[linux-block.git] / fs / nfs / internal.h

/*
 * NFS internal definitions
 */

#include "nfs4_fs.h"
#include <linux/mount.h>
#include <linux/security.h>

#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)

struct nfs_string;

/* Maximum number of readahead requests
 * FIXME: this should really be a sysctl so that users may tune it to suit
 *        their needs. People that do NFS over a slow network, might for
 *        instance want to reduce it to something closer to 1 for improved
 *        interactive response.
 */
#define NFS_MAX_READAHEAD	(RPC_DEF_SLOT_TABLE - 1)

/*
 * Determine if sessions are in use.
 */
static inline int nfs4_has_session(const struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4_1
	if (clp->cl_session)
		return 1;
#endif /* CONFIG_NFS_V4_1 */
	return 0;
}

static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4_1
	if (nfs4_has_session(clp))
		return (clp->cl_session->flags & SESSION4_PERSIST);
#endif /* CONFIG_NFS_V4_1 */
	return 0;
}

static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
{
	if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
		fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
}

static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
{
	if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
	    (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
	     ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
		return 0;

	fattr->fileid = fattr->mounted_on_fileid;
	return 1;
}

struct nfs_clone_mount {
	const struct super_block *sb;
	const struct dentry *dentry;
	struct nfs_fh *fh;
	struct nfs_fattr *fattr;
	char *hostname;
	char *mnt_path;
	struct sockaddr *addr;
	size_t addrlen;
	rpc_authflavor_t authflavor;
};

/*
 * Note: RFC 1813 doesn't limit the number of auth flavors that
 * a server can return, so make something up.
 */
#define NFS_MAX_SECFLAVORS	(12)

/*
 * Value used if the user did not specify a port value.
 */
#define NFS_UNSPEC_PORT		(-1)

/*
 * Maximum number of pages that readdir can use for creating
 * a vmapped array of pages.
 */
#define NFS_MAX_READDIR_PAGES 8

/*
 * In-kernel mount arguments
 */
struct nfs_parsed_mount_data {
	int			flags;
	int			rsize, wsize;
	int			timeo, retrans;
	int			acregmin, acregmax,
				acdirmin, acdirmax;
	int			namlen;
	unsigned int		options;
	unsigned int		bsize;
	unsigned int		auth_flavor_len;
	rpc_authflavor_t	auth_flavors[1];
	char			*client_address;
	unsigned int		version;
	unsigned int		minorversion;
	char			*fscache_uniq;

	struct {
		struct sockaddr_storage	address;
		size_t			addrlen;
		char			*hostname;
		u32			version;
		int			port;
		unsigned short		protocol;
	} mount_server;

	struct {
		struct sockaddr_storage	address;
		size_t			addrlen;
		char			*hostname;
		char			*export_path;
		int			port;
		unsigned short		protocol;
	} nfs_server;

	struct security_mnt_opts lsm_opts;
};

/* mount_clnt.c */
struct nfs_mount_request {
	struct sockaddr		*sap;
	size_t			salen;
	char			*hostname;
	char			*dirpath;
	u32			version;
	unsigned short		protocol;
	struct nfs_fh		*fh;
	int			noresvport;
	unsigned int		*auth_flav_len;
	rpc_authflavor_t	*auth_flavs;
};

extern int nfs_mount(struct nfs_mount_request *info);
extern void nfs_umount(const struct nfs_mount_request *info);

/* client.c */
extern struct rpc_program nfs_program;

extern void nfs_cleanup_cb_ident_idr(void);
extern void nfs_put_client(struct nfs_client *);
extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
extern struct nfs_client *nfs4_find_client_ident(int);
extern struct nfs_client *
nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
extern struct nfs_server *nfs_create_server(
					const struct nfs_parsed_mount_data *,
					struct nfs_fh *);
extern struct nfs_server *nfs4_create_server(
					const struct nfs_parsed_mount_data *,
					struct nfs_fh *);
extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
						      struct nfs_fh *);
extern void nfs_free_server(struct nfs_server *server);
extern struct nfs_server *nfs_clone_server(struct nfs_server *,
					   struct nfs_fh *,
					   struct nfs_fattr *);
extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
extern int nfs4_check_client_ready(struct nfs_client *clp);
extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
					     const struct sockaddr *ds_addr,
					     int ds_addrlen, int ds_proto);
#ifdef CONFIG_PROC_FS
extern int __init nfs_fs_proc_init(void);
extern void nfs_fs_proc_exit(void);
#else
static inline int nfs_fs_proc_init(void)
{
	return 0;
}
static inline void nfs_fs_proc_exit(void)
{
}
#endif

