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)
45 static inline fmode_t flags_to_mode(int flags)
47 fmode_t res = (__force fmode_t)flags & FMODE_EXEC;
48 if ((flags & O_ACCMODE) != O_WRONLY)
50 if ((flags & O_ACCMODE) != O_RDONLY)
56 * Note: RFC 1813 doesn't limit the number of auth flavors that
57 * a server can return, so make something up.
59 #define NFS_MAX_SECFLAVORS (12)
62 * Value used if the user did not specify a port value.
64 #define NFS_UNSPEC_PORT (-1)
66 #define NFS_UNSPEC_RETRANS (UINT_MAX)
67 #define NFS_UNSPEC_TIMEO (UINT_MAX)
70 * Maximum number of pages that readdir can use for creating
71 * a vmapped array of pages.
73 #define NFS_MAX_READDIR_PAGES 8
75 struct nfs_client_initdata {
76 unsigned long init_flags;
77 const char *hostname; /* Hostname of the server */
78 const struct sockaddr *addr; /* Address of the server */
79 const char *nodename; /* Hostname of the client */
80 const char *ip_addr; /* IP address of the client */
82 struct nfs_subversion *nfs_mod;
85 unsigned int nconnect;
87 const struct rpc_timeout *timeparms;
88 const struct cred *cred;
92 * In-kernel mount arguments
94 struct nfs_fs_context {
96 bool skip_reconfig_option_check;
99 unsigned int flags; /* NFS{,4}_MOUNT_* flags */
100 unsigned int rsize, wsize;
101 unsigned int timeo, retrans;
102 unsigned int acregmin, acregmax;
103 unsigned int acdirmin, acdirmax;
105 unsigned int options;
107 struct nfs_auth_info auth_info;
108 rpc_authflavor_t selected_flavor;
109 char *client_address;
110 unsigned int version;
111 unsigned int minorversion;
113 unsigned short protofamily;
114 unsigned short mountfamily;
118 struct sockaddr address;
119 struct sockaddr_storage _address;
125 unsigned short protocol;
130 struct sockaddr address;
131 struct sockaddr_storage _address;
137 unsigned short protocol;
138 unsigned short nconnect;
139 unsigned short export_path_len;
142 struct nfs_fh *mntfh;
143 struct nfs_server *server;
144 struct nfs_subversion *nfs_mod;
146 /* Information for a cloned mount. */
147 struct nfs_clone_mount {
148 struct super_block *sb;
149 struct dentry *dentry;
150 struct nfs_fattr *fattr;
151 unsigned int inherited_bsize;
155 #define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \
156 errorf(fc, fmt, ## __VA_ARGS__) : \
157 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
159 #define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \
160 errorf(fc, fmt, ## __VA_ARGS__) : \
161 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
163 #define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \
164 invalf(fc, fmt, ## __VA_ARGS__) : \
165 ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; }))
167 #define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \
168 invalf(fc, fmt, ## __VA_ARGS__) : \
169 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; }))
171 #define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \
172 warnf(fc, fmt, ## __VA_ARGS__) : \
173 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
175 #define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \
176 warnf(fc, fmt, ## __VA_ARGS__) : \
177 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
179 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
181 return fc->fs_private;
185 struct nfs_mount_request {
186 struct sockaddr *sap;
191 unsigned short protocol;
194 unsigned int *auth_flav_len;
195 rpc_authflavor_t *auth_flavs;
199 extern int nfs_mount(struct nfs_mount_request *info);
200 extern void nfs_umount(const struct nfs_mount_request *info);
203 extern const struct rpc_program nfs_program;
204 extern void nfs_clients_init(struct net *net);
205 extern void nfs_clients_exit(struct net *net);
206 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
207 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
208 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
209 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
210 void nfs_server_insert_lists(struct nfs_server *);
211 void nfs_server_remove_lists(struct nfs_server *);
212 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
213 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
215 struct nfs_server *nfs_alloc_server(void);
216 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
218 extern void nfs_put_client(struct nfs_client *);
219 extern void nfs_free_client(struct nfs_client *);
220 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
221 extern struct nfs_client *
222 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
223 struct nfs4_sessionid *, u32);
224 extern struct nfs_server *nfs_create_server(struct fs_context *);
225 extern struct nfs_server *nfs4_create_server(struct fs_context *);
226 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
227 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
228 struct sockaddr *sap, size_t salen,
230 extern void nfs_free_server(struct nfs_server *server);
231 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
235 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
236 extern int nfs_client_init_status(const struct nfs_client *clp);
237 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
238 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
239 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
240 const struct sockaddr *ds_addr,
241 int ds_addrlen, int ds_proto,
242 unsigned int ds_timeo,
243 unsigned int ds_retrans,
245 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
