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[mirror_ubuntu-bionic-kernel.git] / include / linux / nfs_fs.h
CommitLineData
1da177e4
LT		 1/*
2 * linux/include/linux/nfs_fs.h
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * OS-specific nfs filesystem definitions and declarations
7 */
8
9#ifndef _LINUX_NFS_FS_H
10#define _LINUX_NFS_FS_H
11
e18fa700
JG		 12#include <linux/magic.h>
13
03bf4b70 14/* Default timeout values */
259875ef
TM		 15#define NFS_DEF_UDP_TIMEO (11)
16#define NFS_DEF_UDP_RETRANS (3)
17#define NFS_DEF_TCP_TIMEO (600)
18#define NFS_DEF_TCP_RETRANS (2)
19
03bf4b70
CL		 20#define NFS_MAX_UDP_TIMEOUT (60*HZ)
21#define NFS_MAX_TCP_TIMEOUT (600*HZ)
22
0e0cab74
CL		 23#define NFS_DEF_ACREGMIN (3)
24#define NFS_DEF_ACREGMAX (60)
25#define NFS_DEF_ACDIRMIN (30)
26#define NFS_DEF_ACDIRMAX (60)
27
1da177e4
LT		 28/*
29 * When flushing a cluster of dirty pages, there can be different
30 * strategies:
31 */
1da177e4 32#define FLUSH_SYNC 1 /* file being synced, or contention */
1da177e4
LT		 33#define FLUSH_STABLE 4 /* commit to stable storage */
34#define FLUSH_LOWPRI 8 /* low priority background flush */
35#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
b31268ac
TM		 36#define FLUSH_COND_STABLE 32 /* conditional stable write - only stable
37 * if everything fits in one RPC */
1da177e4
LT		 38
39#ifdef __KERNEL__
40
e27d359e
TM		 41/*
42 * Enable dprintk() debugging support for nfs client.
43 */
44#ifdef CONFIG_NFS_DEBUG
45# define NFS_DEBUG
46#endif
47
7f1cbe51
DW		 48#include <linux/in.h>
49#include <linux/mm.h>
50#include <linux/pagemap.h>
1c3c07e9 51#include <linux/rbtree.h>
7f1cbe51
DW		 52#include <linux/rwsem.h>
53#include <linux/wait.h>
54
55#include <linux/sunrpc/debug.h>
56#include <linux/sunrpc/auth.h>
57#include <linux/sunrpc/clnt.h>
58
59#include <linux/nfs.h>
60#include <linux/nfs2.h>
61#include <linux/nfs3.h>
62#include <linux/nfs4.h>
63#include <linux/nfs_xdr.h>
7f1cbe51
DW		 64#include <linux/nfs_fs_sb.h>
65
7f1cbe51
DW		 66#include <linux/mempool.h>
67
68/*
69 * These are the default flags for swap requests
70 */
71#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
72
1da177e4
LT		 73/*
74 * NFSv3/v4 Access mode cache entry
75 */
76struct nfs_access_entry {
1c3c07e9 77 struct rb_node rb_node;
cfcea3e8 78 struct list_head lru;
1da177e4
LT		 79 unsigned long jiffies;
80 struct rpc_cred * cred;
81 int mask;
82};
83
2a369153
TM		 84struct nfs_lockowner {
85 fl_owner_t l_owner;
86 pid_t l_pid;
87};
88
f11ac8db
TM		 89struct nfs_lock_context {
90 atomic_t count;
91 struct list_head list;
92 struct nfs_open_context *open_context;
2a369153 93 struct nfs_lockowner lockowner;
f11ac8db
TM		 94};
95
1da177e4
LT		 96struct nfs4_state;
97struct nfs_open_context {
f11ac8db 98 struct nfs_lock_context lock_context;
3d4ff43d 99 struct dentry *dentry;
1da177e4
LT		 100 struct rpc_cred *cred;
101 struct nfs4_state *state;
dc0b027d 102 fmode_t mode;
7b159fc1
TM		 103
104 unsigned long flags;
105#define NFS_CONTEXT_ERROR_WRITE (0)
05990d1b 106#define NFS_CONTEXT_RESEND_WRITES (1)
1da177e4
LT		 107 int error;
108
109 struct list_head list;
82be417a 110 struct nfs4_threshold *mdsthreshold;
480c2006 111};
00a92642 112
480c2006
BS		 113struct nfs_open_dir_context {
114 struct rpc_cred *cred;
0c030806 115 unsigned long attr_gencount;
00a92642 116 __u64 dir_cookie;
8ef2ce3e 117 __u64 dup_cookie;
0c030806 118 signed char duped;
1da177e4
LT		 119};
120
121/*
122 * NFSv4 delegation
123 */
124struct nfs_delegation;
125
5c6a9f7d
AG		 126struct posix_acl;
127
1da177e4
LT		 128/*
129 * nfs fs inode data in memory