/* nfs4namespace.c */
#ifdef CONFIG_NFS_V4
extern struct vfsmount *nfs_do_refmount(struct dentry *dentry);
#else
static inline
struct vfsmount *nfs_do_refmount(struct dentry *dentry)
{
	return ERR_PTR(-ENOENT);
}
#endif

/* callback_xdr.c */
extern struct svc_version nfs4_callback_version1;
extern struct svc_version nfs4_callback_version4;

/* pagelist.c */
extern int __init nfs_init_nfspagecache(void);
extern void nfs_destroy_nfspagecache(void);
extern int __init nfs_init_readpagecache(void);
extern void nfs_destroy_readpagecache(void);
extern int __init nfs_init_writepagecache(void);
extern void nfs_destroy_writepagecache(void);

extern int __init nfs_init_directcache(void);
extern void nfs_destroy_directcache(void);

/* nfs2xdr.c */
extern int nfs_stat_to_errno(enum nfs_stat);
extern struct rpc_procinfo nfs_procedures[];
extern int nfs2_decode_dirent(struct xdr_stream *,
				struct nfs_entry *, int);

/* nfs3xdr.c */
extern struct rpc_procinfo nfs3_procedures[];
extern int nfs3_decode_dirent(struct xdr_stream *,
				struct nfs_entry *, int);

/* nfs4xdr.c */
#ifdef CONFIG_NFS_V4
extern int nfs4_decode_dirent(struct xdr_stream *,
				struct nfs_entry *, int);
#endif
#ifdef CONFIG_NFS_V4_1
extern const u32 nfs41_maxread_overhead;
extern const u32 nfs41_maxwrite_overhead;
#endif

/* nfs4proc.c */
#ifdef CONFIG_NFS_V4
extern struct rpc_procinfo nfs4_procedures[];
void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *);
#endif

extern int nfs4_init_ds_session(struct nfs_client *clp);

/* proc.c */
void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
extern int nfs_init_client(struct nfs_client *clp,
			   const struct rpc_timeout *timeparms,
			   const char *ip_addr, rpc_authflavor_t authflavour,
			   int noresvport);

/* dir.c */
extern int nfs_access_cache_shrinker(struct shrinker *shrink,
					struct shrink_control *sc);

/* inode.c */
extern struct workqueue_struct *nfsiod_workqueue;
extern struct inode *nfs_alloc_inode(struct super_block *sb);
extern void nfs_destroy_inode(struct inode *);
extern int nfs_write_inode(struct inode *, struct writeback_control *);
extern void nfs_evict_inode(struct inode *);
#ifdef CONFIG_NFS_V4
extern void nfs4_evict_inode(struct inode *);
#endif
void nfs_zap_acl_cache(struct inode *inode);
extern int nfs_wait_bit_killable(void *word);

/* super.c */
extern struct file_system_type nfs_xdev_fs_type;
#ifdef CONFIG_NFS_V4
extern struct file_system_type nfs4_xdev_fs_type;
extern struct file_system_type nfs4_referral_fs_type;
#endif

extern struct rpc_stat nfs_rpcstat;

extern int __init register_nfs_fs(void);
extern void __exit unregister_nfs_fs(void);
extern void nfs_sb_active(struct super_block *sb);
extern void nfs_sb_deactive(struct super_block *sb);

/* namespace.c */
extern char *nfs_path(char **p, struct dentry *dentry,
		      char *buffer, ssize_t buflen);
extern struct vfsmount *nfs_d_automount(struct path *path);
#ifdef CONFIG_NFS_V4
rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
#endif

/* getroot.c */
extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
				   const char *);
#ifdef CONFIG_NFS_V4
extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
				    const char *);

extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
#endif

/* read.c */
extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
			     const struct rpc_call_ops *call_ops);
extern void nfs_read_prepare(struct rpc_task *task, void *calldata);

struct nfs_pageio_descriptor;
extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
		struct inode *inode);

