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 nfs_file_localio {
81 struct nfsd_file __rcu *ro_file;
82 struct nfsd_file __rcu *rw_file;
83 struct list_head list;
84 void __rcu *nfs_uuid; /* opaque pointer to 'nfs_uuid_t' */
85 };
86
nfs_localio_file_init(struct nfs_file_localio * nfl)87 static inline void nfs_localio_file_init(struct nfs_file_localio *nfl)
88 {
89 #if IS_ENABLED(CONFIG_NFS_LOCALIO)
90 nfl->ro_file = NULL;
91 nfl->rw_file = NULL;
92 INIT_LIST_HEAD(&nfl->list);
93 nfl->nfs_uuid = NULL;
94 #endif
95 }
96
97 struct nfs4_state;
98 struct nfs_open_context {
99 struct nfs_lock_context lock_context;
100 fl_owner_t flock_owner;
101 struct dentry *dentry;
102 const struct cred *cred;
103 struct rpc_cred __rcu *ll_cred; /* low-level cred - use to check for expiry */
104 struct nfs4_state *state;
105 fmode_t mode;
106
107 int error;
108 unsigned long flags;
109 #define NFS_CONTEXT_BAD (2)
110 #define NFS_CONTEXT_UNLOCK (3)
111 #define NFS_CONTEXT_FILE_OPEN (4)
112
113 struct nfs4_threshold *mdsthreshold;
114 struct list_head list;
115 struct rcu_head rcu_head;
116 struct nfs_file_localio nfl;
117 };
118
119 struct nfs_open_dir_context {
120 struct list_head list;
121 atomic_t cache_hits;
122 atomic_t cache_misses;
123 unsigned long attr_gencount;
124 __be32 verf[NFS_DIR_VERIFIER_SIZE];
125 __u64 dir_cookie;
126 __u64 last_cookie;
127 pgoff_t page_index;
128 unsigned int dtsize;
129 bool force_clear;
130 bool eof;
131 struct rcu_head rcu_head;
132 };
133
134 /*
135 * NFSv4 delegation
136 */
137 struct nfs_delegation;
138
139 struct posix_acl;
140
141 struct nfs4_xattr_cache;
142
143 /*
144 * nfs fs inode data in memory
145 */
146 struct nfs_inode {
147 /*
148 * The 64bit 'inode number'
149 */
150 __u64 fileid;
151
152 /*
153 * NFS file handle
154 */
155 struct nfs_fh fh;
156
157 /*
158 * Various flags
159 */
160 unsigned long flags; /* atomic bit ops */
161 unsigned long cache_validity; /* bit mask */
162
163 /*
164 * NFS Attributes not included in struct inode
165 */
166
167 struct timespec64 btime;
168
169 /*
170 * read_cache_jiffies is when we started read-caching this inode.
171 * attrtimeo is for how long the cached information is assumed
172 * to be valid. A successful attribute revalidation doubles
173 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
174 * acregmin/acdirmin.
175 *
176 * We need to revalidate the cached attrs for this inode if
177 *
178 * jiffies - read_cache_jiffies >= attrtimeo
179 *
180 * Please note the comparison is greater than or equal
181 * so that zero timeout values can be specified.
182 */
183 unsigned long read_cache_jiffies;
184 unsigned long attrtimeo;
185 unsigned long attrtimeo_timestamp;
186
187 unsigned long attr_gencount;
188
189 struct rb_root access_cache;
190 struct list_head access_cache_entry_lru;
191 struct list_head access_cache_inode_lru;
192
193 union {
194 /* Directory */
195 struct {
196 /* "Generation counter" for the attribute cache.
197 * This is bumped whenever we update the metadata
198 * on the server.
199 */
200 unsigned long cache_change_attribute;
201 /*
202 * This is the cookie verifier used for NFSv3 readdir
203 * operations
204 */
205 __be32 cookieverf[NFS_DIR_VERIFIER_SIZE];
206 /* Readers: in-flight sillydelete RPC calls */
207 /* Writers: rmdir */
208 struct rw_semaphore rmdir_sem;
209 };
210 /* Regular file */
211 struct {
212 atomic_long_t nrequests;
213 atomic_long_t redirtied_pages;
214 struct nfs_mds_commit_info commit_info;
215 struct mutex commit_mutex;
216 };
217 };
218
219 /* Open contexts for shared mmap writes */
220 struct list_head open_files;
221
222 /* Keep track of out-of-order replies.
223 * The ooo array contains start/end pairs of
224 * numbers from the changeid sequence when
225 * the inode's iversion has been updated.
