1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * linux/include/linux/nfs_fs.h
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * OS-specific nfs filesystem definitions and declarations
8 */
9 #ifndef _LINUX_NFS_FS_H
10 #define _LINUX_NFS_FS_H
11
12 #include <uapi/linux/nfs_fs.h>
13
14
15 /*
16 * Enable dprintk() debugging support for nfs client.
17 */
18 #ifdef CONFIG_NFS_DEBUG
19 # define NFS_DEBUG
20 #endif
21
22 #include <linux/in.h>
23 #include <linux/mm.h>
24 #include <linux/pagemap.h>
25 #include <linux/rbtree.h>
26 #include <linux/refcount.h>
27 #include <linux/rwsem.h>
28 #include <linux/wait.h>
29
30 #include <linux/sunrpc/debug.h>
31 #include <linux/sunrpc/auth.h>
32 #include <linux/sunrpc/clnt.h>
33
34 #include <linux/nfs.h>
35 #include <linux/nfs2.h>
36 #include <linux/nfs3.h>
37 #include <linux/nfs4.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/nfs_fs_sb.h>
40
41 #include <linux/mempool.h>
42
43 /*
44 * These are the default for number of transports to different server IPs
45 */
46 #define NFS_MAX_TRANSPORTS 16
47
48 /*
49 * These are the default flags for swap requests
50 */
51 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
52
53 /*
54 * Size of the NFS directory verifier
55 */
56 #define NFS_DIR_VERIFIER_SIZE 2
57
58 /*
59 * NFSv3/v4 Access mode cache entry
60 */
61 struct nfs_access_entry {
62 struct rb_node rb_node;
63 struct list_head lru;
64 const struct cred * cred;
65 __u32 mask;
66 struct rcu_head rcu_head;
67 };
68
69 struct nfs_lock_context {
70 refcount_t count;
71 struct list_head list;
72 struct nfs_open_context *open_context;
73 fl_owner_t lockowner;
74 atomic_t io_count;
75 struct rcu_head rcu_head;
76 };
77
78 struct nfs4_state;
79 struct nfs_open_context {
80 struct nfs_lock_context lock_context;
81 fl_owner_t flock_owner;
82 struct dentry *dentry;
83 const struct cred *cred;
84 struct rpc_cred *ll_cred; /* low-level cred - use to check for expiry */
85 struct nfs4_state *state;
86 fmode_t mode;
87
88 unsigned long flags;
89 #define NFS_CONTEXT_RESEND_WRITES (1)
90 #define NFS_CONTEXT_BAD (2)
91 #define NFS_CONTEXT_UNLOCK (3)
92 #define NFS_CONTEXT_FILE_OPEN (4)
93 int error;
94
95 struct list_head list;
96 struct nfs4_threshold *mdsthreshold;
97 struct rcu_head rcu_head;
98 };
99
100 struct nfs_open_dir_context {
101 struct list_head list;
102 unsigned long attr_gencount;
103 __be32 verf[NFS_DIR_VERIFIER_SIZE];
104 __u64 dir_cookie;
105 __u64 dup_cookie;
106 signed char duped;
107 };
108
109 /*
110 * NFSv4 delegation
111 */
112 struct nfs_delegation;
113
114 struct posix_acl;
115
116 struct nfs4_xattr_cache;
117
118 /*
119 * nfs fs inode data in memory
120 */
121 struct nfs_inode {
122 /*
123 * The 64bit 'inode number'
124 */
125 __u64 fileid;
126
127 /*
128 * NFS file handle
129 */
130 struct nfs_fh fh;
131
132 /*
133 * Various flags
134 */
135 unsigned long flags; /* atomic bit ops */
136 unsigned long cache_validity; /* bit mask */
137
138 /*
139 * read_cache_jiffies is when we started read-caching this inode.
140 * attrtimeo is for how long the cached information is assumed
141 * to be valid. A successful attribute revalidation doubles
142 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
143 * acregmin/acdirmin.
144 *
145 * We need to revalidate the cached attrs for this inode if
146 *
147 * jiffies - read_cache_jiffies >= attrtimeo
148 *
149 * Please note the comparison is greater than or equal
150 * so that zero timeout values can be specified.
151 */
152 unsigned long read_cache_jiffies;
153 unsigned long attrtimeo;
154 unsigned long attrtimeo_timestamp;
155
156 unsigned long attr_gencount;
157 /* "Generation counter" for the attribute cache. This is
158 * bumped whenever we update the metadata on the
159 * server.
