include/linux/nfs_fs.h - pub/scm/linux/kernel/git/joro/linux - Git at Google

 /*
  *  linux/include/linux/nfs_fs.h
  *
  *  Copyright (C) 1992  Rick Sladkey
  *
  *  OS-specific nfs filesystem definitions and declarations
  */

 #ifndef _LINUX_NFS_FS_H
 #define _LINUX_NFS_FS_H

 #include <linux/config.h>
 #include <linux/in.h>
 #include <linux/mm.h>
 #include <linux/pagemap.h>

 #include <linux/nfs_fs_sb.h>

 #include <linux/sunrpc/debug.h>
 #include <linux/sunrpc/auth.h>
 #include <linux/sunrpc/clnt.h>

 #include <linux/nfs.h>
 #include <linux/nfs2.h>
 #include <linux/nfs3.h>
 #include <linux/nfs_xdr.h>

 /*
  * Enable debugging support for nfs client.
  * Requires RPC_DEBUG.
  */
 #ifdef RPC_DEBUG
 # define NFS_DEBUG
 #endif

 /*
  * NFS_MAX_DIRCACHE controls the number of simultaneously cached
  * directory chunks. Each chunk holds the list of nfs_entry's returned
  * in a single readdir call in a memory region of size PAGE_SIZE.
  *
  * Note that at most server->rsize bytes of the cache memory are used.
  */
 #define NFS_MAX_DIRCACHE		16

 #define NFS_MAX_FILE_IO_BUFFER_SIZE	32768
 #define NFS_DEF_FILE_IO_BUFFER_SIZE	4096

 /*
  * The upper limit on timeouts for the exponential backoff algorithm.
  */
 #define NFS_MAX_RPC_TIMEOUT		(6*HZ)
 #define NFS_READ_DELAY			(2*HZ)
 #define NFS_WRITEBACK_DELAY		(5*HZ)
 #define NFS_WRITEBACK_LOCKDELAY		(60*HZ)
 #define NFS_COMMIT_DELAY		(5*HZ)

 /*
  * Size of the lookup cache in units of number of entries cached.
  * It is better not to make this too large although the optimum
  * depends on a usage and environment.
  */
 #define NFS_LOOKUP_CACHE_SIZE		64

 /*
  * superblock magic number for NFS
  */
 #define NFS_SUPER_MAGIC			0x6969

 /*
  * These are the default flags for swap requests
  */
 #define NFS_RPC_SWAPFLAGS		(RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)

 /* Flags in the RPC client structure */
 #define NFS_CLNTF_BUFSIZE	0x0001	/* readdir buffer in longwords */

 #define NFS_RW_SYNC		0x0001	/* O_SYNC handling */
 #define NFS_RW_SWAP		0x0002	/* This is a swap request */

 /*
  * When flushing a cluster of dirty pages, there can be different
  * strategies:
  */
 #define FLUSH_AGING		0	/* only flush old buffers */
 #define FLUSH_SYNC		1	/* file being synced, or contention */
 #define FLUSH_WAIT		2	/* wait for completion */
 #define FLUSH_STABLE		4	/* commit to stable storage */

 #ifdef __KERNEL__

 /*
  * nfs fs inode data in memory
  */
 struct nfs_inode {
 	/*
 	 * The 64bit 'inode number'
 	 */
 	__u64 fileid;

 	/*
 	 * NFS file handle
 	 */
 	struct nfs_fh		fh;

 	/*
 	 * Various flags
 	 */
 	unsigned short		flags;

 	/*
 	 * read_cache_jiffies is when we started read-caching this inode,
 	 * and read_cache_mtime is the mtime of the inode at that time.
 	 * attrtimeo is for how long the cached information is assumed
 	 * to be valid. A successful attribute revalidation doubles
 	 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
 	 * acregmin/acdirmin.
 	 *
 	 * We need to revalidate the cached attrs for this inode if
 	 *
 	 *	jiffies - read_cache_jiffies > attrtimeo
 	 *
 	 * and invalidate any cached data/flush out any dirty pages if
 	 * we find that
 	 *
 	 *	mtime != read_cache_mtime
 	 */
 	unsigned long		read_cache_jiffies;
 	__u64			read_cache_ctime;
 	__u64			read_cache_mtime;
 	__u64			read_cache_isize;
 	unsigned long		attrtimeo;
 	unsigned long		attrtimeo_timestamp;

