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 #ifdef CONFIG_NFS_FSCACHE
35 #include <linux/netfs.h>
36 #endif
37
38 #include <linux/nfs.h>
39 #include <linux/nfs2.h>
40 #include <linux/nfs3.h>
41 #include <linux/nfs4.h>
42 #include <linux/nfs_xdr.h>
43 #include <linux/nfs_fs_sb.h>
44
45 #include <linux/mempool.h>
46
47 /*
48 * These are the default for number of transports to different server IPs
49 */
50 #define NFS_MAX_TRANSPORTS 16
51
52 /*
53 * Size of the NFS directory verifier
54 */
55 #define NFS_DIR_VERIFIER_SIZE 2
56
57 /*
58 * NFSv3/v4 Access mode cache entry
59 */
60 struct nfs_access_entry {
61 struct rb_node rb_node;
62 struct list_head lru;
63 kuid_t fsuid;
64 kgid_t fsgid;
65 struct group_info *group_info;
66 u64 timestamp;
67 __u32 mask;
68 struct rcu_head rcu_head;
69 };
70
71 struct nfs_lock_context {
72 refcount_t count;
73 struct list_head list;
74 struct nfs_open_context *open_context;
75 fl_owner_t lockowner;
76 atomic_t io_count;
77 struct rcu_head rcu_head;
78 };
79
80 struct nfs4_state;
81 struct nfs_open_context {
82 struct nfs_lock_context lock_context;
83 fl_owner_t flock_owner;
84 struct dentry *dentry;
85 const struct cred *cred;
86 struct rpc_cred __rcu *ll_cred; /* low-level cred - use to check for expiry */
87 struct nfs4_state *state;
88 fmode_t mode;
89
90 unsigned long flags;
91 #define NFS_CONTEXT_BAD (2)
92 #define NFS_CONTEXT_UNLOCK (3)
93 #define NFS_CONTEXT_FILE_OPEN (4)
94 int error;
95
96 struct list_head list;
97 struct nfs4_threshold *mdsthreshold;
98 struct rcu_head rcu_head;
99 };
100
101 struct nfs_open_dir_context {
102 struct list_head list;
103 atomic_t cache_hits;
104 atomic_t cache_misses;
105 unsigned long attr_gencount;
106 __be32 verf[NFS_DIR_VERIFIER_SIZE];
107 __u64 dir_cookie;
108 __u64 last_cookie;
109 pgoff_t page_index;
110 unsigned int dtsize;
111 bool force_clear;
112 bool eof;
113 struct rcu_head rcu_head;
114 };
115
116 /*
117 * NFSv4 delegation
118 */
119 struct nfs_delegation;
120
121 struct posix_acl;
122
123 struct nfs4_xattr_cache;
124
125 /*
126 * nfs fs inode data in memory
127 */
128 struct nfs_inode {
129 /*
130 * The 64bit 'inode number'
131 */
132 __u64 fileid;
133
134 /*
135 * NFS file handle
136 */
137 struct nfs_fh fh;
138
139 /*
140 * Various flags
141 */
142 unsigned long flags; /* atomic bit ops */
143 unsigned long cache_validity; /* bit mask */
144
145 /*
146 * read_cache_jiffies is when we started read-caching this inode.
147 * attrtimeo is for how long the cached information is assumed
148 * to be valid. A successful attribute revalidation doubles
149 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
150 * acregmin/acdirmin.
151 *
152 * We need to revalidate the cached attrs for this inode if
153 *
154 * jiffies - read_cache_jiffies >= attrtimeo
155 *
156 * Please note the comparison is greater than or equal
157 * so that zero timeout values can be specified.
158 */
159 unsigned long read_cache_jiffies;
160 unsigned long attrtimeo;
161 unsigned long attrtimeo_timestamp;
162
163 unsigned long attr_gencount;
164
165 struct rb_root access_cache;
166 struct list_head access_cache_entry_lru;
167 struct list_head access_cache_inode_lru;
168
169 union {
170 /* Directory */
171 struct {
172 /* "Generation counter" for the attribute cache.
173 * This is bumped whenever we update the metadata
174 * on the server.
