2 * NFS internal definitions
6 #include <linux/mount.h>
7 #include <linux/security.h>
8 #include <linux/crc32.h>
9 #include <linux/nfs_page.h>
11 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
15 /* Maximum number of readahead requests
16 * FIXME: this should really be a sysctl so that users may tune it to suit
17 * their needs. People that do NFS over a slow network, might for
18 * instance want to reduce it to something closer to 1 for improved
19 * interactive response.
21 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
23 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
25 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
26 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
29 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
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)))
38 struct nfs_clone_mount {
39 const struct super_block *sb;
40 const struct dentry *dentry;
42 struct nfs_fattr *fattr;
45 struct sockaddr *addr;
47 rpc_authflavor_t authflavor;
51 * Note: RFC 1813 doesn't limit the number of auth flavors that
52 * a server can return, so make something up.
54 #define NFS_MAX_SECFLAVORS (12)
57 * Value used if the user did not specify a port value.
59 #define NFS_UNSPEC_PORT (-1)
61 #define NFS_UNSPEC_RETRANS (UINT_MAX)
62 #define NFS_UNSPEC_TIMEO (UINT_MAX)
65 * Maximum number of pages that readdir can use for creating
66 * a vmapped array of pages.
68 #define NFS_MAX_READDIR_PAGES 8
70 struct nfs_client_initdata {
71 unsigned long init_flags;
72 const char *hostname; /* Hostname of the server */
73 const struct sockaddr *addr; /* Address of the server */
74 const char *nodename; /* Hostname of the client */
75 const char *ip_addr; /* IP address of the client */
77 struct nfs_subversion *nfs_mod;
81 const struct rpc_timeout *timeparms;
85 * In-kernel mount arguments
87 struct nfs_parsed_mount_data {
89 unsigned int rsize, wsize;
90 unsigned int timeo, retrans;
91 unsigned int acregmin, acregmax,
96 struct nfs_auth_info auth_info;
97 rpc_authflavor_t selected_flavor;
100 unsigned int minorversion;
105 struct sockaddr_storage address;
110 unsigned short protocol;
114 struct sockaddr_storage address;
119 unsigned short protocol;
122 struct security_mnt_opts lsm_opts;
127 struct nfs_mount_request {
128 struct sockaddr *sap;
133 unsigned short protocol;
136 unsigned int *auth_flav_len;
137 rpc_authflavor_t *auth_flavs;
141 struct nfs_mount_info {
142 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
143 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
144 struct nfs_parsed_mount_data *parsed;
145 struct nfs_clone_mount *cloned;
146 struct nfs_fh *mntfh;
149 extern int nfs_mount(struct nfs_mount_request *info);
150 extern void nfs_umount(const struct nfs_mount_request *info);
153 extern const struct rpc_program nfs_program;
154 extern void nfs_clients_init(struct net *net);
155 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
156 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
157 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
158 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
159 void nfs_server_insert_lists(struct nfs_server *);
160 void nfs_server_remove_lists(struct nfs_server *);
161 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
162 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
164 struct nfs_server *nfs_alloc_server(void);
165 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
167 extern void nfs_cleanup_cb_ident_idr(struct net *);
168 extern void nfs_put_client(struct nfs_client *);
169 extern void nfs_free_client(struct nfs_client *);
170 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
171 extern struct nfs_client *
172 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
173 struct nfs4_sessionid *, u32);
174 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
175 struct nfs_subversion *);
176 extern struct nfs_server *nfs4_create_server(
177 struct nfs_mount_info *,
178 struct nfs_subversion *);
179 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
181 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
182 struct sockaddr *sap, size_t salen,
184 extern void nfs_free_server(struct nfs_server *server);
185 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
189 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
190 extern int nfs_client_init_status(const struct nfs_client *clp);
191 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
192 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
193 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
194 const struct sockaddr *ds_addr,
195 int ds_addrlen, int ds_proto,
196 unsigned int ds_timeo,
197 unsigned int ds_retrans,
199 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
201 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
202 const struct sockaddr *ds_addr, int ds_addrlen,
203 int ds_proto, unsigned int ds_timeo,
204 unsigned int ds_retrans);
205 #ifdef CONFIG_PROC_FS
206 extern int __init nfs_fs_proc_init(void);
207 extern void nfs_fs_proc_exit(void);
208 extern int nfs_fs_proc_net_init(struct net *net);
209 extern void nfs_fs_proc_net_exit(struct net *net);
211 static inline int nfs_fs_proc_net_init(struct net *net)
