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 * Value used if the user did not specify a port value.
54 #define NFS_UNSPEC_PORT (-1)
57 * In-kernel mount arguments
59 struct nfs_parsed_mount_data {
63 int acregmin, acregmax,
68 unsigned int auth_flavor_len;
69 rpc_authflavor_t auth_flavors[1];
72 unsigned int minorversion;
76 struct sockaddr_storage address;
81 unsigned short protocol;
85 struct sockaddr_storage address;
90 unsigned short protocol;
93 struct security_mnt_opts lsm_opts;
97 struct nfs_mount_request {
103 unsigned short protocol;
106 unsigned int *auth_flav_len;
107 rpc_authflavor_t *auth_flavs;
110 extern int nfs_mount(struct nfs_mount_request *info);
111 extern void nfs_umount(const struct nfs_mount_request *info);
114 extern struct rpc_program nfs_program;
116 extern void nfs_put_client(struct nfs_client *);
117 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
118 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
119 extern struct nfs_server *nfs_create_server(
120 const struct nfs_parsed_mount_data *,
122 extern struct nfs_server *nfs4_create_server(
123 const struct nfs_parsed_mount_data *,
125 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
127 extern void nfs_free_server(struct nfs_server *server);
128 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
131 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
132 extern int nfs4_check_client_ready(struct nfs_client *clp);
133 #ifdef CONFIG_PROC_FS
134 extern int __init nfs_fs_proc_init(void);
135 extern void nfs_fs_proc_exit(void);
137 static inline int nfs_fs_proc_init(void)
141 static inline void nfs_fs_proc_exit(void)
146 /* nfs4namespace.c */
148 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
151 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
153 return ERR_PTR(-ENOENT);
158 extern struct svc_version nfs4_callback_version1;
161 extern int __init nfs_init_nfspagecache(void);
162 extern void nfs_destroy_nfspagecache(void);
163 extern int __init nfs_init_readpagecache(void);
164 extern void nfs_destroy_readpagecache(void);
165 extern int __init nfs_init_writepagecache(void);
166 extern void nfs_destroy_writepagecache(void);
168 extern int __init nfs_init_directcache(void);
169 extern void nfs_destroy_directcache(void);
172 extern int nfs_stat_to_errno(int);
173 extern struct rpc_procinfo nfs_procedures[];
174 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
177 extern struct rpc_procinfo nfs3_procedures[];
178 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
181 static inline void nfs4_restart_rpc(struct rpc_task *task,
182 const struct nfs_client *clp)
184 #ifdef CONFIG_NFS_V4_1
185 if (nfs4_has_session(clp) &&
186 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
187 rpc_restart_call_prepare(task);
190 #endif /* CONFIG_NFS_V4_1 */
191 rpc_restart_call(task);
196 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
201 extern struct rpc_procinfo nfs4_procedures[];
205 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
208 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
211 extern struct workqueue_struct *nfsiod_workqueue;
212 extern struct inode *nfs_alloc_inode(struct super_block *sb);
213 extern void nfs_destroy_inode(struct inode *);
214 extern int nfs_write_inode(struct inode *,int);
215 extern void nfs_clear_inode(struct inode *);
217 extern void nfs4_clear_inode(struct inode *);
219 void nfs_zap_acl_cache(struct inode *inode);
220 extern int nfs_wait_bit_killable(void *word);
223 extern struct file_system_type nfs_xdev_fs_type;
225 extern struct file_system_type nfs4_xdev_fs_type;
226 extern struct file_system_type nfs4_referral_fs_type;
229 extern struct rpc_stat nfs_rpcstat;
231 extern int __init register_nfs_fs(void);
232 extern void __exit unregister_nfs_fs(void);
233 extern void nfs_sb_active(struct super_block *sb);
234 extern void nfs_sb_deactive(struct super_block *sb);
237 extern char *nfs_path(const char *base,
238 const struct dentry *droot,
239 const struct dentry *dentry,
240 char *buffer, ssize_t buflen);
243 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
245 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
247 extern int nfs4_path_walk(struct nfs_server *server,
248 struct nfs_fh *mntfh,
253 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
256 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
257 #ifdef CONFIG_MIGRATION
258 extern int nfs_migrate_page(struct address_space *,
259 struct page *, struct page *);
261 #define nfs_migrate_page NULL
265 extern int _nfs4_call_sync(struct nfs_server *server,
266 struct rpc_message *msg,
267 struct nfs4_sequence_args *args,
268 struct nfs4_sequence_res *res,
270 extern int _nfs4_call_sync_session(struct nfs_server *server,
271 struct rpc_message *msg,
272 struct nfs4_sequence_args *args,
273 struct nfs4_sequence_res *res,
276 #ifdef CONFIG_NFS_V4_1
277 extern void nfs41_sequence_free_slot(const struct nfs_client *,
278 struct nfs4_sequence_res *res);
279 #endif /* CONFIG_NFS_V4_1 */
281 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
282 struct nfs4_sequence_res *res)
284 #ifdef CONFIG_NFS_V4_1
285 if (nfs4_has_session(clp))
286 nfs41_sequence_free_slot(clp, res);
287 #endif /* CONFIG_NFS_V4_1 */
291 * Determine the device name as a string
293 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
294 const struct dentry *dentry,
295 char *buffer, ssize_t buflen)
297 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
298 dentry, buffer, buflen);
302 * Determine the actual block size (and log2 thereof)
305 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
307 /* make sure blocksize is a power of two */
308 if ((bsize & (bsize - 1)) || nrbitsp) {
309 unsigned char nrbits;
311 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
322 * Calculate the number of 512byte blocks used.
324 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
326 blkcnt_t used = (tsize + 511) >> 9;
327 return (used > ULONG_MAX) ? ULONG_MAX : used;
331 * Compute and set NFS server blocksize
334 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
336 if (bsize < NFS_MIN_FILE_IO_SIZE)
337 bsize = NFS_DEF_FILE_IO_SIZE;
338 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
339 bsize = NFS_MAX_FILE_IO_SIZE;
341 return nfs_block_bits(bsize, nrbitsp);
345 * Determine the maximum file size for a superblock
348 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
350 sb->s_maxbytes = (loff_t)maxfilesize;
351 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
352 sb->s_maxbytes = MAX_LFS_FILESIZE;
356 * Determine the number of bytes of data the page contains
359 unsigned int nfs_page_length(struct page *page)
361 loff_t i_size = i_size_read(page->mapping->host);
364 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
365 if (page->index < end_index)
366 return PAGE_CACHE_SIZE;
367 if (page->index == end_index)
368 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
374 * Determine the number of pages in an array of length 'len' and
375 * with a base offset of 'base'
378 unsigned int nfs_page_array_len(unsigned int base, size_t len)
380 return ((unsigned long)len + (unsigned long)base +
381 PAGE_SIZE - 1) >> PAGE_SHIFT;