226 * It also contains end/start pair (i.e. reverse order)
227 * of sections of the changeid sequence that have
228 * been seen in replies from the server.
229 * Normally these should match and when both
230 * A:B and B:A are found in ooo, they are both removed.
231 * And if a reply with A:B causes an iversion update
232 * of A:B, then neither are added.
233 * When a reply has pre_change that doesn't match
234 * iversion, then the changeid pair and any consequent
235 * change in iversion ARE added. Later replies
236 * might fill in the gaps, or possibly a gap is caused
237 * by a change from another client.
238 * When a file or directory is opened, if the ooo table
239 * is not empty, then we assume the gaps were due to
240 * another client and we invalidate the cached data.
241 *
242 * We can only track a limited number of concurrent gaps.
243 * Currently that limit is 16.
244 * We allocate the table on demand. If there is insufficient
245 * memory, then we probably cannot cache the file anyway
246 * so there is no loss.
247 */
248 struct {
249 int cnt;
250 struct {
251 u64 start, end;
252 } gap[16];
253 } *ooo;
254
255 #if IS_ENABLED(CONFIG_NFS_V4)
256 struct nfs4_cached_acl *nfs4_acl;
257 /* NFSv4 state */
258 struct list_head open_states;
259 struct nfs_delegation __rcu *delegation;
260 struct rw_semaphore rwsem;
261
262 /* pNFS layout information */
263 struct pnfs_layout_hdr *layout;
264 #endif /* CONFIG_NFS_V4*/
265 /* how many bytes have been written/read and how many bytes queued up */
266 __u64 write_io;
267 __u64 read_io;
268 #ifdef CONFIG_NFS_V4_2
269 struct nfs4_xattr_cache *xattr_cache;
270 #endif
271 union {
272 struct inode vfs_inode;
273 #ifdef CONFIG_NFS_FSCACHE
274 struct netfs_inode netfs; /* netfs context and VFS inode */
275 #endif
276 };
277 };
278
279 struct nfs4_copy_state {
280 struct list_head copies;
281 struct list_head src_copies;
282 nfs4_stateid stateid;
283 struct completion completion;
284 uint64_t count;
285 struct nfs_writeverf verf;
286 int error;
287 int flags;
288 struct nfs4_state *parent_src_state;
289 struct nfs4_state *parent_dst_state;
290 };
291
292 /*
293 * Access bit flags
294 */
295 #define NFS_ACCESS_READ 0x0001
296 #define NFS_ACCESS_LOOKUP 0x0002
297 #define NFS_ACCESS_MODIFY 0x0004
298 #define NFS_ACCESS_EXTEND 0x0008
299 #define NFS_ACCESS_DELETE 0x0010
300 #define NFS_ACCESS_EXECUTE 0x0020
301 #define NFS_ACCESS_XAREAD 0x0040
302 #define NFS_ACCESS_XAWRITE 0x0080
303 #define NFS_ACCESS_XALIST 0x0100
304
305 /*
306 * Cache validity bit flags
307 */
308 #define NFS_INO_INVALID_DATA BIT(1) /* cached data is invalid */
309 #define NFS_INO_INVALID_ATIME BIT(2) /* cached atime is invalid */
310 #define NFS_INO_INVALID_ACCESS BIT(3) /* cached access cred invalid */
311 #define NFS_INO_INVALID_ACL BIT(4) /* cached acls are invalid */
312 #define NFS_INO_REVAL_FORCED BIT(6) /* force revalidation ignoring a delegation */
313 #define NFS_INO_INVALID_LABEL BIT(7) /* cached label is invalid */
314 #define NFS_INO_INVALID_CHANGE BIT(8) /* cached change is invalid */
315 #define NFS_INO_INVALID_CTIME BIT(9) /* cached ctime is invalid */
316 #define NFS_INO_INVALID_MTIME BIT(10) /* cached mtime is invalid */
317 #define NFS_INO_INVALID_SIZE BIT(11) /* cached size is invalid */
318 #define NFS_INO_INVALID_OTHER BIT(12) /* other attrs are invalid */
319 #define NFS_INO_DATA_INVAL_DEFER \
320 BIT(13) /* Deferred cache invalidation */
321 #define NFS_INO_INVALID_BLOCKS BIT(14) /* cached blocks are invalid */
322 #define NFS_INO_INVALID_XATTR BIT(15) /* xattrs are invalid */
323 #define NFS_INO_INVALID_NLINK BIT(16) /* cached nlinks is invalid */
324 #define NFS_INO_INVALID_MODE BIT(17) /* cached mode is invalid */
