]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * linux/include/linux/nfs_fs.h | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * OS-specific nfs filesystem definitions and declarations | |
7 | */ | |
8 | #ifndef _LINUX_NFS_FS_H | |
9 | #define _LINUX_NFS_FS_H | |
10 | ||
11 | #include <uapi/linux/nfs_fs.h> | |
12 | ||
13 | ||
14 | /* | |
15 | * Enable dprintk() debugging support for nfs client. | |
16 | */ | |
17 | #ifdef CONFIG_NFS_DEBUG | |
18 | # define NFS_DEBUG | |
19 | #endif | |
20 | ||
21 | #include <linux/in.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/rbtree.h> | |
25 | #include <linux/rwsem.h> | |
26 | #include <linux/wait.h> | |
27 | ||
28 | #include <linux/sunrpc/debug.h> | |
29 | #include <linux/sunrpc/auth.h> | |
30 | #include <linux/sunrpc/clnt.h> | |
31 | ||
32 | #include <linux/nfs.h> | |
33 | #include <linux/nfs2.h> | |
34 | #include <linux/nfs3.h> | |
35 | #include <linux/nfs4.h> | |
36 | #include <linux/nfs_xdr.h> | |
37 | #include <linux/nfs_fs_sb.h> | |
38 | ||
39 | #include <linux/mempool.h> | |
40 | ||
41 | /* | |
42 | * These are the default flags for swap requests | |
43 | */ | |
44 | #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) | |
45 | ||
46 | /* | |
47 | * NFSv3/v4 Access mode cache entry | |
48 | */ | |
49 | struct nfs_access_entry { | |
50 | struct rb_node rb_node; | |
51 | struct list_head lru; | |
52 | unsigned long jiffies; | |
53 | struct rpc_cred * cred; | |
54 | int mask; | |
55 | struct rcu_head rcu_head; | |
56 | }; | |
57 | ||
58 | struct nfs_lockowner { | |
59 | fl_owner_t l_owner; | |
60 | pid_t l_pid; | |
61 | }; | |
62 | ||
63 | #define NFS_IO_INPROGRESS 0 | |
64 | struct nfs_io_counter { | |
65 | unsigned long flags; | |
66 | atomic_t io_count; | |
67 | }; | |
68 | ||
69 | struct nfs_lock_context { | |
70 | atomic_t count; | |
71 | struct list_head list; | |
72 | struct nfs_open_context *open_context; | |
73 | struct nfs_lockowner lockowner; | |
74 | struct nfs_io_counter io_count; | |
75 | }; | |
76 | ||
77 | struct nfs4_state; | |
78 | struct nfs_open_context { | |
79 | struct nfs_lock_context lock_context; | |
80 | struct dentry *dentry; | |
81 | struct rpc_cred *cred; | |
82 | struct nfs4_state *state; | |
83 | fmode_t mode; | |
84 | ||
85 | unsigned long flags; | |
86 | #define NFS_CONTEXT_ERROR_WRITE (0) | |
87 | #define NFS_CONTEXT_RESEND_WRITES (1) | |
88 | #define NFS_CONTEXT_BAD (2) | |
89 | int error; | |
90 | ||
91 | struct list_head list; | |
92 | struct nfs4_threshold *mdsthreshold; | |
93 | }; | |
94 | ||
95 | struct nfs_open_dir_context { | |
96 | struct list_head list; | |
97 | struct rpc_cred *cred; | |
98 | unsigned long attr_gencount; | |
99 | __u64 dir_cookie; | |
100 | __u64 dup_cookie; | |
101 | signed char duped; | |
102 | }; | |
103 | ||
104 | /* | |
105 | * NFSv4 delegation | |
106 | */ | |
107 | struct nfs_delegation; | |
108 | ||
109 | struct posix_acl; | |
110 | ||
111 | /* | |
112 | * nfs fs inode data in memory | |
113 | */ | |
114 | struct nfs_inode { | |
115 | /* | |
116 | * The 64bit 'inode number' | |
117 | */ | |
118 | __u64 fileid; | |
119 | ||
120 | /* | |
121 | * NFS file handle | |
122 | */ | |
123 | struct nfs_fh fh; | |
124 | ||
125 | /* | |
126 | * Various flags | |
127 | */ | |
128 | unsigned long flags; /* atomic bit ops */ | |
129 | unsigned long cache_validity; /* bit mask */ | |
130 | ||
131 | /* | |
132 | * read_cache_jiffies is when we started read-caching this inode. | |
133 | * attrtimeo is for how long the cached information is assumed | |
134 | * to be valid. A successful attribute revalidation doubles | |
135 | * attrtimeo (up to acregmax/acdirmax), a failure resets it to | |
136 | * acregmin/acdirmin. | |
137 | * | |
138 | * We need to revalidate the cached attrs for this inode if | |
139 | * | |
140 | * jiffies - read_cache_jiffies >= attrtimeo | |
141 | * | |
142 | * Please note the comparison is greater than or equal | |
143 | * so that zero timeout values can be specified. | |
144 | */ | |
145 | unsigned long read_cache_jiffies; | |
146 | unsigned long attrtimeo; | |
147 | unsigned long attrtimeo_timestamp; | |
148 | ||
149 | unsigned long attr_gencount; | |
