1 /*
2 * NFS internal definitions
3 */
4
5 #include <linux/mount.h>
6 #include <linux/security.h>
7
8 struct nfs_string;
9
10 /* Maximum number of readahead requests
11 * FIXME: this should really be a sysctl so that users may tune it to suit
12 * their needs. People that do NFS over a slow network, might for
13 * instance want to reduce it to something closer to 1 for improved
14 * interactive response.
15 */
16 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
17
18 struct nfs_clone_mount {
19 const struct super_block *sb;
20 const struct dentry *dentry;
21 struct nfs_fh *fh;
22 struct nfs_fattr *fattr;
23 char *hostname;
24 char *mnt_path;
25 struct sockaddr *addr;
26 size_t addrlen;
27 rpc_authflavor_t authflavor;
28 };
29
30 /*
31 * In-kernel mount arguments
32 */
33 struct nfs_parsed_mount_data {
34 int flags;
35 int rsize, wsize;
36 int timeo, retrans;
37 int acregmin, acregmax,
38 acdirmin, acdirmax;
39 int namlen;
40 unsigned int bsize;
41 unsigned int auth_flavor_len;
42 rpc_authflavor_t auth_flavors[1];
43 char *client_address;
44
45 struct {
46 struct sockaddr_storage address;
47 size_t addrlen;
48 char *hostname;
49 unsigned int version;
50 unsigned short port;
51 int protocol;
52 } mount_server;
53
54 struct {
55 struct sockaddr_storage address;
56 size_t addrlen;
57 char *hostname;
58 char *export_path;
59 int protocol;
60 } nfs_server;
61
62 struct security_mnt_opts lsm_opts;
63 };
64
65 /* client.c */
66 extern struct rpc_program nfs_program;
67
68 extern void nfs_put_client(struct nfs_client *);
69 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
70 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
71 extern struct nfs_server *nfs_create_server(
72 const struct nfs_parsed_mount_data *,
73 struct nfs_fh *);
74 extern struct nfs_server *nfs4_create_server(
75 const struct nfs_parsed_mount_data *,
76 struct nfs_fh *);
77 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
78 struct nfs_fh *);
79 extern void nfs_free_server(struct nfs_server *server);
80 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
81 struct nfs_fh *,
82 struct nfs_fattr *);
83 #ifdef CONFIG_PROC_FS
84 extern int __init nfs_fs_proc_init(void);
85 extern void nfs_fs_proc_exit(void);
86 #else
87 static inline int nfs_fs_proc_init(void)
88 {
89 return 0;
90 }
91 static inline void nfs_fs_proc_exit(void)
92 {
93 }
94 #endif
95
96 /* nfs4namespace.c */
97 #ifdef CONFIG_NFS_V4
98 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
99 #else
100 static inline
101 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
102 {
103 return ERR_PTR(-ENOENT);
104 }
105 #endif
106
107 /* callback_xdr.c */
108 extern struct svc_version nfs4_callback_version1;
109
110 /* pagelist.c */
111 extern int __init nfs_init_nfspagecache(void);
112 extern void nfs_destroy_nfspagecache(void);
113 extern int __init nfs_init_readpagecache(void);
114 extern void nfs_destroy_readpagecache(void);
115 extern int __init nfs_init_writepagecache(void);
116 extern void nfs_destroy_writepagecache(void);
117
118 #ifdef CONFIG_NFS_DIRECTIO
119 extern int __init nfs_init_directcache(void);
120 extern void nfs_destroy_directcache(void);
121 #else
122 #define nfs_init_directcache() (0)
123 #define nfs_destroy_directcache() do {} while(0)
124 #endif
125
126 /* nfs2xdr.c */
127 extern int nfs_stat_to_errno(int);
128 extern struct rpc_procinfo nfs_procedures[];
129 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
130
131 /* nfs3xdr.c */
132 extern struct rpc_procinfo nfs3_procedures[];
133 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
134
135 /* nfs4xdr.c */
136 #ifdef CONFIG_NFS_V4
137 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
138 #endif
139
140 /* nfs4proc.c */
141 #ifdef CONFIG_NFS_V4
142 extern struct rpc_procinfo nfs4_procedures[];
143 #endif
