1 /* SPDX-License-Identifier: GPL-2.0 */
3 * NFS internal definitions
7 #include <linux/mount.h>
8 #include <linux/security.h>
9 #include <linux/crc32.h>
10 #include <linux/sunrpc/addr.h>
11 #include <linux/nfs_page.h>
12 #include <linux/wait_bit.h>
14 #define NFS_MS_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
16 extern const struct export_operations nfs_export_ops;
20 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
22 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
23 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
26 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
28 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
29 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
30 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
35 struct nfs_clone_mount {
36 const struct super_block *sb;
37 const struct dentry *dentry;
40 struct sockaddr *addr;
42 rpc_authflavor_t authflavor;
46 * Note: RFC 1813 doesn't limit the number of auth flavors that
47 * a server can return, so make something up.
49 #define NFS_MAX_SECFLAVORS (12)
52 * Value used if the user did not specify a port value.
54 #define NFS_UNSPEC_PORT (-1)
56 #define NFS_UNSPEC_RETRANS (UINT_MAX)
57 #define NFS_UNSPEC_TIMEO (UINT_MAX)
60 * Maximum number of pages that readdir can use for creating
61 * a vmapped array of pages.
63 #define NFS_MAX_READDIR_PAGES 8
65 struct nfs_client_initdata {
66 unsigned long init_flags;
67 const char *hostname; /* Hostname of the server */
68 const struct sockaddr *addr; /* Address of the server */
69 const char *nodename; /* Hostname of the client */
70 const char *ip_addr; /* IP address of the client */
72 struct nfs_subversion *nfs_mod;
75 unsigned int nconnect;
77 const struct rpc_timeout *timeparms;
78 const struct cred *cred;
82 * In-kernel mount arguments
84 struct nfs_fs_context {
86 unsigned int rsize, wsize;
87 unsigned int timeo, retrans;
88 unsigned int acregmin, acregmax,
93 struct nfs_auth_info auth_info;
94 rpc_authflavor_t selected_flavor;
97 unsigned int minorversion;
99 unsigned short protofamily;
100 unsigned short mountfamily;
105 struct sockaddr_storage address;
110 unsigned short protocol;
114 struct sockaddr_storage address;
119 unsigned short protocol;
120 unsigned short nconnect;
126 char buf[32]; /* Parse buffer */
130 struct nfs_mount_request {
131 struct sockaddr *sap;
136 unsigned short protocol;
139 unsigned int *auth_flav_len;
140 rpc_authflavor_t *auth_flavs;
144 struct nfs_mount_info {
145 unsigned int inherited_bsize;
146 struct nfs_fs_context *ctx;
147 struct nfs_clone_mount *cloned;
148 struct nfs_server *server;
149 struct nfs_fh *mntfh;
150 struct nfs_subversion *nfs_mod;
153 extern int nfs_mount(struct nfs_mount_request *info);
154 extern void nfs_umount(const struct nfs_mount_request *info);
157 extern const struct rpc_program nfs_program;
158 extern void nfs_clients_init(struct net *net);
159 extern void nfs_clients_exit(struct net *net);
160 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
161 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
162 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
163 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
164 void nfs_server_insert_lists(struct nfs_server *);
165 void nfs_server_remove_lists(struct nfs_server *);
166 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
167 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
169 struct nfs_server *nfs_alloc_server(void);
170 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
172 extern void nfs_put_client(struct nfs_client *);
173 extern void nfs_free_client(struct nfs_client *);
174 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
175 extern struct nfs_client *
176 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
177 struct nfs4_sessionid *, u32);
178 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *);
179 extern struct nfs_server *nfs4_create_server(struct nfs_mount_info *);
180 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
182 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
183 struct sockaddr *sap, size_t salen,
185 extern void nfs_free_server(struct nfs_server *server);
186 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
190 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
191 extern int nfs_client_init_status(const struct nfs_client *clp);
192 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
193 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
194 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
195 const struct sockaddr *ds_addr,
196 int ds_addrlen, int ds_proto,
197 unsigned int ds_timeo,
198 unsigned int ds_retrans,
200 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
202 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
203 const struct sockaddr *ds_addr, int ds_addrlen,
204 int ds_proto, unsigned int ds_timeo,
205 unsigned int ds_retrans);
206 #ifdef CONFIG_PROC_FS
207 extern int __init nfs_fs_proc_init(void);
208 extern void nfs_fs_proc_exit(void);
209 extern int nfs_fs_proc_net_init(struct net *net);
210 extern void nfs_fs_proc_net_exit(struct net *net);
212 static inline int nfs_fs_proc_net_init(struct net *net)
216 static inline void nfs_fs_proc_net_exit(struct net *net)
219 static inline int nfs_fs_proc_init(void)
223 static inline void nfs_fs_proc_exit(void)
