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)
14 extern const struct export_operations nfs_export_ops;
18 /* Maximum number of readahead requests
19 * FIXME: this should really be a sysctl so that users may tune it to suit
20 * their needs. People that do NFS over a slow network, might for
21 * instance want to reduce it to something closer to 1 for improved
22 * interactive response.
24 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
26 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
28 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
29 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
32 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
34 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
35 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
36 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
41 struct nfs_clone_mount {
42 const struct super_block *sb;
43 const struct dentry *dentry;
45 struct nfs_fattr *fattr;
48 struct sockaddr *addr;
50 rpc_authflavor_t authflavor;
54 * Note: RFC 1813 doesn't limit the number of auth flavors that
55 * a server can return, so make something up.
57 #define NFS_MAX_SECFLAVORS (12)
60 * Value used if the user did not specify a port value.
62 #define NFS_UNSPEC_PORT (-1)
64 #define NFS_UNSPEC_RETRANS (UINT_MAX)
65 #define NFS_UNSPEC_TIMEO (UINT_MAX)
68 * Maximum number of pages that readdir can use for creating
69 * a vmapped array of pages.
71 #define NFS_MAX_READDIR_PAGES 8
73 struct nfs_client_initdata {
74 unsigned long init_flags;
75 const char *hostname; /* Hostname of the server */
76 const struct sockaddr *addr; /* Address of the server */
77 const char *nodename; /* Hostname of the client */
78 const char *ip_addr; /* IP address of the client */
80 struct nfs_subversion *nfs_mod;
84 const struct rpc_timeout *timeparms;
88 * In-kernel mount arguments
90 struct nfs_parsed_mount_data {
92 unsigned int rsize, wsize;
93 unsigned int timeo, retrans;
94 unsigned int acregmin, acregmax,
99 struct nfs_auth_info auth_info;
100 rpc_authflavor_t selected_flavor;
101 char *client_address;
102 unsigned int version;
103 unsigned int minorversion;
108 struct sockaddr_storage address;
113 unsigned short protocol;
117 struct sockaddr_storage address;
122 unsigned short protocol;
125 struct security_mnt_opts lsm_opts;
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 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
146 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
147 struct nfs_parsed_mount_data *parsed;
148 struct nfs_clone_mount *cloned;
149 struct nfs_fh *mntfh;
152 extern int nfs_mount(struct nfs_mount_request *info);
153 extern void nfs_umount(const struct nfs_mount_request *info);
156 extern const struct rpc_program nfs_program;
157 extern void nfs_clients_init(struct net *net);
158 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
159 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
160 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
161 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
162 void nfs_server_insert_lists(struct nfs_server *);
163 void nfs_server_remove_lists(struct nfs_server *);
164 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
165 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
167 struct nfs_server *nfs_alloc_server(void);
168 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
170 extern void nfs_cleanup_cb_ident_idr(struct net *);
171 extern void nfs_put_client(struct nfs_client *);
172 extern void nfs_free_client(struct nfs_client *);
173 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
174 extern struct nfs_client *
175 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
176 struct nfs4_sessionid *, u32);
177 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
178 struct nfs_subversion *);
179 extern struct nfs_server *nfs4_create_server(
180 struct nfs_mount_info *,
181 struct nfs_subversion *);
182 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
184 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
185 struct sockaddr *sap, size_t salen,
187 extern void nfs_free_server(struct nfs_server *server);
188 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
192 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
193 extern int nfs_client_init_status(const struct nfs_client *clp);
194 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
195 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
196 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
197 const struct sockaddr *ds_addr,
198 int ds_addrlen, int ds_proto,
199 unsigned int ds_timeo,
200 unsigned int ds_retrans,
202 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
204 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
205 const struct sockaddr *ds_addr, int ds_addrlen,
206 int ds_proto, unsigned int ds_timeo,
207 unsigned int ds_retrans);
208 #ifdef CONFIG_PROC_FS
209 extern int __init nfs_fs_proc_init(void);
210 extern void nfs_fs_proc_exit(void);
211 extern int nfs_fs_proc_net_init(struct net *net);
212 extern void nfs_fs_proc_net_exit(struct net *net);
214 static inline int nfs_fs_proc_net_init(struct net *net)
