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1/*
2 * NFS internal definitions
3 */
4
5#include "nfs4_fs.h"
6#include <linux/mount.h>
7#include <linux/security.h>
8#include <linux/crc32.h>
9#include <linux/nfs_page.h>
10
11#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
12
13struct nfs_string;
14
15/* Maximum number of readahead requests
16 * FIXME: this should really be a sysctl so that users may tune it to suit
17 * their needs. People that do NFS over a slow network, might for
18 * instance want to reduce it to something closer to 1 for improved
19 * interactive response.
20 */
21#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
22
23static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
24{
25 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
26 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
27}
28
29static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
30{
31 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
32 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
33 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
34 return 0;
35 return 1;
36}
37
38struct nfs_clone_mount {
39 const struct super_block *sb;
40 const struct dentry *dentry;
41 struct nfs_fh *fh;
42 struct nfs_fattr *fattr;
43 char *hostname;
44 char *mnt_path;
45 struct sockaddr *addr;
46 size_t addrlen;
47 rpc_authflavor_t authflavor;
48};
49
50/*
51 * Note: RFC 1813 doesn't limit the number of auth flavors that
52 * a server can return, so make something up.
53 */
54#define NFS_MAX_SECFLAVORS (12)
55
56/*
57 * Value used if the user did not specify a port value.
58 */
59#define NFS_UNSPEC_PORT (-1)
60
61/*
62 * Maximum number of pages that readdir can use for creating
63 * a vmapped array of pages.
64 */
65#define NFS_MAX_READDIR_PAGES 8
66
67struct nfs_client_initdata {
68 unsigned long init_flags;
69 const char *hostname;
70 const struct sockaddr *addr;
71 size_t addrlen;
72 struct nfs_subversion *nfs_mod;
73 int proto;
74 u32 minorversion;
75 struct net *net;
76};
77
78/*
79 * In-kernel mount arguments
80 */
81struct nfs_parsed_mount_data {
82 int flags;
83 unsigned int rsize, wsize;
84 unsigned int timeo, retrans;
85 unsigned int acregmin, acregmax,
86 acdirmin, acdirmax;
87 unsigned int namlen;
88 unsigned int options;
89 unsigned int bsize;
90 struct nfs_auth_info auth_info;
91 rpc_authflavor_t selected_flavor;
92 char *client_address;
93 unsigned int version;
94 unsigned int minorversion;
95 char *fscache_uniq;
96 bool need_mount;
97
98 struct {
99 struct sockaddr_storage address;
100 size_t addrlen;
101 char *hostname;
102 u32 version;
103 int port;
104 unsigned short protocol;
105 } mount_server;
106
107 struct {
108 struct sockaddr_storage address;
109 size_t addrlen;
110 char *hostname;
111 char *export_path;
112 int port;
113 unsigned short protocol;
114 } nfs_server;
115
116 struct security_mnt_opts lsm_opts;
117 struct net *net;
118};
119
120/* mount_clnt.c */
121struct nfs_mount_request {
122 struct sockaddr *sap;
123 size_t salen;
124 char *hostname;
125 char *dirpath;
126 u32 version;
127 unsigned short protocol;
128 struct nfs_fh *fh;
129 int noresvport;
130 unsigned int *auth_flav_len;
131 rpc_authflavor_t *auth_flavs;
132 struct net *net;
133};
134
135struct nfs_mount_info {
136 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
137 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
138 struct nfs_parsed_mount_data *parsed;
139 struct nfs_clone_mount *cloned;
140 struct nfs_fh *mntfh;
141};
142
143extern int nfs_mount(struct nfs_mount_request *info);
144extern void nfs_umount(const struct nfs_mount_request *info);
145
146/* client.c */
147extern const struct rpc_program nfs_program;
148extern void nfs_clients_init(struct net *net);
149extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
150int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
151struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
152 const struct rpc_timeout *, const char *,
153 rpc_authflavor_t);
154int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
155void nfs_server_insert_lists(struct nfs_server *);
156void nfs_server_remove_lists(struct nfs_server *);
157void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
158int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
159 rpc_authflavor_t);
160struct nfs_server *nfs_alloc_server(void);
161void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
162
163extern void nfs_cleanup_cb_ident_idr(struct net *);
164extern void nfs_put_client(struct nfs_client *);
165extern void nfs_free_client(struct nfs_client *);
166extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
167extern struct nfs_client *
168nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
169 struct nfs4_sessionid *, u32);
170extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
171 struct nfs_subversion *);
172extern struct nfs_server *nfs4_create_server(
173 struct nfs_mount_info *,
174 struct nfs_subversion *);
175extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
176 struct nfs_fh *);
177extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
178 struct sockaddr *sap, size_t salen,
179 struct net *net);
180extern void nfs_free_server(struct nfs_server *server);
181extern struct nfs_server *nfs_clone_server(struct nfs_server *,
182 struct nfs_fh *,
183 struct nfs_fattr *,
184 rpc_authflavor_t);
185extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
186extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
187extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