 	/*
 	 * Timestamp that dates the change made to read_cache_mtime.
 	 * This is of use for dentry revalidation
 	 */
 	unsigned long		cache_mtime_jiffies;

 	/*
 	 * This is the cookie verifier used for NFSv3 readdir
 	 * operations
 	 */
 	__u32			cookieverf[2];

 	/*
 	 * This is the list of dirty unwritten pages.
 	 */
 	struct list_head	read;
 	struct list_head	dirty;
 	struct list_head	commit;
 	struct list_head	writeback;

 	unsigned int		nread,
 				ndirty,
 				ncommit,
 				npages;

 	/* Credentials for shared mmap */
 	struct rpc_cred		*mm_cred;

 	struct inode		vfs_inode;
 };

 /*
  * Legal inode flag values
  */
 #define NFS_INO_STALE		0x0001		/* possible stale inode */
 #define NFS_INO_ADVISE_RDPLUS   0x0002          /* advise readdirplus */
 #define NFS_INO_REVALIDATING	0x0004		/* revalidating attrs */
 #define NFS_IS_SNAPSHOT		0x0010		/* a snapshot file */
 #define NFS_INO_FLUSH		0x0020		/* inode is due for flushing */

 static inline struct nfs_inode *NFS_I(struct inode *inode)
 {
 	return list_entry(inode, struct nfs_inode, vfs_inode);
 }
 #define NFS_SB(s)		((struct nfs_server *)(s->u.generic_sbp))

 #define NFS_FH(inode)			(&NFS_I(inode)->fh)
 #define NFS_SERVER(inode)		(NFS_SB(inode->i_sb))
 #define NFS_CLIENT(inode)		(NFS_SERVER(inode)->client)
 #define NFS_PROTO(inode)		(NFS_SERVER(inode)->rpc_ops)
 #define NFS_REQUESTLIST(inode)		(NFS_SERVER(inode)->rw_requests)
 #define NFS_ADDR(inode)			(RPC_PEERADDR(NFS_CLIENT(inode)))
 #define NFS_CONGESTED(inode)		(RPC_CONGESTED(NFS_CLIENT(inode)))
 #define NFS_COOKIEVERF(inode)		(NFS_I(inode)->cookieverf)
 #define NFS_READTIME(inode)		(NFS_I(inode)->read_cache_jiffies)
 #define NFS_MTIME_UPDATE(inode)		(NFS_I(inode)->cache_mtime_jiffies)
 #define NFS_CACHE_CTIME(inode)		(NFS_I(inode)->read_cache_ctime)
 #define NFS_CACHE_MTIME(inode)		(NFS_I(inode)->read_cache_mtime)
 #define NFS_CACHE_ISIZE(inode)		(NFS_I(inode)->read_cache_isize)
 #define NFS_NEXTSCAN(inode)		(NFS_I(inode)->nextscan)
 #define NFS_CACHEINV(inode) \
 do { \
 	NFS_READTIME(inode) = jiffies - NFS_MAXATTRTIMEO(inode) - 1; \
 } while (0)
 #define NFS_ATTRTIMEO(inode)		(NFS_I(inode)->attrtimeo)
 #define NFS_MINATTRTIMEO(inode) \
 	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
 			       : NFS_SERVER(inode)->acregmin)
 #define NFS_MAXATTRTIMEO(inode) \
 	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
 			       : NFS_SERVER(inode)->acregmax)
 #define NFS_ATTRTIMEO_UPDATE(inode)	(NFS_I(inode)->attrtimeo_timestamp)

