1/*
  2 * NFS internal definitions
  3 */
  4
  5#include "nfs4_fs.h"
  6#include <linux/mount.h>
  7#include <linux/security.h>
  8#include <linux/crc32.h>
 
 
 
  9
 10#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
 11
 12struct nfs_string;
 13
 14/* Maximum number of readahead requests
 15 * FIXME: this should really be a sysctl so that users may tune it to suit
 16 *        their needs. People that do NFS over a slow network, might for
 17 *        instance want to reduce it to something closer to 1 for improved
 18 *        interactive response.
 19 */
 20#define NFS_MAX_READAHEAD	(RPC_DEF_SLOT_TABLE - 1)
 21
 22static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
 23{
 24	if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
 25		fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
 26}
 27
 28static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
 29{
 30	if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
 31	    (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
 32	     ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
 33		return 0;
 34
 35	fattr->fileid = fattr->mounted_on_fileid;
 36	return 1;
 37}
 38
 39struct nfs_clone_mount {
 40	const struct super_block *sb;
 41	const struct dentry *dentry;
 42	struct nfs_fh *fh;
 43	struct nfs_fattr *fattr;
 44	char *hostname;
 45	char *mnt_path;
 46	struct sockaddr *addr;
 47	size_t addrlen;
 48	rpc_authflavor_t authflavor;
 49};
 
 
 
 
 
 
 
 50
 51/*
 52 * Note: RFC 1813 doesn't limit the number of auth flavors that
 53 * a server can return, so make something up.
 54 */
 55#define NFS_MAX_SECFLAVORS	(12)
 56
 57/*
 58 * Value used if the user did not specify a port value.
 59 */
 60#define NFS_UNSPEC_PORT		(-1)
 61
 62/*
 63 * Maximum number of pages that readdir can use for creating
 64 * a vmapped array of pages.
 65 */
 66#define NFS_MAX_READDIR_PAGES 8
 67
 68struct nfs_client_initdata {
 69	unsigned long init_flags;
 70	const char *hostname;
 71	const struct sockaddr *addr;
 
 
 72	size_t addrlen;
 73	struct nfs_subversion *nfs_mod;
 74	int proto;
 75	u32 minorversion;
 
 
 76	struct net *net;
 
 
 77};
 78
 79/*
 80 * In-kernel mount arguments
 81 */
 82struct nfs_parsed_mount_data {
 83	int			flags;
 
 
 
 
 84	unsigned int		rsize, wsize;
 85	unsigned int		timeo, retrans;
 86	unsigned int		acregmin, acregmax,
 87				acdirmin, acdirmax;
 88	unsigned int		namlen;
 89	unsigned int		options;
 90	unsigned int		bsize;
 91	struct nfs_auth_info	auth_info;
 92	rpc_authflavor_t	selected_flavor;
 93	char			*client_address;
 94	unsigned int		version;
 95	unsigned int		minorversion;
 96	char			*fscache_uniq;
 97	bool			need_mount;
 
 
 98
 99	struct {
100		struct sockaddr_storage	address;
 
 
 
101		size_t			addrlen;
102		char			*hostname;
103		u32			version;
104		int			port;
105		unsigned short		protocol;
106	} mount_server;
107
108	struct {
109		struct sockaddr_storage	address;
 
 
 
110		size_t			addrlen;
111		char			*hostname;
112		char			*export_path;
113		int			port;
114		unsigned short		protocol;
 
 
 
115	} nfs_server;
116
117	struct security_mnt_opts lsm_opts;
118	struct net		*net;
 
 
 
 
 
 
 
 
 
119};
120
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
121/* mount_clnt.c */
122struct nfs_mount_request {
123	struct sockaddr		*sap;
124	size_t			salen;
125	char			*hostname;
126	char			*dirpath;
127	u32			version;
128	unsigned short		protocol;
129	struct nfs_fh		*fh;
130	int			noresvport;
131	unsigned int		*auth_flav_len;
132	rpc_authflavor_t	*auth_flavs;
133	struct net		*net;
134};
135
136struct nfs_mount_info {
137	void (*fill_super)(struct super_block *, struct nfs_mount_info *);
138	int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
139	struct nfs_parsed_mount_data *parsed;
140	struct nfs_clone_mount *cloned;
141	struct nfs_fh *mntfh;
142};
143
144extern int nfs_mount(struct nfs_mount_request *info);
145extern void nfs_umount(const struct nfs_mount_request *info);
146
147/* client.c */
148extern const struct rpc_program nfs_program;
149extern void nfs_clients_init(struct net *net);
 
150extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
151int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
152struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
153				  const struct rpc_timeout *, const char *,
154				  rpc_authflavor_t);
155int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
156void nfs_server_insert_lists(struct nfs_server *);
157void nfs_server_remove_lists(struct nfs_server *);
158void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
159int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
160		rpc_authflavor_t);
161struct nfs_server *nfs_alloc_server(void);
162void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
163
164extern void nfs_cleanup_cb_ident_idr(struct net *);
165extern void nfs_put_client(struct nfs_client *);
166extern void nfs_free_client(struct nfs_client *);
167extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
168extern struct nfs_client *
169nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
170				struct nfs4_sessionid *, u32);
171extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
172					struct nfs_subversion *);
173extern struct nfs_server *nfs4_create_server(
174					struct nfs_mount_info *,
175					struct nfs_subversion *);
176extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
177						      struct nfs_fh *);
178extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
179					struct sockaddr *sap, size_t salen,
180					struct net *net);
181extern void nfs_free_server(struct nfs_server *server);
182extern struct nfs_server *nfs_clone_server(struct nfs_server *,
183					   struct nfs_fh *,
184					   struct nfs_fattr *,
185					   rpc_authflavor_t);
 
 
186extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
187extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
188extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
189					     const struct sockaddr *ds_addr,
190					     int ds_addrlen, int ds_proto,
191					     unsigned int ds_timeo,
192					     unsigned int ds_retrans);
 
193extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
194						struct inode *);
 
 
 
 
195#ifdef CONFIG_PROC_FS
196extern int __init nfs_fs_proc_init(void);
197extern void nfs_fs_proc_exit(void);
 
 
198#else
 
 
 
 
 
 
 
199static inline int nfs_fs_proc_init(void)
200{
201	return 0;
202}
203static inline void nfs_fs_proc_exit(void)
204{
205}
206#endif
207
208#ifdef CONFIG_NFS_V4_1
209int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
210#endif
211
212/* nfs3client.c */
213#if IS_ENABLED(CONFIG_NFS_V3)
214struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *);
215struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *,
216				     struct nfs_fattr *, rpc_authflavor_t);
217#endif
218
219/* callback_xdr.c */
220extern struct svc_version nfs4_callback_version1;
221extern struct svc_version nfs4_callback_version4;
 
 
 
222
223struct nfs_pageio_descriptor;
224/* pagelist.c */
225extern int __init nfs_init_nfspagecache(void);
226extern void nfs_destroy_nfspagecache(void);
227extern int __init nfs_init_readpagecache(void);
228extern void nfs_destroy_readpagecache(void);
229extern int __init nfs_init_writepagecache(void);
230extern void nfs_destroy_writepagecache(void);
231
232extern int __init nfs_init_directcache(void);
233extern void nfs_destroy_directcache(void);
234extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
235extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
236			      struct nfs_pgio_header *hdr,
237			      void (*release)(struct nfs_pgio_header *hdr));
238void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
239int nfs_iocounter_wait(struct nfs_io_counter *c);
 
 
 
 
 
 
 
 
 
 
 
240
241static inline void nfs_iocounter_init(struct nfs_io_counter *c)
 
