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)
59 struct nfs_client_initdata {
60 unsigned long init_flags;
61 const char *hostname; /* Hostname of the server */
62 const struct sockaddr *addr; /* Address of the server */
63 const char *nodename; /* Hostname of the client */
64 const char *ip_addr; /* IP address of the client */
66 struct nfs_subversion *nfs_mod;
69 unsigned int nconnect;
71 const struct rpc_timeout *timeparms;
72 const struct cred *cred;
76 * In-kernel mount arguments
78 struct nfs_fs_context {
80 bool skip_reconfig_option_check;
83 unsigned int flags; /* NFS{,4}_MOUNT_* flags */
84 unsigned int rsize, wsize;
85 unsigned int timeo, retrans;
86 unsigned int acregmin, acregmax;
87 unsigned int acdirmin, acdirmax;
91 struct nfs_auth_info auth_info;
92 rpc_authflavor_t selected_flavor;
95 unsigned int minorversion;
97 unsigned short protofamily;
98 unsigned short mountfamily;
102 struct sockaddr address;
103 struct sockaddr_storage _address;
109 unsigned short protocol;
114 struct sockaddr address;
115 struct sockaddr_storage _address;
121 unsigned short protocol;
122 unsigned short nconnect;
123 unsigned short export_path_len;
126 struct nfs_fh *mntfh;
127 struct nfs_server *server;
128 struct nfs_subversion *nfs_mod;
130 /* Information for a cloned mount. */
131 struct nfs_clone_mount {
132 struct super_block *sb;
133 struct dentry *dentry;
134 struct nfs_fattr *fattr;
135 unsigned int inherited_bsize;
139 #define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \
140 errorf(fc, fmt, ## __VA_ARGS__) : \
141 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
143 #define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \
144 errorf(fc, fmt, ## __VA_ARGS__) : \
145 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
147 #define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \
148 invalf(fc, fmt, ## __VA_ARGS__) : \
149 ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; }))
151 #define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \
152 invalf(fc, fmt, ## __VA_ARGS__) : \
153 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; }))
155 #define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \
156 warnf(fc, fmt, ## __VA_ARGS__) : \
157 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
159 #define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \
160 warnf(fc, fmt, ## __VA_ARGS__) : \
161 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
163 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
165 return fc->fs_private;
169 struct nfs_mount_request {
170 struct sockaddr *sap;
175 unsigned short protocol;
178 unsigned int *auth_flav_len;
179 rpc_authflavor_t *auth_flavs;
183 extern int nfs_mount(struct nfs_mount_request *info);
184 extern void nfs_umount(const struct nfs_mount_request *info);
187 extern const struct rpc_program nfs_program;
188 extern void nfs_clients_init(struct net *net);
189 extern void nfs_clients_exit(struct net *net);
190 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
191 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
192 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
193 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
194 void nfs_server_insert_lists(struct nfs_server *);
195 void nfs_server_remove_lists(struct nfs_server *);
196 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
197 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
199 struct nfs_server *nfs_alloc_server(void);
200 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
202 extern void nfs_put_client(struct nfs_client *);
203 extern void nfs_free_client(struct nfs_client *);
204 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
205 extern struct nfs_client *
206 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
207 struct nfs4_sessionid *, u32);
208 extern struct nfs_server *nfs_create_server(struct fs_context *);
209 extern struct nfs_server *nfs4_create_server(struct fs_context *);
210 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
211 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
212 struct sockaddr *sap, size_t salen,
214 extern void nfs_free_server(struct nfs_server *server);
215 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
219 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
220 extern int nfs_client_init_status(const struct nfs_client *clp);
221 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
222 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
223 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
224 const struct sockaddr *ds_addr,
225 int ds_addrlen, int ds_proto,
226 unsigned int ds_timeo,
227 unsigned int ds_retrans,
229 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
231 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
232 const struct sockaddr *ds_addr, int ds_addrlen,
233 int ds_proto, unsigned int ds_timeo,
234 unsigned int ds_retrans);
235 #ifdef CONFIG_PROC_FS
236 extern int __init nfs_fs_proc_init(void);
237 extern void nfs_fs_proc_exit(void);
238 extern int nfs_fs_proc_net_init(struct net *net);
239 extern void nfs_fs_proc_net_exit(struct net *net);
241 static inline int nfs_fs_proc_net_init(struct net *net)
245 static inline void nfs_fs_proc_net_exit(struct net *net)
