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 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
44 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
45 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
48 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
50 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
51 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
52 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
55 fattr->fileid = fattr->mounted_on_fileid;
59 struct nfs_clone_mount {
60 const struct super_block *sb;
61 const struct dentry *dentry;
63 struct nfs_fattr *fattr;
66 struct sockaddr *addr;
68 rpc_authflavor_t authflavor;
72 * Note: RFC 1813 doesn't limit the number of auth flavors that
73 * a server can return, so make something up.
75 #define NFS_MAX_SECFLAVORS (12)
78 * Value used if the user did not specify a port value.
80 #define NFS_UNSPEC_PORT (-1)
83 * Maximum number of pages that readdir can use for creating
84 * a vmapped array of pages.
86 #define NFS_MAX_READDIR_PAGES 8
89 * In-kernel mount arguments
91 struct nfs_parsed_mount_data {
95 int acregmin, acregmax,
100 unsigned int auth_flavor_len;
101 rpc_authflavor_t auth_flavors[1];
102 char *client_address;
103 unsigned int version;
104 unsigned int minorversion;
109 struct sockaddr_storage address;
114 unsigned short protocol;
118 struct sockaddr_storage address;
123 unsigned short protocol;
126 struct security_mnt_opts lsm_opts;
131 struct nfs_mount_request {
132 struct sockaddr *sap;
137 unsigned short protocol;
140 unsigned int *auth_flav_len;
141 rpc_authflavor_t *auth_flavs;
145 extern int nfs_mount(struct nfs_mount_request *info);
146 extern void nfs_umount(const struct nfs_mount_request *info);
149 extern const struct rpc_program nfs_program;
150 extern void nfs_clients_init(struct net *net);
152 extern void nfs_cleanup_cb_ident_idr(struct net *);
153 extern void nfs_put_client(struct nfs_client *);
154 extern void nfs_free_client(struct nfs_client *);
155 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
156 extern struct nfs_client *
157 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
158 struct nfs4_sessionid *);
159 extern struct nfs_server *nfs_create_server(
160 const struct nfs_parsed_mount_data *,
162 extern struct nfs_server *nfs4_create_server(
163 const struct nfs_parsed_mount_data *,
165 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
167 extern void nfs_free_server(struct nfs_server *server);
168 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
172 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
173 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
174 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
175 const struct sockaddr *ds_addr,
176 int ds_addrlen, int ds_proto,
177 unsigned int ds_timeo,
178 unsigned int ds_retrans);
179 #ifdef CONFIG_PROC_FS
180 extern int __init nfs_fs_proc_init(void);
181 extern void nfs_fs_proc_exit(void);
183 static inline int nfs_fs_proc_init(void)
187 static inline void nfs_fs_proc_exit(void)
193 extern struct svc_version nfs4_callback_version1;
194 extern struct svc_version nfs4_callback_version4;
196 struct nfs_pageio_descriptor;
198 extern int __init nfs_init_nfspagecache(void);
199 extern void nfs_destroy_nfspagecache(void);
200 extern int __init nfs_init_readpagecache(void);
201 extern void nfs_destroy_readpagecache(void);
202 extern int __init nfs_init_writepagecache(void);
203 extern void nfs_destroy_writepagecache(void);
205 extern int __init nfs_init_directcache(void);
206 extern void nfs_destroy_directcache(void);
207 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
208 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
209 struct nfs_pgio_header *hdr,
210 void (*release)(struct nfs_pgio_header *hdr));
211 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
214 extern struct rpc_procinfo nfs_procedures[];
215 extern int nfs2_decode_dirent(struct xdr_stream *,
216 struct nfs_entry *, int);
219 extern struct rpc_procinfo nfs3_procedures[];
220 extern int nfs3_decode_dirent(struct xdr_stream *,
221 struct nfs_entry *, int);
225 extern int nfs4_decode_dirent(struct xdr_stream *,
226 struct nfs_entry *, int);
228 #ifdef CONFIG_NFS_V4_1
229 extern const u32 nfs41_maxread_overhead;
230 extern const u32 nfs41_maxwrite_overhead;
235 extern struct rpc_procinfo nfs4_procedures[];
238 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
241 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
242 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
243 const struct rpc_timeout *timeparms,
244 const char *ip_addr, rpc_authflavor_t authflavour);
247 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
248 struct shrink_control *sc);
251 extern struct workqueue_struct *nfsiod_workqueue;
252 extern struct inode *nfs_alloc_inode(struct super_block *sb);
253 extern void nfs_destroy_inode(struct inode *);
254 extern int nfs_write_inode(struct inode *, struct writeback_control *);
255 extern void nfs_evict_inode(struct inode *);
257 extern void nfs4_evict_inode(struct inode *);
259 void nfs_zap_acl_cache(struct inode *inode);
260 extern int nfs_wait_bit_killable(void *word);
263 extern struct file_system_type nfs_xdev_fs_type;
265 extern struct file_system_type nfs4_xdev_fs_type;
266 extern struct file_system_type nfs4_referral_fs_type;
269 extern struct rpc_stat nfs_rpcstat;
271 extern int __init register_nfs_fs(void);
272 extern void __exit unregister_nfs_fs(void);
273 extern void nfs_sb_active(struct super_block *sb);
274 extern void nfs_sb_deactive(struct super_block *sb);
277 extern char *nfs_path(char **p, struct dentry *dentry,
278 char *buffer, ssize_t buflen);
279 extern struct vfsmount *nfs_d_automount(struct path *path);
280 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
281 struct nfs_fh *, struct nfs_fattr *);
282 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
283 struct nfs_fattr *, rpc_authflavor_t);
286 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
289 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
292 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
295 struct nfs_pgio_completion_ops;
