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 __rcu *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 pgoff_t page_index;
107 signed char duped;
108 };
109
110 /*
111 * NFSv4 delegation
112 */
113 struct nfs_delegation;
114
115 struct posix_acl;
116
117 struct nfs4_xattr_cache;
118
119 /*
120 * nfs fs inode data in memory
121 */
122 struct nfs_inode {
123 /*
124 * The 64bit 'inode number'
125 */
126 __u64 fileid;
127
128 /*
129 * NFS file handle
130 */
131 struct nfs_fh fh;
132
133 /*
134 * Various flags
135 */
136 unsigned long flags; /* atomic bit ops */
137 unsigned long cache_validity; /* bit mask */
138
139 /*
140 * read_cache_jiffies is when we started read-caching this inode.
141 * attrtimeo is for how long the cached information is assumed
142 * to be valid. A successful attribute revalidation doubles
143 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
144 * acregmin/acdirmin.
145 *
146 * We need to revalidate the cached attrs for this inode if
147 *
148 * jiffies - read_cache_jiffies >= attrtimeo
149 *
150 * Please note the comparison is greater than or equal
151 * so that zero timeout values can be specified.
152 */
153 unsigned long read_cache_jiffies;
154 unsigned long attrtimeo;
155 unsigned long attrtimeo_timestamp;
156
157 unsigned long attr_gencount;
158
159 struct rb_root access_cache;
160 struct list_head access_cache_entry_lru;
161 struct list_head access_cache_inode_lru;
162
163 union {
164 /* Directory */
165 struct {
166 /* "Generation counter" for the attribute cache.
167 * This is bumped whenever we update the metadata
168 * on the server.
169 */
170 unsigned long cache_change_attribute;
171 /*
172 * This is the cookie verifier used for NFSv3 readdir
173 * operations
174 */
175 __be32 cookieverf[NFS_DIR_VERIFIER_SIZE];
176 /* Readers: in-flight sillydelete RPC calls */
177 /* Writers: rmdir */
178 struct rw_semaphore rmdir_sem;
179 };
180 /* Regular file */
181 struct {
182 atomic_long_t nrequests;
183 struct nfs_mds_commit_info commit_info;
184 struct mutex commit_mutex;
185 };
186 };
187
188 /* Open contexts for shared mmap writes */
189 struct list_head open_files;
190
191 #if IS_ENABLED(CONFIG_NFS_V4)
192 struct nfs4_cached_acl *nfs4_acl;
193 /* NFSv4 state */
194 struct list_head open_states;
195 struct nfs_delegation __rcu *delegation;
196 struct rw_semaphore rwsem;
197
198 /* pNFS layout information */
199 struct pnfs_layout_hdr *layout;
200 #endif /* CONFIG_NFS_V4*/
201 /* how many bytes have been written/read and how many bytes queued up */
202 __u64 write_io;
203 __u64 read_io;
204 #ifdef CONFIG_NFS_FSCACHE
205 struct fscache_cookie *fscache;
206 #endif
207 struct inode vfs_inode;
208
209 #ifdef CONFIG_NFS_V4_2
210 struct nfs4_xattr_cache *xattr_cache;
211 #endif
212 };
213
214 struct nfs4_copy_state {
215 struct list_head copies;
216 struct list_head src_copies;
217 nfs4_stateid stateid;
218 struct completion completion;
219 uint64_t count;
220 struct nfs_writeverf verf;
221 int error;
222 int flags;
223 struct nfs4_state *parent_src_state;
224 struct nfs4_state *parent_dst_state;
225 };
226
227 /*
228 * Access bit flags
229 */
230 #define NFS_ACCESS_READ 0x0001
231 #define NFS_ACCESS_LOOKUP 0x0002
232 #define NFS_ACCESS_MODIFY 0x0004
233 #define NFS_ACCESS_EXTEND 0x0008
234 #define NFS_ACCESS_DELETE 0x0010
235 #define NFS_ACCESS_EXECUTE 0x0020
236 #define NFS_ACCESS_XAREAD 0x0040
237 #define NFS_ACCESS_XAWRITE 0x0080
238 #define NFS_ACCESS_XALIST 0x0100
239
240 /*
241 * Cache validity bit flags
242 */
243 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */
244 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */
245 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */
246 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */
247 #define NFS_INO_REVAL_PAGECACHE BIT(5) /* must revalidate pagecache */
248 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */
249 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */
250 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */
251 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */
252 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */
253 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */
254 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */
255 #define NFS_INO_DATA_INVAL_DEFER \