248 static inline int nfs_fs_proc_init(void)
252 static inline void nfs_fs_proc_exit(void)
258 extern const struct svc_version nfs4_callback_version1;
259 extern const struct svc_version nfs4_callback_version4;
262 extern struct file_system_type nfs_fs_type;
265 extern int __init nfs_init_nfspagecache(void);
266 extern void nfs_destroy_nfspagecache(void);
267 extern int __init nfs_init_readpagecache(void);
268 extern void nfs_destroy_readpagecache(void);
269 extern int __init nfs_init_writepagecache(void);
270 extern void nfs_destroy_writepagecache(void);
272 extern int __init nfs_init_directcache(void);
273 extern void nfs_destroy_directcache(void);
274 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
275 struct nfs_pgio_header *hdr,
276 void (*release)(struct nfs_pgio_header *hdr));
277 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
278 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
280 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
281 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
282 void nfs_pgio_header_free(struct nfs_pgio_header *);
283 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
284 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
285 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
286 const struct rpc_call_ops *call_ops, int how, int flags);
287 void nfs_free_request(struct nfs_page *req);
288 struct nfs_pgio_mirror *
289 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
291 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
292 const struct nfs_open_context *ctx2)
294 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
298 extern const struct rpc_procinfo nfs_procedures[];
299 extern int nfs2_decode_dirent(struct xdr_stream *,
300 struct nfs_entry *, bool);
303 extern const struct rpc_procinfo nfs3_procedures[];
304 extern int nfs3_decode_dirent(struct xdr_stream *,
305 struct nfs_entry *, bool);
308 #if IS_ENABLED(CONFIG_NFS_V4)
309 extern int nfs4_decode_dirent(struct xdr_stream *,
310 struct nfs_entry *, bool);
312 #ifdef CONFIG_NFS_V4_1
313 extern const u32 nfs41_maxread_overhead;
314 extern const u32 nfs41_maxwrite_overhead;
315 extern const u32 nfs41_maxgetdevinfo_overhead;
319 #if IS_ENABLED(CONFIG_NFS_V4)
320 extern const struct rpc_procinfo nfs4_procedures[];
323 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
324 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
325 static inline struct nfs4_label *
326 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
331 if (src->len > NFS4_MAXLABELLEN)
337 memcpy(dst->label, src->label, src->len);
341 static inline void nfs4_label_free(struct nfs4_label *label)
350 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
352 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
353 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
356 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
357 static inline void nfs4_label_free(void *label) {}
358 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
361 static inline struct nfs4_label *
362 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
366 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
369 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
370 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
371 const struct nfs_client_initdata *);
374 extern void nfs_advise_use_readdirplus(struct inode *dir);
375 extern void nfs_force_use_readdirplus(struct inode *dir);
376 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
377 struct shrink_control *sc);
378 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
379 struct shrink_control *sc);
380 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
381 int nfs_create(struct user_namespace *, struct inode *, struct dentry *,
383 int nfs_mkdir(struct user_namespace *, struct inode *, struct dentry *,
385 int nfs_rmdir(struct inode *, struct dentry *);
386 int nfs_unlink(struct inode *, struct dentry *);
387 int nfs_symlink(struct user_namespace *, struct inode *, struct dentry *,
389 int nfs_link(struct dentry *, struct inode *, struct dentry *);
390 int nfs_mknod(struct user_namespace *, struct inode *, struct dentry *, umode_t,
392 int nfs_rename(struct user_namespace *, struct inode *, struct dentry *,
393 struct inode *, struct dentry *, unsigned int);
396 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
397 loff_t nfs_file_llseek(struct file *, loff_t, int);
398 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
399 int nfs_file_mmap(struct file *, struct vm_area_struct *);
400 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
401 int nfs_file_release(struct inode *, struct file *);
402 int nfs_lock(struct file *, int, struct file_lock *);
403 int nfs_flock(struct file *, int, struct file_lock *);
404 int nfs_check_flags(int);
407 extern struct workqueue_struct *nfsiod_workqueue;
408 extern struct inode *nfs_alloc_inode(struct super_block *sb);
409 extern void nfs_free_inode(struct inode *);
410 extern int nfs_write_inode(struct inode *, struct writeback_control *);
411 extern int nfs_drop_inode(struct inode *);
412 extern void nfs_clear_inode(struct inode *);
413 extern void nfs_evict_inode(struct inode *);
414 void nfs_zap_acl_cache(struct inode *inode);