160 */
161 unsigned long cache_change_attribute;
162
163 struct rb_root access_cache;
164 struct list_head access_cache_entry_lru;
165 struct list_head access_cache_inode_lru;
166
167 /*
168 * This is the cookie verifier used for NFSv3 readdir
169 * operations
170 */
171 __be32 cookieverf[NFS_DIR_VERIFIER_SIZE];
172
173 atomic_long_t nrequests;
174 struct nfs_mds_commit_info commit_info;
175
176 /* Open contexts for shared mmap writes */
177 struct list_head open_files;
178
179 /* Readers: in-flight sillydelete RPC calls */
180 /* Writers: rmdir */
181 struct rw_semaphore rmdir_sem;
182 struct mutex commit_mutex;
183
184 /* track last access to cached pages */
185 unsigned long page_index;
186
187 #if IS_ENABLED(CONFIG_NFS_V4)
188 struct nfs4_cached_acl *nfs4_acl;
189 /* NFSv4 state */
190 struct list_head open_states;
191 struct nfs_delegation __rcu *delegation;
192 struct rw_semaphore rwsem;
193
194 /* pNFS layout information */
195 struct pnfs_layout_hdr *layout;
196 #endif /* CONFIG_NFS_V4*/
197 /* how many bytes have been written/read and how many bytes queued up */
198 __u64 write_io;
199 __u64 read_io;
200 #ifdef CONFIG_NFS_FSCACHE
201 struct fscache_cookie *fscache;
202 #endif
203 struct inode vfs_inode;
204
205 #ifdef CONFIG_NFS_V4_2
206 struct nfs4_xattr_cache *xattr_cache;
207 #endif
208 };
209
210 struct nfs4_copy_state {
211 struct list_head copies;
212 struct list_head src_copies;
213 nfs4_stateid stateid;
214 struct completion completion;
215 uint64_t count;
216 struct nfs_writeverf verf;
217 int error;
218 int flags;
219 struct nfs4_state *parent_src_state;
220 struct nfs4_state *parent_dst_state;
221 };
222
223 /*
224 * Access bit flags
225 */
226 #define NFS_ACCESS_READ 0x0001
227 #define NFS_ACCESS_LOOKUP 0x0002
228 #define NFS_ACCESS_MODIFY 0x0004
229 #define NFS_ACCESS_EXTEND 0x0008
230 #define NFS_ACCESS_DELETE 0x0010
231 #define NFS_ACCESS_EXECUTE 0x0020
232 #define NFS_ACCESS_XAREAD 0x0040
233 #define NFS_ACCESS_XAWRITE 0x0080
234 #define NFS_ACCESS_XALIST 0x0100
235
236 /*
237 * Cache validity bit flags
238 */
239 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */
240 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */
241 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */
242 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */
243 #define NFS_INO_REVAL_PAGECACHE BIT(5) /* must revalidate pagecache */
244 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */
245 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */
246 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */
247 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */
248 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */
249 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */
250 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */
251 #define NFS_INO_DATA_INVAL_DEFER \
252 BIT(13) /* Deferred cache invalidation */
253 #define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */
254 #define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */
255 #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */
256 #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */
257
258 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \
259 | NFS_INO_INVALID_CTIME \
260 | NFS_INO_INVALID_MTIME \
261 | NFS_INO_INVALID_SIZE \
262 | NFS_INO_INVALID_NLINK \
263 | NFS_INO_INVALID_MODE \
264 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */
265
266 /*
267 * Bit offsets in flags field
268 */
269 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
270 #define NFS_INO_STALE (1) /* possible stale inode */
271 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
272 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
273 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
274 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
275 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
276 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
277 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
278 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */
279
NFS_I(const struct inode * inode)280 static inline struct nfs_inode *NFS_I(const struct inode *inode)
281 {
282 return container_of(inode, struct nfs_inode, vfs_inode);
283 }
284
NFS_SB(const struct super_block * s)285 static inline struct nfs_server *NFS_SB(const struct super_block *s)
286 {
287 return (struct nfs_server *)(s->s_fs_info);
288 }
289
NFS_FH(const struct inode * inode)290 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
291 {
292 return &NFS_I(inode)->fh;
293 }
294
NFS_SERVER(const struct inode * inode)295 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
296 {
297 return NFS_SB(inode->i_sb);
298 }
299
NFS_CLIENT(const struct inode * inode)300 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
301 {
302 return NFS_SERVER(inode)->client;
303 }
304
NFS_PROTO(const struct inode * inode)305 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
306 {
307 return NFS_SERVER(inode)->nfs_client->rpc_ops;
308 }
309
NFS_MINATTRTIMEO(const struct inode * inode)310 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
311 {
312 struct nfs_server *nfss = NFS_SERVER(inode);
313 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
314 }
315
NFS_MAXATTRTIMEO(const struct inode * inode)316 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