/* write.c */
extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
				  struct inode *inode, int ioflags);
extern void nfs_commit_free(struct nfs_write_data *p);
extern int nfs_initiate_write(struct nfs_write_data *data,
			      struct rpc_clnt *clnt,
			      const struct rpc_call_ops *call_ops,
			      int how);
extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
extern int nfs_initiate_commit(struct nfs_write_data *data,
			       struct rpc_clnt *clnt,
			       const struct rpc_call_ops *call_ops,
			       int how);
extern void nfs_init_commit(struct nfs_write_data *data,
			    struct list_head *head,
			    struct pnfs_layout_segment *lseg);
void nfs_retry_commit(struct list_head *page_list,
		      struct pnfs_layout_segment *lseg);
void nfs_commit_clear_lock(struct nfs_inode *nfsi);
void nfs_commitdata_release(void *data);
void nfs_commit_release_pages(struct nfs_write_data *data);

#ifdef CONFIG_MIGRATION
extern int nfs_migrate_page(struct address_space *,
		struct page *, struct page *);
#else
#define nfs_migrate_page NULL
#endif

/* nfs4proc.c */
extern void __nfs4_read_done_cb(struct nfs_read_data *);
extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data);
extern int nfs4_init_client(struct nfs_client *clp,
			    const struct rpc_timeout *timeparms,
			    const char *ip_addr,
			    rpc_authflavor_t authflavour,
			    int noresvport);
extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data);
extern int _nfs4_call_sync(struct rpc_clnt *clnt,
			   struct nfs_server *server,
			   struct rpc_message *msg,
			   struct nfs4_sequence_args *args,
			   struct nfs4_sequence_res *res,
			   int cache_reply);
extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
				   struct nfs_server *server,
				   struct rpc_message *msg,
				   struct nfs4_sequence_args *args,
				   struct nfs4_sequence_res *res,
				   int cache_reply);

/*
 * Determine the device name as a string
 */
static inline char *nfs_devname(struct dentry *dentry,
				char *buffer, ssize_t buflen)
{
	char *dummy;
	return nfs_path(&dummy, dentry, buffer, buflen);
}

/*
 * Determine the actual block size (and log2 thereof)
 */
static inline
unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
{
	/* make sure blocksize is a power of two */
	if ((bsize & (bsize - 1)) || nrbitsp) {
		unsigned char	nrbits;

		for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
			;
		bsize = 1 << nrbits;
		if (nrbitsp)
			*nrbitsp = nrbits;
	}

	return bsize;
}

/*
 * Calculate the number of 512byte blocks used.
 */
static inline blkcnt_t nfs_calc_block_size(u64 tsize)
{
	blkcnt_t used = (tsize + 511) >> 9;
	return (used > ULONG_MAX) ? ULONG_MAX : used;
}

/*
 * Compute and set NFS server blocksize
 */
static inline
unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
{
	if (bsize < NFS_MIN_FILE_IO_SIZE)
		bsize = NFS_DEF_FILE_IO_SIZE;
	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
		bsize = NFS_MAX_FILE_IO_SIZE;

	return nfs_block_bits(bsize, nrbitsp);
}

/*
 * Determine the maximum file size for a superblock
 */
static inline
void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
{
	sb->s_maxbytes = (loff_t)maxfilesize;
	if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
		sb->s_maxbytes = MAX_LFS_FILESIZE;
}

/*
 * Determine the number of bytes of data the page contains
 */
static inline
unsigned int nfs_page_length(struct page *page)
{
	loff_t i_size = i_size_read(page->mapping->host);

	if (i_size > 0) {
		pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
		if (page->index < end_index)
			return PAGE_CACHE_SIZE;
		if (page->index == end_index)
			return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
	}
	return 0;
}

/*
 * Convert a umode to a dirent->d_type
 */
static inline
unsigned char nfs_umode_to_dtype(umode_t mode)
{
	return (mode >> 12) & 15;
}

/*
 * Determine the number of pages in an array of length 'len' and
 * with a base offset of 'base'
 */
static inline
unsigned int nfs_page_array_len(unsigned int base, size_t len)
{
	return ((unsigned long)len + (unsigned long)base +
		PAGE_SIZE - 1) >> PAGE_SHIFT;
}