215 static inline void nfs_fs_proc_net_exit(struct net *net)
218 static inline int nfs_fs_proc_init(void)
222 static inline void nfs_fs_proc_exit(void)
228 extern const struct svc_version nfs4_callback_version1;
229 extern const struct svc_version nfs4_callback_version4;
231 struct nfs_pageio_descriptor;
233 extern int __init nfs_init_nfspagecache(void);
234 extern void nfs_destroy_nfspagecache(void);
235 extern int __init nfs_init_readpagecache(void);
236 extern void nfs_destroy_readpagecache(void);
237 extern int __init nfs_init_writepagecache(void);
238 extern void nfs_destroy_writepagecache(void);
240 extern int __init nfs_init_directcache(void);
241 extern void nfs_destroy_directcache(void);
242 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
243 struct nfs_pgio_header *hdr,
244 void (*release)(struct nfs_pgio_header *hdr));
245 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
246 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
248 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
249 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
250 void nfs_pgio_header_free(struct nfs_pgio_header *);
251 void nfs_pgio_data_destroy(struct nfs_pgio_header *);
252 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
253 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
254 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
255 const struct rpc_call_ops *call_ops, int how, int flags);
256 void nfs_free_request(struct nfs_page *req);
257 struct nfs_pgio_mirror *
258 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
260 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
262 WARN_ON_ONCE(desc->pg_mirror_count < 1);
263 return desc->pg_mirror_count > 1;
266 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
267 const struct nfs_open_context *ctx2)
269 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
273 extern const struct rpc_procinfo nfs_procedures[];
274 extern int nfs2_decode_dirent(struct xdr_stream *,
275 struct nfs_entry *, int);
278 extern const struct rpc_procinfo nfs3_procedures[];
279 extern int nfs3_decode_dirent(struct xdr_stream *,
280 struct nfs_entry *, int);
283 #if IS_ENABLED(CONFIG_NFS_V4)
284 extern int nfs4_decode_dirent(struct xdr_stream *,
285 struct nfs_entry *, int);
287 #ifdef CONFIG_NFS_V4_1
288 extern const u32 nfs41_maxread_overhead;
289 extern const u32 nfs41_maxwrite_overhead;
290 extern const u32 nfs41_maxgetdevinfo_overhead;
294 #if IS_ENABLED(CONFIG_NFS_V4)
295 extern const struct rpc_procinfo nfs4_procedures[];
298 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
299 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
300 static inline struct nfs4_label *
301 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
306 if (src->len > NFS4_MAXLABELLEN)
312 memcpy(dst->label, src->label, src->len);
316 static inline void nfs4_label_free(struct nfs4_label *label)
325 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
327 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
328 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
331 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
332 static inline void nfs4_label_free(void *label) {}
333 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
336 static inline struct nfs4_label *
337 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
341 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
344 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
345 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
346 const struct nfs_client_initdata *);
349 extern void nfs_advise_use_readdirplus(struct inode *dir);
350 extern void nfs_force_use_readdirplus(struct inode *dir);
351 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
352 struct shrink_control *sc);
353 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
354 struct shrink_control *sc);
355 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
356 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
357 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
358 int nfs_rmdir(struct inode *, struct dentry *);
359 int nfs_unlink(struct inode *, struct dentry *);
360 int nfs_symlink(struct inode *, struct dentry *, const char *);
361 int nfs_link(struct dentry *, struct inode *, struct dentry *);
362 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
363 int nfs_rename(struct inode *, struct dentry *,
364 struct inode *, struct dentry *, unsigned int);
367 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
368 loff_t nfs_file_llseek(struct file *, loff_t, int);
369 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
370 int nfs_file_mmap(struct file *, struct vm_area_struct *);
371 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
372 int nfs_file_release(struct inode *, struct file *);
373 int nfs_lock(struct file *, int, struct file_lock *);
374 int nfs_flock(struct file *, int, struct file_lock *);
375 int nfs_check_flags(int);
378 extern struct workqueue_struct *nfsiod_workqueue;
379 extern struct inode *nfs_alloc_inode(struct super_block *sb);
380 extern void nfs_destroy_inode(struct inode *);
381 extern int nfs_write_inode(struct inode *, struct writeback_control *);
