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>
10 #include <linux/wait_bit.h>
12 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
16 /* Maximum number of readahead requests
17 * FIXME: this should really be a sysctl so that users may tune it to suit
18 * their needs. People that do NFS over a slow network, might for
19 * instance want to reduce it to something closer to 1 for improved
20 * interactive response.
22 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
24 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
26 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
27 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
30 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
32 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
33 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
34 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
39 struct nfs_clone_mount {
40 const struct super_block *sb;
41 const struct dentry *dentry;
43 struct nfs_fattr *fattr;
46 struct sockaddr *addr;
48 rpc_authflavor_t authflavor;
52 * Note: RFC 1813 doesn't limit the number of auth flavors that
53 * a server can return, so make something up.
55 #define NFS_MAX_SECFLAVORS (12)
58 * Value used if the user did not specify a port value.
60 #define NFS_UNSPEC_PORT (-1)
62 #define NFS_UNSPEC_RETRANS (UINT_MAX)
63 #define NFS_UNSPEC_TIMEO (UINT_MAX)
66 * Maximum number of pages that readdir can use for creating
67 * a vmapped array of pages.
69 #define NFS_MAX_READDIR_PAGES 8
71 struct nfs_client_initdata {
72 unsigned long init_flags;
73 const char *hostname; /* Hostname of the server */
74 const struct sockaddr *addr; /* Address of the server */
75 const char *nodename; /* Hostname of the client */
76 const char *ip_addr; /* IP address of the client */
78 struct nfs_subversion *nfs_mod;
82 const struct rpc_timeout *timeparms;
86 * In-kernel mount arguments
88 struct nfs_parsed_mount_data {
90 unsigned int rsize, wsize;
91 unsigned int timeo, retrans;
92 unsigned int acregmin, acregmax,
97 struct nfs_auth_info auth_info;
98 rpc_authflavor_t selected_flavor;
100 unsigned int version;
101 unsigned int minorversion;
106 struct sockaddr_storage address;
111 unsigned short protocol;
115 struct sockaddr_storage address;
120 unsigned short protocol;
123 struct security_mnt_opts lsm_opts;
128 struct nfs_mount_request {
129 struct sockaddr *sap;
134 unsigned short protocol;
137 unsigned int *auth_flav_len;
138 rpc_authflavor_t *auth_flavs;
142 struct nfs_mount_info {
143 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
144 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
145 struct nfs_parsed_mount_data *parsed;
146 struct nfs_clone_mount *cloned;
147 struct nfs_fh *mntfh;
150 extern int nfs_mount(struct nfs_mount_request *info);
151 extern void nfs_umount(const struct nfs_mount_request *info);
154 extern const struct rpc_program nfs_program;
155 extern void nfs_clients_init(struct net *net);
156 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
157 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
158 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
159 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
160 void nfs_server_insert_lists(struct nfs_server *);
161 void nfs_server_remove_lists(struct nfs_server *);
162 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
163 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
165 struct nfs_server *nfs_alloc_server(void);
166 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
168 extern void nfs_cleanup_cb_ident_idr(struct net *);
169 extern void nfs_put_client(struct nfs_client *);
170 extern void nfs_free_client(struct nfs_client *);
171 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
172 extern struct nfs_client *
173 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
174 struct nfs4_sessionid *, u32);
175 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
176 struct nfs_subversion *);
177 extern struct nfs_server *nfs4_create_server(
178 struct nfs_mount_info *,
179 struct nfs_subversion *);
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 struct svc_version nfs4_callback_version1;
230 extern struct svc_version nfs4_callback_version4;
232 struct nfs_pageio_descriptor;
234 extern int __init nfs_init_nfspagecache(void);
235 extern void nfs_destroy_nfspagecache(void);
236 extern int __init nfs_init_readpagecache(void);
237 extern void nfs_destroy_readpagecache(void);
238 extern int __init nfs_init_writepagecache(void);
239 extern void nfs_destroy_writepagecache(void);
241 extern int __init nfs_init_directcache(void);
242 extern void nfs_destroy_directcache(void);
243 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
244 struct nfs_pgio_header *hdr,
245 void (*release)(struct nfs_pgio_header *hdr));
246 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
