[deliverable/linux.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/magic.h>

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

/*
 * 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 */
#define FLUSH_INVALIDATE	64	/* Invalidate the page cache */
#define FLUSH_NOWRITEPAGE	128	/* Don't call writepage() */

#ifdef __KERNEL__

#include <linux/in.h>
#include <linux/kref.h>
#include <linux/mm.h>
#include <linux/namei.h>
#include <linux/pagemap.h>
#include <linux/rbtree.h>
#include <linux/rwsem.h>
#include <linux/wait.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/nfs_fs_sb.h>

#include <linux/rwsem.h>
#include <linux/mempool.h>

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

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

struct nfs4_state;
struct nfs_open_context {
	atomic_t count;
	struct path path;
	struct rpc_cred *cred;
	struct nfs4_state *state;
	fl_owner_t lockowner;
	int mode;

	unsigned long flags;
#define NFS_CONTEXT_ERROR_WRITE		(0)
	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 rb_root		access_cache;
	struct list_head	access_cache_entry_lru;
	struct list_head	access_cache_inode_lru;
#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
	 */
	__be32			cookieverf[2];

	/*
	 * This is the list of dirty unwritten pages.
	 */
	struct radix_tree_root	nfs_page_tree;

	unsigned long		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 */
#define NFS_INO_REVAL_FORCED	0x0040		/* force revalidation ignoring a delegation */

/*
 * 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 */
#define NFS_INO_ACL_LRU_SET	(3)		/* Inode is on the LRU list */

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)->nfs_client->rpc_ops)
#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)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	spin_lock(&inode->i_lock);
	nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
	if (S_ISDIR(inode->i_mode)) {
		nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
		nfsi->cache_change_attribute = jiffies;
	}
	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)
		&& 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_mapping(struct inode *inode, struct address_space *mapping);
extern void nfs_zap_caches(struct inode *);
extern void nfs_invalidate_atime(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_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 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
extern int nfs_revalidate_mapping_nolock(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 __be32 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 const struct inode_operations nfs_file_inode_operations;
#ifdef CONFIG_NFS_V3
extern const struct inode_operations nfs3_file_inode_operations;
#endif /* CONFIG_NFS_V3 */
extern const struct file_operations nfs_file_operations;
extern const struct address_space_operations nfs_file_aops;

static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
{
	return filp->private_data;
}

static inline struct rpc_cred *nfs_file_cred(struct file *file)
{
	if (file != NULL)
		return nfs_file_open_context(file)->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,
			const struct iovec *iov, unsigned long nr_segs,
			loff_t pos);
extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
			const struct iovec *iov, unsigned long nr_segs,
			loff_t pos);

/*
 * linux/fs/nfs/dir.c
 */
extern const struct inode_operations nfs_dir_inode_operations;
#ifdef CONFIG_NFS_V3
extern const 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);
extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
extern void nfs_access_zap_cache(struct inode *inode);

/*
 * linux/fs/nfs/symlink.c
 */
extern const 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/namespace.c
 */
extern struct list_head nfs_automount_list;
extern const struct inode_operations nfs_mountpoint_inode_operations;
extern const struct inode_operations nfs_referral_inode_operations;
extern int nfs_mountpoint_expiry_timeout;
extern void nfs_release_automount_timer(void);

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

/*
 * linux/fs/nfs/write.c
 */
extern int  nfs_congestion_kb;
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 *);

/*
 * Try to write back everything synchronously (but check the
 * return value!)
 */
extern long nfs_sync_mapping_wait(struct address_space *, struct writeback_control *, int);
extern int nfs_wb_all(struct inode *inode);
extern int nfs_wb_nocommit(struct inode *inode);
extern int nfs_wb_page(struct inode *inode, struct page* page);
extern int nfs_wb_page_priority(struct inode *inode, struct page* page, int how);
extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int  nfs_commit_inode(struct inode *, int);
extern struct nfs_write_data *nfs_commit_alloc(void);
extern void nfs_commit_free(struct nfs_write_data *wdata);
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;
}

/*
 * Allocate nfs_write_data structures
 */
extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);

/*
 * 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 nfs_read_data structures
 */
extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);

/*
 * 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
 */
extern int  nfs_mount(struct sockaddr *, size_t, char *, char *,
		      int, int, struct nfs_fh *);

