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/* * linux/include/linux/lockd/lockd.h * * General-purpose lockd include file. * * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de> */ #ifndef LINUX_LOCKD_LOCKD_H #define LINUX_LOCKD_LOCKD_H #ifdef __KERNEL__ #include <linux/config.h> #include <linux/in.h> #include <linux/fs.h> #include <linux/utsname.h> #include <linux/nfsd/nfsfh.h> #include <linux/lockd/bind.h> #include <linux/lockd/xdr.h> #ifdef CONFIG_LOCKD_V4 #include <linux/lockd/xdr4.h> #endif #include <linux/lockd/debug.h> /* * Version string */ #define LOCKD_VERSION "0.5" /* * Default timeout for RPC calls (seconds) */ #define LOCKD_DFLT_TIMEO 10 /* * Lockd host handle (used both by the client and server personality). */ struct nlm_host { struct nlm_host * h_next; /* linked list (hash table) */ struct sockaddr_in h_addr; /* peer address */ struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */ char h_name[20]; /* remote hostname */ u32 h_version; /* interface version */ unsigned short h_proto; /* transport proto */ unsigned short h_reclaiming : 1, h_server : 1, /* server side, not client side */ h_inuse : 1, h_killed : 1, h_monitored : 1; wait_queue_head_t h_gracewait; /* wait while reclaiming */ u32 h_state; /* pseudo-state counter */ u32 h_nsmstate; /* true remote NSM state */ u32 h_pidcount; /* Pseudopids */ atomic_t h_count; /* reference count */ struct semaphore h_sema; /* mutex for pmap binding */ unsigned long h_nextrebind; /* next portmap call */ unsigned long h_expires; /* eligible for GC */ struct list_head h_lockowners; /* Lockowners for the client */ spinlock_t h_lock; }; /* * Map an fl_owner_t into a unique 32-bit "pid" */ struct nlm_lockowner { struct list_head list; atomic_t count; struct nlm_host *host; fl_owner_t owner; uint32_t pid; }; struct nlm_wait; /* * Memory chunk for NLM client RPC request. */ #define NLMCLNT_OHSIZE (sizeof(system_utsname.nodename)+10) struct nlm_rqst { unsigned int a_flags; /* initial RPC task flags */ struct nlm_host * a_host; /* host handle */ struct nlm_args a_args; /* arguments */ struct nlm_res a_res; /* result */ struct nlm_wait * a_block; unsigned int a_retries; /* Retry count */ char a_owner[NLMCLNT_OHSIZE]; }; /* * This struct describes a file held open by lockd on behalf of * an NFS client. */ struct nlm_file { struct nlm_file * f_next; /* linked list */ struct nfs_fh f_handle; /* NFS file handle */ struct file * f_file; /* VFS file pointer */ struct nlm_share * f_shares; /* DOS shares */ struct nlm_block * f_blocks; /* blocked locks */ unsigned int f_locks; /* guesstimate # of locks */ unsigned int f_count; /* reference count */ struct semaphore f_sema; /* avoid concurrent access */ int f_hash; /* hash of f_handle */ }; /* * This is a server block (i.e. a lock requested by some client which * couldn't be granted because of a conflicting lock). */ #define NLM_NEVER (~(unsigned long) 0) struct nlm_block { struct nlm_block * b_next; /* linked list (all blocks) */ struct nlm_block * b_fnext; /* linked list (per file) */ struct nlm_rqst b_call; /* RPC args & callback info */ struct svc_serv * b_daemon; /* NLM service */ struct nlm_host * b_host; /* host handle for RPC clnt */ unsigned long b_when; /* next re-xmit */ unsigned int b_id; /* block id */ unsigned char b_queued; /* re-queued */ unsigned char b_granted; /* VFS granted lock */ unsigned char b_incall; /* doing callback */ unsigned char b_done; /* callback complete */ struct nlm_file * b_file; /* file in question */ }; /* * Valid actions for nlmsvc_traverse_files */ #define NLM_ACT_CHECK 0 /* check for locks */ #define NLM_ACT_MARK 1 /* mark & sweep */ #define NLM_ACT_UNLOCK 2 /* release all locks */ /* * Global variables */ extern struct rpc_program nlm_program; extern struct svc_procedure nlmsvc_procedures[]; #ifdef CONFIG_LOCKD_V4 extern struct svc_procedure nlmsvc_procedures4[]; #endif extern int nlmsvc_grace_period; extern unsigned long nlmsvc_timeout; /* * Lockd client functions */ struct nlm_rqst * nlmclnt_alloc_call(void); int nlmclnt_prepare_block(struct nlm_rqst *req, struct nlm_host *host, struct file_lock *fl); void nlmclnt_finish_block(struct nlm_rqst *req); long nlmclnt_block(struct nlm_rqst *req, long timeout); u32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *); void nlmclnt_recovery(struct nlm_host *, u32); int nlmclnt_reclaim(struct nlm_host *, struct file_lock *); int nlmclnt_setgrantargs(struct nlm_rqst *, struct nlm_lock *); void nlmclnt_freegrantargs(struct nlm_rqst *); /* * Host cache */ struct nlm_host * nlmclnt_lookup_host(struct sockaddr_in *, int, int); struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *); struct nlm_host * nlm_lookup_host(int server, struct sockaddr_in *, int, int); struct rpc_clnt * nlm_bind_host(struct nlm_host *); void nlm_rebind_host(struct nlm_host *); struct nlm_host * nlm_get_host(struct nlm_host *); void nlm_release_host(struct nlm_host *); void nlm_shutdown_hosts(void); extern struct nlm_host *nlm_find_client(void); /* * Server-side lock handling */ int nlmsvc_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *); u32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *, struct nlm_lock *, int, struct nlm_cookie *); u32 nlmsvc_unlock(struct nlm_file *, struct nlm_lock *); u32 nlmsvc_testlock(struct nlm_file *, struct nlm_lock *, struct nlm_lock *); u32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *); unsigned long nlmsvc_retry_blocked(void); int nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *, int action); void nlmsvc_grant_reply(struct svc_rqst *, struct nlm_cookie *, u32); /* * File handling for the server personality */ u32 nlm_lookup_file(struct svc_rqst *, struct nlm_file **, struct nfs_fh *); void nlm_release_file(struct nlm_file *); void nlmsvc_mark_resources(void); void nlmsvc_free_host_resources(struct nlm_host *); void nlmsvc_invalidate_all(void); static __inline__ struct inode * nlmsvc_file_inode(struct nlm_file *file) { return file->f_file->f_dentry->d_inode; } /* * Compare two host addresses (needs modifying for ipv6) */ static __inline__ int nlm_cmp_addr(const struct sockaddr_in *sin1, const struct sockaddr_in *sin2) { return sin1->sin_addr.s_addr == sin2->sin_addr.s_addr; } /* * Compare two NLM locks. * When the second lock is of type F_UNLCK, this acts like a wildcard. */ static __inline__ int nlm_compare_locks(const struct file_lock *fl1, const struct file_lock *fl2) { return fl1->fl_pid == fl2->fl_pid && fl1->fl_start == fl2->fl_start && fl1->fl_end == fl2->fl_end &&(fl1->fl_type == fl2->fl_type || fl2->fl_type == F_UNLCK); } extern struct lock_manager_operations nlmsvc_lock_operations; #endif /* __KERNEL__ */ #endif /* LINUX_LOCKD_LOCKD_H */