2 * NFS internal definitions
5 #include <linux/mount.h>
6 #include <linux/security.h>
8 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
12 /* Maximum number of readahead requests
13 * FIXME: this should really be a sysctl so that users may tune it to suit
14 * their needs. People that do NFS over a slow network, might for
15 * instance want to reduce it to something closer to 1 for improved
16 * interactive response.
18 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
20 struct nfs_clone_mount {
21 const struct super_block *sb;
22 const struct dentry *dentry;
24 struct nfs_fattr *fattr;
27 struct sockaddr *addr;
29 rpc_authflavor_t authflavor;
33 * Note: RFC 1813 doesn't limit the number of auth flavors that
34 * a server can return, so make something up.
36 #define NFS_MAX_SECFLAVORS (12)
39 * In-kernel mount arguments
41 struct nfs_parsed_mount_data {
45 int acregmin, acregmax,
50 unsigned int auth_flavor_len;
51 rpc_authflavor_t auth_flavors[1];
56 struct sockaddr_storage address;
61 unsigned short protocol;
65 struct sockaddr_storage address;
70 unsigned short protocol;
73 struct security_mnt_opts lsm_opts;
77 struct nfs_mount_request {
83 unsigned short protocol;
88 extern int nfs_mount(struct nfs_mount_request *info);
91 extern struct rpc_program nfs_program;
93 extern void nfs_put_client(struct nfs_client *);
94 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
95 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
96 extern struct nfs_server *nfs_create_server(
97 const struct nfs_parsed_mount_data *,
99 extern struct nfs_server *nfs4_create_server(
100 const struct nfs_parsed_mount_data *,
102 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
104 extern void nfs_free_server(struct nfs_server *server);
105 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
108 #ifdef CONFIG_PROC_FS
109 extern int __init nfs_fs_proc_init(void);
110 extern void nfs_fs_proc_exit(void);
112 static inline int nfs_fs_proc_init(void)
116 static inline void nfs_fs_proc_exit(void)
121 /* nfs4namespace.c */
123 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
126 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
128 return ERR_PTR(-ENOENT);
133 extern struct svc_version nfs4_callback_version1;
136 extern int __init nfs_init_nfspagecache(void);
137 extern void nfs_destroy_nfspagecache(void);
138 extern int __init nfs_init_readpagecache(void);
139 extern void nfs_destroy_readpagecache(void);
140 extern int __init nfs_init_writepagecache(void);
141 extern void nfs_destroy_writepagecache(void);
143 extern int __init nfs_init_directcache(void);
144 extern void nfs_destroy_directcache(void);
147 extern int nfs_stat_to_errno(int);
148 extern struct rpc_procinfo nfs_procedures[];
149 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
152 extern struct rpc_procinfo nfs3_procedures[];
153 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
157 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
162 extern struct rpc_procinfo nfs4_procedures[];
166 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
169 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
172 extern struct workqueue_struct *nfsiod_workqueue;
173 extern struct inode *nfs_alloc_inode(struct super_block *sb);
174 extern void nfs_destroy_inode(struct inode *);
175 extern int nfs_write_inode(struct inode *,int);
176 extern void nfs_clear_inode(struct inode *);
178 extern void nfs4_clear_inode(struct inode *);
180 void nfs_zap_acl_cache(struct inode *inode);
181 extern int nfs_wait_bit_killable(void *word);
184 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
185 extern struct file_system_type nfs_xdev_fs_type;
187 extern struct file_system_type nfs4_xdev_fs_type;
188 extern struct file_system_type nfs4_referral_fs_type;
191 extern struct rpc_stat nfs_rpcstat;
193 extern int __init register_nfs_fs(void);
194 extern void __exit unregister_nfs_fs(void);
195 extern void nfs_sb_active(struct super_block *sb);
196 extern void nfs_sb_deactive(struct super_block *sb);
199 extern char *nfs_path(const char *base,
200 const struct dentry *droot,
201 const struct dentry *dentry,
202 char *buffer, ssize_t buflen);
205 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
207 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
209 extern int nfs4_path_walk(struct nfs_server *server,
210 struct nfs_fh *mntfh,
215 * Determine the device name as a string
217 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
218 const struct dentry *dentry,
219 char *buffer, ssize_t buflen)
221 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
222 dentry, buffer, buflen);
226 * Determine the actual block size (and log2 thereof)
229 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
231 /* make sure blocksize is a power of two */
232 if ((bsize & (bsize - 1)) || nrbitsp) {
233 unsigned char nrbits;
235 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
246 * Calculate the number of 512byte blocks used.
248 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
250 blkcnt_t used = (tsize + 511) >> 9;
251 return (used > ULONG_MAX) ? ULONG_MAX : used;
255 * Compute and set NFS server blocksize
258 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
260 if (bsize < NFS_MIN_FILE_IO_SIZE)
261 bsize = NFS_DEF_FILE_IO_SIZE;
262 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
263 bsize = NFS_MAX_FILE_IO_SIZE;
265 return nfs_block_bits(bsize, nrbitsp);
269 * Determine the maximum file size for a superblock
272 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
274 sb->s_maxbytes = (loff_t)maxfilesize;
275 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
276 sb->s_maxbytes = MAX_LFS_FILESIZE;
280 * Determine the number of bytes of data the page contains
283 unsigned int nfs_page_length(struct page *page)
285 loff_t i_size = i_size_read(page->mapping->host);
288 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
289 if (page->index < end_index)
290 return PAGE_CACHE_SIZE;
291 if (page->index == end_index)
292 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
298 * Determine the number of pages in an array of length 'len' and
299 * with a base offset of 'base'
302 unsigned int nfs_page_array_len(unsigned int base, size_t len)
304 return ((unsigned long)len + (unsigned long)base +
305 PAGE_SIZE - 1) >> PAGE_SHIFT;
308 #define IPV6_SCOPE_DELIMITER '%'
311 * Set the port number in an address. Be agnostic about the address
314 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
316 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
317 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
319 switch (sap->sa_family) {
321 ap->sin_port = htons(port);
324 ap6->sin6_port = htons(port);