1 /* SPDX-License-Identifier: GPL-2.0 */
3 * NFS internal definitions
7 #include <linux/fs_context.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_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
16 extern const struct export_operations nfs_export_ops;
19 struct nfs_pageio_descriptor;
21 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
23 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
24 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
27 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
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)))
36 static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry)
38 if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL))
40 if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size)
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 bool skip_reconfig_option_check;
89 unsigned int flags; /* NFS{,4}_MOUNT_* flags */
90 unsigned int rsize, wsize;
91 unsigned int timeo, retrans;
92 unsigned int acregmin, acregmax;
93 unsigned int acdirmin, acdirmax;
97 struct nfs_auth_info auth_info;
98 rpc_authflavor_t selected_flavor;
100 unsigned int version;
101 unsigned int minorversion;
103 unsigned short protofamily;
104 unsigned short mountfamily;
108 struct sockaddr address;
109 struct sockaddr_storage _address;
115 unsigned short protocol;
120 struct sockaddr address;
121 struct sockaddr_storage _address;
127 unsigned short protocol;
128 unsigned short nconnect;
129 unsigned short export_path_len;
132 struct nfs_fh *mntfh;
133 struct nfs_server *server;
134 struct nfs_subversion *nfs_mod;
136 /* Information for a cloned mount. */
137 struct nfs_clone_mount {
138 struct super_block *sb;
139 struct dentry *dentry;
140 struct nfs_fattr *fattr;
141 unsigned int inherited_bsize;
145 #define nfs_errorf(fc, fmt, ...) errorf(fc, fmt, ## __VA_ARGS__)
146 #define nfs_invalf(fc, fmt, ...) invalf(fc, fmt, ## __VA_ARGS__)
147 #define nfs_warnf(fc, fmt, ...) warnf(fc, fmt, ## __VA_ARGS__)
149 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
151 return fc->fs_private;
155 struct nfs_mount_request {
156 struct sockaddr *sap;
161 unsigned short protocol;
164 unsigned int *auth_flav_len;
165 rpc_authflavor_t *auth_flavs;
169 extern int nfs_mount(struct nfs_mount_request *info);
170 extern void nfs_umount(const struct nfs_mount_request *info);
173 extern const struct rpc_program nfs_program;
174 extern void nfs_clients_init(struct net *net);
175 extern void nfs_clients_exit(struct net *net);
176 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
177 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
178 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
179 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
180 void nfs_server_insert_lists(struct nfs_server *);
181 void nfs_server_remove_lists(struct nfs_server *);
182 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
183 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
185 struct nfs_server *nfs_alloc_server(void);
186 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
188 extern void nfs_put_client(struct nfs_client *);
189 extern void nfs_free_client(struct nfs_client *);
190 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
191 extern struct nfs_client *
192 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
193 struct nfs4_sessionid *, u32);
194 extern struct nfs_server *nfs_create_server(struct fs_context *);
195 extern struct nfs_server *nfs4_create_server(struct fs_context *);
196 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
197 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
198 struct sockaddr *sap, size_t salen,
200 extern void nfs_free_server(struct nfs_server *server);
201 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
205 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
206 extern int nfs_client_init_status(const struct nfs_client *clp);
207 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
208 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
209 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
210 const struct sockaddr *ds_addr,
211 int ds_addrlen, int ds_proto,
212 unsigned int ds_timeo,
213 unsigned int ds_retrans,
215 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
217 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
218 const struct sockaddr *ds_addr, int ds_addrlen,
219 int ds_proto, unsigned int ds_timeo,
220 unsigned int ds_retrans);
221 #ifdef CONFIG_PROC_FS
222 extern int __init nfs_fs_proc_init(void);
223 extern void nfs_fs_proc_exit(void);
224 extern int nfs_fs_proc_net_init(struct net *net);
225 extern void nfs_fs_proc_net_exit(struct net *net);
227 static inline int nfs_fs_proc_net_init(struct net *net)
231 static inline void nfs_fs_proc_net_exit(struct net *net)
234 static inline int nfs_fs_proc_init(void)
238 static inline void nfs_fs_proc_exit(void)
244 extern const struct svc_version nfs4_callback_version1;
245 extern const struct svc_version nfs4_callback_version4;
248 extern struct file_system_type nfs_fs_type;
251 extern int __init nfs_init_nfspagecache(void);
252 extern void nfs_destroy_nfspagecache(void);
253 extern int __init nfs_init_readpagecache(void);
254 extern void nfs_destroy_readpagecache(void);
255 extern int __init nfs_init_writepagecache(void);
256 extern void nfs_destroy_writepagecache(void);
258 extern int __init nfs_init_directcache(void);
259 extern void nfs_destroy_directcache(void);
260 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
261 struct nfs_pgio_header *hdr,
262 void (*release)(struct nfs_pgio_header *hdr));
263 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
264 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
266 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
267 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
268 void nfs_pgio_header_free(struct nfs_pgio_header *);
269 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
270 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
271 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