247 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
249 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
250 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
251 void nfs_pgio_header_free(struct nfs_pgio_header *);
252 void nfs_pgio_data_destroy(struct nfs_pgio_header *);
253 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
254 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
255 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
256 const struct rpc_call_ops *call_ops, int how, int flags);
257 void nfs_free_request(struct nfs_page *req);
258 struct nfs_pgio_mirror *
259 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
261 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
263 WARN_ON_ONCE(desc->pg_mirror_count < 1);
264 return desc->pg_mirror_count > 1;
267 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
268 const struct nfs_open_context *ctx2)
270 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
274 extern struct rpc_procinfo nfs_procedures[];
275 extern int nfs2_decode_dirent(struct xdr_stream *,
276 struct nfs_entry *, int);
279 extern struct rpc_procinfo nfs3_procedures[];
280 extern int nfs3_decode_dirent(struct xdr_stream *,
281 struct nfs_entry *, int);
284 #if IS_ENABLED(CONFIG_NFS_V4)
285 extern int nfs4_decode_dirent(struct xdr_stream *,
286 struct nfs_entry *, int);
288 #ifdef CONFIG_NFS_V4_1
289 extern const u32 nfs41_maxread_overhead;
290 extern const u32 nfs41_maxwrite_overhead;
291 extern const u32 nfs41_maxgetdevinfo_overhead;
295 #if IS_ENABLED(CONFIG_NFS_V4)
296 extern struct rpc_procinfo nfs4_procedures[];
299 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
300 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
301 static inline struct nfs4_label *
302 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
307 if (src->len > NFS4_MAXLABELLEN)
313 memcpy(dst->label, src->label, src->len);
317 static inline void nfs4_label_free(struct nfs4_label *label)
326 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
328 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
329 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
332 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
333 static inline void nfs4_label_free(void *label) {}
334 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
337 static inline struct nfs4_label *
338 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
342 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
345 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
346 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
347 const struct nfs_client_initdata *);
350 extern void nfs_advise_use_readdirplus(struct inode *dir);
351 extern void nfs_force_use_readdirplus(struct inode *dir);
352 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
353 struct shrink_control *sc);
354 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
355 struct shrink_control *sc);
356 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
357 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
358 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
359 int nfs_rmdir(struct inode *, struct dentry *);
360 int nfs_unlink(struct inode *, struct dentry *);
361 int nfs_symlink(struct inode *, struct dentry *, const char *);
362 int nfs_link(struct dentry *, struct inode *, struct dentry *);
363 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
364 int nfs_rename(struct inode *, struct dentry *,
365 struct inode *, struct dentry *, unsigned int);
368 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
369 loff_t nfs_file_llseek(struct file *, loff_t, int);
370 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
371 int nfs_file_mmap(struct file *, struct vm_area_struct *);
372 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
373 int nfs_file_release(struct inode *, struct file *);
374 int nfs_lock(struct file *, int, struct file_lock *);
375 int nfs_flock(struct file *, int, struct file_lock *);
376 int nfs_check_flags(int);
379 extern struct workqueue_struct *nfsiod_workqueue;
380 extern struct inode *nfs_alloc_inode(struct super_block *sb);
381 extern void nfs_destroy_inode(struct inode *);
382 extern int nfs_write_inode(struct inode *, struct writeback_control *);
383 extern int nfs_drop_inode(struct inode *);
384 extern void nfs_clear_inode(struct inode *);
385 extern void nfs_evict_inode(struct inode *);
386 void nfs_zap_acl_cache(struct inode *inode);
387 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
388 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
389 extern int nfs_wait_atomic_killable(atomic_t *p);
392 extern const struct super_operations nfs_sops;
393 extern struct file_system_type nfs_fs_type;
394 extern struct file_system_type nfs_xdev_fs_type;
395 #if IS_ENABLED(CONFIG_NFS_V4)
396 extern struct file_system_type nfs4_xdev_fs_type;
397 extern struct file_system_type nfs4_referral_fs_type;
