[mirror_ubuntu-artful-kernel.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;
	struct net		*net;
};

/* 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;
	struct net		*net;
};

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

/* client.c */
extern const struct rpc_program nfs_program;
extern void nfs_clients_init(struct net *net);

extern void nfs_cleanup_cb_ident_idr(struct net *);
extern void nfs_put_client(struct nfs_client *);
extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
extern struct nfs_client *
nfs4_find_client_sessionid(struct net *, 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 *,
					   rpc_authflavor_t);
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

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

struct nfs_pageio_descriptor;
/* 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);
extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
			      struct nfs_pgio_header *hdr,
			      void (*release)(struct nfs_pgio_header *hdr));
void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);

/* 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[];
#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);
struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
			      struct nfs_fh *, struct nfs_fattr *);
struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
				 struct nfs_fattr *, rpc_authflavor_t);

/* 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

struct nfs_pgio_completion_ops;
/* read.c */
extern struct nfs_read_header *nfs_readhdr_alloc(void);
extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
			struct inode *inode,
			const struct nfs_pgio_completion_ops *compl_ops);
extern int nfs_initiate_read(struct rpc_clnt *clnt,
			     struct nfs_read_data *data,
			     const struct rpc_call_ops *call_ops);
extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
			      struct nfs_pgio_header *hdr);
extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
			struct inode *inode,
			const struct nfs_pgio_completion_ops *compl_ops);
extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
extern void nfs_readdata_release(struct nfs_read_data *rdata);

/* write.c */
extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
			struct inode *inode, int ioflags,
			const struct nfs_pgio_completion_ops *compl_ops);
extern struct nfs_write_header *nfs_writehdr_alloc(void);
extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
			     struct nfs_pgio_header *hdr);
extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
			struct inode *inode, int ioflags,
			const struct nfs_pgio_completion_ops *compl_ops);
extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
extern void nfs_writedata_release(struct nfs_write_data *wdata);
extern void nfs_commit_free(struct nfs_commit_data *p);
extern int nfs_initiate_write(struct rpc_clnt *clnt,
			      struct nfs_write_data *data,
			      const struct rpc_call_ops *call_ops,
			      int how);
extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
extern int nfs_initiate_commit(struct rpc_clnt *clnt,
			       struct nfs_commit_data *data,
			       const struct rpc_call_ops *call_ops,
			       int how);
extern void nfs_init_commit(struct nfs_commit_data *data,
			    struct list_head *head,
			    struct pnfs_layout_segment *lseg,
			    struct nfs_commit_info *cinfo);
int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
			 struct nfs_commit_info *cinfo, int max);
int nfs_scan_commit(struct inode *inode, struct list_head *dst,
		    struct nfs_commit_info *cinfo);
void nfs_mark_request_commit(struct nfs_page *req,
			     struct pnfs_layout_segment *lseg,
			     struct nfs_commit_info *cinfo);
int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
			    int how, struct nfs_commit_info *cinfo);
void nfs_retry_commit(struct list_head *page_list,
		      struct pnfs_layout_segment *lseg,
		      struct nfs_commit_info *cinfo);
void nfs_commitdata_release(struct nfs_commit_data *data);
void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
				 struct nfs_commit_info *cinfo);
void nfs_request_remove_commit_list(struct nfs_page *req,
				    struct nfs_commit_info *cinfo);
void nfs_init_cinfo(struct nfs_commit_info *cinfo,
		    struct inode *inode,
		    struct nfs_direct_req *dreq);

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

/* direct.c */
void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
			      struct nfs_direct_req *dreq);