218 static inline void nfs_fs_proc_net_exit(struct net *net)
221 static inline int nfs_fs_proc_init(void)
225 static inline void nfs_fs_proc_exit(void)
231 extern const struct svc_version nfs4_callback_version1;
232 extern const struct svc_version nfs4_callback_version4;
234 struct nfs_pageio_descriptor;
236 extern int __init nfs_init_nfspagecache(void);
237 extern void nfs_destroy_nfspagecache(void);
238 extern int __init nfs_init_readpagecache(void);
239 extern void nfs_destroy_readpagecache(void);
240 extern int __init nfs_init_writepagecache(void);
241 extern void nfs_destroy_writepagecache(void);
243 extern int __init nfs_init_directcache(void);
244 extern void nfs_destroy_directcache(void);
245 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
246 struct nfs_pgio_header *hdr,
247 void (*release)(struct nfs_pgio_header *hdr));
248 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
249 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
251 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
252 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
253 void nfs_pgio_header_free(struct nfs_pgio_header *);
254 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
255 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
256 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
257 const struct rpc_call_ops *call_ops, int how, int flags);
258 void nfs_free_request(struct nfs_page *req);
259 struct nfs_pgio_mirror *
260 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
262 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
264 WARN_ON_ONCE(desc->pg_mirror_count < 1);
265 return desc->pg_mirror_count > 1;
268 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
269 const struct nfs_open_context *ctx2)
271 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
275 extern const struct rpc_procinfo nfs_procedures[];
276 extern int nfs2_decode_dirent(struct xdr_stream *,
277 struct nfs_entry *, bool);
280 extern const struct rpc_procinfo nfs3_procedures[];
281 extern int nfs3_decode_dirent(struct xdr_stream *,
282 struct nfs_entry *, bool);
285 #if IS_ENABLED(CONFIG_NFS_V4)
286 extern int nfs4_decode_dirent(struct xdr_stream *,
287 struct nfs_entry *, bool);
289 #ifdef CONFIG_NFS_V4_1
290 extern const u32 nfs41_maxread_overhead;
291 extern const u32 nfs41_maxwrite_overhead;
292 extern const u32 nfs41_maxgetdevinfo_overhead;
296 #if IS_ENABLED(CONFIG_NFS_V4)
297 extern const struct rpc_procinfo nfs4_procedures[];
300 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
301 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
302 static inline struct nfs4_label *
303 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
308 if (src->len > NFS4_MAXLABELLEN)
314 memcpy(dst->label, src->label, src->len);
318 static inline void nfs4_label_free(struct nfs4_label *label)
327 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
329 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
330 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
333 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
334 static inline void nfs4_label_free(void *label) {}
335 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
338 static inline struct nfs4_label *
339 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
343 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
346 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
347 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
348 const struct nfs_client_initdata *);
351 extern void nfs_advise_use_readdirplus(struct inode *dir);
352 extern void nfs_force_use_readdirplus(struct inode *dir);
353 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
354 struct shrink_control *sc);
355 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
356 struct shrink_control *sc);
357 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
358 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
359 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
360 int nfs_rmdir(struct inode *, struct dentry *);
361 int nfs_unlink(struct inode *, struct dentry *);
362 int nfs_symlink(struct inode *, struct dentry *, const char *);
363 int nfs_link(struct dentry *, struct inode *, struct dentry *);
364 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
365 int nfs_rename(struct inode *, struct dentry *,
366 struct inode *, struct dentry *, unsigned int);
369 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
370 loff_t nfs_file_llseek(struct file *, loff_t, int);
371 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
372 int nfs_file_mmap(struct file *, struct vm_area_struct *);
373 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
374 int nfs_file_release(struct inode *, struct file *);
375 int nfs_lock(struct file *, int, struct file_lock *);
376 int nfs_flock(struct file *, int, struct file_lock *);
377 int nfs_check_flags(int);
380 extern struct workqueue_struct *nfsiod_workqueue;
381 extern struct inode *nfs_alloc_inode(struct super_block *sb);
382 extern void nfs_destroy_inode(struct inode *);
383 extern int nfs_write_inode(struct inode *, struct writeback_control *);
384 extern int nfs_drop_inode(struct inode *);
385 extern void nfs_clear_inode(struct inode *);
