[deliverable/linux.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;
}

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;
};

/*
 * 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		minorversion;
	char			*fscache_uniq;

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

	struct {
		struct sockaddr_storage	address;
		size_t			addrlen;
		char			*hostname;
		char			*export_path;
		unsigned short		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;
};

extern int nfs_mount(struct nfs_mount_request *info);

/* 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 *, u32);
extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
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);
#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);

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

/* 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);

/* nfs4proc.c */
static inline void nfs4_restart_rpc(struct rpc_task *task,
				    const struct nfs_client *clp)
{
#ifdef CONFIG_NFS_V4_1
	if (nfs4_has_session(clp) &&
	    test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
		rpc_restart_call_prepare(task);
		return;
	}
#endif /* CONFIG_NFS_V4_1 */
	rpc_restart_call(task);
}

/* 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

/* proc.c */
void nfs_close_context(struct nfs_open_context *ctx, int is_sync);

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

/* 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 *,int);
extern void nfs_clear_inode(struct inode *);
#ifdef CONFIG_NFS_V4
extern void nfs4_clear_inode(struct inode *);
#endif
void nfs_zap_acl_cache(struct inode *inode);
extern int nfs_wait_bit_killable(void *word);

/* super.c */
void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
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(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

/* read.c */
extern void nfs_read_prepare(struct rpc_task *task, void *calldata);

/* write.c */
extern void nfs_write_prepare(struct rpc_task *task, void *calldata);

/* nfs4proc.c */
extern int _nfs4_call_sync(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 nfs_server *server,
				   struct rpc_message *msg,
				   struct nfs4_sequence_args *args,
				   struct nfs4_sequence_res *res,
				   int cache_reply);

#ifdef CONFIG_NFS_V4_1
extern void nfs41_sequence_free_slot(const struct nfs_client *,
				     struct nfs4_sequence_res *res);
#endif /* CONFIG_NFS_V4_1 */

static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
					   struct nfs4_sequence_res *res)
{
#ifdef CONFIG_NFS_V4_1
	if (nfs4_has_session(clp))
		nfs41_sequence_free_slot(clp, res);
#endif /* CONFIG_NFS_V4_1 */
}

/*
 * 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 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;
}

/*
 * 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;
}

#define IPV6_SCOPE_DELIMITER	'%'

/*
 * Set the port number in an address.  Be agnostic about the address
 * family.
 */
static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
{
	struct sockaddr_in *ap = (struct sockaddr_in *)sap;
	struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;

