1
2
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
16
17
18
19
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
52
53
54#define NFS_MAX_SECFLAVORS (12)
55
56
57
58
59#define NFS_UNSPEC_PORT (-1)
60
61#define NFS_UNSPEC_RETRANS (UINT_MAX)
62#define NFS_UNSPEC_TIMEO (UINT_MAX)
63
64
65
66
67
68#define NFS_MAX_READDIR_PAGES 8
69
70struct nfs_client_initdata {
71 unsigned long init_flags;
72 const char *hostname;
73 const struct sockaddr *addr;
74 const char *nodename;
75 const char *ip_addr;
76 size_t addrlen;
77 struct nfs_subversion *nfs_mod;
78 int proto;
79 u32 minorversion;
80 struct net *net;
81 const struct rpc_timeout *timeparms;
82};
83
84
85
86
87struct nfs_parsed_mount_data {
88 int flags;
89 unsigned int rsize, wsize;
90 unsigned int timeo, retrans;
91 unsigned int acregmin, acregmax,
92 acdirmin, acdirmax;
93 unsigned int namlen;
94 unsigned int options;
95 unsigned int bsize;
96 struct nfs_auth_info auth_info;
97 rpc_authflavor_t selected_flavor;
98 char *client_address;
99 unsigned int version;
100 unsigned int minorversion;
101 char *fscache_uniq;
102 bool need_mount;
103
104 struct {
105 struct sockaddr_storage address;
106 size_t addrlen;
107 char *hostname;
108 u32 version;
109 int port;
110 unsigned short protocol;
111 } mount_server;
112
113 struct {
114 struct sockaddr_storage address;
115 size_t addrlen;
116 char *hostname;
117 char *export_path;
118 int port;
119 unsigned short protocol;
120 } nfs_server;
121
122 struct security_mnt_opts lsm_opts;
123 struct net *net;
124};
125
126
127struct nfs_mount_request {
128 struct sockaddr *sap;
129 size_t salen;
130 char *hostname;
131 char *dirpath;
132 u32 version;
133 unsigned short protocol;
134 struct nfs_fh *fh;
135 int noresvport;
136 unsigned int *auth_flav_len;
137 rpc_authflavor_t *auth_flavs;
138 struct net *net;
139};
140
141struct nfs_mount_info {
142 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
143 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
144 struct nfs_parsed_mount_data *parsed;
145 struct nfs_clone_mount *cloned;
146 struct nfs_fh *mntfh;
147};
148
149extern int nfs_mount(struct nfs_mount_request *info);
150extern void nfs_umount(const struct nfs_mount_request *info);
151
152
153extern const struct rpc_program nfs_program;
154extern void nfs_clients_init(struct net *net);
155extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
156int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
157struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
158int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
159void nfs_server_insert_lists(struct nfs_server *);
160void nfs_server_remove_lists(struct nfs_server *);
161void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
162int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
163 rpc_authflavor_t);
164struct nfs_server *nfs_alloc_server(void);
165void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
166
167extern void nfs_cleanup_cb_ident_idr(struct net *);
168extern void nfs_put_client(struct nfs_client *);
169extern void nfs_free_client(struct nfs_client *);
170extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
171extern struct nfs_client *
172nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
173 struct nfs4_sessionid *, u32);
174extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
175 struct nfs_subversion *);
176extern struct nfs_server *nfs4_create_server(
177 struct nfs_mount_info *,
178 struct nfs_subversion *);
179extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
180 struct nfs_fh *);
181extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
182 struct sockaddr *sap, size_t salen,
183 struct net *net);
184extern void nfs_free_server(struct nfs_server *server);
185extern struct nfs_server *nfs_clone_server(struct nfs_server *,
186 struct nfs_fh *,
187 struct nfs_fattr *,
188 rpc_authflavor_t);
189extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
190extern int nfs_client_init_status(const struct nfs_client *clp);
191extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
192extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
193extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
194 const struct sockaddr *ds_addr,
195 int ds_addrlen, int ds_proto,
196 unsigned int ds_timeo,
197 unsigned int ds_retrans,
198 u32 minor_version);
199extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
