2 * NFS internal definitions
6 #include <linux/mount.h>
7 #include <linux/security.h>
9 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
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.
19 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
22 * Determine if sessions are in use.
24 static inline int nfs4_has_session(const struct nfs_client *clp)
26 #ifdef CONFIG_NFS_V4_1
29 #endif /* CONFIG_NFS_V4_1 */
33 struct nfs_clone_mount {
34 const struct super_block *sb;
35 const struct dentry *dentry;
37 struct nfs_fattr *fattr;
40 struct sockaddr *addr;
42 rpc_authflavor_t authflavor;
46 * Note: RFC 1813 doesn't limit the number of auth flavors that
47 * a server can return, so make something up.
49 #define NFS_MAX_SECFLAVORS (12)
52 * In-kernel mount arguments
54 struct nfs_parsed_mount_data {
58 int acregmin, acregmax,
63 unsigned int auth_flavor_len;
64 rpc_authflavor_t auth_flavors[1];
66 unsigned int minorversion;
70 struct sockaddr_storage address;
75 unsigned short protocol;
79 struct sockaddr_storage address;
84 unsigned short protocol;
87 struct security_mnt_opts lsm_opts;
91 struct nfs_mount_request {
97 unsigned short protocol;
100 unsigned int *auth_flav_len;
101 rpc_authflavor_t *auth_flavs;
104 extern int nfs_mount(struct nfs_mount_request *info);
107 extern struct rpc_program nfs_program;
109 extern void nfs_put_client(struct nfs_client *);
110 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
111 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
112 extern struct nfs_server *nfs_create_server(
113 const struct nfs_parsed_mount_data *,
115 extern struct nfs_server *nfs4_create_server(
116 const struct nfs_parsed_mount_data *,
118 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
120 extern void nfs_free_server(struct nfs_server *server);
121 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
124 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
125 extern int nfs4_check_client_ready(struct nfs_client *clp);
126 #ifdef CONFIG_PROC_FS
127 extern int __init nfs_fs_proc_init(void);
128 extern void nfs_fs_proc_exit(void);
130 static inline int nfs_fs_proc_init(void)
134 static inline void nfs_fs_proc_exit(void)
139 /* nfs4namespace.c */
141 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
144 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
146 return ERR_PTR(-ENOENT);
151 extern struct svc_version nfs4_callback_version1;
154 extern int __init nfs_init_nfspagecache(void);
155 extern void nfs_destroy_nfspagecache(void);
156 extern int __init nfs_init_readpagecache(void);
157 extern void nfs_destroy_readpagecache(void);
158 extern int __init nfs_init_writepagecache(void);
159 extern void nfs_destroy_writepagecache(void);
161 extern int __init nfs_init_directcache(void);
162 extern void nfs_destroy_directcache(void);
165 extern int nfs_stat_to_errno(int);
166 extern struct rpc_procinfo nfs_procedures[];
167 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
170 extern struct rpc_procinfo nfs3_procedures[];
171 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
174 static inline void nfs4_restart_rpc(struct rpc_task *task,
175 const struct nfs_client *clp)
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);
183 #endif /* CONFIG_NFS_V4_1 */
184 rpc_restart_call(task);
189 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
194 extern struct rpc_procinfo nfs4_procedures[];
198 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
201 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
204 extern struct workqueue_struct *nfsiod_workqueue;
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 *);
210 extern void nfs4_clear_inode(struct inode *);
212 void nfs_zap_acl_cache(struct inode *inode);
213 extern int nfs_wait_bit_killable(void *word);
216 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
217 extern struct file_system_type nfs_xdev_fs_type;
219 extern struct file_system_type nfs4_xdev_fs_type;
220 extern struct file_system_type nfs4_referral_fs_type;
223 extern struct rpc_stat nfs_rpcstat;
225 extern int __init register_nfs_fs(void);
226 extern void __exit unregister_nfs_fs(void);
227 extern void nfs_sb_active(struct super_block *sb);
228 extern void nfs_sb_deactive(struct super_block *sb);
231 extern char *nfs_path(const char *base,
232 const struct dentry *droot,
233 const struct dentry *dentry,
234 char *buffer, ssize_t buflen);
237 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
239 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
241 extern int nfs4_path_walk(struct nfs_server *server,
242 struct nfs_fh *mntfh,
247 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
250 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
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,
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,
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 */
269 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
270 struct nfs4_sequence_res *res)
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 */
279 * Determine the device name as a string
281 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
282 const struct dentry *dentry,
283 char *buffer, ssize_t buflen)
285 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
286 dentry, buffer, buflen);
290 * Determine the actual block size (and log2 thereof)
293 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
295 /* make sure blocksize is a power of two */
296 if ((bsize & (bsize - 1)) || nrbitsp) {
297 unsigned char nrbits;
299 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
310 * Calculate the number of 512byte blocks used.
312 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
314 blkcnt_t used = (tsize + 511) >> 9;
315 return (used > ULONG_MAX) ? ULONG_MAX : used;
319 * Compute and set NFS server blocksize
322 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
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;
329 return nfs_block_bits(bsize, nrbitsp);
333 * Determine the maximum file size for a superblock
336 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
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;
344 * Determine the number of bytes of data the page contains
347 unsigned int nfs_page_length(struct page *page)
349 loff_t i_size = i_size_read(page->mapping->host);
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;
362 * Determine the number of pages in an array of length 'len' and
363 * with a base offset of 'base'
366 unsigned int nfs_page_array_len(unsigned int base, size_t len)
368 return ((unsigned long)len + (unsigned long)base +
369 PAGE_SIZE - 1) >> PAGE_SHIFT;
372 #define IPV6_SCOPE_DELIMITER '%'
375 * Set the port number in an address. Be agnostic about the address
378 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
380 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
381 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
383 switch (sap->sa_family) {
385 ap->sin_port = htons(port);
388 ap6->sin6_port = htons(port);