/*
 * inline functions
 */

static inline loff_t nfs_size_to_loff_t(__u64 size)
{
	if (size > (__u64) OFFSET_MAX - 1)
		return OFFSET_MAX - 1;
	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_CLIENT		0x0200
#define NFSDBG_MOUNT		0x0400
#define NFSDBG_ALL		0xFFFF

#ifdef __KERNEL__

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

# 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
e18fa700 JG	12	#include <linux/magic.h>
e18fa700 JG	13
03bf4b70 CL	14	/* Default timeout values */
	15	#define NFS_MAX_UDP_TIMEOUT (60*HZ)
	16	#define NFS_MAX_TCP_TIMEOUT (600*HZ)
	17
1da177e4 LT	18	/*
	19	* When flushing a cluster of dirty pages, there can be different
	20	* strategies:
	21	*/
1da177e4	22	#define FLUSH_SYNC 1 /* file being synced, or contention */
1da177e4 LT	23	#define FLUSH_STABLE 4 /* commit to stable storage */
	24	#define FLUSH_LOWPRI 8 /* low priority background flush */
	25	#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
70b9ecbd	26	#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
d2ccddf0	27	#define FLUSH_INVALIDATE 64 /* Invalidate the page cache */
4d770ccf	28	#define FLUSH_NOWRITEPAGE 128 /* Don't call writepage() */
1da177e4 LT	29
	30	#ifdef __KERNEL__
	31
7f1cbe51	32	#include <linux/in.h>
3bec63db	33	#include <linux/kref.h>
7f1cbe51	34	#include <linux/mm.h>
88be9f99	35	#include <linux/namei.h>
7f1cbe51	36	#include <linux/pagemap.h>
1c3c07e9	37	#include <linux/rbtree.h>
7f1cbe51 DW	38	#include <linux/rwsem.h>
	39	#include <linux/wait.h>
	40
	41	#include <linux/sunrpc/debug.h>
	42	#include <linux/sunrpc/auth.h>
	43	#include <linux/sunrpc/clnt.h>
	44
	45	#include <linux/nfs.h>
	46	#include <linux/nfs2.h>
	47	#include <linux/nfs3.h>
	48	#include <linux/nfs4.h>
	49	#include <linux/nfs_xdr.h>
	50
	51	#include <linux/nfs_fs_sb.h>
	52
	53	#include <linux/rwsem.h>
	54	#include <linux/mempool.h>
	55
	56	/*
	57	* These are the default flags for swap requests
	58	*/
	59	#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER\|RPC_TASK_ROOTCREDS)
	60
1da177e4 LT	61	/*
	62	* NFSv3/v4 Access mode cache entry
	63	*/
	64	struct nfs_access_entry {
1c3c07e9	65	struct rb_node rb_node;
cfcea3e8	66	struct list_head lru;
1da177e4 LT	67	unsigned long jiffies;
	68	struct rpc_cred * cred;
	69	int mask;
	70	};
	71
	72	struct nfs4_state;
	73	struct nfs_open_context {
5e11934d	74	atomic_t count;
88be9f99	75	struct path path;
1da177e4 LT	76	struct rpc_cred *cred;
	77	struct nfs4_state *state;
	78	fl_owner_t lockowner;
	79	int mode;
7b159fc1 TM	80
	81	unsigned long flags;
	82	#define NFS_CONTEXT_ERROR_WRITE (0)
1da177e4 LT	83	int error;
	84
	85	struct list_head list;
00a92642	86
00a92642	87	__u64 dir_cookie;
1da177e4 LT	88	};
	89
	90	/*
	91	* NFSv4 delegation
	92	*/
	93	struct nfs_delegation;
	94
5c6a9f7d AG	95	struct posix_acl;
5c6a9f7d AG	96
1da177e4 LT	97	/*
	98	* nfs fs inode data in memory
	99	*/
	100	struct nfs_inode {
	101	/*
	102	* The 64bit 'inode number'
	103	*/
	104	__u64 fileid;
	105
	106	/*
	107	* NFS file handle
	108	*/
	109	struct nfs_fh fh;
	110
	111	/*
	112	* Various flags
	113	*/
412d582e CL	114	unsigned long flags; /* atomic bit ops */
412d582e CL	115	unsigned long cache_validity; /* bit mask */
1da177e4 LT	116
1da177e4 LT	117	/*
24bd68f4	118	* read_cache_jiffies is when we started read-caching this inode.
1da177e4 LT	119	* attrtimeo is for how long the cached information is assumed
	120	* to be valid. A successful attribute revalidation doubles