399 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
400 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
401 struct nfs_subversion *);
402 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
403 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
404 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
405 struct nfs_mount_info *, struct nfs_subversion *);
406 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
407 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
408 const char *, struct nfs_mount_info *);
409 void nfs_kill_super(struct super_block *);
410 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
412 extern struct rpc_stat nfs_rpcstat;
414 extern int __init register_nfs_fs(void);
415 extern void __exit unregister_nfs_fs(void);
416 extern bool nfs_sb_active(struct super_block *sb);
417 extern void nfs_sb_deactive(struct super_block *sb);
420 extern void nfs_start_io_read(struct inode *inode);
421 extern void nfs_end_io_read(struct inode *inode);
422 extern void nfs_start_io_write(struct inode *inode);
423 extern void nfs_end_io_write(struct inode *inode);
424 extern void nfs_start_io_direct(struct inode *inode);
425 extern void nfs_end_io_direct(struct inode *inode);
427 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
429 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
433 #define NFS_PATH_CANONICAL 1
434 extern char *nfs_path(char **p, struct dentry *dentry,
435 char *buffer, ssize_t buflen, unsigned flags);
436 extern struct vfsmount *nfs_d_automount(struct path *path);
437 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
438 struct nfs_fh *, struct nfs_fattr *);
439 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
440 struct nfs_fattr *, rpc_authflavor_t);
443 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
445 #if IS_ENABLED(CONFIG_NFS_V4)
446 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
449 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
452 struct nfs_pgio_completion_ops;
454 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
455 struct inode *inode, bool force_mds,
456 const struct nfs_pgio_completion_ops *compl_ops);
457 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
458 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
461 void nfs_umount_begin(struct super_block *);
462 int nfs_statfs(struct dentry *, struct kstatfs *);
463 int nfs_show_options(struct seq_file *, struct dentry *);
464 int nfs_show_devname(struct seq_file *, struct dentry *);
465 int nfs_show_path(struct seq_file *, struct dentry *);
466 int nfs_show_stats(struct seq_file *, struct dentry *);
467 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
470 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
471 struct inode *inode, int ioflags, bool force_mds,
472 const struct nfs_pgio_completion_ops *compl_ops);
473 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
474 extern void nfs_commit_free(struct nfs_commit_data *p);
475 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
476 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
477 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
478 struct nfs_commit_data *data,
479 const struct nfs_rpc_ops *nfs_ops,
480 const struct rpc_call_ops *call_ops,
482 extern void nfs_init_commit(struct nfs_commit_data *data,
483 struct list_head *head,
484 struct pnfs_layout_segment *lseg,
485 struct nfs_commit_info *cinfo);
486 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
487 struct nfs_commit_info *cinfo, int max);
488 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
489 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
490 struct nfs_commit_info *cinfo);
491 void nfs_mark_request_commit(struct nfs_page *req,
492 struct pnfs_layout_segment *lseg,
493 struct nfs_commit_info *cinfo,
495 int nfs_write_need_commit(struct nfs_pgio_header *);
496 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
497 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
498 int how, struct nfs_commit_info *cinfo);
499 void nfs_retry_commit(struct list_head *page_list,
500 struct pnfs_layout_segment *lseg,
501 struct nfs_commit_info *cinfo,
503 void nfs_commitdata_release(struct nfs_commit_data *data);
504 void nfs_request_add_commit_list(struct nfs_page *req,
505 struct nfs_commit_info *cinfo);
506 void nfs_request_add_commit_list_locked(struct nfs_page *req,
507 struct list_head *dst,
508 struct nfs_commit_info *cinfo);
509 void nfs_request_remove_commit_list(struct nfs_page *req,
510 struct nfs_commit_info *cinfo);
511 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
513 struct nfs_direct_req *dreq);
514 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
515 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
516 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
518 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
519 loff_t lstart, loff_t lend);