200 struct inode *);
201extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
202 const struct sockaddr *ds_addr, int ds_addrlen,
203 int ds_proto, unsigned int ds_timeo,
204 unsigned int ds_retrans);
205#ifdef CONFIG_PROC_FS
206extern int __init nfs_fs_proc_init(void);
207extern void nfs_fs_proc_exit(void);
208extern int nfs_fs_proc_net_init(struct net *net);
209extern void nfs_fs_proc_net_exit(struct net *net);
210#else
211static inline int nfs_fs_proc_net_init(struct net *net)
212{
213 return 0;
214}
215static inline void nfs_fs_proc_net_exit(struct net *net)
216{
217}
218static inline int nfs_fs_proc_init(void)
219{
220 return 0;
221}
222static inline void nfs_fs_proc_exit(void)
223{
224}
225#endif
226
227
228extern struct svc_version nfs4_callback_version1;
229extern struct svc_version nfs4_callback_version4;
230
231struct nfs_pageio_descriptor;
232
233extern int __init nfs_init_nfspagecache(void);
234extern void nfs_destroy_nfspagecache(void);
235extern int __init nfs_init_readpagecache(void);
236extern void nfs_destroy_readpagecache(void);
237extern int __init nfs_init_writepagecache(void);
238extern void nfs_destroy_writepagecache(void);
239
240extern int __init nfs_init_directcache(void);
241extern void nfs_destroy_directcache(void);
242extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
243 struct nfs_pgio_header *hdr,
244 void (*release)(struct nfs_pgio_header *hdr));
245void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
246int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
247
248extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
249struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
250void nfs_pgio_header_free(struct nfs_pgio_header *);
251void nfs_pgio_data_destroy(struct nfs_pgio_header *);
252int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
253int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
254 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
255 const struct rpc_call_ops *call_ops, int how, int flags);
256void nfs_free_request(struct nfs_page *req);
257struct nfs_pgio_mirror *
258nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
259
260static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
261{
262 WARN_ON_ONCE(desc->pg_mirror_count < 1);
263 return desc->pg_mirror_count > 1;
264}
265
266static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
267 const struct nfs_open_context *ctx2)
268{
269 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
270}
271
272
273extern struct rpc_procinfo nfs_procedures[];
274extern int nfs2_decode_dirent(struct xdr_stream *,
275 struct nfs_entry *, int);
276
277
278extern struct rpc_procinfo nfs3_procedures[];
279extern int nfs3_decode_dirent(struct xdr_stream *,
280 struct nfs_entry *, int);
281
282
283#if IS_ENABLED(CONFIG_NFS_V4)
284extern int nfs4_decode_dirent(struct xdr_stream *,
285 struct nfs_entry *, int);
286#endif
287#ifdef CONFIG_NFS_V4_1
288extern const u32 nfs41_maxread_overhead;
289extern const u32 nfs41_maxwrite_overhead;
290extern const u32 nfs41_maxgetdevinfo_overhead;
291#endif
292
293
294#if IS_ENABLED(CONFIG_NFS_V4)
295extern struct rpc_procinfo nfs4_procedures[];
296#endif
297
298#ifdef CONFIG_NFS_V4_SECURITY_LABEL
299extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
300static inline struct nfs4_label *
301nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
302{
303 if (!dst || !src)
304 return NULL;
305
306 if (src->len > NFS4_MAXLABELLEN)
307 return NULL;
308
309 dst->lfs = src->lfs;
310 dst->pi = src->pi;
311 dst->len = src->len;
312 memcpy(dst->label, src->label, src->len);
313
314 return dst;
315}
316static inline void nfs4_label_free(struct nfs4_label *label)
317{
318 if (label) {
319 kfree(label->label);
320 kfree(label);
321 }
322 return;
323}
324
325static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
326{
327 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
328 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
329}
330#else
331static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
332static inline void nfs4_label_free(void *label) {}
333static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
334{
335}
336static inline struct nfs4_label *
337nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
338{
339 return NULL;
340}
341#endif
342
343
