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 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 atomic_long_t redirtied_pages;
184 struct nfs_mds_commit_info commit_info;
185 struct mutex commit_mutex;
186 };
187 };
188
189 /* Open contexts for shared mmap writes */
190 struct list_head open_files;
191
192 #if IS_ENABLED(CONFIG_NFS_V4)
193 struct nfs4_cached_acl *nfs4_acl;
194 /* NFSv4 state */
195 struct list_head open_states;
196 struct nfs_delegation __rcu *delegation;
197 struct rw_semaphore rwsem;
198
199 /* pNFS layout information */
200 struct pnfs_layout_hdr *layout;
201 #endif /* CONFIG_NFS_V4*/
202 /* how many bytes have been written/read and how many bytes queued up */
203 __u64 write_io;
204 __u64 read_io;
205 #ifdef CONFIG_NFS_FSCACHE
206 struct fscache_cookie *fscache;
207 #endif
208 struct inode vfs_inode;
209
210 #ifdef CONFIG_NFS_V4_2
211 struct nfs4_xattr_cache *xattr_cache;
212 #endif
213 };
214
215 struct nfs4_copy_state {
216 struct list_head copies;
217 struct list_head src_copies;
218 nfs4_stateid stateid;
219 struct completion completion;
220 uint64_t count;
221 struct nfs_writeverf verf;
222 int error;
223 int flags;
224 struct nfs4_state *parent_src_state;
225 struct nfs4_state *parent_dst_state;
226 };
227
228 /*
229 * Access bit flags
230 */
231 #define NFS_ACCESS_READ 0x0001
232 #define NFS_ACCESS_LOOKUP 0x0002
233 #define NFS_ACCESS_MODIFY 0x0004
234 #define NFS_ACCESS_EXTEND 0x0008
235 #define NFS_ACCESS_DELETE 0x0010
236 #define NFS_ACCESS_EXECUTE 0x0020
237 #define NFS_ACCESS_XAREAD 0x0040
238 #define NFS_ACCESS_XAWRITE 0x0080
239 #define NFS_ACCESS_XALIST 0x0100
240
241 /*
242 * Cache validity bit flags
243 */
244 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */
245 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */
246 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */
247 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */
248 #define NFS_INO_REVAL_PAGECACHE BIT(5) /* must revalidate pagecache */
249 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */
250 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */
251 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */
252 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */
253 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */
254 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */
255 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */
256 #define NFS_INO_DATA_INVAL_DEFER \
257 BIT(13) /* Deferred cache invalidation */
258 #define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */
259 #define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */
260 #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */
261 #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */
262
263 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \
264 | NFS_INO_INVALID_CTIME \
265 | NFS_INO_INVALID_MTIME \
266 | NFS_INO_INVALID_SIZE \
267 | NFS_INO_INVALID_NLINK \
268 | NFS_INO_INVALID_MODE \
269 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */
270
271 /*
272 * Bit offsets in flags field
273 */
274 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
275 #define NFS_INO_STALE (1) /* possible stale inode */
276 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
277 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
278 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
279 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
280 #define NFS_INO_FORCE_READDIR (7) /* force readdirplus */
281 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
282 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
283 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
284 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */
285
NFS_I(const struct inode * inode)286 static inline struct nfs_inode *NFS_I(const struct inode *inode)
287 {
288 return container_of(inode, struct nfs_inode, vfs_inode);
289 }
290
NFS_SB(const struct super_block * s)291 static inline struct nfs_server *NFS_SB(const struct super_block *s)
292 {
293 return (struct nfs_server *)(s->s_fs_info);
294 }
295
NFS_FH(const struct inode * inode)296 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
297 {
298 return &NFS_I(inode)->fh;
299 }
300
NFS_SERVER(const struct inode * inode)301 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
302 {
303 return NFS_SB(inode->i_sb);
304 }
305
NFS_CLIENT(const struct inode * inode)306 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
307 {
308 return NFS_SERVER(inode)->client;
309 }
310
NFS_PROTO(const struct inode * inode)311 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
312 {
313 return NFS_SERVER(inode)->nfs_client->rpc_ops;
314 }
315
NFS_MINATTRTIMEO(const struct inode * inode)316 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
317 {
318 struct nfs_server *nfss = NFS_SERVER(inode);
319 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
320 }
321
NFS_MAXATTRTIMEO(const struct inode * inode)322 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
323 {
324 struct nfs_server *nfss = NFS_SERVER(inode);
325 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
326 }
327
NFS_STALE(const struct inode * inode)328 static inline int NFS_STALE(const struct inode *inode)
329 {
330 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
331 }
332
nfs_i_fscache(struct inode * inode)333 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
