1
2
3
4
5#include "nfs4_fs.h"
6#include <linux/mount.h>
7#include <linux/security.h>
8#include <linux/crc32.h>
9#include <linux/nfs_page.h>
10
11#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
12
13struct nfs_string;
14
15
16
17
18
19
20
21#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
22
23static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
24{
25 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
26 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
27}
28
29static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
30{
31 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
32 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
33 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
34 return 0;
35 return 1;
36}
37
38struct 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
52
53
54#define NFS_MAX_SECFLAVORS (12)
55
56
57
58
59#define NFS_UNSPEC_PORT (-1)
60
61
62
63
64
65#define NFS_MAX_READDIR_PAGES 8
66
67struct 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
80
81struct 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 struct nfs_auth_info auth_info;
91 rpc_authflavor_t selected_flavor;
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
121struct 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
135struct 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
143extern int nfs_mount(struct nfs_mount_request *info);
144extern void nfs_umount(const struct nfs_mount_request *info);
145
146
147extern const struct rpc_program nfs_program;
148extern void nfs_clients_init(struct net *net);
149extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
150int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
151struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
152 const struct rpc_timeout *, const char *,
153 rpc_authflavor_t);
154int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
155void nfs_server_insert_lists(struct nfs_server *);
156void nfs_server_remove_lists(struct nfs_server *);
157void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
158int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
159 rpc_authflavor_t);
160struct nfs_server *nfs_alloc_server(void);
161void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
162
163extern void nfs_cleanup_cb_ident_idr(struct net *);
164extern void nfs_put_client(struct nfs_client *);
165extern void nfs_free_client(struct nfs_client *);
166extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
167extern struct nfs_client *
168nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
169 struct nfs4_sessionid *, u32);
170extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
171 struct nfs_subversion *);
172extern struct nfs_server *nfs4_create_server(
173 struct nfs_mount_info *,
174 struct nfs_subversion *);
175extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
176 struct nfs_fh *);
177extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
178 struct sockaddr *sap, size_t salen,
179 struct net *net);
180extern void nfs_free_server(struct nfs_server *server);
181extern struct nfs_server *nfs_clone_server(struct nfs_server *,
182 struct nfs_fh *,
183 struct nfs_fattr *,
184 rpc_authflavor_t);
185extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
186extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
187extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
188 const struct sockaddr *ds_addr,
189 int ds_addrlen, int ds_proto,
190 unsigned int ds_timeo,
191 unsigned int ds_retrans,
192 u32 minor_version,
193 rpc_authflavor_t au_flavor);
194extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
195 struct inode *);
196extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp,
197 const struct sockaddr *ds_addr, int ds_addrlen,
198 int ds_proto, unsigned int ds_timeo,
199 unsigned int ds_retrans, rpc_authflavor_t au_flavor);
200#ifdef CONFIG_PROC_FS
201extern int __init nfs_fs_proc_init(void);
202extern void nfs_fs_proc_exit(void);
203extern int nfs_fs_proc_net_init(struct net *net);
204extern void nfs_fs_proc_net_exit(struct net *net);
205#else
206static inline int nfs_fs_proc_net_init(struct net *net)
207{
208 return 0;
209}
210static inline void nfs_fs_proc_net_exit(struct net *net)
211{
212}
213static inline int nfs_fs_proc_init(void)
214{
215 return 0;
216}
217static inline void nfs_fs_proc_exit(void)
218{
219}
220#endif
221
222#ifdef CONFIG_NFS_V4_1
223int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
224#endif
225
226
227extern struct svc_version nfs4_callback_version1;
228extern struct svc_version nfs4_callback_version4;
229
230struct nfs_pageio_descriptor;
231
232extern int __init nfs_init_nfspagecache(void);
233extern void nfs_destroy_nfspagecache(void);
234extern int __init nfs_init_readpagecache(void);
