1 /* 2 * linux/include/linux/lockd/lockd.h 3 * 4 * General-purpose lockd include file. 5 * 6 * Copyright (C) 1996 Olaf Kirch <[email protected]> 7 */ 8 9 #ifndef LINUX_LOCKD_LOCKD_H 10 #define LINUX_LOCKD_LOCKD_H 11 12 #ifdef __KERNEL__ 13 14 #include <linux/in.h> 15 #include <linux/fs.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> 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 hlist_node h_hash; /* doubly linked list */ 41 struct sockaddr_in h_addr; /* peer address */ 42 struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */ 43 char * h_name; /* 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 wait_queue_head_t h_gracewait; /* wait while reclaiming */ 50 struct rw_semaphore h_rwsem; /* Reboot recovery lock */ 51 u32 h_state; /* pseudo-state counter */ 52 u32 h_nsmstate; /* true remote NSM state */ 53 u32 h_pidcount; /* Pseudopids */ 54 atomic_t h_count; /* reference count */ 55 struct mutex h_mutex; /* mutex for pmap binding */ 56 unsigned long h_nextrebind; /* next portmap call */ 57 unsigned long h_expires; /* eligible for GC */ 58 struct list_head h_lockowners; /* Lockowners for the client */ 59 spinlock_t h_lock; 60 struct list_head h_granted; /* Locks in GRANTED state */ 61 struct list_head h_reclaim; /* Locks in RECLAIM state */ 62 struct nsm_handle * h_nsmhandle; /* NSM status handle */ 63 }; 64 65 struct nsm_handle { 66 struct list_head sm_link; 67 atomic_t sm_count; 68 char * sm_name; 69 struct sockaddr_in sm_addr; 70 unsigned int sm_monitored : 1, 71 sm_sticky : 1; /* don't unmonitor */ 72 }; 73 74 /* 75 * Map an fl_owner_t into a unique 32-bit "pid" 76 */ 77 struct nlm_lockowner { 78 struct list_head list; 79 atomic_t count; 80 81 struct nlm_host *host; 82 fl_owner_t owner; 83 uint32_t pid; 84 }; 85 86 struct nlm_wait; 87 88 /* 89 * Memory chunk for NLM client RPC request. 90 */ 91 #define NLMCLNT_OHSIZE ((__NEW_UTS_LEN) + 10u) 92 struct nlm_rqst { 93 unsigned int a_flags; /* initial RPC task flags */ 94 struct nlm_host * a_host; /* host handle */ 95 struct nlm_args a_args; /* arguments */ 96 struct nlm_res a_res; /* result */ 97 struct nlm_block * a_block; 98 unsigned int a_retries; /* Retry count */ 99 u8 a_owner[NLMCLNT_OHSIZE]; 100 }; 101 102 /* 103 * This struct describes a file held open by lockd on behalf of 104 * an NFS client. 105 */ 106 struct nlm_file { 107 struct hlist_node f_list; /* linked list */ 108 struct nfs_fh f_handle; /* NFS file handle */ 109 struct file * f_file; /* VFS file pointer */ 110 struct nlm_share * f_shares; /* DOS shares */ 111 struct list_head f_blocks; /* blocked locks */ 112 unsigned int f_locks; /* guesstimate # of locks */ 113 unsigned int f_count; /* reference count */ 114 struct mutex f_mutex; /* avoid concurrent access */ 115 }; 116 117 /* 118 * This is a server block (i.e. a lock requested by some client which 119 * couldn't be granted because of a conflicting lock). 120 */ 121 #define NLM_NEVER (~(unsigned long) 0) 122 struct nlm_block { 123 struct kref b_count; /* Reference count */ 124 struct list_head b_list; /* linked list of all blocks */ 125 struct list_head b_flist; /* linked list (per file) */ 126 struct nlm_rqst * b_call; /* RPC args & callback info */ 127 struct svc_serv * b_daemon; /* NLM service */ 128 struct nlm_host * b_host; /* host handle for RPC clnt */ 129 unsigned long b_when; /* next re-xmit */ 130 unsigned int b_id; /* block id */ 131 unsigned char b_granted; /* VFS granted lock */ 132 struct nlm_file * b_file; /* file in question */ 133 }; 