188 const struct sockaddr *ds_addr,
189 int ds_addrlen, int ds_proto,
190 unsigned int ds_timeo,
191 unsigned int ds_retrans,
192 u32 minor_version,
193 rpc_authflavor_t au_flavor);
194extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
195 struct inode *);
196extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp,
197 const struct sockaddr *ds_addr, int ds_addrlen,
198 int ds_proto, unsigned int ds_timeo,
199 unsigned int ds_retrans, rpc_authflavor_t au_flavor);
200#ifdef CONFIG_PROC_FS
201extern int __init nfs_fs_proc_init(void);
202extern void nfs_fs_proc_exit(void);
203extern int nfs_fs_proc_net_init(struct net *net);
204extern void nfs_fs_proc_net_exit(struct net *net);
205#else
206static inline int nfs_fs_proc_net_init(struct net *net)
207{
208 return 0;
209}
210static inline void nfs_fs_proc_net_exit(struct net *net)
211{
212}
213static inline int nfs_fs_proc_init(void)
214{
215 return 0;
216}
217static inline void nfs_fs_proc_exit(void)
218{
219}
220#endif
221
222/* callback_xdr.c */
223extern struct svc_version nfs4_callback_version1;
224extern struct svc_version nfs4_callback_version4;
225
226struct nfs_pageio_descriptor;
227/* pagelist.c */
228extern int __init nfs_init_nfspagecache(void);
229extern void nfs_destroy_nfspagecache(void);
230extern int __init nfs_init_readpagecache(void);
231extern void nfs_destroy_readpagecache(void);
232extern int __init nfs_init_writepagecache(void);
233extern void nfs_destroy_writepagecache(void);
234
235extern int __init nfs_init_directcache(void);
236extern void nfs_destroy_directcache(void);
237extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
238 struct nfs_pgio_header *hdr,
239 void (*release)(struct nfs_pgio_header *hdr));
240void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
241int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
242
243extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
244struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
245void nfs_pgio_header_free(struct nfs_pgio_header *);
246void nfs_pgio_data_destroy(struct nfs_pgio_header *);
247int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
248int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
249 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
250 const struct rpc_call_ops *call_ops, int how, int flags);
251void nfs_free_request(struct nfs_page *req);
252struct nfs_pgio_mirror *
253nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
254
255static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
256{
257 WARN_ON_ONCE(desc->pg_mirror_count < 1);
258 return desc->pg_mirror_count > 1;
259}
260
261static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
262 const struct nfs_open_context *ctx2)
263{
264 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
265}
266
267/* nfs2xdr.c */
268extern struct rpc_procinfo nfs_procedures[];
269extern int nfs2_decode_dirent(struct xdr_stream *,
270 struct nfs_entry *, int);
271
272/* nfs3xdr.c */
273extern struct rpc_procinfo nfs3_procedures[];
274extern int nfs3_decode_dirent(struct xdr_stream *,
275 struct nfs_entry *, int);
276
277/* nfs4xdr.c */
278#if IS_ENABLED(CONFIG_NFS_V4)
279extern int nfs4_decode_dirent(struct xdr_stream *,
280 struct nfs_entry *, int);
281#endif
282#ifdef CONFIG_NFS_V4_1
283extern const u32 nfs41_maxread_overhead;
284extern const u32 nfs41_maxwrite_overhead;
285extern const u32 nfs41_maxgetdevinfo_overhead;
286#endif
287
288/* nfs4proc.c */
289#if IS_ENABLED(CONFIG_NFS_V4)
290extern struct rpc_procinfo nfs4_procedures[];
291#endif
292
293#ifdef CONFIG_NFS_V4_SECURITY_LABEL
294extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
295static inline struct nfs4_label *
296nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
297{
298 if (!dst || !src)
299 return NULL;
300
301 if (src->len > NFS4_MAXLABELLEN)
302 return NULL;
303
304 dst->lfs = src->lfs;
305 dst->pi = src->pi;
306 dst->len = src->len;
307 memcpy(dst->label, src->label, src->len);
308
309 return dst;
310}
311static inline void nfs4_label_free(struct nfs4_label *label)
312{
313 if (label) {
314 kfree(label->label);
315 kfree(label);
316 }
317 return;
318}
319
320static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
321{
322 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
323 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
324}
325#else
326static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
327static inline void nfs4_label_free(void *label) {}
328static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
329{
330}
331static inline struct nfs4_label *
332nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
333{
334 return NULL;
335}
336#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
337
338/* proc.c */
339void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
340extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
341 const struct rpc_timeout *timeparms,
342 const char *ip_addr);
343
344/* dir.c */
345extern void nfs_force_use_readdirplus(struct inode *dir);
346extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
347 struct shrink_control *sc);
348extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
349 struct shrink_control *sc);
350struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
351int nfs_create(struct inode *, struct dentry *, umode_t, bool);
352int nfs_mkdir(struct inode *, struct dentry *, umode_t);
353int nfs_rmdir(struct inode *, struct dentry *);
354int nfs_unlink(struct inode *, struct dentry *);
355int nfs_symlink(struct inode *, struct dentry *, const char *);