229 extern const struct svc_version nfs4_callback_version1;
230 extern const struct svc_version nfs4_callback_version4;
232 struct nfs_pageio_descriptor;
235 #define NFS_TEXT_DATA 1
237 extern struct nfs_fs_context *nfs_alloc_parsed_mount_data(void);
238 extern void nfs_free_parsed_mount_data(struct nfs_fs_context *ctx);
239 extern int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx);
240 extern int nfs_validate_mount_data(struct file_system_type *fs_type,
242 struct nfs_fs_context *ctx,
243 struct nfs_fh *mntfh,
244 const char *dev_name);
245 extern int nfs_validate_text_mount_data(void *options,
246 struct nfs_fs_context *ctx,
247 const char *dev_name);
250 extern int __init nfs_init_nfspagecache(void);
251 extern void nfs_destroy_nfspagecache(void);
252 extern int __init nfs_init_readpagecache(void);
253 extern void nfs_destroy_readpagecache(void);
254 extern int __init nfs_init_writepagecache(void);
255 extern void nfs_destroy_writepagecache(void);
257 extern int __init nfs_init_directcache(void);
258 extern void nfs_destroy_directcache(void);
259 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
260 struct nfs_pgio_header *hdr,
261 void (*release)(struct nfs_pgio_header *hdr));
262 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
263 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
265 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
266 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
267 void nfs_pgio_header_free(struct nfs_pgio_header *);
268 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
269 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
270 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
271 const struct rpc_call_ops *call_ops, int how, int flags);
272 void nfs_free_request(struct nfs_page *req);
273 struct nfs_pgio_mirror *
274 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
276 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
278 WARN_ON_ONCE(desc->pg_mirror_count < 1);
279 return desc->pg_mirror_count > 1;
282 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
283 const struct nfs_open_context *ctx2)
285 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
289 extern const struct rpc_procinfo nfs_procedures[];
290 extern int nfs2_decode_dirent(struct xdr_stream *,
291 struct nfs_entry *, bool);
294 extern const struct rpc_procinfo nfs3_procedures[];
295 extern int nfs3_decode_dirent(struct xdr_stream *,
296 struct nfs_entry *, bool);
299 #if IS_ENABLED(CONFIG_NFS_V4)
300 extern int nfs4_decode_dirent(struct xdr_stream *,
301 struct nfs_entry *, bool);
303 #ifdef CONFIG_NFS_V4_1
304 extern const u32 nfs41_maxread_overhead;
305 extern const u32 nfs41_maxwrite_overhead;
306 extern const u32 nfs41_maxgetdevinfo_overhead;
310 #if IS_ENABLED(CONFIG_NFS_V4)
311 extern const struct rpc_procinfo nfs4_procedures[];
314 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
315 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
316 static inline struct nfs4_label *
317 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
322 if (src->len > NFS4_MAXLABELLEN)
328 memcpy(dst->label, src->label, src->len);
332 static inline void nfs4_label_free(struct nfs4_label *label)
341 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
343 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
344 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
347 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
348 static inline void nfs4_label_free(void *label) {}
349 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
352 static inline struct nfs4_label *
353 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
357 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
360 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
361 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
362 const struct nfs_client_initdata *);
365 extern void nfs_advise_use_readdirplus(struct inode *dir);
366 extern void nfs_force_use_readdirplus(struct inode *dir);
367 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
368 struct shrink_control *sc);
369 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
370 struct shrink_control *sc);
371 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
372 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
373 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
374 int nfs_rmdir(struct inode *, struct dentry *);
375 int nfs_unlink(struct inode *, struct dentry *);
376 int nfs_symlink(struct inode *, struct dentry *, const char *);
377 int nfs_link(struct dentry *, struct inode *, struct dentry *);
378 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
379 int nfs_rename(struct inode *, struct dentry *,
380 struct inode *, struct dentry *, unsigned int);
383 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
384 loff_t nfs_file_llseek(struct file *, loff_t, int);
385 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
386 int nfs_file_mmap(struct file *, struct vm_area_struct *);
387 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
388 int nfs_file_release(struct inode *, struct file *);
389 int nfs_lock(struct file *, int, struct file_lock *);
390 int nfs_flock(struct file *, int, struct file_lock *);
391 int nfs_check_flags(int);
394 extern struct workqueue_struct *nfsiod_workqueue;