	121	* attrtimeo (up to acregmax/acdirmax), a failure resets it to
	122	* acregmin/acdirmin.
	123	*
	124	* We need to revalidate the cached attrs for this inode if
	125	*
	126	* jiffies - read_cache_jiffies > attrtimeo
1da177e4	127	*/
1da177e4 LT	128	unsigned long read_cache_jiffies;
	129	unsigned long attrtimeo;
	130	unsigned long attrtimeo_timestamp;
	131	__u64 change_attr; /* v4 only */
	132
33801147	133	unsigned long last_updated;
1da177e4 LT	134	/* "Generation counter" for the attribute cache. This is
	135	* bumped whenever we update the metadata on the
	136	* server.
	137	*/
	138	unsigned long cache_change_attribute;
	139	/*
	140	* Counter indicating the number of outstanding requests that
	141	* will cause a file data update.
	142	*/
	143	atomic_t data_updates;
	144
1c3c07e9	145	struct rb_root access_cache;
cfcea3e8 TM	146	struct list_head access_cache_entry_lru;
cfcea3e8 TM	147	struct list_head access_cache_inode_lru;
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	*/
bc4785cd	157	__be32 cookieverf[2];
1da177e4 LT	158
	159	/*
	160	* This is the list of dirty unwritten pages.
	161	*/
1da177e4 LT	162	struct radix_tree_root nfs_page_tree;
1da177e4 LT	163
dce34ce2	164	unsigned long ncommit,
1da177e4 LT	165	npages;
	166
	167	/* Open contexts for shared mmap writes */
	168	struct list_head open_files;
	169
1da177e4	170	#ifdef CONFIG_NFS_V4
e50a1c2e	171	struct nfs4_cached_acl *nfs4_acl;
1da177e4 LT	172	/* NFSv4 state */
	173	struct list_head open_states;
	174	struct nfs_delegation *delegation;
	175	int delegation_state;
	176	struct rw_semaphore rwsem;
	177	#endif /* CONFIG_NFS_V4*/
1da177e4 LT	178	struct inode vfs_inode;
	179	};
	180
	181	/*
55296809	182	* Cache validity bit flags
1da177e4	183	*/
55296809 CL	184	#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
	185	#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
	186	#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
	187	#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
	188	#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
	189	#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
412c77ce	190	#define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
55296809 CL	191
55296809 CL	192	/*
412d582e	193	* Bit offsets in flags field
55296809	194	*/
412d582e CL	195	#define NFS_INO_REVALIDATING (0) /* revalidating attrs */
	196	#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
	197	#define NFS_INO_STALE (2) /* possible stale inode */
cfcea3e8	198	#define NFS_INO_ACL_LRU_SET (3) /* Inode is on the LRU list */
1da177e4 LT	199
	200	static inline struct nfs_inode NFS_I(struct inode inode)
	201	{
	202	return container_of(inode, struct nfs_inode, vfs_inode);
	203	}
	204	#define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
	205
	206	#define NFS_FH(inode) (&NFS_I(inode)->fh)
	207	#define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
	208	#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
8fa5c000	209	#define NFS_PROTO(inode) (NFS_SERVER(inode)->nfs_client->rpc_ops)
1da177e4 LT	210	#define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
	211	#define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
	212	#define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
	213	#define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
	214	#define NFS_MINATTRTIMEO(inode) \
	215	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
	216	: NFS_SERVER(inode)->acregmin)
	217	#define NFS_MAXATTRTIMEO(inode) \