382 extern int nfs_drop_inode(struct inode *);
383 extern void nfs_clear_inode(struct inode *);
384 extern void nfs_evict_inode(struct inode *);
385 void nfs_zap_acl_cache(struct inode *inode);
386 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
387 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
388 extern int nfs_wait_atomic_killable(atomic_t *p);
391 extern const struct super_operations nfs_sops;
392 extern struct file_system_type nfs_fs_type;
393 extern struct file_system_type nfs_xdev_fs_type;
394 #if IS_ENABLED(CONFIG_NFS_V4)
395 extern struct file_system_type nfs4_xdev_fs_type;
396 extern struct file_system_type nfs4_referral_fs_type;
398 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
399 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
400 struct nfs_subversion *);
401 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
402 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
403 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
404 struct nfs_mount_info *, struct nfs_subversion *);
405 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
406 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
407 const char *, struct nfs_mount_info *);
408 void nfs_kill_super(struct super_block *);
409 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
411 extern struct rpc_stat nfs_rpcstat;
413 extern int __init register_nfs_fs(void);
414 extern void __exit unregister_nfs_fs(void);
415 extern bool nfs_sb_active(struct super_block *sb);
416 extern void nfs_sb_deactive(struct super_block *sb);
419 extern void nfs_start_io_read(struct inode *inode);
420 extern void nfs_end_io_read(struct inode *inode);
421 extern void nfs_start_io_write(struct inode *inode);
422 extern void nfs_end_io_write(struct inode *inode);
423 extern void nfs_start_io_direct(struct inode *inode);
424 extern void nfs_end_io_direct(struct inode *inode);
426 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
428 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
432 #define NFS_PATH_CANONICAL 1
433 extern char *nfs_path(char **p, struct dentry *dentry,
434 char *buffer, ssize_t buflen, unsigned flags);
435 extern struct vfsmount *nfs_d_automount(struct path *path);
436 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
437 struct nfs_fh *, struct nfs_fattr *);
438 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
439 struct nfs_fattr *, rpc_authflavor_t);
442 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
444 #if IS_ENABLED(CONFIG_NFS_V4)
445 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
448 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
451 struct nfs_pgio_completion_ops;
453 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
454 struct inode *inode, bool force_mds,
455 const struct nfs_pgio_completion_ops *compl_ops);
456 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
457 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
460 void nfs_umount_begin(struct super_block *);
461 int nfs_statfs(struct dentry *, struct kstatfs *);
462 int nfs_show_options(struct seq_file *, struct dentry *);
463 int nfs_show_devname(struct seq_file *, struct dentry *);
464 int nfs_show_path(struct seq_file *, struct dentry *);
465 int nfs_show_stats(struct seq_file *, struct dentry *);
466 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
469 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
470 struct inode *inode, int ioflags, bool force_mds,
471 const struct nfs_pgio_completion_ops *compl_ops);
472 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
473 extern void nfs_commit_free(struct nfs_commit_data *p);
474 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
475 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
476 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
477 struct nfs_commit_data *data,
478 const struct nfs_rpc_ops *nfs_ops,
479 const struct rpc_call_ops *call_ops,
481 extern void nfs_init_commit(struct nfs_commit_data *data,
482 struct list_head *head,
483 struct pnfs_layout_segment *lseg,
484 struct nfs_commit_info *cinfo);
485 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
486 struct nfs_commit_info *cinfo, int max);
487 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
488 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
489 struct nfs_commit_info *cinfo);
490 void nfs_mark_request_commit(struct nfs_page *req,
491 struct pnfs_layout_segment *lseg,
492 struct nfs_commit_info *cinfo,
494 int nfs_write_need_commit(struct nfs_pgio_header *);
495 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
496 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
497 int how, struct nfs_commit_info *cinfo);
498 void nfs_retry_commit(struct list_head *page_list,
499 struct pnfs_layout_segment *lseg,
500 struct nfs_commit_info *cinfo,
502 void nfs_commitdata_release(struct nfs_commit_data *data);
503 void nfs_request_add_commit_list(struct nfs_page *req,
504 struct nfs_commit_info *cinfo);
505 void nfs_request_add_commit_list_locked(struct nfs_page *req,
506 struct list_head *dst,
507 struct nfs_commit_info *cinfo);
508 void nfs_request_remove_commit_list(struct nfs_page *req,
509 struct nfs_commit_info *cinfo);
510 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