247 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
248 const struct sockaddr *ds_addr, int ds_addrlen,
249 int ds_proto, unsigned int ds_timeo,
250 unsigned int ds_retrans);
251 #ifdef CONFIG_PROC_FS
252 extern int __init nfs_fs_proc_init(void);
253 extern void nfs_fs_proc_exit(void);
254 extern int nfs_fs_proc_net_init(struct net *net);
255 extern void nfs_fs_proc_net_exit(struct net *net);
257 static inline int nfs_fs_proc_net_init(struct net *net)
261 static inline void nfs_fs_proc_net_exit(struct net *net)
264 static inline int nfs_fs_proc_init(void)
268 static inline void nfs_fs_proc_exit(void)
274 extern const struct svc_version nfs4_callback_version1;
275 extern const struct svc_version nfs4_callback_version4;
278 extern struct file_system_type nfs_fs_type;
281 extern int __init nfs_init_nfspagecache(void);
282 extern void nfs_destroy_nfspagecache(void);
283 extern int __init nfs_init_readpagecache(void);
284 extern void nfs_destroy_readpagecache(void);
285 extern int __init nfs_init_writepagecache(void);
286 extern void nfs_destroy_writepagecache(void);
288 extern int __init nfs_init_directcache(void);
289 extern void nfs_destroy_directcache(void);
290 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
291 struct nfs_pgio_header *hdr,
292 void (*release)(struct nfs_pgio_header *hdr));
293 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
294 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
296 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
297 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
298 void nfs_pgio_header_free(struct nfs_pgio_header *);
299 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
300 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
301 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
302 const struct rpc_call_ops *call_ops, int how, int flags);
303 void nfs_free_request(struct nfs_page *req);
304 struct nfs_pgio_mirror *
305 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
307 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
308 const struct nfs_open_context *ctx2)
310 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
314 extern const struct rpc_procinfo nfs_procedures[];
315 extern int nfs2_decode_dirent(struct xdr_stream *,
316 struct nfs_entry *, bool);
319 extern const struct rpc_procinfo nfs3_procedures[];
320 extern int nfs3_decode_dirent(struct xdr_stream *,
321 struct nfs_entry *, bool);
324 #if IS_ENABLED(CONFIG_NFS_V4)
325 extern int nfs4_decode_dirent(struct xdr_stream *,
326 struct nfs_entry *, bool);
328 #ifdef CONFIG_NFS_V4_1
329 extern const u32 nfs41_maxread_overhead;
330 extern const u32 nfs41_maxwrite_overhead;
331 extern const u32 nfs41_maxgetdevinfo_overhead;
335 #if IS_ENABLED(CONFIG_NFS_V4)
336 extern const struct rpc_procinfo nfs4_procedures[];
339 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
340 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
341 static inline struct nfs4_label *
342 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
347 if (src->len > NFS4_MAXLABELLEN)
353 memcpy(dst->label, src->label, src->len);
357 static inline void nfs4_label_free(struct nfs4_label *label)
366 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
368 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
369 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
372 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
373 static inline void nfs4_label_free(void *label) {}
374 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
377 static inline struct nfs4_label *
378 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
382 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
385 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
386 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
387 const struct nfs_client_initdata *);
390 extern void nfs_advise_use_readdirplus(struct inode *dir);
391 extern void nfs_force_use_readdirplus(struct inode *dir);
392 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
393 struct shrink_control *sc);
394 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
395 struct shrink_control *sc);
396 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
397 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
398 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
399 int nfs_rmdir(struct inode *, struct dentry *);
400 int nfs_unlink(struct inode *, struct dentry *);
401 int nfs_symlink(struct inode *, struct dentry *, const char *);
402 int nfs_link(struct dentry *, struct inode *, struct dentry *);
403 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
404 int nfs_rename(struct inode *, struct dentry *,
405 struct inode *, struct dentry *, unsigned int);
408 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
409 loff_t nfs_file_llseek(struct file *, loff_t, int);
410 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
411 int nfs_file_mmap(struct file *, struct vm_area_struct *);
412 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
413 int nfs_file_release(struct inode *, struct file *);
414 int nfs_lock(struct file *, int, struct file_lock *);
415 int nfs_flock(struct file *, int, struct file_lock *);
416 int nfs_check_flags(int);
419 extern struct workqueue_struct *nfsiod_workqueue;
420 extern struct inode *nfs_alloc_inode(struct super_block *sb);
421 extern void nfs_free_inode(struct inode *);