356int nfs_link(struct dentry *, struct inode *, struct dentry *);
357int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
358int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
359
360/* file.c */
361int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
362loff_t nfs_file_llseek(struct file *, loff_t, int);
363ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
364ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
365 size_t, unsigned int);
366int nfs_file_mmap(struct file *, struct vm_area_struct *);
367ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
368int nfs_file_release(struct inode *, struct file *);
369int nfs_lock(struct file *, int, struct file_lock *);
370int nfs_flock(struct file *, int, struct file_lock *);
371int nfs_check_flags(int);
372
373/* inode.c */
374extern struct workqueue_struct *nfsiod_workqueue;
375extern struct inode *nfs_alloc_inode(struct super_block *sb);
376extern void nfs_destroy_inode(struct inode *);
377extern int nfs_write_inode(struct inode *, struct writeback_control *);
378extern int nfs_drop_inode(struct inode *);
379extern void nfs_clear_inode(struct inode *);
380extern void nfs_evict_inode(struct inode *);
381void nfs_zap_acl_cache(struct inode *inode);
382extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
383extern int nfs_wait_atomic_killable(atomic_t *p);
384
385/* super.c */
386extern const struct super_operations nfs_sops;
387extern struct file_system_type nfs_fs_type;
388extern struct file_system_type nfs_xdev_fs_type;
389#if IS_ENABLED(CONFIG_NFS_V4)
390extern struct file_system_type nfs4_xdev_fs_type;
391extern struct file_system_type nfs4_referral_fs_type;
392#endif
393bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
394struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
395 struct nfs_subversion *);
396void nfs_initialise_sb(struct super_block *);
397int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
398int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
399struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
400 struct nfs_mount_info *, struct nfs_subversion *);
401struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
402struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
403 const char *, struct nfs_mount_info *);
404void nfs_kill_super(struct super_block *);
405void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
406
407extern struct rpc_stat nfs_rpcstat;
408
409extern int __init register_nfs_fs(void);
410extern void __exit unregister_nfs_fs(void);
411extern bool nfs_sb_active(struct super_block *sb);
412extern void nfs_sb_deactive(struct super_block *sb);
413
414/* namespace.c */
415#define NFS_PATH_CANONICAL 1
416extern char *nfs_path(char **p, struct dentry *dentry,
417 char *buffer, ssize_t buflen, unsigned flags);
418extern struct vfsmount *nfs_d_automount(struct path *path);
419struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
420 struct nfs_fh *, struct nfs_fattr *);
421struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
422 struct nfs_fattr *, rpc_authflavor_t);
423
424/* getroot.c */
425extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
426 const char *);
427#if IS_ENABLED(CONFIG_NFS_V4)
428extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
429 const char *);
430
431extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
432#endif
433
434struct nfs_pgio_completion_ops;
435/* read.c */
436extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
437 struct inode *inode, bool force_mds,
438 const struct nfs_pgio_completion_ops *compl_ops);
439extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
440extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
441
442/* super.c */
443void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
444void nfs_umount_begin(struct super_block *);
445int nfs_statfs(struct dentry *, struct kstatfs *);
446int nfs_show_options(struct seq_file *, struct dentry *);
447int nfs_show_devname(struct seq_file *, struct dentry *);
448int nfs_show_path(struct seq_file *, struct dentry *);
449int nfs_show_stats(struct seq_file *, struct dentry *);
450int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
451
452/* write.c */
453extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
454 struct inode *inode, int ioflags, bool force_mds,
455 const struct nfs_pgio_completion_ops *compl_ops);
456extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
457extern void nfs_commit_free(struct nfs_commit_data *p);
458extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
459extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
460extern int nfs_initiate_commit(struct rpc_clnt *clnt,
461 struct nfs_commit_data *data,
462 const struct nfs_rpc_ops *nfs_ops,
463 const struct rpc_call_ops *call_ops,
464 int how, int flags);
465extern void nfs_init_commit(struct nfs_commit_data *data,
466 struct list_head *head,
467 struct pnfs_layout_segment *lseg,
468 struct nfs_commit_info *cinfo);
469int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
470 struct nfs_commit_info *cinfo, int max);
471unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
472int nfs_scan_commit(struct inode *inode, struct list_head *dst,
473 struct nfs_commit_info *cinfo);
474void nfs_mark_request_commit(struct nfs_page *req,
475 struct pnfs_layout_segment *lseg,
476 struct nfs_commit_info *cinfo,
477 u32 ds_commit_idx);
478int nfs_write_need_commit(struct nfs_pgio_header *);
479void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
480int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
481 int how, struct nfs_commit_info *cinfo);
