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);
151 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
153 extern void nfs_cleanup_cb_ident_idr(struct net *);
154 extern void nfs_put_client(struct nfs_client *);
155 extern void nfs_free_client(struct nfs_client *);
156 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
157 extern struct nfs_client *
158 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
159 struct nfs4_sessionid *);
160 extern struct nfs_server *nfs_create_server(
161 const struct nfs_parsed_mount_data *,
163 extern struct nfs_server *nfs4_create_server(
164 const struct nfs_parsed_mount_data *,
166 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
168 extern void nfs_free_server(struct nfs_server *server);
169 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
173 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
174 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
175 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
176 const struct sockaddr *ds_addr,
177 int ds_addrlen, int ds_proto,
178 unsigned int ds_timeo,
179 unsigned int ds_retrans);
180 #ifdef CONFIG_PROC_FS
181 extern int __init nfs_fs_proc_init(void);
182 extern void nfs_fs_proc_exit(void);
184 static inline int nfs_fs_proc_init(void)
188 static inline void nfs_fs_proc_exit(void)
194 extern struct svc_version nfs4_callback_version1;
195 extern struct svc_version nfs4_callback_version4;
197 struct nfs_pageio_descriptor;
199 extern int __init nfs_init_nfspagecache(void);
200 extern void nfs_destroy_nfspagecache(void);
201 extern int __init nfs_init_readpagecache(void);
202 extern void nfs_destroy_readpagecache(void);
203 extern int __init nfs_init_writepagecache(void);
204 extern void nfs_destroy_writepagecache(void);
206 extern int __init nfs_init_directcache(void);
207 extern void nfs_destroy_directcache(void);
208 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
209 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
210 struct nfs_pgio_header *hdr,
211 void (*release)(struct nfs_pgio_header *hdr));
212 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
215 extern struct rpc_procinfo nfs_procedures[];
216 extern int nfs2_decode_dirent(struct xdr_stream *,
217 struct nfs_entry *, int);
220 extern struct rpc_procinfo nfs3_procedures[];
221 extern int nfs3_decode_dirent(struct xdr_stream *,
222 struct nfs_entry *, int);
226 extern int nfs4_decode_dirent(struct xdr_stream *,
227 struct nfs_entry *, int);
229 #ifdef CONFIG_NFS_V4_1
230 extern const u32 nfs41_maxread_overhead;
231 extern const u32 nfs41_maxwrite_overhead;
236 extern struct rpc_procinfo nfs4_procedures[];
239 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
242 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
243 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
244 const struct rpc_timeout *timeparms,
245 const char *ip_addr, rpc_authflavor_t authflavour);
248 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
249 struct shrink_control *sc);
250 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
251 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
252 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
253 int nfs_rmdir(struct inode *, struct dentry *);
254 int nfs_unlink(struct inode *, struct dentry *);
255 int nfs_symlink(struct inode *, struct dentry *, const char *);
256 int nfs_link(struct dentry *, struct inode *, struct dentry *);
257 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
258 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
261 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
262 loff_t nfs_file_llseek(struct file *, loff_t, int);
263 int nfs_file_flush(struct file *, fl_owner_t);
264 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
265 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
266 size_t, unsigned int);
267 int nfs_file_mmap(struct file *, struct vm_area_struct *);
268 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
269 int nfs_file_release(struct inode *, struct file *);
270 int nfs_lock(struct file *, int, struct file_lock *);
271 int nfs_flock(struct file *, int, struct file_lock *);
272 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
273 size_t, unsigned int);
274 int nfs_check_flags(int);
275 int nfs_setlease(struct file *, long, struct file_lock **);
278 extern struct workqueue_struct *nfsiod_workqueue;
279 extern struct inode *nfs_alloc_inode(struct super_block *sb);
280 extern void nfs_destroy_inode(struct inode *);
281 extern int nfs_write_inode(struct inode *, struct writeback_control *);
282 extern void nfs_evict_inode(struct inode *);
284 extern void nfs4_evict_inode(struct inode *);
286 void nfs_zap_acl_cache(struct inode *inode);
287 extern int nfs_wait_bit_killable(void *word);
290 extern struct file_system_type nfs_xdev_fs_type;
292 extern struct file_system_type nfs4_xdev_fs_type;
293 extern struct file_system_type nfs4_referral_fs_type;
296 extern struct rpc_stat nfs_rpcstat;
298 extern int __init register_nfs_fs(void);
299 extern void __exit unregister_nfs_fs(void);
300 extern void nfs_sb_active(struct super_block *sb);
301 extern void nfs_sb_deactive(struct super_block *sb);
304 extern char *nfs_path(char **p, struct dentry *dentry,
305 char *buffer, ssize_t buflen);
306 extern struct vfsmount *nfs_d_automount(struct path *path);
307 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
308 struct nfs_fh *, struct nfs_fattr *);
309 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
310 struct nfs_fattr *, rpc_authflavor_t);
313 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
316 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
319 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
322 struct nfs_pgio_completion_ops;
324 extern struct nfs_read_header *nfs_readhdr_alloc(void);
325 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
326 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