422 extern int nfs_write_inode(struct inode *, struct writeback_control *);
423 extern int nfs_drop_inode(struct inode *);
424 extern void nfs_clear_inode(struct inode *);
425 extern void nfs_evict_inode(struct inode *);
426 void nfs_zap_acl_cache(struct inode *inode);
427 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
428 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
429 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
432 extern const struct super_operations nfs_sops;
433 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
434 int nfs_try_get_tree(struct fs_context *);
435 int nfs_get_tree_common(struct fs_context *);
436 void nfs_kill_super(struct super_block *);
438 extern int __init register_nfs_fs(void);
439 extern void __exit unregister_nfs_fs(void);
440 extern bool nfs_sb_active(struct super_block *sb);
441 extern void nfs_sb_deactive(struct super_block *sb);
442 extern int nfs_client_for_each_server(struct nfs_client *clp,
443 int (*fn)(struct nfs_server *, void *),
446 extern void nfs_start_io_read(struct inode *inode);
447 extern void nfs_end_io_read(struct inode *inode);
448 extern void nfs_start_io_write(struct inode *inode);
449 extern void nfs_end_io_write(struct inode *inode);
450 extern void nfs_start_io_direct(struct inode *inode);
451 extern void nfs_end_io_direct(struct inode *inode);
453 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
455 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
459 #define NFS_PATH_CANONICAL 1
460 extern char *nfs_path(char **p, struct dentry *dentry,
461 char *buffer, ssize_t buflen, unsigned flags);
462 extern struct vfsmount *nfs_d_automount(struct path *path);
463 int nfs_submount(struct fs_context *, struct nfs_server *);
464 int nfs_do_submount(struct fs_context *);
467 extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
468 #if IS_ENABLED(CONFIG_NFS_V4)
469 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
472 struct nfs_pgio_completion_ops;
474 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
475 struct inode *inode, bool force_mds,
476 const struct nfs_pgio_completion_ops *compl_ops);
477 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
478 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
481 void nfs_umount_begin(struct super_block *);
482 int nfs_statfs(struct dentry *, struct kstatfs *);
483 int nfs_show_options(struct seq_file *, struct dentry *);
484 int nfs_show_devname(struct seq_file *, struct dentry *);
485 int nfs_show_path(struct seq_file *, struct dentry *);
486 int nfs_show_stats(struct seq_file *, struct dentry *);
487 int nfs_reconfigure(struct fs_context *);
490 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
491 struct inode *inode, int ioflags, bool force_mds,
492 const struct nfs_pgio_completion_ops *compl_ops);
493 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
494 extern void nfs_commit_free(struct nfs_commit_data *p);
495 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
496 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
497 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
498 struct nfs_commit_data *data,
499 const struct nfs_rpc_ops *nfs_ops,
500 const struct rpc_call_ops *call_ops,
502 extern void nfs_init_commit(struct nfs_commit_data *data,
503 struct list_head *head,
504 struct pnfs_layout_segment *lseg,
505 struct nfs_commit_info *cinfo);
506 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
507 struct nfs_commit_info *cinfo, int max);
508 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
509 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
510 struct nfs_commit_info *cinfo);
511 void nfs_mark_request_commit(struct nfs_page *req,
512 struct pnfs_layout_segment *lseg,
513 struct nfs_commit_info *cinfo,
515 int nfs_write_need_commit(struct nfs_pgio_header *);
516 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
517 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
518 int how, struct nfs_commit_info *cinfo);
519 void nfs_retry_commit(struct list_head *page_list,
520 struct pnfs_layout_segment *lseg,
521 struct nfs_commit_info *cinfo,
523 void nfs_commitdata_release(struct nfs_commit_data *data);
524 void nfs_request_add_commit_list(struct nfs_page *req,
525 struct nfs_commit_info *cinfo);
526 void nfs_request_add_commit_list_locked(struct nfs_page *req,
527 struct list_head *dst,
528 struct nfs_commit_info *cinfo);
529 void nfs_request_remove_commit_list(struct nfs_page *req,
530 struct nfs_commit_info *cinfo);
531 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
533 struct nfs_direct_req *dreq);
534 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
535 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
536 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
538 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
539 loff_t lstart, loff_t lend);
541 #ifdef CONFIG_NFS_V4_1
543 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
544 unsigned int nbuckets)
548 for (i = 0; i < nbuckets; i++)
549 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
552 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
554 struct pnfs_commit_array *array;
557 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
558 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
564 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
569 #ifdef CONFIG_MIGRATION
570 extern int nfs_migrate_page(struct address_space *,
571 struct page *, struct page *, enum migrate_mode);