482void nfs_retry_commit(struct list_head *page_list,
483 struct pnfs_layout_segment *lseg,
484 struct nfs_commit_info *cinfo,
485 u32 ds_commit_idx);
486void nfs_commitdata_release(struct nfs_commit_data *data);
487void nfs_request_add_commit_list(struct nfs_page *req,
488 struct nfs_commit_info *cinfo);
489void nfs_request_add_commit_list_locked(struct nfs_page *req,
490 struct list_head *dst,
491 struct nfs_commit_info *cinfo);
492void nfs_request_remove_commit_list(struct nfs_page *req,
493 struct nfs_commit_info *cinfo);
494void nfs_init_cinfo(struct nfs_commit_info *cinfo,
495 struct inode *inode,
496 struct nfs_direct_req *dreq);
497int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
498bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
499void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
500
501#ifdef CONFIG_MIGRATION
502extern int nfs_migrate_page(struct address_space *,
503 struct page *, struct page *, enum migrate_mode);
504#else
505#define nfs_migrate_page NULL
506#endif
507
508/* unlink.c */
509extern struct rpc_task *
510nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
511 struct dentry *old_dentry, struct dentry *new_dentry,
512 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
513extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
514
515/* direct.c */
516void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
517 struct nfs_direct_req *dreq);
518extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
519
520/* nfs4proc.c */
521extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
522extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
523 const struct rpc_timeout *timeparms,
524 const char *ip_addr);
525extern int nfs40_walk_client_list(struct nfs_client *clp,
526 struct nfs_client **result,
527 struct rpc_cred *cred);
528extern int nfs41_walk_client_list(struct nfs_client *clp,
529 struct nfs_client **result,
530 struct rpc_cred *cred);
531
532static inline struct inode *nfs_igrab_and_active(struct inode *inode)
533{
534 inode = igrab(inode);
535 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
536 iput(inode);
537 inode = NULL;
538 }
539 return inode;
540}
541
542static inline void nfs_iput_and_deactive(struct inode *inode)
543{
544 if (inode != NULL) {
545 struct super_block *sb = inode->i_sb;
546
547 iput(inode);
548 nfs_sb_deactive(sb);
549 }
550}
551
552/*
553 * Determine the device name as a string
554 */
555static inline char *nfs_devname(struct dentry *dentry,
556 char *buffer, ssize_t buflen)
557{
558 char *dummy;
559 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
560}
561
562/*
563 * Determine the actual block size (and log2 thereof)
564 */
565static inline
566unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
567{
568 /* make sure blocksize is a power of two */
569 if ((bsize & (bsize - 1)) || nrbitsp) {
570 unsigned char nrbits;
571
572 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
573 ;
574 bsize = 1 << nrbits;
575 if (nrbitsp)
576 *nrbitsp = nrbits;
577 }
578
579 return bsize;
580}
581
582/*
583 * Calculate the number of 512byte blocks used.
584 */
585static inline blkcnt_t nfs_calc_block_size(u64 tsize)
586{
587 blkcnt_t used = (tsize + 511) >> 9;
588 return (used > ULONG_MAX) ? ULONG_MAX : used;
589}
590
591/*
592 * Compute and set NFS server blocksize
593 */
594static inline
595unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
596{
597 if (bsize < NFS_MIN_FILE_IO_SIZE)
598 bsize = NFS_DEF_FILE_IO_SIZE;
599 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
600 bsize = NFS_MAX_FILE_IO_SIZE;
601
602 return nfs_block_bits(bsize, nrbitsp);
603}
604
605/*
606 * Determine the maximum file size for a superblock
607 */
608static inline
609void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
610{
611 sb->s_maxbytes = (loff_t)maxfilesize;
612 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
613 sb->s_maxbytes = MAX_LFS_FILESIZE;
614}
615
616/*
617 * Record the page as unstable and mark its inode as dirty.
618 */
619static inline
620void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
621{
622 if (!cinfo->dreq) {
623 struct inode *inode = page_file_mapping(page)->host;
624
625 inc_zone_page_state(page, NR_UNSTABLE_NFS);
626 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
627 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
628 }
629}
630
631/*
632 * Determine the number of bytes of data the page contains
633 */
634static inline
635unsigned int nfs_page_length(struct page *page)
636{
637 loff_t i_size = i_size_read(page_file_mapping(page)->host);
638
639 if (i_size > 0) {
640 pgoff_t page_index = page_file_index(page);
641 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
642 if (page_index < end_index)
643 return PAGE_SIZE;
644 if (page_index == end_index)
645 return ((i_size - 1) & ~PAGE_MASK) + 1;
646 }
647 return 0;
648}
649
650/*
651 * Convert a umode to a dirent->d_type
652 */
653static inline
654unsigned char nfs_umode_to_dtype(umode_t mode)
655{
656 return (mode >> 12) & 15;
657}
658
659/*
660 * Determine the number of pages in an array of length 'len' and
661 * with a base offset of 'base'
662 */
663static inline
664unsigned int nfs_page_array_len(unsigned int base, size_t len)
665{
666 return ((unsigned long)len + (unsigned long)base +
667 PAGE_SIZE - 1) >> PAGE_SHIFT;
668}
669
670/*
671 * Convert a struct timespec into a 64-bit change attribute
672 *
673 * This does approximately the same thing as timespec_to_ns(),
674 * but for calculation efficiency, we multiply the seconds by
675 * 1024*1024*1024.