150 | /* "Generation counter" for the attribute cache. This is | |
151 | * bumped whenever we update the metadata on the | |
152 | * server. | |
153 | */ | |
154 | unsigned long cache_change_attribute; | |
155 | ||
156 | struct rb_root access_cache; | |
157 | struct list_head access_cache_entry_lru; | |
158 | struct list_head access_cache_inode_lru; | |
159 | ||
160 | /* | |
161 | * This is the cookie verifier used for NFSv3 readdir | |
162 | * operations | |
163 | */ | |
164 | __be32 cookieverf[2]; | |
165 | ||
166 | unsigned long nrequests; | |
167 | struct nfs_mds_commit_info commit_info; | |
168 | ||
169 | /* Open contexts for shared mmap writes */ | |
170 | struct list_head open_files; | |
171 | ||
172 | /* Number of in-flight sillydelete RPC calls */ | |
173 | atomic_t silly_count; | |
174 | /* List of deferred sillydelete requests */ | |
175 | struct hlist_head silly_list; | |
176 | wait_queue_head_t waitqueue; | |
177 | ||
178 | #if IS_ENABLED(CONFIG_NFS_V4) | |
179 | struct nfs4_cached_acl *nfs4_acl; | |
180 | /* NFSv4 state */ | |
181 | struct list_head open_states; | |
182 | struct nfs_delegation __rcu *delegation; | |
183 | struct rw_semaphore rwsem; | |
184 | ||
185 | /* pNFS layout information */ | |
186 | struct pnfs_layout_hdr *layout; | |
187 | #endif /* CONFIG_NFS_V4*/ | |
188 | /* how many bytes have been written/read and how many bytes queued up */ | |
189 | __u64 write_io; | |
190 | __u64 read_io; | |
191 | #ifdef CONFIG_NFS_FSCACHE | |
192 | struct fscache_cookie *fscache; | |
193 | #endif | |
194 | struct inode vfs_inode; | |
195 | }; | |
196 | ||
197 | /* | |
198 | * Cache validity bit flags | |
199 | */ | |
200 | #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */ | |
201 | #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */ | |
202 | #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */ | |
203 | #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */ | |
204 | #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */ | |
205 | #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */ | |
206 | #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */ | |
207 | #define NFS_INO_INVALID_LABEL 0x0080 /* cached label is invalid */ | |
208 | ||
209 | /* | |
210 | * Bit offsets in flags field | |
211 | */ | |
212 | #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */ | |
213 | #define NFS_INO_STALE (1) /* possible stale inode */ | |
214 | #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */ | |
215 | #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */ | |
216 | #define NFS_INO_FLUSHING (4) /* inode is flushing out data */ | |
217 | #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */ | |
218 | #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */ | |
219 | #define NFS_INO_COMMIT (7) /* inode is committing unstable writes */ | |
220 | #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */ | |
221 | #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */ | |
222 | #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */ | |
223 | ||
224 | static inline struct nfs_inode *NFS_I(const struct inode *inode) | |
225 | { | |
226 | return container_of(inode, struct nfs_inode, vfs_inode); | |
227 | } | |
228 | ||
229 | static inline struct nfs_server *NFS_SB(const struct super_block *s) | |
230 | { | |
231 | return (struct nfs_server *)(s->s_fs_info); | |
232 | } | |
233 | ||
234 | static inline struct nfs_fh *NFS_FH(const struct inode *inode) | |
235 | { | |
236 | return &NFS_I(inode)->fh; | |
237 | } | |
238 | ||
239 | static inline struct nfs_server *NFS_SERVER(const struct inode *inode) | |
240 | { | |
241 | return NFS_SB(inode->i_sb); | |
242 | } | |
243 | ||
244 | static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode) | |
245 | { | |
246 | return NFS_SERVER(inode)->client; | |
247 | } | |
248 | ||
249 | static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode) | |
250 | { | |
251 | return NFS_SERVER(inode)->nfs_client->rpc_ops; | |
252 | } | |
253 | ||
254 | static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode) | |
255 | { | |
256 | struct nfs_server *nfss = NFS_SERVER(inode); | |
257 | return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin; | |
