xref: /linux/fs/nfs/internal.h (revision b889fcf63cb62e7fdb7816565e28f44dbe4a76a5)
1 /*
2  * NFS internal definitions
3  */
4 
5 #include "nfs4_fs.h"
6 #include <linux/mount.h>
7 #include <linux/security.h>
8 
9 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
10 
11 struct nfs_string;
12 
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.
18  */
19 #define NFS_MAX_READAHEAD	(RPC_DEF_SLOT_TABLE - 1)
20 
21 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
22 {
23 	if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
24 		fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
25 }
26 
27 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
28 {
29 	if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
30 	    (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
31 	     ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
32 		return 0;
33 
34 	fattr->fileid = fattr->mounted_on_fileid;
35 	return 1;
36 }
37 
38 struct nfs_clone_mount {
39 	const struct super_block *sb;
40 	const struct dentry *dentry;
41 	struct nfs_fh *fh;
42 	struct nfs_fattr *fattr;
43 	char *hostname;
44 	char *mnt_path;
45 	struct sockaddr *addr;
46 	size_t addrlen;
47 	rpc_authflavor_t authflavor;
48 };
49 
50 /*
51  * Note: RFC 1813 doesn't limit the number of auth flavors that
52  * a server can return, so make something up.
53  */
54 #define NFS_MAX_SECFLAVORS	(12)
55 
56 /*
57  * Value used if the user did not specify a port value.
58  */
59 #define NFS_UNSPEC_PORT		(-1)
60 
61 /*
62  * Maximum number of pages that readdir can use for creating
63  * a vmapped array of pages.
64  */
65 #define NFS_MAX_READDIR_PAGES 8
66 
67 struct nfs_client_initdata {
68 	unsigned long init_flags;
69 	const char *hostname;
70 	const struct sockaddr *addr;
71 	size_t addrlen;
72 	struct nfs_subversion *nfs_mod;
73 	int proto;
74 	u32 minorversion;
75 	struct net *net;
76 };
77 
78 /*
79  * In-kernel mount arguments
80  */
81 struct nfs_parsed_mount_data {
82 	int			flags;
83 	unsigned int		rsize, wsize;
84 	unsigned int		timeo, retrans;
85 	unsigned int		acregmin, acregmax,
86 				acdirmin, acdirmax;
87 	unsigned int		namlen;
88 	unsigned int		options;
89 	unsigned int		bsize;
90 	unsigned int		auth_flavor_len;
91 	rpc_authflavor_t	auth_flavors[1];
92 	char			*client_address;
93 	unsigned int		version;
94 	unsigned int		minorversion;
95 	char			*fscache_uniq;
96 	bool			need_mount;
97 
98 	struct {
99 		struct sockaddr_storage	address;
100 		size_t			addrlen;
101 		char			*hostname;
102 		u32			version;
103 		int			port;
104 		unsigned short		protocol;
105 	} mount_server;
106 
107 	struct {
108 		struct sockaddr_storage	address;
109 		size_t			addrlen;
110 		char			*hostname;
111 		char			*export_path;
112 		int			port;
113 		unsigned short		protocol;
114 	} nfs_server;
115 
116 	struct security_mnt_opts lsm_opts;
117 	struct net		*net;
118 };
119 
120 /* mount_clnt.c */
121 struct nfs_mount_request {
122 	struct sockaddr		*sap;
123 	size_t			salen;
124 	char			*hostname;
125 	char			*dirpath;
126 	u32			version;
127 	unsigned short		protocol;
128 	struct nfs_fh		*fh;
129 	int			noresvport;
130 	unsigned int		*auth_flav_len;
131 	rpc_authflavor_t	*auth_flavs;
132 	struct net		*net;
133 };
134 
135 struct nfs_mount_info {
136 	void (*fill_super)(struct super_block *, struct nfs_mount_info *);
137 	int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
138 	struct nfs_parsed_mount_data *parsed;
139 	struct nfs_clone_mount *cloned;
140 	struct nfs_fh *mntfh;
141 };
142 
143 extern int nfs_mount(struct nfs_mount_request *info);
144 extern void nfs_umount(const struct nfs_mount_request *info);
145 
146 /* client.c */
147 extern const struct rpc_program nfs_program;
148 extern void nfs_clients_init(struct net *net);
149 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
150 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
151 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
152 				  const struct rpc_timeout *, const char *,
153 				  rpc_authflavor_t);
154 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
155 void nfs_server_insert_lists(struct nfs_server *);
156 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
157 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
158 		rpc_authflavor_t);
159 struct nfs_server *nfs_alloc_server(void);
160 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
161 
162 extern void nfs_cleanup_cb_ident_idr(struct net *);
163 extern void nfs_put_client(struct nfs_client *);
164 extern void nfs_free_client(struct nfs_client *);
165 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
166 extern struct nfs_client *
167 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
168 				struct nfs4_sessionid *);
169 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
170 					struct nfs_subversion *);
171 extern struct nfs_server *nfs4_create_server(
172 					struct nfs_mount_info *,
173 					struct nfs_subversion *);
