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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * NFS internal definitions
4 */
5
6#include "nfs4_fs.h"
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>
13
14#define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
15
16extern const struct export_operations nfs_export_ops;
17
18struct nfs_string;
19struct nfs_pageio_descriptor;
20
21static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
22{
23 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
24 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
25}
26
27static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
28{
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)))
32 return 0;
33 return 1;
34}
35
36static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry)
37{
38 if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL))
39 return false;
40 if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size)
41 return false;
42 return true;
43}
44
45/*
46 * Note: RFC 1813 doesn't limit the number of auth flavors that
47 * a server can return, so make something up.
48 */
49#define NFS_MAX_SECFLAVORS (12)
50
51/*
52 * Value used if the user did not specify a port value.
53 */
54#define NFS_UNSPEC_PORT (-1)
55
56#define NFS_UNSPEC_RETRANS (UINT_MAX)
57#define NFS_UNSPEC_TIMEO (UINT_MAX)
58
59struct nfs_client_initdata {
60 unsigned long init_flags;
61 const char *hostname; /* Hostname of the server */
62 const struct sockaddr *addr; /* Address of the server */
63 const char *nodename; /* Hostname of the client */
64 const char *ip_addr; /* IP address of the client */
65 size_t addrlen;
66 struct nfs_subversion *nfs_mod;
67 int proto;
68 u32 minorversion;
69 unsigned int nconnect;
70 struct net *net;
71 const struct rpc_timeout *timeparms;
72 const struct cred *cred;
73};
74
75/*
76 * In-kernel mount arguments
77 */
78struct nfs_fs_context {
79 bool internal;
80 bool skip_reconfig_option_check;
81 bool need_mount;
82 bool sloppy;
83 unsigned int flags; /* NFS{,4}_MOUNT_* flags */
84 unsigned int rsize, wsize;
85 unsigned int timeo, retrans;
86 unsigned int acregmin, acregmax;
87 unsigned int acdirmin, acdirmax;
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 unsigned short protofamily;
98 unsigned short mountfamily;
99 bool has_sec_mnt_opts;
100
101 struct {
102 union {
103 struct sockaddr address;
104 struct sockaddr_storage _address;
105 };
106 size_t addrlen;
107 char *hostname;
108 u32 version;
109 int port;
110 unsigned short protocol;
111 } mount_server;
112
113 struct {
114 union {
115 struct sockaddr address;
116 struct sockaddr_storage _address;
117 };
118 size_t addrlen;
119 char *hostname;
120 char *export_path;
121 int port;
122 unsigned short protocol;
123 unsigned short nconnect;
124 unsigned short export_path_len;
125 } nfs_server;
126
127 struct nfs_fh *mntfh;
128 struct nfs_server *server;
129 struct nfs_subversion *nfs_mod;
130
131 /* Information for a cloned mount. */
132 struct nfs_clone_mount {
133 struct super_block *sb;
134 struct dentry *dentry;
135 struct nfs_fattr *fattr;
136 unsigned int inherited_bsize;
137 } clone_data;
138};
139
140#define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \
141 errorf(fc, fmt, ## __VA_ARGS__) : \
142 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
143
144#define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \
145 errorf(fc, fmt, ## __VA_ARGS__) : \
146 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
147
148#define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \
149 invalf(fc, fmt, ## __VA_ARGS__) : \
150 ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; }))
151
152#define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \
153 invalf(fc, fmt, ## __VA_ARGS__) : \
154 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; }))
155
156#define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \
157 warnf(fc, fmt, ## __VA_ARGS__) : \
158 ({ dprintk(fmt "\n", ## __VA_ARGS__); }))
159
160#define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \
161 warnf(fc, fmt, ## __VA_ARGS__) : \
162 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); }))
163
164static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
165{
166 return fc->fs_private;
167}
168
169/* mount_clnt.c */
170struct nfs_mount_request {
171 struct sockaddr *sap;
172 size_t salen;
173 char *hostname;
174 char *dirpath;
175 u32 version;
176 unsigned short protocol;
177 struct nfs_fh *fh;
178 int noresvport;
179 unsigned int *auth_flav_len;
180 rpc_authflavor_t *auth_flavs;
181 struct net *net;
182};
183
184extern int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans);
185extern void nfs_umount(const struct nfs_mount_request *info);
186
187/* client.c */
188extern const struct rpc_program nfs_program;
189extern void nfs_clients_init(struct net *net);
190extern void nfs_clients_exit(struct net *net);
191extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
192int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
193struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
194int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
195void nfs_server_insert_lists(struct nfs_server *);
196void nfs_server_remove_lists(struct nfs_server *);
197void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
198int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
199 rpc_authflavor_t);
200struct nfs_server *nfs_alloc_server(void);