235extern void nfs_destroy_readpagecache(void);
236extern int __init nfs_init_writepagecache(void);
237extern void nfs_destroy_writepagecache(void);
238
239extern int __init nfs_init_directcache(void);
240extern void nfs_destroy_directcache(void);
241extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
242 struct nfs_pgio_header *hdr,
243 void (*release)(struct nfs_pgio_header *hdr));
244void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
245int nfs_iocounter_wait(struct nfs_io_counter *c);
246
247extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
248struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
249void nfs_pgio_header_free(struct nfs_pgio_header *);
250void nfs_pgio_data_destroy(struct nfs_pgio_header *);
251int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
252int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
253 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
254 const struct rpc_call_ops *call_ops, int how, int flags);
255void nfs_free_request(struct nfs_page *req);
256struct nfs_pgio_mirror *
257nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
258
259static inline void nfs_iocounter_init(struct nfs_io_counter *c)
260{
261 c->flags = 0;
262 atomic_set(&c->io_count, 0);
263}
264
265static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
266{
267 WARN_ON_ONCE(desc->pg_mirror_count < 1);
268 return desc->pg_mirror_count > 1;
269}
270
271
272extern struct rpc_procinfo nfs_procedures[];
273extern int nfs2_decode_dirent(struct xdr_stream *,
274 struct nfs_entry *, int);
275
276
277extern struct rpc_procinfo nfs3_procedures[];
278extern int nfs3_decode_dirent(struct xdr_stream *,
279 struct nfs_entry *, int);
280
281
282#if IS_ENABLED(CONFIG_NFS_V4)
283extern int nfs4_decode_dirent(struct xdr_stream *,
284 struct nfs_entry *, int);
285#endif
286#ifdef CONFIG_NFS_V4_1
287extern const u32 nfs41_maxread_overhead;
288extern const u32 nfs41_maxwrite_overhead;
289extern const u32 nfs41_maxgetdevinfo_overhead;
290#endif
291
292
293#if IS_ENABLED(CONFIG_NFS_V4)
294extern struct rpc_procinfo nfs4_procedures[];
295#endif
296
297#ifdef CONFIG_NFS_V4_SECURITY_LABEL
298extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
299static inline void nfs4_label_free(struct nfs4_label *label)
300{
301 if (label) {
302 kfree(label->label);
303 kfree(label);
304 }
305 return;
306}
307
308static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
309{
310 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
311 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
312}
313#else
314static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
315static inline void nfs4_label_free(void *label) {}
316static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
317{
318}
319#endif
320
321
322void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
323extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
324 const struct rpc_timeout *timeparms,
325 const char *ip_addr);
326
327
328extern void nfs_force_use_readdirplus(struct inode *dir);
329extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
330 struct shrink_control *sc);
331extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
332 struct shrink_control *sc);
333struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
334int nfs_create(struct inode *, struct dentry *, umode_t, bool);
335int nfs_mkdir(struct inode *, struct dentry *, umode_t);
336int nfs_rmdir(struct inode *, struct dentry *);
337int nfs_unlink(struct inode *, struct dentry *);
338int nfs_symlink(struct inode *, struct dentry *, const char *);
339int nfs_link(struct dentry *, struct inode *, struct dentry *);
340int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
341int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
342
343
344int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
345loff_t nfs_file_llseek(struct file *, loff_t, int);
346int nfs_file_flush(struct file *, fl_owner_t);
347ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
348ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
349 size_t, unsigned int);
350int nfs_file_mmap(struct file *, struct vm_area_struct *);
351ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
352int nfs_file_release(struct inode *, struct file *);
353int nfs_lock(struct file *, int, struct file_lock *);
354int nfs_flock(struct file *, int, struct file_lock *);
355int nfs_check_flags(int);
356
357
358extern struct workqueue_struct *nfsiod_workqueue;
359extern struct inode *nfs_alloc_inode(struct super_block *sb);
360extern void nfs_destroy_inode(struct inode *);
361extern int nfs_write_inode(struct inode *, struct writeback_control *);
362extern int nfs_drop_inode(struct inode *);
363extern void nfs_clear_inode(struct inode *);