174 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
175 						      struct nfs_fh *);
176 extern void nfs_free_server(struct nfs_server *server);
177 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
178 					   struct nfs_fh *,
179 					   struct nfs_fattr *,
180 					   rpc_authflavor_t);
181 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
182 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
183 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
184 					     const struct sockaddr *ds_addr,
185 					     int ds_addrlen, int ds_proto,
186 					     unsigned int ds_timeo,
187 					     unsigned int ds_retrans);
188 #ifdef CONFIG_PROC_FS
189 extern int __init nfs_fs_proc_init(void);
190 extern void nfs_fs_proc_exit(void);
191 #else
192 static inline int nfs_fs_proc_init(void)
193 {
194 	return 0;
195 }
196 static inline void nfs_fs_proc_exit(void)
197 {
198 }
199 #endif
200 
201 #ifdef CONFIG_NFS_V4_1
202 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
203 #endif
204 
205 /* nfs3client.c */
206 #if IS_ENABLED(CONFIG_NFS_V3)
207 struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *);
208 struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *,
209 				     struct nfs_fattr *, rpc_authflavor_t);
210 #endif
211 
212 /* callback_xdr.c */
213 extern struct svc_version nfs4_callback_version1;
214 extern struct svc_version nfs4_callback_version4;
215 
216 struct nfs_pageio_descriptor;
217 /* pagelist.c */
218 extern int __init nfs_init_nfspagecache(void);
219 extern void nfs_destroy_nfspagecache(void);
220 extern int __init nfs_init_readpagecache(void);
221 extern void nfs_destroy_readpagecache(void);
222 extern int __init nfs_init_writepagecache(void);
223 extern void nfs_destroy_writepagecache(void);
224 
225 extern int __init nfs_init_directcache(void);
226 extern void nfs_destroy_directcache(void);
227 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
228 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
229 			      struct nfs_pgio_header *hdr,
230 			      void (*release)(struct nfs_pgio_header *hdr));
231 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
232 
233 /* nfs2xdr.c */
234 extern struct rpc_procinfo nfs_procedures[];
235 extern int nfs2_decode_dirent(struct xdr_stream *,
236 				struct nfs_entry *, int);
237 
238 /* nfs3xdr.c */
239 extern struct rpc_procinfo nfs3_procedures[];
240 extern int nfs3_decode_dirent(struct xdr_stream *,
241 				struct nfs_entry *, int);
242 
243 /* nfs4xdr.c */
244 #if IS_ENABLED(CONFIG_NFS_V4)
245 extern int nfs4_decode_dirent(struct xdr_stream *,
246 				struct nfs_entry *, int);
247 #endif
248 #ifdef CONFIG_NFS_V4_1
249 extern const u32 nfs41_maxread_overhead;
250 extern const u32 nfs41_maxwrite_overhead;
251 #endif
252 
253 /* nfs4proc.c */
254 #if IS_ENABLED(CONFIG_NFS_V4)
255 extern struct rpc_procinfo nfs4_procedures[];
256 #endif
257 
258 /* proc.c */
259 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
260 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
261 			   const struct rpc_timeout *timeparms,
262 			   const char *ip_addr, rpc_authflavor_t authflavour);
263 
264 /* dir.c */
265 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
266 					struct shrink_control *sc);
267 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
268 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
269 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
270 int nfs_rmdir(struct inode *, struct dentry *);
271 int nfs_unlink(struct inode *, struct dentry *);
272 int nfs_symlink(struct inode *, struct dentry *, const char *);
273 int nfs_link(struct dentry *, struct inode *, struct dentry *);
274 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
275 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
276 
277 /* file.c */
278 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
279 loff_t nfs_file_llseek(struct file *, loff_t, int);
280 int nfs_file_flush(struct file *, fl_owner_t);
281 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
282 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
283 			     size_t, unsigned int);
284 int nfs_file_mmap(struct file *, struct vm_area_struct *);
285 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
286 int nfs_file_release(struct inode *, struct file *);
287 int nfs_lock(struct file *, int, struct file_lock *);
288 int nfs_flock(struct file *, int, struct file_lock *);
289 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
290 			      size_t, unsigned int);
291 int nfs_check_flags(int);
292 int nfs_setlease(struct file *, long, struct file_lock **);
293 
294 /* inode.c */
295 extern struct workqueue_struct *nfsiod_workqueue;
296 extern struct inode *nfs_alloc_inode(struct super_block *sb);
297 extern void nfs_destroy_inode(struct inode *);
298 extern int nfs_write_inode(struct inode *, struct writeback_control *);
299 extern int nfs_drop_inode(struct inode *);
300 extern void nfs_clear_inode(struct inode *);