201void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
202
203extern void nfs_put_client(struct nfs_client *);
204extern void nfs_free_client(struct nfs_client *);
205extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
206extern struct nfs_client *
207nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
208 struct nfs4_sessionid *, u32);
209extern struct nfs_server *nfs_create_server(struct fs_context *);
210extern struct nfs_server *nfs4_create_server(struct fs_context *);
211extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
212extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
213 struct sockaddr *sap, size_t salen,
214 struct net *net);
215extern void nfs_free_server(struct nfs_server *server);
216extern struct nfs_server *nfs_clone_server(struct nfs_server *,
217 struct nfs_fh *,
218 struct nfs_fattr *,
219 rpc_authflavor_t);
220extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
221extern int nfs_client_init_status(const struct nfs_client *clp);
222extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
223extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
224extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
225 const struct sockaddr *ds_addr,
226 int ds_addrlen, int ds_proto,
227 unsigned int ds_timeo,
228 unsigned int ds_retrans,
229 u32 minor_version);
230extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
231 struct inode *);
232extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
233 const struct sockaddr *ds_addr, int ds_addrlen,
234 int ds_proto, unsigned int ds_timeo,
235 unsigned int ds_retrans);
236#ifdef CONFIG_PROC_FS
237extern int __init nfs_fs_proc_init(void);
238extern void nfs_fs_proc_exit(void);
239extern int nfs_fs_proc_net_init(struct net *net);
240extern void nfs_fs_proc_net_exit(struct net *net);
241#else
242static inline int nfs_fs_proc_net_init(struct net *net)
243{
244 return 0;
245}
246static inline void nfs_fs_proc_net_exit(struct net *net)
247{
248}
249static inline int nfs_fs_proc_init(void)
250{
251 return 0;
252}
253static inline void nfs_fs_proc_exit(void)
254{
255}
256#endif
257
258/* callback_xdr.c */
259extern const struct svc_version nfs4_callback_version1;
260extern const struct svc_version nfs4_callback_version4;
261
262/* fs_context.c */
263extern struct file_system_type nfs_fs_type;
264
265/* pagelist.c */
266extern int __init nfs_init_nfspagecache(void);
267extern void nfs_destroy_nfspagecache(void);
268extern int __init nfs_init_readpagecache(void);
269extern void nfs_destroy_readpagecache(void);
270extern int __init nfs_init_writepagecache(void);
271extern void nfs_destroy_writepagecache(void);
272
273extern int __init nfs_init_directcache(void);
274extern void nfs_destroy_directcache(void);
275extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
276 struct nfs_pgio_header *hdr,
277 void (*release)(struct nfs_pgio_header *hdr));
278void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
279int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
280
281extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
282struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
283void nfs_pgio_header_free(struct nfs_pgio_header *);
284int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
285int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
286 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
287 const struct rpc_call_ops *call_ops, int how, int flags);
288void nfs_free_request(struct nfs_page *req);
289struct nfs_pgio_mirror *
290nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
291
292static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
293 const struct nfs_open_context *ctx2)
294{
295 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
296}
297
298/* nfs2xdr.c */
299extern const struct rpc_procinfo nfs_procedures[];
300extern int nfs2_decode_dirent(struct xdr_stream *,
301 struct nfs_entry *, bool);
302
303/* nfs3xdr.c */
304extern const struct rpc_procinfo nfs3_procedures[];
305extern int nfs3_decode_dirent(struct xdr_stream *,
306 struct nfs_entry *, bool);
307
308/* nfs4xdr.c */
309#if IS_ENABLED(CONFIG_NFS_V4)
310extern int nfs4_decode_dirent(struct xdr_stream *,
311 struct nfs_entry *, bool);
312#endif
313#ifdef CONFIG_NFS_V4_1
314extern const u32 nfs41_maxread_overhead;
315extern const u32 nfs41_maxwrite_overhead;
316extern const u32 nfs41_maxgetdevinfo_overhead;
317#endif
318
319/* nfs4proc.c */
320#if IS_ENABLED(CONFIG_NFS_V4)
321extern const struct rpc_procinfo nfs4_procedures[];
322#endif
323
324#ifdef CONFIG_NFS_V4_SECURITY_LABEL
325extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
326static inline struct nfs4_label *
327nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
328{
329 if (!dst || !src)
330 return NULL;
331
332 if (src->len > NFS4_MAXLABELLEN)
333 return NULL;
334
335 dst->lfs = src->lfs;
336 dst->pi = src->pi;
337 dst->len = src->len;
338 memcpy(dst->label, src->label, src->len);
339
340 return dst;
341}
342static inline void nfs4_label_free(struct nfs4_label *label)
343{
344 if (label) {
345 kfree(label->label);
346 kfree(label);
347 }
348 return;
349}
350
351static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
352{
353 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
354 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
355}
356#else
357static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
358static inline void nfs4_label_free(void *label) {}