/* 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;
}

/*
 * Convert a struct timespec into a 64-bit change attribute
 *
 * This does approximately the same thing as timespec_to_ns(),
 * but for calculation efficiency, we multiply the seconds by
 * 1024*1024*1024.
 */
static inline
u64 nfs_timespec_to_change_attr(const struct timespec *ts)
{
	return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
}
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;
e50a7a1a	126	struct net *net;
6b18eaa0 TT	127	};
6b18eaa0 TT	128
146ec944	129	/* mount_clnt.c */
c5d120f8 CL	130	struct nfs_mount_request {
	131	struct sockaddr *sap;
	132	size_t salen;
	133	char *hostname;
	134	char *dirpath;
	135	u32 version;
	136	unsigned short protocol;
	137	struct nfs_fh *fh;
50a737f8	138	int noresvport;
8e02f6b9 CL	139	unsigned int *auth_flav_len;
8e02f6b9 CL	140	rpc_authflavor_t *auth_flavs;
6d59b8d5	141	struct net *net;
c5d120f8 CL	142	};
	143
	144	extern int nfs_mount(struct nfs_mount_request *info);
0b524123	145	extern void nfs_umount(const struct nfs_mount_request *info);
146ec944	146
24c8dbbb	147	/* client.c */
a613fa16	148	extern const struct rpc_program nfs_program;
6b13168b	149	extern void nfs_clients_init(struct net *net);
54ceac45	150
28cd1b3f	151	extern void nfs_cleanup_cb_ident_idr(struct net *);
24c8dbbb	152	extern void nfs_put_client(struct nfs_client *);
28cd1b3f	153	extern struct nfs_client nfs4_find_client_ident(struct net , int);
c36fca52	154	extern struct nfs_client *
c7add9a9 SK	155	nfs4_find_client_sessionid(struct net , const struct sockaddr ,
c7add9a9 SK	156	struct nfs4_sessionid *);
2283f8d6 TT	157	extern struct nfs_server *nfs_create_server(
	158	const struct nfs_parsed_mount_data *,
	159	struct nfs_fh *);
91ea40b9 TT	160	extern struct nfs_server *nfs4_create_server(
	161	const struct nfs_parsed_mount_data *,
	162	struct nfs_fh *);
54ceac45 DH	163	extern struct nfs_server nfs4_create_referral_server(struct nfs_clone_mount ,
	164	struct nfs_fh *);
	165	extern void nfs_free_server(struct nfs_server *server);
	166	extern struct nfs_server nfs_clone_server(struct nfs_server ,
	167	struct nfs_fh *,
7e6eb683 BS	168	struct nfs_fattr *,
7e6eb683 BS	169	rpc_authflavor_t);
76db6d95	170	extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
008f55d0	171	extern int nfs4_check_client_ready(struct nfs_client *clp);
d83217c1 AA	172	extern struct nfs_client nfs4_set_ds_client(struct nfs_client mds_clp,
	173	const struct sockaddr *ds_addr,
	174	int ds_addrlen, int ds_proto);
6aaca566 DH	175	#ifdef CONFIG_PROC_FS
	176	extern int __init nfs_fs_proc_init(void);
	177	extern void nfs_fs_proc_exit(void);
	178	#else
	179	static inline int nfs_fs_proc_init(void)
	180	{
	181	return 0;
	182	}
	183	static inline void nfs_fs_proc_exit(void)
	184	{
	185	}
	186	#endif
24c8dbbb	187
f7b422b1 DH	188	/* callback_xdr.c */
f7b422b1 DH	189	extern struct svc_version nfs4_callback_version1;
07bccc2d	190	extern struct svc_version nfs4_callback_version4;
f7b422b1	191
4db6e0b7	192	struct nfs_pageio_descriptor;
f7b422b1 DH	193	/* pagelist.c */
f7b422b1 DH	194	extern int __init nfs_init_nfspagecache(void);
266bee88	195	extern void nfs_destroy_nfspagecache(void);
f7b422b1	196	extern int __init nfs_init_readpagecache(void);
266bee88	197	extern void nfs_destroy_readpagecache(void);
f7b422b1	198	extern int __init nfs_init_writepagecache(void);
266bee88	199	extern void nfs_destroy_writepagecache(void);
f7b422b1	200
f7b422b1	201	extern int __init nfs_init_directcache(void);
266bee88	202	extern void nfs_destroy_directcache(void);
30dd374f	203	extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
4db6e0b7 FI	204	extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
	205	struct nfs_pgio_header *hdr,
	206	void (release)(struct nfs_pgio_header hdr));
	207	void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
f7b422b1 DH	208
f7b422b1 DH	209	/* nfs2xdr.c */
85828493	210	extern int nfs_stat_to_errno(enum nfs_stat);