301 extern void nfs_evict_inode(struct inode *);
302 void nfs_zap_acl_cache(struct inode *inode);
303 extern int nfs_wait_bit_killable(void *word);
304 
305 /* super.c */
306 extern const struct super_operations nfs_sops;
307 extern struct file_system_type nfs_fs_type;
308 extern struct file_system_type nfs_xdev_fs_type;
309 #if IS_ENABLED(CONFIG_NFS_V4)
310 extern struct file_system_type nfs4_xdev_fs_type;
311 extern struct file_system_type nfs4_referral_fs_type;
312 #endif
313 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
314 			struct nfs_subversion *);
315 void nfs_initialise_sb(struct super_block *);
316 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
317 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
318 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
319 				   struct nfs_mount_info *, struct nfs_subversion *);
320 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
321 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
322 		const char *, struct nfs_mount_info *);
323 void nfs_kill_super(struct super_block *);
324 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
325 
326 extern struct rpc_stat nfs_rpcstat;
327 
328 extern int __init register_nfs_fs(void);
329 extern void __exit unregister_nfs_fs(void);
330 extern void nfs_sb_active(struct super_block *sb);
331 extern void nfs_sb_deactive(struct super_block *sb);
332 extern void nfs_sb_deactive_async(struct super_block *sb);
333 
334 /* namespace.c */
335 #define NFS_PATH_CANONICAL 1
336 extern char *nfs_path(char **p, struct dentry *dentry,
337 		      char *buffer, ssize_t buflen, unsigned flags);
338 extern struct vfsmount *nfs_d_automount(struct path *path);
339 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
340 			      struct nfs_fh *, struct nfs_fattr *);
341 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
342 				 struct nfs_fattr *, rpc_authflavor_t);
343 
344 /* getroot.c */
345 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
346 				   const char *);
347 #if IS_ENABLED(CONFIG_NFS_V4)
348 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
349 				    const char *);
350 
351 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
352 #endif
353 
354 struct nfs_pgio_completion_ops;
355 /* read.c */
356 extern struct nfs_read_header *nfs_readhdr_alloc(void);
357 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
358 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
359 			struct inode *inode,
360 			const struct nfs_pgio_completion_ops *compl_ops);
361 extern int nfs_initiate_read(struct rpc_clnt *clnt,
362 			     struct nfs_read_data *data,
363 			     const struct rpc_call_ops *call_ops, int flags);
364 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
365 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
366 			      struct nfs_pgio_header *hdr);
367 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
368 extern void nfs_readdata_release(struct nfs_read_data *rdata);
369 
370 /* super.c */
371 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
372 void nfs_umount_begin(struct super_block *);
373 int  nfs_statfs(struct dentry *, struct kstatfs *);
374 int  nfs_show_options(struct seq_file *, struct dentry *);
375 int  nfs_show_devname(struct seq_file *, struct dentry *);
376 int  nfs_show_path(struct seq_file *, struct dentry *);
377 int  nfs_show_stats(struct seq_file *, struct dentry *);
378 void nfs_put_super(struct super_block *);
379 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
380 
381 /* write.c */
382 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
383 			struct inode *inode, int ioflags,
384 			const struct nfs_pgio_completion_ops *compl_ops);
385 extern struct nfs_write_header *nfs_writehdr_alloc(void);
386 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
387 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
388 			     struct nfs_pgio_header *hdr);
389 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
390 extern void nfs_writedata_release(struct nfs_write_data *wdata);
391 extern void nfs_commit_free(struct nfs_commit_data *p);
392 extern int nfs_initiate_write(struct rpc_clnt *clnt,
393 			      struct nfs_write_data *data,
394 			      const struct rpc_call_ops *call_ops,
395 			      int how, int flags);
396 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
397 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
398 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
399 			       struct nfs_commit_data *data,
400 			       const struct rpc_call_ops *call_ops,
401 			       int how, int flags);
402 extern void nfs_init_commit(struct nfs_commit_data *data,
403 			    struct list_head *head,
404 			    struct pnfs_layout_segment *lseg,
405 			    struct nfs_commit_info *cinfo);
406 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
407 			 struct nfs_commit_info *cinfo, int max);
408 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