344void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
345extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
346 const struct nfs_client_initdata *);
347
348
349extern void nfs_advise_use_readdirplus(struct inode *dir);
350extern void nfs_force_use_readdirplus(struct inode *dir);
351extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
352 struct shrink_control *sc);
353extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
354 struct shrink_control *sc);
355struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
356int nfs_create(struct inode *, struct dentry *, umode_t, bool);
357int nfs_mkdir(struct inode *, struct dentry *, umode_t);
358int nfs_rmdir(struct inode *, struct dentry *);
359int nfs_unlink(struct inode *, struct dentry *);
360int nfs_symlink(struct inode *, struct dentry *, const char *);
361int nfs_link(struct dentry *, struct inode *, struct dentry *);
362int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
363int nfs_rename(struct inode *, struct dentry *,
364 struct inode *, struct dentry *, unsigned int);
365
366
367int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
368loff_t nfs_file_llseek(struct file *, loff_t, int);
369ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
370int nfs_file_mmap(struct file *, struct vm_area_struct *);
371ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
372int nfs_file_release(struct inode *, struct file *);
373int nfs_lock(struct file *, int, struct file_lock *);
374int nfs_flock(struct file *, int, struct file_lock *);
375int nfs_check_flags(int);
376
377
378extern struct workqueue_struct *nfsiod_workqueue;
379extern struct inode *nfs_alloc_inode(struct super_block *sb);
380extern void nfs_destroy_inode(struct inode *);
381extern int nfs_write_inode(struct inode *, struct writeback_control *);
382extern int nfs_drop_inode(struct inode *);
383extern void nfs_clear_inode(struct inode *);
384extern void nfs_evict_inode(struct inode *);
385void nfs_zap_acl_cache(struct inode *inode);
386extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
387extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
388extern int nfs_wait_atomic_killable(atomic_t *p);
389
390
391extern const struct super_operations nfs_sops;
392extern struct file_system_type nfs_fs_type;
393extern struct file_system_type nfs_xdev_fs_type;
394#if IS_ENABLED(CONFIG_NFS_V4)
395extern struct file_system_type nfs4_xdev_fs_type;
396extern struct file_system_type nfs4_referral_fs_type;
397#endif
398bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
399struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
400 struct nfs_subversion *);
401void nfs_initialise_sb(struct super_block *);
402int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
403int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
404struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
405 struct nfs_mount_info *, struct nfs_subversion *);
406struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
407struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
408 const char *, struct nfs_mount_info *);
409void nfs_kill_super(struct super_block *);
410void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
411
412extern struct rpc_stat nfs_rpcstat;
413
414extern int __init register_nfs_fs(void);
415extern void __exit unregister_nfs_fs(void);
416extern bool nfs_sb_active(struct super_block *sb);
417extern void nfs_sb_deactive(struct super_block *sb);
418
419
420extern void nfs_start_io_read(struct inode *inode);
421extern void nfs_end_io_read(struct inode *inode);
422extern void nfs_start_io_write(struct inode *inode);
423extern void nfs_end_io_write(struct inode *inode);
424extern void nfs_start_io_direct(struct inode *inode);
425extern void nfs_end_io_direct(struct inode *inode);
426
427static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
428{
429 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
430}
431
432
433#define NFS_PATH_CANONICAL 1
434extern char *nfs_path(char **p, struct dentry *dentry,
435 char *buffer, ssize_t buflen, unsigned flags);
436extern struct vfsmount *nfs_d_automount(struct path *path);
437struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
438 struct nfs_fh *, struct nfs_fattr *);
439struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
440 struct nfs_fattr *, rpc_authflavor_t);
441
442
443extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
