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 {
85 unsigned int flags; /* NFS{,4}_MOUNT_* flags */
86 unsigned int rsize, wsize;
87 unsigned int timeo, retrans;
88 unsigned int acregmin, acregmax;
89 unsigned int acdirmin, acdirmax;
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;
106 struct sockaddr address;
107 struct sockaddr_storage _address;
113 unsigned short protocol;
118 struct sockaddr address;
119 struct sockaddr_storage _address;
125 unsigned short protocol;
126 unsigned short nconnect;
132 char buf[32]; /* Parse buffer */
136 struct nfs_mount_request {
137 struct sockaddr *sap;
142 unsigned short protocol;
145 unsigned int *auth_flav_len;
146 rpc_authflavor_t *auth_flavs;
150 struct nfs_mount_info {
151 unsigned int inherited_bsize;
152 struct nfs_fs_context *ctx;
153 struct nfs_clone_mount *cloned;
154 struct nfs_server *server;
155 struct nfs_fh *mntfh;
156 struct nfs_subversion *nfs_mod;
159 extern int nfs_mount(struct nfs_mount_request *info);
160 extern void nfs_umount(const struct nfs_mount_request *info);
163 extern const struct rpc_program nfs_program;
164 extern void nfs_clients_init(struct net *net);
165 extern void nfs_clients_exit(struct net *net);
166 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
167 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
168 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
169 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
170 void nfs_server_insert_lists(struct nfs_server *);
171 void nfs_server_remove_lists(struct nfs_server *);
172 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
173 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
175 struct nfs_server *nfs_alloc_server(void);
176 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
178 extern void nfs_put_client(struct nfs_client *);
179 extern void nfs_free_client(struct nfs_client *);
180 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
181 extern struct nfs_client *
182 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
183 struct nfs4_sessionid *, u32);
184 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *);
185 extern struct nfs_server *nfs4_create_server(struct nfs_mount_info *);
186 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
188 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
189 struct sockaddr *sap, size_t salen,
191 extern void nfs_free_server(struct nfs_server *server);
192 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
196 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
197 extern int nfs_client_init_status(const struct nfs_client *clp);
198 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
199 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
200 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
201 const struct sockaddr *ds_addr,
202 int ds_addrlen, int ds_proto,
203 unsigned int ds_timeo,
204 unsigned int ds_retrans,
206 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
208 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
209 const struct sockaddr *ds_addr, int ds_addrlen,
210 int ds_proto, unsigned int ds_timeo,
211 unsigned int ds_retrans);
212 #ifdef CONFIG_PROC_FS
213 extern int __init nfs_fs_proc_init(void);
214 extern void nfs_fs_proc_exit(void);
215 extern int nfs_fs_proc_net_init(struct net *net);
216 extern void nfs_fs_proc_net_exit(struct net *net);
218 static inline int nfs_fs_proc_net_init(struct net *net)
222 static inline void nfs_fs_proc_net_exit(struct net *net)
225 static inline int nfs_fs_proc_init(void)
229 static inline void nfs_fs_proc_exit(void)
235 extern const struct svc_version nfs4_callback_version1;
236 extern const struct svc_version nfs4_callback_version4;
238 struct nfs_pageio_descriptor;
241 #define NFS_TEXT_DATA 1
243 extern struct nfs_fs_context *nfs_alloc_parsed_mount_data(void);
244 extern void nfs_free_parsed_mount_data(struct nfs_fs_context *ctx);
245 extern int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx);
246 extern int nfs_validate_mount_data(struct file_system_type *fs_type,
248 struct nfs_fs_context *ctx,
249 struct nfs_fh *mntfh,
250 const char *dev_name);
251 extern int nfs_validate_text_mount_data(void *options,
252 struct nfs_fs_context *ctx,
253 const char *dev_name);
256 extern int __init nfs_init_nfspagecache(void);
257 extern void nfs_destroy_nfspagecache(void);
258 extern int __init nfs_init_readpagecache(void);
259 extern void nfs_destroy_readpagecache(void);
260 extern int __init nfs_init_writepagecache(void);
261 extern void nfs_destroy_writepagecache(void);
263 extern int __init nfs_init_directcache(void);
264 extern void nfs_destroy_directcache(void);
265 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
266 struct nfs_pgio_header *hdr,
267 void (*release)(struct nfs_pgio_header *hdr));
268 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