575 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
576 const struct nfs_write_verifier *v2)
578 return memcmp(v1->data, v2->data, sizeof(v1->data));
582 nfs_write_match_verf(const struct nfs_writeverf *verf,
583 struct nfs_page *req)
585 return verf->committed > NFS_UNSTABLE &&
586 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
589 static inline gfp_t nfs_io_gfp_mask(void)
591 if (current->flags & PF_WQ_WORKER)
592 return GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
597 extern struct rpc_task *
598 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
599 struct dentry *old_dentry, struct dentry *new_dentry,
600 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
601 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
604 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
605 struct nfs_direct_req *dreq);
606 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
609 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
610 const struct nfs_client_initdata *);
611 extern int nfs40_walk_client_list(struct nfs_client *clp,
612 struct nfs_client **result,
613 const struct cred *cred);
614 extern int nfs41_walk_client_list(struct nfs_client *clp,
615 struct nfs_client **result,
616 const struct cred *cred);
617 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
618 struct rpc_xprt *xprt,
621 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
623 struct super_block *sb = inode->i_sb;
625 if (sb && nfs_sb_active(sb)) {
633 static inline void nfs_iput_and_deactive(struct inode *inode)
636 struct super_block *sb = inode->i_sb;
644 * Determine the device name as a string
646 static inline char *nfs_devname(struct dentry *dentry,
647 char *buffer, ssize_t buflen)
650 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
654 * Determine the actual block size (and log2 thereof)
657 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
659 /* make sure blocksize is a power of two */
660 if ((bsize & (bsize - 1)) || nrbitsp) {
661 unsigned char nrbits;
663 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
674 * Calculate the number of 512byte blocks used.
676 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
678 blkcnt_t used = (tsize + 511) >> 9;
679 return (used > ULONG_MAX) ? ULONG_MAX : used;
683 * Compute and set NFS server blocksize
686 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
688 if (bsize < NFS_MIN_FILE_IO_SIZE)
689 bsize = NFS_DEF_FILE_IO_SIZE;
690 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
691 bsize = NFS_MAX_FILE_IO_SIZE;
693 return nfs_block_bits(bsize, nrbitsp);
697 * Determine the maximum file size for a superblock
700 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
702 sb->s_maxbytes = (loff_t)maxfilesize;
703 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
704 sb->s_maxbytes = MAX_LFS_FILESIZE;
708 * Record the page as unstable (an extra writeback period) and mark its
712 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
715 struct inode *inode = page_file_mapping(page)->host;
717 /* This page is really still in write-back - just that the
718 * writeback is happening on the server now.
720 inc_node_page_state(page, NR_WRITEBACK);
721 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
722 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
727 * Determine the number of bytes of data the page contains
730 unsigned int nfs_page_length(struct page *page)
732 loff_t i_size = i_size_read(page_file_mapping(page)->host);
735 pgoff_t index = page_index(page);
736 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
737 if (index < end_index)
739 if (index == end_index)
740 return ((i_size - 1) & ~PAGE_MASK) + 1;
746 * Convert a umode to a dirent->d_type
749 unsigned char nfs_umode_to_dtype(umode_t mode)
751 return (mode >> 12) & 15;
755 * Determine the number of pages in an array of length 'len' and
756 * with a base offset of 'base'
759 unsigned int nfs_page_array_len(unsigned int base, size_t len)
761 return ((unsigned long)len + (unsigned long)base +
762 PAGE_SIZE - 1) >> PAGE_SHIFT;
766 * Convert a struct timespec64 into a 64-bit change attribute
768 * This does approximately the same thing as timespec64_to_ns(),
769 * but for calculation efficiency, we multiply the seconds by
773 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
775 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
780 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
781 * @fh - pointer to filehandle
783 * returns a crc32 hash for the filehandle that is compatible with
784 * the one displayed by "wireshark".
786 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
788 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
790 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
792 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
793 NFS4_STATEID_OTHER_SIZE);
796 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
800 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
806 static inline bool nfs_error_is_fatal(int err)
827 static inline bool nfs_error_is_fatal_on_server(int err)
836 return nfs_error_is_fatal(err);
840 * Select between a default port value and a user-specified port value.
841 * If a zero value is set, then autobind will be used.
843 static inline void nfs_set_port(struct sockaddr *sap, int *port,
844 const unsigned short default_port)
846 if (*port == NFS_UNSPEC_PORT)
847 *port = default_port;
849 rpc_set_port(sap, *port);