/*
 * Helper for restarting RPC calls in the possible presence of NFSv4.1
 * sessions.
 */
static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
{
	if (nfs4_has_session(clp))
		return rpc_restart_call_prepare(task);
	return rpc_restart_call(task);
}
Commit	Line	Data
f7b422b1 DH	1	/*
	2	* NFS internal definitions
	3	*/
	4
eedc020e	5	#include "nfs4_fs.h"
f7b422b1	6	#include <linux/mount.h>
f9c3a380	7	#include <linux/security.h>
f7b422b1	8
08734048 DH	9	#define NFS_MS_MASK (MS_RDONLY\|MS_NOSUID\|MS_NODEV\|MS_NOEXEC\|MS_SYNCHRONOUS)
08734048 DH	10
54ceac45	11	struct nfs_string;
54ceac45 DH	12
	13	/* Maximum number of readahead requests
	14	* FIXME: this should really be a sysctl so that users may tune it to suit
	15	* their needs. People that do NFS over a slow network, might for
	16	* instance want to reduce it to something closer to 1 for improved
	17	* interactive response.
	18	*/
	19	#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
	20
eedc020e AA	21	/*
	22	* Determine if sessions are in use.
	23	*/
	24	static inline int nfs4_has_session(const struct nfs_client *clp)
	25	{
	26	#ifdef CONFIG_NFS_V4_1
	27	if (clp->cl_session)
	28	return 1;
	29	#endif /* CONFIG_NFS_V4_1 */
	30	return 0;
	31	}
	32
d8cb1a7c AB	33	static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
	34	{
	35	#ifdef CONFIG_NFS_V4_1
	36	if (nfs4_has_session(clp))
	37	return (clp->cl_session->flags & SESSION4_PERSIST);
	38	#endif /* CONFIG_NFS_V4_1 */
	39	return 0;
	40	}
	41
7ebb9315 BS	42	static inline void nfs_attr_check_mountpoint(struct super_block parent, struct nfs_fattr fattr)
	43	{
	44	if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
	45	fattr->valid \|= NFS_ATTR_FATTR_MOUNTPOINT;
	46	}
	47
533eb461 AA	48	static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
	49	{
	50	if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) \|\|
	51	(((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
	52	((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
	53	return 0;
	54
	55	fattr->fileid = fattr->mounted_on_fileid;
	56	return 1;
	57	}
	58
f7b422b1 DH	59	struct nfs_clone_mount {
	60	const struct super_block *sb;
	61	const struct dentry *dentry;
	62	struct nfs_fh *fh;
	63	struct nfs_fattr *fattr;
	64	char *hostname;
	65	char *mnt_path;
6677d095 CL	66	struct sockaddr *addr;
6677d095 CL	67	size_t addrlen;
f7b422b1 DH	68	rpc_authflavor_t authflavor;
	69	};
	70
a14017db CL	71	/*
	72	* Note: RFC 1813 doesn't limit the number of auth flavors that
	73	* a server can return, so make something up.
	74	*/
	75	#define NFS_MAX_SECFLAVORS (12)
	76
4cfd74fc CL	77	/*
	78	* Value used if the user did not specify a port value.
	79	*/
	80	#define NFS_UNSPEC_PORT (-1)
	81
56e4ebf8 BS	82	/*
	83	* Maximum number of pages that readdir can use for creating
	84	* a vmapped array of pages.
	85	*/
	86	#define NFS_MAX_READDIR_PAGES 8
	87
6b18eaa0 TT	88	/*
	89	* In-kernel mount arguments
	90	*/
	91	struct nfs_parsed_mount_data {
	92	int flags;
	93	int rsize, wsize;
	94	int timeo, retrans;
	95	int acregmin, acregmax,
	96	acdirmin, acdirmax;
	97	int namlen;
b797cac7	98	unsigned int options;
6b18eaa0 TT	99	unsigned int bsize;
	100	unsigned int auth_flavor_len;
	101	rpc_authflavor_t auth_flavors[1];
	102	char *client_address;
764302cc	103	unsigned int version;
3fd5be9e	104	unsigned int minorversion;