	switch (sap->sa_family) {
	case AF_INET:
		ap->sin_port = htons(port);
		break;
	case AF_INET6:
		ap6->sin6_port = htons(port);
		break;
	}
}
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
f7b422b1 DH	33	struct nfs_clone_mount {
	34	const struct super_block *sb;
	35	const struct dentry *dentry;
	36	struct nfs_fh *fh;
	37	struct nfs_fattr *fattr;
	38	char *hostname;
	39	char *mnt_path;
6677d095 CL	40	struct sockaddr *addr;
6677d095 CL	41	size_t addrlen;
f7b422b1 DH	42	rpc_authflavor_t authflavor;
	43	};
	44
6b18eaa0 TT	45	/*
	46	* In-kernel mount arguments
	47	*/
	48	struct nfs_parsed_mount_data {
	49	int flags;
	50	int rsize, wsize;
	51	int timeo, retrans;
	52	int acregmin, acregmax,
	53	acdirmin, acdirmax;
	54	int namlen;
b797cac7	55	unsigned int options;
6b18eaa0 TT	56	unsigned int bsize;
	57	unsigned int auth_flavor_len;
	58	rpc_authflavor_t auth_flavors[1];
	59	char *client_address;
3fd5be9e	60	unsigned int minorversion;
08734048	61	char *fscache_uniq;
6b18eaa0 TT	62
6b18eaa0 TT	63	struct {
4c568017 CL	64	struct sockaddr_storage address;
4c568017 CL	65	size_t addrlen;
6b18eaa0	66	char *hostname;
78fa701f	67	u32 version;
6b18eaa0	68	unsigned short port;
78fa701f	69	unsigned short protocol;
6b18eaa0 TT	70	} mount_server;
	71
	72	struct {
4c568017 CL	73	struct sockaddr_storage address;
4c568017 CL	74	size_t addrlen;
6b18eaa0 TT	75	char *hostname;
6b18eaa0 TT	76	char *export_path;
f22d6d79	77	unsigned short port;
78fa701f	78	unsigned short protocol;
6b18eaa0	79	} nfs_server;
f9c3a380 EP	80
f9c3a380 EP	81	struct security_mnt_opts lsm_opts;
6b18eaa0 TT	82	};
6b18eaa0 TT	83
146ec944	84	/* mount_clnt.c */
c5d120f8 CL	85	struct nfs_mount_request {
	86	struct sockaddr *sap;
	87	size_t salen;
	88	char *hostname;
	89	char *dirpath;
	90	u32 version;
	91	unsigned short protocol;
	92	struct nfs_fh *fh;
50a737f8	93	int noresvport;
c5d120f8 CL	94	};
	95
	96	extern int nfs_mount(struct nfs_mount_request *info);
146ec944	97
24c8dbbb	98	/* client.c */
54ceac45 DH	99	extern struct rpc_program nfs_program;
54ceac45 DH	100
24c8dbbb	101	extern void nfs_put_client(struct nfs_client *);
ff052645	102	extern struct nfs_client nfs_find_client(const struct sockaddr , u32);
3fbd67ad	103	extern struct nfs_client nfs_find_client_next(struct nfs_client );
2283f8d6 TT	104	extern struct nfs_server *nfs_create_server(
	105	const struct nfs_parsed_mount_data *,
	106	struct nfs_fh *);
91ea40b9 TT	107	extern struct nfs_server *nfs4_create_server(
	108	const struct nfs_parsed_mount_data *,
	109	struct nfs_fh *);
54ceac45 DH	110	extern struct nfs_server nfs4_create_referral_server(struct nfs_clone_mount ,
	111	struct nfs_fh *);
	112	extern void nfs_free_server(struct nfs_server *server);
	113	extern struct nfs_server nfs_clone_server(struct nfs_server ,
	114	struct nfs_fh *,
	115	struct nfs_fattr *);
76db6d95	116	extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
6aaca566 DH	117	#ifdef CONFIG_PROC_FS
	118	extern int __init nfs_fs_proc_init(void);
	119	extern void nfs_fs_proc_exit(void);
	120	#else
	121	static inline int nfs_fs_proc_init(void)
	122	{
	123	return 0;
	124	}
	125	static inline void nfs_fs_proc_exit(void)
	126	{
	127	}
	128	#endif
24c8dbbb	129
7d4e2747	130	/* nfs4namespace.c */
f7b422b1 DH	131	#ifdef CONFIG_NFS_V4
	132	extern struct vfsmount nfs_do_refmount(const struct vfsmount mnt_parent, struct dentry *dentry);
	133	#else
	134	static inline
	135	struct vfsmount nfs_do_refmount(const struct vfsmount mnt_parent, struct dentry *dentry)
	136	{
	137	return ERR_PTR(-ENOENT);
	138	}
	139	#endif
	140
	141	/* callback_xdr.c */
	142	extern struct svc_version nfs4_callback_version1;
	143
	144	/* pagelist.c */
	145	extern int __init nfs_init_nfspagecache(void);
266bee88	146	extern void nfs_destroy_nfspagecache(void);
f7b422b1	147	extern int __init nfs_init_readpagecache(void);
266bee88	148	extern void nfs_destroy_readpagecache(void);