 #define NFS_FLAGS(inode)		(NFS_I(inode)->flags)
 #define NFS_REVALIDATING(inode)		(NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
 #define NFS_STALE(inode)		(NFS_FLAGS(inode) & NFS_INO_STALE)

 #define NFS_FILEID(inode)		(NFS_I(inode)->fileid)

 /* Inode Flags */
 #define NFS_USE_READDIRPLUS(inode)	((NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS) ? 1 : 0)

 static inline
 loff_t page_offset(struct page *page)
 {
 	return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
 }

 static inline
 unsigned long page_index(struct page *page)
 {
 	return page->index;
 }

 /*
  * linux/fs/nfs/inode.c
  */
 extern void nfs_zap_caches(struct inode *);
 extern int nfs_inode_is_stale(struct inode *, struct nfs_fh *,
 				struct nfs_fattr *);
 extern struct inode *nfs_fhget(struct dentry *, struct nfs_fh *,
 				struct nfs_fattr *);
 extern int __nfs_refresh_inode(struct inode *, struct nfs_fattr *);
 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
 extern int nfs_permission(struct inode *, int);
 extern int nfs_open(struct inode *, struct file *);
 extern int nfs_release(struct inode *, struct file *);
 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
 extern int nfs_setattr(struct dentry *, struct iattr *);

 /*
  * linux/fs/nfs/file.c
  */
 extern struct inode_operations nfs_file_inode_operations;
 extern struct file_operations nfs_file_operations;
 extern struct address_space_operations nfs_file_aops;

 static __inline__ struct rpc_cred *
 nfs_file_cred(struct file *file)
 {
 	struct rpc_cred *cred = NULL;
 	if (file)
 		cred = (struct rpc_cred *)file->private_data;
 #ifdef RPC_DEBUG
 	if (cred && cred->cr_magic != RPCAUTH_CRED_MAGIC)
 		BUG();
 #endif
 	return cred;
 }

 /*
  * linux/fs/nfs/dir.c
  */
 extern struct inode_operations nfs_dir_inode_operations;
 extern struct file_operations nfs_dir_operations;
 extern struct dentry_operations nfs_dentry_operations;

 /*
  * linux/fs/nfs/symlink.c
  */
 extern struct inode_operations nfs_symlink_inode_operations;

 /*
  * linux/fs/nfs/locks.c
  */
 extern int nfs_lock(struct file *, int, struct file_lock *);

 /*
  * linux/fs/nfs/unlink.c
  */
 extern int  nfs_async_unlink(struct dentry *);
 extern void nfs_complete_unlink(struct dentry *);

 /*
  * linux/fs/nfs/write.c
  */
 extern int  nfs_writepage(struct page *);
 extern int  nfs_flush_incompatible(struct file *file, struct page *page);
 extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
 /*
  * Try to write back everything synchronously (but check the
  * return value!)
  */
 extern int  nfs_sync_file(struct inode *, struct file *, unsigned long, unsigned int, int);
 extern int  nfs_flush_file(struct inode *, struct file *, unsigned long, unsigned int, int);
 extern int  nfs_flush_list(struct list_head *, int, int);
 extern int  nfs_scan_lru_dirty(struct nfs_server *, struct list_head *);
 extern int  nfs_scan_lru_dirty_timeout(struct nfs_server *, struct list_head *);
 #ifdef CONFIG_NFS_V3
 extern int  nfs_commit_file(struct inode *, struct file *, unsigned long, unsigned int, int);
 extern int  nfs_commit_list(struct list_head *, int);
 extern int  nfs_scan_lru_commit(struct nfs_server *, struct list_head *);
 extern int  nfs_scan_lru_commit_timeout(struct nfs_server *, struct list_head *);
 #endif

 static inline int
 nfs_have_read(struct inode *inode)
 {
 	return !list_empty(&NFS_I(inode)->read);
 }

 static inline int
 nfs_have_writebacks(struct inode *inode)
 {
 	return !list_empty(&NFS_I(inode)->writeback);
 }

 static inline int
 nfs_wb_all(struct inode *inode)
 {
 	int error = nfs_sync_file(inode, 0, 0, 0, FLUSH_WAIT);
 	return (error < 0) ? error : 0;
 }