409 		    struct nfs_commit_info *cinfo);
410 void nfs_mark_request_commit(struct nfs_page *req,
411 			     struct pnfs_layout_segment *lseg,
412 			     struct nfs_commit_info *cinfo);
413 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
414 			    int how, struct nfs_commit_info *cinfo);
415 void nfs_retry_commit(struct list_head *page_list,
416 		      struct pnfs_layout_segment *lseg,
417 		      struct nfs_commit_info *cinfo);
418 void nfs_commitdata_release(struct nfs_commit_data *data);
419 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
420 				 struct nfs_commit_info *cinfo);
421 void nfs_request_remove_commit_list(struct nfs_page *req,
422 				    struct nfs_commit_info *cinfo);
423 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
424 		    struct inode *inode,
425 		    struct nfs_direct_req *dreq);
426 
427 #ifdef CONFIG_MIGRATION
428 extern int nfs_migrate_page(struct address_space *,
429 		struct page *, struct page *, enum migrate_mode);
430 #else
431 #define nfs_migrate_page NULL
432 #endif
433 
434 /* direct.c */
435 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
436 			      struct nfs_direct_req *dreq);
437 static inline void nfs_inode_dio_wait(struct inode *inode)
438 {
439 	inode_dio_wait(inode);
440 }
441 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
442 
443 /* nfs4proc.c */
444 extern void __nfs4_read_done_cb(struct nfs_read_data *);
445 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
446 			    const struct rpc_timeout *timeparms,
447 			    const char *ip_addr,
448 			    rpc_authflavor_t authflavour);
449 extern int nfs40_walk_client_list(struct nfs_client *clp,
450 				struct nfs_client **result,
451 				struct rpc_cred *cred);
452 extern int nfs41_walk_client_list(struct nfs_client *clp,
453 				struct nfs_client **result,
454 				struct rpc_cred *cred);
455 
456 /*
457  * Determine the device name as a string
458  */
459 static inline char *nfs_devname(struct dentry *dentry,
460 				char *buffer, ssize_t buflen)
461 {
462 	char *dummy;
463 	return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
464 }
465 
466 /*
467  * Determine the actual block size (and log2 thereof)
468  */
469 static inline
470 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
471 {
472 	/* make sure blocksize is a power of two */
473 	if ((bsize & (bsize - 1)) || nrbitsp) {
474 		unsigned char	nrbits;
475 
476 		for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
477 			;
478 		bsize = 1 << nrbits;
479 		if (nrbitsp)
480 			*nrbitsp = nrbits;
481 	}
482 
483 	return bsize;
484 }
485 
486 /*
487  * Calculate the number of 512byte blocks used.
488  */
489 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
490 {
491 	blkcnt_t used = (tsize + 511) >> 9;
492 	return (used > ULONG_MAX) ? ULONG_MAX : used;
493 }
494 
495 /*
496  * Compute and set NFS server blocksize
497  */
498 static inline
499 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
500 {
501 	if (bsize < NFS_MIN_FILE_IO_SIZE)
502 		bsize = NFS_DEF_FILE_IO_SIZE;
503 	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
504 		bsize = NFS_MAX_FILE_IO_SIZE;
505 
506 	return nfs_block_bits(bsize, nrbitsp);
507 }
508 
509 /*
510  * Determine the maximum file size for a superblock
511  */
512 static inline
513 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
514 {
515 	sb->s_maxbytes = (loff_t)maxfilesize;
516 	if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
517 		sb->s_maxbytes = MAX_LFS_FILESIZE;
518 }
519 
520 /*
521  * Determine the number of bytes of data the page contains
522  */
523 static inline
524 unsigned int nfs_page_length(struct page *page)
525 {
526 	loff_t i_size = i_size_read(page_file_mapping(page)->host);
527 
528 	if (i_size > 0) {
529 		pgoff_t page_index = page_file_index(page);
530 		pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
531 		if (page_index < end_index)
532 			return PAGE_CACHE_SIZE;
533 		if (page_index == end_index)
534 			return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
535 	}
536 	return 0;
537 }
538 
539 /*
540  * Convert a umode to a dirent->d_type
541  */
542 static inline
543 unsigned char nfs_umode_to_dtype(umode_t mode)
544 {
545 	return (mode >> 12) & 15;
546 }
547 
548 /*
549  * Determine the number of pages in an array of length 'len' and
550  * with a base offset of 'base'
551  */
552 static inline
553 unsigned int nfs_page_array_len(unsigned int base, size_t len)
554 {
555 	return ((unsigned long)len + (unsigned long)base +
556 		PAGE_SIZE - 1) >> PAGE_SHIFT;
557 }
558 
559 /*
560  * Convert a struct timespec into a 64-bit change attribute
561  *
562  * This does approximately the same thing as timespec_to_ns(),
563  * but for calculation efficiency, we multiply the seconds by
564  * 1024*1024*1024.
565  */
566 static inline
567 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
568 {
569 	return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
570 }
571