175 */
176 unsigned long cache_change_attribute;
177 /*
178 * This is the cookie verifier used for NFSv3 readdir
179 * operations
180 */
181 __be32 cookieverf[NFS_DIR_VERIFIER_SIZE];
182 /* Readers: in-flight sillydelete RPC calls */
183 /* Writers: rmdir */
184 struct rw_semaphore rmdir_sem;
185 };
186 /* Regular file */
187 struct {
188 atomic_long_t nrequests;
189 atomic_long_t redirtied_pages;
190 struct nfs_mds_commit_info commit_info;
191 struct mutex commit_mutex;
192 };
193 };
194
195 /* Open contexts for shared mmap writes */
196 struct list_head open_files;
197
198 /* Keep track of out-of-order replies.
199 * The ooo array contains start/end pairs of
200 * numbers from the changeid sequence when
201 * the inode's iversion has been updated.
202 * It also contains end/start pair (i.e. reverse order)
203 * of sections of the changeid sequence that have
204 * been seen in replies from the server.
205 * Normally these should match and when both
206 * A:B and B:A are found in ooo, they are both removed.
207 * And if a reply with A:B causes an iversion update
208 * of A:B, then neither are added.
209 * When a reply has pre_change that doesn't match
210 * iversion, then the changeid pair and any consequent
211 * change in iversion ARE added. Later replies
212 * might fill in the gaps, or possibly a gap is caused
213 * by a change from another client.
214 * When a file or directory is opened, if the ooo table
215 * is not empty, then we assume the gaps were due to
216 * another client and we invalidate the cached data.
217 *
218 * We can only track a limited number of concurrent gaps.
219 * Currently that limit is 16.
220 * We allocate the table on demand. If there is insufficient
221 * memory, then we probably cannot cache the file anyway
222 * so there is no loss.
223 */
224 struct {
225 int cnt;
226 struct {
227 u64 start, end;
228 } gap[16];
229 } *ooo;
230
231 #if IS_ENABLED(CONFIG_NFS_V4)
232 struct nfs4_cached_acl *nfs4_acl;
233 /* NFSv4 state */
234 struct list_head open_states;
235 struct nfs_delegation __rcu *delegation;
236 struct rw_semaphore rwsem;
237
238 /* pNFS layout information */
239 struct pnfs_layout_hdr *layout;
240 #endif /* CONFIG_NFS_V4*/
241 /* how many bytes have been written/read and how many bytes queued up */
242 __u64 write_io;
243 __u64 read_io;
244 #ifdef CONFIG_NFS_V4_2
245 struct nfs4_xattr_cache *xattr_cache;
246 #endif
247 union {
248 struct inode vfs_inode;
249 #ifdef CONFIG_NFS_FSCACHE
250 struct netfs_inode netfs; /* netfs context and VFS inode */
251 #endif
252 };
253 };
254
255 struct nfs4_copy_state {
256 struct list_head copies;
257 struct list_head src_copies;
258 nfs4_stateid stateid;
259 struct completion completion;
260 uint64_t count;
261 struct nfs_writeverf verf;
262 int error;
263 int flags;
264 struct nfs4_state *parent_src_state;
265 struct nfs4_state *parent_dst_state;
266 };
267
268 /*
269 * Access bit flags
270 */
271 #define NFS_ACCESS_READ 0x0001
272 #define NFS_ACCESS_LOOKUP 0x0002
273 #define NFS_ACCESS_MODIFY 0x0004
274 #define NFS_ACCESS_EXTEND 0x0008
275 #define NFS_ACCESS_DELETE 0x0010
276 #define NFS_ACCESS_EXECUTE 0x0020
277 #define NFS_ACCESS_XAREAD 0x0040
278 #define NFS_ACCESS_XAWRITE 0x0080
279 #define NFS_ACCESS_XALIST 0x0100
280
281 /*
282 * Cache validity bit flags
283 */
284 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */
285 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */
286 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */
287 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */
288 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */
289 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */
290 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */
291 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */
292 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */
293 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */
294 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */
295 #define NFS_INO_DATA_INVAL_DEFER \
296 BIT(13) /* Deferred cache invalidation */
297 #define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */
298 #define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */
299 #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */
300 #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */
301
302 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \
303 | NFS_INO_INVALID_CTIME \
304 | NFS_INO_INVALID_MTIME \
305 | NFS_INO_INVALID_SIZE \
306 | NFS_INO_INVALID_NLINK \
307 | NFS_INO_INVALID_MODE \
308 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */
309
310 /*
311 * Bit offsets in flags field
312 */
313 #define NFS_INO_STALE (1) /* possible stale inode */
314 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
315 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
316 #define NFS_INO_PRESERVE_UNLINKED (4) /* preserve file if removed while open */
317 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
318 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
319 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
320 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */
321
NFS_I(const struct inode * inode)322 static inline struct nfs_inode *NFS_I(const struct inode *inode)
323 {
324 return container_of(inode, struct nfs_inode, vfs_inode);
325 }
326
NFS_SB(const struct super_block * s)327 static inline struct nfs_server *NFS_SB(const struct super_block *s)
328 {
329 return (struct nfs_server *)(s->s_fs_info);
330 }
331
NFS_FH(const struct inode * inode)332 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
333 {
334 return &NFS_I(inode)->fh;
335 }
336
NFS_SERVER(const struct inode * inode)337 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
338 {
339 return NFS_SB(inode->i_sb);
340 }
341
NFS_CLIENT(const struct inode * inode)342 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
343 {
344 return NFS_SERVER(inode)->client;
345 }
346
NFS_PROTO(const struct inode * inode)347 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
348 {
349 return NFS_SERVER(inode)->nfs_client->rpc_ops;
350 }
351
NFS_MINATTRTIMEO(const struct inode * inode)352 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
353 {
354 struct nfs_server *nfss = NFS_SERVER(inode);
355 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
356 }
357
NFS_MAXATTRTIMEO(const struct inode * inode)358 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
359 {
360 struct nfs_server *nfss = NFS_SERVER(inode);
361 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
362 }
363
NFS_STALE(const struct inode * inode)364 static inline int NFS_STALE(const struct inode *inode)
365 {
366 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
367 }
368
NFS_FILEID(const struct inode * inode)369 static inline __u64 NFS_FILEID(const struct inode *inode)
370 {
371 return NFS_I(inode)->fileid;
372 }
373
set_nfs_fileid(struct inode * inode,__u64 fileid)374 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
375 {
376 NFS_I(inode)->fileid = fileid;
377 }
378
nfs_mark_for_revalidate(struct inode * inode)379 static inline void nfs_mark_for_revalidate(struct inode *inode)
380 {
381 struct nfs_inode *nfsi = NFS_I(inode);
382
383 spin_lock(&inode->i_lock);
384 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
385 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
386 NFS_INO_INVALID_SIZE;
387 if (S_ISDIR(inode->i_mode))
388 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
389 spin_unlock(&inode->i_lock);
390 }
391
nfs_server_capable(const struct inode * inode,int cap)392 static inline int nfs_server_capable(const struct inode *inode, int cap)
393 {
394 return NFS_SERVER(inode)->caps & cap;
395 }
396
397 /**
398 * nfs_save_change_attribute - Returns the inode attribute change cookie
399 * @dir - pointer to parent directory inode
400 * The "cache change attribute" is updated when we need to revalidate
401 * our dentry cache after a directory was seen to change on the server.