272 const struct rpc_call_ops *call_ops, int how, int flags);
273 void nfs_free_request(struct nfs_page *req);
274 struct nfs_pgio_mirror *
275 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
277 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
278 const struct nfs_open_context *ctx2)
280 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
284 extern const struct rpc_procinfo nfs_procedures[];
285 extern int nfs2_decode_dirent(struct xdr_stream *,
286 struct nfs_entry *, bool);
289 extern const struct rpc_procinfo nfs3_procedures[];
290 extern int nfs3_decode_dirent(struct xdr_stream *,
291 struct nfs_entry *, bool);
294 #if IS_ENABLED(CONFIG_NFS_V4)
295 extern int nfs4_decode_dirent(struct xdr_stream *,
296 struct nfs_entry *, bool);
298 #ifdef CONFIG_NFS_V4_1
299 extern const u32 nfs41_maxread_overhead;
300 extern const u32 nfs41_maxwrite_overhead;
301 extern const u32 nfs41_maxgetdevinfo_overhead;
305 #if IS_ENABLED(CONFIG_NFS_V4)
306 extern const struct rpc_procinfo nfs4_procedures[];
309 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
310 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
311 static inline struct nfs4_label *
312 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
317 if (src->len > NFS4_MAXLABELLEN)
323 memcpy(dst->label, src->label, src->len);
327 static inline void nfs4_label_free(struct nfs4_label *label)
336 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
338 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
339 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
342 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
343 static inline void nfs4_label_free(void *label) {}
344 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
347 static inline struct nfs4_label *
348 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
352 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
355 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
356 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
357 const struct nfs_client_initdata *);
360 extern void nfs_advise_use_readdirplus(struct inode *dir);
361 extern void nfs_force_use_readdirplus(struct inode *dir);
362 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
363 struct shrink_control *sc);
364 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
365 struct shrink_control *sc);
366 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
367 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
368 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
369 int nfs_rmdir(struct inode *, struct dentry *);
370 int nfs_unlink(struct inode *, struct dentry *);
371 int nfs_symlink(struct inode *, struct dentry *, const char *);
372 int nfs_link(struct dentry *, struct inode *, struct dentry *);
373 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
374 int nfs_rename(struct inode *, struct dentry *,
375 struct inode *, struct dentry *, unsigned int);
378 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
379 loff_t nfs_file_llseek(struct file *, loff_t, int);
380 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
381 int nfs_file_mmap(struct file *, struct vm_area_struct *);
382 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
383 int nfs_file_release(struct inode *, struct file *);
384 int nfs_lock(struct file *, int, struct file_lock *);
385 int nfs_flock(struct file *, int, struct file_lock *);
386 int nfs_check_flags(int);
389 extern struct workqueue_struct *nfsiod_workqueue;
390 extern struct inode *nfs_alloc_inode(struct super_block *sb);
391 extern void nfs_free_inode(struct inode *);
392 extern int nfs_write_inode(struct inode *, struct writeback_control *);
393 extern int nfs_drop_inode(struct inode *);
394 extern void nfs_clear_inode(struct inode *);
395 extern void nfs_evict_inode(struct inode *);
396 void nfs_zap_acl_cache(struct inode *inode);
397 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
398 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
399 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
402 extern const struct super_operations nfs_sops;
403 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
404 int nfs_try_get_tree(struct fs_context *);
405 int nfs_get_tree_common(struct fs_context *);
406 void nfs_kill_super(struct super_block *);
408 extern struct rpc_stat nfs_rpcstat;
410 extern int __init register_nfs_fs(void);
411 extern void __exit unregister_nfs_fs(void);
412 extern bool nfs_sb_active(struct super_block *sb);
413 extern void nfs_sb_deactive(struct super_block *sb);
414 extern int nfs_client_for_each_server(struct nfs_client *clp,
415 int (*fn)(struct nfs_server *, void *),
418 extern void nfs_start_io_read(struct inode *inode);
419 extern void nfs_end_io_read(struct inode *inode);
420 extern void nfs_start_io_write(struct inode *inode);
421 extern void nfs_end_io_write(struct inode *inode);
422 extern void nfs_start_io_direct(struct inode *inode);
423 extern void nfs_end_io_direct(struct inode *inode);
425 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
427 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
431 #define NFS_PATH_CANONICAL 1
432 extern char *nfs_path(char **p, struct dentry *dentry,
433 char *buffer, ssize_t buflen, unsigned flags);
434 extern struct vfsmount *nfs_d_automount(struct path *path);
435 int nfs_submount(struct fs_context *, struct nfs_server *);
436 int nfs_do_submount(struct fs_context *);
439 extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
440 #if IS_ENABLED(CONFIG_NFS_V4)
441 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
444 struct nfs_pgio_completion_ops;
446 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
447 struct inode *inode, bool force_mds,
448 const struct nfs_pgio_completion_ops *compl_ops);
449 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
450 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
453 void nfs_umount_begin(struct super_block *);
454 int nfs_statfs(struct dentry *, struct kstatfs *);
455 int nfs_show_options(struct seq_file *, struct dentry *);
