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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/in.h>
#include <linux/fs.h>
#include <linux/kref.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 hlist_node h_hash; /* doubly linked list */
struct sockaddr_in h_addr; /* peer address */
struct rpc_clnt * h_rpcclnt; /* RPC client to talk to peer */
char * h_name; /* 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;
wait_queue_head_t h_gracewait; /* wait while reclaiming */
struct rw_semaphore h_rwsem; /* Reboot recovery lock */
u32 h_state; /* pseudo-state counter */
u32 h_nsmstate; /* true remote NSM state */
u32 h_pidcount; /* Pseudopids */
atomic_t h_count; /* reference count */
struct mutex h_mutex; /* 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;
struct list_head h_granted; /* Locks in GRANTED state */
struct list_head h_reclaim; /* Locks in RECLAIM state */
struct nsm_handle * h_nsmhandle; /* NSM status handle */
};
struct nsm_handle {
struct list_head sm_link;
atomic_t sm_count;
char * sm_name;
struct sockaddr_in sm_addr;
unsigned int sm_monitored : 1,
sm_sticky : 1; /* don't unmonitor */
};
/*
* 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(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_block * a_block;
unsigned int a_retries; /* Retry count */
u8 a_owner[NLMCLNT_OHSIZE];
};
/*
* This struct describes a file held open by lockd on behalf of
* an NFS client.
*/
struct nlm_file {
struct hlist_node f_list; /* 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 list_head f_blocks; /* blocked locks */
unsigned int f_locks; /* guesstimate # of locks */
unsigned int f_count; /* reference count */
struct mutex f_mutex; /* avoid concurrent access */
};
/*
* 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)
/* timeout on non-blocking call: */
#define NLM_TIMEOUT (7 * HZ)
struct nlm_block {
struct kref b_count; /* Reference count */
struct list_head b_list; /* linked list of all blocks */
struct list_head b_flist; /* 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_granted; /* VFS granted lock */
struct nlm_file * b_file; /* file in question */
struct cache_req * b_cache_req; /* deferred request handling */
struct file_lock * b_fl; /* set for GETLK */
struct cache_deferred_req * b_deferred_req;
unsigned int b_flags; /* block flags */
#define B_QUEUED 1 /* lock queued */
#define B_GOT_CALLBACK 2 /* got lock or conflicting lock */
#define B_TIMED_OUT 4 /* filesystem too slow to respond */
};
/*
* 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;
extern int nsm_use_hostnames;
/*
* Lockd client functions
*/
struct nlm_rqst * nlm_alloc_call(struct nlm_host *host);
void nlm_release_call(struct nlm_rqst *);
int nlm_async_call(struct nlm_rqst *, u32, const struct rpc_call_ops *);
int nlm_async_reply(struct nlm_rqst *, u32, const struct rpc_call_ops *);
struct nlm_wait * nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl);
void nlmclnt_finish_block(struct nlm_wait *block);
int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout);
__be32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *);
void nlmclnt_recovery(struct nlm_host *);
int nlmclnt_reclaim(struct nlm_host *, struct file_lock *);
void nlmclnt_next_cookie(struct nlm_cookie *);
/*
* Host cache
*/
struct nlm_host * nlmclnt_lookup_host(const struct sockaddr_in *, int, int, const char *, int);
struct nlm_host * nlmsvc_lookup_host(struct svc_rqst *, const char *, 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 void nlm_host_rebooted(const struct sockaddr_in *, const char *, int, u32);
void nsm_release(struct nsm_handle *);
/*
* This is used in garbage collection and resource reclaim
* A return value != 0 means destroy the lock/block/share
*/
typedef int (*nlm_host_match_fn_t)(struct nlm_host *cur, struct nlm_host *ref);
/*
* Server-side lock handling
*/
__be32 nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
struct nlm_lock *, int, struct nlm_cookie *);
__be32 nlmsvc_unlock(struct nlm_file *, struct nlm_lock *);
__be32 nlmsvc_testlock(struct nlm_file *, struct nlm_lock *,
struct nlm_lock *);
__be32 nlmsvc_cancel_blocked(struct nlm_file *, struct nlm_lock *);
unsigned long nlmsvc_retry_blocked(void);
void nlmsvc_traverse_blocks(struct nlm_host *, struct nlm_file *,
nlm_host_match_fn_t match);
void nlmsvc_grant_reply(struct nlm_cookie *, __be32);
/*
* File handling for the server personality
*/
__be32 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_path.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_owner == fl2->fl_owner
&& 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 */
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