[net-next-2.6.git] / include / linux / nfs_fs.h

/*
 *  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/rwsem.h>
#include <linux/wait.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/nfs4.h>
#include <linux/nfs_xdr.h>
#include <linux/rwsem.h>
#include <linux/mempool.h>

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

/* Default timeout values */
#define NFS_MAX_UDP_TIMEOUT	(60*HZ)
#define NFS_MAX_TCP_TIMEOUT	(600*HZ)

/*
 * 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)

/*
 * When flushing a cluster of dirty pages, there can be different
 * strategies:
 */
#define FLUSH_SYNC		1	/* file being synced, or contention */
#define FLUSH_STABLE		4	/* commit to stable storage */
#define FLUSH_LOWPRI		8	/* low priority background flush */
#define FLUSH_HIGHPRI		16	/* high priority memory reclaim flush */
#define FLUSH_NOCOMMIT		32	/* Don't send the NFSv3/v4 COMMIT */

#ifdef __KERNEL__

/*
 * NFSv3/v4 Access mode cache entry
 */
struct nfs_access_entry {
	unsigned long		jiffies;
	struct rpc_cred *	cred;
	int			mask;
};

struct nfs4_state;
struct nfs_open_context {
	atomic_t count;
	struct vfsmount *vfsmnt;
	struct dentry *dentry;
	struct rpc_cred *cred;
	struct nfs4_state *state;
	fl_owner_t lockowner;
	int mode;
	int error;

	struct list_head list;

	__u64 dir_cookie;
};

/*
 * NFSv4 delegation
 */
struct nfs_delegation;

struct posix_acl;

/*
 * 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 long		flags;			/* atomic bit ops */
	unsigned long		cache_validity;		/* bit mask */

	/*
	 * read_cache_jiffies is when we started read-caching this inode.
	 * 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
	 */
	unsigned long		read_cache_jiffies;
	unsigned long		attrtimeo;
	unsigned long		attrtimeo_timestamp;
	__u64			change_attr;		/* v4 only */

	unsigned long		last_updated;
	/* "Generation counter" for the attribute cache. This is
	 * bumped whenever we update the metadata on the
	 * server.
	 */
	unsigned long		cache_change_attribute;
	/*
	 * Counter indicating the number of outstanding requests that
	 * will cause a file data update.
	 */
	atomic_t		data_updates;

	struct nfs_access_entry	cache_access;
#ifdef CONFIG_NFS_V3_ACL
	struct posix_acl	*acl_access;
	struct posix_acl	*acl_default;
#endif

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

	/*
	 * This is the list of dirty unwritten pages.
	 */
	spinlock_t		req_lock;
	struct list_head	dirty;
	struct list_head	commit;
	struct radix_tree_root	nfs_page_tree;

	unsigned int		ndirty,
				ncommit,
				npages;

	/* Open contexts for shared mmap writes */
	struct list_head	open_files;

#ifdef CONFIG_NFS_V4
	struct nfs4_cached_acl	*nfs4_acl;
        /* NFSv4 state */
	struct list_head	open_states;
	struct nfs_delegation	*delegation;
	int			 delegation_state;
	struct rw_semaphore	rwsem;
#endif /* CONFIG_NFS_V4*/
	struct inode		vfs_inode;
};

/*
 * Cache validity bit flags
 */
#define NFS_INO_INVALID_ATTR	0x0001		/* cached attrs are invalid */
#define NFS_INO_INVALID_DATA	0x0002		/* cached data is invalid */
#define NFS_INO_INVALID_ATIME	0x0004		/* cached atime is invalid */
#define NFS_INO_INVALID_ACCESS	0x0008		/* cached access cred invalid */
#define NFS_INO_INVALID_ACL	0x0010		/* cached acls are invalid */
#define NFS_INO_REVAL_PAGECACHE	0x0020		/* must revalidate pagecache */

/*
 * Bit offsets in flags field
 */
#define NFS_INO_REVALIDATING	(0)		/* revalidating attrs */
#define NFS_INO_ADVISE_RDPLUS	(1)		/* advise readdirplus */
#define NFS_INO_STALE		(2)		/* possible stale inode */

static inline struct nfs_inode *NFS_I(struct inode *inode)
{
	return container_of(inode, struct nfs_inode, vfs_inode);
}
#define NFS_SB(s)		((struct nfs_server *)(s->s_fs_info))

