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 */
60struct 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
71struct 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
80struct 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
87static 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(list: &nfl->list);
93 nfl->nfs_uuid = NULL;
94#endif
95}
96
97struct nfs4_state;
98struct 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
119struct 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 */
137struct nfs_delegation;
138
139struct posix_acl;
140
141struct nfs4_xattr_cache;
142
143/*
144 * nfs fs inode data in memory
145 */
146struct 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
279struct 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#define NFS_INO_REQ_DIR_DELEG (13) /* Request a directory delegation */
348
349static inline struct nfs_inode *NFS_I(const struct inode *inode)
350{
351 return container_of(inode, struct nfs_inode, vfs_inode);
352}
353
354static inline struct nfs_server *NFS_SB(const struct super_block *s)
355{
356 return (struct nfs_server *)(s->s_fs_info);
357}
358
359static inline struct nfs_fh *NFS_FH(const struct inode *inode)
360{
361 return &NFS_I(inode)->fh;
362}
363
364static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
365{
366 return NFS_SB(s: inode->i_sb);
367}
368
369static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
370{
371 return NFS_SERVER(inode)->client;
372}
373
374static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
375{
376 return NFS_SERVER(inode)->nfs_client->rpc_ops;
377}
378
379static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
380{
381 struct nfs_server *nfss = NFS_SERVER(inode);
382 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
383}
384
385static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
386{
387 struct nfs_server *nfss = NFS_SERVER(inode);
388 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
389}
390
391static inline int NFS_STALE(const struct inode *inode)
392{
393 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
394}
395
396static inline __u64 NFS_FILEID(const struct inode *inode)
397{
398 return NFS_I(inode)->fileid;
399}
400
401static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
402{
403 NFS_I(inode)->fileid = fileid;
404}
405
406static inline void nfs_mark_for_revalidate(struct inode *inode)
407{
408 struct nfs_inode *nfsi = NFS_I(inode);
409
410 spin_lock(lock: &inode->i_lock);
411 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
412 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
413 NFS_INO_INVALID_SIZE;
414 if (S_ISDIR(inode->i_mode))
415 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
416 spin_unlock(lock: &inode->i_lock);
417}
418
419static inline int nfs_server_capable(const struct inode *inode, int cap)
420{
421 return NFS_SERVER(inode)->caps & cap;
422}
423
424/**
425 * nfs_save_change_attribute - Returns the inode attribute change cookie
426 * @dir - pointer to parent directory inode
427 * The "cache change attribute" is updated when we need to revalidate
428 * our dentry cache after a directory was seen to change on the server.
429 */
430static inline unsigned long nfs_save_change_attribute(struct inode *dir)
431{
432 return NFS_I(inode: dir)->cache_change_attribute;
433}
434
435/*
436 * linux/fs/nfs/inode.c
437 */
438extern int nfs_sync_mapping(struct address_space *mapping);
439extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
440extern void nfs_zap_caches(struct inode *);
441extern void nfs_set_inode_stale(struct inode *inode);
442extern void nfs_invalidate_atime(struct inode *);
443extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
444 struct nfs_fattr *);
445struct inode *nfs_ilookup(struct super_block *sb, struct nfs_fattr *, struct nfs_fh *);
446extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
447extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
448extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
449extern int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr);
450extern int nfs_getattr(struct mnt_idmap *, const struct path *,
451 struct kstat *, u32, unsigned int);
452extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *, const struct cred *);
453extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
454extern int nfs_permission(struct mnt_idmap *, struct inode *, int);
455extern int nfs_open(struct inode *, struct file *);