512 struct nfs_direct_req *dreq);
513 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
514 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
515 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
517 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
518 loff_t lstart, loff_t lend);
520 #ifdef CONFIG_NFS_V4_1
522 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
526 for (i = 0; i < cinfo->nbuckets; i++)
527 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
531 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
536 #ifdef CONFIG_MIGRATION
537 extern int nfs_migrate_page(struct address_space *,
538 struct page *, struct page *, enum migrate_mode);
542 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
543 const struct nfs_write_verifier *v2)
545 return memcmp(v1->data, v2->data, sizeof(v1->data));
549 extern struct rpc_task *
550 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
551 struct dentry *old_dentry, struct dentry *new_dentry,
552 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
553 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
556 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
557 struct nfs_direct_req *dreq);
558 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
561 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
562 const struct nfs_client_initdata *);
563 extern int nfs40_walk_client_list(struct nfs_client *clp,
564 struct nfs_client **result,
565 struct rpc_cred *cred);
566 extern int nfs41_walk_client_list(struct nfs_client *clp,
567 struct nfs_client **result,
568 struct rpc_cred *cred);
569 extern int nfs4_test_session_trunk(struct rpc_clnt *,
573 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
575 inode = igrab(inode);
576 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
583 static inline void nfs_iput_and_deactive(struct inode *inode)
586 struct super_block *sb = inode->i_sb;
594 * Determine the device name as a string
596 static inline char *nfs_devname(struct dentry *dentry,
597 char *buffer, ssize_t buflen)
600 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
604 * Determine the actual block size (and log2 thereof)
607 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
609 /* make sure blocksize is a power of two */
610 if ((bsize & (bsize - 1)) || nrbitsp) {
611 unsigned char nrbits;
613 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
624 * Calculate the number of 512byte blocks used.
626 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
628 blkcnt_t used = (tsize + 511) >> 9;
629 return (used > ULONG_MAX) ? ULONG_MAX : used;
633 * Compute and set NFS server blocksize
636 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
638 if (bsize < NFS_MIN_FILE_IO_SIZE)
639 bsize = NFS_DEF_FILE_IO_SIZE;
640 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
641 bsize = NFS_MAX_FILE_IO_SIZE;
643 return nfs_block_bits(bsize, nrbitsp);
647 * Determine the maximum file size for a superblock
650 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
652 sb->s_maxbytes = (loff_t)maxfilesize;
653 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
654 sb->s_maxbytes = MAX_LFS_FILESIZE;
658 * Record the page as unstable and mark its inode as dirty.
661 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
664 struct inode *inode = page_file_mapping(page)->host;
666 inc_node_page_state(page, NR_UNSTABLE_NFS);
667 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
668 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
673 * Determine the number of bytes of data the page contains
676 unsigned int nfs_page_length(struct page *page)
678 loff_t i_size = i_size_read(page_file_mapping(page)->host);
681 pgoff_t index = page_index(page);
682 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
683 if (index < end_index)
685 if (index == end_index)
686 return ((i_size - 1) & ~PAGE_MASK) + 1;
692 * Convert a umode to a dirent->d_type
695 unsigned char nfs_umode_to_dtype(umode_t mode)
697 return (mode >> 12) & 15;
701 * Determine the number of pages in an array of length 'len' and
702 * with a base offset of 'base'
705 unsigned int nfs_page_array_len(unsigned int base, size_t len)
707 return ((unsigned long)len + (unsigned long)base +
708 PAGE_SIZE - 1) >> PAGE_SHIFT;
712 * Convert a struct timespec into a 64-bit change attribute
714 * This does approximately the same thing as timespec_to_ns(),
715 * but for calculation efficiency, we multiply the seconds by
719 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
721 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
726 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
727 * @fh - pointer to filehandle
729 * returns a crc32 hash for the filehandle that is compatible with
730 * the one displayed by "wireshark".
732 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
734 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
736 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
738 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
739 NFS4_STATEID_OTHER_SIZE);
742 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
746 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
752 static inline bool nfs_error_is_fatal(int err)