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