lockd.h
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上传日期:2013-04-10
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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 "0.4"
- /*
- * 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 svc_client * h_exportent; /* NFS client */
- 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_authflavor; /* RPC authentication type */
- unsigned short h_reclaiming : 1,
- 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 */
- unsigned int 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 */
- };
- /*
- * 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 */
- 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_call(struct nlm_rqst *, u32);
- int nlmclnt_async_call(struct nlm_rqst *, u32, rpc_action);
- int nlmclnt_block(struct nlm_host *, struct file_lock *, u32 *);
- int nlmclnt_cancel(struct nlm_host *, struct file_lock *);
- u32 nlmclnt_grant(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(struct svc_client *,
- 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);
- /*
- * Server-side lock handling
- */
- int nlmsvc_async_call(struct nlm_rqst *, u32, rpc_action);
- 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);
- /*
- * 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 *);
- 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(struct sockaddr_in *sin1, 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(struct file_lock *fl1, 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);
- }
- #endif /* __KERNEL__ */
- #endif /* LINUX_LOCKD_LOCKD_H */