402 */
nfs_save_change_attribute(struct inode * dir)403 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
404 {
405 return NFS_I(dir)->cache_change_attribute;
406 }
407
408 /*
409 * linux/fs/nfs/inode.c
410 */
411 extern int nfs_sync_mapping(struct address_space *mapping);
412 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
413 extern void nfs_zap_caches(struct inode *);
414 extern void nfs_set_inode_stale(struct inode *inode);
415 extern void nfs_invalidate_atime(struct inode *);
416 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
417 struct nfs_fattr *);
418 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
419 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
420 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
421 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
422 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
423 extern int nfs_getattr(struct mnt_idmap *, const struct path *,
424 struct kstat *, u32, unsigned int);
425 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *, const struct cred *);
426 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
427 extern int nfs_permission(struct mnt_idmap *, struct inode *, int);
428 extern int nfs_open(struct inode *, struct file *);
429 extern int nfs_attribute_cache_expired(struct inode *inode);
430 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);
431 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
432 extern int nfs_clear_invalid_mapping(struct address_space *mapping);
433 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
434 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
435 extern int nfs_revalidate_mapping_rcu(struct inode *inode);
436 extern int nfs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *);
437 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
438 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr);
439 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
440 extern void put_nfs_open_context(struct nfs_open_context *ctx);
441 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
442 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
443 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
444 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
445 extern void nfs_file_clear_open_context(struct file *flip);
446 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
447 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
448 extern u64 nfs_compat_user_ino64(u64 fileid);
449 extern void nfs_fattr_init(struct nfs_fattr *fattr);
450 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
451 extern unsigned long nfs_inc_attr_generation_counter(void);
452
453 extern struct nfs_fattr *nfs_alloc_fattr(void);
454 extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server);
455
nfs4_label_free(struct nfs4_label * label)456 static inline void nfs4_label_free(struct nfs4_label *label)
457 {
458 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
459 if (label) {
460 kfree(label->label);
461 kfree(label);
462 }
463 #endif
464 }
465
nfs_free_fattr(const struct nfs_fattr * fattr)466 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
467 {
468 if (fattr)
469 nfs4_label_free(fattr->label);
470 kfree(fattr);
471 }
472
473 extern struct nfs_fh *nfs_alloc_fhandle(void);
474
nfs_free_fhandle(const struct nfs_fh * fh)475 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
476 {
477 kfree(fh);
478 }
479
480 #ifdef NFS_DEBUG
481 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
nfs_display_fhandle_hash(const struct nfs_fh * fh)482 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
483 {
484 return _nfs_display_fhandle_hash(fh);
485 }
486 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
487 #define nfs_display_fhandle(fh, caption) \
488 do { \
489 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
490 _nfs_display_fhandle(fh, caption); \
491 } while (0)
492 #else
nfs_display_fhandle_hash(const struct nfs_fh * fh)493 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
494 {
495 return 0;
496 }
nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)497 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
498 const char *caption)
499 {
500 }
501 #endif
502
503 /*
504 * linux/fs/nfs/nfsroot.c
505 */
506 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
507 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
508 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
509
510 /*
511 * linux/fs/nfs/file.c
512 */
513 extern const struct file_operations nfs_file_operations;
514 #if IS_ENABLED(CONFIG_NFS_V4)
515 extern const struct file_operations nfs4_file_operations;
516 #endif /* CONFIG_NFS_V4 */
517 extern const struct address_space_operations nfs_file_aops;
518 extern const struct address_space_operations nfs_dir_aops;
519
nfs_file_open_context(struct file * filp)520 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
521 {
522 return filp->private_data;
523 }
524
nfs_file_cred(struct file * file)525 static inline const struct cred *nfs_file_cred(struct file *file)
526 {
527 if (file != NULL) {
528 struct nfs_open_context *ctx =
529 nfs_file_open_context(file);
530 if (ctx)
531 return ctx->cred;
532 }
533 return NULL;
534 }