	218	(S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
	219	: NFS_SERVER(inode)->acregmax)
	220	#define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
	221
	222	#define NFS_FLAGS(inode) (NFS_I(inode)->flags)
412d582e	223	#define NFS_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
1da177e4 LT	224
	225	#define NFS_FILEID(inode) (NFS_I(inode)->fileid)
	226
	227	static inline int nfs_caches_unstable(struct inode *inode)
	228	{
	229	return atomic_read(&NFS_I(inode)->data_updates) != 0;
	230	}
	231
decf491f TM	232	static inline void nfs_mark_for_revalidate(struct inode *inode)
decf491f TM	233	{
38478b24 TM	234	struct nfs_inode *nfsi = NFS_I(inode);
38478b24 TM	235
decf491f	236	spin_lock(&inode->i_lock);
38478b24	237	nfsi->cache_validity \|= NFS_INO_INVALID_ATTR\|NFS_INO_INVALID_ACCESS;
17cadc95	238	if (S_ISDIR(inode->i_mode)) {
38478b24	239	nfsi->cache_validity \|= NFS_INO_REVAL_PAGECACHE\|NFS_INO_INVALID_DATA;
17cadc95 TM	240	nfsi->cache_change_attribute = jiffies;
17cadc95 TM	241	}
decf491f TM	242	spin_unlock(&inode->i_lock);
	243	}
	244
1da177e4 LT	245	static inline void NFS_CACHEINV(struct inode *inode)
1da177e4 LT	246	{
decf491f TM	247	if (!nfs_caches_unstable(inode))
decf491f TM	248	nfs_mark_for_revalidate(inode);
1da177e4 LT	249	}
	250
	251	static inline int nfs_server_capable(struct inode *inode, int cap)
	252	{
	253	return NFS_SERVER(inode)->caps & cap;
	254	}
	255
	256	static inline int NFS_USE_READDIRPLUS(struct inode *inode)
	257	{
412d582e	258	return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
1da177e4 LT	259	}
	260
	261	/**
	262	* nfs_save_change_attribute - Returns the inode attribute change cookie
	263	* @inode - pointer to inode
	264	* The "change attribute" is updated every time we finish an operation
	265	* that will result in a metadata change on the server.
	266	*/
	267	static inline long nfs_save_change_attribute(struct inode *inode)
	268	{
	269	return NFS_I(inode)->cache_change_attribute;
	270	}
	271
	272	/**
	273	* nfs_verify_change_attribute - Detects NFS inode cache updates
	274	* @inode - pointer to inode
	275	* @chattr - previously saved change attribute
	276	* Return "false" if metadata has been updated (or is in the process of
	277	* being updated) since the change attribute was saved.
	278	*/
	279	static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
	280	{
	281	return !nfs_caches_unstable(inode)
7957c141	282	&& chattr == NFS_I(inode)->cache_change_attribute;
1da177e4 LT	283	}
	284
	285	/*
	286	* linux/fs/nfs/inode.c
	287	*/
29884df0	288	extern int nfs_sync_mapping(struct address_space *mapping);
cd9ae2b6	289	extern void nfs_zap_mapping(struct inode inode, struct address_space mapping);
1da177e4	290	extern void nfs_zap_caches(struct inode *);
c4812998	291	extern void nfs_invalidate_atime(struct inode *);
1da177e4 LT	292	extern struct inode nfs_fhget(struct super_block , struct nfs_fh *,
	293	struct nfs_fattr *);
	294	extern int nfs_refresh_inode(struct inode , struct nfs_fattr );
decf491f	295	extern int nfs_post_op_update_inode(struct inode inode, struct nfs_fattr fattr);
1da177e4 LT	296	extern int nfs_getattr(struct vfsmount , struct dentry , struct kstat *);
1da177e4 LT	297	extern int nfs_permission(struct inode , int, struct nameidata );
1da177e4 LT	298	extern int nfs_open(struct inode , struct file );
	299	extern int nfs_release(struct inode , struct file );
	300	extern int nfs_attribute_timeout(struct inode *inode);
	301	extern int nfs_revalidate_inode(struct nfs_server server, struct inode inode);
