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 * Size of the NFS directory verifier
50 */
51 #define NFS_DIR_VERIFIER_SIZE 2
52
53 /*
54 * NFSv3/v4 Access mode cache entry
55 */
56 struct nfs_access_entry {
57 struct rb_node rb_node;
58 struct list_head lru;
59 kuid_t fsuid;
60 kgid_t fsgid;
61 struct group_info *group_info;
62 __u32 mask;
63 struct rcu_head rcu_head;
64 };
65
66 struct nfs_lock_context {
67 refcount_t count;
68 struct list_head list;
69 struct nfs_open_context *open_context;
70 fl_owner_t lockowner;
71 atomic_t io_count;
72 struct rcu_head rcu_head;
73 };
74
75 struct nfs4_state;
76 struct nfs_open_context {
77 struct nfs_lock_context lock_context;
78 fl_owner_t flock_owner;
79 struct dentry *dentry;
80 const struct cred *cred;
81 struct rpc_cred __rcu *ll_cred; /* low-level cred - use to check for expiry */
82 struct nfs4_state *state;
83 fmode_t mode;
84
85 unsigned long flags;
86 #define NFS_CONTEXT_BAD (2)
87 #define NFS_CONTEXT_UNLOCK (3)
88 #define NFS_CONTEXT_FILE_OPEN (4)
89 int error;
90
91 struct list_head list;
92 struct nfs4_threshold *mdsthreshold;
93 struct rcu_head rcu_head;
94 };
95
96 struct nfs_open_dir_context {
97 struct list_head list;
98 atomic_t cache_hits;
99 atomic_t cache_misses;
100 unsigned long attr_gencount;
101 __be32 verf[NFS_DIR_VERIFIER_SIZE];
102 __u64 dir_cookie;
103 __u64 last_cookie;
104 pgoff_t page_index;
105 unsigned int dtsize;
106 bool force_clear;
107 bool eof;
108 struct rcu_head rcu_head;
109 };
110
111 /*
112 * NFSv4 delegation
113 */
114 struct nfs_delegation;
115
116 struct posix_acl;
117
118 struct nfs4_xattr_cache;
119
120 /*
121 * nfs fs inode data in memory
122 */
123 struct nfs_inode {
124 /*
125 * The 64bit 'inode number'
126 */
127 __u64 fileid;
128
129 /*
130 * NFS file handle
131 */
132 struct nfs_fh fh;
133
134 /*
135 * Various flags
136 */
137 unsigned long flags; /* atomic bit ops */
138 unsigned long cache_validity; /* bit mask */
139
140 /*
141 * read_cache_jiffies is when we started read-caching this inode.
142 * attrtimeo is for how long the cached information is assumed
143 * to be valid. A successful attribute revalidation doubles
144 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
145 * acregmin/acdirmin.
146 *
147 * We need to revalidate the cached attrs for this inode if
148 *
149 * jiffies - read_cache_jiffies >= attrtimeo
150 *
151 * Please note the comparison is greater than or equal
152 * so that zero timeout values can be specified.
153 */
154 unsigned long read_cache_jiffies;
155 unsigned long attrtimeo;
156 unsigned long attrtimeo_timestamp;
157
158 unsigned long attr_gencount;
159
160 struct rb_root access_cache;
161 struct list_head access_cache_entry_lru;
162 struct list_head access_cache_inode_lru;
163
164 union {
165 /* Directory */
166 struct {
167 /* "Generation counter" for the attribute cache.
168 * This is bumped whenever we update the metadata
169 * on the server.
