[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;
}

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)

/*
 * 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;
	unsigned int		*auth_flav_len;
	rpc_authflavor_t	*auth_flavs;
};

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);
extern int nfs4_check_client_ready(struct nfs_client *clp);
#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
a14017db CL	45	/*
	46	* Note: RFC 1813 doesn't limit the number of auth flavors that
	47	* a server can return, so make something up.
	48	*/
	49	#define NFS_MAX_SECFLAVORS (12)
	50
6b18eaa0 TT	51	/*
	52	* In-kernel mount arguments
	53	*/
	54	struct nfs_parsed_mount_data {
	55	int flags;
	56	int rsize, wsize;
	57	int timeo, retrans;
	58	int acregmin, acregmax,
	59	acdirmin, acdirmax;
	60	int namlen;
b797cac7	61	unsigned int options;
6b18eaa0 TT	62	unsigned int bsize;
	63	unsigned int auth_flavor_len;
	64	rpc_authflavor_t auth_flavors[1];
	65	char *client_address;
3fd5be9e	66	unsigned int minorversion;
08734048	67	char *fscache_uniq;
6b18eaa0 TT	68
6b18eaa0 TT	69	struct {
4c568017 CL	70	struct sockaddr_storage address;
4c568017 CL	71	size_t addrlen;
6b18eaa0	72	char *hostname;
78fa701f	73	u32 version;
6b18eaa0	74	unsigned short port;
78fa701f	75	unsigned short protocol;
6b18eaa0 TT	76	} mount_server;
	77
	78	struct {
4c568017 CL	79	struct sockaddr_storage address;
4c568017 CL	80	size_t addrlen;
6b18eaa0 TT	81	char *hostname;
6b18eaa0 TT	82	char *export_path;
f22d6d79	83	unsigned short port;
78fa701f	84	unsigned short protocol;
6b18eaa0	85	} nfs_server;
f9c3a380 EP	86
f9c3a380 EP	87	struct security_mnt_opts lsm_opts;
6b18eaa0 TT	88	};
6b18eaa0 TT	89
146ec944	90	/* mount_clnt.c */
c5d120f8 CL	91	struct nfs_mount_request {
	92	struct sockaddr *sap;
	93	size_t salen;
	94	char *hostname;
	95	char *dirpath;
	96	u32 version;
	97	unsigned short protocol;
	98	struct nfs_fh *fh;
50a737f8	99	int noresvport;
8e02f6b9 CL	100	unsigned int *auth_flav_len;
8e02f6b9 CL	101	rpc_authflavor_t *auth_flavs;
c5d120f8 CL	102	};
	103
	104	extern int nfs_mount(struct nfs_mount_request *info);
146ec944	105
24c8dbbb	106	/* client.c */
54ceac45 DH	107	extern struct rpc_program nfs_program;
54ceac45 DH	108
24c8dbbb	109	extern void nfs_put_client(struct nfs_client *);
ff052645	110	extern struct nfs_client nfs_find_client(const struct sockaddr , u32);
3fbd67ad	111	extern struct nfs_client nfs_find_client_next(struct nfs_client );
2283f8d6 TT	112	extern struct nfs_server *nfs_create_server(
	113	const struct nfs_parsed_mount_data *,
	114	struct nfs_fh *);
91ea40b9 TT	115	extern struct nfs_server *nfs4_create_server(
	116	const struct nfs_parsed_mount_data *,
	117	struct nfs_fh *);
54ceac45 DH	118	extern struct nfs_server nfs4_create_referral_server(struct nfs_clone_mount ,
	119	struct nfs_fh *);
	120	extern void nfs_free_server(struct nfs_server *server);
	121	extern struct nfs_server nfs_clone_server(struct nfs_server ,
	122	struct nfs_fh *,
	123	struct nfs_fattr *);
76db6d95	124	extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
008f55d0	125	extern int nfs4_check_client_ready(struct nfs_client *clp);
6aaca566 DH	126	#ifdef CONFIG_PROC_FS
	127	extern int __init nfs_fs_proc_init(void);
	128	extern void nfs_fs_proc_exit(void);
	129	#else
	130	static inline int nfs_fs_proc_init(void)
	131	{
	132	return 0;
	133	}
	134	static inline void nfs_fs_proc_exit(void)
	135	{
	136	}
	137	#endif
24c8dbbb	138
7d4e2747	139	/* nfs4namespace.c */
f7b422b1 DH	140	#ifdef CONFIG_NFS_V4
	141	extern struct vfsmount nfs_do_refmount(const struct vfsmount mnt_parent, struct dentry *dentry);
	142	#else
	143	static inline
	144	struct vfsmount nfs_do_refmount(const struct vfsmount mnt_parent, struct dentry *dentry)
	145	{
	146	return ERR_PTR(-ENOENT);
	147	}
	148	#endif
	149
	150	/* callback_xdr.c */
	151	extern struct svc_version nfs4_callback_version1;
	152
	153	/* pagelist.c */
	154	extern int __init nfs_init_nfspagecache(void);