386 extern void nfs_evict_inode(struct inode *);
387 void nfs_zap_acl_cache(struct inode *inode);
388 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
389 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
390 extern int nfs_wait_atomic_killable(atomic_t *p);
393 extern const struct super_operations nfs_sops;
394 extern struct file_system_type nfs_fs_type;
395 extern struct file_system_type nfs_xdev_fs_type;
396 #if IS_ENABLED(CONFIG_NFS_V4)
397 extern struct file_system_type nfs4_xdev_fs_type;
398 extern struct file_system_type nfs4_referral_fs_type;
400 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
401 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
402 struct nfs_subversion *);
403 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
404 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
405 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
406 struct nfs_mount_info *, struct nfs_subversion *);
407 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
408 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
409 const char *, struct nfs_mount_info *);
410 void nfs_kill_super(struct super_block *);
411 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
413 extern struct rpc_stat nfs_rpcstat;
415 extern int __init register_nfs_fs(void);
416 extern void __exit unregister_nfs_fs(void);
417 extern bool nfs_sb_active(struct super_block *sb);
418 extern void nfs_sb_deactive(struct super_block *sb);
421 extern void nfs_start_io_read(struct inode *inode);
422 extern void nfs_end_io_read(struct inode *inode);
423 extern void nfs_start_io_write(struct inode *inode);
424 extern void nfs_end_io_write(struct inode *inode);
425 extern void nfs_start_io_direct(struct inode *inode);
426 extern void nfs_end_io_direct(struct inode *inode);
428 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
430 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
434 #define NFS_PATH_CANONICAL 1
435 extern char *nfs_path(char **p, struct dentry *dentry,
436 char *buffer, ssize_t buflen, unsigned flags);
437 extern struct vfsmount *nfs_d_automount(struct path *path);
438 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
439 struct nfs_fh *, struct nfs_fattr *);
440 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
441 struct nfs_fattr *, rpc_authflavor_t);
444 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
446 #if IS_ENABLED(CONFIG_NFS_V4)
447 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
450 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
453 struct nfs_pgio_completion_ops;
455 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
456 struct inode *inode, bool force_mds,
457 const struct nfs_pgio_completion_ops *compl_ops);
458 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
459 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
462 void nfs_umount_begin(struct super_block *);
463 int nfs_statfs(struct dentry *, struct kstatfs *);
464 int nfs_show_options(struct seq_file *, struct dentry *);
465 int nfs_show_devname(struct seq_file *, struct dentry *);
466 int nfs_show_path(struct seq_file *, struct dentry *);
467 int nfs_show_stats(struct seq_file *, struct dentry *);
468 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
471 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
472 struct inode *inode, int ioflags, bool force_mds,
473 const struct nfs_pgio_completion_ops *compl_ops);
474 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
475 extern void nfs_commit_free(struct nfs_commit_data *p);
476 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
477 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
478 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
479 struct nfs_commit_data *data,
480 const struct nfs_rpc_ops *nfs_ops,
481 const struct rpc_call_ops *call_ops,
483 extern void nfs_init_commit(struct nfs_commit_data *data,
484 struct list_head *head,
485 struct pnfs_layout_segment *lseg,
486 struct nfs_commit_info *cinfo);
487 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
488 struct nfs_commit_info *cinfo, int max);
489 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
490 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
491 struct nfs_commit_info *cinfo);
492 void nfs_mark_request_commit(struct nfs_page *req,
493 struct pnfs_layout_segment *lseg,
494 struct nfs_commit_info *cinfo,
496 int nfs_write_need_commit(struct nfs_pgio_header *);
497 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
498 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
499 int how, struct nfs_commit_info *cinfo);
500 void nfs_retry_commit(struct list_head *page_list,
501 struct pnfs_layout_segment *lseg,
502 struct nfs_commit_info *cinfo,
504 void nfs_commitdata_release(struct nfs_commit_data *data);
505 void nfs_request_add_commit_list(struct nfs_page *req,
506 struct nfs_commit_info *cinfo);
507 void nfs_request_add_commit_list_locked(struct nfs_page *req,
508 struct list_head *dst,
509 struct nfs_commit_info *cinfo);
510 void nfs_request_remove_commit_list(struct nfs_page *req,
511 struct nfs_commit_info *cinfo);
512 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
