2 * NFS internal definitions
5 #include <linux/mount.h>
6 #include <linux/security.h>
8 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
12 /* Maximum number of readahead requests
13 * FIXME: this should really be a sysctl so that users may tune it to suit
14 * their needs. People that do NFS over a slow network, might for
15 * instance want to reduce it to something closer to 1 for improved
16 * interactive response.
18 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
20 struct nfs_clone_mount {
21 const struct super_block *sb;
22 const struct dentry *dentry;
24 struct nfs_fattr *fattr;
27 struct sockaddr *addr;
29 rpc_authflavor_t authflavor;
33 * In-kernel mount arguments
35 struct nfs_parsed_mount_data {
39 int acregmin, acregmax,
44 unsigned int auth_flavor_len;
45 rpc_authflavor_t auth_flavors[1];
47 unsigned int minorversion;
51 struct sockaddr_storage address;
56 unsigned short protocol;
60 struct sockaddr_storage address;
65 unsigned short protocol;
68 struct security_mnt_opts lsm_opts;
72 struct nfs_mount_request {
78 unsigned short protocol;
83 extern int nfs_mount(struct nfs_mount_request *info);
86 extern struct rpc_program nfs_program;
88 extern void nfs_put_client(struct nfs_client *);
89 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
90 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
91 extern struct nfs_server *nfs_create_server(
92 const struct nfs_parsed_mount_data *,
94 extern struct nfs_server *nfs4_create_server(
95 const struct nfs_parsed_mount_data *,
97 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
99 extern void nfs_free_server(struct nfs_server *server);
100 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
103 #ifdef CONFIG_PROC_FS
104 extern int __init nfs_fs_proc_init(void);
105 extern void nfs_fs_proc_exit(void);
107 static inline int nfs_fs_proc_init(void)
111 static inline void nfs_fs_proc_exit(void)
116 /* nfs4namespace.c */
118 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
121 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
123 return ERR_PTR(-ENOENT);
128 extern struct svc_version nfs4_callback_version1;
131 extern int __init nfs_init_nfspagecache(void);
132 extern void nfs_destroy_nfspagecache(void);
133 extern int __init nfs_init_readpagecache(void);
134 extern void nfs_destroy_readpagecache(void);
135 extern int __init nfs_init_writepagecache(void);
136 extern void nfs_destroy_writepagecache(void);
138 extern int __init nfs_init_directcache(void);
139 extern void nfs_destroy_directcache(void);
142 extern int nfs_stat_to_errno(int);
143 extern struct rpc_procinfo nfs_procedures[];
144 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
147 extern struct rpc_procinfo nfs3_procedures[];
148 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
152 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
157 extern struct rpc_procinfo nfs4_procedures[];
161 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
164 extern int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask);
167 extern struct workqueue_struct *nfsiod_workqueue;
168 extern struct inode *nfs_alloc_inode(struct super_block *sb);
169 extern void nfs_destroy_inode(struct inode *);
170 extern int nfs_write_inode(struct inode *,int);
171 extern void nfs_clear_inode(struct inode *);
173 extern void nfs4_clear_inode(struct inode *);
175 void nfs_zap_acl_cache(struct inode *inode);
176 extern int nfs_wait_bit_killable(void *word);
179 void nfs_parse_ip_address(char *, size_t, struct sockaddr *, size_t *);
180 extern struct file_system_type nfs_xdev_fs_type;
182 extern struct file_system_type nfs4_xdev_fs_type;
183 extern struct file_system_type nfs4_referral_fs_type;
186 extern struct rpc_stat nfs_rpcstat;
188 extern int __init register_nfs_fs(void);
189 extern void __exit unregister_nfs_fs(void);
190 extern void nfs_sb_active(struct super_block *sb);
191 extern void nfs_sb_deactive(struct super_block *sb);
194 extern char *nfs_path(const char *base,
195 const struct dentry *droot,
196 const struct dentry *dentry,
197 char *buffer, ssize_t buflen);
200 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
202 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
204 extern int nfs4_path_walk(struct nfs_server *server,
205 struct nfs_fh *mntfh,
210 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
213 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
216 extern int _nfs4_call_sync(struct nfs_server *server,
217 struct rpc_message *msg,
218 struct nfs4_sequence_args *args,
219 struct nfs4_sequence_res *res,
221 extern int _nfs4_call_sync_session(struct nfs_server *server,
222 struct rpc_message *msg,
223 struct nfs4_sequence_args *args,
224 struct nfs4_sequence_res *res,
228 * Determine if sessions are in use.
230 static inline int nfs4_has_session(const struct nfs_client *clp)
232 #ifdef CONFIG_NFS_V4_1
235 #endif /* CONFIG_NFS_V4_1 */
239 #ifdef CONFIG_NFS_V4_1
240 extern void nfs41_sequence_free_slot(const struct nfs_client *,
241 struct nfs4_sequence_res *res);
242 #endif /* CONFIG_NFS_V4_1 */
244 static inline void nfs4_sequence_free_slot(const struct nfs_client *clp,
245 struct nfs4_sequence_res *res)
247 #ifdef CONFIG_NFS_V4_1
248 if (nfs4_has_session(clp))
249 nfs41_sequence_free_slot(clp, res);
250 #endif /* CONFIG_NFS_V4_1 */
254 * Determine the device name as a string
256 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
257 const struct dentry *dentry,
258 char *buffer, ssize_t buflen)
260 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
261 dentry, buffer, buflen);
265 * Determine the actual block size (and log2 thereof)
268 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
270 /* make sure blocksize is a power of two */
271 if ((bsize & (bsize - 1)) || nrbitsp) {
272 unsigned char nrbits;
274 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
285 * Calculate the number of 512byte blocks used.
287 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
289 blkcnt_t used = (tsize + 511) >> 9;
290 return (used > ULONG_MAX) ? ULONG_MAX : used;
294 * Compute and set NFS server blocksize
297 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
299 if (bsize < NFS_MIN_FILE_IO_SIZE)
300 bsize = NFS_DEF_FILE_IO_SIZE;
301 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
302 bsize = NFS_MAX_FILE_IO_SIZE;
304 return nfs_block_bits(bsize, nrbitsp);
308 * Determine the maximum file size for a superblock
311 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
313 sb->s_maxbytes = (loff_t)maxfilesize;
314 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
315 sb->s_maxbytes = MAX_LFS_FILESIZE;
319 * Determine the number of bytes of data the page contains
322 unsigned int nfs_page_length(struct page *page)
324 loff_t i_size = i_size_read(page->mapping->host);
327 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
328 if (page->index < end_index)
329 return PAGE_CACHE_SIZE;
330 if (page->index == end_index)
331 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
337 * Determine the number of pages in an array of length 'len' and
338 * with a base offset of 'base'
341 unsigned int nfs_page_array_len(unsigned int base, size_t len)
343 return ((unsigned long)len + (unsigned long)base +
344 PAGE_SIZE - 1) >> PAGE_SHIFT;
347 #define IPV6_SCOPE_DELIMITER '%'
350 * Set the port number in an address. Be agnostic about the address
353 static inline void nfs_set_port(struct sockaddr *sap, unsigned short port)
355 struct sockaddr_in *ap = (struct sockaddr_in *)sap;
356 struct sockaddr_in6 *ap6 = (struct sockaddr_in6 *)sap;
358 switch (sap->sa_family) {
360 ap->sin_port = htons(port);
363 ap6->sin6_port = htons(port);