	302	extern int __nfs_revalidate_inode(struct nfs_server , struct inode );
44b11874	303	extern int nfs_revalidate_mapping(struct inode inode, struct address_space mapping);
717d44e8	304	extern int nfs_revalidate_mapping_nolock(struct inode inode, struct address_space mapping);
1da177e4	305	extern int nfs_setattr(struct dentry , struct iattr );
65e4308d	306	extern void nfs_setattr_update_inode(struct inode inode, struct iattr attr);
1da177e4 LT	307	extern void nfs_begin_attr_update(struct inode *);
	308	extern void nfs_end_attr_update(struct inode *);
	309	extern void nfs_begin_data_update(struct inode *);
	310	extern void nfs_end_data_update(struct inode *);
1da177e4 LT	311	extern struct nfs_open_context get_nfs_open_context(struct nfs_open_context ctx);
1da177e4 LT	312	extern void put_nfs_open_context(struct nfs_open_context *ctx);
d530838b	313	extern struct nfs_open_context nfs_find_open_context(struct inode inode, struct rpc_cred *cred, int mode);
1da177e4 LT	314
1da177e4 LT	315	/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
5a874db4	316	extern __be32 root_nfs_parse_addr(char name); /__init*/
1da177e4	317
0e574af1 TM	318	static inline void nfs_fattr_init(struct nfs_fattr *fattr)
	319	{
	320	fattr->valid = 0;
33801147	321	fattr->time_start = jiffies;
0e574af1 TM	322	}
0e574af1 TM	323
1da177e4 LT	324	/*
	325	* linux/fs/nfs/file.c
	326	*/
c5ef1c42	327	extern const struct inode_operations nfs_file_inode_operations;
b7fa0554	328	#ifdef CONFIG_NFS_V3
c5ef1c42	329	extern const struct inode_operations nfs3_file_inode_operations;
b7fa0554	330	#endif /* CONFIG_NFS_V3 */
4b6f5d20	331	extern const struct file_operations nfs_file_operations;
f5e54d6e	332	extern const struct address_space_operations nfs_file_aops;
1da177e4	333
c03025d5 TM	334	static inline struct nfs_open_context nfs_file_open_context(struct file filp)
	335	{
	336	return filp->private_data;
	337	}
	338
1da177e4 LT	339	static inline struct rpc_cred nfs_file_cred(struct file file)
1da177e4 LT	340	{
cd3758e3 TM	341	if (file != NULL)
cd3758e3 TM	342	return nfs_file_open_context(file)->cred;
1da177e4 LT	343	return NULL;
	344	}
	345
b7fa0554 AG	346	/*
	347	* linux/fs/nfs/xattr.c
	348	*/
	349	#ifdef CONFIG_NFS_V3_ACL
	350	extern ssize_t nfs3_listxattr(struct dentry , char , size_t);
	351	extern ssize_t nfs3_getxattr(struct dentry , const char , void *, size_t);
	352	extern int nfs3_setxattr(struct dentry , const char ,
	353	const void *, size_t, int);
	354	extern int nfs3_removexattr (struct dentry , const char name);
	355	#else
	356	# define nfs3_listxattr NULL
	357	# define nfs3_getxattr NULL
	358	# define nfs3_setxattr NULL
	359	# define nfs3_removexattr NULL
	360	#endif
	361
1da177e4 LT	362	/*
	363	* linux/fs/nfs/direct.c
	364	*/
	365	extern ssize_t nfs_direct_IO(int, struct kiocb , const struct iovec , loff_t,
	366	unsigned long);
027445c3 BP	367	extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
	368	const struct iovec *iov, unsigned long nr_segs,
	369	loff_t pos);
	370	extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
	371	const struct iovec *iov, unsigned long nr_segs,
	372	loff_t pos);
1da177e4 LT	373
	374	/*
	375	* linux/fs/nfs/dir.c
	376	*/
c5ef1c42	377	extern const struct inode_operations nfs_dir_inode_operations;
b7fa0554	378	#ifdef CONFIG_NFS_V3
c5ef1c42	379	extern const struct inode_operations nfs3_dir_inode_operations;
b7fa0554	380	#endif /* CONFIG_NFS_V3 */