256 BIT(13) /* Deferred cache invalidation */
257 #define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */
258 #define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */
259 #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */
260 #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */
261
262 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \
263 | NFS_INO_INVALID_CTIME \
264 | NFS_INO_INVALID_MTIME \
265 | NFS_INO_INVALID_SIZE \
266 | NFS_INO_INVALID_NLINK \
267 | NFS_INO_INVALID_MODE \
268 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */
269
270 /*
271 * Bit offsets in flags field
272 */
273 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
274 #define NFS_INO_STALE (1) /* possible stale inode */
275 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
276 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
277 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
278 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
279 #define NFS_INO_FORCE_READDIR (7) /* force readdirplus */
280 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
281 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
282 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
283 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */
284
NFS_I(const struct inode * inode)285 static inline struct nfs_inode *NFS_I(const struct inode *inode)
286 {
287 return container_of(inode, struct nfs_inode, vfs_inode);
288 }
289
NFS_SB(const struct super_block * s)290 static inline struct nfs_server *NFS_SB(const struct super_block *s)
291 {
292 return (struct nfs_server *)(s->s_fs_info);
293 }
294
NFS_FH(const struct inode * inode)295 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
296 {
297 return &NFS_I(inode)->fh;
298 }
299
NFS_SERVER(const struct inode * inode)300 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
301 {
302 return NFS_SB(inode->i_sb);
303 }
304
NFS_CLIENT(const struct inode * inode)305 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
306 {
307 return NFS_SERVER(inode)->client;
308 }
309
NFS_PROTO(const struct inode * inode)310 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
311 {
312 return NFS_SERVER(inode)->nfs_client->rpc_ops;
313 }
314
NFS_MINATTRTIMEO(const struct inode * inode)315 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
316 {
317 struct nfs_server *nfss = NFS_SERVER(inode);
318 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
319 }
320
NFS_MAXATTRTIMEO(const struct inode * inode)321 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
322 {
323 struct nfs_server *nfss = NFS_SERVER(inode);
324 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
325 }
326
NFS_STALE(const struct inode * inode)327 static inline int NFS_STALE(const struct inode *inode)
328 {
329 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
330 }
331
nfs_i_fscache(struct inode * inode)332 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
333 {
334 #ifdef CONFIG_NFS_FSCACHE
335 return NFS_I(inode)->fscache;
336 #else
337 return NULL;
338 #endif
339 }
340
NFS_FILEID(const struct inode * inode)341 static inline __u64 NFS_FILEID(const struct inode *inode)
342 {
343 return NFS_I(inode)->fileid;
344 }
345
set_nfs_fileid(struct inode * inode,__u64 fileid)346 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
347 {
348 NFS_I(inode)->fileid = fileid;
349 }
350
nfs_mark_for_revalidate(struct inode * inode)351 static inline void nfs_mark_for_revalidate(struct inode *inode)
352 {
353 struct nfs_inode *nfsi = NFS_I(inode);
354
355 spin_lock(&inode->i_lock);
356 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE
357 | NFS_INO_INVALID_ACCESS
358 | NFS_INO_INVALID_ACL
359 | NFS_INO_INVALID_CHANGE
360 | NFS_INO_INVALID_CTIME;
361 if (S_ISDIR(inode->i_mode))
362 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
363 spin_unlock(&inode->i_lock);
364 }
365
nfs_server_capable(struct inode * inode,int cap)366 static inline int nfs_server_capable(struct inode *inode, int cap)
367 {
368 return NFS_SERVER(inode)->caps & cap;
369 }
370
371 /**
372 * nfs_save_change_attribute - Returns the inode attribute change cookie
373 * @dir - pointer to parent directory inode
374 * The "cache change attribute" is updated when we need to revalidate
375 * our dentry cache after a directory was seen to change on the server.