325 #define NFS_INO_INVALID_BTIME BIT(18) /* cached btime is invalid */
326
327 #define NFS_INO_INVALID_ATTR (NFS_INO_INVALID_CHANGE \
328 | NFS_INO_INVALID_CTIME \
329 | NFS_INO_INVALID_MTIME \
330 | NFS_INO_INVALID_BTIME \
331 | NFS_INO_INVALID_SIZE \
332 | NFS_INO_INVALID_NLINK \
333 | NFS_INO_INVALID_MODE \
334 | NFS_INO_INVALID_OTHER) /* inode metadata is invalid */
335
336 /*
337 * Bit offsets in flags field
338 */
339 #define NFS_INO_STALE (1) /* possible stale inode */
340 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
341 #define NFS_INO_INVALIDATING (3) /* inode is being invalidated */
342 #define NFS_INO_PRESERVE_UNLINKED (4) /* preserve file if removed while open */
343 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
344 #define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
345 #define NFS_INO_LAYOUTSTATS (11) /* layoutstats inflight */
346 #define NFS_INO_ODIRECT (12) /* I/O setting is O_DIRECT */
347
NFS_I(const struct inode * inode)348 static inline struct nfs_inode *NFS_I(const struct inode *inode)
349 {
350 return container_of(inode, struct nfs_inode, vfs_inode);
351 }
352
NFS_SB(const struct super_block * s)353 static inline struct nfs_server *NFS_SB(const struct super_block *s)
354 {
355 return (struct nfs_server *)(s->s_fs_info);
356 }
357
NFS_FH(const struct inode * inode)358 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
359 {
360 return &NFS_I(inode)->fh;
361 }
362
NFS_SERVER(const struct inode * inode)363 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
364 {
365 return NFS_SB(inode->i_sb);
366 }
367
NFS_CLIENT(const struct inode * inode)368 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
369 {
370 return NFS_SERVER(inode)->client;
371 }
372
NFS_PROTO(const struct inode * inode)373 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
374 {
375 return NFS_SERVER(inode)->nfs_client->rpc_ops;
376 }
377
NFS_MINATTRTIMEO(const struct inode * inode)378 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
379 {
380 struct nfs_server *nfss = NFS_SERVER(inode);
381 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
382 }
383
NFS_MAXATTRTIMEO(const struct inode * inode)384 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
385 {
386 struct nfs_server *nfss = NFS_SERVER(inode);
387 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
388 }
389
NFS_STALE(const struct inode * inode)390 static inline int NFS_STALE(const struct inode *inode)
391 {
392 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
393 }
394
NFS_FILEID(const struct inode * inode)395 static inline __u64 NFS_FILEID(const struct inode *inode)
396 {
397 return NFS_I(inode)->fileid;
398 }
399
set_nfs_fileid(struct inode * inode,__u64 fileid)400 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
401 {
402 NFS_I(inode)->fileid = fileid;
403 }
404
nfs_mark_for_revalidate(struct inode * inode)405 static inline void nfs_mark_for_revalidate(struct inode *inode)
406 {
407 struct nfs_inode *nfsi = NFS_I(inode);
408
409 spin_lock(&inode->i_lock);
410 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
411 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
412 NFS_INO_INVALID_SIZE;
413 if (S_ISDIR(inode->i_mode))
414 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
415 spin_unlock(&inode->i_lock);
416 }
417
nfs_server_capable(const struct inode * inode,int cap)418 static inline int nfs_server_capable(const struct inode *inode, int cap)
419 {
420 return NFS_SERVER(inode)->caps & cap;
421 }
422
423 /**
424 * nfs_save_change_attribute - Returns the inode attribute change cookie
425 * @dir - pointer to parent directory inode
426 * The "cache change attribute" is updated when we need to revalidate
427 * our dentry cache after a directory was seen to change on the server.