258 | } | |
259 | ||
260 | static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode) | |
261 | { | |
262 | struct nfs_server *nfss = NFS_SERVER(inode); | |
263 | return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax; | |
264 | } | |
265 | ||
266 | static inline int NFS_STALE(const struct inode *inode) | |
267 | { | |
268 | return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags); | |
269 | } | |
270 | ||
271 | static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode) | |
272 | { | |
273 | #ifdef CONFIG_NFS_FSCACHE | |
274 | return NFS_I(inode)->fscache; | |
275 | #else | |
276 | return NULL; | |
277 | #endif | |
278 | } | |
279 | ||
280 | static inline __u64 NFS_FILEID(const struct inode *inode) | |
281 | { | |
282 | return NFS_I(inode)->fileid; | |
283 | } | |
284 | ||
285 | static inline void set_nfs_fileid(struct inode *inode, __u64 fileid) | |
286 | { | |
287 | NFS_I(inode)->fileid = fileid; | |
288 | } | |
289 | ||
290 | static inline void nfs_mark_for_revalidate(struct inode *inode) | |
291 | { | |
292 | struct nfs_inode *nfsi = NFS_I(inode); | |
293 | ||
294 | spin_lock(&inode->i_lock); | |
295 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR | | |
296 | NFS_INO_REVAL_PAGECACHE | | |
297 | NFS_INO_INVALID_ACCESS | | |
298 | NFS_INO_INVALID_ACL; | |
299 | if (S_ISDIR(inode->i_mode)) | |
300 | nfsi->cache_validity |= NFS_INO_INVALID_DATA; | |
301 | spin_unlock(&inode->i_lock); | |
302 | } | |
303 | ||
304 | static inline int nfs_server_capable(struct inode *inode, int cap) | |
305 | { | |
306 | return NFS_SERVER(inode)->caps & cap; | |
307 | } | |
308 | ||
309 | static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf) | |
310 | { | |
311 | dentry->d_time = verf; | |
312 | } | |
313 | ||
314 | /** | |
315 | * nfs_save_change_attribute - Returns the inode attribute change cookie | |
316 | * @dir - pointer to parent directory inode | |
317 | * The "change attribute" is updated every time we finish an operation | |
318 | * that will result in a metadata change on the server. | |
319 | */ | |
320 | static inline unsigned long nfs_save_change_attribute(struct inode *dir) | |
321 | { | |
322 | return NFS_I(dir)->cache_change_attribute; | |
323 | } | |
324 | ||
325 | /** | |
326 | * nfs_verify_change_attribute - Detects NFS remote directory changes | |
327 | * @dir - pointer to parent directory inode | |
328 | * @chattr - previously saved change attribute | |
329 | * Return "false" if the verifiers doesn't match the change attribute. | |
330 | * This would usually indicate that the directory contents have changed on | |
331 | * the server, and that any dentries need revalidating. | |
332 | */ | |
333 | static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr) | |
334 | { | |
335 | return chattr == NFS_I(dir)->cache_change_attribute; | |
336 | } | |
337 | ||
338 | /* | |
339 | * linux/fs/nfs/inode.c | |
340 | */ | |
341 | extern int nfs_sync_mapping(struct address_space *mapping); | |
342 | extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping); | |
343 | extern void nfs_zap_caches(struct inode *); | |
344 | extern void nfs_invalidate_atime(struct inode *); | |
345 | extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *, | |
346 | struct nfs_fattr *, struct nfs4_label *); | |
347 | extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *); | |
348 | extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr); | |
349 | extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr); | |
350 | extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr); | |
351 | extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *); | |
352 | extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *); | |
353 | extern void nfs_access_set_mask(struct nfs_access_entry *, u32); | |
354 | extern int nfs_permission(struct inode *, int); | |
355 | extern int nfs_open(struct inode *, struct file *); | |
356 | extern int nfs_attribute_timeout(struct inode *inode); | |
357 | extern int nfs_attribute_cache_expired(struct inode *inode); | |
358 | extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode); | |