456 int nfs_show_devname(struct seq_file *, struct dentry *);
457 int nfs_show_path(struct seq_file *, struct dentry *);
458 int nfs_show_stats(struct seq_file *, struct dentry *);
459 int nfs_reconfigure(struct fs_context *);
462 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
463 struct inode *inode, int ioflags, bool force_mds,
464 const struct nfs_pgio_completion_ops *compl_ops);
465 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
466 extern void nfs_commit_free(struct nfs_commit_data *p);
467 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
468 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
469 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
470 struct nfs_commit_data *data,
471 const struct nfs_rpc_ops *nfs_ops,
472 const struct rpc_call_ops *call_ops,
474 extern void nfs_init_commit(struct nfs_commit_data *data,
475 struct list_head *head,
476 struct pnfs_layout_segment *lseg,
477 struct nfs_commit_info *cinfo);
478 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
479 struct nfs_commit_info *cinfo, int max);
480 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
481 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
482 struct nfs_commit_info *cinfo);
483 void nfs_mark_request_commit(struct nfs_page *req,
484 struct pnfs_layout_segment *lseg,
485 struct nfs_commit_info *cinfo,
487 int nfs_write_need_commit(struct nfs_pgio_header *);
488 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
489 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
490 int how, struct nfs_commit_info *cinfo);
491 void nfs_retry_commit(struct list_head *page_list,
492 struct pnfs_layout_segment *lseg,
493 struct nfs_commit_info *cinfo,
495 void nfs_commitdata_release(struct nfs_commit_data *data);
496 void nfs_request_add_commit_list(struct nfs_page *req,
497 struct nfs_commit_info *cinfo);
498 void nfs_request_add_commit_list_locked(struct nfs_page *req,
499 struct list_head *dst,
500 struct nfs_commit_info *cinfo);
501 void nfs_request_remove_commit_list(struct nfs_page *req,
502 struct nfs_commit_info *cinfo);
503 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
505 struct nfs_direct_req *dreq);
506 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
507 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
508 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
510 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
511 loff_t lstart, loff_t lend);
513 #ifdef CONFIG_NFS_V4_1
515 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
516 unsigned int nbuckets)
520 for (i = 0; i < nbuckets; i++)
521 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
524 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
526 struct pnfs_commit_array *array;
529 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
530 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
536 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
541 #ifdef CONFIG_MIGRATION
542 extern int nfs_migrate_page(struct address_space *,
543 struct page *, struct page *, enum migrate_mode);
547 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
548 const struct nfs_write_verifier *v2)
550 return memcmp(v1->data, v2->data, sizeof(v1->data));
554 nfs_write_match_verf(const struct nfs_writeverf *verf,
555 struct nfs_page *req)
557 return verf->committed > NFS_UNSTABLE &&
558 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
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 (an extra writeback period) and mark its
675 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
678 struct inode *inode = page_file_mapping(page)->host;
680 /* This page is really still in write-back - just that the
681 * writeback is happening on the server now.
683 inc_node_page_state(page, NR_WRITEBACK);
684 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
685 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
690 * Determine the number of bytes of data the page contains
693 unsigned int nfs_page_length(struct page *page)
695 loff_t i_size = i_size_read(page_file_mapping(page)->host);
698 pgoff_t index = page_index(page);
699 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
700 if (index < end_index)
702 if (index == end_index)
703 return ((i_size - 1) & ~PAGE_MASK) + 1;
709 * Convert a umode to a dirent->d_type
712 unsigned char nfs_umode_to_dtype(umode_t mode)
714 return (mode >> 12) & 15;
718 * Determine the number of pages in an array of length 'len' and
719 * with a base offset of 'base'
722 unsigned int nfs_page_array_len(unsigned int base, size_t len)
724 return ((unsigned long)len + (unsigned long)base +
725 PAGE_SIZE - 1) >> PAGE_SHIFT;
729 * Convert a struct timespec64 into a 64-bit change attribute
731 * This does approximately the same thing as timespec64_to_ns(),
732 * but for calculation efficiency, we multiply the seconds by
736 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
738 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
743 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
744 * @fh - pointer to filehandle
746 * returns a crc32 hash for the filehandle that is compatible with
747 * the one displayed by "wireshark".
749 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
751 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
753 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
755 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
756 NFS4_STATEID_OTHER_SIZE);
759 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
763 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
769 static inline bool nfs_error_is_fatal(int err)
790 static inline bool nfs_error_is_fatal_on_server(int err)
798 return nfs_error_is_fatal(err);
802 * Select between a default port value and a user-specified port value.
803 * If a zero value is set, then autobind will be used.
805 static inline void nfs_set_port(struct sockaddr *sap, int *port,
806 const unsigned short default_port)
808 if (*port == NFS_UNSPEC_PORT)
809 *port = default_port;
811 rpc_set_port(sap, *port);