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

/*
 * NFS internal definitions
 */

#include <linux/mount.h>

struct nfs_string;
struct nfs_mount_data;
struct nfs4_mount_data;

/* 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)

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_in *addr;
	rpc_authflavor_t authflavor;
};

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

extern void nfs_put_client(struct nfs_client *);
extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *,
					    struct nfs_fh *);
extern struct nfs_server *nfs4_create_server(const struct nfs4_mount_data *,
					     const char *,
					     const struct sockaddr_in *,
					     const char *,
					     const char *,
					     rpc_authflavor_t,
					     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 *);
#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(const struct vfsmount *mnt_parent, struct dentry *dentry);
#else
static inline
struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
{
	return ERR_PTR(-ENOENT);
}
#endif

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

/* 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);

#ifdef CONFIG_NFS_DIRECTIO
extern int __init nfs_init_directcache(void);
extern void nfs_destroy_directcache(void);
#else
#define nfs_init_directcache() (0)
#define nfs_destroy_directcache() do {} while(0)
#endif

/* nfs2xdr.c */
extern int nfs_stat_to_errno(int);
extern struct rpc_procinfo nfs_procedures[];
extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);

/* nfs3xdr.c */
extern struct rpc_procinfo nfs3_procedures[];
extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);

/* nfs4xdr.c */
#ifdef CONFIG_NFS_V4
extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
#endif

/* nfs4proc.c */
#ifdef CONFIG_NFS_V4
extern struct rpc_procinfo nfs4_procedures[];
#endif

/* dir.c */
extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);

/* inode.c */
extern struct inode *nfs_alloc_inode(struct super_block *sb);
extern void nfs_destroy_inode(struct inode *);
extern int nfs_write_inode(struct inode *,int);
extern void nfs_clear_inode(struct inode *);
#ifdef CONFIG_NFS_V4
extern void nfs4_clear_inode(struct inode *);
#endif

/* 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);

/* namespace.c */
extern char *nfs_path(const char *base,
		      const struct dentry *droot,
		      const struct dentry *dentry,
		      char *buffer, ssize_t buflen);

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

extern int nfs4_path_walk(struct nfs_server *server,
			  struct nfs_fh *mntfh,
			  const char *path);
#endif

/*
 * Determine the device name as a string
 */
static inline char *nfs_devname(const struct vfsmount *mnt_parent,
				const struct dentry *dentry,
				char *buffer, ssize_t buflen)
{
	return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
			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 unsigned long nfs_calc_block_size(u64 tsize)
{
	loff_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;
}