269 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
271 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
272 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
273 void nfs_pgio_header_free(struct nfs_pgio_header *);
274 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
275 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
276 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
277 const struct rpc_call_ops *call_ops, int how, int flags);
278 void nfs_free_request(struct nfs_page *req);
279 struct nfs_pgio_mirror *
280 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
282 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
284 WARN_ON_ONCE(desc->pg_mirror_count < 1);
285 return desc->pg_mirror_count > 1;
288 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
289 const struct nfs_open_context *ctx2)
291 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
295 extern const struct rpc_procinfo nfs_procedures[];
296 extern int nfs2_decode_dirent(struct xdr_stream *,
297 struct nfs_entry *, bool);
300 extern const struct rpc_procinfo nfs3_procedures[];
301 extern int nfs3_decode_dirent(struct xdr_stream *,
302 struct nfs_entry *, bool);
305 #if IS_ENABLED(CONFIG_NFS_V4)
306 extern int nfs4_decode_dirent(struct xdr_stream *,
307 struct nfs_entry *, bool);
309 #ifdef CONFIG_NFS_V4_1
310 extern const u32 nfs41_maxread_overhead;
311 extern const u32 nfs41_maxwrite_overhead;
312 extern const u32 nfs41_maxgetdevinfo_overhead;
316 #if IS_ENABLED(CONFIG_NFS_V4)
317 extern const struct rpc_procinfo nfs4_procedures[];
320 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
321 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
322 static inline struct nfs4_label *
323 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
328 if (src->len > NFS4_MAXLABELLEN)
334 memcpy(dst->label, src->label, src->len);
338 static inline void nfs4_label_free(struct nfs4_label *label)
347 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
349 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
350 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
353 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
354 static inline void nfs4_label_free(void *label) {}
355 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
358 static inline struct nfs4_label *
359 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
363 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
366 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
367 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
368 const struct nfs_client_initdata *);
371 extern void nfs_advise_use_readdirplus(struct inode *dir);
372 extern void nfs_force_use_readdirplus(struct inode *dir);
373 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
374 struct shrink_control *sc);
375 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
376 struct shrink_control *sc);
377 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
378 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
379 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
380 int nfs_rmdir(struct inode *, struct dentry *);
381 int nfs_unlink(struct inode *, struct dentry *);
382 int nfs_symlink(struct inode *, struct dentry *, const char *);
383 int nfs_link(struct dentry *, struct inode *, struct dentry *);
384 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
385 int nfs_rename(struct inode *, struct dentry *,
386 struct inode *, struct dentry *, unsigned int);
389 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
390 loff_t nfs_file_llseek(struct file *, loff_t, int);
391 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
392 int nfs_file_mmap(struct file *, struct vm_area_struct *);
393 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
394 int nfs_file_release(struct inode *, struct file *);
395 int nfs_lock(struct file *, int, struct file_lock *);
396 int nfs_flock(struct file *, int, struct file_lock *);
397 int nfs_check_flags(int);
400 extern struct workqueue_struct *nfsiod_workqueue;
401 extern struct inode *nfs_alloc_inode(struct super_block *sb);
402 extern void nfs_free_inode(struct inode *);
403 extern int nfs_write_inode(struct inode *, struct writeback_control *);
404 extern int nfs_drop_inode(struct inode *);
405 extern void nfs_clear_inode(struct inode *);
406 extern void nfs_evict_inode(struct inode *);
407 void nfs_zap_acl_cache(struct inode *inode);
408 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
409 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
410 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
413 extern const struct super_operations nfs_sops;
414 extern struct file_system_type nfs_fs_type;
415 extern struct file_system_type nfs_prepared_fs_type;
416 #if IS_ENABLED(CONFIG_NFS_V4)
417 extern struct file_system_type nfs4_referral_fs_type;
419 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
