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_put_client(struct nfs_client *);
132 extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
133 extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
134 extern struct nfs_server *nfs_create_server(
135 const struct nfs_parsed_mount_data *,
137 extern struct nfs_server *nfs4_create_server(
138 const struct nfs_parsed_mount_data *,
140 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
142 extern void nfs_free_server(struct nfs_server *server);
143 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
146 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
147 extern int nfs4_check_client_ready(struct nfs_client *clp);
148 #ifdef CONFIG_PROC_FS
149 extern int __init nfs_fs_proc_init(void);
150 extern void nfs_fs_proc_exit(void);
152 static inline int nfs_fs_proc_init(void)
156 static inline void nfs_fs_proc_exit(void)
161 /* nfs4namespace.c */
163 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
166 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
168 return ERR_PTR(-ENOENT);
173 extern struct svc_version nfs4_callback_version1;
174 extern struct svc_version nfs4_callback_version4;
177 extern int __init nfs_init_nfspagecache(void);
178 extern void nfs_destroy_nfspagecache(void);
179 extern int __init nfs_init_readpagecache(void);
180 extern void nfs_destroy_readpagecache(void);
181 extern int __init nfs_init_writepagecache(void);
182 extern void nfs_destroy_writepagecache(void);
184 extern int __init nfs_init_directcache(void);
185 extern void nfs_destroy_directcache(void);
188 extern int nfs_stat_to_errno(int);
189 extern struct rpc_procinfo nfs_procedures[];
190 extern __be32 *nfs_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
193 extern struct rpc_procinfo nfs3_procedures[];
194 extern __be32 *nfs3_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
198 extern __be32 *nfs4_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
200 #ifdef CONFIG_NFS_V4_1
201 extern const u32 nfs41_maxread_overhead;
202 extern const u32 nfs41_maxwrite_overhead;
207 extern struct rpc_procinfo nfs4_procedures[];
211 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
214 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
215 int nr_to_scan, gfp_t gfp_mask);
218 extern struct workqueue_struct *nfsiod_workqueue;
219 extern struct inode *nfs_alloc_inode(struct super_block *sb);
220 extern void nfs_destroy_inode(struct inode *);
221 extern int nfs_write_inode(struct inode *, struct writeback_control *);
222 extern void nfs_evict_inode(struct inode *);
224 extern void nfs4_evict_inode(struct inode *);
226 void nfs_zap_acl_cache(struct inode *inode);
227 extern int nfs_wait_bit_killable(void *word);
230 extern struct file_system_type nfs_xdev_fs_type;
232 extern struct file_system_type nfs4_xdev_fs_type;
233 extern struct file_system_type nfs4_referral_fs_type;
236 extern struct rpc_stat nfs_rpcstat;
238 extern int __init register_nfs_fs(void);
239 extern void __exit unregister_nfs_fs(void);
240 extern void nfs_sb_active(struct super_block *sb);
241 extern void nfs_sb_deactive(struct super_block *sb);
244 extern char *nfs_path(const char *base,
245 const struct dentry *droot,
246 const struct dentry *dentry,
247 char *buffer, ssize_t buflen);
250 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
252 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
254 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
258 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
261 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
262 #ifdef CONFIG_MIGRATION
263 extern int nfs_migrate_page(struct address_space *,
264 struct page *, struct page *);
266 #define nfs_migrate_page NULL
270 extern int _nfs4_call_sync(struct nfs_server *server,
271 struct rpc_message *msg,
272 struct nfs4_sequence_args *args,
273 struct nfs4_sequence_res *res,
275 extern int _nfs4_call_sync_session(struct nfs_server *server,
276 struct rpc_message *msg,
277 struct nfs4_sequence_args *args,
278 struct nfs4_sequence_res *res,
282 * Determine the device name as a string
284 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
285 const struct dentry *dentry,
286 char *buffer, ssize_t buflen)
288 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
289 dentry, buffer, buflen);
293 * Determine the actual block size (and log2 thereof)
296 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
298 /* make sure blocksize is a power of two */
299 if ((bsize & (bsize - 1)) || nrbitsp) {
300 unsigned char nrbits;
302 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
313 * Calculate the number of 512byte blocks used.
315 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
317 blkcnt_t used = (tsize + 511) >> 9;
318 return (used > ULONG_MAX) ? ULONG_MAX : used;
322 * Compute and set NFS server blocksize
325 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
327 if (bsize < NFS_MIN_FILE_IO_SIZE)
328 bsize = NFS_DEF_FILE_IO_SIZE;
329 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
330 bsize = NFS_MAX_FILE_IO_SIZE;
332 return nfs_block_bits(bsize, nrbitsp);
336 * Determine the maximum file size for a superblock
339 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
341 sb->s_maxbytes = (loff_t)maxfilesize;
342 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
343 sb->s_maxbytes = MAX_LFS_FILESIZE;
347 * Determine the number of bytes of data the page contains
350 unsigned int nfs_page_length(struct page *page)
352 loff_t i_size = i_size_read(page->mapping->host);
355 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
356 if (page->index < end_index)
357 return PAGE_CACHE_SIZE;
358 if (page->index == end_index)
359 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
365 * Convert a umode to a dirent->d_type
368 unsigned char nfs_umode_to_dtype(umode_t mode)
370 return (mode >> 12) & 15;
374 * Determine the number of pages in an array of length 'len' and
375 * with a base offset of 'base'
378 unsigned int nfs_page_array_len(unsigned int base, size_t len)
380 return ((unsigned long)len + (unsigned long)base +
381 PAGE_SIZE - 1) >> PAGE_SHIFT;
385 * Helper for restarting RPC calls in the possible presence of NFSv4.1
388 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
390 if (nfs4_has_session(clp))
391 return rpc_restart_call_prepare(task);
392 return rpc_restart_call(task);