f7b422b1	211	extern struct rpc_procinfo nfs_procedures[];
573c4e1e CL	212	extern int nfs2_decode_dirent(struct xdr_stream *,
573c4e1e CL	213	struct nfs_entry *, int);
f7b422b1 DH	214
	215	/* nfs3xdr.c */
	216	extern struct rpc_procinfo nfs3_procedures[];
573c4e1e CL	217	extern int nfs3_decode_dirent(struct xdr_stream *,
573c4e1e CL	218	struct nfs_entry *, int);
f7b422b1 DH	219
f7b422b1 DH	220	/* nfs4xdr.c */
7d4e2747	221	#ifdef CONFIG_NFS_V4
573c4e1e CL	222	extern int nfs4_decode_dirent(struct xdr_stream *,
573c4e1e CL	223	struct nfs_entry *, int);
7d4e2747	224	#endif
2449ea2e AB	225	#ifdef CONFIG_NFS_V4_1
	226	extern const u32 nfs41_maxread_overhead;
	227	extern const u32 nfs41_maxwrite_overhead;
	228	#endif
f7b422b1 DH	229
f7b422b1 DH	230	/* nfs4proc.c */
d75d5414	231	#ifdef CONFIG_NFS_V4
f7b422b1	232	extern struct rpc_procinfo nfs4_procedures[];
d75d5414	233	#endif
f7b422b1	234
d83217c1 AA	235	extern int nfs4_init_ds_session(struct nfs_client *clp);
d83217c1 AA	236
7fe5c398 TM	237	/* proc.c */
7fe5c398 TM	238	void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
45a52a02 AA	239	extern int nfs_init_client(struct nfs_client *clp,
	240	const struct rpc_timeout *timeparms,
	241	const char *ip_addr, rpc_authflavor_t authflavour,
	242	int noresvport);
7fe5c398	243
979df72e	244	/* dir.c */
7f8275d0	245	extern int nfs_access_cache_shrinker(struct shrinker *shrink,
1495f230	246	struct shrink_control *sc);
979df72e	247
f7b422b1	248	/* inode.c */
5746006f	249	extern struct workqueue_struct *nfsiod_workqueue;
f7b422b1 DH	250	extern struct inode nfs_alloc_inode(struct super_block sb);
f7b422b1 DH	251	extern void nfs_destroy_inode(struct inode *);
a9185b41	252	extern int nfs_write_inode(struct inode , struct writeback_control );
b57922d9	253	extern void nfs_evict_inode(struct inode *);
f7b422b1	254	#ifdef CONFIG_NFS_V4
b57922d9	255	extern void nfs4_evict_inode(struct inode *);
f7b422b1	256	#endif
f41f7418	257	void nfs_zap_acl_cache(struct inode *inode);
72cb77f4	258	extern int nfs_wait_bit_killable(void *word);
f7b422b1 DH	259
f7b422b1 DH	260	/* super.c */
54ceac45	261	extern struct file_system_type nfs_xdev_fs_type;
f7b422b1	262	#ifdef CONFIG_NFS_V4
54ceac45 DH	263	extern struct file_system_type nfs4_xdev_fs_type;
54ceac45 DH	264	extern struct file_system_type nfs4_referral_fs_type;
f7b422b1	265	#endif
4ebd9ab3	266
f7b422b1	267	extern struct rpc_stat nfs_rpcstat;
4ebd9ab3	268
f7b422b1 DH	269	extern int __init register_nfs_fs(void);
f7b422b1 DH	270	extern void __exit unregister_nfs_fs(void);
1daef0a8 TM	271	extern void nfs_sb_active(struct super_block *sb);
1daef0a8 TM	272	extern void nfs_sb_deactive(struct super_block *sb);
f7b422b1 DH	273
f7b422b1 DH	274	/* namespace.c */
b514f872	275	extern char nfs_path(char p, struct dentry dentry,
f7b422b1	276	char *buffer, ssize_t buflen);
36d43a43	277	extern struct vfsmount nfs_d_automount(struct path path);
281cad46 BS	278	struct vfsmount nfs_submount(struct nfs_server , struct dentry *,
	279	struct nfs_fh , struct nfs_fattr );
	280	struct vfsmount nfs_do_submount(struct dentry , struct nfs_fh *,
	281	struct nfs_fattr *, rpc_authflavor_t);
f7b422b1	282
54ceac45	283	/* getroot.c */
0d5839ad AV	284	extern struct dentry nfs_get_root(struct super_block , struct nfs_fh *,
0d5839ad AV	285	const char *);
7d4e2747	286	#ifdef CONFIG_NFS_V4
0d5839ad AV	287	extern struct dentry nfs4_get_root(struct super_block , struct nfs_fh *,
0d5839ad AV	288	const char *);
54ceac45	289
815409d2	290	extern int nfs4_get_rootfh(struct nfs_server server, struct nfs_fh mntfh);
7d4e2747	291	#endif
f7b422b1	292
061ae2ed	293	struct nfs_pgio_completion_ops;
f11c88af	294	/* read.c */
4db6e0b7	295	extern struct nfs_read_header *nfs_readhdr_alloc(void);
cd841605	296	extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
584aa810 FI	297	extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
	298	struct inode *inode,
	299	const struct nfs_pgio_completion_ops *compl_ops);