/*
 * 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;
}
Commit	Line	Data
f7b422b1 DH	1	/*
	2	* NFS internal definitions
	3	*/
	4
	5	#include <linux/mount.h>
	6
54ceac45 DH	7	struct nfs_string;
	8	struct nfs_mount_data;
	9	struct nfs4_mount_data;
	10
	11	/* Maximum number of readahead requests
	12	* FIXME: this should really be a sysctl so that users may tune it to suit
	13	* their needs. People that do NFS over a slow network, might for
	14	* instance want to reduce it to something closer to 1 for improved
	15	* interactive response.
	16	*/
	17	#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
	18
f7b422b1 DH	19	struct nfs_clone_mount {
	20	const struct super_block *sb;
	21	const struct dentry *dentry;
	22	struct nfs_fh *fh;
	23	struct nfs_fattr *fattr;
	24	char *hostname;
	25	char *mnt_path;
	26	struct sockaddr_in *addr;
	27	rpc_authflavor_t authflavor;
	28	};
	29
24c8dbbb	30	/* client.c */
54ceac45 DH	31	extern struct rpc_program nfs_program;
54ceac45 DH	32
24c8dbbb DH	33	extern void nfs_put_client(struct nfs_client *);
24c8dbbb DH	34	extern struct nfs_client nfs_find_client(const struct sockaddr_in , int);
54ceac45 DH	35	extern struct nfs_server nfs_create_server(const struct nfs_mount_data ,
	36	struct nfs_fh *);
	37	extern struct nfs_server nfs4_create_server(const struct nfs4_mount_data ,
	38	const char *,
	39	const struct sockaddr_in *,
	40	const char *,
	41	const char *,
	42	rpc_authflavor_t,
	43	struct nfs_fh *);
	44	extern struct nfs_server nfs4_create_referral_server(struct nfs_clone_mount ,
	45	struct nfs_fh *);
	46	extern void nfs_free_server(struct nfs_server *server);
	47	extern struct nfs_server nfs_clone_server(struct nfs_server ,
	48	struct nfs_fh *,
	49	struct nfs_fattr *);
6aaca566 DH	50	#ifdef CONFIG_PROC_FS
	51	extern int __init nfs_fs_proc_init(void);
	52	extern void nfs_fs_proc_exit(void);
	53	#else
	54	static inline int nfs_fs_proc_init(void)
	55	{
	56	return 0;
	57	}
	58	static inline void nfs_fs_proc_exit(void)
	59	{
	60	}
	61	#endif
24c8dbbb	62
7d4e2747	63	/* nfs4namespace.c */
f7b422b1 DH	64	#ifdef CONFIG_NFS_V4
	65	extern struct vfsmount nfs_do_refmount(const struct vfsmount mnt_parent, struct dentry *dentry);
	66	#else
	67	static inline
	68	struct vfsmount nfs_do_refmount(const struct vfsmount mnt_parent, struct dentry *dentry)
	69	{
	70	return ERR_PTR(-ENOENT);
	71	}
	72	#endif
	73
	74	/* callback_xdr.c */
	75	extern struct svc_version nfs4_callback_version1;
	76
	77	/* pagelist.c */
	78	extern int __init nfs_init_nfspagecache(void);
266bee88	79	extern void nfs_destroy_nfspagecache(void);
f7b422b1	80	extern int __init nfs_init_readpagecache(void);
266bee88	81	extern void nfs_destroy_readpagecache(void);
f7b422b1	82	extern int __init nfs_init_writepagecache(void);
266bee88	83	extern void nfs_destroy_writepagecache(void);
f7b422b1 DH	84
	85	#ifdef CONFIG_NFS_DIRECTIO
	86	extern int __init nfs_init_directcache(void);
266bee88	87	extern void nfs_destroy_directcache(void);
f7b422b1 DH	88	#else
	89	#define nfs_init_directcache() (0)
	90	#define nfs_destroy_directcache() do {} while(0)
	91	#endif
	92
	93	/* nfs2xdr.c */
7d4e2747	94	extern int nfs_stat_to_errno(int);
f7b422b1	95	extern struct rpc_procinfo nfs_procedures[];
0dbb4c67	96	extern __be32 * nfs_decode_dirent(__be32 , struct nfs_entry , int);
f7b422b1 DH	97
	98	/* nfs3xdr.c */
	99	extern struct rpc_procinfo nfs3_procedures[];
0dbb4c67	100	extern __be32 nfs3_decode_dirent(__be32 , struct nfs_entry *, int);
f7b422b1 DH	101
f7b422b1 DH	102	/* nfs4xdr.c */
7d4e2747	103	#ifdef CONFIG_NFS_V4
0dbb4c67	104	extern __be32 nfs4_decode_dirent(__be32 p, struct nfs_entry *entry, int plus);
7d4e2747	105	#endif
f7b422b1 DH	106
f7b422b1 DH	107	/* nfs4proc.c */
d75d5414	108	#ifdef CONFIG_NFS_V4
f7b422b1	109	extern struct rpc_procinfo nfs4_procedures[];
d75d5414	110	#endif
f7b422b1	111
979df72e TM	112	/* dir.c */
	113	extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
	114
f7b422b1 DH	115	/* inode.c */