676 */
677static inline
678u64 nfs_timespec_to_change_attr(const struct timespec *ts)
679{
680 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
681}
682
683#ifdef CONFIG_CRC32
684/**
685 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
686 * @fh - pointer to filehandle
687 *
688 * returns a crc32 hash for the filehandle that is compatible with
689 * the one displayed by "wireshark".
690 */
691static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
692{
693 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
694}
695static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
696{
697 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
698 NFS4_STATEID_OTHER_SIZE);
699}
700#else
701static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
702{
703 return 0;
704}
705static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
706{
707 return 0;
708}
709#endif
710
711static inline bool nfs_error_is_fatal(int err)
712{
713 switch (err) {
714 case -ERESTARTSYS:
715 case -EIO:
716 case -ENOSPC:
717 case -EROFS:
718 case -E2BIG:
719 return true;
720 default:
721 return false;
722 }
723}
1/*
2 * NFS internal definitions
3 */
4
5#include "nfs4_fs.h"
6#include <linux/mount.h>
7#include <linux/security.h>
8#include <linux/crc32.h>
9
10#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
11
12struct nfs_string;
13
14/* Maximum number of readahead requests
15 * FIXME: this should really be a sysctl so that users may tune it to suit
16 * their needs. People that do NFS over a slow network, might for
17 * instance want to reduce it to something closer to 1 for improved
18 * interactive response.
19 */
20#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
21
22static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
23{
24 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
25 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
26}
27
28static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
29{
30 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
31 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
32 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
33 return 0;
34
35 fattr->fileid = fattr->mounted_on_fileid;
36 return 1;
37}
38
39struct nfs_clone_mount {
40 const struct super_block *sb;
41 const struct dentry *dentry;
42 struct nfs_fh *fh;
43 struct nfs_fattr *fattr;
44 char *hostname;
45 char *mnt_path;
46 struct sockaddr *addr;
47 size_t addrlen;
48 rpc_authflavor_t authflavor;
49};
50
51/*
52 * Note: RFC 1813 doesn't limit the number of auth flavors that
53 * a server can return, so make something up.
54 */
55#define NFS_MAX_SECFLAVORS (12)
56
57/*
58 * Value used if the user did not specify a port value.
59 */
60#define NFS_UNSPEC_PORT (-1)
61
62/*
63 * Maximum number of pages that readdir can use for creating
64 * a vmapped array of pages.
65 */
66#define NFS_MAX_READDIR_PAGES 8
67
68struct nfs_client_initdata {
69 unsigned long init_flags;
70 const char *hostname;
71 const struct sockaddr *addr;
72 size_t addrlen;
73 struct nfs_subversion *nfs_mod;
74 int proto;
75 u32 minorversion;
76 struct net *net;
77};
78
79/*
80 * In-kernel mount arguments
81 */
82struct nfs_parsed_mount_data {
83 int flags;
84 unsigned int rsize, wsize;
85 unsigned int timeo, retrans;
86 unsigned int acregmin, acregmax,
87 acdirmin, acdirmax;
88 unsigned int namlen;
89 unsigned int options;
90 unsigned int bsize;
91 struct nfs_auth_info auth_info;
92 rpc_authflavor_t selected_flavor;
93 char *client_address;
94 unsigned int version;
95 unsigned int minorversion;
96 char *fscache_uniq;
97 bool need_mount;
98
99 struct {
100 struct sockaddr_storage address;
101 size_t addrlen;
102 char *hostname;
103 u32 version;
104 int port;
105 unsigned short protocol;
106 } mount_server;
107
108 struct {
109 struct sockaddr_storage address;
110 size_t addrlen;
111 char *hostname;
112 char *export_path;
113 int port;
114 unsigned short protocol;
115 } nfs_server;
116
117 struct security_mnt_opts lsm_opts;
118 struct net *net;
119};
120
121/* mount_clnt.c */
122struct nfs_mount_request {
123 struct sockaddr *sap;
124 size_t salen;
125 char *hostname;
126 char *dirpath;
127 u32 version;
128 unsigned short protocol;
129 struct nfs_fh *fh;
130 int noresvport;
131 unsigned int *auth_flav_len;
132 rpc_authflavor_t *auth_flavs;
133 struct net *net;
134};
135
136struct nfs_mount_info {
137 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
138 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
139 struct nfs_parsed_mount_data *parsed;
140 struct nfs_clone_mount *cloned;
141 struct nfs_fh *mntfh;
142};
143
144extern int nfs_mount(struct nfs_mount_request *info);
145extern void nfs_umount(const struct nfs_mount_request *info);
146
147/* client.c */
148extern const struct rpc_program nfs_program;
149extern void nfs_clients_init(struct net *net);
150extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
151int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
152struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
153 const struct rpc_timeout *, const char *,
154 rpc_authflavor_t);
155int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
156void nfs_server_insert_lists(struct nfs_server *);
157void nfs_server_remove_lists(struct nfs_server *);
158void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
159int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
160 rpc_authflavor_t);
161struct nfs_server *nfs_alloc_server(void);
162void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
163
164extern void nfs_cleanup_cb_ident_idr(struct net *);
165extern void nfs_put_client(struct nfs_client *);