c5996c4e FI	300	extern int nfs_initiate_read(struct rpc_clnt *clnt,
c5996c4e FI	301	struct nfs_read_data *data,
dc70d7b3	302	const struct rpc_call_ops *call_ops);
f11c88af	303	extern void nfs_read_prepare(struct rpc_task task, void calldata);
493292dd	304	extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
4db6e0b7	305	struct nfs_pgio_header *hdr);
62e4a769	306	extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
061ae2ed FI	307	struct inode *inode,
061ae2ed FI	308	const struct nfs_pgio_completion_ops *compl_ops);
493292dd TM	309	extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
493292dd TM	310	extern void nfs_readdata_release(struct nfs_read_data *rdata);
e885de1a	311
def6ed7e	312	/* write.c */
1763da12 FI	313	extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
	314	struct inode *inode, int ioflags,
	315	const struct nfs_pgio_completion_ops *compl_ops);
6c75dc0d	316	extern struct nfs_write_header *nfs_writehdr_alloc(void);
cd841605	317	extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
dce81290	318	extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
6c75dc0d	319	struct nfs_pgio_header *hdr);
e2fecb21	320	extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
061ae2ed FI	321	struct inode *inode, int ioflags,
061ae2ed FI	322	const struct nfs_pgio_completion_ops *compl_ops);
dce81290 TM	323	extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
dce81290 TM	324	extern void nfs_writedata_release(struct nfs_write_data *wdata);
0b7c0153	325	extern void nfs_commit_free(struct nfs_commit_data *p);
c5996c4e FI	326	extern int nfs_initiate_write(struct rpc_clnt *clnt,
c5996c4e FI	327	struct nfs_write_data *data,
a69aef14 FI	328	const struct rpc_call_ops *call_ops,
a69aef14 FI	329	int how);
def6ed7e	330	extern void nfs_write_prepare(struct rpc_task task, void calldata);
0b7c0153 FI	331	extern void nfs_commit_prepare(struct rpc_task task, void calldata);
	332	extern int nfs_initiate_commit(struct rpc_clnt *clnt,
	333	struct nfs_commit_data *data,
e0c2b380 FI	334	const struct rpc_call_ops *call_ops,
e0c2b380 FI	335	int how);
0b7c0153	336	extern void nfs_init_commit(struct nfs_commit_data *data,
e0c2b380	337	struct list_head *head,
f453a54a FI	338	struct pnfs_layout_segment *lseg,
f453a54a FI	339	struct nfs_commit_info *cinfo);
1763da12 FI	340	int nfs_scan_commit_list(struct list_head src, struct list_head dst,
	341	struct nfs_commit_info *cinfo, int max);
	342	int nfs_scan_commit(struct inode inode, struct list_head dst,
	343	struct nfs_commit_info *cinfo);
	344	void nfs_mark_request_commit(struct nfs_page *req,
	345	struct pnfs_layout_segment *lseg,
	346	struct nfs_commit_info *cinfo);
	347	int nfs_generic_commit_list(struct inode inode, struct list_head head,
	348	int how, struct nfs_commit_info *cinfo);
e0c2b380	349	void nfs_retry_commit(struct list_head *page_list,
ea2cf228 FI	350	struct pnfs_layout_segment *lseg,
ea2cf228 FI	351	struct nfs_commit_info *cinfo);
0b7c0153	352	void nfs_commitdata_release(struct nfs_commit_data *data);
ea2cf228 FI	353	void nfs_request_add_commit_list(struct nfs_page req, struct list_head dst,
	354	struct nfs_commit_info *cinfo);
	355	void nfs_request_remove_commit_list(struct nfs_page *req,
	356	struct nfs_commit_info *cinfo);
	357	void nfs_init_cinfo(struct nfs_commit_info *cinfo,
	358	struct inode *inode,
	359	struct nfs_direct_req *dreq);
e0c2b380	360
074cc1de TM	361	#ifdef CONFIG_MIGRATION
074cc1de TM	362	extern int nfs_migrate_page(struct address_space *,
a6bc32b8	363	struct page , struct page , enum migrate_mode);
074cc1de TM	364	#else
	365	#define nfs_migrate_page NULL
	366	#endif
def6ed7e	367
1763da12 FI	368	/* direct.c */
	369	void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
	370	struct nfs_direct_req *dreq);
	371
cccef3b9	372	/* nfs4proc.c */
d20581aa	373	extern void __nfs4_read_done_cb(struct nfs_read_data *);
cbdabc7f	374	extern void nfs4_reset_read(struct rpc_task task, struct nfs_read_data data);
45a52a02 AA	375	extern int nfs4_init_client(struct nfs_client *clp,