 /*
  * Write back all requests on one page - we do this before reading it.
  */
 static inline int
 nfs_wb_page(struct inode *inode, struct page* page)
 {
 	int error = nfs_sync_file(inode, 0, page_index(page), 1, FLUSH_WAIT | FLUSH_STABLE);
 	return (error < 0) ? error : 0;
 }

 /*
  * Write back all pending writes for one user..
  */
 static inline int
 nfs_wb_file(struct inode *inode, struct file *file)
 {
 	int error = nfs_sync_file(inode, file, 0, 0, FLUSH_WAIT);
 	return (error < 0) ? error : 0;
 }

 /*
  * linux/fs/nfs/read.c
  */
 extern int  nfs_readpage(struct file *, struct page *);
 extern int  nfs_pagein_inode(struct inode *, unsigned long, unsigned int);
 extern int  nfs_pagein_list(struct list_head *, int);
 extern int  nfs_scan_lru_read(struct nfs_server *, struct list_head *);
 extern int  nfs_scan_lru_read_timeout(struct nfs_server *, struct list_head *);

 /*
  * linux/fs/mount_clnt.c
  * (Used only by nfsroot module)
  */
 extern int  nfs_mount(struct sockaddr_in *, char *, struct nfs_fh *);
 extern int  nfs3_mount(struct sockaddr_in *, char *, struct nfs_fh *);

 /*
  * inline functions
  */
 static inline int
 nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
 {
 	if (time_before(jiffies, NFS_READTIME(inode)+NFS_ATTRTIMEO(inode)))
 		return NFS_STALE(inode) ? -ESTALE : 0;
 	return __nfs_revalidate_inode(server, inode);
 }

 static inline int
 nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
 {
 	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
 		return 0;
 	return __nfs_refresh_inode(inode,fattr);
 }

 static inline loff_t
 nfs_size_to_loff_t(__u64 size)
 {
 	loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
 	if (size > maxsz)
 		return maxsz;
 	return (loff_t) size;
 }

 static inline ino_t
 nfs_fileid_to_ino_t(u64 fileid)
 {
 	ino_t ino = (ino_t) fileid;
 	if (sizeof(ino_t) < sizeof(u64))
 		ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
 	return ino;
 }

 static inline time_t
 nfs_time_to_secs(__u64 time)
 {
 	return (time_t)(time >> 32);
 }

 /* NFS root */

 extern void * nfs_root_data(void);

 #define nfs_wait_event(clnt, wq, condition)				\
 ({									\
 	int __retval = 0;						\
 	if (clnt->cl_intr) {						\
 		sigset_t oldmask;					\
 		rpc_clnt_sigmask(clnt, &oldmask);			\
 		__retval = wait_event_interruptible(wq, condition);	\
 		rpc_clnt_sigunmask(clnt, &oldmask);			\
 	} else								\
 		wait_event(wq, condition);				\
 	__retval;							\
 })

 #ifdef CONFIG_NFS_V3

 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 static inline int
 nfs_async_handle_jukebox(struct rpc_task *task)
 {
 	if (task->tk_status != -EJUKEBOX)
 		return 0;
 	task->tk_status = 0;
 	rpc_restart_call(task);
 	rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
 	return 1;
 }

 #else

 static inline int
 nfs_async_handle_jukebox(struct rpc_task *task)
 {
 	return 0;
 }
 #endif /* CONFIG_NFS_V3 */

 #endif /* __KERNEL__ */

 /*
  * NFS debug flags
  */
 #define NFSDBG_VFS		0x0001
 #define NFSDBG_DIRCACHE		0x0002
 #define NFSDBG_LOOKUPCACHE	0x0004
 #define NFSDBG_PAGECACHE	0x0008
 #define NFSDBG_PROC		0x0010
 #define NFSDBG_XDR		0x0020
 #define NFSDBG_FILE		0x0040
 #define NFSDBG_ROOT		0x0080
 #define NFSDBG_ALL		0xFFFF