08734048	105	char *fscache_uniq;
6b18eaa0 TT	106
6b18eaa0 TT	107	struct {
4c568017 CL	108	struct sockaddr_storage address;
4c568017 CL	109	size_t addrlen;
6b18eaa0	110	char *hostname;
78fa701f	111	u32 version;
4cfd74fc	112	int port;
78fa701f	113	unsigned short protocol;
6b18eaa0 TT	114	} mount_server;
	115
	116	struct {
4c568017 CL	117	struct sockaddr_storage address;
4c568017 CL	118	size_t addrlen;
6b18eaa0 TT	119	char *hostname;
6b18eaa0 TT	120	char *export_path;
4cfd74fc	121	int port;
78fa701f	122	unsigned short protocol;
6b18eaa0	123	} nfs_server;
f9c3a380 EP	124
f9c3a380 EP	125	struct security_mnt_opts lsm_opts;
6b18eaa0 TT	126	};
6b18eaa0 TT	127
146ec944	128	/* mount_clnt.c */
c5d120f8 CL	129	struct nfs_mount_request {
	130	struct sockaddr *sap;
	131	size_t salen;
	132	char *hostname;
	133	char *dirpath;
	134	u32 version;
	135	unsigned short protocol;
	136	struct nfs_fh *fh;
50a737f8	137	int noresvport;
8e02f6b9 CL	138	unsigned int *auth_flav_len;
8e02f6b9 CL	139	rpc_authflavor_t *auth_flavs;
c5d120f8 CL	140	};
	141
	142	extern int nfs_mount(struct nfs_mount_request *info);
0b524123	143	extern void nfs_umount(const struct nfs_mount_request *info);
146ec944	144
24c8dbbb	145	/* client.c */
54ceac45 DH	146	extern struct rpc_program nfs_program;
54ceac45 DH	147
f4eecd5d	148	extern void nfs_cleanup_cb_ident_idr(void);
24c8dbbb	149	extern void nfs_put_client(struct nfs_client *);
c36fca52 AA	150	extern struct nfs_client nfs4_find_client_no_ident(const struct sockaddr );
	151	extern struct nfs_client *nfs4_find_client_ident(int);
	152	extern struct nfs_client *
778be232	153	nfs4_find_client_sessionid(const struct sockaddr , struct nfs4_sessionid );
2283f8d6 TT	154	extern struct nfs_server *nfs_create_server(
	155	const struct nfs_parsed_mount_data *,
	156	struct nfs_fh *);
91ea40b9 TT	157	extern struct nfs_server *nfs4_create_server(
	158	const struct nfs_parsed_mount_data *,
	159	struct nfs_fh *);
54ceac45 DH	160	extern struct nfs_server nfs4_create_referral_server(struct nfs_clone_mount ,
	161	struct nfs_fh *);
	162	extern void nfs_free_server(struct nfs_server *server);
	163	extern struct nfs_server nfs_clone_server(struct nfs_server ,
	164	struct nfs_fh *,
	165	struct nfs_fattr *);
76db6d95	166	extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
008f55d0	167	extern int nfs4_check_client_ready(struct nfs_client *clp);
d83217c1 AA	168	extern struct nfs_client nfs4_set_ds_client(struct nfs_client mds_clp,
	169	const struct sockaddr *ds_addr,
	170	int ds_addrlen, int ds_proto);
6aaca566 DH	171	#ifdef CONFIG_PROC_FS
	172	extern int __init nfs_fs_proc_init(void);
	173	extern void nfs_fs_proc_exit(void);
	174	#else
	175	static inline int nfs_fs_proc_init(void)
	176	{
	177	return 0;
	178	}
	179	static inline void nfs_fs_proc_exit(void)
	180	{
	181	}
	182	#endif
24c8dbbb	183
7d4e2747	184	/* nfs4namespace.c */
f7b422b1	185	#ifdef CONFIG_NFS_V4
f8ad9c4b	186	extern struct vfsmount nfs_do_refmount(struct dentry dentry);
f7b422b1 DH	187	#else
f7b422b1 DH	188	static inline
f8ad9c4b	189	struct vfsmount nfs_do_refmount(struct dentry dentry)
f7b422b1 DH	190	{
	191	return ERR_PTR(-ENOENT);
	192	}
	193	#endif
	194
	195	/* callback_xdr.c */
	196	extern struct svc_version nfs4_callback_version1;
07bccc2d	197	extern struct svc_version nfs4_callback_version4;
f7b422b1 DH	198
