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Linux 4.19.133
[linux/fpc-iii.git] / fs / nfs / internal.h
blob8357ff69962f22caae59d1ac357058d89800e963
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
15 extern const struct export_operations nfs_export_ops;
16
17 struct 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
27 static 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
33 static 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
42 struct 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 8
73
74 struct nfs_client_initdata {
75 unsigned long init_flags;
76 const char *hostname; /* Hostname of the server */
77 const struct sockaddr *addr; /* Address of the server */
78 const char *nodename; /* Hostname of the client */
79 const char *ip_addr; /* IP address of the client */
80 size_t addrlen;
81 struct nfs_subversion *nfs_mod;
82 int proto;
83 u32 minorversion;
84 struct net *net;
85 const struct rpc_timeout *timeparms;
86 };
87
88 /*
89 * In-kernel mount arguments
90 */
91 struct nfs_parsed_mount_data {
92 int flags;
93 unsigned int rsize, wsize;
94 unsigned int timeo, retrans;
95 unsigned int acregmin, acregmax,
96 acdirmin, acdirmax;
97 unsigned int namlen;
98 unsigned int options;
99 unsigned int bsize;
100 struct nfs_auth_info auth_info;
101 rpc_authflavor_t selected_flavor;
102 char *client_address;
103 unsigned int version;
104 unsigned int minorversion;
105 char *fscache_uniq;
106 bool need_mount;
107
108 struct {
109 struct sockaddr_storage address;
110 size_t addrlen;
111 char *hostname;
112 u32 version;
113 int port;
114 unsigned short protocol;
115 } mount_server;
116
117 struct {
118 struct sockaddr_storage address;
119 size_t addrlen;
120 char *hostname;
121 char *export_path;
122 int port;
123 unsigned short protocol;
124 } nfs_server;
125
126 struct security_mnt_opts lsm_opts;
127 struct net *net;
128 };
129
130 /* mount_clnt.c */
131 struct nfs_mount_request {
132 struct sockaddr *sap;
133 size_t salen;
134 char *hostname;
135 char *dirpath;
136 u32 version;
137 unsigned short protocol;
138 struct nfs_fh *fh;
139 int noresvport;
140 unsigned int *auth_flav_len;
141 rpc_authflavor_t *auth_flavs;
142 struct net *net;
143 };
144
145 struct nfs_mount_info {
146 void (*fill_super)(struct super_block *, struct nfs_mount_info *);
147 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
148 struct nfs_parsed_mount_data *parsed;
149 struct nfs_clone_mount *cloned;
150 struct nfs_fh *mntfh;
151 };
152
153 extern int nfs_mount(struct nfs_mount_request *info);
154 extern void nfs_umount(const struct nfs_mount_request *info);
155
156 /* client.c */
157 extern const struct rpc_program nfs_program;
158 extern void nfs_clients_init(struct net *net);
159 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
160 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
161 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
162 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
163 void nfs_server_insert_lists(struct nfs_server *);
164 void nfs_server_remove_lists(struct nfs_server *);
165 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
166 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
167 rpc_authflavor_t);
168 struct nfs_server *nfs_alloc_server(void);
169 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
170
171 extern void nfs_cleanup_cb_ident_idr(struct net *);
172 extern void nfs_put_client(struct nfs_client *);
173 extern void nfs_free_client(struct nfs_client *);
174 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
175 extern struct nfs_client *
176 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
177 struct nfs4_sessionid *, u32);
178 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
179 struct nfs_subversion *);
180 extern struct nfs_server *nfs4_create_server(
181 struct nfs_mount_info *,
182 struct nfs_subversion *);
183 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
184 struct nfs_fh *);
185 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
186 struct sockaddr *sap, size_t salen,
187 struct net *net);
188 extern void nfs_free_server(struct nfs_server *server);
189 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
190 struct nfs_fh *,
191 struct nfs_fattr *,
192 rpc_authflavor_t);
193 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
194 extern int nfs_client_init_status(const struct nfs_client *clp);
195 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
196 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
197 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
198 const struct sockaddr *ds_addr,
199 int ds_addrlen, int ds_proto,
200 unsigned int ds_timeo,
201 unsigned int ds_retrans,
202 u32 minor_version);
203 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
204 struct inode *);
205 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