364extern void nfs_evict_inode(struct inode *);
365void nfs_zap_acl_cache(struct inode *inode);
366extern int nfs_wait_bit_killable(struct wait_bit_key *key);
367
368
369extern const struct super_operations nfs_sops;
370extern struct file_system_type nfs_fs_type;
371extern struct file_system_type nfs_xdev_fs_type;
372#if IS_ENABLED(CONFIG_NFS_V4)
373extern struct file_system_type nfs4_xdev_fs_type;
374extern struct file_system_type nfs4_referral_fs_type;
375#endif
376bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
377struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
378 struct nfs_subversion *);
379void nfs_initialise_sb(struct super_block *);
380int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
381int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
382struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
383 struct nfs_mount_info *, struct nfs_subversion *);
384struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
385struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
386 const char *, struct nfs_mount_info *);
387void nfs_kill_super(struct super_block *);
388void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
389
390extern struct rpc_stat nfs_rpcstat;
391
392extern int __init register_nfs_fs(void);
393extern void __exit unregister_nfs_fs(void);
394extern bool nfs_sb_active(struct super_block *sb);
395extern void nfs_sb_deactive(struct super_block *sb);
396
397
398#define NFS_PATH_CANONICAL 1
399extern char *nfs_path(char **p, struct dentry *dentry,
400 char *buffer, ssize_t buflen, unsigned flags);
401extern struct vfsmount *nfs_d_automount(struct path *path);
402struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
403 struct nfs_fh *, struct nfs_fattr *);
404struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
405 struct nfs_fattr *, rpc_authflavor_t);
406
407
408extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
409 const char *);
410#if IS_ENABLED(CONFIG_NFS_V4)
411extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
412 const char *);
413
414extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
415#endif
416
417struct nfs_pgio_completion_ops;
418
419extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
420 struct inode *inode, bool force_mds,
421 const struct nfs_pgio_completion_ops *compl_ops);
422extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
423extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
424
425
426void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
427void nfs_umount_begin(struct super_block *);
428int nfs_statfs(struct dentry *, struct kstatfs *);
429int nfs_show_options(struct seq_file *, struct dentry *);
430int nfs_show_devname(struct seq_file *, struct dentry *);
431int nfs_show_path(struct seq_file *, struct dentry *);
432int nfs_show_stats(struct seq_file *, struct dentry *);
433int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
434
435
436extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
437 struct inode *inode, int ioflags, bool force_mds,
438 const struct nfs_pgio_completion_ops *compl_ops);
439extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
440extern void nfs_commit_free(struct nfs_commit_data *p);
441extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
442extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
443extern int nfs_initiate_commit(struct rpc_clnt *clnt,
444 struct nfs_commit_data *data,
445 const struct nfs_rpc_ops *nfs_ops,
446 const struct rpc_call_ops *call_ops,
447 int how, int flags);
448extern void nfs_init_commit(struct nfs_commit_data *data,
449 struct list_head *head,
450 struct pnfs_layout_segment *lseg,
451 struct nfs_commit_info *cinfo);
452int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
453 struct nfs_commit_info *cinfo, int max);
454unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
455int nfs_scan_commit(struct inode *inode, struct list_head *dst,
456 struct nfs_commit_info *cinfo);
457void nfs_mark_request_commit(struct nfs_page *req,
458 struct pnfs_layout_segment *lseg,
459 struct nfs_commit_info *cinfo,
460 u32 ds_commit_idx);
461int nfs_write_need_commit(struct nfs_pgio_header *);
462void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
463int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
464 int how, struct nfs_commit_info *cinfo);
465void nfs_retry_commit(struct list_head *page_list,
466 struct pnfs_layout_segment *lseg,
467 struct nfs_commit_info *cinfo,
468 u32 ds_commit_idx);
469void nfs_commitdata_release(struct nfs_commit_data *data);
470void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
471 struct nfs_commit_info *cinfo);
472void nfs_request_remove_commit_list(struct nfs_page *req,
473 struct nfs_commit_info *cinfo);
474void nfs_init_cinfo(struct nfs_commit_info *cinfo,