359static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
360{
361}
362static inline struct nfs4_label *
363nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
364{
365 return NULL;
366}
367#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
368
369/* proc.c */
370void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
371extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
372 const struct nfs_client_initdata *);
373
374/* dir.c */
375extern void nfs_advise_use_readdirplus(struct inode *dir);
376extern void nfs_force_use_readdirplus(struct inode *dir);
377extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
378 struct shrink_control *sc);
379extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
380 struct shrink_control *sc);
381struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
382int nfs_create(struct user_namespace *, struct inode *, struct dentry *,
383 umode_t, bool);
384int nfs_mkdir(struct user_namespace *, struct inode *, struct dentry *,
385 umode_t);
386int nfs_rmdir(struct inode *, struct dentry *);
387int nfs_unlink(struct inode *, struct dentry *);
388int nfs_symlink(struct user_namespace *, struct inode *, struct dentry *,
389 const char *);
390int nfs_link(struct dentry *, struct inode *, struct dentry *);
391int nfs_mknod(struct user_namespace *, struct inode *, struct dentry *, umode_t,
392 dev_t);
393int nfs_rename(struct user_namespace *, struct inode *, struct dentry *,
394 struct inode *, struct dentry *, unsigned int);
395
396/* file.c */
397int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
398loff_t nfs_file_llseek(struct file *, loff_t, int);
399ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
400int nfs_file_mmap(struct file *, struct vm_area_struct *);
401ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
402int nfs_file_release(struct inode *, struct file *);
403int nfs_lock(struct file *, int, struct file_lock *);
404int nfs_flock(struct file *, int, struct file_lock *);
405int nfs_check_flags(int);
406
407/* inode.c */
408extern struct workqueue_struct *nfsiod_workqueue;
409extern struct inode *nfs_alloc_inode(struct super_block *sb);
410extern void nfs_free_inode(struct inode *);
411extern int nfs_write_inode(struct inode *, struct writeback_control *);
412extern int nfs_drop_inode(struct inode *);
413extern void nfs_clear_inode(struct inode *);
414extern void nfs_evict_inode(struct inode *);
415extern void nfs_zap_acl_cache(struct inode *inode);
416extern void nfs_set_cache_invalid(struct inode *inode, unsigned long flags);
417extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
418extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
419extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
420
421/* super.c */
422extern const struct super_operations nfs_sops;
423bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
424int nfs_try_get_tree(struct fs_context *);
425int nfs_get_tree_common(struct fs_context *);
426void nfs_kill_super(struct super_block *);
427
428extern struct rpc_stat nfs_rpcstat;
429
430extern int __init register_nfs_fs(void);
431extern void __exit unregister_nfs_fs(void);
432extern bool nfs_sb_active(struct super_block *sb);
433extern void nfs_sb_deactive(struct super_block *sb);
434extern int nfs_client_for_each_server(struct nfs_client *clp,
435 int (*fn)(struct nfs_server *, void *),
436 void *data);
437/* io.c */
438extern void nfs_start_io_read(struct inode *inode);
439extern void nfs_end_io_read(struct inode *inode);
440extern void nfs_start_io_write(struct inode *inode);
441extern void nfs_end_io_write(struct inode *inode);
442extern void nfs_start_io_direct(struct inode *inode);
443extern void nfs_end_io_direct(struct inode *inode);
444
445static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
446{
447 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
448}
449
450/* namespace.c */
451#define NFS_PATH_CANONICAL 1
452extern char *nfs_path(char **p, struct dentry *dentry,
453 char *buffer, ssize_t buflen, unsigned flags);
454extern struct vfsmount *nfs_d_automount(struct path *path);
455int nfs_submount(struct fs_context *, struct nfs_server *);
456int nfs_do_submount(struct fs_context *);
457
458/* getroot.c */
459extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
460#if IS_ENABLED(CONFIG_NFS_V4)
461extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
462#endif
463
464struct nfs_pgio_completion_ops;
465/* read.c */
466extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
467 struct inode *inode, bool force_mds,
468 const struct nfs_pgio_completion_ops *compl_ops);
469extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
470extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
471
472/* super.c */
473void nfs_umount_begin(struct super_block *);
474int nfs_statfs(struct dentry *, struct kstatfs *);
475int nfs_show_options(struct seq_file *, struct dentry *);
476int nfs_show_devname(struct seq_file *, struct dentry *);
477int nfs_show_path(struct seq_file *, struct dentry *);
478int nfs_show_stats(struct seq_file *, struct dentry *);
479int nfs_reconfigure(struct fs_context *);
480
481/* write.c */
482extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
483 struct inode *inode, int ioflags, bool force_mds,
484 const struct nfs_pgio_completion_ops *compl_ops);
485extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
486extern void nfs_commit_free(struct nfs_commit_data *p);
487extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
488extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
489extern int nfs_initiate_commit(struct rpc_clnt *clnt,
490 struct nfs_commit_data *data,
491 const struct nfs_rpc_ops *nfs_ops,
492 const struct rpc_call_ops *call_ops,
493 int how, int flags);
494extern void nfs_init_commit(struct nfs_commit_data *data,
495 struct list_head *head,
496 struct pnfs_layout_segment *lseg,
497 struct nfs_commit_info *cinfo);
498int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
499 struct nfs_commit_info *cinfo, int max);
500unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
501int nfs_scan_commit(struct inode *inode, struct list_head *dst,
502 struct nfs_commit_info *cinfo);
503void nfs_mark_request_commit(struct nfs_page *req,
504 struct pnfs_layout_segment *lseg,
505 struct nfs_commit_info *cinfo,
506 u32 ds_commit_idx);
507int nfs_write_need_commit(struct nfs_pgio_header *);
508void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
509int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
510 int how, struct nfs_commit_info *cinfo);
511void nfs_retry_commit(struct list_head *page_list,
512 struct pnfs_layout_segment *lseg,
513 struct nfs_commit_info *cinfo,
514 u32 ds_commit_idx);
515void nfs_commitdata_release(struct nfs_commit_data *data);
516void nfs_request_add_commit_list(struct nfs_page *req,
517 struct nfs_commit_info *cinfo);
518void nfs_request_add_commit_list_locked(struct nfs_page *req,
519 struct list_head *dst,
520 struct nfs_commit_info *cinfo);
521void nfs_request_remove_commit_list(struct nfs_page *req,
522 struct nfs_commit_info *cinfo);
523void nfs_init_cinfo(struct nfs_commit_info *cinfo,
524 struct inode *inode,
525 struct nfs_direct_req *dreq);
526int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
527bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
528void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
529
530int nfs_filemap_write_and_wait_range(struct address_space *mapping,
531 loff_t lstart, loff_t lend);
532
533#ifdef CONFIG_NFS_V4_1
534static inline void
535pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
536 unsigned int nbuckets)
537{
538 unsigned int i;
539
540 for (i = 0; i < nbuckets; i++)
541 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
542}
543static inline
544void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
545{
546 struct pnfs_commit_array *array;
547
548 rcu_read_lock();
549 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
550 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
551 array->nbuckets);
552 rcu_read_unlock();
553}
554#else
555static inline
556void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
557{
558}
559#endif
560
561#ifdef CONFIG_MIGRATION
562extern int nfs_migrate_page(struct address_space *,
563 struct page *, struct page *, enum migrate_mode);
564#endif
565
566static inline int
567nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
568 const struct nfs_write_verifier *v2)
569{
570 return memcmp(v1->data, v2->data, sizeof(v1->data));
571}
572
573static inline bool
574nfs_write_match_verf(const struct nfs_writeverf *verf,
575 struct nfs_page *req)
576{
577 return verf->committed > NFS_UNSTABLE &&
578 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
579}
580
581/* unlink.c */
582extern struct rpc_task *
583nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
584 struct dentry *old_dentry, struct dentry *new_dentry,
585 void (*complete)(struct rpc_task *, struct nfs_renamedata *));
586extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
587
588/* direct.c */
589void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
590 struct nfs_direct_req *dreq);
591extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
592
593/* nfs4proc.c */
594extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
595 const struct nfs_client_initdata *);
596extern int nfs40_walk_client_list(struct nfs_client *clp,
597 struct nfs_client **result,
598 const struct cred *cred);
599extern int nfs41_walk_client_list(struct nfs_client *clp,
600 struct nfs_client **result,
601 const struct cred *cred);
602extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
603 struct rpc_xprt *xprt,
604 void *data);
605
606static inline struct inode *nfs_igrab_and_active(struct inode *inode)
607{
608 struct super_block *sb = inode->i_sb;
609
610 if (sb && nfs_sb_active(sb)) {
611 if (igrab(inode))
612 return inode;
613 nfs_sb_deactive(sb);
614 }
615 return NULL;
616}
617
618static inline void nfs_iput_and_deactive(struct inode *inode)
619{
620 if (inode != NULL) {
621 struct super_block *sb = inode->i_sb;
622
623 iput(inode);
624 nfs_sb_deactive(sb);
625 }
626}
627
628/*
629 * Determine the device name as a string
630 */
631static inline char *nfs_devname(struct dentry *dentry,
632 char *buffer, ssize_t buflen)
633{
634 char *dummy;
635 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
636}
637
638/*
639 * Determine the actual block size (and log2 thereof)
640 */
641static inline
642unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
643{
644 /* make sure blocksize is a power of two */
645 if ((bsize & (bsize - 1)) || nrbitsp) {
646 unsigned char nrbits;
647
648 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
649 ;
650 bsize = 1 << nrbits;
651 if (nrbitsp)
652 *nrbitsp = nrbits;
653 }
654
655 return bsize;
656}
657
658/*
659 * Calculate the number of 512byte blocks used.