206 const struct sockaddr *ds_addr, int ds_addrlen,
207 int ds_proto, unsigned int ds_timeo,
208 unsigned int ds_retrans);
209 #ifdef CONFIG_PROC_FS
210 extern int __init nfs_fs_proc_init(void);
211 extern void nfs_fs_proc_exit(void);
212 extern int nfs_fs_proc_net_init(struct net *net);
213 extern void nfs_fs_proc_net_exit(struct net *net);
214 #else
215 static inline int nfs_fs_proc_net_init(struct net *net)
216 {
217 return 0;
218 }
219 static inline void nfs_fs_proc_net_exit(struct net *net)
220 {
221 }
222 static inline int nfs_fs_proc_init(void)
223 {
224 return 0;
225 }
226 static inline void nfs_fs_proc_exit(void)
227 {
228 }
229 #endif
230
231 /* callback_xdr.c */
232 extern const struct svc_version nfs4_callback_version1;
233 extern const struct svc_version nfs4_callback_version4;
234
235 struct nfs_pageio_descriptor;
236 /* pagelist.c */
237 extern int __init nfs_init_nfspagecache(void);
238 extern void nfs_destroy_nfspagecache(void);
239 extern int __init nfs_init_readpagecache(void);
240 extern void nfs_destroy_readpagecache(void);
241 extern int __init nfs_init_writepagecache(void);
242 extern void nfs_destroy_writepagecache(void);
243
244 extern int __init nfs_init_directcache(void);
245 extern void nfs_destroy_directcache(void);
246 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
247 struct nfs_pgio_header *hdr,
248 void (*release)(struct nfs_pgio_header *hdr));
249 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
250 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
251
252 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
253 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
254 void nfs_pgio_header_free(struct nfs_pgio_header *);
255 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
256 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
257 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
258 const struct rpc_call_ops *call_ops, int how, int flags);
259 void nfs_free_request(struct nfs_page *req);
260 struct nfs_pgio_mirror *
261 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
262
263 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
264 {
265 WARN_ON_ONCE(desc->pg_mirror_count < 1);
266 return desc->pg_mirror_count > 1;
267 }
268
269 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
270 const struct nfs_open_context *ctx2)
271 {
272 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
273 }
274
275 /* nfs2xdr.c */
276 extern const struct rpc_procinfo nfs_procedures[];
277 extern int nfs2_decode_dirent(struct xdr_stream *,
278 struct nfs_entry *, bool);
279
280 /* nfs3xdr.c */
281 extern const struct rpc_procinfo nfs3_procedures[];
282 extern int nfs3_decode_dirent(struct xdr_stream *,
283 struct nfs_entry *, bool);
284
285 /* nfs4xdr.c */
286 #if IS_ENABLED(CONFIG_NFS_V4)
287 extern int nfs4_decode_dirent(struct xdr_stream *,
288 struct nfs_entry *, bool);
289 #endif
290 #ifdef CONFIG_NFS_V4_1
291 extern const u32 nfs41_maxread_overhead;
292 extern const u32 nfs41_maxwrite_overhead;
293 extern const u32 nfs41_maxgetdevinfo_overhead;
294 #endif
295
296 /* nfs4proc.c */
297 #if IS_ENABLED(CONFIG_NFS_V4)
298 extern const struct rpc_procinfo nfs4_procedures[];
299 #endif
300
301 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
302 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
303 static inline struct nfs4_label *
304 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
305 {
306 if (!dst || !src)
307 return NULL;
308
309 if (src->len > NFS4_MAXLABELLEN)
310 return NULL;
311
312 dst->lfs = src->lfs;
313 dst->pi = src->pi;
314 dst->len = src->len;
315 memcpy(dst->label, src->label, src->len);
316
317 return dst;
318 }
319 static inline void nfs4_label_free(struct nfs4_label *label)
320 {
321 if (label) {
322 kfree(label->label);
323 kfree(label);
324 }
325 return;
326 }
327
328 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
329 {
330 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
331 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
332 }
333 #else
334 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
335 static inline void nfs4_label_free(void *label) {}
336 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
337 {
338 }
339 static inline struct nfs4_label *
340 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
341 {
342 return NULL;
343 }
344 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
345
346 /* proc.c */
347 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
348 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
349 const struct nfs_client_initdata *);
350
351 /* dir.c */
352 extern void nfs_advise_use_readdirplus(struct inode *dir);
353 extern void nfs_force_use_readdirplus(struct inode *dir);
354 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
355 struct shrink_control *sc);
356 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