130 */
131struct nfs_inode {
132 /*
133 * The 64bit 'inode number'
134 */
135 __u64 fileid;
136
137 /*
138 * NFS file handle
139 */
140 struct nfs_fh fh;
141
142 /*
143 * Various flags
144 */
412d582e
CL		 145 unsigned long flags; /* atomic bit ops */
146 unsigned long cache_validity; /* bit mask */
1da177e4
LT		 147
148 /*
24bd68f4 149 * read_cache_jiffies is when we started read-caching this inode.
1da177e4
LT		 150 * attrtimeo is for how long the cached information is assumed
151 * to be valid. A successful attribute revalidation doubles
152 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
153 * acregmin/acdirmin.
154 *
155 * We need to revalidate the cached attrs for this inode if
156 *
64672d55
PS		 157 * jiffies - read_cache_jiffies >= attrtimeo
158 *
159 * Please note the comparison is greater than or equal
160 * so that zero timeout values can be specified.
1da177e4 161 */
1da177e4
LT		 162 unsigned long read_cache_jiffies;
163 unsigned long attrtimeo;
164 unsigned long attrtimeo_timestamp;
1da177e4 165
4704f0e2 166 unsigned long attr_gencount;
1da177e4
LT		 167 /* "Generation counter" for the attribute cache. This is
168 * bumped whenever we update the metadata on the
169 * server.
170 */
171 unsigned long cache_change_attribute;
1da177e4 172
1c3c07e9 173 struct rb_root access_cache;
cfcea3e8
TM		 174 struct list_head access_cache_entry_lru;
175 struct list_head access_cache_inode_lru;
5c6a9f7d
AG		 176#ifdef CONFIG_NFS_V3_ACL
177 struct posix_acl *acl_access;
178 struct posix_acl *acl_default;
179#endif
1da177e4
LT		 180
181 /*
182 * This is the cookie verifier used for NFSv3 readdir
183 * operations
184 */
bc4785cd 185 __be32 cookieverf[2];
1da177e4 186
fb8a1f11 187 unsigned long npages;
ea2cf228 188 struct nfs_mds_commit_info commit_info;
1da177e4
LT		 189
190 /* Open contexts for shared mmap writes */
191 struct list_head open_files;
192
565277f6
TM		 193 /* Number of in-flight sillydelete RPC calls */
194 atomic_t silly_count;
195 /* List of deferred sillydelete requests */
196 struct hlist_head silly_list;
197 wait_queue_head_t waitqueue;
198
89d77c8f 199#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e 200 struct nfs4_cached_acl *nfs4_acl;
1da177e4
LT		 201 /* NFSv4 state */
202 struct list_head open_states;
5b22216e 203 struct nfs_delegation __rcu *delegation;
bd7bf9d5 204 fmode_t delegation_state;
1da177e4 205 struct rw_semaphore rwsem;
e5e94017
BH		 206
207 /* pNFS layout information */
208 struct pnfs_layout_hdr *layout;
1da177e4 209#endif /* CONFIG_NFS_V4*/
2701d086
AA		 210 /* how many bytes have been written/read and how many bytes queued up */
211 __u64 write_io;
212 __u64 read_io;
ef79c097
DH		 213#ifdef CONFIG_NFS_FSCACHE
214 struct fscache_cookie *fscache;
215#endif
1da177e4
LT		 216 struct inode vfs_inode;
217};
218
219/*
55296809 220 * Cache validity bit flags
1da177e4 221 */
55296809
CL		 222#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
223#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
224#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
225#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
226#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
227#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
412c77ce 228#define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
55296809
CL		 229
230/*
412d582e 231 * Bit offsets in flags field
55296809 232 */
691beb13
TM		 233#define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
234#define NFS_INO_STALE (1) /* possible stale inode */
235#define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