420 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *);
421 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
422 void nfs_kill_super(struct super_block *);
424 extern struct rpc_stat nfs_rpcstat;
426 extern int __init register_nfs_fs(void);
427 extern void __exit unregister_nfs_fs(void);
428 extern bool nfs_sb_active(struct super_block *sb);
429 extern void nfs_sb_deactive(struct super_block *sb);
432 extern void nfs_start_io_read(struct inode *inode);
433 extern void nfs_end_io_read(struct inode *inode);
434 extern void nfs_start_io_write(struct inode *inode);
435 extern void nfs_end_io_write(struct inode *inode);
436 extern void nfs_start_io_direct(struct inode *inode);
437 extern void nfs_end_io_direct(struct inode *inode);
439 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
441 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
445 #define NFS_PATH_CANONICAL 1
446 extern char *nfs_path(char **p, struct dentry *dentry,
447 char *buffer, ssize_t buflen, unsigned flags);
448 extern struct vfsmount *nfs_d_automount(struct path *path);
449 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
450 struct nfs_fh *, struct nfs_fattr *);
451 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
452 struct nfs_fattr *, rpc_authflavor_t);
455 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
457 #if IS_ENABLED(CONFIG_NFS_V4)
458 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
461 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
464 struct nfs_pgio_completion_ops;
466 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
467 struct inode *inode, bool force_mds,
468 const struct nfs_pgio_completion_ops *compl_ops);
469 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
470 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
473 void nfs_umount_begin(struct super_block *);
474 int nfs_statfs(struct dentry *, struct kstatfs *);
475 int nfs_show_options(struct seq_file *, struct dentry *);
476 int nfs_show_devname(struct seq_file *, struct dentry *);
477 int nfs_show_path(struct seq_file *, struct dentry *);
478 int nfs_show_stats(struct seq_file *, struct dentry *);
479 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
482 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
483 struct inode *inode, int ioflags, bool force_mds,
484 const struct nfs_pgio_completion_ops *compl_ops);
485 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
486 extern void nfs_commit_free(struct nfs_commit_data *p);
487 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
488 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
489 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
490 struct nfs_commit_data *data,
491 const struct nfs_rpc_ops *nfs_ops,
492 const struct rpc_call_ops *call_ops,
494 extern void nfs_init_commit(struct nfs_commit_data *data,
495 struct list_head *head,
496 struct pnfs_layout_segment *lseg,
497 struct nfs_commit_info *cinfo);
498 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
499 struct nfs_commit_info *cinfo, int max);
500 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
501 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
502 struct nfs_commit_info *cinfo);
503 void nfs_mark_request_commit(struct nfs_page *req,
504 struct pnfs_layout_segment *lseg,
505 struct nfs_commit_info *cinfo,
507 int nfs_write_need_commit(struct nfs_pgio_header *);
508 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
509 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
510 int how, struct nfs_commit_info *cinfo);
511 void nfs_retry_commit(struct list_head *page_list,
512 struct pnfs_layout_segment *lseg,
513 struct nfs_commit_info *cinfo,
515 void nfs_commitdata_release(struct nfs_commit_data *data);
516 void nfs_request_add_commit_list(struct nfs_page *req,
517 struct nfs_commit_info *cinfo);
518 void nfs_request_add_commit_list_locked(struct nfs_page *req,
519 struct list_head *dst,
520 struct nfs_commit_info *cinfo);
521 void nfs_request_remove_commit_list(struct nfs_page *req,
522 struct nfs_commit_info *cinfo);
523 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
525 struct nfs_direct_req *dreq);
526 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
527 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
528 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
530 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
531 loff_t lstart, loff_t lend);
533 #ifdef CONFIG_NFS_V4_1
535 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
539 for (i = 0; i < cinfo->nbuckets; i++)
540 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
544 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
549 #ifdef CONFIG_MIGRATION
550 extern int nfs_migrate_page(struct address_space *,
551 struct page *, struct page *, enum migrate_mode);
555 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
556 const struct nfs_write_verifier *v2)