357 struct shrink_control *sc);
358 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
359 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
360 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
361 int nfs_rmdir(struct inode *, struct dentry *);
362 int nfs_unlink(struct inode *, struct dentry *);
363 int nfs_symlink(struct inode *, struct dentry *, const char *);
364 int nfs_link(struct dentry *, struct inode *, struct dentry *);
365 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
366 int nfs_rename(struct inode *, struct dentry *,
367 struct inode *, struct dentry *, unsigned int);
368
369 /* file.c */
370 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
371 loff_t nfs_file_llseek(struct file *, loff_t, int);
372 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
373 int nfs_file_mmap(struct file *, struct vm_area_struct *);
374 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
375 int nfs_file_release(struct inode *, struct file *);
376 int nfs_lock(struct file *, int, struct file_lock *);
377 int nfs_flock(struct file *, int, struct file_lock *);
378 int nfs_check_flags(int);
379
380 /* inode.c */
381 extern struct workqueue_struct *nfsiod_workqueue;
382 extern struct inode *nfs_alloc_inode(struct super_block *sb);
383 extern void nfs_destroy_inode(struct inode *);
384 extern int nfs_write_inode(struct inode *, struct writeback_control *);
385 extern int nfs_drop_inode(struct inode *);
386 extern void nfs_clear_inode(struct inode *);
387 extern void nfs_evict_inode(struct inode *);
388 void nfs_zap_acl_cache(struct inode *inode);
389 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
390 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
391 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
392
393 /* super.c */
394 extern const struct super_operations nfs_sops;
395 extern struct file_system_type nfs_fs_type;
396 extern struct file_system_type nfs_xdev_fs_type;
397 #if IS_ENABLED(CONFIG_NFS_V4)
398 extern struct file_system_type nfs4_xdev_fs_type;
399 extern struct file_system_type nfs4_referral_fs_type;
400 #endif
401 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
402 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
403 struct nfs_subversion *);
404 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
405 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
406 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
407 struct nfs_mount_info *, struct nfs_subversion *);
408 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
409 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
410 const char *, struct nfs_mount_info *);
411 void nfs_kill_super(struct super_block *);
412 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
413
414 extern struct rpc_stat nfs_rpcstat;
415
416 extern int __init register_nfs_fs(void);
417 extern void __exit unregister_nfs_fs(void);
418 extern bool nfs_sb_active(struct super_block *sb);
419 extern void nfs_sb_deactive(struct super_block *sb);
420
421 /* io.c */
422 extern void nfs_start_io_read(struct inode *inode);
423 extern void nfs_end_io_read(struct inode *inode);
424 extern void nfs_start_io_write(struct inode *inode);
425 extern void nfs_end_io_write(struct inode *inode);
426 extern void nfs_start_io_direct(struct inode *inode);
427 extern void nfs_end_io_direct(struct inode *inode);
428
429 static 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
436 extern char *nfs_path(char **p, struct dentry *dentry,
437 char *buffer, ssize_t buflen, unsigned flags);
438 extern struct vfsmount *nfs_d_automount(struct path *path);
439 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
440 struct nfs_fh *, struct nfs_fattr *);
441 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
442 struct nfs_fattr *, rpc_authflavor_t);
443
444 /* getroot.c */
445 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
446 const char *);
447 #if IS_ENABLED(CONFIG_NFS_V4)
448 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
449 const char *);
450
451 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
452 #endif
453
454 struct nfs_pgio_completion_ops;
455 /* read.c */
456 extern 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);
459 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
460 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
461
462 /* super.c */
463 void nfs_umount_begin(struct super_block *);
464 int nfs_statfs(struct dentry *, struct kstatfs *);
465 int nfs_show_options(struct seq_file *, struct dentry *);
466 int nfs_show_devname(struct seq_file *, struct dentry *);
467 int nfs_show_path(struct seq_file *, struct dentry *);
468 int nfs_show_stats(struct seq_file *, struct dentry *);
469 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
470
471 /* write.c */
472 extern 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);
