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-rw-r--r--include/linux/lockd/lockd.h224
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 000000000000..0d9d22578212
--- /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 */