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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/mount.h>
8#include <linux/security.h>
9#include <linux/crc32.h>
10#include <linux/nfs_page.h>
11#include <linux/wait_bit.h>
12
13#define NFS_MS_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS)
14
15extern const struct export_operations nfs_export_ops;
16
17struct nfs_string;
18
19/* Maximum number of readahead requests
20 * FIXME: this should really be a sysctl so that users may tune it to suit
21 * their needs. People that do NFS over a slow network, might for
22 * instance want to reduce it to something closer to 1 for improved
23 * interactive response.
24 */
25#define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1)
26
27static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
28{
29 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
30 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
31}
32
33static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
34{
35 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
36 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
37 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
38 return 0;
39 return 1;
40}
41
42struct nfs_clone_mount {
43 const struct super_block *sb;
44 const struct dentry *dentry;
45 struct nfs_fh *fh;
46 struct nfs_fattr *fattr;
47 char *hostname;
48 char *mnt_path;
49 struct sockaddr *addr;
50 size_t addrlen;
51 rpc_authflavor_t authflavor;
52};
53
54/*
55 * Note: RFC 1813 doesn't limit the number of auth flavors that
56 * a server can return, so make something up.
57 */
58#define NFS_MAX_SECFLAVORS (12)
59
60/*
61 * Value used if the user did not specify a port value.
62 */
63#define NFS_UNSPEC_PORT (-1)
64
65#define NFS_UNSPEC_RETRANS (UINT_MAX)
66#define NFS_UNSPEC_TIMEO (UINT_MAX)
67
68/*
69 * Maximum number of pages that readdir can use for creating
70 * a vmapped array of pages.
71 */
72#define NFS_MAX_READDIR_PAGES 64
73#define NFS_MAX_READDIR_RAPAGES 8
74
75struct nfs_client_initdata {
76 unsigned long init_flags;
77 const char *hostname; /* Hostname of the server */
78 const struct sockaddr *addr; /* Address of the server */
79 const char *nodename; /* Hostname of the client */
80 const char *ip_addr; /* IP address of the client */
81 size_t addrlen;
82 struct nfs_subversion *nfs_mod;
83 int proto;
84 u32 minorversion;
85 struct net *net;
86 const struct rpc_timeout *timeparms;
87};
88
89/*
90 * In-kernel mount arguments
91 */
92struct nfs_parsed_mount_data {
93 int flags;
94 unsigned int rsize, wsize;
95 unsigned int timeo, retrans;
96 unsigned int acregmin, acregmax,
97 acdirmin, acdirmax;
98 unsigned int namlen;
99 unsigned int options;
100 unsigned int bsize;
101 struct nfs_auth_info auth_info;
102 rpc_authflavor_t selected_flavor;
103 char *client_address;
104 unsigned int version;
105 unsigned int minorversion;
106 char *fscache_uniq;
107 bool need_mount;
108
109 struct {
110 struct sockaddr_storage address;
111 size_t addrlen;
112 char *hostname;
113 u32 version;
114 int port;
115 unsigned short protocol;
116 } mount_server;
117
118 struct {
119 struct sockaddr_storage address;
120 size_t addrlen;
121 char *hostname;
122 char *export_path;
123 int port;
124 unsigned short protocol;
125 } nfs_server;
126
127 void *lsm_opts;
128 struct net *net;
129};
130
131/* mount_clnt.c */
132struct nfs_mount_request {
133 struct sockaddr *sap;
134 size_t salen;
135 char *hostname;
136 char *dirpath;
137 u32 version;
138 unsigned short protocol;
139 struct nfs_fh *fh;
140 int noresvport;
141 unsigned int *auth_flav_len;
142 rpc_authflavor_t *auth_flavs;
143 struct net *net;
144};
145
146struct nfs_mount_info {
147 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
148 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
149 struct nfs_parsed_mount_data *parsed;
150 struct nfs_clone_mount *cloned;
151 struct nfs_fh *mntfh;
152};
153
154extern int nfs_mount(struct nfs_mount_request *info);
155extern void nfs_umount(const struct nfs_mount_request *info);
156
157/* client.c */
158extern const struct rpc_program nfs_program;
159extern void nfs_clients_init(struct net *net);
160extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
161int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
162struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
163int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
164void nfs_server_insert_lists(struct nfs_server *);
165void nfs_server_remove_lists(struct nfs_server *);
166void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
167int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
168 rpc_authflavor_t);
169struct nfs_server *nfs_alloc_server(void);
170void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
171
172extern void nfs_cleanup_cb_ident_idr(struct net *);
173extern void nfs_put_client(struct nfs_client *);
174extern void nfs_free_client(struct nfs_client *);
175extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
176extern struct nfs_client *
177nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
178 struct nfs4_sessionid *, u32);
179extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
180 struct nfs_subversion *);
181extern struct nfs_server *nfs4_create_server(
182 struct nfs_mount_info *,
183 struct nfs_subversion *);
184extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
185 struct nfs_fh *);
186extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
187 struct sockaddr *sap, size_t salen,
188 struct net *net);
189extern void nfs_free_server(struct nfs_server *server);
190extern struct nfs_server *nfs_clone_server(struct nfs_server *,
191 struct nfs_fh *,
192 struct nfs_fattr *,
193 rpc_authflavor_t);
194extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
195extern int nfs_client_init_status(const struct nfs_client *clp);
196extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
197extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
198extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
199 const struct sockaddr *ds_addr,
200 int ds_addrlen, int ds_proto,
201 unsigned int ds_timeo,
202 unsigned int ds_retrans,
203 u32 minor_version);
204extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
205 struct inode *);
206extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
207 const struct sockaddr *ds_addr, int ds_addrlen,
208 int ds_proto, unsigned int ds_timeo,
209 unsigned int ds_retrans);
210#ifdef CONFIG_PROC_FS
211extern int __init nfs_fs_proc_init(void);
212extern void nfs_fs_proc_exit(void);
213extern int nfs_fs_proc_net_init(struct net *net);
214extern void nfs_fs_proc_net_exit(struct net *net);
215#else
216static inline int nfs_fs_proc_net_init(struct net *net)
217{
218 return 0;
219}
220static inline void nfs_fs_proc_net_exit(struct net *net)
221{
222}
223static inline int nfs_fs_proc_init(void)
224{
225 return 0;
226}
227static inline void nfs_fs_proc_exit(void)
228{
229}
230#endif
231
232/* callback_xdr.c */
233extern const struct svc_version nfs4_callback_version1;
234extern const struct svc_version nfs4_callback_version4;
235
236struct nfs_pageio_descriptor;
237/* pagelist.c */
238extern int __init nfs_init_nfspagecache(void);
239extern void nfs_destroy_nfspagecache(void);
240extern int __init nfs_init_readpagecache(void);
241extern void nfs_destroy_readpagecache(void);
242extern int __init nfs_init_writepagecache(void);
243extern void nfs_destroy_writepagecache(void);
244
245extern int __init nfs_init_directcache(void);
246extern void nfs_destroy_directcache(void);
247extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
248 struct nfs_pgio_header *hdr,
249 void (*release)(struct nfs_pgio_header *hdr));
250void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
251int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
252
253extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
254struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
255void nfs_pgio_header_free(struct nfs_pgio_header *);
256int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
257int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
258 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
259 const struct rpc_call_ops *call_ops, int how, int flags);
260void nfs_free_request(struct nfs_page *req);
261struct nfs_pgio_mirror *
262nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
263
264static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
265{
266 WARN_ON_ONCE(desc->pg_mirror_count < 1);
267 return desc->pg_mirror_count > 1;
268}
269
270static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
271 const struct nfs_open_context *ctx2)
272{
273 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
274}
275
276/* nfs2xdr.c */
277extern const struct rpc_procinfo nfs_procedures[];
278extern int nfs2_decode_dirent(struct xdr_stream *,
279 struct nfs_entry *, bool);
280
281/* nfs3xdr.c */
282extern const struct rpc_procinfo nfs3_procedures[];
283extern int nfs3_decode_dirent(struct xdr_stream *,
284 struct nfs_entry *, bool);
285
286/* nfs4xdr.c */
287#if IS_ENABLED(CONFIG_NFS_V4)
288extern int nfs4_decode_dirent(struct xdr_stream *,
289 struct nfs_entry *, bool);
290#endif
291#ifdef CONFIG_NFS_V4_1
292extern const u32 nfs41_maxread_overhead;
293extern const u32 nfs41_maxwrite_overhead;
294extern const u32 nfs41_maxgetdevinfo_overhead;
295#endif
296
297/* nfs4proc.c */
298#if IS_ENABLED(CONFIG_NFS_V4)
299extern const struct rpc_procinfo nfs4_procedures[];
300#endif
301
302#ifdef CONFIG_NFS_V4_SECURITY_LABEL
303extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
304static inline struct nfs4_label *
305nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
306{
307 if (!dst || !src)
308 return NULL;
309
310 if (src->len > NFS4_MAXLABELLEN)
311 return NULL;
312
313 dst->lfs = src->lfs;
314 dst->pi = src->pi;
315 dst->len = src->len;
316 memcpy(dst->label, src->label, src->len);
317
318 return dst;
319}
320static inline void nfs4_label_free(struct nfs4_label *label)
321{
322 if (label) {
323 kfree(label->label);