660 */
661static inline blkcnt_t nfs_calc_block_size(u64 tsize)
662{
663 blkcnt_t used = (tsize + 511) >> 9;
664 return (used > ULONG_MAX) ? ULONG_MAX : used;
665}
666
667/*
668 * Compute and set NFS server blocksize
669 */
670static inline
671unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
672{
673 if (bsize < NFS_MIN_FILE_IO_SIZE)
674 bsize = NFS_DEF_FILE_IO_SIZE;
675 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
676 bsize = NFS_MAX_FILE_IO_SIZE;
677
678 return nfs_block_bits(bsize, nrbitsp);
679}
680
681/*
682 * Determine the maximum file size for a superblock
683 */
684static inline
685void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
686{
687 sb->s_maxbytes = (loff_t)maxfilesize;
688 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
689 sb->s_maxbytes = MAX_LFS_FILESIZE;
690}
691
692/*
693 * Record the page as unstable (an extra writeback period) and mark its
694 * inode as dirty.
695 */
696static inline
697void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
698{
699 if (!cinfo->dreq) {
700 struct inode *inode = page_file_mapping(page)->host;
701
702 /* This page is really still in write-back - just that the
703 * writeback is happening on the server now.
704 */
705 inc_node_page_state(page, NR_WRITEBACK);
706 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
707 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
708 }
709}
710
711/*
712 * Determine the number of bytes of data the page contains
713 */
714static inline
715unsigned int nfs_page_length(struct page *page)
716{
717 loff_t i_size = i_size_read(page_file_mapping(page)->host);
718
719 if (i_size > 0) {
720 pgoff_t index = page_index(page);
721 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
722 if (index < end_index)
723 return PAGE_SIZE;
724 if (index == end_index)
725 return ((i_size - 1) & ~PAGE_MASK) + 1;
726 }
727 return 0;
728}
729
730/*
731 * Convert a umode to a dirent->d_type
732 */
733static inline
734unsigned char nfs_umode_to_dtype(umode_t mode)
735{
736 return (mode >> 12) & 15;
737}
738
739/*
740 * Determine the number of pages in an array of length 'len' and
741 * with a base offset of 'base'
742 */
743static inline
744unsigned int nfs_page_array_len(unsigned int base, size_t len)
745{
746 return ((unsigned long)len + (unsigned long)base +
747 PAGE_SIZE - 1) >> PAGE_SHIFT;
748}
749
750/*
751 * Convert a struct timespec64 into a 64-bit change attribute
752 *
753 * This does approximately the same thing as timespec64_to_ns(),
754 * but for calculation efficiency, we multiply the seconds by
755 * 1024*1024*1024.
756 */
757static inline
758u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
759{
760 return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
761}
762
763#ifdef CONFIG_CRC32
764/**
765 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
766 * @fh - pointer to filehandle
767 *
768 * returns a crc32 hash for the filehandle that is compatible with
769 * the one displayed by "wireshark".
770 */
771static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
772{
773 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
774}
775static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
776{
777 return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
778 NFS4_STATEID_OTHER_SIZE);
779}
780#else
781static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
782{
783 return 0;
784}
785static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
786{
787 return 0;
788}
789#endif
790
791static inline bool nfs_error_is_fatal(int err)
792{
793 switch (err) {
794 case -ERESTARTSYS:
795 case -EINTR:
796 case -EACCES:
797 case -EDQUOT:
798 case -EFBIG:
799 case -EIO:
800 case -ENOSPC:
801 case -EROFS:
802 case -ESTALE:
803 case -E2BIG:
804 case -ENOMEM:
805 case -ETIMEDOUT:
806 return true;
807 default:
808 return false;
809 }
810}
811
812static inline bool nfs_error_is_fatal_on_server(int err)
813{
814 switch (err) {
815 case 0:
816 case -ERESTARTSYS:
817 case -EINTR:
818 return false;
819 }
820 return nfs_error_is_fatal(err);
821}
822
823/*
824 * Select between a default port value and a user-specified port value.
825 * If a zero value is set, then autobind will be used.
826 */
827static inline void nfs_set_port(struct sockaddr *sap, int *port,
828 const unsigned short default_port)
829{
830 if (*port == NFS_UNSPEC_PORT)
831 *port = default_port;
832
833 rpc_set_port(sap, *port);
834}
1/*
2 * NFS internal definitions
3 */
4
5#include "nfs4_fs.h"
6#include <linux/mount.h>
7#include <linux/security.h>
8
9#define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
10
11struct nfs_string;
12
13/* Maximum number of readahead requests
14 * FIXME: this should really be a sysctl so that users may tune it to suit
15 * their needs. People that do NFS over a slow network, might for
16 * instance want to reduce it to something closer to 1 for improved
17 * interactive response.