	199	/* pagelist.c */
	200	extern int __init nfs_init_nfspagecache(void);
266bee88	201	extern void nfs_destroy_nfspagecache(void);
f7b422b1	202	extern int __init nfs_init_readpagecache(void);
266bee88	203	extern void nfs_destroy_readpagecache(void);
f7b422b1	204	extern int __init nfs_init_writepagecache(void);
266bee88	205	extern void nfs_destroy_writepagecache(void);
f7b422b1	206
f7b422b1	207	extern int __init nfs_init_directcache(void);
266bee88	208	extern void nfs_destroy_directcache(void);
f7b422b1 DH	209
f7b422b1 DH	210	/* nfs2xdr.c */
85828493	211	extern int nfs_stat_to_errno(enum nfs_stat);
f7b422b1	212	extern struct rpc_procinfo nfs_procedures[];
573c4e1e CL	213	extern int nfs2_decode_dirent(struct xdr_stream *,
573c4e1e CL	214	struct nfs_entry *, int);
f7b422b1 DH	215
	216	/* nfs3xdr.c */
	217	extern struct rpc_procinfo nfs3_procedures[];
573c4e1e CL	218	extern int nfs3_decode_dirent(struct xdr_stream *,
573c4e1e CL	219	struct nfs_entry *, int);
f7b422b1 DH	220
f7b422b1 DH	221	/* nfs4xdr.c */
7d4e2747	222	#ifdef CONFIG_NFS_V4
573c4e1e CL	223	extern int nfs4_decode_dirent(struct xdr_stream *,
573c4e1e CL	224	struct nfs_entry *, int);
7d4e2747	225	#endif
2449ea2e AB	226	#ifdef CONFIG_NFS_V4_1
	227	extern const u32 nfs41_maxread_overhead;
	228	extern const u32 nfs41_maxwrite_overhead;
	229	#endif
f7b422b1 DH	230
f7b422b1 DH	231	/* nfs4proc.c */
d75d5414	232	#ifdef CONFIG_NFS_V4
f7b422b1	233	extern struct rpc_procinfo nfs4_procedures[];
7ebb9315	234	void nfs_fixup_secinfo_attributes(struct nfs_fattr , struct nfs_fh );
d75d5414	235	#endif
f7b422b1	236
d83217c1 AA	237	extern int nfs4_init_ds_session(struct nfs_client *clp);
d83217c1 AA	238
7fe5c398 TM	239	/* proc.c */
7fe5c398 TM	240	void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
45a52a02 AA	241	extern int nfs_init_client(struct nfs_client *clp,
	242	const struct rpc_timeout *timeparms,
	243	const char *ip_addr, rpc_authflavor_t authflavour,
	244	int noresvport);
7fe5c398	245
979df72e	246	/* dir.c */
7f8275d0	247	extern int nfs_access_cache_shrinker(struct shrinker *shrink,
1495f230	248	struct shrink_control *sc);
979df72e	249
f7b422b1	250	/* inode.c */
5746006f	251	extern struct workqueue_struct *nfsiod_workqueue;
f7b422b1 DH	252	extern struct inode nfs_alloc_inode(struct super_block sb);
f7b422b1 DH	253	extern void nfs_destroy_inode(struct inode *);
a9185b41	254	extern int nfs_write_inode(struct inode , struct writeback_control );
b57922d9	255	extern void nfs_evict_inode(struct inode *);
f7b422b1	256	#ifdef CONFIG_NFS_V4
b57922d9	257	extern void nfs4_evict_inode(struct inode *);
f7b422b1	258	#endif
f41f7418	259	void nfs_zap_acl_cache(struct inode *inode);
72cb77f4	260	extern int nfs_wait_bit_killable(void *word);
f7b422b1 DH	261
f7b422b1 DH	262	/* super.c */
54ceac45	263	extern struct file_system_type nfs_xdev_fs_type;
f7b422b1	264	#ifdef CONFIG_NFS_V4
54ceac45 DH	265	extern struct file_system_type nfs4_xdev_fs_type;
54ceac45 DH	266	extern struct file_system_type nfs4_referral_fs_type;
f7b422b1	267	#endif
4ebd9ab3	268
f7b422b1	269	extern struct rpc_stat nfs_rpcstat;
4ebd9ab3	270
f7b422b1 DH	271	extern int __init register_nfs_fs(void);
f7b422b1 DH	272	extern void __exit unregister_nfs_fs(void);
1daef0a8 TM	273	extern void nfs_sb_active(struct super_block *sb);