444 const char *);
445#if IS_ENABLED(CONFIG_NFS_V4)
446extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
447 const char *);
448
449extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
450#endif
451
452struct nfs_pgio_completion_ops;
453
454extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
455 struct inode *inode, bool force_mds,
456 const struct nfs_pgio_completion_ops *compl_ops);
457extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
458extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
459
460
461void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
462void nfs_umount_begin(struct super_block *);
463int nfs_statfs(struct dentry *, struct kstatfs *);
464int nfs_show_options(struct seq_file *, struct dentry *);
465int nfs_show_devname(struct seq_file *, struct dentry *);
466int nfs_show_path(struct seq_file *, struct dentry *);
467int nfs_show_stats(struct seq_file *, struct dentry *);
468int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
469
470
471extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
472 struct inode *inode, int ioflags, bool force_mds,
473 const struct nfs_pgio_completion_ops *compl_ops);
474extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
475extern void nfs_commit_free(struct nfs_commit_data *p);
476extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
477extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
478extern int nfs_initiate_commit(struct rpc_clnt *clnt,
479 struct nfs_commit_data *data,
480 const struct nfs_rpc_ops *nfs_ops,
481 const struct rpc_call_ops *call_ops,
482 int how, int flags);
483extern void nfs_init_commit(struct nfs_commit_data *data,
484 struct list_head *head,
485 struct pnfs_layout_segment *lseg,
486 struct nfs_commit_info *cinfo);
487int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
488 struct nfs_commit_info *cinfo, int max);
489unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
490int nfs_scan_commit(struct inode *inode, struct list_head *dst,
491 struct nfs_commit_info *cinfo);
492void nfs_mark_request_commit(struct nfs_page *req,
493 struct pnfs_layout_segment *lseg,
494 struct nfs_commit_info *cinfo,
495 u32 ds_commit_idx);
496int nfs_write_need_commit(struct nfs_pgio_header *);
497void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
498int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf);
499int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
500 int how, struct nfs_commit_info *cinfo);
501void nfs_retry_commit(struct list_head *page_list,
502 struct pnfs_layout_segment *lseg,
503 struct nfs_commit_info *cinfo,
504 u32 ds_commit_idx);
505void nfs_commitdata_release(struct nfs_commit_data *data);
506void nfs_request_add_commit_list(struct nfs_page *req,
507 struct nfs_commit_info *cinfo);
508void nfs_request_add_commit_list_locked(struct nfs_page *req,
509 struct list_head *dst,
510 struct nfs_commit_info *cinfo);
511void nfs_request_remove_commit_list(struct nfs_page *req,
512 struct nfs_commit_info *cinfo);
513void nfs_init_cinfo(struct nfs_commit_info *cinfo,
514 struct inode *inode,
515 struct nfs_direct_req *dreq);
516int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
517bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
518void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
519
520int nfs_filemap_write_and_wait_range(struct address_space *mapping,
521 loff_t lstart, loff_t lend);
522
523#ifdef CONFIG_NFS_V4_1
524static inline
525void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
526{
527 int i;
528
529 for (i = 0; i < cinfo->nbuckets; i++)
530 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
531}
532#else
533static inline
534void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
535{
536}
537#endif
538
539#ifdef CONFIG_MIGRATION
540extern int nfs_migrate_page(struct address_space *,
541 struct page *, struct page *, enum migrate_mode);
542#endif
543
544static inline int
545nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
546 const struct nfs_write_verifier *v2)
547{
548 return memcmp(v1->data, v2->data, sizeof(v1->data));
549}
550
551
552extern struct rpc_task *
553nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
554 struct dentry *old_dentry, struct dentry *new_dentry,
555 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
556extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