	116	extern struct inode nfs_alloc_inode(struct super_block sb);
	117	extern void nfs_destroy_inode(struct inode *);
	118	extern int nfs_write_inode(struct inode *,int);
	119	extern void nfs_clear_inode(struct inode *);
	120	#ifdef CONFIG_NFS_V4
	121	extern void nfs4_clear_inode(struct inode *);
	122	#endif
	123
	124	/* super.c */
54ceac45	125	extern struct file_system_type nfs_xdev_fs_type;
f7b422b1	126	#ifdef CONFIG_NFS_V4
54ceac45 DH	127	extern struct file_system_type nfs4_xdev_fs_type;
54ceac45 DH	128	extern struct file_system_type nfs4_referral_fs_type;
f7b422b1	129	#endif
4ebd9ab3	130
f7b422b1	131	extern struct rpc_stat nfs_rpcstat;
4ebd9ab3	132
f7b422b1 DH	133	extern int __init register_nfs_fs(void);
	134	extern void __exit unregister_nfs_fs(void);
	135
	136	/* namespace.c */
54ceac45 DH	137	extern char nfs_path(const char base,
	138	const struct dentry *droot,
	139	const struct dentry *dentry,
f7b422b1 DH	140	char *buffer, ssize_t buflen);
f7b422b1 DH	141
54ceac45 DH	142	/* getroot.c */
54ceac45 DH	143	extern struct dentry nfs_get_root(struct super_block , struct nfs_fh *);
7d4e2747	144	#ifdef CONFIG_NFS_V4
54ceac45 DH	145	extern struct dentry nfs4_get_root(struct super_block , struct nfs_fh *);
	146
	147	extern int nfs4_path_walk(struct nfs_server *server,
	148	struct nfs_fh *mntfh,
	149	const char *path);
7d4e2747	150	#endif
f7b422b1 DH	151
	152	/*
	153	* Determine the device name as a string
	154	*/
	155	static inline char nfs_devname(const struct vfsmount mnt_parent,
54ceac45 DH	156	const struct dentry *dentry,
54ceac45 DH	157	char *buffer, ssize_t buflen)
f7b422b1	158	{
54ceac45 DH	159	return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
54ceac45 DH	160	dentry, buffer, buflen);
f7b422b1 DH	161	}
	162
	163	/*
	164	* Determine the actual block size (and log2 thereof)
	165	*/
	166	static inline
	167	unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
	168	{
	169	/* make sure blocksize is a power of two */
	170	if ((bsize & (bsize - 1)) \|\| nrbitsp) {
	171	unsigned char nrbits;
	172
	173	for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
	174	;
	175	bsize = 1 << nrbits;
	176	if (nrbitsp)
	177	*nrbitsp = nrbits;
	178	}
	179
	180	return bsize;
	181	}
	182
	183	/*
	184	* Calculate the number of 512byte blocks used.
	185	*/
	186	static inline unsigned long nfs_calc_block_size(u64 tsize)
	187	{
	188	loff_t used = (tsize + 511) >> 9;
	189	return (used > ULONG_MAX) ? ULONG_MAX : used;
	190	}
	191
	192	/*
	193	* Compute and set NFS server blocksize
	194	*/
	195	static inline
	196	unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
	197	{
	198	if (bsize < NFS_MIN_FILE_IO_SIZE)
	199	bsize = NFS_DEF_FILE_IO_SIZE;
	200	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
	201	bsize = NFS_MAX_FILE_IO_SIZE;
	202
	203	return nfs_block_bits(bsize, nrbitsp);
	204	}
	205
	206	/*
	207	* Determine the maximum file size for a superblock
	208	*/
	209	static inline
	210	void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
	211	{
	212	sb->s_maxbytes = (loff_t)maxfilesize;
	213	if (sb->s_maxbytes > MAX_LFS_FILESIZE \|\| sb->s_maxbytes <= 0)
	214	sb->s_maxbytes = MAX_LFS_FILESIZE;
	215	}
49a70f27 TM	216
	217	/*
	218	* Determine the number of bytes of data the page contains
	219	*/
	220	static inline
	221	unsigned int nfs_page_length(struct page *page)
	222	{
	223	loff_t i_size = i_size_read(page->mapping->host);
	224
	225	if (i_size > 0) {
	226	pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
	227	if (page->index < end_index)
	228	return PAGE_CACHE_SIZE;
	229	if (page->index == end_index)
	230	return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
	231	}
	232	return 0;
	233	}
8d5658c9 TM	234
	235	/*
	236	* Determine the number of pages in an array of length 'len' and
	237	* with a base offset of 'base'
	238	*/
	239	static inline
	240	unsigned int nfs_page_array_len(unsigned int base, size_t len)
	241	{
	242	return ((unsigned long)len + (unsigned long)base +
	243	PAGE_SIZE - 1) >> PAGE_SHIFT;
	244	}
	245