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 * In-kernel mount arguments
48 struct nfs_parsed_mount_data {
52 int acregmin, acregmax,
57 unsigned int auth_flavor_len;
58 rpc_authflavor_t auth_flavors[1];
60 unsigned int minorversion;
64 struct sockaddr_storage address;
69 unsigned short protocol;
73 struct sockaddr_storage address;
78 unsigned short protocol;
81 struct security_mnt_opts lsm_opts;
85 struct nfs_mount_request {
91 unsigned short protocol;
96 extern int nfs_mount(struct nfs_mount_request *info);
99 extern struct rpc_program nfs_program;
101 extern void nfs_put_client(struct nfs_client *);
102 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
103 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
104 extern struct nfs_server *nfs_create_server(
105 const struct nfs_parsed_mount_data *,
107 extern struct nfs_server *nfs4_create_server(
108 const struct nfs_parsed_mount_data *,
110 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
112 extern void nfs_free_server(struct nfs_server *server);
113 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
116 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
117 extern int nfs4_check_client_ready(struct nfs_client *clp);
118 #ifdef CONFIG_PROC_FS
119 extern int __init nfs_fs_proc_init(void);
120 extern void nfs_fs_proc_exit(void);
122 static inline int nfs_fs_proc_init(void)
126 static inline void nfs_fs_proc_exit(void)
131 /* nfs4namespace.c */
133 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
136 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
138 return ERR_PTR(-ENOENT);
143 extern struct svc_version nfs4_callback_version1;
146 extern int __init nfs_init_nfspagecache(void);
147 extern void nfs_destroy_nfspagecache(void);
148 extern int __init nfs_init_readpagecache(void);
149 extern void nfs_destroy_readpagecache(void);
150 extern int __init nfs_init_writepagecache(void);
151 extern void nfs_destroy_writepagecache(void);
153 extern int __init nfs_init_directcache(void);
154 extern void nfs_destroy_directcache(void);
157 extern int nfs_stat_to_errno(int);
158 extern struct rpc_procinfo nfs_procedures[];
159 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
162 extern struct rpc_procinfo nfs3_procedures[];
163 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
166 static inline void nfs4_restart_rpc(struct rpc_task *task,
167 const struct nfs_client *clp)
169 #ifdef CONFIG_NFS_V4_1
170 if (nfs4_has_session(clp) &&
171 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
172 rpc_restart_call_prepare(task);
175 #endif /* CONFIG_NFS_V4_1 */
176 rpc_restart_call(task);
181 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
186 extern struct rpc_procinfo nfs4_procedures[];
190 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
193 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
196 extern struct workqueue_struct *nfsiod_workqueue;
197 extern struct inode *nfs_alloc_inode(struct super_block *sb);
198 extern void nfs_destroy_inode(struct inode *);
199 extern int nfs_write_inode(struct inode *,int);
200 extern void nfs_clear_inode(struct inode *);
202 extern void nfs4_clear_inode(struct inode *);
204 void nfs_zap_acl_cache(struct inode *inode);
205 extern int nfs_wait_bit_killable(void *word);
208 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
209 extern struct file_system_type nfs_xdev_fs_type;
211 extern struct file_system_type nfs4_xdev_fs_type;
212 extern struct file_system_type nfs4_referral_fs_type;
215 extern struct rpc_stat nfs_rpcstat;
217 extern int __init register_nfs_fs(void);
218 extern void __exit unregister_nfs_fs(void);
219 extern void nfs_sb_active(struct super_block *sb);
220 extern void nfs_sb_deactive(struct super_block *sb);
223 extern char *nfs_path(const char *base,
224 const struct dentry *droot,
225 const struct dentry *dentry,
226 char *buffer, ssize_t buflen);
229 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
231 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
233 extern int nfs4_path_walk(struct nfs_server *server,
234 struct nfs_fh *mntfh,
239 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
242 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
245 extern int _nfs4_call_sync(struct nfs_server *server,
246 struct rpc_message *msg,
247 struct nfs4_sequence_args *args,
248 struct nfs4_sequence_res *res,
250 extern int _nfs4_call_sync_session(struct nfs_server *server,
251 struct rpc_message *msg,
252 struct nfs4_sequence_args *args,
253 struct nfs4_sequence_res *res,
256 #ifdef CONFIG_NFS_V4_1
257 extern void nfs41_sequence_free_slot(const struct nfs_client *,
258 struct nfs4_sequence_res *res);
259 #endif /* CONFIG_NFS_V4_1 */
261 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
262 struct nfs4_sequence_res *res)
264 #ifdef CONFIG_NFS_V4_1
265 if (nfs4_has_session(clp))
266 nfs41_sequence_free_slot(clp, res);
267 #endif /* CONFIG_NFS_V4_1 */
271 * Determine the device name as a string
273 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
274 const struct dentry *dentry,
275 char *buffer, ssize_t buflen)
277 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
278 dentry, buffer, buflen);
282 * Determine the actual block size (and log2 thereof)
285 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
287 /* make sure blocksize is a power of two */
288 if ((bsize & (bsize - 1)) || nrbitsp) {
289 unsigned char nrbits;
291 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
302 * Calculate the number of 512byte blocks used.
304 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
306 blkcnt_t used = (tsize + 511) >> 9;
307 return (used > ULONG_MAX) ? ULONG_MAX : used;
311 * Compute and set NFS server blocksize
314 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
316 if (bsize < NFS_MIN_FILE_IO_SIZE)
317 bsize = NFS_DEF_FILE_IO_SIZE;
318 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
319 bsize = NFS_MAX_FILE_IO_SIZE;
321 return nfs_block_bits(bsize, nrbitsp);
325 * Determine the maximum file size for a superblock
328 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
330 sb->s_maxbytes = (loff_t)maxfilesize;
331 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
332 sb->s_maxbytes = MAX_LFS_FILESIZE;
336 * Determine the number of bytes of data the page contains
339 unsigned int nfs_page_length(struct page *page)
341 loff_t i_size = i_size_read(page->mapping->host);
344 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
345 if (page->index < end_index)
346 return PAGE_CACHE_SIZE;
347 if (page->index == end_index)
348 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
354 * Determine the number of pages in an array of length 'len' and
355 * with a base offset of 'base'
358 unsigned int nfs_page_array_len(unsigned int base, size_t len)
360 return ((unsigned long)len + (unsigned long)base +
361 PAGE_SIZE - 1) >> PAGE_SHIFT;
364 #define IPV6_SCOPE_DELIMITER '%'
367 * Set the port number in an address. Be agnostic about the address
370 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
372 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
373 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
375 switch (sap->sa_family) {
377 ap->sin_port = htons(port);
380 ap6->sin6_port = htons(port);