359 | extern int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode); | |
360 | extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *); | |
361 | extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping); | |
362 | extern int nfs_revalidate_mapping_protected(struct inode *inode, struct address_space *mapping); | |
363 | extern int nfs_setattr(struct dentry *, struct iattr *); | |
364 | extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *); | |
365 | extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr, | |
366 | struct nfs4_label *label); | |
367 | extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx); | |
368 | extern void put_nfs_open_context(struct nfs_open_context *ctx); | |
369 | extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode); | |
370 | extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode); | |
371 | extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx); | |
372 | extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx); | |
373 | extern void nfs_file_clear_open_context(struct file *flip); | |
374 | extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx); | |
375 | extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx); | |
376 | extern u64 nfs_compat_user_ino64(u64 fileid); | |
377 | extern void nfs_fattr_init(struct nfs_fattr *fattr); | |
378 | extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr); | |
379 | extern unsigned long nfs_inc_attr_generation_counter(void); | |
380 | ||
381 | extern struct nfs_fattr *nfs_alloc_fattr(void); | |
382 | ||
383 | static inline void nfs_free_fattr(const struct nfs_fattr *fattr) | |
384 | { | |
385 | kfree(fattr); | |
386 | } | |
387 | ||
388 | extern struct nfs_fh *nfs_alloc_fhandle(void); | |
389 | ||
390 | static inline void nfs_free_fhandle(const struct nfs_fh *fh) | |
391 | { | |
392 | kfree(fh); | |
393 | } | |
394 | ||
395 | #ifdef NFS_DEBUG | |
396 | extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh); | |
397 | static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) | |
398 | { | |
399 | return _nfs_display_fhandle_hash(fh); | |
400 | } | |
401 | extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption); | |
402 | #define nfs_display_fhandle(fh, caption) \ | |
403 | do { \ | |
404 | if (unlikely(nfs_debug & NFSDBG_FACILITY)) \ | |
405 | _nfs_display_fhandle(fh, caption); \ | |
406 | } while (0) | |
407 | #else | |
408 | static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh) | |
409 | { | |
410 | return 0; | |
411 | } | |
412 | static inline void nfs_display_fhandle(const struct nfs_fh *fh, | |
413 | const char *caption) | |
414 | { | |
415 | } | |
416 | #endif | |
417 | ||
418 | /* | |
419 | * linux/fs/nfs/nfsroot.c | |
420 | */ | |
421 | extern int nfs_root_data(char **root_device, char **root_data); /*__init*/ | |
422 | /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */ | |
423 | extern __be32 root_nfs_parse_addr(char *name); /*__init*/ | |
424 | ||
425 | /* | |
426 | * linux/fs/nfs/file.c | |
427 | */ | |
428 | extern const struct file_operations nfs_file_operations; | |
429 | #if IS_ENABLED(CONFIG_NFS_V4) | |
430 | extern const struct file_operations nfs4_file_operations; | |
431 | #endif /* CONFIG_NFS_V4 */ | |
432 | extern const struct address_space_operations nfs_file_aops; | |
433 | extern const struct address_space_operations nfs_dir_aops; | |
434 | ||
435 | static inline struct nfs_open_context *nfs_file_open_context(struct file *filp) | |
436 | { | |
437 | return filp->private_data; | |
438 | } | |
439 | ||
440 | static inline struct rpc_cred *nfs_file_cred(struct file *file) | |
441 | { | |
442 | if (file != NULL) { | |
443 | struct nfs_open_context *ctx = | |
444 | nfs_file_open_context(file); | |
445 | if (ctx) | |
446 | return ctx->cred; | |
447 | } | |
448 | return NULL; | |
449 | } | |
450 | ||
451 | /* | |
452 | * linux/fs/nfs/direct.c | |
453 | */ | |
454 | extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *, loff_t); | |
455 | extern ssize_t nfs_file_direct_read(struct kiocb *iocb, | |
456 | struct iov_iter *iter, | |
457 | loff_t pos); | |
458 | extern ssize_t nfs_file_direct_write(struct kiocb *iocb, | |
459 | struct iov_iter *iter); | |
460 | ||