166extern void nfs_free_client(struct nfs_client *);
167extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
168extern struct nfs_client *
169nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
170 struct nfs4_sessionid *, u32);
171extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
172 struct nfs_subversion *);
173extern struct nfs_server *nfs4_create_server(
174 struct nfs_mount_info *,
175 struct nfs_subversion *);
176extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
177 struct nfs_fh *);
178extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
179 struct sockaddr *sap, size_t salen,
180 struct net *net);
181extern void nfs_free_server(struct nfs_server *server);
182extern struct nfs_server *nfs_clone_server(struct nfs_server *,
183 struct nfs_fh *,
184 struct nfs_fattr *,
185 rpc_authflavor_t);
186extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
187extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
188extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
189 const struct sockaddr *ds_addr,
190 int ds_addrlen, int ds_proto,
191 unsigned int ds_timeo,
192 unsigned int ds_retrans);
193extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
194 struct inode *);
195#ifdef CONFIG_PROC_FS
196extern int __init nfs_fs_proc_init(void);
197extern void nfs_fs_proc_exit(void);
198#else
199static inline int nfs_fs_proc_init(void)
200{
201 return 0;
202}
203static inline void nfs_fs_proc_exit(void)
204{
205}
206#endif
207
208#ifdef CONFIG_NFS_V4_1
209int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
210#endif
211
212/* nfs3client.c */
213#if IS_ENABLED(CONFIG_NFS_V3)
214struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *);
215struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *,
216 struct nfs_fattr *, rpc_authflavor_t);
217#endif
218
219/* callback_xdr.c */
220extern struct svc_version nfs4_callback_version1;
221extern struct svc_version nfs4_callback_version4;
222
223struct nfs_pageio_descriptor;
224/* pagelist.c */
225extern int __init nfs_init_nfspagecache(void);
226extern void nfs_destroy_nfspagecache(void);
227extern int __init nfs_init_readpagecache(void);
228extern void nfs_destroy_readpagecache(void);
229extern int __init nfs_init_writepagecache(void);
230extern void nfs_destroy_writepagecache(void);
231
232extern int __init nfs_init_directcache(void);
233extern void nfs_destroy_directcache(void);
234extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
235extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
236 struct nfs_pgio_header *hdr,
237 void (*release)(struct nfs_pgio_header *hdr));
238void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
239int nfs_iocounter_wait(struct nfs_io_counter *c);
240
241static inline void nfs_iocounter_init(struct nfs_io_counter *c)
242{
243 c->flags = 0;
244 atomic_set(&c->io_count, 0);
245}
246
247/* nfs2xdr.c */
248extern struct rpc_procinfo nfs_procedures[];
249extern int nfs2_decode_dirent(struct xdr_stream *,
250 struct nfs_entry *, int);
251
252/* nfs3xdr.c */
253extern struct rpc_procinfo nfs3_procedures[];
254extern int nfs3_decode_dirent(struct xdr_stream *,
255 struct nfs_entry *, int);
256
257/* nfs4xdr.c */
258#if IS_ENABLED(CONFIG_NFS_V4)
259extern int nfs4_decode_dirent(struct xdr_stream *,
260 struct nfs_entry *, int);
261#endif
262#ifdef CONFIG_NFS_V4_1
263extern const u32 nfs41_maxread_overhead;
264extern const u32 nfs41_maxwrite_overhead;
265extern const u32 nfs41_maxgetdevinfo_overhead;
266#endif
267
268/* nfs4proc.c */
269#if IS_ENABLED(CONFIG_NFS_V4)
270extern struct rpc_procinfo nfs4_procedures[];
271#endif
272
273#ifdef CONFIG_NFS_V4_SECURITY_LABEL
274extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
275static inline void nfs4_label_free(struct nfs4_label *label)
276{
277 if (label) {
278 kfree(label->label);
279 kfree(label);
280 }
281 return;
282}
283
284static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
285{
286 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
287 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
288}
289#else
290static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
291static inline void nfs4_label_free(void *label) {}
292static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
293{
294}
295#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
296
297/* proc.c */
298void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
299extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
300 const struct rpc_timeout *timeparms,
301 const char *ip_addr);
302
303/* dir.c */
304extern void nfs_force_use_readdirplus(struct inode *dir);
305extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
306 struct shrink_control *sc);
307extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
308 struct shrink_control *sc);
309struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
310int nfs_create(struct inode *, struct dentry *, umode_t, bool);
311int nfs_mkdir(struct inode *, struct dentry *, umode_t);
312int nfs_rmdir(struct inode *, struct dentry *);
313int nfs_unlink(struct inode *, struct dentry *);
314int nfs_symlink(struct inode *, struct dentry *, const char *);
315int nfs_link(struct dentry *, struct inode *, struct dentry *);
316int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
317int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
318
319/* file.c */
320int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
321loff_t nfs_file_llseek(struct file *, loff_t, int);
322int nfs_file_flush(struct file *, fl_owner_t);
323ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
324ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
325 size_t, unsigned int);
326int nfs_file_mmap(struct file *, struct vm_area_struct *);
327ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
328int nfs_file_release(struct inode *, struct file *);
329int nfs_lock(struct file *, int, struct file_lock *);
330int nfs_flock(struct file *, int, struct file_lock *);
331ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
332 size_t, unsigned int);
333int nfs_check_flags(int);
334int nfs_setlease(struct file *, long, struct file_lock **);
335
336/* inode.c */
337extern struct workqueue_struct *nfsiod_workqueue;
338extern struct inode *nfs_alloc_inode(struct super_block *sb);
339extern void nfs_destroy_inode(struct inode *);
340extern int nfs_write_inode(struct inode *, struct writeback_control *);
341extern int nfs_drop_inode(struct inode *);
342extern void nfs_clear_inode(struct inode *);
343extern void nfs_evict_inode(struct inode *);
344void nfs_zap_acl_cache(struct inode *inode);
345extern int nfs_wait_bit_killable(void *word);
346
347/* super.c */
348extern const struct super_operations nfs_sops;
349extern struct file_system_type nfs_fs_type;
350extern struct file_system_type nfs_xdev_fs_type;
351#if IS_ENABLED(CONFIG_NFS_V4)
352extern struct file_system_type nfs4_xdev_fs_type;
353extern struct file_system_type nfs4_referral_fs_type;
354#endif
355bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
356struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
357 struct nfs_subversion *);
358void nfs_initialise_sb(struct super_block *);
359int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
360int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
361struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
362 struct nfs_mount_info *, struct nfs_subversion *);
363struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
364struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
365 const char *, struct nfs_mount_info *);
366void nfs_kill_super(struct super_block *);
367void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
368
369extern struct rpc_stat nfs_rpcstat;
370
371extern int __init register_nfs_fs(void);
372extern void __exit unregister_nfs_fs(void);
373extern void nfs_sb_active(struct super_block *sb);
374extern void nfs_sb_deactive(struct super_block *sb);
375
376/* namespace.c */
377#define NFS_PATH_CANONICAL 1
378extern char *nfs_path(char **p, struct dentry *dentry,
379 char *buffer, ssize_t buflen, unsigned flags);
380extern struct vfsmount *nfs_d_automount(struct path *path);
381struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
382 struct nfs_fh *, struct nfs_fattr *);
383struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
384 struct nfs_fattr *, rpc_authflavor_t);
385
386/* getroot.c */
387extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
388 const char *);
389#if IS_ENABLED(CONFIG_NFS_V4)
390extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
391 const char *);
392
393extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
394#endif
395
396struct nfs_pgio_completion_ops;
397/* read.c */
398extern struct nfs_read_header *nfs_readhdr_alloc(void);
399extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
400extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
401 struct inode *inode,
402 const struct nfs_pgio_completion_ops *compl_ops);
403extern int nfs_initiate_read(struct rpc_clnt *clnt,
404 struct nfs_read_data *data,
405 const struct rpc_call_ops *call_ops, int flags);
406extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
407extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
408 struct nfs_pgio_header *hdr);
409extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
410extern void nfs_readdata_release(struct nfs_read_data *rdata);
411
412/* super.c */
413void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
414void nfs_umount_begin(struct super_block *);
415int nfs_statfs(struct dentry *, struct kstatfs *);
416int nfs_show_options(struct seq_file *, struct dentry *);
417int nfs_show_devname(struct seq_file *, struct dentry *);
418int nfs_show_path(struct seq_file *, struct dentry *);
419int nfs_show_stats(struct seq_file *, struct dentry *);
420void nfs_put_super(struct super_block *);
421int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
422
423/* write.c */
424extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
425 struct inode *inode, int ioflags,
426 const struct nfs_pgio_completion_ops *compl_ops);
427extern struct nfs_write_header *nfs_writehdr_alloc(void);
428extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
429extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
430 struct nfs_pgio_header *hdr);
431extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
432extern void nfs_writedata_release(struct nfs_write_data *wdata);
433extern void nfs_commit_free(struct nfs_commit_data *p);
434extern int nfs_initiate_write(struct rpc_clnt *clnt,
435 struct nfs_write_data *data,
436 const struct rpc_call_ops *call_ops,
437 int how, int flags);
438extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
439extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
440extern int nfs_initiate_commit(struct rpc_clnt *clnt,
441 struct nfs_commit_data *data,
442 const struct rpc_call_ops *call_ops,
443 int how, int flags);
444extern void nfs_init_commit(struct nfs_commit_data *data,
445 struct list_head *head,
446 struct pnfs_layout_segment *lseg,
447 struct nfs_commit_info *cinfo);
448int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
449 struct nfs_commit_info *cinfo, int max);
