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/nfs_page.h>
11 #include <linux/wait_bit.h>
13 #define NFS_MS_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
15 extern const struct export_operations nfs_export_ops;
19 /* Maximum number of readahead requests
20 * FIXME: this should really be a sysctl so that users may tune it to suit
21 * their needs. People that do NFS over a slow network, might for
22 * instance want to reduce it to something closer to 1 for improved
23 * interactive response.
25 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
27 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
29 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
30 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
33 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
35 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
36 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
37 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
42 struct nfs_clone_mount {
43 const struct super_block *sb;
44 const struct dentry *dentry;
46 struct nfs_fattr *fattr;
49 struct sockaddr *addr;
51 rpc_authflavor_t authflavor;
55 * Note: RFC 1813 doesn't limit the number of auth flavors that
56 * a server can return, so make something up.
58 #define NFS_MAX_SECFLAVORS (12)
61 * Value used if the user did not specify a port value.
63 #define NFS_UNSPEC_PORT (-1)
65 #define NFS_UNSPEC_RETRANS (UINT_MAX)
66 #define NFS_UNSPEC_TIMEO (UINT_MAX)
69 * Maximum number of pages that readdir can use for creating
70 * a vmapped array of pages.
72 #define NFS_MAX_READDIR_PAGES 8
74 struct nfs_client_initdata {
75 unsigned long init_flags;
76 const char *hostname; /* Hostname of the server */
77 const struct sockaddr *addr; /* Address of the server */
78 const char *nodename; /* Hostname of the client */
79 const char *ip_addr; /* IP address of the client */
81 struct nfs_subversion *nfs_mod;
84 unsigned int nconnect;
86 const struct rpc_timeout *timeparms;
87 const struct cred *cred;
91 * In-kernel mount arguments
93 struct nfs_parsed_mount_data {
95 unsigned int rsize, wsize;
96 unsigned int timeo, retrans;
97 unsigned int acregmin, acregmax,
100 unsigned int options;
102 struct nfs_auth_info auth_info;
103 rpc_authflavor_t selected_flavor;
104 char *client_address;
105 unsigned int version;
106 unsigned int minorversion;
111 struct sockaddr_storage address;
116 unsigned short protocol;
120 struct sockaddr_storage address;
125 unsigned short protocol;
126 unsigned short nconnect;
134 struct nfs_mount_request {
135 struct sockaddr *sap;
140 unsigned short protocol;
143 unsigned int *auth_flav_len;
144 rpc_authflavor_t *auth_flavs;
148 struct nfs_mount_info {
149 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
150 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
151 struct nfs_parsed_mount_data *parsed;
152 struct nfs_clone_mount *cloned;
153 struct nfs_fh *mntfh;
156 extern int nfs_mount(struct nfs_mount_request *info);
157 extern void nfs_umount(const struct nfs_mount_request *info);
160 extern const struct rpc_program nfs_program;
161 extern void nfs_clients_init(struct net *net);
162 extern void nfs_clients_exit(struct net *net);
163 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
164 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
165 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
166 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
167 void nfs_server_insert_lists(struct nfs_server *);
168 void nfs_server_remove_lists(struct nfs_server *);
169 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
170 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
172 struct nfs_server *nfs_alloc_server(void);
173 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
175 extern void nfs_put_client(struct nfs_client *);
176 extern void nfs_free_client(struct nfs_client *);
177 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
178 extern struct nfs_client *
179 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
180 struct nfs4_sessionid *, u32);
181 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
182 struct nfs_subversion *);
183 extern struct nfs_server *nfs4_create_server(
184 struct nfs_mount_info *,
185 struct nfs_subversion *);
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;
240 extern int __init nfs_init_nfspagecache(void);
241 extern void nfs_destroy_nfspagecache(void);
242 extern int __init nfs_init_readpagecache(void);
243 extern void nfs_destroy_readpagecache(void);
244 extern int __init nfs_init_writepagecache(void);
245 extern void nfs_destroy_writepagecache(void);
247 extern int __init nfs_init_directcache(void);
248 extern void nfs_destroy_directcache(void);
249 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
250 struct nfs_pgio_header *hdr,
251 void (*release)(struct nfs_pgio_header *hdr));
252 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
253 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
255 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
256 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
257 void nfs_pgio_header_free(struct nfs_pgio_header *);
258 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
259 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
260 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
261 const struct rpc_call_ops *call_ops, int how, int flags);
262 void nfs_free_request(struct nfs_page *req);
263 struct nfs_pgio_mirror *
264 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
266 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
268 WARN_ON_ONCE(desc->pg_mirror_count < 1);
269 return desc->pg_mirror_count > 1;
272 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
273 const struct nfs_open_context *ctx2)
275 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
279 extern const struct rpc_procinfo nfs_procedures[];
280 extern int nfs2_decode_dirent(struct xdr_stream *,
281 struct nfs_entry *, bool);
284 extern const struct rpc_procinfo nfs3_procedures[];
285 extern int nfs3_decode_dirent(struct xdr_stream *,
286 struct nfs_entry *, bool);
289 #if IS_ENABLED(CONFIG_NFS_V4)
290 extern int nfs4_decode_dirent(struct xdr_stream *,
291 struct nfs_entry *, bool);
293 #ifdef CONFIG_NFS_V4_1
294 extern const u32 nfs41_maxread_overhead;
295 extern const u32 nfs41_maxwrite_overhead;
296 extern const u32 nfs41_maxgetdevinfo_overhead;
300 #if IS_ENABLED(CONFIG_NFS_V4)