f7b422b1	149	extern int __init nfs_init_writepagecache(void);
266bee88	150	extern void nfs_destroy_writepagecache(void);
f7b422b1	151
f7b422b1	152	extern int __init nfs_init_directcache(void);
266bee88	153	extern void nfs_destroy_directcache(void);
f7b422b1 DH	154
f7b422b1 DH	155	/* nfs2xdr.c */
7d4e2747	156	extern int nfs_stat_to_errno(int);
f7b422b1	157	extern struct rpc_procinfo nfs_procedures[];
0dbb4c67	158	extern __be32 * nfs_decode_dirent(__be32 , struct nfs_entry , int);
f7b422b1 DH	159
	160	/* nfs3xdr.c */
	161	extern struct rpc_procinfo nfs3_procedures[];
0dbb4c67	162	extern __be32 nfs3_decode_dirent(__be32 , struct nfs_entry *, int);
f7b422b1	163
eedc020e AA	164	/* nfs4proc.c */
	165	static inline void nfs4_restart_rpc(struct rpc_task *task,
	166	const struct nfs_client *clp)
	167	{
	168	#ifdef CONFIG_NFS_V4_1
	169	if (nfs4_has_session(clp) &&
	170	test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
	171	rpc_restart_call_prepare(task);
	172	return;
	173	}
	174	#endif /* CONFIG_NFS_V4_1 */
	175	rpc_restart_call(task);
	176	}
	177
f7b422b1	178	/* nfs4xdr.c */
7d4e2747	179	#ifdef CONFIG_NFS_V4
0dbb4c67	180	extern __be32 nfs4_decode_dirent(__be32 p, struct nfs_entry *entry, int plus);
7d4e2747	181	#endif
f7b422b1 DH	182
f7b422b1 DH	183	/* nfs4proc.c */
d75d5414	184	#ifdef CONFIG_NFS_V4
f7b422b1	185	extern struct rpc_procinfo nfs4_procedures[];
d75d5414	186	#endif
f7b422b1	187
7fe5c398 TM	188	/* proc.c */
	189	void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
	190
979df72e TM	191	/* dir.c */
	192	extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
	193
f7b422b1	194	/* inode.c */
5746006f	195	extern struct workqueue_struct *nfsiod_workqueue;
f7b422b1 DH	196	extern struct inode nfs_alloc_inode(struct super_block sb);
	197	extern void nfs_destroy_inode(struct inode *);
	198	extern int nfs_write_inode(struct inode *,int);
	199	extern void nfs_clear_inode(struct inode *);
	200	#ifdef CONFIG_NFS_V4
	201	extern void nfs4_clear_inode(struct inode *);
	202	#endif
f41f7418	203	void nfs_zap_acl_cache(struct inode *inode);
72cb77f4	204	extern int nfs_wait_bit_killable(void *word);
f7b422b1 DH	205
f7b422b1 DH	206	/* super.c */
ea31a443	207	void nfs_parse_ip_address(char , size_t, struct sockaddr , size_t *);
54ceac45	208	extern struct file_system_type nfs_xdev_fs_type;
f7b422b1	209	#ifdef CONFIG_NFS_V4
54ceac45 DH	210	extern struct file_system_type nfs4_xdev_fs_type;
54ceac45 DH	211	extern struct file_system_type nfs4_referral_fs_type;
f7b422b1	212	#endif
4ebd9ab3	213
f7b422b1	214	extern struct rpc_stat nfs_rpcstat;
4ebd9ab3	215
f7b422b1 DH	216	extern int __init register_nfs_fs(void);
f7b422b1 DH	217	extern void __exit unregister_nfs_fs(void);
1daef0a8 TM	218	extern void nfs_sb_active(struct super_block *sb);
1daef0a8 TM	219	extern void nfs_sb_deactive(struct super_block *sb);
f7b422b1 DH	220
f7b422b1 DH	221	/* namespace.c */
54ceac45 DH	222	extern char nfs_path(const char base,
	223	const struct dentry *droot,
	224	const struct dentry *dentry,
f7b422b1 DH	225	char *buffer, ssize_t buflen);
f7b422b1 DH	226
54ceac45 DH	227	/* getroot.c */
54ceac45 DH	228	extern struct dentry nfs_get_root(struct super_block , struct nfs_fh *);
7d4e2747	229	#ifdef CONFIG_NFS_V4
54ceac45 DH	230	extern struct dentry nfs4_get_root(struct super_block , struct nfs_fh *);
	231
	232	extern int nfs4_path_walk(struct nfs_server *server,
	233	struct nfs_fh *mntfh,
	234	const char *path);
7d4e2747	235	#endif
f7b422b1	236
f11c88af AA	237	/* read.c */
	238	extern void nfs_read_prepare(struct rpc_task task, void calldata);
	239
def6ed7e AA	240	/* write.c */
	241	extern void nfs_write_prepare(struct rpc_task task, void calldata);
	242
cccef3b9 AA	243	/* nfs4proc.c */
	244	extern int _nfs4_call_sync(struct nfs_server *server,
	245	struct rpc_message *msg,
	246	struct nfs4_sequence_args *args,
	247	struct nfs4_sequence_res *res,
	248	int cache_reply);