 #ifdef __KERNEL__
 # undef ifdebug
 # ifdef NFS_DEBUG
 #  define ifdebug(fac)		if (nfs_debug & NFSDBG_##fac)
 # else
 #  define ifdebug(fac)		if (0)
 # endif
 #endif /* __KERNEL */

 #endif
	/*
	* linux/include/linux/nfs_fs.h
	*
	* Copyright (C) 1992 Rick Sladkey
	*
	* OS-specific nfs filesystem definitions and declarations
	*/

	#ifndef _LINUX_NFS_FS_H
	#define _LINUX_NFS_FS_H

	#include <linux/config.h>
	#include <linux/in.h>
	#include <linux/mm.h>
	#include <linux/pagemap.h>

	#include <linux/nfs_fs_sb.h>

	#include <linux/sunrpc/debug.h>
	#include <linux/sunrpc/auth.h>
	#include <linux/sunrpc/clnt.h>

	#include <linux/nfs.h>
	#include <linux/nfs2.h>
	#include <linux/nfs3.h>
	#include <linux/nfs_xdr.h>

	/*
	* Enable debugging support for nfs client.
	* Requires RPC_DEBUG.
	*/
	#ifdef RPC_DEBUG
	# define NFS_DEBUG
	#endif

	/*
	* NFS_MAX_DIRCACHE controls the number of simultaneously cached
	* directory chunks. Each chunk holds the list of nfs_entry's returned
	* in a single readdir call in a memory region of size PAGE_SIZE.
	*
	* Note that at most server->rsize bytes of the cache memory are used.
	*/
	#define NFS_MAX_DIRCACHE 16

	#define NFS_MAX_FILE_IO_BUFFER_SIZE 32768
	#define NFS_DEF_FILE_IO_BUFFER_SIZE 4096

	/*
	* The upper limit on timeouts for the exponential backoff algorithm.
	*/
	#define NFS_MAX_RPC_TIMEOUT (6*HZ)
	#define NFS_READ_DELAY (2*HZ)
	#define NFS_WRITEBACK_DELAY (5*HZ)
	#define NFS_WRITEBACK_LOCKDELAY (60*HZ)
	#define NFS_COMMIT_DELAY (5*HZ)

	/*
	* Size of the lookup cache in units of number of entries cached.
	* It is better not to make this too large although the optimum
	* depends on a usage and environment.
	*/
	#define NFS_LOOKUP_CACHE_SIZE 64

	/*
	* superblock magic number for NFS
	*/
	#define NFS_SUPER_MAGIC 0x6969

	/*
	* These are the default flags for swap requests
	*/
	#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER\|RPC_TASK_ROOTCREDS)

	/* Flags in the RPC client structure */
	#define NFS_CLNTF_BUFSIZE 0x0001 /* readdir buffer in longwords */

	#define NFS_RW_SYNC 0x0001 /* O_SYNC handling */
	#define NFS_RW_SWAP 0x0002 /* This is a swap request */

	/*
	* When flushing a cluster of dirty pages, there can be different
	* strategies:
	*/
	#define FLUSH_AGING 0 /* only flush old buffers */
	#define FLUSH_SYNC 1 /* file being synced, or contention */
	#define FLUSH_WAIT 2 /* wait for completion */
	#define FLUSH_STABLE 4 /* commit to stable storage */

	#ifdef __KERNEL__

	/*
	* nfs fs inode data in memory
	*/
	struct nfs_inode {
	/*
	* The 64bit 'inode number'
	*/
	__u64 fileid;

	/*
	* NFS file handle
	*/
	struct nfs_fh fh;

	/*
	* Various flags
	*/
	unsigned short flags;