301 extern const struct rpc_procinfo nfs4_procedures[];
304 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
305 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
306 static inline struct nfs4_label *
307 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
312 if (src->len > NFS4_MAXLABELLEN)
318 memcpy(dst->label, src->label, src->len);
322 static inline void nfs4_label_free(struct nfs4_label *label)
331 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
333 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
334 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
337 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
338 static inline void nfs4_label_free(void *label) {}
339 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
342 static inline struct nfs4_label *
343 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
347 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
350 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
351 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
352 const struct nfs_client_initdata *);
355 extern void nfs_advise_use_readdirplus(struct inode *dir);
356 extern void nfs_force_use_readdirplus(struct inode *dir);
357 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
358 struct shrink_control *sc);
359 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
360 struct shrink_control *sc);
361 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
362 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
363 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
364 int nfs_rmdir(struct inode *, struct dentry *);
365 int nfs_unlink(struct inode *, struct dentry *);
366 int nfs_symlink(struct inode *, struct dentry *, const char *);
367 int nfs_link(struct dentry *, struct inode *, struct dentry *);
368 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
369 int nfs_rename(struct inode *, struct dentry *,
370 struct inode *, struct dentry *, unsigned int);
373 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
374 loff_t nfs_file_llseek(struct file *, loff_t, int);
375 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
376 int nfs_file_mmap(struct file *, struct vm_area_struct *);
377 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
378 int nfs_file_release(struct inode *, struct file *);
379 int nfs_lock(struct file *, int, struct file_lock *);
380 int nfs_flock(struct file *, int, struct file_lock *);
381 int nfs_check_flags(int);
384 extern struct workqueue_struct *nfsiod_workqueue;
385 extern struct inode *nfs_alloc_inode(struct super_block *sb);
386 extern void nfs_free_inode(struct inode *);
387 extern int nfs_write_inode(struct inode *, struct writeback_control *);
388 extern int nfs_drop_inode(struct inode *);
389 extern void nfs_clear_inode(struct inode *);
390 extern void nfs_evict_inode(struct inode *);
391 void nfs_zap_acl_cache(struct inode *inode);
392 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
393 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
394 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
397 extern const struct super_operations nfs_sops;
398 extern struct file_system_type nfs_fs_type;
399 extern struct file_system_type nfs_xdev_fs_type;
400 #if IS_ENABLED(CONFIG_NFS_V4)
401 extern struct file_system_type nfs4_referral_fs_type;
403 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
404 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
405 struct nfs_subversion *);
406 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
407 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
408 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
409 struct nfs_mount_info *, struct nfs_subversion *);
410 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
411 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
412 const char *, struct nfs_mount_info *);
413 void nfs_kill_super(struct super_block *);
414 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
416 extern struct rpc_stat nfs_rpcstat;
418 extern int __init register_nfs_fs(void);
419 extern void __exit unregister_nfs_fs(void);
420 extern bool nfs_sb_active(struct super_block *sb);
421 extern void nfs_sb_deactive(struct super_block *sb);
424 extern void nfs_start_io_read(struct inode *inode);
425 extern void nfs_end_io_read(struct inode *inode);
426 extern void nfs_start_io_write(struct inode *inode);
427 extern void nfs_end_io_write(struct inode *inode);
428 extern void nfs_start_io_direct(struct inode *inode);
429 extern void nfs_end_io_direct(struct inode *inode);
431 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
433 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
437 #define NFS_PATH_CANONICAL 1
438 extern char *nfs_path(char **p, struct dentry *dentry,
439 char *buffer, ssize_t buflen, unsigned flags);
440 extern struct vfsmount *nfs_d_automount(struct path *path);
441 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
442 struct nfs_fh *, struct nfs_fattr *);
443 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
444 struct nfs_fattr *, rpc_authflavor_t);
447 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
449 #if IS_ENABLED(CONFIG_NFS_V4)
450 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
453 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
456 struct nfs_pgio_completion_ops;
458 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
459 struct inode *inode, bool force_mds,
460 const struct nfs_pgio_completion_ops *compl_ops);
461 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
462 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
465 void nfs_umount_begin(struct super_block *);
466 int nfs_statfs(struct dentry *, struct kstatfs *);
467 int nfs_show_options(struct seq_file *, struct dentry *);
468 int nfs_show_devname(struct seq_file *, struct dentry *);
469 int nfs_show_path(struct seq_file *, struct dentry *);
470 int nfs_show_stats(struct seq_file *, struct dentry *);
471 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
474 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
475 struct inode *inode, int ioflags, bool force_mds,
476 const struct nfs_pgio_completion_ops *compl_ops);
477 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
478 extern void nfs_commit_free(struct nfs_commit_data *p);
479 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
480 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
