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);
105 extern void nfs_umount(const struct nfs_mount_request *info);
108 extern struct rpc_program nfs_program;
110 extern void nfs_put_client(struct nfs_client *);
111 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
112 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
113 extern struct nfs_server *nfs_create_server(
114 const struct nfs_parsed_mount_data *,
116 extern struct nfs_server *nfs4_create_server(
117 const struct nfs_parsed_mount_data *,
119 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
121 extern void nfs_free_server(struct nfs_server *server);
122 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
125 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
126 extern int nfs4_check_client_ready(struct nfs_client *clp);
127 #ifdef CONFIG_PROC_FS
128 extern int __init nfs_fs_proc_init(void);
129 extern void nfs_fs_proc_exit(void);
131 static inline int nfs_fs_proc_init(void)
135 static inline void nfs_fs_proc_exit(void)
140 /* nfs4namespace.c */
142 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
145 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
147 return ERR_PTR(-ENOENT);
152 extern struct svc_version nfs4_callback_version1;
155 extern int __init nfs_init_nfspagecache(void);
156 extern void nfs_destroy_nfspagecache(void);
157 extern int __init nfs_init_readpagecache(void);
158 extern void nfs_destroy_readpagecache(void);
159 extern int __init nfs_init_writepagecache(void);
160 extern void nfs_destroy_writepagecache(void);
162 extern int __init nfs_init_directcache(void);
163 extern void nfs_destroy_directcache(void);
166 extern int nfs_stat_to_errno(int);
167 extern struct rpc_procinfo nfs_procedures[];
168 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
171 extern struct rpc_procinfo nfs3_procedures[];
172 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
175 static inline void nfs4_restart_rpc(struct rpc_task *task,
176 const struct nfs_client *clp)
178 #ifdef CONFIG_NFS_V4_1
179 if (nfs4_has_session(clp) &&
180 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
181 rpc_restart_call_prepare(task);
184 #endif /* CONFIG_NFS_V4_1 */
185 rpc_restart_call(task);
190 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
195 extern struct rpc_procinfo nfs4_procedures[];
199 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
202 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
205 extern struct workqueue_struct *nfsiod_workqueue;
206 extern struct inode *nfs_alloc_inode(struct super_block *sb);
207 extern void nfs_destroy_inode(struct inode *);
208 extern int nfs_write_inode(struct inode *,int);
209 extern void nfs_clear_inode(struct inode *);
211 extern void nfs4_clear_inode(struct inode *);
213 void nfs_zap_acl_cache(struct inode *inode);
214 extern int nfs_wait_bit_killable(void *word);
217 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
218 extern struct file_system_type nfs_xdev_fs_type;
220 extern struct file_system_type nfs4_xdev_fs_type;
221 extern struct file_system_type nfs4_referral_fs_type;
224 extern struct rpc_stat nfs_rpcstat;
226 extern int __init register_nfs_fs(void);
227 extern void __exit unregister_nfs_fs(void);
228 extern void nfs_sb_active(struct super_block *sb);
229 extern void nfs_sb_deactive(struct super_block *sb);
232 extern char *nfs_path(const char *base,
233 const struct dentry *droot,
234 const struct dentry *dentry,
235 char *buffer, ssize_t buflen);
238 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
240 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
242 extern int nfs4_path_walk(struct nfs_server *server,
243 struct nfs_fh *mntfh,
248 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
251 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
254 extern int _nfs4_call_sync(struct nfs_server *server,
255 struct rpc_message *msg,
256 struct nfs4_sequence_args *args,
257 struct nfs4_sequence_res *res,
259 extern int _nfs4_call_sync_session(struct nfs_server *server,
260 struct rpc_message *msg,
261 struct nfs4_sequence_args *args,
262 struct nfs4_sequence_res *res,
265 #ifdef CONFIG_NFS_V4_1
266 extern void nfs41_sequence_free_slot(const struct nfs_client *,
267 struct nfs4_sequence_res *res);
268 #endif /* CONFIG_NFS_V4_1 */
270 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
271 struct nfs4_sequence_res *res)
273 #ifdef CONFIG_NFS_V4_1
274 if (nfs4_has_session(clp))
275 nfs41_sequence_free_slot(clp, res);
276 #endif /* CONFIG_NFS_V4_1 */
280 * Determine the device name as a string
282 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
283 const struct dentry *dentry,
284 char *buffer, ssize_t buflen)
286 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
287 dentry, buffer, buflen);
291 * Determine the actual block size (and log2 thereof)
294 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
296 /* make sure blocksize is a power of two */
297 if ((bsize & (bsize - 1)) || nrbitsp) {
298 unsigned char nrbits;
300 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
311 * Calculate the number of 512byte blocks used.
313 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
315 blkcnt_t used = (tsize + 511) >> 9;
316 return (used > ULONG_MAX) ? ULONG_MAX : used;
320 * Compute and set NFS server blocksize
323 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
325 if (bsize < NFS_MIN_FILE_IO_SIZE)
326 bsize = NFS_DEF_FILE_IO_SIZE;
327 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
328 bsize = NFS_MAX_FILE_IO_SIZE;
330 return nfs_block_bits(bsize, nrbitsp);
334 * Determine the maximum file size for a superblock
337 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
339 sb->s_maxbytes = (loff_t)maxfilesize;
340 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
341 sb->s_maxbytes = MAX_LFS_FILESIZE;
345 * Determine the number of bytes of data the page contains
348 unsigned int nfs_page_length(struct page *page)
350 loff_t i_size = i_size_read(page->mapping->host);
353 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
354 if (page->index < end_index)
355 return PAGE_CACHE_SIZE;
356 if (page->index == end_index)
357 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
363 * Determine the number of pages in an array of length 'len' and
364 * with a base offset of 'base'
367 unsigned int nfs_page_array_len(unsigned int base, size_t len)
369 return ((unsigned long)len + (unsigned long)base +
370 PAGE_SIZE - 1) >> PAGE_SHIFT;
373 #define IPV6_SCOPE_DELIMITER '%'
376 * Set the port number in an address. Be agnostic about the address
379 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
381 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
382 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
384 switch (sap->sa_family) {
386 ap->sin_port = htons(port);
389 ap6->sin6_port = htons(port);