535
536 /*
537 * linux/fs/nfs/direct.c
538 */
539 int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter);
540 ssize_t nfs_file_direct_read(struct kiocb *iocb,
541 struct iov_iter *iter, bool swap);
542 ssize_t nfs_file_direct_write(struct kiocb *iocb,
543 struct iov_iter *iter, bool swap);
544
545 /*
546 * linux/fs/nfs/dir.c
547 */
548 extern const struct file_operations nfs_dir_operations;
549 extern const struct dentry_operations nfs_dentry_operations;
550
551 extern void nfs_force_lookup_revalidate(struct inode *dir);
552 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);
553 #if IS_ENABLED(CONFIG_NFS_V4)
554 extern void nfs_clear_verifier_delegated(struct inode *inode);
555 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
556 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
557 struct nfs_fh *fh, struct nfs_fattr *fattr);
558 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
559 struct nfs_fattr *fattr);
560 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
561 extern void nfs_access_zap_cache(struct inode *inode);
562 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred,
563 u32 *mask, bool may_block);
564 extern int nfs_atomic_open_v23(struct inode *dir, struct dentry *dentry,
565 struct file *file, unsigned int open_flags,
566 umode_t mode);
567
568 /*
569 * linux/fs/nfs/symlink.c
570 */
571 extern const struct inode_operations nfs_symlink_inode_operations;
572
573 /*
574 * linux/fs/nfs/sysctl.c
575 */
576 #ifdef CONFIG_SYSCTL
577 extern int nfs_register_sysctl(void);
578 extern void nfs_unregister_sysctl(void);
579 #else
580 #define nfs_register_sysctl() 0
581 #define nfs_unregister_sysctl() do { } while(0)
582 #endif
583
584 /*
585 * linux/fs/nfs/namespace.c
586 */
587 extern const struct inode_operations nfs_mountpoint_inode_operations;
588 extern const struct inode_operations nfs_referral_inode_operations;
589 extern int nfs_mountpoint_expiry_timeout;
590 extern void nfs_release_automount_timer(void);
591
592 /*
593 * linux/fs/nfs/unlink.c
594 */
595 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
596
597 /*
598 * linux/fs/nfs/write.c
599 */
600 extern int nfs_congestion_kb;
601 extern int nfs_writepages(struct address_space *, struct writeback_control *);
602 extern int nfs_flush_incompatible(struct file *file, struct folio *folio);
603 extern int nfs_update_folio(struct file *file, struct folio *folio,
604 unsigned int offset, unsigned int count);
605
606 /*
607 * Try to write back everything synchronously (but check the
608 * return value!)
609 */
610 extern int nfs_sync_inode(struct inode *inode);
611 extern int nfs_wb_all(struct inode *inode);
612 extern int nfs_wb_folio(struct inode *inode, struct folio *folio);
613 int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio);
614 extern int nfs_commit_inode(struct inode *, int);
615 extern struct nfs_commit_data *nfs_commitdata_alloc(void);
616 extern void nfs_commit_free(struct nfs_commit_data *data);
617 void nfs_commit_begin(struct nfs_mds_commit_info *cinfo);
618 bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
619
nfs_have_writebacks(const struct inode * inode)620 static inline bool nfs_have_writebacks(const struct inode *inode)
621 {
622 if (S_ISREG(inode->i_mode))
623 return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
624 return false;
625 }
626
627 /*
628 * linux/fs/nfs/read.c
629 */
630 int nfs_read_folio(struct file *, struct folio *);
631 void nfs_readahead(struct readahead_control *);
632
633 /*
634 * inline functions
635 */
636
nfs_size_to_loff_t(__u64 size)637 static inline loff_t nfs_size_to_loff_t(__u64 size)
638 {
639 return min_t(u64, size, OFFSET_MAX);
640 }
641
642 static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)643 nfs_fileid_to_ino_t(u64 fileid)
644 {
645 ino_t ino = (ino_t) fileid;
646 if (sizeof(ino_t) < sizeof(u64))
647 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
648 return ino;
649 }
650
nfs_ooo_clear(struct nfs_inode * nfsi)651 static inline void nfs_ooo_clear(struct nfs_inode *nfsi)
652 {
653 nfsi->cache_validity &= ~NFS_INO_DATA_INVAL_DEFER;
654 kfree(nfsi->ooo);
655 nfsi->ooo = NULL;
656 }
657
nfs_ooo_test(struct nfs_inode * nfsi)658 static inline bool nfs_ooo_test(struct nfs_inode *nfsi)
659 {
660 return (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) ||
661 (nfsi->ooo && nfsi->ooo->cnt > 0);
662
663 }
664
665 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
666
667 /* We need to block new opens while a file is being unlinked.
668 * If it is opened *before* we decide to unlink, we will silly-rename
669 * instead. If it is opened *after*, then we need to create or will fail.
670 * If we allow the two to race, we could end up with a file that is open
671 * but deleted on the server resulting in ESTALE.
672 * So use ->d_fsdata to record when the unlink is happening
673 * and block dentry revalidation while it is set.
674 */
675 #define NFS_FSDATA_BLOCKED ((void*)1)
676
677 # undef ifdebug
678 # ifdef NFS_DEBUG
679 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
680 # define NFS_IFDEBUG(x) x
681 # else
682 # define ifdebug(fac) if (0)
683 # define NFS_IFDEBUG(x)
684 # endif
685 #endif
686