317 {
318 struct nfs_server *nfss = NFS_SERVER(inode);
319 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
320 }
321
NFS_STALE(const struct inode * inode)322 static inline int NFS_STALE(const struct inode *inode)
323 {
324 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
325 }
326
nfs_i_fscache(struct inode * inode)327 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
328 {
329 #ifdef CONFIG_NFS_FSCACHE
330 return NFS_I(inode)->fscache;
331 #else
332 return NULL;
333 #endif
334 }
335
NFS_FILEID(const struct inode * inode)336 static inline __u64 NFS_FILEID(const struct inode *inode)
337 {
338 return NFS_I(inode)->fileid;
339 }
340
set_nfs_fileid(struct inode * inode,__u64 fileid)341 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
342 {
343 NFS_I(inode)->fileid = fileid;
344 }
345
nfs_mark_for_revalidate(struct inode * inode)346 static inline void nfs_mark_for_revalidate(struct inode *inode)
347 {
348 struct nfs_inode *nfsi = NFS_I(inode);
349
350 spin_lock(&inode->i_lock);
351 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE
352 | NFS_INO_INVALID_ACCESS
353 | NFS_INO_INVALID_ACL
354 | NFS_INO_INVALID_CHANGE
355 | NFS_INO_INVALID_CTIME;
356 if (S_ISDIR(inode->i_mode))
357 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
358 spin_unlock(&inode->i_lock);
359 }
360
nfs_server_capable(struct inode * inode,int cap)361 static inline int nfs_server_capable(struct inode *inode, int cap)
362 {
363 return NFS_SERVER(inode)->caps & cap;
364 }
365
366 /**
367 * nfs_save_change_attribute - Returns the inode attribute change cookie
368 * @dir - pointer to parent directory inode
369 * The "cache change attribute" is updated when we need to revalidate
370 * our dentry cache after a directory was seen to change on the server.
371 */
nfs_save_change_attribute(struct inode * dir)372 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
373 {
374 return NFS_I(dir)->cache_change_attribute;
375 }
376
377 /*
378 * linux/fs/nfs/inode.c
379 */
380 extern int nfs_sync_mapping(struct address_space *mapping);
381 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
382 extern void nfs_zap_caches(struct inode *);
383 extern void nfs_set_inode_stale(struct inode *inode);
384 extern void nfs_invalidate_atime(struct inode *);
385 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
386 struct nfs_fattr *, struct nfs4_label *);
387 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
388 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
389 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
390 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
391 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
392 extern int nfs_getattr(struct user_namespace *, const struct path *,
393 struct kstat *, u32, unsigned int);
394 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
395 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
396 extern int nfs_permission(struct user_namespace *, struct inode *, int);
397 extern int nfs_open(struct inode *, struct file *);
398 extern int nfs_attribute_cache_expired(struct inode *inode);
399 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);
400 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
401 extern int nfs_clear_invalid_mapping(struct address_space *mapping);
402 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
403 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
404 extern int nfs_revalidate_mapping_rcu(struct inode *inode);
405 extern int nfs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
406 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
407 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
408 struct nfs4_label *label);
409 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
410 extern void put_nfs_open_context(struct nfs_open_context *ctx);
411 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
412 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
413 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
414 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
415 extern void nfs_file_clear_open_context(struct file *flip);
416 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
417 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
418 extern u64 nfs_compat_user_ino64(u64 fileid);
419 extern void nfs_fattr_init(struct nfs_fattr *fattr);
420 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
421 extern unsigned long nfs_inc_attr_generation_counter(void);
422
423 extern struct nfs_fattr *nfs_alloc_fattr(void);
424
nfs_free_fattr(const struct nfs_fattr * fattr)425 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
426 {
427 kfree(fattr);
428 }
429
430 extern struct nfs_fh *nfs_alloc_fhandle(void);
431
nfs_free_fhandle(const struct nfs_fh * fh)432 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
433 {
434 kfree(fh);
435 }
436
437 #ifdef NFS_DEBUG
438 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
nfs_display_fhandle_hash(const struct nfs_fh * fh)439 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
440 {
441 return _nfs_display_fhandle_hash(fh);
442 }
443 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
444 #define nfs_display_fhandle(fh, caption) \
445 do { \
446 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
447 _nfs_display_fhandle(fh, caption); \
