | |
137 | */ | |
138 | extern struct rpc_program nlm_program; | |
139 | extern struct svc_procedure nlmsvc_procedures[]; | |
140 | #ifdef CONFIG_LOCKD_V4 | |
141 | extern struct svc_procedure nlmsvc_procedures4[]; | |
142 | #endif | |
143 | extern int nlmsvc_grace_period; | |
144 | extern unsigned long nlmsvc_timeout; | |
145 | ||
146 | /* | |
147 | * Lockd client functions | |
148 | */ | |
149 | struct nlm_rqst * nlmclnt_alloc_call(void); | |
ecdbf769 TM |
150 | int nlmclnt_prepare_block(struct nlm_rqst *req, struct nlm_host *host, struct file_lock *fl); |
151 | void nlmclnt_finish_block(struct nlm_rqst *req); | |
152 | long nlmclnt_block(struct nlm_rqst *req, long timeout); | |
5ac5f9d1 | 153 | u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *); |
1da177e4 LT |
154 | void nlmclnt_recovery(struct nlm_host *, u32); |
155 | int nlmclnt_reclaim(struct nlm_host *, struct file_lock *); | |
1da177e4 LT |
156 | |
157 | /* | |
158 | * Host cache | |
159 | */ | |
160 | struct nlm_host * nlmclnt_lookup_host(struct sockaddr_in *, int, int); | |
161 | struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *); | |
162 | struct nlm_host * nlm_lookup_host(int server, struct sockaddr_in *, int, int); | |
163 | struct rpc_clnt * nlm_bind_host(struct nlm_host *); | |
164 | void nlm_rebind_host(struct nlm_host *); | |
165 | struct nlm_host * nlm_get_host(struct nlm_host *); | |
166 | void nlm_release_host(struct nlm_host *); | |
167 | void nlm_shutdown_hosts(void); | |
168 | extern struct nlm_host *nlm_find_client(void); | |
169 | ||
170 | ||
171 | /* | |
172 | * Server-side lock handling | |
173 | */ | |
963d8fe5 | 174 | int nlmsvc_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *); |
1da177e4 LT |
175 | u32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *, |
176 | struct nlm_lock *, int, struct nlm_cookie *); | |
177 | u32 nlmsvc_unlock(struct nlm_file *, struct nlm_lock *); | |
178 | u32 nlmsvc_testlock(struct nlm_file *, struct nlm_lock *, | |
179 | struct nlm_lock *); | |
180 | u32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *); | |
181 | unsigned long nlmsvc_retry_blocked(void); | |
182 | int nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *, | |
183 | int action); | |
184 | void nlmsvc_grant_reply(struct svc_rqst *, struct nlm_cookie *, u32); | |
185 | ||
186 | /* | |
187 | * File handling for the server personality | |
188 | */ | |
189 | u32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **, | |
190 | struct nfs_fh *); | |
191 | void nlm_release_file(struct nlm_file *); | |
192 | void nlmsvc_mark_resources(void); | |
193 | void nlmsvc_free_host_resources(struct nlm_host *); | |
194 | void nlmsvc_invalidate_all(void); | |
195 | ||
196 | static __inline__ struct inode * | |
197 | nlmsvc_file_inode(struct nlm_file *file) | |
198 | { | |
199 | return file->f_file->f_dentry->d_inode; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Compare two host addresses (needs modifying for ipv6) | |
204 | */ | |
205 | static __inline__ int | |
5ac5f9d1 | 206 | nlm_cmp_addr(const struct sockaddr_in *sin1, const struct sockaddr_in *sin2) |
1da177e4 LT |
207 | { |
208 | return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Compare two NLM locks. | |
213 | * When the second lock is of type F_UNLCK, this acts like a wildcard. | |
214 | */ | |
215 | static __inline__ int | |
5ac5f9d1 | 216 | nlm_compare_locks(const struct file_lock *fl1, const struct file_lock *fl2) |
1da177e4 LT |
217 | { |
218 | return fl1->fl_pid == fl2->fl_pid | |
219 | && fl1->fl_start == fl2->fl_start | |
220 | && fl1->fl_end == fl2->fl_end | |
221 | &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK); | |
222 | } | |
223 | ||
224 | extern struct lock_manager_operations nlmsvc_lock_operations; | |
225 | ||
226 | #endif /* __KERNEL__ */ | |
227 | ||
228 | #endif /* LINUX_LOCKD_LOCKD_H */ |