1daef0a8 TM	274	extern void nfs_sb_deactive(struct super_block *sb);
f7b422b1 DH	275
f7b422b1 DH	276	/* namespace.c */
b514f872	277	extern char nfs_path(char p, struct dentry dentry,
f7b422b1	278	char *buffer, ssize_t buflen);
36d43a43	279	extern struct vfsmount nfs_d_automount(struct path path);
fca78d6d BS	280	#ifdef CONFIG_NFS_V4
	281	rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
	282	#endif
f7b422b1	283
54ceac45	284	/* getroot.c */
0d5839ad AV	285	extern struct dentry nfs_get_root(struct super_block , struct nfs_fh *,
0d5839ad AV	286	const char *);
7d4e2747	287	#ifdef CONFIG_NFS_V4
0d5839ad AV	288	extern struct dentry nfs4_get_root(struct super_block , struct nfs_fh *,
0d5839ad AV	289	const char *);
54ceac45	290
815409d2	291	extern int nfs4_get_rootfh(struct nfs_server server, struct nfs_fh mntfh);
7d4e2747	292	#endif
f7b422b1	293
f11c88af	294	/* read.c */
dc70d7b3 AA	295	extern int nfs_initiate_read(struct nfs_read_data data, struct rpc_clnt clnt,
dc70d7b3 AA	296	const struct rpc_call_ops *call_ops);
f11c88af AA	297	extern void nfs_read_prepare(struct rpc_task task, void calldata);
f11c88af AA	298
e885de1a TM	299	struct nfs_pageio_descriptor;
	300	extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
	301	struct inode *inode);
	302
def6ed7e	303	/* write.c */
e885de1a TM	304	extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
e885de1a TM	305	struct inode *inode, int ioflags);
e0c2b380	306	extern void nfs_commit_free(struct nfs_write_data *p);
a69aef14 FI	307	extern int nfs_initiate_write(struct nfs_write_data *data,
	308	struct rpc_clnt *clnt,
	309	const struct rpc_call_ops *call_ops,
	310	int how);
def6ed7e	311	extern void nfs_write_prepare(struct rpc_task task, void calldata);
e0c2b380 FI	312	extern int nfs_initiate_commit(struct nfs_write_data *data,
	313	struct rpc_clnt *clnt,
	314	const struct rpc_call_ops *call_ops,
	315	int how);
	316	extern void nfs_init_commit(struct nfs_write_data *data,
	317	struct list_head *head,
	318	struct pnfs_layout_segment *lseg);
	319	void nfs_retry_commit(struct list_head *page_list,
	320	struct pnfs_layout_segment *lseg);
	321	void nfs_commit_clear_lock(struct nfs_inode *nfsi);
	322	void nfs_commitdata_release(void *data);
	323	void nfs_commit_release_pages(struct nfs_write_data *data);
	324
074cc1de TM	325	#ifdef CONFIG_MIGRATION
	326	extern int nfs_migrate_page(struct address_space *,
	327	struct page , struct page );
	328	#else
	329	#define nfs_migrate_page NULL
	330	#endif
def6ed7e	331
cccef3b9	332	/* nfs4proc.c */
d20581aa	333	extern void __nfs4_read_done_cb(struct nfs_read_data *);
cbdabc7f	334	extern void nfs4_reset_read(struct rpc_task task, struct nfs_read_data data);
45a52a02 AA	335	extern int nfs4_init_client(struct nfs_client *clp,
	336	const struct rpc_timeout *timeparms,
	337	const char *ip_addr,
	338	rpc_authflavor_t authflavour,
	339	int noresvport);
a69aef14	340	extern void nfs4_reset_write(struct rpc_task task, struct nfs_write_data data);
7c513058 BS	341	extern int _nfs4_call_sync(struct rpc_clnt *clnt,
7c513058 BS	342	struct nfs_server *server,
cccef3b9 AA	343	struct rpc_message *msg,
	344	struct nfs4_sequence_args *args,
	345	struct nfs4_sequence_res *res,
	346	int cache_reply);
7c513058 BS	347	extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
7c513058 BS	348	struct nfs_server *server,