18 */
19#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
20
21/*
22 * Determine if sessions are in use.
23 */
24static inline int nfs4_has_session(const struct nfs_client *clp)
25{
26#ifdef CONFIG_NFS_V4_1
27 if (clp->cl_session)
28 return 1;
29#endif /* CONFIG_NFS_V4_1 */
30 return 0;
31}
32
33static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
34{
35#ifdef CONFIG_NFS_V4_1
36 if (nfs4_has_session(clp))
37 return (clp->cl_session->flags & SESSION4_PERSIST);
38#endif /* CONFIG_NFS_V4_1 */
39 return 0;
40}
41
42static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
43{
44 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
45 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
46}
47
48static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
49{
50 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
51 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
52 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
53 return 0;
54
55 fattr->fileid = fattr->mounted_on_fileid;
56 return 1;
57}
58
59struct nfs_clone_mount {
60 const struct super_block *sb;
61 const struct dentry *dentry;
62 struct nfs_fh *fh;
63 struct nfs_fattr *fattr;
64 char *hostname;
65 char *mnt_path;
66 struct sockaddr *addr;
67 size_t addrlen;
68 rpc_authflavor_t authflavor;
69};
70
71/*
72 * Note: RFC 1813 doesn't limit the number of auth flavors that
73 * a server can return, so make something up.
74 */
75#define NFS_MAX_SECFLAVORS (12)
76
77/*
78 * Value used if the user did not specify a port value.
79 */
80#define NFS_UNSPEC_PORT (-1)
81
82/*
83 * Maximum number of pages that readdir can use for creating
84 * a vmapped array of pages.
85 */
86#define NFS_MAX_READDIR_PAGES 8
87
88/*
89 * In-kernel mount arguments
90 */
91struct nfs_parsed_mount_data {
92 int flags;
93 int rsize, wsize;
94 int timeo, retrans;
95 int acregmin, acregmax,
96 acdirmin, acdirmax;
97 int namlen;
98 unsigned int options;
99 unsigned int bsize;
100 unsigned int auth_flavor_len;
101 rpc_authflavor_t auth_flavors[1];
102 char *client_address;
103 unsigned int version;
104 unsigned int minorversion;
105 char *fscache_uniq;
106
107 struct {
108 struct sockaddr_storage address;
109 size_t addrlen;
110 char *hostname;
111 u32 version;
112 int port;
113 unsigned short protocol;
114 } mount_server;
115
116 struct {
117 struct sockaddr_storage address;
118 size_t addrlen;
119 char *hostname;
120 char *export_path;
121 int port;
122 unsigned short protocol;
123 } nfs_server;
124
125 struct security_mnt_opts lsm_opts;
126};
127
128/* mount_clnt.c */
129struct nfs_mount_request {
130 struct sockaddr *sap;
131 size_t salen;
132 char *hostname;
133 char *dirpath;
134 u32 version;
135 unsigned short protocol;
136 struct nfs_fh *fh;
137 int noresvport;
138 unsigned int *auth_flav_len;
139 rpc_authflavor_t *auth_flavs;
140};
141
142extern int nfs_mount(struct nfs_mount_request *info);
143extern void nfs_umount(const struct nfs_mount_request *info);
144
145/* client.c */
146extern struct rpc_program nfs_program;
147
148extern void nfs_cleanup_cb_ident_idr(void);
149extern void nfs_put_client(struct nfs_client *);
150extern struct nfs_client *nfs4_find_client_no_ident(const struct sockaddr *);
151extern struct nfs_client *nfs4_find_client_ident(int);
152extern struct nfs_client *
153nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
154extern struct nfs_server *nfs_create_server(
155 const struct nfs_parsed_mount_data *,
156 struct nfs_fh *);
157extern struct nfs_server *nfs4_create_server(
158 const struct nfs_parsed_mount_data *,
159 struct nfs_fh *);
160extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
161 struct nfs_fh *);
162extern void nfs_free_server(struct nfs_server *server);
163extern struct nfs_server *nfs_clone_server(struct nfs_server *,
164 struct nfs_fh *,
165 struct nfs_fattr *);
166extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
167extern int nfs4_check_client_ready(struct nfs_client *clp);
168extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
169 const struct sockaddr *ds_addr,
170 int ds_addrlen, int ds_proto);
171#ifdef CONFIG_PROC_FS
172extern int __init nfs_fs_proc_init(void);
173extern void nfs_fs_proc_exit(void);
174#else
175static inline int nfs_fs_proc_init(void)
176{
177 return 0;
178}
179static inline void nfs_fs_proc_exit(void)
180{
181}
182#endif
183
184/* nfs4namespace.c */
185#ifdef CONFIG_NFS_V4