456extern int nfs_attribute_cache_expired(struct inode *inode);
457extern int nfs_revalidate_inode(struct inode *inode, unsigned long flags);
458extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
459extern int nfs_clear_invalid_mapping(struct address_space *mapping);
460extern bool nfs_mapping_need_revalidate_inode(struct inode *inode);
461extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
462extern int nfs_revalidate_mapping_rcu(struct inode *inode);
463extern int nfs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *);
464extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, struct nfs_fattr *);
465extern void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr);
466extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
467extern void put_nfs_open_context(struct nfs_open_context *ctx);
468extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode);
469extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode, struct file *filp);
470extern void nfs_inode_attach_open_context(struct nfs_open_context *ctx);
471extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
472extern void nfs_file_clear_open_context(struct file *flip);
473extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
474extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
475extern u64 nfs_compat_user_ino64(u64 fileid);
476extern void nfs_fattr_init(struct nfs_fattr *fattr);
477extern void nfs_fattr_set_barrier(struct nfs_fattr *fattr);
478extern unsigned long nfs_inc_attr_generation_counter(void);
479
480extern struct nfs_fattr *nfs_alloc_fattr(void);
481extern struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server);
482
483static inline void nfs4_label_free(struct nfs4_label *label)
484{
485#ifdef CONFIG_NFS_V4_SECURITY_LABEL
486 if (label) {
487 kfree(objp: label->label);
488 kfree(objp: label);
489 }
490#endif
491}
492
493static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
494{
495 if (fattr)
496 nfs4_label_free(label: fattr->label);
497 kfree(objp: fattr);
498}
499
500extern struct nfs_fh *nfs_alloc_fhandle(void);
501
502static inline void nfs_free_fhandle(const struct nfs_fh *fh)
503{
504 kfree(objp: fh);
505}
506
507#ifdef NFS_DEBUG
508extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
509static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
510{
511 return _nfs_display_fhandle_hash(fh);
512}
513extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
514#define nfs_display_fhandle(fh, caption) \
515 do { \
516 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
517 _nfs_display_fhandle(fh, caption); \
518 } while (0)
519#else
520static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
521{
522 return 0;
523}
524static inline void nfs_display_fhandle(const struct nfs_fh *fh,
525 const char *caption)
526{
527}
528#endif
529
530/*
531 * linux/fs/nfs/nfsroot.c
532 */
533extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
534/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
535extern __be32 root_nfs_parse_addr(char *name); /*__init*/
536
537/*
538 * linux/fs/nfs/file.c
539 */
540extern const struct file_operations nfs_file_operations;
541#if IS_ENABLED(CONFIG_NFS_V4)
542extern const struct file_operations nfs4_file_operations;
543#endif /* CONFIG_NFS_V4 */
544extern const struct address_space_operations nfs_file_aops;
545extern const struct address_space_operations nfs_dir_aops;
546
547static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
548{
549 return filp->private_data;
550}
551
552static inline const struct cred *nfs_file_cred(struct file *file)
553{
554 if (file != NULL) {
555 struct nfs_open_context *ctx =
556 nfs_file_open_context(filp: file);
557 if (ctx)
558 return ctx->cred;
559 }
560 return NULL;
561}
562
563/*
564 * linux/fs/nfs/direct.c
565 */
566int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter);
567ssize_t nfs_file_direct_read(struct kiocb *iocb,
568 struct iov_iter *iter, bool swap);
569ssize_t nfs_file_direct_write(struct kiocb *iocb,
570 struct iov_iter *iter, bool swap);
571
572/*
573 * linux/fs/nfs/dir.c
574 */
575extern const struct file_operations nfs_dir_operations;
576extern const struct dentry_operations nfs_dentry_operations;
577
578extern void nfs_force_lookup_revalidate(struct inode *dir);
579extern void nfs_set_verifier(struct dentry * dentry, unsigned long verf);
580#if IS_ENABLED(CONFIG_NFS_V4)
581extern void nfs_clear_verifier_delegated(struct inode *inode);