170 */
171 unsigned long cache_change_attribute;
172 /*
173 * This is the cookie verifier used for NFSv3 readdir
174 * operations
175 */
176 __be32 cookieverf[NFS_DIR_VERIFIER_SIZE];
177 /* Readers: in-flight sillydelete RPC calls */
178 /* Writers: rmdir */
179 struct rw_semaphore rmdir_sem;
180 };
181 /* Regular file */
182 struct {
183 atomic_long_t nrequests;
184 atomic_long_t redirtied_pages;
185 struct nfs_mds_commit_info commit_info;
186 struct mutex commit_mutex;
187 };
188 };
189
190 /* Open contexts for shared mmap writes */
191 struct list_head open_files;
192
193 #if IS_ENABLED(CONFIG_NFS_V4)
194 struct nfs4_cached_acl *nfs4_acl;
195 /* NFSv4 state */
196 struct list_head open_states;
197 struct nfs_delegation __rcu *delegation;
198 struct rw_semaphore rwsem;
199
200 /* pNFS layout information */
201 struct pnfs_layout_hdr *layout;
202 #endif /* CONFIG_NFS_V4*/
203 /* how many bytes have been written/read and how many bytes queued up */
204 __u64 write_io;
205 __u64 read_io;
206 #ifdef CONFIG_NFS_FSCACHE
207 struct fscache_cookie *fscache;
208 #endif
209 struct inode vfs_inode;
210
211 #ifdef CONFIG_NFS_V4_2
212 struct nfs4_xattr_cache *xattr_cache;
213 #endif
214 };
215
216 struct nfs4_copy_state {
217 struct list_head copies;
218 struct list_head src_copies;
219 nfs4_stateid stateid;
220 struct completion completion;
221 uint64_t count;
222 struct nfs_writeverf verf;
223 int error;
224 int flags;
225 struct nfs4_state *parent_src_state;
226 struct nfs4_state *parent_dst_state;
227 };
228
229 /*
230 * Access bit flags
231 */
232 #define NFS_ACCESS_READ 0x0001
233 #define NFS_ACCESS_LOOKUP 0x0002
234 #define NFS_ACCESS_MODIFY 0x0004
235 #define NFS_ACCESS_EXTEND 0x0008
236 #define NFS_ACCESS_DELETE 0x0010
237 #define NFS_ACCESS_EXECUTE 0x0020
238 #define NFS_ACCESS_XAREAD 0x0040
239 #define NFS_ACCESS_XAWRITE 0x0080
240 #define NFS_ACCESS_XALIST 0x0100
241
242 /*
243 * Cache validity bit flags
244 */
245 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */
246 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */
247 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */
248 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */
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_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_PRESERVE_UNLINKED (4) /* preserve file if removed while open */
278 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
279 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
280 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
281 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
282 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */
283
NFS_I(const struct inode * inode)284 static inline struct nfs_inode *NFS_I(const struct inode *inode)
285 {
286 return container_of(inode, struct nfs_inode, vfs_inode);
287 }
288
NFS_SB(const struct super_block * s)289 static inline struct nfs_server *NFS_SB(const struct super_block *s)
290 {
291 return (struct nfs_server *)(s->s_fs_info);
292 }
293
NFS_FH(const struct inode * inode)294 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
295 {
296 return &NFS_I(inode)->fh;
297 }
298
NFS_SERVER(const struct inode * inode)299 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
300 {
301 return NFS_SB(inode->i_sb);
302 }
303
NFS_CLIENT(const struct inode * inode)304 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
305 {
306 return NFS_SERVER(inode)->client;
307 }
308
NFS_PROTO(const struct inode * inode)309 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
310 {
311 return NFS_SERVER(inode)->nfs_client->rpc_ops;
312 }
313
NFS_MINATTRTIMEO(const struct inode * inode)314 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
315 {
316 struct nfs_server *nfss = NFS_SERVER(inode);
317 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
318 }
319
NFS_MAXATTRTIMEO(const struct inode * inode)320 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
321 {
322 struct nfs_server *nfss = NFS_SERVER(inode);
323 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
324 }
325
NFS_STALE(const struct inode * inode)326 static inline int NFS_STALE(const struct inode *inode)
327 {
328 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
329 }
330
nfs_i_fscache(struct inode * inode)331 static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
332 {
333 #ifdef CONFIG_NFS_FSCACHE
334 return NFS_I(inode)->fscache;
335 #else
336 return NULL;
337 #endif
338 }
339
NFS_FILEID(const struct inode * inode)340 static inline __u64 NFS_FILEID(const struct inode *inode)
341 {
342 return NFS_I(inode)->fileid;
343 }
344
set_nfs_fileid(struct inode * inode,__u64 fileid)345 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
346 {
347 NFS_I(inode)->fileid = fileid;
348 }
349
nfs_mark_for_revalidate(struct inode * inode)350 static inline void nfs_mark_for_revalidate(struct inode *inode)
351 {
352 struct nfs_inode *nfsi = NFS_I(inode);
353
354 spin_lock(&inode->i_lock);
355 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
356 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
357 NFS_INO_INVALID_SIZE;
358 if (S_ISDIR(inode->i_mode))
359 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
360 spin_unlock(&inode->i_lock);
361 }
362
nfs_server_capable(const struct inode * inode,int cap)363 static inline int nfs_server_capable(const struct inode *inode, int cap)
364 {
365 return NFS_SERVER(inode)->caps & cap;
366 }
367
368 /**
369 * nfs_save_change_attribute - Returns the inode attribute change cookie
370 * @dir - pointer to parent directory inode
371 * The "cache change attribute" is updated when we need to revalidate
372 * our dentry cache after a directory was seen to change on the server.