#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_ADDR(inode)			(RPC_PEERADDR(NFS_CLIENT(inode)))
#define NFS_COOKIEVERF(inode)		(NFS_I(inode)->cookieverf)
#define NFS_READTIME(inode)		(NFS_I(inode)->read_cache_jiffies)
#define NFS_CHANGE_ATTR(inode)		(NFS_I(inode)->change_attr)
#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_STALE(inode)		(test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))

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

static inline int nfs_caches_unstable(struct inode *inode)
{
	return atomic_read(&NFS_I(inode)->data_updates) != 0;
}

static inline void nfs_mark_for_revalidate(struct inode *inode)
{
	spin_lock(&inode->i_lock);
	NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
	spin_unlock(&inode->i_lock);
}

static inline void NFS_CACHEINV(struct inode *inode)
{
	if (!nfs_caches_unstable(inode))
		nfs_mark_for_revalidate(inode);
}

static inline int nfs_server_capable(struct inode *inode, int cap)
{
	return NFS_SERVER(inode)->caps & cap;
}

static inline int NFS_USE_READDIRPLUS(struct inode *inode)
{
	return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
}

/**
 * nfs_save_change_attribute - Returns the inode attribute change cookie
 * @inode - pointer to inode
 * The "change attribute" is updated every time we finish an operation
 * that will result in a metadata change on the server.
 */
static inline long nfs_save_change_attribute(struct inode *inode)
{
	return NFS_I(inode)->cache_change_attribute;
}

/**
 * nfs_verify_change_attribute - Detects NFS inode cache updates
 * @inode - pointer to inode
 * @chattr - previously saved change attribute
 * Return "false" if metadata has been updated (or is in the process of
 * being updated) since the change attribute was saved.
 */
static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
{
	return !nfs_caches_unstable(inode)
		&& time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
}

/*
 * linux/fs/nfs/inode.c
 */
extern int nfs_sync_mapping(struct address_space *mapping);
extern void nfs_zap_caches(struct inode *);
extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
				struct nfs_fattr *);
extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern int nfs_permission(struct inode *, int, struct nameidata *);
extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
extern int nfs_open(struct inode *, struct file *);
extern int nfs_release(struct inode *, struct file *);
extern int nfs_attribute_timeout(struct inode *inode);
extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_setattr(struct dentry *, struct iattr *);
extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
extern void nfs_begin_attr_update(struct inode *);
extern void nfs_end_attr_update(struct inode *);
extern void nfs_begin_data_update(struct inode *);
extern void nfs_end_data_update(struct inode *);
extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
extern void put_nfs_open_context(struct nfs_open_context *ctx);
extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);

/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
extern u32 root_nfs_parse_addr(char *name); /*__init*/

static inline void nfs_fattr_init(struct nfs_fattr *fattr)
{
	fattr->valid = 0;
	fattr->time_start = jiffies;
}

/*
 * linux/fs/nfs/file.c
 */
extern struct inode_operations nfs_file_inode_operations;
#ifdef CONFIG_NFS_V3
extern struct inode_operations nfs3_file_inode_operations;
#endif /* CONFIG_NFS_V3 */
extern const 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)
{
	if (file != NULL) {
		struct nfs_open_context *ctx;

		ctx = (struct nfs_open_context*)file->private_data;
		return ctx->cred;
	}
	return NULL;
}

/*
 * linux/fs/nfs/xattr.c
 */
#ifdef CONFIG_NFS_V3_ACL
extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
extern int nfs3_setxattr(struct dentry *, const char *,
			const void *, size_t, int);
extern int nfs3_removexattr (struct dentry *, const char *name);
#else
# define nfs3_listxattr NULL
# define nfs3_getxattr NULL
# define nfs3_setxattr NULL
# define nfs3_removexattr NULL
#endif

/*
 * linux/fs/nfs/direct.c
 */
extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
			unsigned long);
extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
			size_t count, loff_t pos);
extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
			size_t count, loff_t pos);

/*
 * linux/fs/nfs/dir.c
 */
extern struct inode_operations nfs_dir_inode_operations;
#ifdef CONFIG_NFS_V3
extern struct inode_operations nfs3_dir_inode_operations;
#endif /* CONFIG_NFS_V3 */
extern const struct file_operations nfs_dir_operations;
extern struct dentry_operations nfs_dentry_operations;

extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);