4b6f5d20	381	extern const struct file_operations nfs_dir_operations;
1da177e4 LT	382	extern struct dentry_operations nfs_dentry_operations;
	383
	384	extern int nfs_instantiate(struct dentry dentry, struct nfs_fh fh, struct nfs_fattr *fattr);
af22f94a TM	385	extern int nfs_may_open(struct inode inode, struct rpc_cred cred, int openflags);
af22f94a TM	386	extern void nfs_access_zap_cache(struct inode *inode);
1da177e4 LT	387
	388	/*
	389	* linux/fs/nfs/symlink.c
	390	*/
c5ef1c42	391	extern const struct inode_operations nfs_symlink_inode_operations;
1da177e4	392
a72b4422 TM	393	/*
	394	* linux/fs/nfs/sysctl.c
	395	*/
	396	#ifdef CONFIG_SYSCTL
	397	extern int nfs_register_sysctl(void);
	398	extern void nfs_unregister_sysctl(void);
	399	#else
7fd105e7	400	#define nfs_register_sysctl() 0
a72b4422 TM	401	#define nfs_unregister_sysctl() do { } while(0)
	402	#endif
	403
55a97593 TM	404	/*
	405	* linux/fs/nfs/namespace.c
	406	*/
51d8fa6a	407	extern struct list_head nfs_automount_list;
c5ef1c42 AV	408	extern const struct inode_operations nfs_mountpoint_inode_operations;
c5ef1c42 AV	409	extern const struct inode_operations nfs_referral_inode_operations;
51d8fa6a TM	410	extern int nfs_mountpoint_expiry_timeout;
51d8fa6a TM	411	extern void nfs_release_automount_timer(void);
55a97593	412
1da177e4 LT	413	/*
	414	* linux/fs/nfs/unlink.c
	415	*/
e4eff1a6 TM	416	extern int nfs_async_unlink(struct inode dir, struct dentry dentry);
e4eff1a6 TM	417	extern void nfs_complete_unlink(struct dentry dentry, struct inode );
1da177e4 LT	418
	419	/*
	420	* linux/fs/nfs/write.c
	421	*/
89a09141	422	extern int nfs_congestion_kb;
1da177e4 LT	423	extern int nfs_writepage(struct page page, struct writeback_control wbc);
	424	extern int nfs_writepages(struct address_space , struct writeback_control );
	425	extern int nfs_flush_incompatible(struct file file, struct page page);
	426	extern int nfs_updatepage(struct file , struct page , unsigned int, unsigned int);
462d5b32 CL	427	extern int nfs_writeback_done(struct rpc_task , struct nfs_write_data );
462d5b32 CL	428	extern void nfs_writedata_release(void *);
1da177e4 LT	429
	430	/*
	431	* Try to write back everything synchronously (but check the
	432	* return value!)
	433	*/
1c75950b	434	extern long nfs_sync_mapping_wait(struct address_space , struct writeback_control , int);
1c75950b	435	extern int nfs_wb_all(struct inode *inode);
ed90ef51	436	extern int nfs_wb_nocommit(struct inode *inode);
1c75950b	437	extern int nfs_wb_page(struct inode inode, struct page page);
61822ab5	438	extern int nfs_wb_page_priority(struct inode inode, struct page page, int how);
1b3b4a1a	439	extern int nfs_wb_page_cancel(struct inode inode, struct page page);
1da177e4	440	#if defined(CONFIG_NFS_V3) \|\| defined(CONFIG_NFS_V4)
3da28eb1	441	extern int nfs_commit_inode(struct inode *, int);
8aca67f0 TM	442	extern struct nfs_write_data *nfs_commit_alloc(void);
8aca67f0 TM	443	extern void nfs_commit_free(struct nfs_write_data *wdata);
fad61490	444	extern void nfs_commit_release(void *wdata);
1da177e4 LT	445	#else
1da177e4 LT	446	static inline int
3da28eb1	447	nfs_commit_inode(struct inode *inode, int how)
1da177e4 LT	448	{
	449	return 0;
	450	}
	451	#endif
	452
	453	static inline int
	454	nfs_have_writebacks(struct inode *inode)
	455	{
	456	return NFS_I(inode)->npages != 0;
	457	}
	458
1da177e4	459	/*
e4e20512	460	* Allocate nfs_write_data structures
1da177e4	461	*/
8d5658c9	462	extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