582#endif /* IS_ENABLED(CONFIG_NFS_V4) */
583extern struct dentry *nfs_add_or_obtain(struct dentry *dentry,
584 struct nfs_fh *fh, struct nfs_fattr *fattr);
585extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh,
586 struct nfs_fattr *fattr);
587extern int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags);
588extern void nfs_access_zap_cache(struct inode *inode);
589extern int nfs_access_get_cached(struct inode *inode, const struct cred *cred,
590 u32 *mask, bool may_block);
591extern int nfs_atomic_open_v23(struct inode *dir, struct dentry *dentry,
592 struct file *file, unsigned int open_flags,
593 umode_t mode);
594
595/*
596 * linux/fs/nfs/symlink.c
597 */
598extern const struct inode_operations nfs_symlink_inode_operations;
599
600/*
601 * linux/fs/nfs/sysctl.c
602 */
603#ifdef CONFIG_SYSCTL
604extern int nfs_register_sysctl(void);
605extern void nfs_unregister_sysctl(void);
606#else
607#define nfs_register_sysctl() 0
608#define nfs_unregister_sysctl() do { } while(0)
609#endif
610
611/*
612 * linux/fs/nfs/namespace.c
613 */
614extern const struct inode_operations nfs_mountpoint_inode_operations;
615extern const struct inode_operations nfs_referral_inode_operations;
616extern int nfs_mountpoint_expiry_timeout;
617extern void nfs_release_automount_timer(void);
618
619/*
620 * linux/fs/nfs/unlink.c
621 */
622extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
623
624/*
625 * linux/fs/nfs/write.c
626 */
627extern int nfs_congestion_kb;
628extern int nfs_writepages(struct address_space *, struct writeback_control *);
629extern int nfs_flush_incompatible(struct file *file, struct folio *folio);
630extern int nfs_update_folio(struct file *file, struct folio *folio,
631 unsigned int offset, unsigned int count);
632
633/*
634 * Try to write back everything synchronously (but check the
635 * return value!)
636 */
637extern int nfs_sync_inode(struct inode *inode);
638extern int nfs_wb_all(struct inode *inode);
639extern int nfs_wb_folio(struct inode *inode, struct folio *folio);
640extern int nfs_wb_folio_reclaim(struct inode *inode, struct folio *folio);
641int nfs_wb_folio_cancel(struct inode *inode, struct folio *folio);
642extern int nfs_commit_inode(struct inode *, int);
643extern struct nfs_commit_data *nfs_commitdata_alloc(void);
644extern void nfs_commit_free(struct nfs_commit_data *data);
645void nfs_commit_begin(struct nfs_mds_commit_info *cinfo);
646bool nfs_commit_end(struct nfs_mds_commit_info *cinfo);
647
648static inline bool nfs_have_writebacks(const struct inode *inode)
649{
650 if (S_ISREG(inode->i_mode))
651 return atomic_long_read(v: &NFS_I(inode)->nrequests) != 0;
652 return false;
653}
654
655/*
656 * linux/fs/nfs/read.c
657 */
658int nfs_read_folio(struct file *, struct folio *);
659void nfs_readahead(struct readahead_control *);
660
661/*
662 * inline functions
663 */
664
665static inline loff_t nfs_size_to_loff_t(__u64 size)
666{
667 return min_t(u64, size, OFFSET_MAX);
668}
669
670static inline ino_t
671nfs_fileid_to_ino_t(u64 fileid)
672{
673 ino_t ino = (ino_t) fileid;
674 if (sizeof(ino_t) < sizeof(u64))
675 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
676 return ino;
677}
678
679static inline void nfs_ooo_clear(struct nfs_inode *nfsi)
680{
681 nfsi->cache_validity &= ~NFS_INO_DATA_INVAL_DEFER;
682 kfree(objp: nfsi->ooo);
683 nfsi->ooo = NULL;
684}
685
686static inline bool nfs_ooo_test(struct nfs_inode *nfsi)
687{
688 return (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) ||
689 (nfsi->ooo && nfsi->ooo->cnt > 0);
690
691}
692
693#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
694
695/* We need to block new opens while a file is being unlinked.
696 * If it is opened *before* we decide to unlink, we will silly-rename
697 * instead. If it is opened *after*, then we need to create or will fail.
698 * If we allow the two to race, we could end up with a file that is open
699 * but deleted on the server resulting in ESTALE.
700 * So use ->d_fsdata to record when the unlink is happening
701 * and block dentry revalidation while it is set.
702 */
703#define NFS_FSDATA_BLOCKED ((void*)1)
704
705# undef ifdebug
706# ifdef NFS_DEBUG
707# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
708# define NFS_IFDEBUG(x) x
709# else
710# define ifdebug(fac) if (0)
711# define NFS_IFDEBUG(x)
712# endif
713#endif
714

source code of linux/include/linux/nfs_fs.h