	/*
	* read_cache_jiffies is when we started read-caching this inode,
	* and read_cache_mtime is the mtime of the inode at that time.
	* attrtimeo is for how long the cached information is assumed
	* to be valid. A successful attribute revalidation doubles
	* attrtimeo (up to acregmax/acdirmax), a failure resets it to
	* acregmin/acdirmin.
	*
	* We need to revalidate the cached attrs for this inode if
	*
	* jiffies - read_cache_jiffies > attrtimeo
	*
	* and invalidate any cached data/flush out any dirty pages if
	* we find that
	*
	* mtime != read_cache_mtime
	*/
	unsigned long read_cache_jiffies;
	__u64 read_cache_ctime;
	__u64 read_cache_mtime;
	__u64 read_cache_isize;
	unsigned long attrtimeo;
	unsigned long attrtimeo_timestamp;

	/*
	* Timestamp that dates the change made to read_cache_mtime.
	* This is of use for dentry revalidation
	*/
	unsigned long cache_mtime_jiffies;

	/*
	* This is the cookie verifier used for NFSv3 readdir
	* operations
	*/
	__u32 cookieverf[2];

	/*
	* This is the list of dirty unwritten pages.
	*/
	struct list_head read;
	struct list_head dirty;
	struct list_head commit;
	struct list_head writeback;

	unsigned int nread,
	ndirty,
	ncommit,
	npages;

	/* Credentials for shared mmap */
	struct rpc_cred *mm_cred;

	struct inode vfs_inode;
	};

	/*
	* Legal inode flag values
	*/
	#define NFS_INO_STALE 0x0001 /* possible stale inode */
	#define NFS_INO_ADVISE_RDPLUS 0x0002 /* advise readdirplus */
	#define NFS_INO_REVALIDATING 0x0004 /* revalidating attrs */
	#define NFS_IS_SNAPSHOT 0x0010 /* a snapshot file */
	#define NFS_INO_FLUSH 0x0020 /* inode is due for flushing */

	static inline struct nfs_inode NFS_I(struct inode inode)
	{
	return list_entry(inode, struct nfs_inode, vfs_inode);
	}
	#define NFS_SB(s) ((struct nfs_server *)(s->u.generic_sbp))

	#define NFS_FH(inode) (&NFS_I(inode)->fh)
	#define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
	#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
	#define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
	#define NFS_REQUESTLIST(inode) (NFS_SERVER(inode)->rw_requests)
	#define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
	#define NFS_CONGESTED(inode) (RPC_CONGESTED(NFS_CLIENT(inode)))
	#define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
	#define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
	#define NFS_MTIME_UPDATE(inode) (NFS_I(inode)->cache_mtime_jiffies)
	#define NFS_CACHE_CTIME(inode) (NFS_I(inode)->read_cache_ctime)
	#define NFS_CACHE_MTIME(inode) (NFS_I(inode)->read_cache_mtime)
	#define NFS_CACHE_ISIZE(inode) (NFS_I(inode)->read_cache_isize)
	#define NFS_NEXTSCAN(inode) (NFS_I(inode)->nextscan)
	#define NFS_CACHEINV(inode) \
	do { \
	NFS_READTIME(inode) = jiffies - NFS_MAXATTRTIMEO(inode) - 1; \
	} while (0)
	#define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
	#define NFS_MINATTRTIMEO(inode) \
	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
	: NFS_SERVER(inode)->acregmin)
	#define NFS_MAXATTRTIMEO(inode) \
	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
	: NFS_SERVER(inode)->acregmax)
	#define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)

	#define NFS_FLAGS(inode) (NFS_I(inode)->flags)
	#define NFS_REVALIDATING(inode) (NFS_FLAGS(inode) & NFS_INO_REVALIDATING)
	#define NFS_STALE(inode) (NFS_FLAGS(inode) & NFS_INO_STALE)

	#define NFS_FILEID(inode) (NFS_I(inode)->fileid)

	/* Inode Flags */
	#define NFS_USE_READDIRPLUS(inode) ((NFS_FLAGS(inode) & NFS_INO_ADVISE_RDPLUS) ? 1 : 0)

	static inline
	loff_t page_offset(struct page *page)
	{
	return ((loff_t)page->index) << PAGE_CACHE_SHIFT;
	}

	static inline
	unsigned long page_index(struct page *page)
	{
	return page->index;
	}