186extern struct vfsmount *nfs_do_refmount(struct dentry *dentry);
187#else
188static inline
189struct vfsmount *nfs_do_refmount(struct dentry *dentry)
190{
191 return ERR_PTR(-ENOENT);
192}
193#endif
194
195/* callback_xdr.c */
196extern struct svc_version nfs4_callback_version1;
197extern struct svc_version nfs4_callback_version4;
198
199/* pagelist.c */
200extern int __init nfs_init_nfspagecache(void);
201extern void nfs_destroy_nfspagecache(void);
202extern int __init nfs_init_readpagecache(void);
203extern void nfs_destroy_readpagecache(void);
204extern int __init nfs_init_writepagecache(void);
205extern void nfs_destroy_writepagecache(void);
206
207extern int __init nfs_init_directcache(void);
208extern void nfs_destroy_directcache(void);
209
210/* nfs2xdr.c */
211extern int nfs_stat_to_errno(enum nfs_stat);
212extern struct rpc_procinfo nfs_procedures[];
213extern int nfs2_decode_dirent(struct xdr_stream *,
214 struct nfs_entry *, int);
215
216/* nfs3xdr.c */
217extern struct rpc_procinfo nfs3_procedures[];
218extern int nfs3_decode_dirent(struct xdr_stream *,
219 struct nfs_entry *, int);
220
221/* nfs4xdr.c */
222#ifdef CONFIG_NFS_V4
223extern int nfs4_decode_dirent(struct xdr_stream *,
224 struct nfs_entry *, int);
225#endif
226#ifdef CONFIG_NFS_V4_1
227extern const u32 nfs41_maxread_overhead;
228extern const u32 nfs41_maxwrite_overhead;
229#endif
230
231/* nfs4proc.c */
232#ifdef CONFIG_NFS_V4
233extern struct rpc_procinfo nfs4_procedures[];
234void nfs_fixup_secinfo_attributes(struct nfs_fattr *, struct nfs_fh *);
235#endif
236
237extern int nfs4_init_ds_session(struct nfs_client *clp);
238
239/* proc.c */
240void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
241extern int nfs_init_client(struct nfs_client *clp,
242 const struct rpc_timeout *timeparms,
243 const char *ip_addr, rpc_authflavor_t authflavour,
244 int noresvport);
245
246/* dir.c */
247extern int nfs_access_cache_shrinker(struct shrinker *shrink,
248 struct shrink_control *sc);
249
250/* inode.c */
251extern struct workqueue_struct *nfsiod_workqueue;
252extern struct inode *nfs_alloc_inode(struct super_block *sb);
253extern void nfs_destroy_inode(struct inode *);
254extern int nfs_write_inode(struct inode *, struct writeback_control *);
255extern void nfs_evict_inode(struct inode *);
256#ifdef CONFIG_NFS_V4
257extern void nfs4_evict_inode(struct inode *);
258#endif
259void nfs_zap_acl_cache(struct inode *inode);
260extern int nfs_wait_bit_killable(void *word);
261
262/* super.c */
263extern struct file_system_type nfs_xdev_fs_type;
264#ifdef CONFIG_NFS_V4
265extern struct file_system_type nfs4_xdev_fs_type;
266extern struct file_system_type nfs4_referral_fs_type;
267#endif
268
269extern struct rpc_stat nfs_rpcstat;
270
271extern int __init register_nfs_fs(void);
272extern void __exit unregister_nfs_fs(void);
273extern void nfs_sb_active(struct super_block *sb);
274extern void nfs_sb_deactive(struct super_block *sb);
275
276/* namespace.c */
277extern char *nfs_path(char **p, struct dentry *dentry,
278 char *buffer, ssize_t buflen);
279extern struct vfsmount *nfs_d_automount(struct path *path);
280#ifdef CONFIG_NFS_V4
281rpc_authflavor_t nfs_find_best_sec(struct nfs4_secinfo_flavors *);
282#endif
283
284/* getroot.c */
285extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
286 const char *);
287#ifdef CONFIG_NFS_V4
288extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
289 const char *);
290
291extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
292#endif
293
294struct nfs_pageio_descriptor;
295/* read.c */
296extern int nfs_initiate_read(struct nfs_read_data *data, struct rpc_clnt *clnt,
297 const struct rpc_call_ops *call_ops);
298extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
299extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
300 struct list_head *head);
301
302extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
303extern void nfs_readdata_release(struct nfs_read_data *rdata);
304
305/* write.c */
306extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
307 struct list_head *head);
308extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
309extern void nfs_writedata_release(struct nfs_write_data *wdata);
310extern void nfs_commit_free(struct nfs_write_data *p);
311extern int nfs_initiate_write(struct nfs_write_data *data,
312 struct rpc_clnt *clnt,
313 const struct rpc_call_ops *call_ops,
