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 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
35 #ifdef CONFIG_NFS_V4_1
36 if (nfs4_has_session(clp))
37 return (clp->cl_session->flags & SESSION4_PERSIST);
38 #endif /* CONFIG_NFS_V4_1 */
42 struct nfs_clone_mount {
43 const struct super_block *sb;
44 const struct dentry *dentry;
46 struct nfs_fattr *fattr;
49 struct sockaddr *addr;
51 rpc_authflavor_t authflavor;
55 * Note: RFC 1813 doesn't limit the number of auth flavors that
56 * a server can return, so make something up.
58 #define NFS_MAX_SECFLAVORS (12)
61 * Value used if the user did not specify a port value.
63 #define NFS_UNSPEC_PORT (-1)
66 * Maximum number of pages that readdir can use for creating
67 * a vmapped array of pages.
69 #define NFS_MAX_READDIR_PAGES 8
72 * In-kernel mount arguments
74 struct nfs_parsed_mount_data {
78 int acregmin, acregmax,
83 unsigned int auth_flavor_len;
84 rpc_authflavor_t auth_flavors[1];
87 unsigned int minorversion;
91 struct sockaddr_storage address;
96 unsigned short protocol;
100 struct sockaddr_storage address;
105 unsigned short protocol;
108 struct security_mnt_opts lsm_opts;
112 struct nfs_mount_request {
113 struct sockaddr *sap;
118 unsigned short protocol;
121 unsigned int *auth_flav_len;
122 rpc_authflavor_t *auth_flavs;
125 extern int nfs_mount(struct nfs_mount_request *info);
126 extern void nfs_umount(const struct nfs_mount_request *info);
129 extern struct rpc_program nfs_program;
131 extern void nfs_cleanup_cb_ident_idr(void);
132 extern void nfs_put_client(struct nfs_client *);
133 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
134 extern struct nfs_client *nfs4_find_client_ident(int);
135 extern struct nfs_client *
136 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
137 extern struct nfs_server *nfs_create_server(
138 const struct nfs_parsed_mount_data *,
140 extern struct nfs_server *nfs4_create_server(
141 const struct nfs_parsed_mount_data *,
143 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
145 extern void nfs_free_server(struct nfs_server *server);
146 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
149 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
150 extern int nfs4_check_client_ready(struct nfs_client *clp);
151 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
152 const struct sockaddr *ds_addr,
153 int ds_addrlen, int ds_proto);
154 #ifdef CONFIG_PROC_FS
155 extern int __init nfs_fs_proc_init(void);
156 extern void nfs_fs_proc_exit(void);
158 static inline int nfs_fs_proc_init(void)
162 static inline void nfs_fs_proc_exit(void)
167 /* nfs4namespace.c */
169 extern struct vfsmount *nfs_do_refmount(struct dentry *dentry);
172 struct vfsmount *nfs_do_refmount(struct dentry *dentry)
174 return ERR_PTR(-ENOENT);
179 extern struct svc_version nfs4_callback_version1;
180 extern struct svc_version nfs4_callback_version4;
183 extern int __init nfs_init_nfspagecache(void);
184 extern void nfs_destroy_nfspagecache(void);
185 extern int __init nfs_init_readpagecache(void);
186 extern void nfs_destroy_readpagecache(void);
187 extern int __init nfs_init_writepagecache(void);
188 extern void nfs_destroy_writepagecache(void);
190 extern int __init nfs_init_directcache(void);
191 extern void nfs_destroy_directcache(void);
194 extern int nfs_stat_to_errno(enum nfs_stat);
195 extern struct rpc_procinfo nfs_procedures[];
196 extern int nfs2_decode_dirent(struct xdr_stream *,
197 struct nfs_entry *, int);
200 extern struct rpc_procinfo nfs3_procedures[];
201 extern int nfs3_decode_dirent(struct xdr_stream *,
202 struct nfs_entry *, int);
206 extern int nfs4_decode_dirent(struct xdr_stream *,
207 struct nfs_entry *, int);
209 #ifdef CONFIG_NFS_V4_1
210 extern const u32 nfs41_maxread_overhead;
211 extern const u32 nfs41_maxwrite_overhead;
216 extern struct rpc_procinfo nfs4_procedures[];
219 extern int nfs4_init_ds_session(struct nfs_client *clp);
222 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
223 extern int nfs_init_client(struct nfs_client *clp,
224 const struct rpc_timeout *timeparms,
225 const char *ip_addr, rpc_authflavor_t authflavour,
229 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
230 int nr_to_scan, gfp_t gfp_mask);
233 extern struct workqueue_struct *nfsiod_workqueue;
234 extern struct inode *nfs_alloc_inode(struct super_block *sb);
235 extern void nfs_destroy_inode(struct inode *);