475 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
476 extern void nfs_commit_free(struct nfs_commit_data *p);
477 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
478 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
479 extern 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);
484 extern 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);
488 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
489 struct nfs_commit_info *cinfo, int max);
490 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
491 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
492 struct nfs_commit_info *cinfo);
493 void 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);
497 int nfs_write_need_commit(struct nfs_pgio_header *);
498 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
499 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
500 int how, struct nfs_commit_info *cinfo);
501 void 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);
505 void nfs_commitdata_release(struct nfs_commit_data *data);
506 void nfs_request_add_commit_list(struct nfs_page *req,
507 struct nfs_commit_info *cinfo);
508 void nfs_request_add_commit_list_locked(struct nfs_page *req,
509 struct list_head *dst,
510 struct nfs_commit_info *cinfo);
511 void nfs_request_remove_commit_list(struct nfs_page *req,
512 struct nfs_commit_info *cinfo);
513 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
514 struct inode *inode,
515 struct nfs_direct_req *dreq);
516 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
517 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
518 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
519
520 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
521 loff_t lstart, loff_t lend);
522
523 #ifdef CONFIG_NFS_V4_1
524 static inline
525 void 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
533 static inline
534 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
535 {
536 }
537 #endif
538
539 #ifdef CONFIG_MIGRATION
540 extern int nfs_migrate_page(struct address_space *,
541 struct page *, struct page *, enum migrate_mode);
542 #endif
543
544 static inline int
545 nfs_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 */
552 extern struct rpc_task *
553 nfs_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 *));
556 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
557
558 /* direct.c */
559 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
560 struct nfs_direct_req *dreq);
561 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
562
563 /* nfs4proc.c */
564 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
565 const struct nfs_client_initdata *);
566 extern int nfs40_walk_client_list(struct nfs_client *clp,
567 struct nfs_client **result,
568 struct rpc_cred *cred);
569 extern int nfs41_walk_client_list(struct nfs_client *clp,
570 struct nfs_client **result,
571 struct rpc_cred *cred);
572 extern int nfs4_test_session_trunk(struct rpc_clnt *,
573 struct rpc_xprt *,
574 void *);
575
576 static 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
586 static 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 */
599 static 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 */
609 static inline
610 unsigned 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 */
629 static 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 */
638 static inline
639 unsigned 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 */
652 static inline
653 void 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 */
663 static inline
664 void 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 */
678 static inline
679 unsigned 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 */
697 static inline
698 unsigned 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 */
707 static inline
708 unsigned 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 */
721 static inline
722 u64 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 */
735 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
736 {
737 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
738 }
739 static 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
745 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
746 {
747 return 0;
748 }
749 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
750 {
751 return 0;
752 }
753 #endif
754
755 static inline bool nfs_error_is_fatal(int err)
756 {
757 switch (err) {
758 case -ERESTARTSYS:
759 case -EACCES:
760 case -EDQUOT:
761 case -EFBIG:
762 case -EIO:
763 case -ENOSPC:
764 case -EROFS:
765 case -ESTALE:
766 case -E2BIG:
767 return true;
768 default:
769 return false;
770 }
771 }
772
773 static inline void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
774 {
775 ctx->error = error;
776 smp_wmb();
777 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
778 }
Linux with added FPC-III support