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

/*
 * linux/fs/nfs/sysctl.c
 */
#ifdef CONFIG_SYSCTL
extern int nfs_register_sysctl(void);
extern void nfs_unregister_sysctl(void);
#else
#define nfs_register_sysctl() 0
#define nfs_unregister_sysctl() do { } while(0)
#endif

/*
 * 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 *page, struct writeback_control *wbc);
extern int  nfs_writepages(struct address_space *, struct writeback_control *);
extern int  nfs_flush_incompatible(struct file *file, struct page *page);
extern int  nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
extern int nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
extern void nfs_writedata_release(void *);

#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount);
void nfs_commit_free(struct nfs_write_data *p);
#endif

/*
 * Try to write back everything synchronously (but check the
 * return value!)
 */
extern int  nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int  nfs_commit_inode(struct inode *, int);
extern void nfs_commit_release(void *wdata);
#else
static inline int
nfs_commit_inode(struct inode *inode, int how)
{
	return 0;
}
#endif

static inline int
nfs_have_writebacks(struct inode *inode)
{
	return NFS_I(inode)->npages != 0;
}

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

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

static inline int nfs_wb_page(struct inode *inode, struct page* page)
{
	return nfs_wb_page_priority(inode, page, 0);
}

/*
 * Allocate and free nfs_write_data structures
 */
extern struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount);
extern void nfs_writedata_free(struct nfs_write_data *p);

/*
 * linux/fs/nfs/read.c
 */
extern int  nfs_readpage(struct file *, struct page *);
extern int  nfs_readpages(struct file *, struct address_space *,
		struct list_head *, unsigned);
extern int  nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
extern void nfs_readdata_release(void *data);

/*
 * Allocate and free nfs_read_data structures
 */
extern struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount);
extern void nfs_readdata_free(struct nfs_read_data *p);

/*
 * linux/fs/nfs3proc.c
 */
#ifdef CONFIG_NFS_V3_ACL
extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
extern int nfs3_proc_setacl(struct inode *inode, int type,
			    struct posix_acl *acl);
extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
		mode_t mode);
extern void nfs3_forget_cached_acls(struct inode *inode);
#else
static inline int nfs3_proc_set_default_acl(struct inode *dir,
					    struct inode *inode,
					    mode_t mode)
{
	return 0;
}

static inline void nfs3_forget_cached_acls(struct inode *inode)
{
}
#endif /* CONFIG_NFS_V3_ACL */

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

/*
 * inline functions
 */

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;
}

/* 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;							\
})

#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)

#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_CALLBACK		0x0100
#define NFSDBG_ALL		0xFFFF