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 extern int nsm_use_hostnames; 146 147 /* 148 * Lockd client functions 149 */ 150 struct nlm_rqst * nlm_alloc_call(struct nlm_host *host); 151 void nlm_release_call(struct nlm_rqst *); 152 int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *); 153 int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *); 154 struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl); 155 void nlmclnt_finish_block(struct nlm_wait *block); 156 int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout); 157 __be32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *); 158 void nlmclnt_recovery(struct nlm_host *); 159 int nlmclnt_reclaim(struct nlm_host *, struct file_lock *); 160 void nlmclnt_next_cookie(struct nlm_cookie *); 161 162 /* 163 * Host cache 164 */ 165 struct nlm_host * nlmclnt_lookup_host(const struct sockaddr_in *, int, int, const char *, int); 166 struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *, const char *, int); 167 struct rpc_clnt * nlm_bind_host(struct nlm_host *); 168 void nlm_rebind_host(struct nlm_host *); 169 struct nlm_host * nlm_get_host(struct nlm_host *); 170 void nlm_release_host(struct nlm_host *); 171 void nlm_shutdown_hosts(void); 172 extern void nlm_host_rebooted(const struct sockaddr_in *, const char *, int, u32); 173 void nsm_release(struct nsm_handle *); 174 175 176 /* 177 * This is used in garbage collection and resource reclaim 178 * A return value != 0 means destroy the lock/block/share 179 */ 180 typedef int (*nlm_host_match_fn_t)(struct nlm_host *cur, struct nlm_host *ref); 181 182 /* 183 * Server-side lock handling 184 */ 185 __be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *, 186 struct nlm_lock *, int, struct nlm_cookie *); 187 __be32 nlmsvc_unlock(struct nlm_file *, struct nlm_lock *); 188 __be32 nlmsvc_testlock(struct nlm_file *, struct nlm_lock *, 189 struct nlm_lock *); 190 __be32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *); 191 unsigned long nlmsvc_retry_blocked(void); 192 void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *, 193 nlm_host_match_fn_t match); 194 void nlmsvc_grant_reply(struct nlm_cookie *, __be32); 195 196 /* 197 * File handling for the server personality 198 */ 199 __be32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **, 200 struct nfs_fh *); 201 void nlm_release_file(struct nlm_file *); 202 void nlmsvc_mark_resources(void); 203 void nlmsvc_free_host_resources(struct nlm_host *); 204 void nlmsvc_invalidate_all(void); 205 206 static __inline__ struct inode * 207 nlmsvc_file_inode(struct nlm_file *file) 208 { 209 return file->f_file->f_path.dentry->d_inode; 210 } 211 212 /* 213 * Compare two host addresses (needs modifying for ipv6) 214 */ 215 static __inline__ int 216 nlm_cmp_addr(const struct sockaddr_in *sin1, const struct sockaddr_in *sin2) 217 { 218 return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; 219 } 220 221 /* 222 * Compare two NLM locks. 223 * When the second lock is of type F_UNLCK, this acts like a wildcard. 224 */ 225 static __inline__ int 226 nlm_compare_locks(const struct file_lock *fl1, const struct file_lock *fl2) 227 { 228 return fl1->fl_pid == fl2->fl_pid 229 && fl1->fl_owner == fl2->fl_owner 230 && fl1->fl_start == fl2->fl_start 231 && fl1->fl_end == fl2->fl_end 232 &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK); 233 } 234 235 extern struct lock_manager_operations nlmsvc_lock_operations; 236 237 #endif /* __KERNEL__ */ 238 239 #endif /* LINUX_LOCKD_LOCKD_H */ 240