334 {
335 #ifdef CONFIG_NFS_FSCACHE
336 return NFS_I(inode)->fscache;
337 #else
338 return NULL;
339 #endif
340 }
341
NFS_FILEID(const struct inode * inode)342 static inline __u64 NFS_FILEID(const struct inode *inode)
343 {
344 return NFS_I(inode)->fileid;
345 }
346
set_nfs_fileid(struct inode * inode,__u64 fileid)347 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
348 {
349 NFS_I(inode)->fileid = fileid;
350 }
351
nfs_mark_for_revalidate(struct inode * inode)352 static inline void nfs_mark_for_revalidate(struct inode *inode)
353 {
354 struct nfs_inode *nfsi = NFS_I(inode);
355
356 spin_lock(&inode->i_lock);
357 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE
358 | NFS_INO_INVALID_ACCESS
359 | NFS_INO_INVALID_ACL
360 | NFS_INO_INVALID_CHANGE
361 | NFS_INO_INVALID_CTIME;
362 if (S_ISDIR(inode->i_mode))
363 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
364 spin_unlock(&inode->i_lock);
365 }
366
nfs_server_capable(struct inode * inode,int cap)367 static inline int nfs_server_capable(struct inode *inode, int cap)
368 {
369 return NFS_SERVER(inode)->caps & cap;
370 }
371
372 /**
373 * nfs_save_change_attribute - Returns the inode attribute change cookie
374 * @dir - pointer to parent directory inode
375 * The "cache change attribute" is updated when we need to revalidate
376 * our dentry cache after a directory was seen to change on the server.
377 */
nfs_save_change_attribute(struct inode * dir)378 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
379 {
380 return NFS_I(dir)->cache_change_attribute;
381 }
382
383 /*
384 * linux/fs/nfs/inode.c
385 */
386 extern int nfs_sync_mapping(struct address_space *mapping);
387 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
388 extern void nfs_zap_caches(struct inode *);
389 extern void nfs_set_inode_stale(struct inode *inode);
390 extern void nfs_invalidate_atime(struct inode *);
391 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
392 struct nfs_fattr *, struct nfs4_label *);
393 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
394 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
395 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
396 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
397 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
398 extern int nfs_getattr(struct user_namespace *, const struct path *,
399 struct kstat *, u32, unsigned int);
400 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
401 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
402 extern int nfs_permission(struct user_namespace *, struct inode *, int);
403 extern int nfs_open(struct inode *, struct file *);
404 extern int nfs_attribute_cache_expired(struct inode *inode);
405 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);
406 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
407 extern int nfs_clear_invalid_mapping(struct address_space *mapping);
408 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
409 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
410 extern int nfs_revalidate_mapping_rcu(struct inode *inode);
411 extern int nfs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
412 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
413 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
414 struct nfs4_label *label);
415 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
416 extern void put_nfs_open_context(struct nfs_open_context *ctx);
417 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
418 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
419 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
420 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
421 extern void nfs_file_clear_open_context(struct file *flip);
422 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
423 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
424 extern u64 nfs_compat_user_ino64(u64 fileid);
425 extern void nfs_fattr_init(struct nfs_fattr *fattr);
426 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
427 extern unsigned long nfs_inc_attr_generation_counter(void);
428
429 extern struct nfs_fattr *nfs_alloc_fattr(void);
430 extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server);
431
nfs4_label_free(struct nfs4_label * label)432 static inline void nfs4_label_free(struct nfs4_label *label)
433 {
434 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
435 if (label) {
436 kfree(label->label);
437 kfree(label);
438 }
439 #endif
440 }
441
nfs_free_fattr(const struct nfs_fattr * fattr)442 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
443 {
444 if (fattr)
445 nfs4_label_free(fattr->label);
446 kfree(fattr);
447 }
448
449 extern struct nfs_fh *nfs_alloc_fhandle(void);
450
nfs_free_fhandle(const struct nfs_fh * fh)451 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
452 {
453 kfree(fh);
454 }
455
456 #ifdef NFS_DEBUG
457 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
nfs_display_fhandle_hash(const struct nfs_fh * fh)458 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
459 {
460 return _nfs_display_fhandle_hash(fh);
461 }
462 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
463 #define nfs_display_fhandle(fh, caption) \
464 do { \
465 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
466 _nfs_display_fhandle(fh, caption); \
467 } while (0)
468 #else