428 */
nfs_save_change_attribute(struct inode * dir)429 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
430 {
431 return NFS_I(dir)->cache_change_attribute;
432 }
433
434 /*
435 * linux/fs/nfs/inode.c
436 */
437 extern int nfs_sync_mapping(struct address_space *mapping);
438 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
439 extern void nfs_zap_caches(struct inode *);
440 extern void nfs_set_inode_stale(struct inode *inode);
441 extern void nfs_invalidate_atime(struct inode *);
442 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
443 struct nfs_fattr *);
444 struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
445 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
446 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
447 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
448 extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
449 extern int nfs_getattr(struct mnt_idmap *, const struct path *,
450 struct kstat *, u32, unsigned int);
451 extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *, const struct cred *);
452 extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
453 extern int nfs_permission(struct mnt_idmap *, struct inode *, int);
454 extern int nfs_open(struct inode *, struct file *);
455 extern int nfs_attribute_cache_expired(struct inode *inode);
456 extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);
457 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
458 extern int nfs_clear_invalid_mapping(struct address_space *mapping);
459 extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
460 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
461 extern int nfs_revalidate_mapping_rcu(struct inode *inode);
462 extern int nfs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *);
463 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
464 extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr);
465 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
466 extern void put_nfs_open_context(struct nfs_open_context *ctx);
467 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
468 extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
469 extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
470 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
471 extern void nfs_file_clear_open_context(struct file *flip);
472 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
473 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
474 extern u64 nfs_compat_user_ino64(u64 fileid);
475 extern void nfs_fattr_init(struct nfs_fattr *fattr);
476 extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
477 extern unsigned long nfs_inc_attr_generation_counter(void);
478
479 extern struct nfs_fattr *nfs_alloc_fattr(void);
480 extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server);
481
nfs4_label_free(struct nfs4_label * label)482 static inline void nfs4_label_free(struct nfs4_label *label)
483 {
484 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
485 if (label) {
486 kfree(label->label);
487 kfree(label);
488 }
489 #endif
490 }
491
nfs_free_fattr(const struct nfs_fattr * fattr)492 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
493 {
494 if (fattr)
495 nfs4_label_free(fattr->label);
496 kfree(fattr);
497 }
498
499 extern struct nfs_fh *nfs_alloc_fhandle(void);
500
nfs_free_fhandle(const struct nfs_fh * fh)501 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
502 {
503 kfree(fh);
504 }
505
506 #ifdef NFS_DEBUG
507 extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
nfs_display_fhandle_hash(const struct nfs_fh * fh)508 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
509 {
510 return _nfs_display_fhandle_hash(fh);
511 }
512 extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
513 #define nfs_display_fhandle(fh, caption) \
514 do { \
515 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
516 _nfs_display_fhandle(fh, caption); \
517 } while (0)
518 #else
nfs_display_fhandle_hash(const struct nfs_fh * fh)519 static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
520 {
521 return 0;
522 }
nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)523 static inline void nfs_display_fhandle(const struct nfs_fh *fh,
524 const char *caption)
525 {
526 }
527 #endif
528
529 /*
530 * linux/fs/nfs/nfsroot.c
531 */
532 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
533 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
534 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
535
536 /*
537 * linux/fs/nfs/file.c
538 */
539 extern const struct file_operations nfs_file_operations;
540 #if IS_ENABLED(CONFIG_NFS_V4)
541 extern const struct file_operations nfs4_file_operations;
542 #endif /* CONFIG_NFS_V4 */
543 extern const struct address_space_operations nfs_file_aops;
544 extern const struct address_space_operations nfs_dir_aops;
545
nfs_file_open_context(struct file * filp)546 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
547 {
548 return filp->private_data;
549 }
550
nfs_file_cred(struct file * file)551 static inline const struct cred *nfs_file_cred(struct file *file)
552 {
553 if (file != NULL) {
554 struct nfs_open_context *ctx =
555 nfs_file_open_context(file);
556 if (ctx)
557 return ctx->cred;