557
558
559void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
560 struct nfs_direct_req *dreq);
561extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
562
563
564extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
565 const struct nfs_client_initdata *);
566extern int nfs40_walk_client_list(struct nfs_client *clp,
567 struct nfs_client **result,
568 struct rpc_cred *cred);
569extern int nfs41_walk_client_list(struct nfs_client *clp,
570 struct nfs_client **result,
571 struct rpc_cred *cred);
572extern int nfs4_test_session_trunk(struct rpc_clnt *,
573 struct rpc_xprt *,
574 void *);
575
576static inline struct inode *nfs_igrab_and_active(struct inode *inode)
577{
578 inode = igrab(inode);
579 if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
580 iput(inode);
581 inode = NULL;
582 }
583 return inode;
584}
585
586static inline void nfs_iput_and_deactive(struct inode *inode)
587{
588 if (inode != NULL) {
589 struct super_block *sb = inode->i_sb;
590
591 iput(inode);
592 nfs_sb_deactive(sb);
593 }
594}
595
596
597
598
599static inline char *nfs_devname(struct dentry *dentry,
600 char *buffer, ssize_t buflen)
601{
602 char *dummy;
603 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
604}
605
606
607
608
609static inline
610unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
611{
612
613 if ((bsize & (bsize - 1)) || nrbitsp) {
614 unsigned char nrbits;
615
616 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
617 ;
618 bsize = 1 << nrbits;
619 if (nrbitsp)
620 *nrbitsp = nrbits;
621 }
622
623 return bsize;
624}
625
626
627
628
629static inline blkcnt_t nfs_calc_block_size(u64 tsize)
630{
631 blkcnt_t used = (tsize + 511) >> 9;
632 return (used > ULONG_MAX) ? ULONG_MAX : used;
633}
634
635
636
637
638static inline
639unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
640{
641 if (bsize < NFS_MIN_FILE_IO_SIZE)
642 bsize = NFS_DEF_FILE_IO_SIZE;
643 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
644 bsize = NFS_MAX_FILE_IO_SIZE;
645
646 return nfs_block_bits(bsize, nrbitsp);
647}
648
649
650
651
652static inline
653void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
654{
655 sb->s_maxbytes = (loff_t)maxfilesize;
656 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
657 sb->s_maxbytes = MAX_LFS_FILESIZE;
658}
659
660
661
662
663static inline
664void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
665{
666 if (!cinfo->dreq) {
667 struct inode *inode = page_file_mapping(page)->host;
668
669 inc_node_page_state(page, NR_UNSTABLE_NFS);
670 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
671 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
672 }
673}
674
675
676
677
678static inline
679unsigned int nfs_page_length(struct page *page)
680{
681 loff_t i_size = i_size_read(page_file_mapping(page)->host);
682
683 if (i_size > 0) {
684 pgoff_t index = page_index(page);
685 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
686 if (index < end_index)
687 return PAGE_SIZE;
688 if (index == end_index)
689 return ((i_size - 1) & ~PAGE_MASK) + 1;
690 }
691 return 0;
692}
693
694
695
696
697static inline
698unsigned char nfs_umode_to_dtype(umode_t mode)
699{
700 return (mode >> 12) & 15;
701}
702
703
704
705
706
707static inline
708unsigned int nfs_page_array_len(unsigned int base, size_t len)
709{
710 return ((unsigned long)len + (unsigned long)base +
711 PAGE_SIZE - 1) >> PAGE_SHIFT;
712}
713
714
715
716
717
718
719
720
721static inline
722u64 nfs_timespec_to_change_attr(const struct timespec *ts)
723{
724 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
725}
726
727#ifdef CONFIG_CRC32
728
729
730
731
732
733
734
735static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
736{
737 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
738}
739static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
740{
741 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
742 NFS4_STATEID_OTHER_SIZE);
743}
744#else
745static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
746{
747 return 0;
748}
749static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
750{
751 return 0;
752}
753#endif
754
755static inline bool nfs_error_is_fatal(int err)
756{
757 switch (err) {
758 case -ERESTARTSYS:
759 case -EIO:
760 case -ENOSPC:
761 case -EROFS:
762 case -E2BIG:
763 return true;
764 default:
765 return false;
766 }
767}
768
