patch-2.1.32 linux/include/linux/lockd/lockd.h

• Lines: 197
• Date: Fri Apr 4 12:19:14 1997
• Orig file: v2.1.31/linux/include/linux/lockd/lockd.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.31/linux/include/linux/lockd/lockd.h linux/include/linux/lockd/lockd.h
@@ -0,0 +1,196 @@
+/*
+ * 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/utsname.h>
+#include <linux/nfsd/nfsfh.h>
+#include <linux/lockd/bind.h>
+#include <linux/lockd/xdr.h>
+#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_monitored  : 1;
+	struct wait_queue *	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 knfs_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 */
+};
+
+/*
+ * 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[];
+extern unsigned long		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 *);
+void		  nlm_release_host(struct nlm_host *);
+void		  nlm_shutdown_hosts(void);
+
+/*
+ * Server-side lock handling
+ */
+u32		  nlmsvc_lock(struct svc_rqst *, struct nlm_file *,
+					struct nlm_lock *, int, u32);
+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 *);
+
+extern __inline__ struct inode *
+nlmsvc_file_inode(struct nlm_file *file)
+{
+	return file->f_file.f_inode;
+}
+
+/*
+ * Compare two host addresses (needs modifying for ipv6)
+ */
+extern __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.
+ */
+extern __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 */