461 | /* | |
462 | * linux/fs/nfs/dir.c | |
463 | */ | |
464 | extern const struct file_operations nfs_dir_operations; | |
465 | extern const struct dentry_operations nfs_dentry_operations; | |
466 | ||
467 | extern void nfs_force_lookup_revalidate(struct inode *dir); | |
468 | extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, | |
469 | struct nfs_fattr *fattr, struct nfs4_label *label); | |
470 | extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags); | |
471 | extern void nfs_access_zap_cache(struct inode *inode); | |
472 | ||
473 | /* | |
474 | * linux/fs/nfs/symlink.c | |
475 | */ | |
476 | extern const struct inode_operations nfs_symlink_inode_operations; | |
477 | ||
478 | /* | |
479 | * linux/fs/nfs/sysctl.c | |
480 | */ | |
481 | #ifdef CONFIG_SYSCTL | |
482 | extern int nfs_register_sysctl(void); | |
483 | extern void nfs_unregister_sysctl(void); | |
484 | #else | |
485 | #define nfs_register_sysctl() 0 | |
486 | #define nfs_unregister_sysctl() do { } while(0) | |
487 | #endif | |
488 | ||
489 | /* | |
490 | * linux/fs/nfs/namespace.c | |
491 | */ | |
492 | extern const struct inode_operations nfs_mountpoint_inode_operations; | |
493 | extern const struct inode_operations nfs_referral_inode_operations; | |
494 | extern int nfs_mountpoint_expiry_timeout; | |
495 | extern void nfs_release_automount_timer(void); | |
496 | ||
497 | /* | |
498 | * linux/fs/nfs/unlink.c | |
499 | */ | |
500 | extern void nfs_complete_unlink(struct dentry *dentry, struct inode *); | |
501 | extern void nfs_wait_on_sillyrename(struct dentry *dentry); | |
502 | extern void nfs_block_sillyrename(struct dentry *dentry); | |
503 | extern void nfs_unblock_sillyrename(struct dentry *dentry); | |
504 | ||
505 | /* | |
506 | * linux/fs/nfs/write.c | |
507 | */ | |
508 | extern int nfs_congestion_kb; | |
509 | extern int nfs_writepage(struct page *page, struct writeback_control *wbc); | |
510 | extern int nfs_writepages(struct address_space *, struct writeback_control *); | |
511 | extern int nfs_flush_incompatible(struct file *file, struct page *page); | |
512 | extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int); | |
513 | ||
514 | /* | |
515 | * Try to write back everything synchronously (but check the | |
516 | * return value!) | |
517 | */ | |
518 | extern int nfs_sync_inode(struct inode *inode); | |
519 | extern int nfs_wb_all(struct inode *inode); | |
520 | extern int nfs_wb_page(struct inode *inode, struct page* page); | |
521 | extern int nfs_wb_page_cancel(struct inode *inode, struct page* page); | |
522 | extern int nfs_commit_inode(struct inode *, int); | |
523 | extern struct nfs_commit_data *nfs_commitdata_alloc(void); | |
524 | extern void nfs_commit_free(struct nfs_commit_data *data); | |
525 | ||
526 | static inline int | |
527 | nfs_have_writebacks(struct inode *inode) | |
528 | { | |
529 | return NFS_I(inode)->nrequests != 0; | |
530 | } | |
531 | ||
532 | /* | |
533 | * linux/fs/nfs/read.c | |
534 | */ | |
535 | extern int nfs_readpage(struct file *, struct page *); | |
536 | extern int nfs_readpages(struct file *, struct address_space *, | |
537 | struct list_head *, unsigned); | |
538 | extern int nfs_readpage_async(struct nfs_open_context *, struct inode *, | |
539 | struct page *); | |
540 | ||
541 | /* | |
542 | * inline functions | |
543 | */ | |
544 | ||
545 | static inline loff_t nfs_size_to_loff_t(__u64 size) | |
546 | { | |
547 | if (size > (__u64) OFFSET_MAX - 1) | |
548 | return OFFSET_MAX - 1; | |
549 | return (loff_t) size; | |
550 | } | |
551 | ||
552 | static inline ino_t | |
553 | nfs_fileid_to_ino_t(u64 fileid) | |
554 | { | |
555 | ino_t ino = (ino_t) fileid; | |
556 | if (sizeof(ino_t) < sizeof(u64)) | |
557 | ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8; | |
558 | return ino; | |
559 | } | |
560 | ||
561 | #define NFS_JUKEBOX_RETRY_TIME (5 * HZ) | |
562 | ||
563 | ||
564 | # undef ifdebug | |
565 | # ifdef NFS_DEBUG | |
566 | # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac)) | |
567 | # define NFS_IFDEBUG(x) x | |
568 | # else | |
569 | # define ifdebug(fac) if (0) | |
570 | # define NFS_IFDEBUG(x) | |
571 | # endif | |
572 | #endif |