395 extern struct inode *nfs_alloc_inode(struct super_block *sb);
396 extern void nfs_free_inode(struct inode *);
397 extern int nfs_write_inode(struct inode *, struct writeback_control *);
398 extern int nfs_drop_inode(struct inode *);
399 extern void nfs_clear_inode(struct inode *);
400 extern void nfs_evict_inode(struct inode *);
401 void nfs_zap_acl_cache(struct inode *inode);
402 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
403 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
404 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
407 extern const struct super_operations nfs_sops;
408 extern struct file_system_type nfs_fs_type;
409 extern struct file_system_type nfs_prepared_fs_type;
410 #if IS_ENABLED(CONFIG_NFS_V4)
411 extern struct file_system_type nfs4_referral_fs_type;
413 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
414 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *);
415 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
416 void nfs_kill_super(struct super_block *);
418 extern struct rpc_stat nfs_rpcstat;
420 extern int __init register_nfs_fs(void);
421 extern void __exit unregister_nfs_fs(void);
422 extern bool nfs_sb_active(struct super_block *sb);
423 extern void nfs_sb_deactive(struct super_block *sb);
426 extern void nfs_start_io_read(struct inode *inode);
427 extern void nfs_end_io_read(struct inode *inode);
428 extern void nfs_start_io_write(struct inode *inode);
429 extern void nfs_end_io_write(struct inode *inode);
430 extern void nfs_start_io_direct(struct inode *inode);
431 extern void nfs_end_io_direct(struct inode *inode);
433 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
435 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
439 #define NFS_PATH_CANONICAL 1
440 extern char *nfs_path(char **p, struct dentry *dentry,
441 char *buffer, ssize_t buflen, unsigned flags);
442 extern struct vfsmount *nfs_d_automount(struct path *path);
443 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
444 struct nfs_fh *, struct nfs_fattr *);
445 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
446 struct nfs_fattr *, rpc_authflavor_t);
449 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
451 #if IS_ENABLED(CONFIG_NFS_V4)
452 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
455 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
458 struct nfs_pgio_completion_ops;
460 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
461 struct inode *inode, bool force_mds,
462 const struct nfs_pgio_completion_ops *compl_ops);
463 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
464 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
467 void nfs_umount_begin(struct super_block *);
468 int nfs_statfs(struct dentry *, struct kstatfs *);
469 int nfs_show_options(struct seq_file *, struct dentry *);
470 int nfs_show_devname(struct seq_file *, struct dentry *);
471 int nfs_show_path(struct seq_file *, struct dentry *);
472 int nfs_show_stats(struct seq_file *, struct dentry *);
473 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
476 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
477 struct inode *inode, int ioflags, bool force_mds,
478 const struct nfs_pgio_completion_ops *compl_ops);
479 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
480 extern void nfs_commit_free(struct nfs_commit_data *p);
481 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
482 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
483 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
484 struct nfs_commit_data *data,
485 const struct nfs_rpc_ops *nfs_ops,
486 const struct rpc_call_ops *call_ops,
488 extern void nfs_init_commit(struct nfs_commit_data *data,
489 struct list_head *head,
490 struct pnfs_layout_segment *lseg,
491 struct nfs_commit_info *cinfo);
492 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
493 struct nfs_commit_info *cinfo, int max);
494 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
495 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
496 struct nfs_commit_info *cinfo);
497 void nfs_mark_request_commit(struct nfs_page *req,
498 struct pnfs_layout_segment *lseg,
499 struct nfs_commit_info *cinfo,
501 int nfs_write_need_commit(struct nfs_pgio_header *);
502 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
503 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
504 int how, struct nfs_commit_info *cinfo);
505 void nfs_retry_commit(struct list_head *page_list,
506 struct pnfs_layout_segment *lseg,
507 struct nfs_commit_info *cinfo,
509 void nfs_commitdata_release(struct nfs_commit_data *data);
510 void nfs_request_add_commit_list(struct nfs_page *req,
511 struct nfs_commit_info *cinfo);
512 void nfs_request_add_commit_list_locked(struct nfs_page *req,
513 struct list_head *dst,
514 struct nfs_commit_info *cinfo);
515 void nfs_request_remove_commit_list(struct nfs_page *req,
516 struct nfs_commit_info *cinfo);
517 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
519 struct nfs_direct_req *dreq);
520 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
521 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
522 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
524 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
525 loff_t lstart, loff_t lend);
527 #ifdef CONFIG_NFS_V4_1