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

#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/linux/nfs_fs.h
	3	*
	4	* Copyright (C) 1992 Rick Sladkey
	5	*
	6	* OS-specific nfs filesystem definitions and declarations
	7	*/
	8
	9	#ifndef _LINUX_NFS_FS_H
	10	#define _LINUX_NFS_FS_H
	11
	12	#include <linux/config.h>
	13	#include <linux/in.h>
	14	#include <linux/mm.h>
	15	#include <linux/pagemap.h>
	16	#include <linux/rwsem.h>
	17	#include <linux/wait.h>
1da177e4 LT	18
	19	#include <linux/nfs_fs_sb.h>
	20
	21	#include <linux/sunrpc/debug.h>
	22	#include <linux/sunrpc/auth.h>
	23	#include <linux/sunrpc/clnt.h>
	24
	25	#include <linux/nfs.h>
	26	#include <linux/nfs2.h>
	27	#include <linux/nfs3.h>
	28	#include <linux/nfs4.h>
	29	#include <linux/nfs_xdr.h>
	30	#include <linux/rwsem.h>
1da177e4 LT	31	#include <linux/mempool.h>
	32
	33	/*
	34	* Enable debugging support for nfs client.
	35	* Requires RPC_DEBUG.
	36	*/
	37	#ifdef RPC_DEBUG
	38	# define NFS_DEBUG
	39	#endif
	40
03bf4b70 CL	41	/* Default timeout values */
	42	#define NFS_MAX_UDP_TIMEOUT (60*HZ)
	43	#define NFS_MAX_TCP_TIMEOUT (600*HZ)
	44
1da177e4 LT	45	/*
	46	* superblock magic number for NFS
	47	*/
	48	#define NFS_SUPER_MAGIC 0x6969
	49
	50	/*
	51	* These are the default flags for swap requests
	52	*/
	53	#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER\|RPC_TASK_ROOTCREDS)
	54
1da177e4 LT	55	/*
	56	* When flushing a cluster of dirty pages, there can be different
	57	* strategies:
	58	*/
1da177e4	59	#define FLUSH_SYNC 1 /* file being synced, or contention */
1da177e4 LT	60	#define FLUSH_STABLE 4 /* commit to stable storage */
	61	#define FLUSH_LOWPRI 8 /* low priority background flush */
	62	#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
70b9ecbd	63	#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
1da177e4 LT	64
	65	#ifdef __KERNEL__
	66
	67	/*
	68	* NFSv3/v4 Access mode cache entry
	69	*/
	70	struct nfs_access_entry {
	71	unsigned long jiffies;
	72	struct rpc_cred * cred;
	73	int mask;
	74	};
	75
	76	struct nfs4_state;
	77	struct nfs_open_context {
	78	atomic_t count;
b92dccf6	79	struct vfsmount *vfsmnt;
1da177e4 LT	80	struct dentry *dentry;
	81	struct rpc_cred *cred;
	82	struct nfs4_state *state;
	83	fl_owner_t lockowner;
	84	int mode;
	85	int error;
	86
	87	struct list_head list;
00a92642	88
00a92642	89	__u64 dir_cookie;
1da177e4 LT	90	};
	91
	92	/*
	93	* NFSv4 delegation
	94	*/
	95	struct nfs_delegation;
	96
5c6a9f7d AG	97	struct posix_acl;
5c6a9f7d AG	98
1da177e4 LT	99	/*
	100	* nfs fs inode data in memory
	101	*/
	102	struct nfs_inode {
	103	/*
	104	* The 64bit 'inode number'
	105	*/
	106	__u64 fileid;
	107
	108	/*
	109	* NFS file handle
	110	*/
	111	struct nfs_fh fh;
	112
	113	/*
	114	* Various flags
	115	*/
412d582e CL	116	unsigned long flags; /* atomic bit ops */
412d582e CL	117	unsigned long cache_validity; /* bit mask */
1da177e4 LT	118
1da177e4 LT	119	/*
24bd68f4	120	* read_cache_jiffies is when we started read-caching this inode.
1da177e4 LT	121	* attrtimeo is for how long the cached information is assumed
	122	* to be valid. A successful attribute revalidation doubles
	123	* attrtimeo (up to acregmax/acdirmax), a failure resets it to
	124	* acregmin/acdirmin.
	125	*
	126	* We need to revalidate the cached attrs for this inode if
	127	*
	128	* jiffies - read_cache_jiffies > attrtimeo
1da177e4	129	*/
1da177e4 LT	130	unsigned long read_cache_jiffies;
	131	unsigned long attrtimeo;
	132	unsigned long attrtimeo_timestamp;
	133	__u64 change_attr; /* v4 only */
	134
33801147	135	unsigned long last_updated;
1da177e4 LT	136	/* "Generation counter" for the attribute cache. This is
	137	* bumped whenever we update the metadata on the
	138	* server.
	139	*/
	140	unsigned long cache_change_attribute;
	141	/*
	142	* Counter indicating the number of outstanding requests that