450int nfs_scan_commit(struct inode *inode, struct list_head *dst,
451 struct nfs_commit_info *cinfo);
452void nfs_mark_request_commit(struct nfs_page *req,
453 struct pnfs_layout_segment *lseg,
454 struct nfs_commit_info *cinfo);
455int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
456 int how, struct nfs_commit_info *cinfo);
457void nfs_retry_commit(struct list_head *page_list,
458 struct pnfs_layout_segment *lseg,
459 struct nfs_commit_info *cinfo);
460void nfs_commitdata_release(struct nfs_commit_data *data);
461void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
462 struct nfs_commit_info *cinfo);
463void nfs_request_remove_commit_list(struct nfs_page *req,
464 struct nfs_commit_info *cinfo);
465void nfs_init_cinfo(struct nfs_commit_info *cinfo,
466 struct inode *inode,
467 struct nfs_direct_req *dreq);
468int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
469bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
470
471#ifdef CONFIG_MIGRATION
472extern int nfs_migrate_page(struct address_space *,
473 struct page *, struct page *, enum migrate_mode);
474#else
475#define nfs_migrate_page NULL
476#endif
477
478/* unlink.c */
479extern struct rpc_task *
480nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
481 struct dentry *old_dentry, struct dentry *new_dentry,
482 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
483extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
484
485/* direct.c */
486void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
487 struct nfs_direct_req *dreq);
488static inline void nfs_inode_dio_wait(struct inode *inode)
489{
490 inode_dio_wait(inode);
491}
492extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
493
494/* nfs4proc.c */
495extern void __nfs4_read_done_cb(struct nfs_read_data *);
496extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
497 const struct rpc_timeout *timeparms,
498 const char *ip_addr);
499extern int nfs40_walk_client_list(struct nfs_client *clp,
500 struct nfs_client **result,
501 struct rpc_cred *cred);
502extern int nfs41_walk_client_list(struct nfs_client *clp,
503 struct nfs_client **result,
504 struct rpc_cred *cred);
505
506/*
507 * Determine the device name as a string
508 */
509static inline char *nfs_devname(struct dentry *dentry,
510 char *buffer, ssize_t buflen)
511{
512 char *dummy;
513 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
514}
515
516/*
517 * Determine the actual block size (and log2 thereof)
518 */
519static inline
520unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
521{
522 /* make sure blocksize is a power of two */
523 if ((bsize & (bsize - 1)) || nrbitsp) {
524 unsigned char nrbits;
525
526 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
527 ;
528 bsize = 1 << nrbits;
529 if (nrbitsp)
530 *nrbitsp = nrbits;
531 }
532
533 return bsize;
534}
535
536/*
537 * Calculate the number of 512byte blocks used.
538 */
539static inline blkcnt_t nfs_calc_block_size(u64 tsize)
540{
541 blkcnt_t used = (tsize + 511) >> 9;
542 return (used > ULONG_MAX) ? ULONG_MAX : used;
543}
544
545/*
546 * Compute and set NFS server blocksize
547 */
548static inline
549unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
550{
551 if (bsize < NFS_MIN_FILE_IO_SIZE)
552 bsize = NFS_DEF_FILE_IO_SIZE;
553 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
554 bsize = NFS_MAX_FILE_IO_SIZE;
555
556 return nfs_block_bits(bsize, nrbitsp);
557}
558
559/*
560 * Determine the maximum file size for a superblock
561 */
562static inline
563void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
564{
565 sb->s_maxbytes = (loff_t)maxfilesize;
566 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
567 sb->s_maxbytes = MAX_LFS_FILESIZE;
568}
569
570/*
571 * Determine the number of bytes of data the page contains
572 */
573static inline
574unsigned int nfs_page_length(struct page *page)
575{
576 loff_t i_size = i_size_read(page_file_mapping(page)->host);
577
578 if (i_size > 0) {
579 pgoff_t page_index = page_file_index(page);
580 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
581 if (page_index < end_index)
582 return PAGE_CACHE_SIZE;
583 if (page_index == end_index)
584 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
585 }
586 return 0;
587}
588
589/*
590 * Convert a umode to a dirent->d_type
591 */
592static inline
593unsigned char nfs_umode_to_dtype(umode_t mode)
594{
595 return (mode >> 12) & 15;
596}
597
598/*
599 * Determine the number of pages in an array of length 'len' and
600 * with a base offset of 'base'
601 */
602static inline
603unsigned int nfs_page_array_len(unsigned int base, size_t len)
604{
605 return ((unsigned long)len + (unsigned long)base +
606 PAGE_SIZE - 1) >> PAGE_SHIFT;
607}
608
609/*
610 * Convert a struct timespec into a 64-bit change attribute
611 *
612 * This does approximately the same thing as timespec_to_ns(),
613 * but for calculation efficiency, we multiply the seconds by
614 * 1024*1024*1024.
615 */
616static inline
617u64 nfs_timespec_to_change_attr(const struct timespec *ts)
618{
619 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
620}
621
622#ifdef CONFIG_CRC32
623/**
624 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
625 * @fh - pointer to filehandle
626 *
627 * returns a crc32 hash for the filehandle that is compatible with
628 * the one displayed by "wireshark".
629 */
630static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
631{
632 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
633}
634#else
635static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
636{
637 return 0;
638}
639#endif