144
145 /* dir.c */
146 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
147
148 /* inode.c */
149 extern struct inode *nfs_alloc_inode(struct super_block *sb);
150 extern void nfs_destroy_inode(struct inode *);
151 extern int nfs_write_inode(struct inode *,int);
152 extern void nfs_clear_inode(struct inode *);
153 #ifdef CONFIG_NFS_V4
154 extern void nfs4_clear_inode(struct inode *);
155 #endif
156
157 /* super.c */
158 extern struct file_system_type nfs_xdev_fs_type;
159 #ifdef CONFIG_NFS_V4
160 extern struct file_system_type nfs4_xdev_fs_type;
161 extern struct file_system_type nfs4_referral_fs_type;
162 #endif
163
164 extern struct rpc_stat nfs_rpcstat;
165
166 extern int __init register_nfs_fs(void);
167 extern void __exit unregister_nfs_fs(void);
168 extern void nfs_sb_active(struct nfs_server *server);
169 extern void nfs_sb_deactive(struct nfs_server *server);
170
171 /* namespace.c */
172 extern char *nfs_path(const char *base,
173 const struct dentry *droot,
174 const struct dentry *dentry,
175 char *buffer, ssize_t buflen);
176
177 /* getroot.c */
178 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
179 #ifdef CONFIG_NFS_V4
180 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
181
182 extern int nfs4_path_walk(struct nfs_server *server,
183 struct nfs_fh *mntfh,
184 const char *path);
185 #endif
186
187 /*
188 * Determine the device name as a string
189 */
190 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
191 const struct dentry *dentry,
192 char *buffer, ssize_t buflen)
193 {
194 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
195 dentry, buffer, buflen);
196 }
197
198 /*
199 * Determine the actual block size (and log2 thereof)
200 */
201 static inline
202 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
203 {
204 /* make sure blocksize is a power of two */
205 if ((bsize & (bsize - 1)) || nrbitsp) {
206 unsigned char nrbits;
207
208 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
209 ;
210 bsize = 1 << nrbits;
211 if (nrbitsp)
212 *nrbitsp = nrbits;
213 }
214
215 return bsize;
216 }
217
218 /*
219 * Calculate the number of 512byte blocks used.
220 */
221 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
222 {
223 blkcnt_t used = (tsize + 511) >> 9;
224 return (used > ULONG_MAX) ? ULONG_MAX : used;
225 }
226
227 /*
228 * Compute and set NFS server blocksize
229 */
230 static inline
231 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
232 {
233 if (bsize < NFS_MIN_FILE_IO_SIZE)
234 bsize = NFS_DEF_FILE_IO_SIZE;
235 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
236 bsize = NFS_MAX_FILE_IO_SIZE;
237
238 return nfs_block_bits(bsize, nrbitsp);
239 }
240
241 /*
242 * Determine the maximum file size for a superblock
243 */
244 static inline
245 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
246 {
247 sb->s_maxbytes = (loff_t)maxfilesize;
248 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
249 sb->s_maxbytes = MAX_LFS_FILESIZE;
250 }
251
252 /*
253 * Determine the number of bytes of data the page contains
254 */
255 static inline
256 unsigned int nfs_page_length(struct page *page)
257 {
258 loff_t i_size = i_size_read(page->mapping->host);
259
260 if (i_size > 0) {
261 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
262 if (page->index < end_index)
263 return PAGE_CACHE_SIZE;
264 if (page->index == end_index)
265 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
266 }
267 return 0;
268 }
269
270 /*
271 * Determine the number of pages in an array of length 'len' and
272 * with a base offset of 'base'
273 */
274 static inline
275 unsigned int nfs_page_array_len(unsigned int base, size_t len)
276 {
277 return ((unsigned long)len + (unsigned long)base +
278 PAGE_SIZE - 1) >> PAGE_SHIFT;
279 }
280
281
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