72cb77f4 236#define NFS_INO_FLUSHING (4) /* inode is flushing out data */
ef79c097
DH		 237#define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
238#define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
71d0a611 239#define NFS_INO_COMMIT (7) /* inode is committing unstable writes */
863a3c6c 240#define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
92407e75 241#define NFS_INO_LAYOUTCOMMITTING (10) /* layoutcommit inflight */
1da177e4 242
99fadcd7 243static inline struct nfs_inode *NFS_I(const struct inode *inode)
1da177e4
LT		 244{
245 return container_of(inode, struct nfs_inode, vfs_inode);
246}
99fadcd7
BH		 247
248static inline struct nfs_server *NFS_SB(const struct super_block *s)
249{
250 return (struct nfs_server *)(s->s_fs_info);
251}
252
253static inline struct nfs_fh *NFS_FH(const struct inode *inode)
254{
255 return &NFS_I(inode)->fh;
256}
257
258static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
259{
260 return NFS_SB(inode->i_sb);
261}
262
263static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
264{
265 return NFS_SERVER(inode)->client;
266}
267
268static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
269{
270 return NFS_SERVER(inode)->nfs_client->rpc_ops;
271}
272
99fadcd7
BH		 273static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
274{
275 struct nfs_server *nfss = NFS_SERVER(inode);
276 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
277}
278
279static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
280{
281 struct nfs_server *nfss = NFS_SERVER(inode);
282 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
283}
284
285static inline int NFS_STALE(const struct inode *inode)
286{
287 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
288}
289
ef79c097
DH		 290static inline int NFS_FSCACHE(const struct inode *inode)
291{
292 return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
293}
294
99fadcd7
BH		 295static inline __u64 NFS_FILEID(const struct inode *inode)
296{
297 return NFS_I(inode)->fileid;
298}
299
300static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
301{
302 NFS_I(inode)->fileid = fileid;
303}
1da177e4 304
decf491f
TM		 305static inline void nfs_mark_for_revalidate(struct inode *inode)
306{
38478b24
TM		 307 struct nfs_inode *nfsi = NFS_I(inode);
308
decf491f 309 spin_lock(&inode->i_lock);
38478b24 310 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
f3821110 311 if (S_ISDIR(inode->i_mode))
38478b24 312 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
decf491f
TM		 313 spin_unlock(&inode->i_lock);
314}
315
1da177e4
LT		 316static inline int nfs_server_capable(struct inode *inode, int cap)
317{
318 return NFS_SERVER(inode)->caps & cap;
319}
320
d75340cc
TM		 321static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
322{
323 dentry->d_time = verf;
324}
325
1da177e4
LT		 326/**
327 * nfs_save_change_attribute - Returns the inode attribute change cookie
8edb0182 328 * @dir - pointer to parent directory inode
1da177e4
LT		 329 * The "change attribute" is updated every time we finish an operation
330 * that will result in a metadata change on the server.
331 */
8edb0182 332static inline unsigned long nfs_save_change_attribute(struct inode *dir)
1da177e4 333{
8edb0182 334 return NFS_I(dir)->cache_change_attribute;
1da177e4
LT		 335}
336
337/**
4b841736
TM		 338 * nfs_verify_change_attribute - Detects NFS remote directory changes
339 * @dir - pointer to parent directory inode
1da177e4 340 * @chattr - previously saved change attribute
4b841736
TM		 341 * Return "false" if the verifiers doesn't match the change attribute.