529 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
533 for (i = 0; i < cinfo->nbuckets; i++)
534 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
538 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
543 #ifdef CONFIG_MIGRATION
544 extern int nfs_migrate_page(struct address_space *,
545 struct page *, struct page *, enum migrate_mode);
549 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
550 const struct nfs_write_verifier *v2)
552 return memcmp(v1->data, v2->data, sizeof(v1->data));
556 extern struct rpc_task *
557 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
558 struct dentry *old_dentry, struct dentry *new_dentry,
559 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
560 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
563 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
564 struct nfs_direct_req *dreq);
565 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
568 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
569 const struct nfs_client_initdata *);
570 extern int nfs40_walk_client_list(struct nfs_client *clp,
571 struct nfs_client **result,
572 const struct cred *cred);
573 extern int nfs41_walk_client_list(struct nfs_client *clp,
574 struct nfs_client **result,
575 const struct cred *cred);
576 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
577 struct rpc_xprt *xprt,
580 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
582 inode = igrab(inode);
583 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
590 static inline void nfs_iput_and_deactive(struct inode *inode)
593 struct super_block *sb = inode->i_sb;
601 * Determine the device name as a string
603 static inline char *nfs_devname(struct dentry *dentry,
604 char *buffer, ssize_t buflen)
607 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
611 * Determine the actual block size (and log2 thereof)
614 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
616 /* make sure blocksize is a power of two */
617 if ((bsize & (bsize - 1)) || nrbitsp) {
618 unsigned char nrbits;
620 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
631 * Calculate the number of 512byte blocks used.
633 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
635 blkcnt_t used = (tsize + 511) >> 9;
636 return (used > ULONG_MAX) ? ULONG_MAX : used;
640 * Compute and set NFS server blocksize
643 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
645 if (bsize < NFS_MIN_FILE_IO_SIZE)
646 bsize = NFS_DEF_FILE_IO_SIZE;
647 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
648 bsize = NFS_MAX_FILE_IO_SIZE;
650 return nfs_block_bits(bsize, nrbitsp);
654 * Determine the maximum file size for a superblock
657 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
659 sb->s_maxbytes = (loff_t)maxfilesize;
660 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
661 sb->s_maxbytes = MAX_LFS_FILESIZE;
665 * Record the page as unstable and mark its inode as dirty.
668 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
671 struct inode *inode = page_file_mapping(page)->host;
673 inc_node_page_state(page, NR_UNSTABLE_NFS);
674 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
675 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
680 * Determine the number of bytes of data the page contains
683 unsigned int nfs_page_length(struct page *page)
685 loff_t i_size = i_size_read(page_file_mapping(page)->host);
688 pgoff_t index = page_index(page);
689 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
690 if (index < end_index)
692 if (index == end_index)
693 return ((i_size - 1) & ~PAGE_MASK) + 1;
699 * Convert a umode to a dirent->d_type
702 unsigned char nfs_umode_to_dtype(umode_t mode)
704 return (mode >> 12) & 15;
708 * Determine the number of pages in an array of length 'len' and
709 * with a base offset of 'base'
712 unsigned int nfs_page_array_len(unsigned int base, size_t len)
714 return ((unsigned long)len + (unsigned long)base +
715 PAGE_SIZE - 1) >> PAGE_SHIFT;
719 * Convert a struct timespec into a 64-bit change attribute
721 * This does approximately the same thing as timespec_to_ns(),
722 * but for calculation efficiency, we multiply the seconds by
726 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
728 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
733 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
734 * @fh - pointer to filehandle
736 * returns a crc32 hash for the filehandle that is compatible with
737 * the one displayed by "wireshark".
739 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
741 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
743 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
745 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
746 NFS4_STATEID_OTHER_SIZE);
749 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
753 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
759 static inline bool nfs_error_is_fatal(int err)
780 static inline bool nfs_error_is_fatal_on_server(int err)
788 return nfs_error_is_fatal(err);
792 * Select between a default port value and a user-specified port value.
793 * If a zero value is set, then autobind will be used.
795 static inline void nfs_set_port(struct sockaddr *sap, int *port,
796 const unsigned short default_port)
798 if (*port == NFS_UNSPEC_PORT)
799 *port = default_port;
801 rpc_set_port(sap, *port);