266bee88	155	extern void nfs_destroy_nfspagecache(void);
f7b422b1	156	extern int __init nfs_init_readpagecache(void);
266bee88	157	extern void nfs_destroy_readpagecache(void);
f7b422b1	158	extern int __init nfs_init_writepagecache(void);
266bee88	159	extern void nfs_destroy_writepagecache(void);
f7b422b1	160
f7b422b1	161	extern int __init nfs_init_directcache(void);
266bee88	162	extern void nfs_destroy_directcache(void);
f7b422b1 DH	163
f7b422b1 DH	164	/* nfs2xdr.c */
7d4e2747	165	extern int nfs_stat_to_errno(int);
f7b422b1	166	extern struct rpc_procinfo nfs_procedures[];
0dbb4c67	167	extern __be32 * nfs_decode_dirent(__be32 , struct nfs_entry , int);
f7b422b1 DH	168
	169	/* nfs3xdr.c */
	170	extern struct rpc_procinfo nfs3_procedures[];
0dbb4c67	171	extern __be32 nfs3_decode_dirent(__be32 , struct nfs_entry *, int);
f7b422b1	172
eedc020e AA	173	/* nfs4proc.c */
	174	static inline void nfs4_restart_rpc(struct rpc_task *task,
	175	const struct nfs_client *clp)
	176	{
	177	#ifdef CONFIG_NFS_V4_1
	178	if (nfs4_has_session(clp) &&
	179	test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
	180	rpc_restart_call_prepare(task);
	181	return;
	182	}
	183	#endif /* CONFIG_NFS_V4_1 */
	184	rpc_restart_call(task);
	185	}
	186
f7b422b1	187	/* nfs4xdr.c */
7d4e2747	188	#ifdef CONFIG_NFS_V4
0dbb4c67	189	extern __be32 nfs4_decode_dirent(__be32 p, struct nfs_entry *entry, int plus);
7d4e2747	190	#endif
f7b422b1 DH	191
f7b422b1 DH	192	/* nfs4proc.c */
d75d5414	193	#ifdef CONFIG_NFS_V4
f7b422b1	194	extern struct rpc_procinfo nfs4_procedures[];
d75d5414	195	#endif
f7b422b1	196
7fe5c398 TM	197	/* proc.c */
	198	void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
	199
979df72e TM	200	/* dir.c */
	201	extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
	202
f7b422b1	203	/* inode.c */
5746006f	204	extern struct workqueue_struct *nfsiod_workqueue;
f7b422b1 DH	205	extern struct inode nfs_alloc_inode(struct super_block sb);
	206	extern void nfs_destroy_inode(struct inode *);
	207	extern int nfs_write_inode(struct inode *,int);
	208	extern void nfs_clear_inode(struct inode *);
	209	#ifdef CONFIG_NFS_V4
	210	extern void nfs4_clear_inode(struct inode *);
	211	#endif
f41f7418	212	void nfs_zap_acl_cache(struct inode *inode);
72cb77f4	213	extern int nfs_wait_bit_killable(void *word);
f7b422b1 DH	214
f7b422b1 DH	215	/* super.c */
ea31a443	216	void nfs_parse_ip_address(char , size_t, struct sockaddr , size_t *);
54ceac45	217	extern struct file_system_type nfs_xdev_fs_type;
f7b422b1	218	#ifdef CONFIG_NFS_V4
54ceac45 DH	219	extern struct file_system_type nfs4_xdev_fs_type;
54ceac45 DH	220	extern struct file_system_type nfs4_referral_fs_type;
f7b422b1	221	#endif
4ebd9ab3	222
f7b422b1	223	extern struct rpc_stat nfs_rpcstat;
4ebd9ab3	224
f7b422b1 DH	225	extern int __init register_nfs_fs(void);
f7b422b1 DH	226	extern void __exit unregister_nfs_fs(void);
1daef0a8 TM	227	extern void nfs_sb_active(struct super_block *sb);
1daef0a8 TM	228	extern void nfs_sb_deactive(struct super_block *sb);
f7b422b1 DH	229
f7b422b1 DH	230	/* namespace.c */
54ceac45 DH	231	extern char nfs_path(const char base,
	232	const struct dentry *droot,
	233	const struct dentry *dentry,
f7b422b1 DH	234	char *buffer, ssize_t buflen);
f7b422b1 DH	235
54ceac45 DH	236	/* getroot.c */
54ceac45 DH	237	extern struct dentry nfs_get_root(struct super_block , struct nfs_fh *);
7d4e2747	238	#ifdef CONFIG_NFS_V4
54ceac45 DH	239	extern struct dentry nfs4_get_root(struct super_block , struct nfs_fh *);
	240
	241	extern int nfs4_path_walk(struct nfs_server *server,
	242	struct nfs_fh *mntfh,
	243	const char *path);
7d4e2747	244	#endif
f7b422b1	245
f11c88af AA	246	/* read.c */
	247	extern void nfs_read_prepare(struct rpc_task task, void calldata);
	248
def6ed7e AA	249	/* write.c */
	250	extern void nfs_write_prepare(struct rpc_task task, void calldata);
	251
cccef3b9 AA	252	/* nfs4proc.c */
	253	extern int _nfs4_call_sync(struct nfs_server *server,
	254	struct rpc_message *msg,