	143	* will cause a file data update.
	144	*/
	145	atomic_t data_updates;
	146
	147	struct nfs_access_entry cache_access;
5c6a9f7d AG	148	#ifdef CONFIG_NFS_V3_ACL
	149	struct posix_acl *acl_access;
	150	struct posix_acl *acl_default;
	151	#endif
1da177e4 LT	152
	153	/*
	154	* This is the cookie verifier used for NFSv3 readdir
	155	* operations
	156	*/
	157	__u32 cookieverf[2];
	158
	159	/*
	160	* This is the list of dirty unwritten pages.
	161	*/
	162	spinlock_t req_lock;
	163	struct list_head dirty;
	164	struct list_head commit;
	165	struct radix_tree_root nfs_page_tree;
	166
	167	unsigned int ndirty,
	168	ncommit,
	169	npages;
	170
	171	/* Open contexts for shared mmap writes */
	172	struct list_head open_files;
	173
1da177e4	174	#ifdef CONFIG_NFS_V4
e50a1c2e	175	struct nfs4_cached_acl *nfs4_acl;
1da177e4 LT	176	/* NFSv4 state */
	177	struct list_head open_states;
	178	struct nfs_delegation *delegation;
	179	int delegation_state;
	180	struct rw_semaphore rwsem;
	181	#endif /* CONFIG_NFS_V4*/
1da177e4 LT	182	struct inode vfs_inode;
	183	};
	184
	185	/*
55296809	186	* Cache validity bit flags
1da177e4	187	*/
55296809 CL	188	#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
	189	#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
	190	#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
	191	#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
	192	#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
	193	#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
	194
	195	/*
412d582e	196	* Bit offsets in flags field
55296809	197	*/
412d582e CL	198	#define NFS_INO_REVALIDATING (0) /* revalidating attrs */
	199	#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
	200	#define NFS_INO_STALE (2) /* possible stale inode */
1da177e4 LT	201
	202	static inline struct nfs_inode NFS_I(struct inode inode)
	203	{
	204	return container_of(inode, struct nfs_inode, vfs_inode);
	205	}
	206	#define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
	207
	208	#define NFS_FH(inode) (&NFS_I(inode)->fh)
	209	#define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
	210	#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
	211	#define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
	212	#define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
	213	#define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
	214	#define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
	215	#define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
	216	#define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
	217	#define NFS_MINATTRTIMEO(inode) \
	218	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
	219	: NFS_SERVER(inode)->acregmin)
	220	#define NFS_MAXATTRTIMEO(inode) \
	221	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
	222	: NFS_SERVER(inode)->acregmax)
	223	#define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
	224
	225	#define NFS_FLAGS(inode) (NFS_I(inode)->flags)
412d582e	226	#define NFS_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
1da177e4 LT	227
	228	#define NFS_FILEID(inode) (NFS_I(inode)->fileid)
	229
	230	static inline int nfs_caches_unstable(struct inode *inode)
	231	{
	232	return atomic_read(&NFS_I(inode)->data_updates) != 0;
	233	}
	234
decf491f TM	235	static inline void nfs_mark_for_revalidate(struct inode *inode)
	236	{
	237	spin_lock(&inode->i_lock);
	238	NFS_I(inode)->cache_validity \|= NFS_INO_INVALID_ATTR \| NFS_INO_INVALID_ACCESS;
	239	spin_unlock(&inode->i_lock);
	240	}
	241
1da177e4 LT	242	static inline void NFS_CACHEINV(struct inode *inode)
1da177e4 LT	243	{
decf491f TM	244	if (!nfs_caches_unstable(inode))
decf491f TM	245	nfs_mark_for_revalidate(inode);
1da177e4 LT	246	}
	247
	248	static inline int nfs_server_capable(struct inode *inode, int cap)
	249	{
	250	return NFS_SERVER(inode)->caps & cap;
	251	}
	252
