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_cleanup_cb_ident_idr(void);
132 extern void nfs_put_client(struct nfs_client *);
133 extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
134 extern struct nfs_client *nfs4_find_client_ident(int);
135 extern struct nfs_client *
136 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
137 extern struct nfs_server *nfs_create_server(
138 const struct nfs_parsed_mount_data *,
140 extern struct nfs_server *nfs4_create_server(
141 const struct nfs_parsed_mount_data *,
143 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
145 extern void nfs_free_server(struct nfs_server *server);
146 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
149 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
150 extern int nfs4_check_client_ready(struct nfs_client *clp);
151 #ifdef CONFIG_PROC_FS
152 extern int __init nfs_fs_proc_init(void);
153 extern void nfs_fs_proc_exit(void);
155 static inline int nfs_fs_proc_init(void)
159 static inline void nfs_fs_proc_exit(void)
164 /* nfs4namespace.c */
166 extern struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry);
169 struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentry *dentry)
171 return ERR_PTR(-ENOENT);
176 extern struct svc_version nfs4_callback_version1;
177 extern struct svc_version nfs4_callback_version4;
180 extern int __init nfs_init_nfspagecache(void);
181 extern void nfs_destroy_nfspagecache(void);
182 extern int __init nfs_init_readpagecache(void);
183 extern void nfs_destroy_readpagecache(void);
184 extern int __init nfs_init_writepagecache(void);
185 extern void nfs_destroy_writepagecache(void);
187 extern int __init nfs_init_directcache(void);
188 extern void nfs_destroy_directcache(void);
191 extern int nfs_stat_to_errno(enum nfs_stat);
192 extern struct rpc_procinfo nfs_procedures[];
193 extern int nfs2_decode_dirent(struct xdr_stream *,
194 struct nfs_entry *, int);
197 extern struct rpc_procinfo nfs3_procedures[];
198 extern int nfs3_decode_dirent(struct xdr_stream *,
199 struct nfs_entry *, int);
203 extern int nfs4_decode_dirent(struct xdr_stream *,
204 struct nfs_entry *, int);
206 #ifdef CONFIG_NFS_V4_1
207 extern const u32 nfs41_maxread_overhead;
208 extern const u32 nfs41_maxwrite_overhead;
213 extern struct rpc_procinfo nfs4_procedures[];
217 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
218 extern int nfs_init_client(struct nfs_client *clp,
219 const struct rpc_timeout *timeparms,
220 const char *ip_addr, rpc_authflavor_t authflavour,
224 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
225 int nr_to_scan, gfp_t gfp_mask);
228 extern struct workqueue_struct *nfsiod_workqueue;
229 extern struct inode *nfs_alloc_inode(struct super_block *sb);
230 extern void nfs_destroy_inode(struct inode *);
231 extern int nfs_write_inode(struct inode *, struct writeback_control *);
232 extern void nfs_evict_inode(struct inode *);
234 extern void nfs4_evict_inode(struct inode *);
236 void nfs_zap_acl_cache(struct inode *inode);
237 extern int nfs_wait_bit_killable(void *word);
240 extern struct file_system_type nfs_xdev_fs_type;
242 extern struct file_system_type nfs4_xdev_fs_type;
243 extern struct file_system_type nfs4_referral_fs_type;
246 extern struct rpc_stat nfs_rpcstat;
248 extern int __init register_nfs_fs(void);
249 extern void __exit unregister_nfs_fs(void);
250 extern void nfs_sb_active(struct super_block *sb);
251 extern void nfs_sb_deactive(struct super_block *sb);
254 extern char *nfs_path(const char *base,
255 const struct dentry *droot,
256 const struct dentry *dentry,
257 char *buffer, ssize_t buflen);
258 extern struct vfsmount *nfs_d_automount(struct path *path);
261 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *);
263 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *);
265 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
269 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
272 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
273 #ifdef CONFIG_MIGRATION
274 extern int nfs_migrate_page(struct address_space *,
275 struct page *, struct page *);
277 #define nfs_migrate_page NULL
281 extern int nfs4_init_client(struct nfs_client *clp,
282 const struct rpc_timeout *timeparms,
284 rpc_authflavor_t authflavour,
286 extern int _nfs4_call_sync(struct nfs_server *server,
287 struct rpc_message *msg,
288 struct nfs4_sequence_args *args,
289 struct nfs4_sequence_res *res,
291 extern int _nfs4_call_sync_session(struct nfs_server *server,
292 struct rpc_message *msg,
293 struct nfs4_sequence_args *args,
294 struct nfs4_sequence_res *res,
298 * Determine the device name as a string
300 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
301 const struct dentry *dentry,
302 char *buffer, ssize_t buflen)
304 return nfs_path(mnt_parent->mnt_devname, mnt_parent->mnt_root,
305 dentry, buffer, buflen);
309 * Determine the actual block size (and log2 thereof)
312 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
314 /* make sure blocksize is a power of two */
315 if ((bsize & (bsize - 1)) || nrbitsp) {
316 unsigned char nrbits;
318 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
329 * Calculate the number of 512byte blocks used.
331 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
333 blkcnt_t used = (tsize + 511) >> 9;
334 return (used > ULONG_MAX) ? ULONG_MAX : used;
338 * Compute and set NFS server blocksize
341 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
343 if (bsize < NFS_MIN_FILE_IO_SIZE)
344 bsize = NFS_DEF_FILE_IO_SIZE;
345 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
346 bsize = NFS_MAX_FILE_IO_SIZE;
348 return nfs_block_bits(bsize, nrbitsp);
352 * Determine the maximum file size for a superblock
355 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
357 sb->s_maxbytes = (loff_t)maxfilesize;
358 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
359 sb->s_maxbytes = MAX_LFS_FILESIZE;
363 * Determine the number of bytes of data the page contains
366 unsigned int nfs_page_length(struct page *page)
368 loff_t i_size = i_size_read(page->mapping->host);
371 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
372 if (page->index < end_index)
373 return PAGE_CACHE_SIZE;
374 if (page->index == end_index)
375 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
381 * Convert a umode to a dirent->d_type
384 unsigned char nfs_umode_to_dtype(umode_t mode)
386 return (mode >> 12) & 15;
390 * Determine the number of pages in an array of length 'len' and
391 * with a base offset of 'base'
394 unsigned int nfs_page_array_len(unsigned int base, size_t len)
396 return ((unsigned long)len + (unsigned long)base +
397 PAGE_SIZE - 1) >> PAGE_SHIFT;
401 * Helper for restarting RPC calls in the possible presence of NFSv4.1
404 static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
406 if (nfs4_has_session(clp))
407 return rpc_restart_call_prepare(task);
408 return rpc_restart_call(task);