242{
243	c->flags = 0;
244	atomic_set(&c->io_count, 0);
245}
246
247/* nfs2xdr.c */
248extern struct rpc_procinfo nfs_procedures[];
249extern int nfs2_decode_dirent(struct xdr_stream *,
250				struct nfs_entry *, int);
251
252/* nfs3xdr.c */
253extern struct rpc_procinfo nfs3_procedures[];
254extern int nfs3_decode_dirent(struct xdr_stream *,
255				struct nfs_entry *, int);
256
257/* nfs4xdr.c */
258#if IS_ENABLED(CONFIG_NFS_V4)
259extern int nfs4_decode_dirent(struct xdr_stream *,
260				struct nfs_entry *, int);
261#endif
262#ifdef CONFIG_NFS_V4_1
263extern const u32 nfs41_maxread_overhead;
264extern const u32 nfs41_maxwrite_overhead;
265extern const u32 nfs41_maxgetdevinfo_overhead;
266#endif
267
268/* nfs4proc.c */
269#if IS_ENABLED(CONFIG_NFS_V4)
270extern struct rpc_procinfo nfs4_procedures[];
271#endif
272
273#ifdef CONFIG_NFS_V4_SECURITY_LABEL
274extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
275static inline void nfs4_label_free(struct nfs4_label *label)
 
276{
277	if (label) {
278		kfree(label->label);
279		kfree(label);
280	}
281	return;
 
 
 
 
 
 
 
282}
283
284static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
285{
286	if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
287		nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
288}
289#else
290static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
291static inline void nfs4_label_free(void *label) {}
292static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
293{
294}
 
 
 
 
 
295#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
296
297/* proc.c */
298void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
299extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
300			   const struct rpc_timeout *timeparms,
301			   const char *ip_addr);
302
303/* dir.c */
304extern void nfs_force_use_readdirplus(struct inode *dir);
 
305extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
306					    struct shrink_control *sc);
307extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
308					   struct shrink_control *sc);
309struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
310int nfs_create(struct inode *, struct dentry *, umode_t, bool);
311int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 
 
 
312int nfs_rmdir(struct inode *, struct dentry *);
313int nfs_unlink(struct inode *, struct dentry *);
314int nfs_symlink(struct inode *, struct dentry *, const char *);
 
315int nfs_link(struct dentry *, struct inode *, struct dentry *);
316int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
317int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
318
319/* file.c */
320int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
321loff_t nfs_file_llseek(struct file *, loff_t, int);
322int nfs_file_flush(struct file *, fl_owner_t);
323ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
324ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
325			     size_t, unsigned int);
326int nfs_file_mmap(struct file *, struct vm_area_struct *);
327ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
328int nfs_file_release(struct inode *, struct file *);
329int nfs_lock(struct file *, int, struct file_lock *);
330int nfs_flock(struct file *, int, struct file_lock *);
331ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
332			      size_t, unsigned int);
333int nfs_check_flags(int);
334int nfs_setlease(struct file *, long, struct file_lock **);
335
336/* inode.c */
337extern struct workqueue_struct *nfsiod_workqueue;
338extern struct inode *nfs_alloc_inode(struct super_block *sb);
339extern void nfs_destroy_inode(struct inode *);
340extern int nfs_write_inode(struct inode *, struct writeback_control *);
341extern int nfs_drop_inode(struct inode *);
342extern void nfs_clear_inode(struct inode *);
343extern void nfs_evict_inode(struct inode *);
344void nfs_zap_acl_cache(struct inode *inode);
345extern int nfs_wait_bit_killable(void *word);
 