cccef3b9 AA	349	struct rpc_message *msg,
	350	struct nfs4_sequence_args *args,
	351	struct nfs4_sequence_res *res,
	352	int cache_reply);
	353
f7b422b1 DH	354	/*
	355	* Determine the device name as a string
	356	*/
b514f872	357	static inline char nfs_devname(struct dentry dentry,
54ceac45	358	char *buffer, ssize_t buflen)
f7b422b1	359	{
b514f872 AV	360	char *dummy;
b514f872 AV	361	return nfs_path(&dummy, dentry, buffer, buflen);
f7b422b1 DH	362	}
	363
	364	/*
	365	* Determine the actual block size (and log2 thereof)
	366	*/
	367	static inline
	368	unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
	369	{
	370	/* make sure blocksize is a power of two */
	371	if ((bsize & (bsize - 1)) \|\| nrbitsp) {
	372	unsigned char nrbits;
	373
	374	for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
	375	;
	376	bsize = 1 << nrbits;
	377	if (nrbitsp)
	378	*nrbitsp = nrbits;
	379	}
	380
	381	return bsize;
	382	}
	383
	384	/*
	385	* Calculate the number of 512byte blocks used.
	386	*/
9eaa67c6	387	static inline blkcnt_t nfs_calc_block_size(u64 tsize)
f7b422b1	388	{
9eaa67c6	389	blkcnt_t used = (tsize + 511) >> 9;
f7b422b1 DH	390	return (used > ULONG_MAX) ? ULONG_MAX : used;
	391	}
	392
	393	/*
	394	* Compute and set NFS server blocksize
	395	*/
	396	static inline
	397	unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
	398	{
	399	if (bsize < NFS_MIN_FILE_IO_SIZE)
	400	bsize = NFS_DEF_FILE_IO_SIZE;
	401	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
	402	bsize = NFS_MAX_FILE_IO_SIZE;
	403
	404	return nfs_block_bits(bsize, nrbitsp);
	405	}
	406
	407	/*
	408	* Determine the maximum file size for a superblock
	409	*/
	410	static inline
	411	void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
	412	{
	413	sb->s_maxbytes = (loff_t)maxfilesize;
	414	if (sb->s_maxbytes > MAX_LFS_FILESIZE \|\| sb->s_maxbytes <= 0)
	415	sb->s_maxbytes = MAX_LFS_FILESIZE;
	416	}
49a70f27 TM	417
	418	/*
	419	* Determine the number of bytes of data the page contains
	420	*/
	421	static inline
	422	unsigned int nfs_page_length(struct page *page)
	423	{
	424	loff_t i_size = i_size_read(page->mapping->host);
	425
	426	if (i_size > 0) {
	427	pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
	428	if (page->index < end_index)
	429	return PAGE_CACHE_SIZE;
	430	if (page->index == end_index)
	431	return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
	432	}
	433	return 0;
	434	}
8d5658c9	435
0b26a0bf TM	436	/*
	437	* Convert a umode to a dirent->d_type
	438	*/
	439	static inline
	440	unsigned char nfs_umode_to_dtype(umode_t mode)
	441	{
	442	return (mode >> 12) & 15;
	443	}
	444
8d5658c9 TM	445	/*
	446	* Determine the number of pages in an array of length 'len' and
	447	* with a base offset of 'base'
	448	*/
	449	static inline
	450	unsigned int nfs_page_array_len(unsigned int base, size_t len)
	451	{
	452	return ((unsigned long)len + (unsigned long)base +
	453	PAGE_SIZE - 1) >> PAGE_SHIFT;
	454	}
0110ee15 TM	455
	456	/*
	457	* Helper for restarting RPC calls in the possible presence of NFSv4.1
	458	* sessions.
	459	*/
d05dd4e9	460	static inline int nfs_restart_rpc(struct rpc_task task, const struct nfs_client clp)
0110ee15 TM	461	{
0110ee15 TM	462	if (nfs4_has_session(clp))
d05dd4e9 TM	463	return rpc_restart_call_prepare(task);
d05dd4e9 TM	464	return rpc_restart_call(task);
0110ee15	465	}