diff options
Diffstat (limited to 'include/linux/lockd/lockd.h')
| -rw-r--r-- | include/linux/lockd/lockd.h | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h new file mode 100644 index 00000000000..0d9d2257821 --- /dev/null +++ b/include/linux/lockd/lockd.h @@ -0,0 +1,224 @@ +/* + * 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; +}; + +/* + * 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_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(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, 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); +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(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); +} + +extern struct lock_manager_operations nlmsvc_lock_operations; + +#endif /* __KERNEL__ */ + +#endif /* LINUX_LOCKD_LOCKD_H */ |