nfs_display_fhandle_hash(const struct nfs_fh * fh)469 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
470 {
471 return 0;
472 }
nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)473 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
474 const char *caption)
475 {
476 }
477 #endif
478
479 /*
480 * linux/fs/nfs/nfsroot.c
481 */
482 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
483 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
484 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
485
486 /*
487 * linux/fs/nfs/file.c
488 */
489 extern const struct file_operations nfs_file_operations;
490 #if IS_ENABLED(CONFIG_NFS_V4)
491 extern const struct file_operations nfs4_file_operations;
492 #endif /* CONFIG_NFS_V4 */
493 extern const struct address_space_operations nfs_file_aops;
494 extern const struct address_space_operations nfs_dir_aops;
495
nfs_file_open_context(struct file * filp)496 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
497 {
498 return filp->private_data;
499 }
500
nfs_file_cred(struct file * file)501 static inline const struct cred *nfs_file_cred(struct file *file)
502 {
503 if (file != NULL) {
504 struct nfs_open_context *ctx =
505 nfs_file_open_context(file);
506 if (ctx)
507 return ctx->cred;
508 }
509 return NULL;
510 }
511
512 /*
513 * linux/fs/nfs/direct.c
514 */
515 extern ssize_t nfs_direct_IO(struct kiocb *, struct iov_iter *);
516 ssize_t nfs_file_direct_read(struct kiocb *iocb,
517 struct iov_iter *iter, bool swap);
518 ssize_t nfs_file_direct_write(struct kiocb *iocb,
519 struct iov_iter *iter, bool swap);
520
521 /*
522 * linux/fs/nfs/dir.c
523 */
524 extern const struct file_operations nfs_dir_operations;
525 extern const struct dentry_operations nfs_dentry_operations;
526
527 extern void nfs_force_lookup_revalidate(struct inode *dir);
528 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);
529 #if IS_ENABLED(CONFIG_NFS_V4)
530 extern void nfs_clear_verifier_delegated(struct inode *inode);
531 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
532 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
533 struct nfs_fh *fh, struct nfs_fattr *fattr,
534 struct nfs4_label *label);
535 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
536 struct nfs_fattr *fattr, struct nfs4_label *label);
537 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
538 extern void nfs_access_zap_cache(struct inode *inode);
539 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred,
540 u32 *mask, bool may_block);
541
542 /*
543 * linux/fs/nfs/symlink.c
544 */
545 extern const struct inode_operations nfs_symlink_inode_operations;
546
547 /*
548 * linux/fs/nfs/sysctl.c
549 */
550 #ifdef CONFIG_SYSCTL
551 extern int nfs_register_sysctl(void);
552 extern void nfs_unregister_sysctl(void);
553 #else
554 #define nfs_register_sysctl() 0
555 #define nfs_unregister_sysctl() do { } while(0)
556 #endif
557
558 /*
559 * linux/fs/nfs/namespace.c
560 */
561 extern const struct inode_operations nfs_mountpoint_inode_operations;
562 extern const struct inode_operations nfs_referral_inode_operations;
563 extern int nfs_mountpoint_expiry_timeout;
564 extern void nfs_release_automount_timer(void);
565
566 /*
567 * linux/fs/nfs/unlink.c
568 */
569 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
570
571 /*
572 * linux/fs/nfs/write.c
573 */
574 extern int nfs_congestion_kb;
575 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
576 extern int nfs_writepages(struct address_space *, struct writeback_control *);
577 extern int nfs_flush_incompatible(struct file *file, struct page *page);
578 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
579
580 /*
581 * Try to write back everything synchronously (but check the
582 * return value!)
583 */
584 extern int nfs_sync_inode(struct inode *inode);
585 extern int nfs_wb_all(struct inode *inode);
586 extern int nfs_wb_page(struct inode *inode, struct page *page);
587 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
588 extern int nfs_commit_inode(struct inode *, int);
589 extern struct nfs_commit_data *nfs_commitdata_alloc(void);
590 extern void nfs_commit_free(struct nfs_commit_data *data);
591 bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
592
593 static inline int
nfs_have_writebacks(struct inode * inode)594 nfs_have_writebacks(struct inode *inode)
595 {
596 if (S_ISREG(inode->i_mode))
597 return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
598 return 0;
599 }
600
601 /*
602 * linux/fs/nfs/read.c
603 */
604 extern int nfs_readpage(struct file *, struct page *);
605 extern int nfs_readpages(struct file *, struct address_space *,
606 struct list_head *, unsigned);
607
608 /*
609 * inline functions
610 */
611
nfs_size_to_loff_t(__u64 size)612 static inline loff_t nfs_size_to_loff_t(__u64 size)
613 {
614 return min_t(u64, size, OFFSET_MAX);
615 }
616
617 static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)618 nfs_fileid_to_ino_t(u64 fileid)
619 {
620 ino_t ino = (ino_t) fileid;
621 if (sizeof(ino_t) < sizeof(u64))
622 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
623 return ino;
624 }
625
626 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
627
628
629 # undef ifdebug
630 # ifdef NFS_DEBUG
631 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
632 # define NFS_IFDEBUG(x) x
633 # else
634 # define ifdebug(fac) if (0)
635 # define NFS_IFDEBUG(x)
636 # endif
637 #endif
638