	/*
	* linux/fs/nfs/inode.c
	*/
	extern void nfs_zap_caches(struct inode *);
	extern int nfs_inode_is_stale(struct inode , struct nfs_fh ,
	struct nfs_fattr *);
	extern struct inode nfs_fhget(struct dentry , struct nfs_fh *,
	struct nfs_fattr *);
	extern int __nfs_refresh_inode(struct inode , struct nfs_fattr );
	extern int nfs_getattr(struct vfsmount , struct dentry , struct kstat *);
	extern int nfs_permission(struct inode *, int);
	extern int nfs_open(struct inode , struct file );
	extern int nfs_release(struct inode , struct file );
	extern int __nfs_revalidate_inode(struct nfs_server , struct inode );
	extern int nfs_setattr(struct dentry , struct iattr );

	/*
	* linux/fs/nfs/file.c
	*/
	extern struct inode_operations nfs_file_inode_operations;
	extern struct file_operations nfs_file_operations;
	extern struct address_space_operations nfs_file_aops;

	static __inline__ struct rpc_cred *
	nfs_file_cred(struct file *file)
	{
	struct rpc_cred *cred = NULL;
	if (file)
	cred = (struct rpc_cred *)file->private_data;
	#ifdef RPC_DEBUG
	if (cred && cred->cr_magic != RPCAUTH_CRED_MAGIC)
	BUG();
	#endif
	return cred;
	}

	/*
	* linux/fs/nfs/dir.c
	*/
	extern struct inode_operations nfs_dir_inode_operations;
	extern struct file_operations nfs_dir_operations;
	extern struct dentry_operations nfs_dentry_operations;

	/*
	* linux/fs/nfs/symlink.c
	*/
	extern struct inode_operations nfs_symlink_inode_operations;

	/*
	* linux/fs/nfs/locks.c
	*/
	extern int nfs_lock(struct file , int, struct file_lock );

	/*
	* linux/fs/nfs/unlink.c
	*/
	extern int nfs_async_unlink(struct dentry *);
	extern void nfs_complete_unlink(struct dentry *);

	/*
	* linux/fs/nfs/write.c
	*/
	extern int nfs_writepage(struct page *);
	extern int nfs_flush_incompatible(struct file file, struct page page);
	extern int nfs_updatepage(struct file , struct page , unsigned int, unsigned int);
	/*
	* Try to write back everything synchronously (but check the
	* return value!)
	*/
	extern int nfs_sync_file(struct inode , struct file , unsigned long, unsigned int, int);
	extern int nfs_flush_file(struct inode , struct file , unsigned long, unsigned int, int);
	extern int nfs_flush_list(struct list_head *, int, int);
	extern int nfs_scan_lru_dirty(struct nfs_server , struct list_head );
	extern int nfs_scan_lru_dirty_timeout(struct nfs_server , struct list_head );
	#ifdef CONFIG_NFS_V3
	extern int nfs_commit_file(struct inode , struct file , unsigned long, unsigned int, int);
	extern int nfs_commit_list(struct list_head *, int);
	extern int nfs_scan_lru_commit(struct nfs_server , struct list_head );
	extern int nfs_scan_lru_commit_timeout(struct nfs_server , struct list_head );
	#endif

	static inline int
	nfs_have_read(struct inode *inode)
	{
	return !list_empty(&NFS_I(inode)->read);
	}

	static inline int
	nfs_have_writebacks(struct inode *inode)
	{
	return !list_empty(&NFS_I(inode)->writeback);
	}

	static inline int
	nfs_wb_all(struct inode *inode)
	{
	int error = nfs_sync_file(inode, 0, 0, 0, FLUSH_WAIT);
	return (error < 0) ? error : 0;
	}

	/*
	* Write back all requests on one page - we do this before reading it.
	*/
	static inline int
	nfs_wb_page(struct inode inode, struct page page)
	{
	int error = nfs_sync_file(inode, 0, page_index(page), 1, FLUSH_WAIT \| FLUSH_STABLE);
	return (error < 0) ? error : 0;
	}

