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David Howellsf7b422b2006-06-09 09:34:33 -04001/*
2 * NFS internal definitions
3 */
4
5#include <linux/mount.h>
6
David Howells54ceac42006-08-22 20:06:13 -04007struct nfs_string;
8struct nfs_mount_data;
9struct 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
David Howellsf7b422b2006-06-09 09:34:33 -040019struct 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
David Howells24c8dbb2006-08-22 20:06:10 -040030/* client.c */
David Howells54ceac42006-08-22 20:06:13 -040031extern struct rpc_program nfs_program;
32
David Howells24c8dbb2006-08-22 20:06:10 -040033extern void nfs_put_client(struct nfs_client *);
34extern struct nfs_client *nfs_find_client(const struct sockaddr_in *, int);
David Howells54ceac42006-08-22 20:06:13 -040035extern struct nfs_server *nfs_create_server(const struct nfs_mount_data *,
36 struct nfs_fh *);
37extern 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 *);
44extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
45 struct nfs_fh *);
46extern void nfs_free_server(struct nfs_server *server);
47extern struct nfs_server *nfs_clone_server(struct nfs_server *,
48 struct nfs_fh *,
49 struct nfs_fattr *);
David Howells6aaca562006-08-22 20:06:13 -040050#ifdef CONFIG_PROC_FS
51extern int __init nfs_fs_proc_init(void);
52extern void nfs_fs_proc_exit(void);
53#else
54static inline int nfs_fs_proc_init(void)
55{
56 return 0;
57}
58static inline void nfs_fs_proc_exit(void)
59{
60}
61#endif
David Howells24c8dbb2006-08-22 20:06:10 -040062
David Howells7d4e2742006-08-22 20:06:07 -040063/* nfs4namespace.c */
David Howellsf7b422b2006-06-09 09:34:33 -040064#ifdef CONFIG_NFS_V4
65extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
66#else
67static inline
68struct 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 */
75extern struct svc_version nfs4_callback_version1;
76
77/* pagelist.c */
78extern int __init nfs_init_nfspagecache(void);
David Brownell266bee82006-06-27 12:59:15 -070079extern void nfs_destroy_nfspagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -040080extern int __init nfs_init_readpagecache(void);
David Brownell266bee82006-06-27 12:59:15 -070081extern void nfs_destroy_readpagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -040082extern int __init nfs_init_writepagecache(void);
David Brownell266bee82006-06-27 12:59:15 -070083extern void nfs_destroy_writepagecache(void);
David Howellsf7b422b2006-06-09 09:34:33 -040084
85#ifdef CONFIG_NFS_DIRECTIO
86extern int __init nfs_init_directcache(void);
David Brownell266bee82006-06-27 12:59:15 -070087extern void nfs_destroy_directcache(void);
David Howellsf7b422b2006-06-09 09:34:33 -040088#else
89#define nfs_init_directcache() (0)
90#define nfs_destroy_directcache() do {} while(0)
91#endif
92
93/* nfs2xdr.c */
David Howells7d4e2742006-08-22 20:06:07 -040094extern int nfs_stat_to_errno(int);
David Howellsf7b422b2006-06-09 09:34:33 -040095extern struct rpc_procinfo nfs_procedures[];
Al Viro0dbb4c62006-10-19 23:28:49 -070096extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
David Howellsf7b422b2006-06-09 09:34:33 -040097
98/* nfs3xdr.c */
99extern struct rpc_procinfo nfs3_procedures[];
Al Viro0dbb4c62006-10-19 23:28:49 -0700100extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
David Howellsf7b422b2006-06-09 09:34:33 -0400101
102/* nfs4xdr.c */
David Howells7d4e2742006-08-22 20:06:07 -0400103#ifdef CONFIG_NFS_V4
Al Viro0dbb4c62006-10-19 23:28:49 -0700104extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
David Howells7d4e2742006-08-22 20:06:07 -0400105#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400106
107/* nfs4proc.c */
Andrew Mortond75d5412006-06-25 02:41:26 -0700108#ifdef CONFIG_NFS_V4
David Howellsf7b422b2006-06-09 09:34:33 -0400109extern struct rpc_procinfo nfs4_procedures[];
Andrew Mortond75d5412006-06-25 02:41:26 -0700110#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400111
Trond Myklebust979df722006-07-25 11:28:19 -0400112/* dir.c */
113extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
114
David Howellsf7b422b2006-06-09 09:34:33 -0400115/* inode.c */
116extern struct inode *nfs_alloc_inode(struct super_block *sb);
117extern void nfs_destroy_inode(struct inode *);
118extern int nfs_write_inode(struct inode *,int);
119extern void nfs_clear_inode(struct inode *);
120#ifdef CONFIG_NFS_V4
121extern void nfs4_clear_inode(struct inode *);
122#endif
123
124/* super.c */
David Howells54ceac42006-08-22 20:06:13 -0400125extern struct file_system_type nfs_xdev_fs_type;
David Howellsf7b422b2006-06-09 09:34:33 -0400126#ifdef CONFIG_NFS_V4
David Howells54ceac42006-08-22 20:06:13 -0400127extern struct file_system_type nfs4_xdev_fs_type;
128extern struct file_system_type nfs4_referral_fs_type;
David Howellsf7b422b2006-06-09 09:34:33 -0400129#endif
Dominik Hackl4ebd9ab2006-07-02 17:29:26 +0200130
David Howellsf7b422b2006-06-09 09:34:33 -0400131extern struct rpc_stat nfs_rpcstat;
Dominik Hackl4ebd9ab2006-07-02 17:29:26 +0200132
David Howellsf7b422b2006-06-09 09:34:33 -0400133extern int __init register_nfs_fs(void);
134extern void __exit unregister_nfs_fs(void);
135
136/* namespace.c */
David Howells54ceac42006-08-22 20:06:13 -0400137extern char *nfs_path(const char *base,
138 const struct dentry *droot,
139 const struct dentry *dentry,
David Howellsf7b422b2006-06-09 09:34:33 -0400140 char *buffer, ssize_t buflen);
141
David Howells54ceac42006-08-22 20:06:13 -0400142/* getroot.c */
143extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
David Howells7d4e2742006-08-22 20:06:07 -0400144#ifdef CONFIG_NFS_V4
David Howells54ceac42006-08-22 20:06:13 -0400145extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
146
147extern int nfs4_path_walk(struct nfs_server *server,
148 struct nfs_fh *mntfh,
149 const char *path);
David Howells7d4e2742006-08-22 20:06:07 -0400150#endif
David Howellsf7b422b2006-06-09 09:34:33 -0400151
152/*
153 * Determine the device name as a string
154 */
155static inline char *nfs_devname(const struct vfsmount *mnt_parent,
David Howells54ceac42006-08-22 20:06:13 -0400156 const struct dentry *dentry,
157 char *buffer, ssize_t buflen)
David Howellsf7b422b2006-06-09 09:34:33 -0400158{
David Howells54ceac42006-08-22 20:06:13 -0400159 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
160 dentry, buffer, buflen);
David Howellsf7b422b2006-06-09 09:34:33 -0400161}
162
163/*
164 * Determine the actual block size (and log2 thereof)
165 */
166static inline
167unsigned 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 */
186static 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 */
195static inline
196unsigned 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 */
209static inline
210void 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}
Trond Myklebust49a70f22006-12-05 00:35:38 -0500216
217/*
218 * Determine the number of bytes of data the page contains
219 */
220static inline
221unsigned 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}
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400234
235/*
236 * Determine the number of pages in an array of length 'len' and
237 * with a base offset of 'base'
238 */
239static inline
240unsigned 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