 
346
347/* super.c */
348extern const struct super_operations nfs_sops;
349extern struct file_system_type nfs_fs_type;
350extern struct file_system_type nfs_xdev_fs_type;
351#if IS_ENABLED(CONFIG_NFS_V4)
352extern struct file_system_type nfs4_xdev_fs_type;
353extern struct file_system_type nfs4_referral_fs_type;
354#endif
355bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
356struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
357			struct nfs_subversion *);
358void nfs_initialise_sb(struct super_block *);
359int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
360int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
361struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
362				   struct nfs_mount_info *, struct nfs_subversion *);
363struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
364struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
365		const char *, struct nfs_mount_info *);
366void nfs_kill_super(struct super_block *);
367void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
368
369extern struct rpc_stat nfs_rpcstat;
370
371extern int __init register_nfs_fs(void);
372extern void __exit unregister_nfs_fs(void);
373extern void nfs_sb_active(struct super_block *sb);
374extern void nfs_sb_deactive(struct super_block *sb);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
375
376/* namespace.c */
377#define NFS_PATH_CANONICAL 1
378extern char *nfs_path(char **p, struct dentry *dentry,
379		      char *buffer, ssize_t buflen, unsigned flags);
380extern struct vfsmount *nfs_d_automount(struct path *path);
381struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
382			      struct nfs_fh *, struct nfs_fattr *);
383struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
384				 struct nfs_fattr *, rpc_authflavor_t);
385
386/* getroot.c */
387extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
388				   const char *);
389#if IS_ENABLED(CONFIG_NFS_V4)
390extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
391				    const char *);
392
393extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
394#endif
395
396struct nfs_pgio_completion_ops;
397/* read.c */
398extern struct nfs_read_header *nfs_readhdr_alloc(void);
399extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
400extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
401			struct inode *inode,
402			const struct nfs_pgio_completion_ops *compl_ops);
403extern int nfs_initiate_read(struct rpc_clnt *clnt,
404			     struct nfs_read_data *data,
405			     const struct rpc_call_ops *call_ops, int flags);
406extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
407extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
408			      struct nfs_pgio_header *hdr);
409extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
410extern void nfs_readdata_release(struct nfs_read_data *rdata);
411
412/* super.c */
413void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
414void nfs_umount_begin(struct super_block *);
415int  nfs_statfs(struct dentry *, struct kstatfs *);
416int  nfs_show_options(struct seq_file *, struct dentry *);
417int  nfs_show_devname(struct seq_file *, struct dentry *);
418int  nfs_show_path(struct seq_file *, struct dentry *);
419int  nfs_show_stats(struct seq_file *, struct dentry *);
420void nfs_put_super(struct super_block *);
421int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
422
423/* write.c */
424extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
425			struct inode *inode, int ioflags,
426			const struct nfs_pgio_completion_ops *compl_ops);
427extern struct nfs_write_header *nfs_writehdr_alloc(void);
428extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
429extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
430			     struct nfs_pgio_header *hdr);
431extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
432extern void nfs_writedata_release(struct nfs_write_data *wdata);
433extern void nfs_commit_free(struct nfs_commit_data *p);
434extern int nfs_initiate_write(struct rpc_clnt *clnt,
435			      struct nfs_write_data *data,
436			      const struct rpc_call_ops *call_ops,
437			      int how, int flags);
438extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
439extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
440extern int nfs_initiate_commit(struct rpc_clnt *clnt,
441			       struct nfs_commit_data *data,
 
442			       const struct rpc_call_ops *call_ops,
443			       int how, int flags);
444extern void nfs_init_commit(struct nfs_commit_data *data,
445			    struct list_head *head,
446			    struct pnfs_layout_segment *lseg,
447			    struct nfs_commit_info *cinfo);
448int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
449			 struct nfs_commit_info *cinfo, int max);
 
450int nfs_scan_commit(struct inode *inode, struct list_head *dst,
451		    struct nfs_commit_info *cinfo);
452void nfs_mark_request_commit(struct nfs_page *req,
453			     struct pnfs_layout_segment *lseg,
454			     struct nfs_commit_info *cinfo);
 
 
 
455int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
456			    int how, struct nfs_commit_info *cinfo);
457void nfs_retry_commit(struct list_head *page_list,
458		      struct pnfs_layout_segment *lseg,
459		      struct nfs_commit_info *cinfo);
 
460void nfs_commitdata_release(struct nfs_commit_data *data);
461void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
462				 struct nfs_commit_info *cinfo);
 
 
 