	/*
	* Write back all pending writes for one user..
	*/
	static inline int
	nfs_wb_file(struct inode inode, struct file file)
	{
	int error = nfs_sync_file(inode, file, 0, 0, FLUSH_WAIT);
	return (error < 0) ? error : 0;
	}

	/*
	* linux/fs/nfs/read.c
	*/
	extern int nfs_readpage(struct file , struct page );
	extern int nfs_pagein_inode(struct inode *, unsigned long, unsigned int);
	extern int nfs_pagein_list(struct list_head *, int);
	extern int nfs_scan_lru_read(struct nfs_server , struct list_head );
	extern int nfs_scan_lru_read_timeout(struct nfs_server , struct list_head );

	/*
	* linux/fs/mount_clnt.c
	* (Used only by nfsroot module)
	*/
	extern int nfs_mount(struct sockaddr_in , char , struct nfs_fh *);
	extern int nfs3_mount(struct sockaddr_in , char , struct nfs_fh *);

	/*
	* inline functions
	*/
	static inline int
	nfs_revalidate_inode(struct nfs_server server, struct inode inode)
	{
	if (time_before(jiffies, NFS_READTIME(inode)+NFS_ATTRTIMEO(inode)))
	return NFS_STALE(inode) ? -ESTALE : 0;
	return __nfs_revalidate_inode(server, inode);
	}

	static inline int
	nfs_refresh_inode(struct inode inode, struct nfs_fattr fattr)
	{
	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
	return 0;
	return __nfs_refresh_inode(inode,fattr);
	}

	static inline loff_t
	nfs_size_to_loff_t(__u64 size)
	{
	loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
	if (size > maxsz)
	return maxsz;
	return (loff_t) size;
	}

	static inline ino_t
	nfs_fileid_to_ino_t(u64 fileid)
	{
	ino_t ino = (ino_t) fileid;
	if (sizeof(ino_t) < sizeof(u64))
	ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
	return ino;
	}

	static inline time_t
	nfs_time_to_secs(__u64 time)
	{
	return (time_t)(time >> 32);
	}

	/* NFS root */

	extern void * nfs_root_data(void);

	#define nfs_wait_event(clnt, wq, condition) \
	({ \
	int __retval = 0; \
	if (clnt->cl_intr) { \
	sigset_t oldmask; \
	rpc_clnt_sigmask(clnt, &oldmask); \
	__retval = wait_event_interruptible(wq, condition); \
	rpc_clnt_sigunmask(clnt, &oldmask); \
	} else \
	wait_event(wq, condition); \
	__retval; \
	})

	#ifdef CONFIG_NFS_V3

	#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
	static inline int
	nfs_async_handle_jukebox(struct rpc_task *task)
	{
	if (task->tk_status != -EJUKEBOX)
	return 0;
	task->tk_status = 0;
	rpc_restart_call(task);
	rpc_delay(task, NFS_JUKEBOX_RETRY_TIME);
	return 1;
	}

	#else

	static inline int
	nfs_async_handle_jukebox(struct rpc_task *task)
	{
	return 0;
	}
	#endif /* CONFIG_NFS_V3 */

	#endif /* __KERNEL__ */

	/*
	* NFS debug flags
	*/
	#define NFSDBG_VFS 0x0001
	#define NFSDBG_DIRCACHE 0x0002
	#define NFSDBG_LOOKUPCACHE 0x0004
	#define NFSDBG_PAGECACHE 0x0008
	#define NFSDBG_PROC 0x0010
	#define NFSDBG_XDR 0x0020
	#define NFSDBG_FILE 0x0040
	#define NFSDBG_ROOT 0x0080
	#define NFSDBG_ALL 0xFFFF

	#ifdef __KERNEL__
	# undef ifdebug
	# ifdef NFS_DEBUG
	# define ifdebug(fac) if (nfs_debug & NFSDBG_##fac)
	# else
	# define ifdebug(fac) if (0)
	# endif
	#endif /* __KERNEL */

	#endif