	249	extern int _nfs4_call_sync_session(struct nfs_server *server,
	250	struct rpc_message *msg,
	251	struct nfs4_sequence_args *args,
	252	struct nfs4_sequence_res *res,
	253	int cache_reply);
	254
13615871 AA	255	#ifdef CONFIG_NFS_V4_1
	256	extern void nfs41_sequence_free_slot(const struct nfs_client *,
	257	struct nfs4_sequence_res *res);
	258	#endif /* CONFIG_NFS_V4_1 */
	259
	260	static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
	261	struct nfs4_sequence_res *res)
	262	{
	263	#ifdef CONFIG_NFS_V4_1
	264	if (nfs4_has_session(clp))
	265	nfs41_sequence_free_slot(clp, res);
	266	#endif /* CONFIG_NFS_V4_1 */
	267	}
	268
f7b422b1 DH	269	/*
	270	* Determine the device name as a string
	271	*/
	272	static inline char nfs_devname(const struct vfsmount mnt_parent,
54ceac45 DH	273	const struct dentry *dentry,
54ceac45 DH	274	char *buffer, ssize_t buflen)
f7b422b1	275	{
54ceac45 DH	276	return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
54ceac45 DH	277	dentry, buffer, buflen);
f7b422b1 DH	278	}
	279
	280	/*
	281	* Determine the actual block size (and log2 thereof)
	282	*/
	283	static inline
	284	unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
	285	{
	286	/* make sure blocksize is a power of two */
	287	if ((bsize & (bsize - 1)) \|\| nrbitsp) {
	288	unsigned char nrbits;
	289
	290	for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
	291	;
	292	bsize = 1 << nrbits;
	293	if (nrbitsp)
	294	*nrbitsp = nrbits;
	295	}
	296
	297	return bsize;
	298	}
	299
	300	/*
	301	* Calculate the number of 512byte blocks used.
	302	*/
9eaa67c6	303	static inline blkcnt_t nfs_calc_block_size(u64 tsize)
f7b422b1	304	{
9eaa67c6	305	blkcnt_t used = (tsize + 511) >> 9;
f7b422b1 DH	306	return (used > ULONG_MAX) ? ULONG_MAX : used;
	307	}
	308
	309	/*
	310	* Compute and set NFS server blocksize
	311	*/
	312	static inline
	313	unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
	314	{
	315	if (bsize < NFS_MIN_FILE_IO_SIZE)
	316	bsize = NFS_DEF_FILE_IO_SIZE;
	317	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
	318	bsize = NFS_MAX_FILE_IO_SIZE;
	319
	320	return nfs_block_bits(bsize, nrbitsp);
	321	}
	322
	323	/*
	324	* Determine the maximum file size for a superblock
	325	*/
	326	static inline
	327	void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
	328	{
	329	sb->s_maxbytes = (loff_t)maxfilesize;
	330	if (sb->s_maxbytes > MAX_LFS_FILESIZE \|\| sb->s_maxbytes <= 0)
	331	sb->s_maxbytes = MAX_LFS_FILESIZE;
	332	}
49a70f27 TM	333
	334	/*
	335	* Determine the number of bytes of data the page contains
	336	*/
	337	static inline
	338	unsigned int nfs_page_length(struct page *page)
	339	{
	340	loff_t i_size = i_size_read(page->mapping->host);
	341
	342	if (i_size > 0) {
	343	pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
	344	if (page->index < end_index)
	345	return PAGE_CACHE_SIZE;
	346	if (page->index == end_index)
	347	return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
	348	}
	349	return 0;
	350	}
8d5658c9 TM	351
	352	/*
	353	* Determine the number of pages in an array of length 'len' and
	354	* with a base offset of 'base'
	355	*/
	356	static inline
	357	unsigned int nfs_page_array_len(unsigned int base, size_t len)
	358	{
	359	return ((unsigned long)len + (unsigned long)base +
	360	PAGE_SIZE - 1) >> PAGE_SHIFT;
	361	}
	362
ea31a443	363	#define IPV6_SCOPE_DELIMITER '%'
f0c92925 BF	364
	365	/*
	366	* Set the port number in an address. Be agnostic about the address
	367	* family.
	368	*/
	369	static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
	370	{
456018d7 BF	371	struct sockaddr_in ap = (struct sockaddr_in )sap;
	372	struct sockaddr_in6 ap6 = (struct sockaddr_in6 )sap;
	373
f0c92925	374	switch (sap->sa_family) {
456018d7 BF	375	case AF_INET:
	376	ap->sin_port = htons(port);
	377	break;
	378	case AF_INET6:
	379	ap6->sin6_port = htons(port);
	380	break;
f0c92925 BF	381	}
f0c92925 BF	382	}