373 */
nfs_save_change_attribute(struct inode * dir)374 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
375 {
376 return NFS_I(dir)->cache_change_attribute;
377 }
378
379 /*
380 * linux/fs/nfs/inode.c
381 */
382 extern int nfs_sync_mapping(struct address_space *mapping);
383 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
384 extern void nfs_zap_caches(struct inode *);
385 extern void nfs_set_inode_stale(struct inode *inode);
386 extern void nfs_invalidate_atime(struct inode *);
387 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
388 struct nfs_fattr *);
389 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
390 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
391 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
392 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
393 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
394 extern int nfs_getattr(struct user_namespace *, const struct path *,
395 struct kstat *, u32, unsigned int);
396 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *, const struct cred *);
397 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
398 extern int nfs_permission(struct user_namespace *, struct inode *, int);
399 extern int nfs_open(struct inode *, struct file *);
400 extern int nfs_attribute_cache_expired(struct inode *inode);
401 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);
402 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
403 extern int nfs_clear_invalid_mapping(struct address_space *mapping);
404 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
405 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
406 extern int nfs_revalidate_mapping_rcu(struct inode *inode);
407 extern int nfs_setattr(struct user_namespace *, struct dentry *, struct iattr *);
408 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
409 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr);
410 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
411 extern void put_nfs_open_context(struct nfs_open_context *ctx);
412 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
413 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
414 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
415 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
416 extern void nfs_file_clear_open_context(struct file *flip);
417 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
418 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
419 extern u64 nfs_compat_user_ino64(u64 fileid);
420 extern void nfs_fattr_init(struct nfs_fattr *fattr);
421 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
422 extern unsigned long nfs_inc_attr_generation_counter(void);
423
424 extern struct nfs_fattr *nfs_alloc_fattr(void);
425 extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server);
426
nfs4_label_free(struct nfs4_label * label)427 static inline void nfs4_label_free(struct nfs4_label *label)
428 {
429 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
430 if (label) {
431 kfree(label->label);
432 kfree(label);
433 }
434 #endif
435 }
436
nfs_free_fattr(const struct nfs_fattr * fattr)437 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
438 {
439 if (fattr)
440 nfs4_label_free(fattr->label);
441 kfree(fattr);
442 }
443
444 extern struct nfs_fh *nfs_alloc_fhandle(void);
445
nfs_free_fhandle(const struct nfs_fh * fh)446 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
447 {
448 kfree(fh);
449 }
450
451 #ifdef NFS_DEBUG
452 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
nfs_display_fhandle_hash(const struct nfs_fh * fh)453 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
454 {
455 return _nfs_display_fhandle_hash(fh);
456 }
457 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
458 #define nfs_display_fhandle(fh, caption) \
459 do { \
460 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
461 _nfs_display_fhandle(fh, caption); \
462 } while (0)
463 #else
nfs_display_fhandle_hash(const struct nfs_fh * fh)464 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
465 {
466 return 0;
467 }
nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)468 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
469 const char *caption)
470 {
471 }
472 #endif
473
474 /*
475 * linux/fs/nfs/nfsroot.c
476 */
477 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
478 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
479 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
480
481 /*
482 * linux/fs/nfs/file.c
483 */
484 extern const struct file_operations nfs_file_operations;
485 #if IS_ENABLED(CONFIG_NFS_V4)
486 extern const struct file_operations nfs4_file_operations;
487 #endif /* CONFIG_NFS_V4 */
488 extern const struct address_space_operations nfs_file_aops;
489 extern const struct address_space_operations nfs_dir_aops;
490
nfs_file_open_context(struct file * filp)491 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