	255	struct nfs4_sequence_args *args,
	256	struct nfs4_sequence_res *res,
	257	int cache_reply);
	258	extern int _nfs4_call_sync_session(struct nfs_server *server,
	259	struct rpc_message *msg,
	260	struct nfs4_sequence_args *args,
	261	struct nfs4_sequence_res *res,
	262	int cache_reply);
	263
13615871 AA	264	#ifdef CONFIG_NFS_V4_1
	265	extern void nfs41_sequence_free_slot(const struct nfs_client *,
	266	struct nfs4_sequence_res *res);
	267	#endif /* CONFIG_NFS_V4_1 */
	268
	269	static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
	270	struct nfs4_sequence_res *res)
	271	{
	272	#ifdef CONFIG_NFS_V4_1
	273	if (nfs4_has_session(clp))
	274	nfs41_sequence_free_slot(clp, res);
	275	#endif /* CONFIG_NFS_V4_1 */
	276	}
	277
f7b422b1 DH	278	/*
	279	* Determine the device name as a string
	280	*/
	281	static inline char nfs_devname(const struct vfsmount mnt_parent,
54ceac45 DH	282	const struct dentry *dentry,
54ceac45 DH	283	char *buffer, ssize_t buflen)
f7b422b1	284	{
54ceac45 DH	285	return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
54ceac45 DH	286	dentry, buffer, buflen);
f7b422b1 DH	287	}
	288
	289	/*
	290	* Determine the actual block size (and log2 thereof)
	291	*/
	292	static inline
	293	unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
	294	{
	295	/* make sure blocksize is a power of two */
	296	if ((bsize & (bsize - 1)) \|\| nrbitsp) {
	297	unsigned char nrbits;
	298
	299	for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
	300	;
	301	bsize = 1 << nrbits;
	302	if (nrbitsp)
	303	*nrbitsp = nrbits;
	304	}
	305
	306	return bsize;
	307	}
	308
	309	/*
	310	* Calculate the number of 512byte blocks used.
	311	*/
9eaa67c6	312	static inline blkcnt_t nfs_calc_block_size(u64 tsize)
f7b422b1	313	{
9eaa67c6	314	blkcnt_t used = (tsize + 511) >> 9;
f7b422b1 DH	315	return (used > ULONG_MAX) ? ULONG_MAX : used;
	316	}
	317
	318	/*
	319	* Compute and set NFS server blocksize
	320	*/
	321	static inline
	322	unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
	323	{
	324	if (bsize < NFS_MIN_FILE_IO_SIZE)
	325	bsize = NFS_DEF_FILE_IO_SIZE;
	326	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
	327	bsize = NFS_MAX_FILE_IO_SIZE;
	328
	329	return nfs_block_bits(bsize, nrbitsp);
	330	}
	331
	332	/*
	333	* Determine the maximum file size for a superblock
	334	*/
	335	static inline
	336	void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
	337	{
	338	sb->s_maxbytes = (loff_t)maxfilesize;
	339	if (sb->s_maxbytes > MAX_LFS_FILESIZE \|\| sb->s_maxbytes <= 0)
	340	sb->s_maxbytes = MAX_LFS_FILESIZE;
	341	}
49a70f27 TM	342
	343	/*
	344	* Determine the number of bytes of data the page contains
	345	*/
	346	static inline
	347	unsigned int nfs_page_length(struct page *page)
	348	{
	349	loff_t i_size = i_size_read(page->mapping->host);
	350
	351	if (i_size > 0) {
	352	pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
	353	if (page->index < end_index)
	354	return PAGE_CACHE_SIZE;
	355	if (page->index == end_index)
	356	return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
	357	}
	358	return 0;
	359	}
8d5658c9 TM	360
	361	/*
	362	* Determine the number of pages in an array of length 'len' and
	363	* with a base offset of 'base'
	364	*/
	365	static inline
	366	unsigned int nfs_page_array_len(unsigned int base, size_t len)
	367	{
	368	return ((unsigned long)len + (unsigned long)base +
	369	PAGE_SIZE - 1) >> PAGE_SHIFT;
	370	}
	371
ea31a443	372	#define IPV6_SCOPE_DELIMITER '%'
f0c92925 BF	373
	374	/*
	375	* Set the port number in an address. Be agnostic about the address
	376	* family.
	377	*/
	378	static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
	379	{
456018d7 BF	380	struct sockaddr_in ap = (struct sockaddr_in )sap;
	381	struct sockaddr_in6 ap6 = (struct sockaddr_in6 )sap;
	382
f0c92925	383	switch (sap->sa_family) {
456018d7 BF	384	case AF_INET:
	385	ap->sin_port = htons(port);
	386	break;
	387	case AF_INET6:
	388	ap6->sin6_port = htons(port);
	389	break;
f0c92925 BF	390	}
f0c92925 BF	391	}