415 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
416 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
417 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
420 extern const struct super_operations nfs_sops;
421 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
422 int nfs_try_get_tree(struct fs_context *);
423 int nfs_get_tree_common(struct fs_context *);
424 void nfs_kill_super(struct super_block *);
426 extern struct rpc_stat nfs_rpcstat;
428 extern int __init register_nfs_fs(void);
429 extern void __exit unregister_nfs_fs(void);
430 extern bool nfs_sb_active(struct super_block *sb);
431 extern void nfs_sb_deactive(struct super_block *sb);
432 extern int nfs_client_for_each_server(struct nfs_client *clp,
433 int (*fn)(struct nfs_server *, void *),
436 extern void nfs_start_io_read(struct inode *inode);
437 extern void nfs_end_io_read(struct inode *inode);
438 extern void nfs_start_io_write(struct inode *inode);
439 extern void nfs_end_io_write(struct inode *inode);
440 extern void nfs_start_io_direct(struct inode *inode);
441 extern void nfs_end_io_direct(struct inode *inode);
443 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
445 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
449 #define NFS_PATH_CANONICAL 1
450 extern char *nfs_path(char **p, struct dentry *dentry,
451 char *buffer, ssize_t buflen, unsigned flags);
452 extern struct vfsmount *nfs_d_automount(struct path *path);
453 int nfs_submount(struct fs_context *, struct nfs_server *);
454 int nfs_do_submount(struct fs_context *);
457 extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
458 #if IS_ENABLED(CONFIG_NFS_V4)
459 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
462 struct nfs_pgio_completion_ops;
464 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
465 struct inode *inode, bool force_mds,
466 const struct nfs_pgio_completion_ops *compl_ops);
467 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
468 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
471 void nfs_umount_begin(struct super_block *);
472 int nfs_statfs(struct dentry *, struct kstatfs *);
473 int nfs_show_options(struct seq_file *, struct dentry *);
474 int nfs_show_devname(struct seq_file *, struct dentry *);
475 int nfs_show_path(struct seq_file *, struct dentry *);
476 int nfs_show_stats(struct seq_file *, struct dentry *);
477 int nfs_reconfigure(struct fs_context *);
480 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
481 struct inode *inode, int ioflags, bool force_mds,
482 const struct nfs_pgio_completion_ops *compl_ops);
483 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
484 extern void nfs_commit_free(struct nfs_commit_data *p);
485 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
486 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
487 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
488 struct nfs_commit_data *data,
489 const struct nfs_rpc_ops *nfs_ops,
490 const struct rpc_call_ops *call_ops,
492 extern void nfs_init_commit(struct nfs_commit_data *data,
493 struct list_head *head,
494 struct pnfs_layout_segment *lseg,
495 struct nfs_commit_info *cinfo);
496 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
497 struct nfs_commit_info *cinfo, int max);
498 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
499 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
500 struct nfs_commit_info *cinfo);
501 void nfs_mark_request_commit(struct nfs_page *req,
502 struct pnfs_layout_segment *lseg,
503 struct nfs_commit_info *cinfo,
505 int nfs_write_need_commit(struct nfs_pgio_header *);
506 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
507 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
508 int how, struct nfs_commit_info *cinfo);
509 void nfs_retry_commit(struct list_head *page_list,
510 struct pnfs_layout_segment *lseg,
511 struct nfs_commit_info *cinfo,
513 void nfs_commitdata_release(struct nfs_commit_data *data);
514 void nfs_request_add_commit_list(struct nfs_page *req,
515 struct nfs_commit_info *cinfo);
516 void nfs_request_add_commit_list_locked(struct nfs_page *req,
517 struct list_head *dst,
518 struct nfs_commit_info *cinfo);
519 void nfs_request_remove_commit_list(struct nfs_page *req,
520 struct nfs_commit_info *cinfo);
521 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
523 struct nfs_direct_req *dreq);
524 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
525 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
526 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
528 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
529 loff_t lstart, loff_t lend);
531 #ifdef CONFIG_NFS_V4_1
533 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
534 unsigned int nbuckets)
538 for (i = 0; i < nbuckets; i++)
539 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
542 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
544 struct pnfs_commit_array *array;
547 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
548 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
554 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
559 #ifdef CONFIG_MIGRATION
560 extern int nfs_migrate_page(struct address_space *,
561 struct page *, struct page *, enum migrate_mode);
565 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