236 extern int nfs_write_inode(struct inode *, struct writeback_control *);
237 extern void nfs_evict_inode(struct inode *);
239 extern void nfs4_evict_inode(struct inode *);
241 void nfs_zap_acl_cache(struct inode *inode);
242 extern int nfs_wait_bit_killable(void *word);
245 extern struct file_system_type nfs_xdev_fs_type;
247 extern struct file_system_type nfs4_xdev_fs_type;
248 extern struct file_system_type nfs4_referral_fs_type;
251 extern struct rpc_stat nfs_rpcstat;
253 extern int __init register_nfs_fs(void);
254 extern void __exit unregister_nfs_fs(void);
255 extern void nfs_sb_active(struct super_block *sb);
256 extern void nfs_sb_deactive(struct super_block *sb);
259 extern char *nfs_path(char **p, struct dentry *dentry,
260 char *buffer, ssize_t buflen);
261 extern struct vfsmount *nfs_d_automount(struct path *path);
264 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
267 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
270 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
274 extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
275 const struct rpc_call_ops *call_ops);
276 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
279 extern int nfs_initiate_write(struct nfs_write_data *data,
280 struct rpc_clnt *clnt,
281 const struct rpc_call_ops *call_ops,
283 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
284 #ifdef CONFIG_MIGRATION
285 extern int nfs_migrate_page(struct address_space *,
286 struct page *, struct page *);
288 #define nfs_migrate_page NULL
292 extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data);
293 extern int nfs4_init_client(struct nfs_client *clp,
294 const struct rpc_timeout *timeparms,
296 rpc_authflavor_t authflavour,
298 extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data);
299 extern int _nfs4_call_sync(struct rpc_clnt *clnt,
300 struct nfs_server *server,
301 struct rpc_message *msg,
302 struct nfs4_sequence_args *args,
303 struct nfs4_sequence_res *res,
305 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
306 struct nfs_server *server,
307 struct rpc_message *msg,
308 struct nfs4_sequence_args *args,
309 struct nfs4_sequence_res *res,
313 * Determine the device name as a string
315 static inline char *nfs_devname(struct dentry *dentry,
316 char *buffer, ssize_t buflen)
319 return nfs_path(&dummy, dentry, buffer, buflen);
323 * Determine the actual block size (and log2 thereof)
326 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
328 /* make sure blocksize is a power of two */
329 if ((bsize & (bsize - 1)) || nrbitsp) {
330 unsigned char nrbits;
332 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
343 * Calculate the number of 512byte blocks used.
345 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
347 blkcnt_t used = (tsize + 511) >> 9;
348 return (used > ULONG_MAX) ? ULONG_MAX : used;
352 * Compute and set NFS server blocksize
355 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
357 if (bsize < NFS_MIN_FILE_IO_SIZE)
358 bsize = NFS_DEF_FILE_IO_SIZE;
359 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
360 bsize = NFS_MAX_FILE_IO_SIZE;
362 return nfs_block_bits(bsize, nrbitsp);
366 * Determine the maximum file size for a superblock
369 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
371 sb->s_maxbytes = (loff_t)maxfilesize;
372 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
373 sb->s_maxbytes = MAX_LFS_FILESIZE;
377 * Determine the number of bytes of data the page contains
380 unsigned int nfs_page_length(struct page *page)
382 loff_t i_size = i_size_read(page->mapping->host);
385 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
386 if (page->index < end_index)
387 return PAGE_CACHE_SIZE;
388 if (page->index == end_index)
389 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
395 * Convert a umode to a dirent->d_type
398 unsigned char nfs_umode_to_dtype(umode_t mode)
400 return (mode >> 12) & 15;
404 * Determine the number of pages in an array of length 'len' and
405 * with a base offset of 'base'
408 unsigned int nfs_page_array_len(unsigned int base, size_t len)
410 return ((unsigned long)len + (unsigned long)base +
411 PAGE_SIZE - 1) >> PAGE_SHIFT;
415 * Helper for restarting RPC calls in the possible presence of NFSv4.1
418 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
420 if (nfs4_has_session(clp))
421 return rpc_restart_call_prepare(task);
422 return rpc_restart_call(task);