324 kfree(label);
325 }
326 return;
327}
328
329static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
330{
331 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
332 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
333}
334#else
335static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
336static inline void nfs4_label_free(void *label) {}
337static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
338{
339}
340static inline struct nfs4_label *
341nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
342{
343 return NULL;
344}
345#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
346
347/* proc.c */
348void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
349extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
350 const struct nfs_client_initdata *);
351
352/* dir.c */
353extern void nfs_advise_use_readdirplus(struct inode *dir);
354extern void nfs_force_use_readdirplus(struct inode *dir);
355extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
356 struct shrink_control *sc);
357extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
358 struct shrink_control *sc);
359struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
360int nfs_create(struct inode *, struct dentry *, umode_t, bool);
361int nfs_mkdir(struct inode *, struct dentry *, umode_t);
362int nfs_rmdir(struct inode *, struct dentry *);
363int nfs_unlink(struct inode *, struct dentry *);
364int nfs_symlink(struct inode *, struct dentry *, const char *);
365int nfs_link(struct dentry *, struct inode *, struct dentry *);
366int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
367int nfs_rename(struct inode *, struct dentry *,
368 struct inode *, struct dentry *, unsigned int);
369
370/* file.c */
371int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
372loff_t nfs_file_llseek(struct file *, loff_t, int);
373ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
374int nfs_file_mmap(struct file *, struct vm_area_struct *);
375ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
376int nfs_file_release(struct inode *, struct file *);
377int nfs_lock(struct file *, int, struct file_lock *);
378int nfs_flock(struct file *, int, struct file_lock *);
379int nfs_check_flags(int);
380
381/* inode.c */
382extern struct workqueue_struct *nfsiod_workqueue;
383extern struct inode *nfs_alloc_inode(struct super_block *sb);
384extern void nfs_destroy_inode(struct inode *);
385extern int nfs_write_inode(struct inode *, struct writeback_control *);
386extern int nfs_drop_inode(struct inode *);
387extern void nfs_clear_inode(struct inode *);
388extern void nfs_evict_inode(struct inode *);
389void nfs_zap_acl_cache(struct inode *inode);
390extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
391extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
392extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
393
394/* super.c */
395extern const struct super_operations nfs_sops;
396extern struct file_system_type nfs_fs_type;
397extern struct file_system_type nfs_xdev_fs_type;
398#if IS_ENABLED(CONFIG_NFS_V4)
399extern struct file_system_type nfs4_referral_fs_type;
400#endif
401bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
402struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
403 struct nfs_subversion *);
404int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
405int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
406struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
407 struct nfs_mount_info *, struct nfs_subversion *);
408struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
409struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
410 const char *, struct nfs_mount_info *);
411void nfs_kill_super(struct super_block *);
412void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
413
414extern struct rpc_stat nfs_rpcstat;
415
416extern int __init register_nfs_fs(void);
417extern void __exit unregister_nfs_fs(void);
418extern bool nfs_sb_active(struct super_block *sb);
419extern void nfs_sb_deactive(struct super_block *sb);
420
421/* io.c */
422extern void nfs_start_io_read(struct inode *inode);
423extern void nfs_end_io_read(struct inode *inode);
424extern void nfs_start_io_write(struct inode *inode);
425extern void nfs_end_io_write(struct inode *inode);
426extern void nfs_start_io_direct(struct inode *inode);
427extern void nfs_end_io_direct(struct inode *inode);
428
429static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
430{
431 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
432}
433
434/* namespace.c */
435#define NFS_PATH_CANONICAL 1
436extern char *nfs_path(char **p, struct dentry *dentry,
437 char *buffer, ssize_t buflen, unsigned flags);
438extern struct vfsmount *nfs_d_automount(struct path *path);
439struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
440 struct nfs_fh *, struct nfs_fattr *);
441struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
442 struct nfs_fattr *, rpc_authflavor_t);
443
444/* getroot.c */
445extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
446 const char *);
447#if IS_ENABLED(CONFIG_NFS_V4)
448extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
449 const char *);
450
451extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
452#endif
453
454struct nfs_pgio_completion_ops;
455/* read.c */
456extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
457 struct inode *inode, bool force_mds,
458 const struct nfs_pgio_completion_ops *compl_ops);
459extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
460extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
461
462/* super.c */
463void nfs_umount_begin(struct super_block *);
464int nfs_statfs(struct dentry *, struct kstatfs *);
465int nfs_show_options(struct seq_file *, struct dentry *);
466int nfs_show_devname(struct seq_file *, struct dentry *);
467int nfs_show_path(struct seq_file *, struct dentry *);
468int nfs_show_stats(struct seq_file *, struct dentry *);
469int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
470
471/* write.c */
472extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
473 struct inode *inode, int ioflags, bool force_mds,
474 const struct nfs_pgio_completion_ops *compl_ops);
475extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
476extern void nfs_commit_free(struct nfs_commit_data *p);
477extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
478extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
479extern int nfs_initiate_commit(struct rpc_clnt *clnt,
480 struct nfs_commit_data *data,
481 const struct nfs_rpc_ops *nfs_ops,
482 const struct rpc_call_ops *call_ops,
483 int how, int flags);
484extern void nfs_init_commit(struct nfs_commit_data *data,
485 struct list_head *head,
486 struct pnfs_layout_segment *lseg,
487 struct nfs_commit_info *cinfo);
488int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
489 struct nfs_commit_info *cinfo, int max);
490unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
491int nfs_scan_commit(struct inode *inode, struct list_head *dst,
492 struct nfs_commit_info *cinfo);
493void nfs_mark_request_commit(struct nfs_page *req,
494 struct pnfs_layout_segment *lseg,
495 struct nfs_commit_info *cinfo,
496 u32 ds_commit_idx);
497int nfs_write_need_commit(struct nfs_pgio_header *);
498void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
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/* unlink.c */
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/* direct.c */
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/* nfs4proc.c */
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 const struct cred *cred);
569extern int nfs41_walk_client_list(struct nfs_client *clp,
570 struct nfs_client **result,
571 const struct cred *cred);
572extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
573 struct rpc_xprt *xprt,
574 void *data);
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 * Determine the device name as a string
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 * Determine the actual block size (and log2 thereof)
608 */
609static inline
610unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
611{
612 /* make sure blocksize is a power of two */
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 * Calculate the number of 512byte blocks used.
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 * Compute and set NFS server blocksize
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 * Determine the maximum file size for a superblock
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 * Record the page as unstable and mark its inode as dirty.
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 * Determine the number of bytes of data the page contains
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 * Convert a umode to a dirent->d_type
696 */
697static inline
698unsigned char nfs_umode_to_dtype(umode_t mode)
699{
700 return (mode >> 12) & 15;
701}
702
703/*
704 * Determine the number of pages in an array of length 'len' and
705 * with a base offset of 'base'
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 * Convert a struct timespec into a 64-bit change attribute
716 *
717 * This does approximately the same thing as timespec_to_ns(),
718 * but for calculation efficiency, we multiply the seconds by
719 * 1024*1024*1024.
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 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
730 * @fh - pointer to filehandle
731 *
732 * returns a crc32 hash for the filehandle that is compatible with
733 * the one displayed by "wireshark".
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 -EINTR:
760 case -EACCES:
761 case -EDQUOT:
762 case -EFBIG:
763 case -EIO:
764 case -ENOSPC:
765 case -EROFS:
766 case -ESTALE:
767 case -E2BIG:
768 case -ENOMEM:
769 return true;
770 default:
771 return false;
772 }
773}
774
775static inline void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
776{
777 ctx->error = error;
778 smp_wmb();
779 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
780}