376 */
nfs_save_change_attribute(struct inode * dir)377 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
378 {
379 return NFS_I(dir)->cache_change_attribute;
380 }
381
382 /*
383 * linux/fs/nfs/inode.c
384 */
385 extern int nfs_sync_mapping(struct address_space *mapping);
386 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
387 extern void nfs_zap_caches(struct inode *);
388 extern void nfs_set_inode_stale(struct inode *inode);
389 extern void nfs_invalidate_atime(struct inode *);
390 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
391 struct nfs_fattr *);
392 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
393 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
394 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
395 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
396 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
397 extern int nfs_getattr(struct user_namespace *, const struct path *,
398 struct kstat *, u32, unsigned int);
399 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
400 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
401 extern int nfs_permission(struct user_namespace *, struct inode *, int);
402 extern int nfs_open(struct inode *, struct file *);
403 extern int nfs_attribute_cache_expired(struct inode *inode);
404 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);
405 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
406 extern int nfs_clear_invalid_mapping(struct address_space *mapping);
407 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
408 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
409 extern int nfs_revalidate_mapping_rcu(struct inode *inode);
410 extern int nfs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
411 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
412 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr);
413 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
414 extern void put_nfs_open_context(struct nfs_open_context *ctx);
415 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
416 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
417 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
418 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
419 extern void nfs_file_clear_open_context(struct file *flip);
420 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
421 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
422 extern u64 nfs_compat_user_ino64(u64 fileid);
423 extern void nfs_fattr_init(struct nfs_fattr *fattr);
424 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
425 extern unsigned long nfs_inc_attr_generation_counter(void);
426
427 extern struct nfs_fattr *nfs_alloc_fattr(void);
428 extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server);
429
nfs4_label_free(struct nfs4_label * label)430 static inline void nfs4_label_free(struct nfs4_label *label)
431 {
432 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
433 if (label) {
434 kfree(label->label);
435 kfree(label);
436 }
437 #endif
438 }
439
nfs_free_fattr(const struct nfs_fattr * fattr)440 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
441 {
442 if (fattr)
443 nfs4_label_free(fattr->label);
444 kfree(fattr);
445 }
446
447 extern struct nfs_fh *nfs_alloc_fhandle(void);
448
nfs_free_fhandle(const struct nfs_fh * fh)449 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
450 {
451 kfree(fh);
452 }
453
454 #ifdef NFS_DEBUG
455 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
nfs_display_fhandle_hash(const struct nfs_fh * fh)456 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
457 {
458 return _nfs_display_fhandle_hash(fh);
459 }
460 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
461 #define nfs_display_fhandle(fh, caption) \
462 do { \
463 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
464 _nfs_display_fhandle(fh, caption); \
465 } while (0)
466 #else
nfs_display_fhandle_hash(const struct nfs_fh * fh)467 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
468 {
469 return 0;
470 }
nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)471 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
472 const char *caption)
473 {
474 }
475 #endif
476
477 /*
478 * linux/fs/nfs/nfsroot.c
479 */
480 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
481 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
482 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
483
484 /*
485 * linux/fs/nfs/file.c
486 */
487 extern const struct file_operations nfs_file_operations;
488 #if IS_ENABLED(CONFIG_NFS_V4)
489 extern const struct file_operations nfs4_file_operations;