558 }
559 return NULL;
560 }
561
562 /*
563 * linux/fs/nfs/direct.c
564 */
565 int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter);
566 ssize_t nfs_file_direct_read(struct kiocb *iocb,
567 struct iov_iter *iter, bool swap);
568 ssize_t nfs_file_direct_write(struct kiocb *iocb,
569 struct iov_iter *iter, bool swap);
570
571 /*
572 * linux/fs/nfs/dir.c
573 */
574 extern const struct file_operations nfs_dir_operations;
575 extern const struct dentry_operations nfs_dentry_operations;
576
577 extern void nfs_force_lookup_revalidate(struct inode *dir);
578 extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);
579 #if IS_ENABLED(CONFIG_NFS_V4)
580 extern void nfs_clear_verifier_delegated(struct inode *inode);
581 #endif /* IS_ENABLED(CONFIG_NFS_V4) */
582 extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
583 struct nfs_fh *fh, struct nfs_fattr *fattr);
584 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
585 struct nfs_fattr *fattr);
586 extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
587 extern void nfs_access_zap_cache(struct inode *inode);
588 extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred,
589 u32 *mask, bool may_block);
590 extern int nfs_atomic_open_v23(struct inode *dir, struct dentry *dentry,
591 struct file *file, unsigned int open_flags,
592 umode_t mode);
593
594 /*
595 * linux/fs/nfs/symlink.c
596 */
597 extern const struct inode_operations nfs_symlink_inode_operations;
598
599 /*
600 * linux/fs/nfs/sysctl.c
601 */
602 #ifdef CONFIG_SYSCTL
603 extern int nfs_register_sysctl(void);
604 extern void nfs_unregister_sysctl(void);
605 #else
606 #define nfs_register_sysctl() 0
607 #define nfs_unregister_sysctl() do { } while(0)
608 #endif
609
610 /*
611 * linux/fs/nfs/namespace.c
612 */
613 extern const struct inode_operations nfs_mountpoint_inode_operations;
614 extern const struct inode_operations nfs_referral_inode_operations;
615 extern int nfs_mountpoint_expiry_timeout;
616 extern void nfs_release_automount_timer(void);
617
618 /*
619 * linux/fs/nfs/unlink.c
620 */
621 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
622
623 /*
624 * linux/fs/nfs/write.c
625 */
626 extern int nfs_congestion_kb;
627 extern int nfs_writepages(struct address_space *, struct writeback_control *);
628 extern int nfs_flush_incompatible(struct file *file, struct folio *folio);
629 extern int nfs_update_folio(struct file *file, struct folio *folio,
630 unsigned int offset, unsigned int count);
631
632 /*
633 * Try to write back everything synchronously (but check the
634 * return value!)
635 */
636 extern int nfs_sync_inode(struct inode *inode);
637 extern int nfs_wb_all(struct inode *inode);
638 extern int nfs_wb_folio(struct inode *inode, struct folio *folio);
639 int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio);
640 extern int nfs_commit_inode(struct inode *, int);
641 extern struct nfs_commit_data *nfs_commitdata_alloc(void);
642 extern void nfs_commit_free(struct nfs_commit_data *data);
643 void nfs_commit_begin(struct nfs_mds_commit_info *cinfo);
644 bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
645
nfs_have_writebacks(const struct inode * inode)646 static inline bool nfs_have_writebacks(const struct inode *inode)
647 {
648 if (S_ISREG(inode->i_mode))
649 return atomic_long_read(&NFS_I(inode)->nrequests) != 0;
650 return false;
651 }
652
653 /*
654 * linux/fs/nfs/read.c
655 */
656 int nfs_read_folio(struct file *, struct folio *);
657 void nfs_readahead(struct readahead_control *);
658
659 /*
660 * inline functions
661 */
662
nfs_size_to_loff_t(__u64 size)663 static inline loff_t nfs_size_to_loff_t(__u64 size)
664 {
665 return min_t(u64, size, OFFSET_MAX);
666 }
667
668 static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)669 nfs_fileid_to_ino_t(u64 fileid)
670 {
671 ino_t ino = (ino_t) fileid;
672 if (sizeof(ino_t) < sizeof(u64))
673 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
674 return ino;
675 }
676
nfs_ooo_clear(struct nfs_inode * nfsi)677 static inline void nfs_ooo_clear(struct nfs_inode *nfsi)
678 {
679 nfsi->cache_validity &= ~NFS_INO_DATA_INVAL_DEFER;
680 kfree(nfsi->ooo);
681 nfsi->ooo = NULL;
682 }
683
nfs_ooo_test(struct nfs_inode * nfsi)684 static inline bool nfs_ooo_test(struct nfs_inode *nfsi)
685 {
686 return (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) ||
687 (nfsi->ooo && nfsi->ooo->cnt > 0);
688
689 }
690
691 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
692
693 /* We need to block new opens while a file is being unlinked.
694 * If it is opened *before* we decide to unlink, we will silly-rename
695 * instead. If it is opened *after*, then we need to create or will fail.
696 * If we allow the two to race, we could end up with a file that is open
697 * but deleted on the server resulting in ESTALE.
698 * So use ->d_fsdata to record when the unlink is happening
699 * and block dentry revalidation while it is set.
700 */
701 #define NFS_FSDATA_BLOCKED ((void*)1)
702
703 # undef ifdebug
704 # ifdef NFS_DEBUG
705 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
706 # define NFS_IFDEBUG(x) x
707 # else
708 # define ifdebug(fac) if (0)
709 # define NFS_IFDEBUG(x)
710 # endif
711 #endif
712