492 {
493 return filp->private_data;
494 }
495
nfs_file_cred(struct file * file)496 static inline const struct cred *nfs_file_cred(struct file *file)
497 {
498 if (file != NULL) {
499 struct nfs_open_context *ctx =
500 nfs_file_open_context(file);
501 if (ctx)
502 return ctx->cred;
503 }
504 return NULL;
505 }
506
507 /*
508 * linux/fs/nfs/direct.c
509 */
510 int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter);
511 ssize_t nfs_file_direct_read(struct kiocb *iocb,
512 struct iov_iter *iter, bool swap);
513 ssize_t nfs_file_direct_write(struct kiocb *iocb,
514 struct iov_iter *iter, bool swap);
515
516 /*
517 * linux/fs/nfs/dir.c
518 */
519 extern const struct file_operations nfs_dir_operations;
520 extern const struct dentry_operations nfs_dentry_operations;
521
522 extern void nfs_force_lookup_revalidate(struct inode *dir);
523 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);
524 #if IS_ENABLED(CONFIG_NFS_V4)
525 extern void nfs_clear_verifier_delegated(struct inode *inode);
526 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
527 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
528 struct nfs_fh *fh, struct nfs_fattr *fattr);
529 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
530 struct nfs_fattr *fattr);
531 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
532 extern void nfs_access_zap_cache(struct inode *inode);
533 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred,
534 u32 *mask, bool may_block);
535
536 /*
537 * linux/fs/nfs/symlink.c
538 */
539 extern const struct inode_operations nfs_symlink_inode_operations;
540
541 /*
542 * linux/fs/nfs/sysctl.c
543 */
544 #ifdef CONFIG_SYSCTL
545 extern int nfs_register_sysctl(void);
546 extern void nfs_unregister_sysctl(void);
547 #else
548 #define nfs_register_sysctl() 0
549 #define nfs_unregister_sysctl() do { } while(0)
550 #endif
551
552 /*
553 * linux/fs/nfs/namespace.c
554 */
555 extern const struct inode_operations nfs_mountpoint_inode_operations;
556 extern const struct inode_operations nfs_referral_inode_operations;
557 extern int nfs_mountpoint_expiry_timeout;
558 extern void nfs_release_automount_timer(void);
559
560 /*
561 * linux/fs/nfs/unlink.c
562 */
563 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
564
565 /*
566 * linux/fs/nfs/write.c
567 */
568 extern int nfs_congestion_kb;
569 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
570 extern int nfs_writepages(struct address_space *, struct writeback_control *);
571 extern int nfs_flush_incompatible(struct file *file, struct page *page);
572 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
573
574 /*
575 * Try to write back everything synchronously (but check the
576 * return value!)
577 */
578 extern int nfs_sync_inode(struct inode *inode);
579 extern int nfs_wb_all(struct inode *inode);
580 extern int nfs_wb_page(struct inode *inode, struct page *page);
581 int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio);
582 extern int nfs_commit_inode(struct inode *, int);
583 extern struct nfs_commit_data *nfs_commitdata_alloc(void);
584 extern void nfs_commit_free(struct nfs_commit_data *data);
585 bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
586
nfs_have_writebacks(const struct inode * inode)587 static inline bool nfs_have_writebacks(const struct inode *inode)
588 {
589 if (S_ISREG(inode->i_mode))
590 return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
591 return false;
592 }
593
594 /*
595 * linux/fs/nfs/read.c
596 */
597 int nfs_read_folio(struct file *, struct folio *);
598 void nfs_readahead(struct readahead_control *);
599
600 /*
601 * inline functions
602 */
603
nfs_size_to_loff_t(__u64 size)604 static inline loff_t nfs_size_to_loff_t(__u64 size)
605 {
606 return min_t(u64, size, OFFSET_MAX);
607 }
608
609 static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)610 nfs_fileid_to_ino_t(u64 fileid)
611 {
612 ino_t ino = (ino_t) fileid;
613 if (sizeof(ino_t) < sizeof(u64))
614 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
615 return ino;
616 }
617
618 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
619
620 /* We need to block new opens while a file is being unlinked.
621 * If it is opened *before* we decide to unlink, we will silly-rename
622 * instead. If it is opened *after*, then we need to create or will fail.
623 * If we allow the two to race, we could end up with a file that is open
624 * but deleted on the server resulting in ESTALE.
625 * So use ->d_fsdata to record when the unlink is happening
626 * and block dentry revalidation while it is set.
627 */
628 #define NFS_FSDATA_BLOCKED ((void*)1)
629
630 # undef ifdebug
631 # ifdef NFS_DEBUG
632 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
633 # define NFS_IFDEBUG(x) x
634 # else
635 # define ifdebug(fac) if (0)
636 # define NFS_IFDEBUG(x)
637 # endif
638 #endif
639