342 * This would usually indicate that the directory contents have changed on
343 * the server, and that any dentries need revalidating.
1da177e4 344 */
4b841736 345static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
1da177e4 346{
4b841736 347 return chattr == NFS_I(dir)->cache_change_attribute;
1da177e4
LT		 348}
349
350/*
351 * linux/fs/nfs/inode.c
352 */
29884df0 353extern int nfs_sync_mapping(struct address_space *mapping);
cd9ae2b6 354extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
1da177e4 355extern void nfs_zap_caches(struct inode *);
c4812998 356extern void nfs_invalidate_atime(struct inode *);
1da177e4
LT		 357extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
358 struct nfs_fattr *);
359extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
decf491f 360extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
70ca8852 361extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
1da177e4 362extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
6168f62c
WAA		 363extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
364extern void nfs_access_set_mask(struct nfs_access_entry *, u32);
10556cb2 365extern int nfs_permission(struct inode *, int);
1da177e4
LT		 366extern int nfs_open(struct inode *, struct file *);
367extern int nfs_release(struct inode *, struct file *);
368extern int nfs_attribute_timeout(struct inode *inode);
369extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
370extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
44b11874 371extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
1da177e4 372extern int nfs_setattr(struct dentry *, struct iattr *);
65e4308d 373extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
1da177e4
LT		 374extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
375extern void put_nfs_open_context(struct nfs_open_context *ctx);
dc0b027d 376extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
5ede7b1c 377extern struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode);
cd9a1c0e 378extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
f11ac8db
TM		 379extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
380extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
f43bf0be 381extern u64 nfs_compat_user_ino64(u64 fileid);
4704f0e2 382extern void nfs_fattr_init(struct nfs_fattr *fattr);
56463e50 383extern unsigned long nfs_inc_attr_generation_counter(void);
1da177e4 384
2d36bfde
TM		 385extern struct nfs_fattr *nfs_alloc_fattr(void);
386
387static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
388{
389 kfree(fattr);
390}
391
392extern struct nfs_fh *nfs_alloc_fhandle(void);
393
394static inline void nfs_free_fhandle(const struct nfs_fh *fh)
395{
396 kfree(fh);
397}
398
e27d359e 399#ifdef NFS_DEBUG
d8e0539e
WAA		 400extern u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh);
401static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
402{
403 return _nfs_display_fhandle_hash(fh);
404}
20d27e92
CL		 405extern void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption);
406#define nfs_display_fhandle(fh, caption) \
407 do { \
408 if (unlikely(nfs_debug & NFSDBG_FACILITY)) \
409 _nfs_display_fhandle(fh, caption); \
410 } while (0)
411#else
d8e0539e
WAA		 412static inline u32 nfs_display_fhandle_hash(const struct nfs_fh *fh)
413{
9304a812 414 return 0;
d8e0539e 415}
20d27e92
CL		 416static inline void nfs_display_fhandle(const struct nfs_fh *fh,
417 const char *caption)
418{
419}
420#endif
421
56463e50
CL		 422/*
423 * linux/fs/nfs/nfsroot.c
424 */
425extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
1da177e4 426/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
5a874db4 427extern __be32 root_nfs_parse_addr(char *name); /*__init*/
0e574af1 428
1da177e4
LT		 429/*
430 * linux/fs/nfs/file.c
431 */
4b6f5d20 432extern const struct file_operations nfs_file_operations;