	253	static inline int NFS_USE_READDIRPLUS(struct inode *inode)
	254	{
412d582e	255	return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
1da177e4 LT	256	}
	257
	258	/**
	259	* nfs_save_change_attribute - Returns the inode attribute change cookie
	260	* @inode - pointer to inode
	261	* The "change attribute" is updated every time we finish an operation
	262	* that will result in a metadata change on the server.
	263	*/
	264	static inline long nfs_save_change_attribute(struct inode *inode)
	265	{
	266	return NFS_I(inode)->cache_change_attribute;
	267	}
	268
	269	/**
	270	* nfs_verify_change_attribute - Detects NFS inode cache updates
	271	* @inode - pointer to inode
	272	* @chattr - previously saved change attribute
	273	* Return "false" if metadata has been updated (or is in the process of
	274	* being updated) since the change attribute was saved.
	275	*/
	276	static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
	277	{
	278	return !nfs_caches_unstable(inode)
913a70fc	279	&& time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
1da177e4 LT	280	}
	281
	282	/*
	283	* linux/fs/nfs/inode.c
	284	*/
29884df0	285	extern int nfs_sync_mapping(struct address_space *mapping);
1da177e4 LT	286	extern void nfs_zap_caches(struct inode *);
	287	extern struct inode nfs_fhget(struct super_block , struct nfs_fh *,
	288	struct nfs_fattr *);
	289	extern int nfs_refresh_inode(struct inode , struct nfs_fattr );
decf491f	290	extern int nfs_post_op_update_inode(struct inode inode, struct nfs_fattr fattr);
1da177e4 LT	291	extern int nfs_getattr(struct vfsmount , struct dentry , struct kstat *);
	292	extern int nfs_permission(struct inode , int, struct nameidata );
	293	extern int nfs_access_get_cached(struct inode , struct rpc_cred , struct nfs_access_entry *);
	294	extern void nfs_access_add_cache(struct inode , struct nfs_access_entry );
	295	extern int nfs_open(struct inode , struct file );
	296	extern int nfs_release(struct inode , struct file );
	297	extern int nfs_attribute_timeout(struct inode *inode);
	298	extern int nfs_revalidate_inode(struct nfs_server server, struct inode inode);
	299	extern int __nfs_revalidate_inode(struct nfs_server , struct inode );
7d52e862	300	extern void nfs_revalidate_mapping(struct inode inode, struct address_space mapping);
1da177e4	301	extern int nfs_setattr(struct dentry , struct iattr );
65e4308d	302	extern void nfs_setattr_update_inode(struct inode inode, struct iattr attr);
1da177e4 LT	303	extern void nfs_begin_attr_update(struct inode *);
	304	extern void nfs_end_attr_update(struct inode *);
	305	extern void nfs_begin_data_update(struct inode *);
	306	extern void nfs_end_data_update(struct inode *);
1da177e4 LT	307	extern struct nfs_open_context get_nfs_open_context(struct nfs_open_context ctx);
1da177e4 LT	308	extern void put_nfs_open_context(struct nfs_open_context *ctx);
d530838b	309	extern struct nfs_open_context nfs_find_open_context(struct inode inode, struct rpc_cred *cred, int mode);
1da177e4 LT	310
	311	/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
	312	extern u32 root_nfs_parse_addr(char name); /__init*/
	313
0e574af1 TM	314	static inline void nfs_fattr_init(struct nfs_fattr *fattr)
	315	{
	316	fattr->valid = 0;
33801147	317	fattr->time_start = jiffies;
0e574af1 TM	318	}
0e574af1 TM	319
1da177e4 LT	320	/*
	321	* linux/fs/nfs/file.c
	322	*/
	323	extern struct inode_operations nfs_file_inode_operations;
b7fa0554 AG	324	#ifdef CONFIG_NFS_V3
	325	extern struct inode_operations nfs3_file_inode_operations;
	326	#endif /* CONFIG_NFS_V3 */
4b6f5d20	327	extern const struct file_operations nfs_file_operations;
1da177e4 LT	328	extern struct address_space_operations nfs_file_aops;
	329
	330	static inline struct rpc_cred nfs_file_cred(struct file file)
	331	{
	332	if (file != NULL) {
	333	struct nfs_open_context *ctx;
	334