1da177e4	463
1da177e4 LT	464	/*
	465	* linux/fs/nfs/read.c
	466	*/
	467	extern int nfs_readpage(struct file , struct page );
	468	extern int nfs_readpages(struct file , struct address_space ,
	469	struct list_head *, unsigned);
ec06c096 TM	470	extern int nfs_readpage_result(struct rpc_task , struct nfs_read_data );
ec06c096 TM	471	extern void nfs_readdata_release(void *data);
963d8fe5	472
1da177e4	473	/*
e4e20512	474	* Allocate nfs_read_data structures
1da177e4	475	*/
8d5658c9	476	extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
1da177e4	477
b7fa0554 AG	478	/*
	479	* linux/fs/nfs3proc.c
	480	*/
	481	#ifdef CONFIG_NFS_V3_ACL
	482	extern struct posix_acl nfs3_proc_getacl(struct inode inode, int type);
	483	extern int nfs3_proc_setacl(struct inode *inode, int type,
	484	struct posix_acl *acl);
055ffbea AG	485	extern int nfs3_proc_set_default_acl(struct inode dir, struct inode inode,
055ffbea AG	486	mode_t mode);
5c6a9f7d	487	extern void nfs3_forget_cached_acls(struct inode *inode);
055ffbea AG	488	#else
	489	static inline int nfs3_proc_set_default_acl(struct inode *dir,
	490	struct inode *inode,
	491	mode_t mode)
	492	{
	493	return 0;
	494	}
5c6a9f7d AG	495
	496	static inline void nfs3_forget_cached_acls(struct inode *inode)
	497	{
	498	}
b7fa0554 AG	499	#endif /* CONFIG_NFS_V3_ACL */
b7fa0554 AG	500
1da177e4 LT	501	/*
1da177e4 LT	502	* linux/fs/mount_clnt.c
1da177e4	503	*/
3ea97309 CL	504	extern int nfs_mount(struct sockaddr , size_t, char , char *,
3ea97309 CL	505	int, int, struct nfs_fh *);
1da177e4 LT	506
	507	/*
	508	* inline functions
	509	*/
	510
433c9237	511	static inline loff_t nfs_size_to_loff_t(__u64 size)
1da177e4	512	{
433c9237 CL	513	if (size > (__u64) OFFSET_MAX - 1)
433c9237 CL	514	return OFFSET_MAX - 1;
1da177e4 LT	515	return (loff_t) size;
	516	}
	517
	518	static inline ino_t
	519	nfs_fileid_to_ino_t(u64 fileid)
	520	{
	521	ino_t ino = (ino_t) fileid;
	522	if (sizeof(ino_t) < sizeof(u64))
	523	ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
	524	return ino;
	525	}
	526
	527	/* NFS root */
	528
	529	extern void * nfs_root_data(void);
	530
	531	#define nfs_wait_event(clnt, wq, condition) \
	532	({ \
	533	int __retval = 0; \
	534	if (clnt->cl_intr) { \
	535	sigset_t oldmask; \
	536	rpc_clnt_sigmask(clnt, &oldmask); \
	537	__retval = wait_event_interruptible(wq, condition); \
	538	rpc_clnt_sigunmask(clnt, &oldmask); \
	539	} else \
	540	wait_event(wq, condition); \
	541	__retval; \
	542	})
	543
	544	#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
	545
1da177e4 LT	546	#endif /* __KERNEL__ */
	547
	548	/*
	549	* NFS debug flags
	550	*/
	551	#define NFSDBG_VFS 0x0001
	552	#define NFSDBG_DIRCACHE 0x0002
	553	#define NFSDBG_LOOKUPCACHE 0x0004
	554	#define NFSDBG_PAGECACHE 0x0008
	555	#define NFSDBG_PROC 0x0010
	556	#define NFSDBG_XDR 0x0020
	557	#define NFSDBG_FILE 0x0040
	558	#define NFSDBG_ROOT 0x0080
	559	#define NFSDBG_CALLBACK 0x0100
24c8dbbb	560	#define NFSDBG_CLIENT 0x0200
f1828993	561	#define NFSDBG_MOUNT 0x0400
1da177e4 LT	562	#define NFSDBG_ALL 0xFFFF
	563
	564	#ifdef __KERNEL__
4dc2eaec BH	565
	566	/*
	567	* Enable debugging support for nfs client.
	568	* Requires RPC_DEBUG.
	569	*/
	570	#ifdef RPC_DEBUG
	571	# define NFS_DEBUG
	572	#endif
	573
1da177e4 LT	574	# undef ifdebug
	575	# ifdef NFS_DEBUG
	576	# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
	577	# else
	578	# define ifdebug(fac) if (0)
	579	# endif
	580	#endif /* __KERNEL */
	581
	582	#endif