490 #endif /* CONFIG_NFS_V4 */
491 extern const struct address_space_operations nfs_file_aops;
492 extern const struct address_space_operations nfs_dir_aops;
493
nfs_file_open_context(struct file * filp)494 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
495 {
496 return filp->private_data;
497 }
498
nfs_file_cred(struct file * file)499 static inline const struct cred *nfs_file_cred(struct file *file)
500 {
501 if (file != NULL) {
502 struct nfs_open_context *ctx =
503 nfs_file_open_context(file);
504 if (ctx)
505 return ctx->cred;
506 }
507 return NULL;
508 }
509
510 /*
511 * linux/fs/nfs/direct.c
512 */
513 extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *);
514 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
515 struct iov_iter *iter);
516 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
517 struct iov_iter *iter);
518
519 /*
520 * linux/fs/nfs/dir.c
521 */
522 extern const struct file_operations nfs_dir_operations;
523 extern const struct dentry_operations nfs_dentry_operations;
524
525 extern void nfs_force_lookup_revalidate(struct inode *dir);
526 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);
527 #if IS_ENABLED(CONFIG_NFS_V4)
528 extern void nfs_clear_verifier_delegated(struct inode *inode);
529 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
530 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
531 struct nfs_fh *fh, struct nfs_fattr *fattr);
532 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
533 struct nfs_fattr *fattr);
534 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
535 extern void nfs_access_zap_cache(struct inode *inode);
536 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res,
537 bool may_block);
538
539 /*
540 * linux/fs/nfs/symlink.c
541 */
542 extern const struct inode_operations nfs_symlink_inode_operations;
543
544 /*
545 * linux/fs/nfs/sysctl.c
546 */
547 #ifdef CONFIG_SYSCTL
548 extern int nfs_register_sysctl(void);
549 extern void nfs_unregister_sysctl(void);
550 #else
551 #define nfs_register_sysctl() 0
552 #define nfs_unregister_sysctl() do { } while(0)
553 #endif
554
555 /*
556 * linux/fs/nfs/namespace.c
557 */
558 extern const struct inode_operations nfs_mountpoint_inode_operations;
559 extern const struct inode_operations nfs_referral_inode_operations;
560 extern int nfs_mountpoint_expiry_timeout;
561 extern void nfs_release_automount_timer(void);
562
563 /*
564 * linux/fs/nfs/unlink.c
565 */
566 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
567
568 /*
569 * linux/fs/nfs/write.c
570 */
571 extern int nfs_congestion_kb;
572 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
573 extern int nfs_writepages(struct address_space *, struct writeback_control *);
574 extern int nfs_flush_incompatible(struct file *file, struct page *page);
575 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
576
577 /*
578 * Try to write back everything synchronously (but check the
579 * return value!)
580 */
581 extern int nfs_sync_inode(struct inode *inode);
582 extern int nfs_wb_all(struct inode *inode);
583 extern int nfs_wb_page(struct inode *inode, struct page *page);
584 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
585 extern int nfs_commit_inode(struct inode *, int);
586 extern struct nfs_commit_data *nfs_commitdata_alloc(bool never_fail);
587 extern void nfs_commit_free(struct nfs_commit_data *data);
588 bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
589
590 static inline int
nfs_have_writebacks(struct inode * inode)591 nfs_have_writebacks(struct inode *inode)
592 {
593 if (S_ISREG(inode->i_mode))
594 return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
595 return 0;
596 }
597
598 /*
599 * linux/fs/nfs/read.c
600 */
601 extern int nfs_readpage(struct file *, struct page *);
602 extern int nfs_readpages(struct file *, struct address_space *,
603 struct list_head *, unsigned);
604
605 /*
606 * inline functions
607 */
608
nfs_size_to_loff_t(__u64 size)609 static inline loff_t nfs_size_to_loff_t(__u64 size)
610 {
611 return min_t(u64, size, OFFSET_MAX);
612 }
613
614 static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)615 nfs_fileid_to_ino_t(u64 fileid)
616 {
617 ino_t ino = (ino_t) fileid;
618 if (sizeof(ino_t) < sizeof(u64))
619 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
620 return ino;
621 }
622
623 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
624
625
626 # undef ifdebug
627 # ifdef NFS_DEBUG
628 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
629 # define NFS_IFDEBUG(x) x
630 # else
631 # define ifdebug(fac) if (0)
632 # define NFS_IFDEBUG(x)
633 # endif
634 #endif
635