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