463void nfs_request_remove_commit_list(struct nfs_page *req,
464				    struct nfs_commit_info *cinfo);
465void nfs_init_cinfo(struct nfs_commit_info *cinfo,
466		    struct inode *inode,
467		    struct nfs_direct_req *dreq);
468int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
469bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
470
471#ifdef CONFIG_MIGRATION
472extern int nfs_migrate_page(struct address_space *,
473		struct page *, struct page *, enum migrate_mode);
474#else
475#define nfs_migrate_page NULL
476#endif
477
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
478/* unlink.c */
479extern struct rpc_task *
480nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
481		 struct dentry *old_dentry, struct dentry *new_dentry,
482		 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
483extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
484
485/* direct.c */
486void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
487			      struct nfs_direct_req *dreq);
488static inline void nfs_inode_dio_wait(struct inode *inode)
489{
490	inode_dio_wait(inode);
491}
492extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
493
494/* nfs4proc.c */
495extern void __nfs4_read_done_cb(struct nfs_read_data *);
496extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
497			    const struct rpc_timeout *timeparms,
498			    const char *ip_addr);
499extern int nfs40_walk_client_list(struct nfs_client *clp,
500				struct nfs_client **result,
501				struct rpc_cred *cred);
502extern int nfs41_walk_client_list(struct nfs_client *clp,
503				struct nfs_client **result,
504				struct rpc_cred *cred);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
505
506/*
507 * Determine the device name as a string
508 */
509static inline char *nfs_devname(struct dentry *dentry,
510				char *buffer, ssize_t buflen)
511{
512	char *dummy;
513	return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
514}
515
516/*
517 * Determine the actual block size (and log2 thereof)
518 */
519static inline
520unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
521{
522	/* make sure blocksize is a power of two */
523	if ((bsize & (bsize - 1)) || nrbitsp) {
524		unsigned char	nrbits;
525
526		for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
527			;
528		bsize = 1 << nrbits;
529		if (nrbitsp)
530			*nrbitsp = nrbits;
531	}
532
533	return bsize;
534}
535
536/*
537 * Calculate the number of 512byte blocks used.
538 */
539static inline blkcnt_t nfs_calc_block_size(u64 tsize)
540{
541	blkcnt_t used = (tsize + 511) >> 9;
542	return (used > ULONG_MAX) ? ULONG_MAX : used;
543}
544
545/*
546 * Compute and set NFS server blocksize
547 */
548static inline
549unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
550{
551	if (bsize < NFS_MIN_FILE_IO_SIZE)
552		bsize = NFS_DEF_FILE_IO_SIZE;
553	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
554		bsize = NFS_MAX_FILE_IO_SIZE;
555
556	return nfs_block_bits(bsize, nrbitsp);
557}
558
559/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
560 * Determine the maximum file size for a superblock
561 */
562static inline
563void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
564{
565	sb->s_maxbytes = (loff_t)maxfilesize;
566	if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
567		sb->s_maxbytes = MAX_LFS_FILESIZE;
568}
569
570/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
571 * Determine the number of bytes of data the page contains
572 */
573static inline
574unsigned int nfs_page_length(struct page *page)
575{
576	loff_t i_size = i_size_read(page_file_mapping(page)->host);
577
578	if (i_size > 0) {
579		pgoff_t page_index = page_file_index(page);
580		pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
581		if (page_index < end_index)
582			return PAGE_CACHE_SIZE;
583		if (page_index == end_index)
584			return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
585	}
586	return 0;
587}
588
589/*
590 * Convert a umode to a dirent->d_type
591 */
592static inline
593unsigned char nfs_umode_to_dtype(umode_t mode)
594{
595	return (mode >> 12) & 15;
596}
597
598/*
599 * Determine the number of pages in an array of length 'len' and
600 * with a base offset of 'base'
601 */
602static inline
603unsigned int nfs_page_array_len(unsigned int base, size_t len)
604{
605	return ((unsigned long)len + (unsigned long)base +
606		PAGE_SIZE - 1) >> PAGE_SHIFT;
607}
608
609/*
610 * Convert a struct timespec into a 64-bit change attribute
611 *
612 * This does approximately the same thing as timespec_to_ns(),
613 * but for calculation efficiency, we multiply the seconds by
614 * 1024*1024*1024.
615 */
616static inline
617u64 nfs_timespec_to_change_attr(const struct timespec *ts)
618{
619	return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
620}
621
622#ifdef CONFIG_CRC32
623/**
624 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
625 * @fh - pointer to filehandle
626 *
627 * returns a crc32 hash for the filehandle that is compatible with
628 * the one displayed by "wireshark".
629 */
630static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
631{
632	return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
633}
 
 
 
 
 
634#else
635static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
636{
637	return 0;
638}
 
 
 
 
639#endif