448 } while (0)
449 #else
nfs_display_fhandle_hash(const struct nfs_fh * fh)450 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
451 {
452 return 0;
453 }
nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)454 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
455 const char *caption)
456 {
457 }
458 #endif
459
460 /*
461 * linux/fs/nfs/nfsroot.c
462 */
463 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
464 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
465 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
466
467 /*
468 * linux/fs/nfs/file.c
469 */
470 extern const struct file_operations nfs_file_operations;
471 #if IS_ENABLED(CONFIG_NFS_V4)
472 extern const struct file_operations nfs4_file_operations;
473 #endif /* CONFIG_NFS_V4 */
474 extern const struct address_space_operations nfs_file_aops;
475 extern const struct address_space_operations nfs_dir_aops;
476
nfs_file_open_context(struct file * filp)477 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
478 {
479 return filp->private_data;
480 }
481
nfs_file_cred(struct file * file)482 static inline const struct cred *nfs_file_cred(struct file *file)
483 {
484 if (file != NULL) {
485 struct nfs_open_context *ctx =
486 nfs_file_open_context(file);
487 if (ctx)
488 return ctx->cred;
489 }
490 return NULL;
491 }
492
493 /*
494 * linux/fs/nfs/direct.c
495 */
496 extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *);
497 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
498 struct iov_iter *iter);
499 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
500 struct iov_iter *iter);
501
502 /*
503 * linux/fs/nfs/dir.c
504 */
505 extern const struct file_operations nfs_dir_operations;
506 extern const struct dentry_operations nfs_dentry_operations;
507
508 extern void nfs_force_lookup_revalidate(struct inode *dir);
509 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);
510 #if IS_ENABLED(CONFIG_NFS_V4)
511 extern void nfs_clear_verifier_delegated(struct inode *inode);
512 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
513 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
514 struct nfs_fh *fh, struct nfs_fattr *fattr,
515 struct nfs4_label *label);
516 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
517 struct nfs_fattr *fattr, struct nfs4_label *label);
518 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
519 extern void nfs_access_zap_cache(struct inode *inode);
520 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res,
521 bool may_block);
522
523 /*
524 * linux/fs/nfs/symlink.c
525 */
526 extern const struct inode_operations nfs_symlink_inode_operations;
527
528 /*
529 * linux/fs/nfs/sysctl.c
530 */
531 #ifdef CONFIG_SYSCTL
532 extern int nfs_register_sysctl(void);
533 extern void nfs_unregister_sysctl(void);
534 #else
535 #define nfs_register_sysctl() 0
536 #define nfs_unregister_sysctl() do { } while(0)
537 #endif
538
539 /*
540 * linux/fs/nfs/namespace.c
541 */
542 extern const struct inode_operations nfs_mountpoint_inode_operations;
543 extern const struct inode_operations nfs_referral_inode_operations;
544 extern int nfs_mountpoint_expiry_timeout;
545 extern void nfs_release_automount_timer(void);
546
547 /*
548 * linux/fs/nfs/unlink.c
549 */
550 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
551
552 /*
553 * linux/fs/nfs/write.c
554 */
555 extern int nfs_congestion_kb;
556 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
557 extern int nfs_writepages(struct address_space *, struct writeback_control *);
558 extern int nfs_flush_incompatible(struct file *file, struct page *page);
559 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
560
561 /*
562 * Try to write back everything synchronously (but check the
563 * return value!)
564 */
565 extern int nfs_sync_inode(struct inode *inode);
566 extern int nfs_wb_all(struct inode *inode);
567 extern int nfs_wb_page(struct inode *inode, struct page *page);
568 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
569 extern int nfs_commit_inode(struct inode *, int);
570 extern struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail);
571 extern void nfs_commit_free(struct nfs_commit_data *data);
572
573 static inline int
nfs_have_writebacks(struct inode * inode)574 nfs_have_writebacks(struct inode *inode)
575 {
576 return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
577 }
578
579 /*
580 * linux/fs/nfs/read.c
581 */
582 extern int nfs_readpage(struct file *, struct page *);
583 extern int nfs_readpages(struct file *, struct address_space *,
584 struct list_head *, unsigned);
585
586 /*
587 * inline functions
588 */
589
nfs_size_to_loff_t(__u64 size)590 static inline loff_t nfs_size_to_loff_t(__u64 size)
591 {
592 return min_t(u64, size, OFFSET_MAX);
593 }
594
595 static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)596 nfs_fileid_to_ino_t(u64 fileid)
597 {
598 ino_t ino = (ino_t) fileid;
599 if (sizeof(ino_t) < sizeof(u64))
600 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
601 return ino;
602 }
603
604 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
605
606
607 # undef ifdebug
608 # ifdef NFS_DEBUG
609 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
610 # define NFS_IFDEBUG(x) x
611 # else
612 # define ifdebug(fac) if (0)
613 # define NFS_IFDEBUG(x)
614 # endif
615 #endif
616