297 extern struct nfs_read_header *nfs_readhdr_alloc(void);
298 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
299 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
301 const struct nfs_pgio_completion_ops *compl_ops);
302 extern int nfs_initiate_read(struct rpc_clnt *clnt,
303 struct nfs_read_data *data,
304 const struct rpc_call_ops *call_ops, int flags);
305 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
306 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
307 struct nfs_pgio_header *hdr);
308 extern void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
310 const struct nfs_pgio_completion_ops *compl_ops);
311 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
312 extern void nfs_readdata_release(struct nfs_read_data *rdata);
315 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
316 struct inode *inode, int ioflags,
317 const struct nfs_pgio_completion_ops *compl_ops);
318 extern struct nfs_write_header *nfs_writehdr_alloc(void);
319 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
320 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
321 struct nfs_pgio_header *hdr);
322 extern void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
323 struct inode *inode, int ioflags,
324 const struct nfs_pgio_completion_ops *compl_ops);
325 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
326 extern void nfs_writedata_release(struct nfs_write_data *wdata);
327 extern void nfs_commit_free(struct nfs_commit_data *p);
328 extern int nfs_initiate_write(struct rpc_clnt *clnt,
329 struct nfs_write_data *data,
330 const struct rpc_call_ops *call_ops,
332 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
333 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
334 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
335 struct nfs_commit_data *data,
336 const struct rpc_call_ops *call_ops,
338 extern void nfs_init_commit(struct nfs_commit_data *data,
339 struct list_head *head,
340 struct pnfs_layout_segment *lseg,
341 struct nfs_commit_info *cinfo);
342 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
343 struct nfs_commit_info *cinfo, int max);
344 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
345 struct nfs_commit_info *cinfo);
346 void nfs_mark_request_commit(struct nfs_page *req,
347 struct pnfs_layout_segment *lseg,
348 struct nfs_commit_info *cinfo);
349 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
350 int how, struct nfs_commit_info *cinfo);
351 void nfs_retry_commit(struct list_head *page_list,
352 struct pnfs_layout_segment *lseg,
353 struct nfs_commit_info *cinfo);
354 void nfs_commitdata_release(struct nfs_commit_data *data);
355 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
356 struct nfs_commit_info *cinfo);
357 void nfs_request_remove_commit_list(struct nfs_page *req,
358 struct nfs_commit_info *cinfo);
359 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
361 struct nfs_direct_req *dreq);
363 #ifdef CONFIG_MIGRATION
364 extern int nfs_migrate_page(struct address_space *,
365 struct page *, struct page *, enum migrate_mode);
367 #define nfs_migrate_page NULL
371 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
372 struct nfs_direct_req *dreq);
373 static inline void nfs_inode_dio_wait(struct inode *inode)
375 inode_dio_wait(inode);
379 extern void __nfs4_read_done_cb(struct nfs_read_data *);
380 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
381 const struct rpc_timeout *timeparms,
383 rpc_authflavor_t authflavour);
384 extern int _nfs4_call_sync(struct rpc_clnt *clnt,
385 struct nfs_server *server,
386 struct rpc_message *msg,
387 struct nfs4_sequence_args *args,
388 struct nfs4_sequence_res *res,
390 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
391 struct nfs_server *server,
392 struct rpc_message *msg,
393 struct nfs4_sequence_args *args,
394 struct nfs4_sequence_res *res,
398 * Determine the device name as a string
400 static inline char *nfs_devname(struct dentry *dentry,
401 char *buffer, ssize_t buflen)
404 return nfs_path(&dummy, dentry, buffer, buflen);
408 * Determine the actual block size (and log2 thereof)
411 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
413 /* make sure blocksize is a power of two */
414 if ((bsize & (bsize - 1)) || nrbitsp) {
415 unsigned char nrbits;
417 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
428 * Calculate the number of 512byte blocks used.
430 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
432 blkcnt_t used = (tsize + 511) >> 9;
433 return (used > ULONG_MAX) ? ULONG_MAX : used;
437 * Compute and set NFS server blocksize
440 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
442 if (bsize < NFS_MIN_FILE_IO_SIZE)
443 bsize = NFS_DEF_FILE_IO_SIZE;
444 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
445 bsize = NFS_MAX_FILE_IO_SIZE;
447 return nfs_block_bits(bsize, nrbitsp);
451 * Determine the maximum file size for a superblock
454 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
456 sb->s_maxbytes = (loff_t)maxfilesize;
457 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
458 sb->s_maxbytes = MAX_LFS_FILESIZE;
462 * Determine the number of bytes of data the page contains
465 unsigned int nfs_page_length(struct page *page)
467 loff_t i_size = i_size_read(page->mapping->host);
470 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
471 if (page->index < end_index)
472 return PAGE_CACHE_SIZE;
473 if (page->index == end_index)
474 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
480 * Convert a umode to a dirent->d_type
483 unsigned char nfs_umode_to_dtype(umode_t mode)
485 return (mode >> 12) & 15;
489 * Determine the number of pages in an array of length 'len' and
490 * with a base offset of 'base'
493 unsigned int nfs_page_array_len(unsigned int base, size_t len)
495 return ((unsigned long)len + (unsigned long)base +
496 PAGE_SIZE - 1) >> PAGE_SHIFT;
500 * Convert a struct timespec into a 64-bit change attribute
502 * This does approximately the same thing as timespec_to_ns(),
503 * but for calculation efficiency, we multiply the seconds by
507 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
509 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;