514 struct nfs_direct_req *dreq);
515 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
516 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
517 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
519 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
520 loff_t lstart, loff_t lend);
522 #ifdef CONFIG_NFS_V4_1
524 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
528 for (i = 0; i < cinfo->nbuckets; i++)
529 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
533 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
538 #ifdef CONFIG_MIGRATION
539 extern int nfs_migrate_page(struct address_space *,
540 struct page *, struct page *, enum migrate_mode);
544 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
545 const struct nfs_write_verifier *v2)
547 return memcmp(v1->data, v2->data, sizeof(v1->data));
551 extern struct rpc_task *
552 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
553 struct dentry *old_dentry, struct dentry *new_dentry,
554 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
555 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
558 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
559 struct nfs_direct_req *dreq);
560 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
563 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
564 const struct nfs_client_initdata *);
565 extern int nfs40_walk_client_list(struct nfs_client *clp,
566 struct nfs_client **result,
567 struct rpc_cred *cred);
568 extern int nfs41_walk_client_list(struct nfs_client *clp,
569 struct nfs_client **result,
570 struct rpc_cred *cred);
571 extern int nfs4_test_session_trunk(struct rpc_clnt *,
575 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
577 inode = igrab(inode);
578 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
585 static inline void nfs_iput_and_deactive(struct inode *inode)
588 struct super_block *sb = inode->i_sb;
596 * Determine the device name as a string
598 static inline char *nfs_devname(struct dentry *dentry,
599 char *buffer, ssize_t buflen)
602 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
606 * Determine the actual block size (and log2 thereof)
609 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
611 /* make sure blocksize is a power of two */
612 if ((bsize & (bsize - 1)) || nrbitsp) {
613 unsigned char nrbits;
615 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
626 * Calculate the number of 512byte blocks used.
628 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
630 blkcnt_t used = (tsize + 511) >> 9;
631 return (used > ULONG_MAX) ? ULONG_MAX : used;
635 * Compute and set NFS server blocksize
638 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
640 if (bsize < NFS_MIN_FILE_IO_SIZE)
641 bsize = NFS_DEF_FILE_IO_SIZE;
642 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
643 bsize = NFS_MAX_FILE_IO_SIZE;
645 return nfs_block_bits(bsize, nrbitsp);
649 * Determine the maximum file size for a superblock
652 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
654 sb->s_maxbytes = (loff_t)maxfilesize;
655 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
656 sb->s_maxbytes = MAX_LFS_FILESIZE;
660 * Record the page as unstable and mark its inode as dirty.
663 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
666 struct inode *inode = page_file_mapping(page)->host;
668 inc_node_page_state(page, NR_UNSTABLE_NFS);
669 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
670 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
675 * Determine the number of bytes of data the page contains
678 unsigned int nfs_page_length(struct page *page)
680 loff_t i_size = i_size_read(page_file_mapping(page)->host);
683 pgoff_t index = page_index(page);
684 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
685 if (index < end_index)
687 if (index == end_index)
688 return ((i_size - 1) & ~PAGE_MASK) + 1;
694 * Convert a umode to a dirent->d_type
697 unsigned char nfs_umode_to_dtype(umode_t mode)
699 return (mode >> 12) & 15;
703 * Determine the number of pages in an array of length 'len' and
704 * with a base offset of 'base'
707 unsigned int nfs_page_array_len(unsigned int base, size_t len)
709 return ((unsigned long)len + (unsigned long)base +
710 PAGE_SIZE - 1) >> PAGE_SHIFT;
714 * Convert a struct timespec into a 64-bit change attribute
716 * This does approximately the same thing as timespec_to_ns(),
717 * but for calculation efficiency, we multiply the seconds by
721 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
723 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
728 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
729 * @fh - pointer to filehandle
731 * returns a crc32 hash for the filehandle that is compatible with
732 * the one displayed by "wireshark".
734 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
736 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
738 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
740 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
741 NFS4_STATEID_OTHER_SIZE);
744 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
748 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
754 static inline bool nfs_error_is_fatal(int err)