	335	ctx = (struct nfs_open_context*)file->private_data;
	336	return ctx->cred;
	337	}
	338	return NULL;
	339	}
	340
b7fa0554 AG	341	/*
	342	* linux/fs/nfs/xattr.c
	343	*/
	344	#ifdef CONFIG_NFS_V3_ACL
	345	extern ssize_t nfs3_listxattr(struct dentry , char , size_t);
	346	extern ssize_t nfs3_getxattr(struct dentry , const char , void *, size_t);
	347	extern int nfs3_setxattr(struct dentry , const char ,
	348	const void *, size_t, int);
	349	extern int nfs3_removexattr (struct dentry , const char name);
	350	#else
	351	# define nfs3_listxattr NULL
	352	# define nfs3_getxattr NULL
	353	# define nfs3_setxattr NULL
	354	# define nfs3_removexattr NULL
	355	#endif
	356
1da177e4 LT	357	/*
	358	* linux/fs/nfs/direct.c
	359	*/
	360	extern ssize_t nfs_direct_IO(int, struct kiocb , const struct iovec , loff_t,
	361	unsigned long);
	362	extern ssize_t nfs_file_direct_read(struct kiocb iocb, char __user buf,
	363	size_t count, loff_t pos);
	364	extern ssize_t nfs_file_direct_write(struct kiocb iocb, const char __user buf,
	365	size_t count, loff_t pos);
	366
	367	/*
	368	* linux/fs/nfs/dir.c
	369	*/
	370	extern struct inode_operations nfs_dir_inode_operations;
b7fa0554 AG	371	#ifdef CONFIG_NFS_V3
	372	extern struct inode_operations nfs3_dir_inode_operations;
	373	#endif /* CONFIG_NFS_V3 */
4b6f5d20	374	extern const struct file_operations nfs_dir_operations;
1da177e4 LT	375	extern struct dentry_operations nfs_dentry_operations;
	376
	377	extern int nfs_instantiate(struct dentry dentry, struct nfs_fh fh, struct nfs_fattr *fattr);
	378
	379	/*
	380	* linux/fs/nfs/symlink.c
	381	*/
	382	extern struct inode_operations nfs_symlink_inode_operations;
	383
a72b4422 TM	384	/*
	385	* linux/fs/nfs/sysctl.c
	386	*/
	387	#ifdef CONFIG_SYSCTL
	388	extern int nfs_register_sysctl(void);
	389	extern void nfs_unregister_sysctl(void);
	390	#else
7fd105e7	391	#define nfs_register_sysctl() 0
a72b4422 TM	392	#define nfs_unregister_sysctl() do { } while(0)
	393	#endif
	394
1da177e4 LT	395	/*
	396	* linux/fs/nfs/unlink.c
	397	*/
	398	extern int nfs_async_unlink(struct dentry *);
	399	extern void nfs_complete_unlink(struct dentry *);
	400
	401	/*
	402	* linux/fs/nfs/write.c
	403	*/
	404	extern int nfs_writepage(struct page page, struct writeback_control wbc);
	405	extern int nfs_writepages(struct address_space , struct writeback_control );
	406	extern int nfs_flush_incompatible(struct file file, struct page page);
	407	extern int nfs_updatepage(struct file , struct page , unsigned int, unsigned int);
462d5b32 CL	408	extern int nfs_writeback_done(struct rpc_task , struct nfs_write_data );
462d5b32 CL	409	extern void nfs_writedata_release(void *);
1da177e4	410
e17b1fc4 TM	411	#if defined(CONFIG_NFS_V3) \|\| defined(CONFIG_NFS_V4)
	412	struct nfs_write_data *nfs_commit_alloc(unsigned int pagecount);
	413	void nfs_commit_free(struct nfs_write_data *p);
	414	#endif
	415
1da177e4 LT	416	/*
	417	* Try to write back everything synchronously (but check the
	418	* return value!)
	419	*/
c42de9dd	420	extern int nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
1da177e4	421	#if defined(CONFIG_NFS_V3) \|\| defined(CONFIG_NFS_V4)
3da28eb1	422	extern int nfs_commit_inode(struct inode *, int);
fad61490	423	extern void nfs_commit_release(void *wdata);
1da177e4 LT	424	#else
1da177e4 LT	425	static inline int
3da28eb1	426	nfs_commit_inode(struct inode *inode, int how)
1da177e4 LT	427	{
	428	return 0;
	429	}
	430	#endif
	431
	432	static inline int
	433	nfs_have_writebacks(struct inode *inode)
	434	{
	435	return NFS_I(inode)->npages != 0;
	436	}
	437
	438	static inline int
	439	nfs_wb_all(struct inode *inode)
	440	{
c42de9dd	441	int error = nfs_sync_inode_wait(inode, 0, 0, 0);
1da177e4 LT	442	return (error < 0) ? error : 0;
	443	}
	444
	445	/*
	446	* Write back all requests on one page - we do this before reading it.
	447	*/