558 return memcmp(v1->data, v2->data, sizeof(v1->data));
562 extern struct rpc_task *
563 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
564 struct dentry *old_dentry, struct dentry *new_dentry,
565 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
566 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
569 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
570 struct nfs_direct_req *dreq);
571 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
574 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
575 const struct nfs_client_initdata *);
576 extern int nfs40_walk_client_list(struct nfs_client *clp,
577 struct nfs_client **result,
578 const struct cred *cred);
579 extern int nfs41_walk_client_list(struct nfs_client *clp,
580 struct nfs_client **result,
581 const struct cred *cred);
582 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
583 struct rpc_xprt *xprt,
586 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
588 inode = igrab(inode);
589 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
596 static inline void nfs_iput_and_deactive(struct inode *inode)
599 struct super_block *sb = inode->i_sb;
607 * Determine the device name as a string
609 static inline char *nfs_devname(struct dentry *dentry,
610 char *buffer, ssize_t buflen)
613 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
617 * Determine the actual block size (and log2 thereof)
620 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
622 /* make sure blocksize is a power of two */
623 if ((bsize & (bsize - 1)) || nrbitsp) {
624 unsigned char nrbits;
626 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
637 * Calculate the number of 512byte blocks used.
639 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
641 blkcnt_t used = (tsize + 511) >> 9;
642 return (used > ULONG_MAX) ? ULONG_MAX : used;
646 * Compute and set NFS server blocksize
649 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
651 if (bsize < NFS_MIN_FILE_IO_SIZE)
652 bsize = NFS_DEF_FILE_IO_SIZE;
653 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
654 bsize = NFS_MAX_FILE_IO_SIZE;
656 return nfs_block_bits(bsize, nrbitsp);
660 * Determine the maximum file size for a superblock
663 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
665 sb->s_maxbytes = (loff_t)maxfilesize;
666 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
667 sb->s_maxbytes = MAX_LFS_FILESIZE;
671 * Record the page as unstable and mark its inode as dirty.
674 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
677 struct inode *inode = page_file_mapping(page)->host;
679 inc_node_page_state(page, NR_UNSTABLE_NFS);
680 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
681 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
686 * Determine the number of bytes of data the page contains
689 unsigned int nfs_page_length(struct page *page)
691 loff_t i_size = i_size_read(page_file_mapping(page)->host);
694 pgoff_t index = page_index(page);
695 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
696 if (index < end_index)
698 if (index == end_index)
699 return ((i_size - 1) & ~PAGE_MASK) + 1;
705 * Convert a umode to a dirent->d_type
708 unsigned char nfs_umode_to_dtype(umode_t mode)
710 return (mode >> 12) & 15;
714 * Determine the number of pages in an array of length 'len' and
715 * with a base offset of 'base'
718 unsigned int nfs_page_array_len(unsigned int base, size_t len)
720 return ((unsigned long)len + (unsigned long)base +
721 PAGE_SIZE - 1) >> PAGE_SHIFT;
725 * Convert a struct timespec into a 64-bit change attribute
727 * This does approximately the same thing as timespec_to_ns(),
728 * but for calculation efficiency, we multiply the seconds by
732 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
734 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
739 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
740 * @fh - pointer to filehandle
742 * returns a crc32 hash for the filehandle that is compatible with
743 * the one displayed by "wireshark".
745 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
747 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
749 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
751 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
752 NFS4_STATEID_OTHER_SIZE);
755 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
759 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
765 static inline bool nfs_error_is_fatal(int err)
786 static inline bool nfs_error_is_fatal_on_server(int err)
794 return nfs_error_is_fatal(err);
798 * Select between a default port value and a user-specified port value.
799 * If a zero value is set, then autobind will be used.
801 static inline void nfs_set_port(struct sockaddr *sap, int *port,
802 const unsigned short default_port)
804 if (*port == NFS_UNSPEC_PORT)
805 *port = default_port;
807 rpc_set_port(sap, *port);