89d77c8f 433#if IS_ENABLED(CONFIG_NFS_V4)
1788ea6e
JL		 434extern const struct file_operations nfs4_file_operations;
435#endif /* CONFIG_NFS_V4 */
f5e54d6e 436extern const struct address_space_operations nfs_file_aops;
11de3b11 437extern const struct address_space_operations nfs_dir_aops;
1da177e4 438
c03025d5
TM		 439static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
440{
441 return filp->private_data;
442}
443
1da177e4
LT		 444static inline struct rpc_cred *nfs_file_cred(struct file *file)
445{
504e5189
NB		 446 if (file != NULL) {
447 struct nfs_open_context *ctx =
448 nfs_file_open_context(file);
449 if (ctx)
450 return ctx->cred;
451 }
1da177e4
LT		 452 return NULL;
453}
454
b7fa0554
AG		 455/*
456 * linux/fs/nfs/xattr.c
457 */
458#ifdef CONFIG_NFS_V3_ACL
459extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
460extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
461extern int nfs3_setxattr(struct dentry *, const char *,
462 const void *, size_t, int);
463extern int nfs3_removexattr (struct dentry *, const char *name);
464#else
465# define nfs3_listxattr NULL
466# define nfs3_getxattr NULL
467# define nfs3_setxattr NULL
468# define nfs3_removexattr NULL
469#endif
470
1da177e4
LT		 471/*
472 * linux/fs/nfs/direct.c
473 */
474extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
475 unsigned long);
027445c3
BP		 476extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
477 const struct iovec *iov, unsigned long nr_segs,
a564b8f0 478 loff_t pos, bool uio);
027445c3
BP		 479extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
480 const struct iovec *iov, unsigned long nr_segs,
a564b8f0 481 loff_t pos, bool uio);
1da177e4
LT		 482
483/*
484 * linux/fs/nfs/dir.c
485 */
4b6f5d20 486extern const struct file_operations nfs_dir_operations;
f786aa90 487extern const struct dentry_operations nfs_dentry_operations;
1da177e4 488
bfc69a45 489extern void nfs_force_lookup_revalidate(struct inode *dir);
1da177e4 490extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
af22f94a
TM		 491extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
492extern void nfs_access_zap_cache(struct inode *inode);
1da177e4
LT		 493
494/*
495 * linux/fs/nfs/symlink.c
496 */
c5ef1c42 497extern const struct inode_operations nfs_symlink_inode_operations;
1da177e4 498
a72b4422
TM		 499/*
500 * linux/fs/nfs/sysctl.c
501 */
502#ifdef CONFIG_SYSCTL
503extern int nfs_register_sysctl(void);
504extern void nfs_unregister_sysctl(void);
505#else
7fd105e7 506#define nfs_register_sysctl() 0
a72b4422
TM		 507#define nfs_unregister_sysctl() do { } while(0)
508#endif
509
55a97593
TM		 510/*
511 * linux/fs/nfs/namespace.c
512 */
c5ef1c42
AV		 513extern const struct inode_operations nfs_mountpoint_inode_operations;
514extern const struct inode_operations nfs_referral_inode_operations;
51d8fa6a
TM		 515extern int nfs_mountpoint_expiry_timeout;
516extern void nfs_release_automount_timer(void);
55a97593 517
1da177e4
LT		 518/*
519 * linux/fs/nfs/unlink.c
520 */
e4eff1a6 521extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
565277f6
TM		 522extern void nfs_block_sillyrename(struct dentry *dentry);
523extern void nfs_unblock_sillyrename(struct dentry *dentry);
779c5179 524extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
1da177e4
LT		 525
526/*
527 * linux/fs/nfs/write.c
528 */
89a09141 529extern int nfs_congestion_kb;
1da177e4
LT		 530extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
531extern int nfs_writepages(struct address_space *, struct writeback_control *);
532extern int nfs_flush_incompatible(struct file *file, struct page *page);
533extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
13602896 534extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
1da177e4
LT		 535
536/*
537 * Try to write back everything synchronously (but check the
538 * return value!)