566 const struct nfs_write_verifier *v2)
568 return memcmp(v1->data, v2->data, sizeof(v1->data));
572 nfs_write_match_verf(const struct nfs_writeverf *verf,
573 struct nfs_page *req)
575 return verf->committed > NFS_UNSTABLE &&
576 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
580 extern struct rpc_task *
581 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
582 struct dentry *old_dentry, struct dentry *new_dentry,
583 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
584 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
587 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
588 struct nfs_direct_req *dreq);
589 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
592 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
593 const struct nfs_client_initdata *);
594 extern int nfs40_walk_client_list(struct nfs_client *clp,
595 struct nfs_client **result,
596 const struct cred *cred);
597 extern int nfs41_walk_client_list(struct nfs_client *clp,
598 struct nfs_client **result,
599 const struct cred *cred);
600 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
601 struct rpc_xprt *xprt,
604 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
606 struct super_block *sb = inode->i_sb;
608 if (sb && nfs_sb_active(sb)) {
616 static inline void nfs_iput_and_deactive(struct inode *inode)
619 struct super_block *sb = inode->i_sb;
627 * Determine the device name as a string
629 static inline char *nfs_devname(struct dentry *dentry,
630 char *buffer, ssize_t buflen)
633 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
637 * Determine the actual block size (and log2 thereof)
640 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
642 /* make sure blocksize is a power of two */
643 if ((bsize & (bsize - 1)) || nrbitsp) {
644 unsigned char nrbits;
646 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
657 * Calculate the number of 512byte blocks used.
659 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
661 blkcnt_t used = (tsize + 511) >> 9;
662 return (used > ULONG_MAX) ? ULONG_MAX : used;
666 * Compute and set NFS server blocksize
669 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
671 if (bsize < NFS_MIN_FILE_IO_SIZE)
672 bsize = NFS_DEF_FILE_IO_SIZE;
673 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
674 bsize = NFS_MAX_FILE_IO_SIZE;
676 return nfs_block_bits(bsize, nrbitsp);
680 * Determine the maximum file size for a superblock
683 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
685 sb->s_maxbytes = (loff_t)maxfilesize;
686 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
687 sb->s_maxbytes = MAX_LFS_FILESIZE;
691 * Record the page as unstable (an extra writeback period) and mark its
695 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
698 struct inode *inode = page_file_mapping(page)->host;
700 /* This page is really still in write-back - just that the
701 * writeback is happening on the server now.
703 inc_node_page_state(page, NR_WRITEBACK);
704 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
705 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
710 * Determine the number of bytes of data the page contains
713 unsigned int nfs_page_length(struct page *page)
715 loff_t i_size = i_size_read(page_file_mapping(page)->host);
718 pgoff_t index = page_index(page);
719 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
720 if (index < end_index)
722 if (index == end_index)
723 return ((i_size - 1) & ~PAGE_MASK) + 1;
729 * Convert a umode to a dirent->d_type
732 unsigned char nfs_umode_to_dtype(umode_t mode)
734 return (mode >> 12) & 15;
738 * Determine the number of pages in an array of length 'len' and
739 * with a base offset of 'base'
742 unsigned int nfs_page_array_len(unsigned int base, size_t len)
744 return ((unsigned long)len + (unsigned long)base +
745 PAGE_SIZE - 1) >> PAGE_SHIFT;
749 * Convert a struct timespec64 into a 64-bit change attribute
751 * This does approximately the same thing as timespec64_to_ns(),
752 * but for calculation efficiency, we multiply the seconds by
756 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
758 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
763 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
764 * @fh - pointer to filehandle
766 * returns a crc32 hash for the filehandle that is compatible with
767 * the one displayed by "wireshark".
769 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
771 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
773 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
775 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
776 NFS4_STATEID_OTHER_SIZE);
779 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
783 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
789 static inline bool nfs_error_is_fatal(int err)
810 static inline bool nfs_error_is_fatal_on_server(int err)
818 return nfs_error_is_fatal(err);
822 * Select between a default port value and a user-specified port value.
823 * If a zero value is set, then autobind will be used.
825 static inline void nfs_set_port(struct sockaddr *sap, int *port,
826 const unsigned short default_port)
828 if (*port == NFS_UNSPEC_PORT)
829 *port = default_port;
831 rpc_set_port(sap, *port);