	448	static inline int nfs_wb_page_priority(struct inode inode, struct page page, int how)
	449	{
c42de9dd TM	450	int error = nfs_sync_inode_wait(inode, page->index, 1,
c42de9dd TM	451	how \| FLUSH_STABLE);
1da177e4 LT	452	return (error < 0) ? error : 0;
	453	}
	454
	455	static inline int nfs_wb_page(struct inode inode, struct page page)
	456	{
	457	return nfs_wb_page_priority(inode, page, 0);
	458	}
	459
	460	/*
	461	* Allocate and free nfs_write_data structures
	462	*/
3feb2d49 TM	463	extern struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount);
3feb2d49 TM	464	extern void nfs_writedata_free(struct nfs_write_data *p);
1da177e4	465
1da177e4 LT	466	/*
	467	* linux/fs/nfs/read.c
	468	*/
	469	extern int nfs_readpage(struct file , struct page );
	470	extern int nfs_readpages(struct file , struct address_space ,
	471	struct list_head *, unsigned);
ec06c096 TM	472	extern int nfs_readpage_result(struct rpc_task , struct nfs_read_data );
ec06c096 TM	473	extern void nfs_readdata_release(void *data);
963d8fe5	474
1da177e4 LT	475	/*
	476	* Allocate and free nfs_read_data structures
	477	*/
3feb2d49 TM	478	extern struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount);
3feb2d49 TM	479	extern void nfs_readdata_free(struct nfs_read_data *p);
1da177e4	480
b7fa0554 AG	481	/*
	482	* linux/fs/nfs3proc.c
	483	*/
	484	#ifdef CONFIG_NFS_V3_ACL
	485	extern struct posix_acl nfs3_proc_getacl(struct inode inode, int type);
	486	extern int nfs3_proc_setacl(struct inode *inode, int type,
	487	struct posix_acl *acl);
055ffbea AG	488	extern int nfs3_proc_set_default_acl(struct inode dir, struct inode inode,
055ffbea AG	489	mode_t mode);
5c6a9f7d	490	extern void nfs3_forget_cached_acls(struct inode *inode);
055ffbea AG	491	#else
	492	static inline int nfs3_proc_set_default_acl(struct inode *dir,
	493	struct inode *inode,
	494	mode_t mode)
	495	{
	496	return 0;
	497	}
5c6a9f7d AG	498
	499	static inline void nfs3_forget_cached_acls(struct inode *inode)
	500	{
	501	}
b7fa0554 AG	502	#endif /* CONFIG_NFS_V3_ACL */
b7fa0554 AG	503
1da177e4 LT	504	/*
	505	* linux/fs/mount_clnt.c
	506	* (Used only by nfsroot module)
	507	*/
	508	extern int nfsroot_mount(struct sockaddr_in , char , struct nfs_fh *,
	509	int, int);
	510
	511	/*
	512	* inline functions
	513	*/
	514
	515	static inline loff_t
	516	nfs_size_to_loff_t(__u64 size)
	517	{
	518	loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
	519	if (size > maxsz)
	520	return maxsz;
	521	return (loff_t) size;
	522	}
	523
	524	static inline ino_t
	525	nfs_fileid_to_ino_t(u64 fileid)
	526	{
	527	ino_t ino = (ino_t) fileid;
	528	if (sizeof(ino_t) < sizeof(u64))
	529	ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
	530	return ino;
	531	}
	532
	533	/* NFS root */
	534
	535	extern void * nfs_root_data(void);
	536
	537	#define nfs_wait_event(clnt, wq, condition) \
	538	({ \
	539	int __retval = 0; \
	540	if (clnt->cl_intr) { \
	541	sigset_t oldmask; \
	542	rpc_clnt_sigmask(clnt, &oldmask); \
	543	__retval = wait_event_interruptible(wq, condition); \
	544	rpc_clnt_sigunmask(clnt, &oldmask); \
	545	} else \
	546	wait_event(wq, condition); \
	547	__retval; \
	548	})
	549
	550	#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
	551
1da177e4 LT	552	#endif /* __KERNEL__ */
	553
	554	/*
	555	* NFS debug flags
	556	*/
	557	#define NFSDBG_VFS 0x0001
	558	#define NFSDBG_DIRCACHE 0x0002
	559	#define NFSDBG_LOOKUPCACHE 0x0004
	560	#define NFSDBG_PAGECACHE 0x0008
	561	#define NFSDBG_PROC 0x0010
	562	#define NFSDBG_XDR 0x0020
	563	#define NFSDBG_FILE 0x0040
	564	#define NFSDBG_ROOT 0x0080
	565	#define NFSDBG_CALLBACK 0x0100
	566	#define NFSDBG_ALL 0xFFFF
	567
	568	#ifdef __KERNEL__
	569	# undef ifdebug
	570	# ifdef NFS_DEBUG
	571	# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
	572	# else
	573	# define ifdebug(fac) if (0)
	574	# endif
	575	#endif /* __KERNEL */
	576
	577	#endif