539 */
1c75950b
TM		 540extern int nfs_wb_all(struct inode *inode);
541extern int nfs_wb_page(struct inode *inode, struct page* page);
1b3b4a1a 542extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
89d77c8f 543#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
b608b283 544extern int nfs_commit_inode(struct inode *, int);
0b7c0153
FI		 545extern struct nfs_commit_data *nfs_commitdata_alloc(void);
546extern void nfs_commit_free(struct nfs_commit_data *data);
77a63f3d
TM		 547#else
548static inline int
549nfs_commit_inode(struct inode *inode, int how)
550{
551 return 0;
552}
1da177e4
LT		 553#endif
554
555static inline int
556nfs_have_writebacks(struct inode *inode)
557{
558 return NFS_I(inode)->npages != 0;
559}
560
1da177e4
LT		 561/*
562 * linux/fs/nfs/read.c
563 */
564extern int nfs_readpage(struct file *, struct page *);
565extern int nfs_readpages(struct file *, struct address_space *,
566 struct list_head *, unsigned);
ec06c096 567extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
f42b293d
DH		 568extern int nfs_readpage_async(struct nfs_open_context *, struct inode *,
569 struct page *);
963d8fe5 570
b7fa0554
AG		 571/*
572 * linux/fs/nfs3proc.c
573 */
574#ifdef CONFIG_NFS_V3_ACL
575extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
576extern int nfs3_proc_setacl(struct inode *inode, int type,
577 struct posix_acl *acl);
055ffbea 578extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
d3fb6120 579 umode_t mode);
5c6a9f7d 580extern void nfs3_forget_cached_acls(struct inode *inode);
055ffbea
AG		 581#else
582static inline int nfs3_proc_set_default_acl(struct inode *dir,
583 struct inode *inode,
d3fb6120 584 umode_t mode)
055ffbea
AG		 585{
586 return 0;
587}
5c6a9f7d
AG		 588
589static inline void nfs3_forget_cached_acls(struct inode *inode)
590{
591}
b7fa0554
AG		 592#endif /* CONFIG_NFS_V3_ACL */
593
1da177e4
LT		 594/*
595 * inline functions
596 */
597
433c9237 598static inline loff_t nfs_size_to_loff_t(__u64 size)
1da177e4 599{
433c9237
CL		 600 if (size > (__u64) OFFSET_MAX - 1)
601 return OFFSET_MAX - 1;
1da177e4
LT		 602 return (loff_t) size;
603}
604
605static inline ino_t
606nfs_fileid_to_ino_t(u64 fileid)
607{
608 ino_t ino = (ino_t) fileid;
609 if (sizeof(ino_t) < sizeof(u64))
610 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
611 return ino;
612}
613
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LT		 614#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
615
1da177e4
LT		 616#endif /* __KERNEL__ */
617
618/*
619 * NFS debug flags
620 */
621#define NFSDBG_VFS 0x0001
622#define NFSDBG_DIRCACHE 0x0002
623#define NFSDBG_LOOKUPCACHE 0x0004
624#define NFSDBG_PAGECACHE 0x0008
625#define NFSDBG_PROC 0x0010
626#define NFSDBG_XDR 0x0020
627#define NFSDBG_FILE 0x0040
628#define NFSDBG_ROOT 0x0080
629#define NFSDBG_CALLBACK 0x0100
24c8dbbb 630#define NFSDBG_CLIENT 0x0200
f1828993 631#define NFSDBG_MOUNT 0x0400
c6a6f19e 632#define NFSDBG_FSCACHE 0x0800
85e174ba 633#define NFSDBG_PNFS 0x1000
7ab672ce 634#define NFSDBG_PNFS_LD 0x2000
e3c0fb7e 635#define NFSDBG_STATE 0x4000
1da177e4
LT		 636#define NFSDBG_ALL 0xFFFF
637
638#ifdef __KERNEL__
4dc2eaec 639
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LT		 640# undef ifdebug
641# ifdef NFS_DEBUG
642# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
6f00866d 643# define NFS_IFDEBUG(x) x
1da177e4
LT		 644# else
645# define ifdebug(fac) if (0)
6f00866d 646# define NFS_IFDEBUG(x)
1da177e4
LT		 647# endif
648#endif /* __KERNEL */
649
650#endif
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