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 * In-kernel mount arguments
68 struct nfs_parsed_mount_data {
72 int acregmin, acregmax,
77 unsigned int auth_flavor_len;
78 rpc_authflavor_t auth_flavors[1];
81 unsigned int minorversion;
85 struct sockaddr_storage address;
90 unsigned short protocol;
94 struct sockaddr_storage address;
99 unsigned short protocol;
102 struct security_mnt_opts lsm_opts;
106 struct nfs_mount_request {
107 struct sockaddr *sap;
112 unsigned short protocol;
115 unsigned int *auth_flav_len;
116 rpc_authflavor_t *auth_flavs;
119 extern int nfs_mount(struct nfs_mount_request *info);
120 extern void nfs_umount(const struct nfs_mount_request *info);
123 extern struct rpc_program nfs_program;
125 extern void nfs_put_client(struct nfs_client *);
126 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
127 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
128 extern struct nfs_server *nfs_create_server(
129 const struct nfs_parsed_mount_data *,
131 extern struct nfs_server *nfs4_create_server(
132 const struct nfs_parsed_mount_data *,
134 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
136 extern void nfs_free_server(struct nfs_server *server);
137 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
140 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
141 extern int nfs4_check_client_ready(struct nfs_client *clp);
142 #ifdef CONFIG_PROC_FS
143 extern int __init nfs_fs_proc_init(void);
144 extern void nfs_fs_proc_exit(void);
146 static inline int nfs_fs_proc_init(void)
150 static inline void nfs_fs_proc_exit(void)
155 /* nfs4namespace.c */
157 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
160 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
162 return ERR_PTR(-ENOENT);
167 extern struct svc_version nfs4_callback_version1;
168 extern struct svc_version nfs4_callback_version4;
171 extern int __init nfs_init_nfspagecache(void);
172 extern void nfs_destroy_nfspagecache(void);
173 extern int __init nfs_init_readpagecache(void);
174 extern void nfs_destroy_readpagecache(void);
175 extern int __init nfs_init_writepagecache(void);
176 extern void nfs_destroy_writepagecache(void);
178 extern int __init nfs_init_directcache(void);
179 extern void nfs_destroy_directcache(void);
182 extern int nfs_stat_to_errno(int);
183 extern struct rpc_procinfo nfs_procedures[];
184 extern __be32 * nfs_decode_dirent(__be32 *, struct nfs_entry *, int);
187 extern struct rpc_procinfo nfs3_procedures[];
188 extern __be32 *nfs3_decode_dirent(__be32 *, struct nfs_entry *, int);
192 extern __be32 *nfs4_decode_dirent(__be32 *p, struct nfs_entry *entry, int plus);
194 #ifdef CONFIG_NFS_V4_1
195 extern const u32 nfs41_maxread_overhead;
196 extern const u32 nfs41_maxwrite_overhead;
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 *, struct writeback_control *);
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,
277 * Determine the device name as a string
279 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
280 const struct dentry *dentry,
281 char *buffer, ssize_t buflen)
283 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
284 dentry, buffer, buflen);
288 * Determine the actual block size (and log2 thereof)
291 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
293 /* make sure blocksize is a power of two */
294 if ((bsize & (bsize - 1)) || nrbitsp) {
295 unsigned char nrbits;
297 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
308 * Calculate the number of 512byte blocks used.
310 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
312 blkcnt_t used = (tsize + 511) >> 9;
313 return (used > ULONG_MAX) ? ULONG_MAX : used;
317 * Compute and set NFS server blocksize
320 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
322 if (bsize < NFS_MIN_FILE_IO_SIZE)
323 bsize = NFS_DEF_FILE_IO_SIZE;
324 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
325 bsize = NFS_MAX_FILE_IO_SIZE;
327 return nfs_block_bits(bsize, nrbitsp);
331 * Determine the maximum file size for a superblock
334 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
336 sb->s_maxbytes = (loff_t)maxfilesize;
337 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
338 sb->s_maxbytes = MAX_LFS_FILESIZE;
342 * Determine the number of bytes of data the page contains
345 unsigned int nfs_page_length(struct page *page)
347 loff_t i_size = i_size_read(page->mapping->host);
350 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
351 if (page->index < end_index)
352 return PAGE_CACHE_SIZE;
353 if (page->index == end_index)
354 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
360 * Determine the number of pages in an array of length 'len' and
361 * with a base offset of 'base'
364 unsigned int nfs_page_array_len(unsigned int base, size_t len)
366 return ((unsigned long)len + (unsigned long)base +
367 PAGE_SIZE - 1) >> PAGE_SHIFT;
371 * Helper for restarting RPC calls in the possible presence of NFSv4.1
374 static inline void nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
376 if (nfs4_has_session(clp))
377 rpc_restart_call_prepare(task);
379 rpc_restart_call(task);