481 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
482 struct nfs_commit_data *data,
483 const struct nfs_rpc_ops *nfs_ops,
484 const struct rpc_call_ops *call_ops,
486 extern void nfs_init_commit(struct nfs_commit_data *data,
487 struct list_head *head,
488 struct pnfs_layout_segment *lseg,
489 struct nfs_commit_info *cinfo);
490 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
491 struct nfs_commit_info *cinfo, int max);
492 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
493 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
494 struct nfs_commit_info *cinfo);
495 void nfs_mark_request_commit(struct nfs_page *req,
496 struct pnfs_layout_segment *lseg,
497 struct nfs_commit_info *cinfo,
499 int nfs_write_need_commit(struct nfs_pgio_header *);
500 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
501 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
502 int how, struct nfs_commit_info *cinfo);
503 void nfs_retry_commit(struct list_head *page_list,
504 struct pnfs_layout_segment *lseg,
505 struct nfs_commit_info *cinfo,
507 void nfs_commitdata_release(struct nfs_commit_data *data);
508 void nfs_request_add_commit_list(struct nfs_page *req,
509 struct nfs_commit_info *cinfo);
510 void nfs_request_add_commit_list_locked(struct nfs_page *req,
511 struct list_head *dst,
512 struct nfs_commit_info *cinfo);
513 void nfs_request_remove_commit_list(struct nfs_page *req,
514 struct nfs_commit_info *cinfo);
515 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
517 struct nfs_direct_req *dreq);
518 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
519 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
520 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
522 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
523 loff_t lstart, loff_t lend);
525 #ifdef CONFIG_NFS_V4_1
527 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
531 for (i = 0; i < cinfo->nbuckets; i++)
532 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
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 extern struct rpc_task *
555 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
556 struct dentry *old_dentry, struct dentry *new_dentry,
557 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
558 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
561 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
562 struct nfs_direct_req *dreq);
563 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
566 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
567 const struct nfs_client_initdata *);
568 extern int nfs40_walk_client_list(struct nfs_client *clp,
569 struct nfs_client **result,
570 const struct cred *cred);
571 extern int nfs41_walk_client_list(struct nfs_client *clp,
572 struct nfs_client **result,
573 const struct cred *cred);
574 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
575 struct rpc_xprt *xprt,
578 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
580 inode = igrab(inode);
581 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
588 static inline void nfs_iput_and_deactive(struct inode *inode)
591 struct super_block *sb = inode->i_sb;
599 * Determine the device name as a string
601 static inline char *nfs_devname(struct dentry *dentry,
602 char *buffer, ssize_t buflen)
605 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
609 * Determine the actual block size (and log2 thereof)
612 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
614 /* make sure blocksize is a power of two */
615 if ((bsize & (bsize - 1)) || nrbitsp) {
616 unsigned char nrbits;
618 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
629 * Calculate the number of 512byte blocks used.
631 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
633 blkcnt_t used = (tsize + 511) >> 9;
634 return (used > ULONG_MAX) ? ULONG_MAX : used;
638 * Compute and set NFS server blocksize
641 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
643 if (bsize < NFS_MIN_FILE_IO_SIZE)
644 bsize = NFS_DEF_FILE_IO_SIZE;
645 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
646 bsize = NFS_MAX_FILE_IO_SIZE;
648 return nfs_block_bits(bsize, nrbitsp);
652 * Determine the maximum file size for a superblock
655 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
657 sb->s_maxbytes = (loff_t)maxfilesize;
658 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
659 sb->s_maxbytes = MAX_LFS_FILESIZE;
663 * Record the page as unstable and mark its inode as dirty.
666 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
669 struct inode *inode = page_file_mapping(page)->host;
671 inc_node_page_state(page, NR_UNSTABLE_NFS);
672 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
673 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
678 * Determine the number of bytes of data the page contains
681 unsigned int nfs_page_length(struct page *page)
683 loff_t i_size = i_size_read(page_file_mapping(page)->host);
686 pgoff_t index = page_index(page);
687 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
688 if (index < end_index)
690 if (index == end_index)
691 return ((i_size - 1) & ~PAGE_MASK) + 1;
697 * Convert a umode to a dirent->d_type
700 unsigned char nfs_umode_to_dtype(umode_t mode)
702 return (mode >> 12) & 15;
706 * Determine the number of pages in an array of length 'len' and
707 * with a base offset of 'base'
710 unsigned int nfs_page_array_len(unsigned int base, size_t len)
712 return ((unsigned long)len + (unsigned long)base +
713 PAGE_SIZE - 1) >> PAGE_SHIFT;
717 * Convert a struct timespec into a 64-bit change attribute
719 * This does approximately the same thing as timespec_to_ns(),
720 * but for calculation efficiency, we multiply the seconds by
724 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
726 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
731 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
732 * @fh - pointer to filehandle
734 * returns a crc32 hash for the filehandle that is compatible with
735 * the one displayed by "wireshark".
737 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
739 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
741 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
743 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
744 NFS4_STATEID_OTHER_SIZE);
747 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
751 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
757 static inline bool nfs_error_is_fatal(int err)