475 struct inode *inode,
476 struct nfs_direct_req *dreq);
477int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
478bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
479void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
480
481#ifdef CONFIG_MIGRATION
482extern int nfs_migrate_page(struct address_space *,
483 struct page *, struct page *, enum migrate_mode);
484#else
485#define nfs_migrate_page NULL
486#endif
487
488
489extern struct rpc_task *
490nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
491 struct dentry *old_dentry, struct dentry *new_dentry,
492 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
493extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
494
495
496void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
497 struct nfs_direct_req *dreq);
498static inline void nfs_inode_dio_wait(struct inode *inode)
499{
500 inode_dio_wait(inode);
501}
502extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
503extern void nfs_direct_set_resched_writes(struct nfs_direct_req *dreq);
504
505
506extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
507extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
508 const struct rpc_timeout *timeparms,
509 const char *ip_addr);
510extern int nfs40_walk_client_list(struct nfs_client *clp,
511 struct nfs_client **result,
512 struct rpc_cred *cred);
513extern int nfs41_walk_client_list(struct nfs_client *clp,
514 struct nfs_client **result,
515 struct rpc_cred *cred);
516
517static inline struct inode *nfs_igrab_and_active(struct inode *inode)
518{
519 inode = igrab(inode);
520 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
521 iput(inode);
522 inode = NULL;
523 }
524 return inode;
525}
526
527static inline void nfs_iput_and_deactive(struct inode *inode)
528{
529 if (inode != NULL) {
530 struct super_block *sb = inode->i_sb;
531
532 iput(inode);
533 nfs_sb_deactive(sb);
534 }
535}
536
537
538
539
540static inline char *nfs_devname(struct dentry *dentry,
541 char *buffer, ssize_t buflen)
542{
543 char *dummy;
544 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
545}
546
547
548
549
550static inline
551unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
552{
553
554 if ((bsize & (bsize - 1)) || nrbitsp) {
555 unsigned char nrbits;
556
557 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
558 ;
559 bsize = 1 << nrbits;
560 if (nrbitsp)
561 *nrbitsp = nrbits;
562 }
563
564 return bsize;
565}
566
567
568
569
570static inline blkcnt_t nfs_calc_block_size(u64 tsize)
571{
572 blkcnt_t used = (tsize + 511) >> 9;
573 return (used > ULONG_MAX) ? ULONG_MAX : used;
574}
575
576
577
578
579static inline
580unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
581{
582 if (bsize < NFS_MIN_FILE_IO_SIZE)
583 bsize = NFS_DEF_FILE_IO_SIZE;
584 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
585 bsize = NFS_MAX_FILE_IO_SIZE;
586
587 return nfs_block_bits(bsize, nrbitsp);
588}
589
590
591
592
593static inline
594void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
595{
596 sb->s_maxbytes = (loff_t)maxfilesize;
597 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
598 sb->s_maxbytes = MAX_LFS_FILESIZE;
599}
600
601
602
603
604static inline
605void nfs_mark_page_unstable(struct page *page)
606{
607 struct inode *inode = page_file_mapping(page)->host;
608
609 inc_zone_page_state(page, NR_UNSTABLE_NFS);
610 inc_bdi_stat(inode_to_bdi(inode), BDI_RECLAIMABLE);
611 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
612}
613
614
615
616
617static inline
618unsigned int nfs_page_length(struct page *page)
619{
620 loff_t i_size = i_size_read(page_file_mapping(page)->host);
621
622 if (i_size > 0) {
623 pgoff_t page_index = page_file_index(page);
624 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
625 if (page_index < end_index)
626 return PAGE_CACHE_SIZE;
627 if (page_index == end_index)
628 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
629 }
630 return 0;
631}
632
633
634
635
636static inline
637unsigned char nfs_umode_to_dtype(umode_t mode)
638{
639 return (mode >> 12) & 15;
640}
641
642
643
644
645
646static inline
647unsigned int nfs_page_array_len(unsigned int base, size_t len)
648{
649 return ((unsigned long)len + (unsigned long)base +
650 PAGE_SIZE - 1) >> PAGE_SHIFT;
651}
652
653
654
655
656
657
658
659
660static inline
661u64 nfs_timespec_to_change_attr(const struct timespec *ts)
662{
663 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
664}
665
666#ifdef CONFIG_CRC32
667
668
669
670
671
672
673
674static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
675{
676 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
677}
678#else
679static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
680{
681 return 0;
682}
683#endif
684