521 #ifdef CONFIG_NFS_V4_1
523 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
527 for (i = 0; i < cinfo->nbuckets; i++)
528 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
532 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
537 #ifdef CONFIG_MIGRATION
538 extern int nfs_migrate_page(struct address_space *,
539 struct page *, struct page *, enum migrate_mode);
543 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
544 const struct nfs_write_verifier *v2)
546 return memcmp(v1->data, v2->data, sizeof(v1->data));
550 extern struct rpc_task *
551 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
552 struct dentry *old_dentry, struct dentry *new_dentry,
553 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
554 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
557 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
558 struct nfs_direct_req *dreq);
559 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
562 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
563 const struct nfs_client_initdata *);
564 extern int nfs40_walk_client_list(struct nfs_client *clp,
565 struct nfs_client **result,
566 struct rpc_cred *cred);
567 extern int nfs41_walk_client_list(struct nfs_client *clp,
568 struct nfs_client **result,
569 struct rpc_cred *cred);
570 extern int nfs4_test_session_trunk(struct rpc_clnt *,
574 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
576 inode = igrab(inode);
577 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
584 static inline void nfs_iput_and_deactive(struct inode *inode)
587 struct super_block *sb = inode->i_sb;
595 * Determine the device name as a string
597 static inline char *nfs_devname(struct dentry *dentry,
598 char *buffer, ssize_t buflen)
601 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
605 * Determine the actual block size (and log2 thereof)
608 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
610 /* make sure blocksize is a power of two */
611 if ((bsize & (bsize - 1)) || nrbitsp) {
612 unsigned char nrbits;
614 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
625 * Calculate the number of 512byte blocks used.
627 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
629 blkcnt_t used = (tsize + 511) >> 9;
630 return (used > ULONG_MAX) ? ULONG_MAX : used;
634 * Compute and set NFS server blocksize
637 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
639 if (bsize < NFS_MIN_FILE_IO_SIZE)
640 bsize = NFS_DEF_FILE_IO_SIZE;
641 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
642 bsize = NFS_MAX_FILE_IO_SIZE;
644 return nfs_block_bits(bsize, nrbitsp);
648 * Determine the maximum file size for a superblock
651 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
653 sb->s_maxbytes = (loff_t)maxfilesize;
654 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
655 sb->s_maxbytes = MAX_LFS_FILESIZE;
659 * Record the page as unstable and mark its inode as dirty.
662 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
665 struct inode *inode = page_file_mapping(page)->host;
667 inc_node_page_state(page, NR_UNSTABLE_NFS);
668 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
669 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
674 * Determine the number of bytes of data the page contains
677 unsigned int nfs_page_length(struct page *page)
679 loff_t i_size = i_size_read(page_file_mapping(page)->host);
682 pgoff_t index = page_index(page);
683 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
684 if (index < end_index)
686 if (index == end_index)
687 return ((i_size - 1) & ~PAGE_MASK) + 1;
693 * Convert a umode to a dirent->d_type
696 unsigned char nfs_umode_to_dtype(umode_t mode)
698 return (mode >> 12) & 15;
702 * Determine the number of pages in an array of length 'len' and
703 * with a base offset of 'base'
706 unsigned int nfs_page_array_len(unsigned int base, size_t len)
708 return ((unsigned long)len + (unsigned long)base +
709 PAGE_SIZE - 1) >> PAGE_SHIFT;
713 * Convert a struct timespec into a 64-bit change attribute
715 * This does approximately the same thing as timespec_to_ns(),
716 * but for calculation efficiency, we multiply the seconds by
720 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
722 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
727 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
728 * @fh - pointer to filehandle
730 * returns a crc32 hash for the filehandle that is compatible with
731 * the one displayed by "wireshark".
733 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
735 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
737 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
739 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
740 NFS4_STATEID_OTHER_SIZE);
743 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
747 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
753 static inline bool nfs_error_is_fatal(int err)