328 const struct nfs_pgio_completion_ops *compl_ops);
329 extern int nfs_initiate_read(struct rpc_clnt *clnt,
330 struct nfs_read_data *data,
331 const struct rpc_call_ops *call_ops, int flags);
332 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
333 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
334 struct nfs_pgio_header *hdr);
335 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
337 const struct nfs_pgio_completion_ops *compl_ops);
338 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
339 extern void nfs_readdata_release(struct nfs_read_data *rdata);
342 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
343 struct inode *inode, int ioflags,
344 const struct nfs_pgio_completion_ops *compl_ops);
345 extern struct nfs_write_header *nfs_writehdr_alloc(void);
346 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
347 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
348 struct nfs_pgio_header *hdr);
349 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
350 struct inode *inode, int ioflags,
351 const struct nfs_pgio_completion_ops *compl_ops);
352 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
353 extern void nfs_writedata_release(struct nfs_write_data *wdata);
354 extern void nfs_commit_free(struct nfs_commit_data *p);
355 extern int nfs_initiate_write(struct rpc_clnt *clnt,
356 struct nfs_write_data *data,
357 const struct rpc_call_ops *call_ops,
359 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
360 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
361 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
362 struct nfs_commit_data *data,
363 const struct rpc_call_ops *call_ops,
365 extern void nfs_init_commit(struct nfs_commit_data *data,
366 struct list_head *head,
367 struct pnfs_layout_segment *lseg,
368 struct nfs_commit_info *cinfo);
369 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
370 struct nfs_commit_info *cinfo, int max);
371 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
372 struct nfs_commit_info *cinfo);
373 void nfs_mark_request_commit(struct nfs_page *req,
374 struct pnfs_layout_segment *lseg,
375 struct nfs_commit_info *cinfo);
376 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
377 int how, struct nfs_commit_info *cinfo);
378 void nfs_retry_commit(struct list_head *page_list,
379 struct pnfs_layout_segment *lseg,
380 struct nfs_commit_info *cinfo);
381 void nfs_commitdata_release(struct nfs_commit_data *data);
382 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
383 struct nfs_commit_info *cinfo);
384 void nfs_request_remove_commit_list(struct nfs_page *req,
385 struct nfs_commit_info *cinfo);
386 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
388 struct nfs_direct_req *dreq);
390 #ifdef CONFIG_MIGRATION
391 extern int nfs_migrate_page(struct address_space *,
392 struct page *, struct page *, enum migrate_mode);
394 #define nfs_migrate_page NULL
398 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
399 struct nfs_direct_req *dreq);
400 static inline void nfs_inode_dio_wait(struct inode *inode)
402 inode_dio_wait(inode);
406 extern void __nfs4_read_done_cb(struct nfs_read_data *);
407 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
408 const struct rpc_timeout *timeparms,
410 rpc_authflavor_t authflavour);
411 extern int _nfs4_call_sync(struct rpc_clnt *clnt,
412 struct nfs_server *server,
413 struct rpc_message *msg,
414 struct nfs4_sequence_args *args,
415 struct nfs4_sequence_res *res,
417 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
418 struct nfs_server *server,
419 struct rpc_message *msg,
420 struct nfs4_sequence_args *args,
421 struct nfs4_sequence_res *res,
425 * Determine the device name as a string
427 static inline char *nfs_devname(struct dentry *dentry,
428 char *buffer, ssize_t buflen)
431 return nfs_path(&dummy, dentry, buffer, buflen);
435 * Determine the actual block size (and log2 thereof)
438 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
440 /* make sure blocksize is a power of two */
441 if ((bsize & (bsize - 1)) || nrbitsp) {
442 unsigned char nrbits;
444 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
455 * Calculate the number of 512byte blocks used.
457 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
459 blkcnt_t used = (tsize + 511) >> 9;
460 return (used > ULONG_MAX) ? ULONG_MAX : used;
464 * Compute and set NFS server blocksize
467 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
469 if (bsize < NFS_MIN_FILE_IO_SIZE)
470 bsize = NFS_DEF_FILE_IO_SIZE;
471 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
472 bsize = NFS_MAX_FILE_IO_SIZE;
474 return nfs_block_bits(bsize, nrbitsp);
478 * Determine the maximum file size for a superblock
481 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
483 sb->s_maxbytes = (loff_t)maxfilesize;
484 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
485 sb->s_maxbytes = MAX_LFS_FILESIZE;
489 * Determine the number of bytes of data the page contains
492 unsigned int nfs_page_length(struct page *page)
494 loff_t i_size = i_size_read(page->mapping->host);
497 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
498 if (page->index < end_index)
499 return PAGE_CACHE_SIZE;
500 if (page->index == end_index)
501 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
507 * Convert a umode to a dirent->d_type
510 unsigned char nfs_umode_to_dtype(umode_t mode)
512 return (mode >> 12) & 15;
516 * Determine the number of pages in an array of length 'len' and
517 * with a base offset of 'base'
520 unsigned int nfs_page_array_len(unsigned int base, size_t len)
522 return ((unsigned long)len + (unsigned long)base +
523 PAGE_SIZE - 1) >> PAGE_SHIFT;
527 * Convert a struct timespec into a 64-bit change attribute
529 * This does approximately the same thing as timespec_to_ns(),
530 * but for calculation efficiency, we multiply the seconds by
534 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
536 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;