	376	const struct rpc_timeout *timeparms,
	377	const char *ip_addr,
	378	rpc_authflavor_t authflavour,
	379	int noresvport);
a69aef14	380	extern void nfs4_reset_write(struct rpc_task task, struct nfs_write_data data);
7c513058 BS	381	extern int _nfs4_call_sync(struct rpc_clnt *clnt,
7c513058 BS	382	struct nfs_server *server,
cccef3b9 AA	383	struct rpc_message *msg,
	384	struct nfs4_sequence_args *args,
	385	struct nfs4_sequence_res *res,
	386	int cache_reply);
7c513058 BS	387	extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
7c513058 BS	388	struct nfs_server *server,
cccef3b9 AA	389	struct rpc_message *msg,
	390	struct nfs4_sequence_args *args,
	391	struct nfs4_sequence_res *res,
	392	int cache_reply);
	393
f7b422b1 DH	394	/*
	395	* Determine the device name as a string
	396	*/
b514f872	397	static inline char nfs_devname(struct dentry dentry,
54ceac45	398	char *buffer, ssize_t buflen)
f7b422b1	399	{
b514f872 AV	400	char *dummy;
b514f872 AV	401	return nfs_path(&dummy, dentry, buffer, buflen);
f7b422b1 DH	402	}
	403
	404	/*
	405	* Determine the actual block size (and log2 thereof)
	406	*/
	407	static inline
	408	unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
	409	{
	410	/* make sure blocksize is a power of two */
	411	if ((bsize & (bsize - 1)) \|\| nrbitsp) {
	412	unsigned char nrbits;
	413
	414	for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
	415	;
	416	bsize = 1 << nrbits;
	417	if (nrbitsp)
	418	*nrbitsp = nrbits;
	419	}
	420
	421	return bsize;
	422	}
	423
	424	/*
	425	* Calculate the number of 512byte blocks used.
	426	*/
9eaa67c6	427	static inline blkcnt_t nfs_calc_block_size(u64 tsize)
f7b422b1	428	{
9eaa67c6	429	blkcnt_t used = (tsize + 511) >> 9;
f7b422b1 DH	430	return (used > ULONG_MAX) ? ULONG_MAX : used;
	431	}
	432
	433	/*
	434	* Compute and set NFS server blocksize
	435	*/
	436	static inline
	437	unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
	438	{
	439	if (bsize < NFS_MIN_FILE_IO_SIZE)
	440	bsize = NFS_DEF_FILE_IO_SIZE;
	441	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
	442	bsize = NFS_MAX_FILE_IO_SIZE;
	443
	444	return nfs_block_bits(bsize, nrbitsp);
	445	}
	446
	447	/*
	448	* Determine the maximum file size for a superblock
	449	*/
	450	static inline
	451	void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
	452	{
	453	sb->s_maxbytes = (loff_t)maxfilesize;
	454	if (sb->s_maxbytes > MAX_LFS_FILESIZE \|\| sb->s_maxbytes <= 0)
	455	sb->s_maxbytes = MAX_LFS_FILESIZE;
	456	}
49a70f27 TM	457
	458	/*
	459	* Determine the number of bytes of data the page contains
	460	*/
	461	static inline
	462	unsigned int nfs_page_length(struct page *page)
	463	{
	464	loff_t i_size = i_size_read(page->mapping->host);
	465
	466	if (i_size > 0) {
	467	pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
	468	if (page->index < end_index)
	469	return PAGE_CACHE_SIZE;
	470	if (page->index == end_index)
	471	return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
	472	}
	473	return 0;
	474	}
8d5658c9	475
0b26a0bf TM	476	/*
	477	* Convert a umode to a dirent->d_type
	478	*/
	479	static inline
	480	unsigned char nfs_umode_to_dtype(umode_t mode)
	481	{
	482	return (mode >> 12) & 15;
	483	}
	484
8d5658c9 TM	485	/*
	486	* Determine the number of pages in an array of length 'len' and
	487	* with a base offset of 'base'
	488	*/
	489	static inline
	490	unsigned int nfs_page_array_len(unsigned int base, size_t len)
	491	{
	492	return ((unsigned long)len + (unsigned long)base +
	493	PAGE_SIZE - 1) >> PAGE_SHIFT;
	494	}
0110ee15	495
3a1556e8 TM	496	/*
	497	* Convert a struct timespec into a 64-bit change attribute
	498	*
	499	* This does approximately the same thing as timespec_to_ns(),
	500	* but for calculation efficiency, we multiply the seconds by
	501	* 102410241024.
	502	*/
	503	static inline
	504	u64 nfs_timespec_to_change_attr(const struct timespec *ts)
	505	{
	506	return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
	507	}