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 #ifdef CONFIG_PROC_FS
118 extern int __init nfs_fs_proc_init(void);
119 extern void nfs_fs_proc_exit(void);
121 static inline int nfs_fs_proc_init(void)
125 static inline void nfs_fs_proc_exit(void)
130 /* nfs4namespace.c */
132 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
135 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
137 return ERR_PTR(-ENOENT);
142 extern struct svc_version nfs4_callback_version1;
145 extern int __init nfs_init_nfspagecache(void);
146 extern void nfs_destroy_nfspagecache(void);
147 extern int __init nfs_init_readpagecache(void);
148 extern void nfs_destroy_readpagecache(void);
149 extern int __init nfs_init_writepagecache(void);
150 extern void nfs_destroy_writepagecache(void);
152 extern int __init nfs_init_directcache(void);
153 extern void nfs_destroy_directcache(void);
156 extern int nfs_stat_to_errno(int);
157 extern struct rpc_procinfo nfs_procedures[];
158 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
161 extern struct rpc_procinfo nfs3_procedures[];
162 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
165 static inline void nfs4_restart_rpc(struct rpc_task *task,
166 const struct nfs_client *clp)
168 #ifdef CONFIG_NFS_V4_1
169 if (nfs4_has_session(clp) &&
170 test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state)) {
171 rpc_restart_call_prepare(task);
174 #endif /* CONFIG_NFS_V4_1 */
175 rpc_restart_call(task);
180 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
185 extern struct rpc_procinfo nfs4_procedures[];
189 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
192 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
195 extern struct workqueue_struct *nfsiod_workqueue;
196 extern struct inode *nfs_alloc_inode(struct super_block *sb);
197 extern void nfs_destroy_inode(struct inode *);
198 extern int nfs_write_inode(struct inode *,int);
199 extern void nfs_clear_inode(struct inode *);
201 extern void nfs4_clear_inode(struct inode *);
203 void nfs_zap_acl_cache(struct inode *inode);
204 extern int nfs_wait_bit_killable(void *word);
207 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
208 extern struct file_system_type nfs_xdev_fs_type;
210 extern struct file_system_type nfs4_xdev_fs_type;
211 extern struct file_system_type nfs4_referral_fs_type;
214 extern struct rpc_stat nfs_rpcstat;
216 extern int __init register_nfs_fs(void);
217 extern void __exit unregister_nfs_fs(void);
218 extern void nfs_sb_active(struct super_block *sb);
219 extern void nfs_sb_deactive(struct super_block *sb);
222 extern char *nfs_path(const char *base,
223 const struct dentry *droot,
224 const struct dentry *dentry,
225 char *buffer, ssize_t buflen);
228 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
230 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
232 extern int nfs4_path_walk(struct nfs_server *server,
233 struct nfs_fh *mntfh,
238 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
241 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
244 extern int _nfs4_call_sync(struct nfs_server *server,
245 struct rpc_message *msg,
246 struct nfs4_sequence_args *args,
247 struct nfs4_sequence_res *res,
249 extern int _nfs4_call_sync_session(struct nfs_server *server,
250 struct rpc_message *msg,
251 struct nfs4_sequence_args *args,
252 struct nfs4_sequence_res *res,
255 #ifdef CONFIG_NFS_V4_1
256 extern void nfs41_sequence_free_slot(const struct nfs_client *,
257 struct nfs4_sequence_res *res);
258 #endif /* CONFIG_NFS_V4_1 */
260 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
261 struct nfs4_sequence_res *res)
263 #ifdef CONFIG_NFS_V4_1
264 if (nfs4_has_session(clp))
265 nfs41_sequence_free_slot(clp, res);
266 #endif /* CONFIG_NFS_V4_1 */
270 * Determine the device name as a string
272 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
273 const struct dentry *dentry,
274 char *buffer, ssize_t buflen)
276 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
277 dentry, buffer, buflen);
281 * Determine the actual block size (and log2 thereof)
284 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
286 /* make sure blocksize is a power of two */
287 if ((bsize & (bsize - 1)) || nrbitsp) {
288 unsigned char nrbits;
290 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
301 * Calculate the number of 512byte blocks used.
303 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
305 blkcnt_t used = (tsize + 511) >> 9;
306 return (used > ULONG_MAX) ? ULONG_MAX : used;
310 * Compute and set NFS server blocksize
313 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
315 if (bsize < NFS_MIN_FILE_IO_SIZE)
316 bsize = NFS_DEF_FILE_IO_SIZE;
317 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
318 bsize = NFS_MAX_FILE_IO_SIZE;
320 return nfs_block_bits(bsize, nrbitsp);
324 * Determine the maximum file size for a superblock
327 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
329 sb->s_maxbytes = (loff_t)maxfilesize;
330 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
331 sb->s_maxbytes = MAX_LFS_FILESIZE;
335 * Determine the number of bytes of data the page contains
338 unsigned int nfs_page_length(struct page *page)
340 loff_t i_size = i_size_read(page->mapping->host);
343 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
344 if (page->index < end_index)
345 return PAGE_CACHE_SIZE;
346 if (page->index == end_index)
347 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
353 * Determine the number of pages in an array of length 'len' and
354 * with a base offset of 'base'
357 unsigned int nfs_page_array_len(unsigned int base, size_t len)
359 return ((unsigned long)len + (unsigned long)base +
360 PAGE_SIZE - 1) >> PAGE_SHIFT;
363 #define IPV6_SCOPE_DELIMITER '%'
366 * Set the port number in an address. Be agnostic about the address
369 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
371 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
372 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
374 switch (sap->sa_family) {
376 ap->sin_port = htons(port);
379 ap6->sin6_port = htons(port);