314 int how);
315extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
316extern int nfs_initiate_commit(struct nfs_write_data *data,
317 struct rpc_clnt *clnt,
318 const struct rpc_call_ops *call_ops,
319 int how);
320extern void nfs_init_commit(struct nfs_write_data *data,
321 struct list_head *head,
322 struct pnfs_layout_segment *lseg);
323void nfs_retry_commit(struct list_head *page_list,
324 struct pnfs_layout_segment *lseg);
325void nfs_commit_clear_lock(struct nfs_inode *nfsi);
326void nfs_commitdata_release(void *data);
327void nfs_commit_release_pages(struct nfs_write_data *data);
328
329#ifdef CONFIG_MIGRATION
330extern int nfs_migrate_page(struct address_space *,
331 struct page *, struct page *);
332#else
333#define nfs_migrate_page NULL
334#endif
335
336/* nfs4proc.c */
337extern void __nfs4_read_done_cb(struct nfs_read_data *);
338extern void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data);
339extern int nfs4_init_client(struct nfs_client *clp,
340 const struct rpc_timeout *timeparms,
341 const char *ip_addr,
342 rpc_authflavor_t authflavour,
343 int noresvport);
344extern void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data);
345extern int _nfs4_call_sync(struct rpc_clnt *clnt,
346 struct nfs_server *server,
347 struct rpc_message *msg,
348 struct nfs4_sequence_args *args,
349 struct nfs4_sequence_res *res,
350 int cache_reply);
351extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
352 struct nfs_server *server,
353 struct rpc_message *msg,
354 struct nfs4_sequence_args *args,
355 struct nfs4_sequence_res *res,
356 int cache_reply);
357
358/*
359 * Determine the device name as a string
360 */
361static inline char *nfs_devname(struct dentry *dentry,
362 char *buffer, ssize_t buflen)
363{
364 char *dummy;
365 return nfs_path(&dummy, dentry, buffer, buflen);
366}
367
368/*
369 * Determine the actual block size (and log2 thereof)
370 */
371static inline
372unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
373{
374 /* make sure blocksize is a power of two */
375 if ((bsize & (bsize - 1)) || nrbitsp) {
376 unsigned char nrbits;
377
378 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
379 ;
380 bsize = 1 << nrbits;
381 if (nrbitsp)
382 *nrbitsp = nrbits;
383 }
384
385 return bsize;
386}
387
388/*
389 * Calculate the number of 512byte blocks used.
390 */
391static inline blkcnt_t nfs_calc_block_size(u64 tsize)
392{
393 blkcnt_t used = (tsize + 511) >> 9;
394 return (used > ULONG_MAX) ? ULONG_MAX : used;
395}
396
397/*
398 * Compute and set NFS server blocksize
399 */
400static inline
401unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
402{
403 if (bsize < NFS_MIN_FILE_IO_SIZE)
404 bsize = NFS_DEF_FILE_IO_SIZE;
405 else if (bsize >= NFS_MAX_FILE_IO_SIZE)
406 bsize = NFS_MAX_FILE_IO_SIZE;
407
408 return nfs_block_bits(bsize, nrbitsp);
409}
410
411/*
412 * Determine the maximum file size for a superblock
413 */
414static inline
415void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
416{
417 sb->s_maxbytes = (loff_t)maxfilesize;
418 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
419 sb->s_maxbytes = MAX_LFS_FILESIZE;
420}
421
422/*
423 * Determine the number of bytes of data the page contains
424 */
425static inline
426unsigned int nfs_page_length(struct page *page)
427{
428 loff_t i_size = i_size_read(page->mapping->host);
429
430 if (i_size > 0) {
431 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
432 if (page->index < end_index)
433 return PAGE_CACHE_SIZE;
434 if (page->index == end_index)
435 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
436 }
437 return 0;
438}
439
440/*
441 * Convert a umode to a dirent->d_type
442 */
443static inline
444unsigned char nfs_umode_to_dtype(umode_t mode)
445{
446 return (mode >> 12) & 15;
447}
448
449/*
450 * Determine the number of pages in an array of length 'len' and
451 * with a base offset of 'base'
452 */
453static inline
454unsigned int nfs_page_array_len(unsigned int base, size_t len)
455{
456 return ((unsigned long)len + (unsigned long)base +
457 PAGE_SIZE - 1) >> PAGE_SHIFT;
458}
459
460/*
461 * Helper for restarting RPC calls in the possible presence of NFSv4.1
462 * sessions.
463 */
464static inline int nfs_restart_rpc(struct rpc_task *task, const struct nfs_client *clp)
465{
466 if (nfs4_has_session(clp))
467 return rpc_restart_call_prepare(task);
468 return rpc_restart_call(task);
469}