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
12 #include <linux/magic.h>
13
14 /* Default timeout values */
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
20 #define NFS_MAX_UDP_TIMEOUT (60*HZ)
21 #define NFS_MAX_TCP_TIMEOUT (600*HZ)
22
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
28 /*
29 * When flushing a cluster of dirty pages, there can be different
30 * strategies:
31 */
32 #define FLUSH_SYNC 1 /* file being synced, or contention */
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 */
36 #define FLUSH_COND_STABLE 32 /* conditional stable write - only stable
37 * if everything fits in one RPC */
38
39 #ifdef __KERNEL__
40
41 #include <linux/in.h>
42 #include <linux/mm.h>
43 #include <linux/pagemap.h>
44 #include <linux/rbtree.h>
45 #include <linux/rwsem.h>
46 #include <linux/wait.h>
47
48 #include <linux/sunrpc/debug.h>
49 #include <linux/sunrpc/auth.h>
50 #include <linux/sunrpc/clnt.h>
51
52 #include <linux/nfs.h>
53 #include <linux/nfs2.h>
54 #include <linux/nfs3.h>
55 #include <linux/nfs4.h>
56 #include <linux/nfs_xdr.h>
57 #include <linux/nfs_fs_sb.h>
58
59 #include <linux/mempool.h>
60
61 /*
62 * These are the default flags for swap requests
63 */
64 #define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
65
66 /*
67 * NFSv3/v4 Access mode cache entry
68 */
69 struct nfs_access_entry {
70 struct rb_node rb_node;
71 struct list_head lru;
72 unsigned long jiffies;
73 struct rpc_cred * cred;
74 int mask;
75 };
76
77 struct nfs_lock_context {
78 atomic_t count;
79 struct list_head list;
80 struct nfs_open_context *open_context;
81 fl_owner_t lockowner;
82 pid_t pid;
83 };
84
85 struct nfs4_state;
86 struct nfs_open_context {
87 struct nfs_lock_context lock_context;
88 struct path path;
89 struct rpc_cred *cred;
90 struct nfs4_state *state;
91 fmode_t mode;
92
93 unsigned long flags;
94 #define NFS_CONTEXT_ERROR_WRITE (0)
95 int error;
96
97 struct list_head list;
98 };
99
100 struct nfs_open_dir_context {
101 struct rpc_cred *cred;
102 __u64 dir_cookie;
103 __u64 dup_cookie;
104 int duped;
105 };
106
107 /*
108 * NFSv4 delegation
109 */
110 struct nfs_delegation;
111
112 struct posix_acl;
113
114 /*
115 * nfs fs inode data in memory
116 */
117 struct nfs_inode {
118 /*
119 * The 64bit 'inode number'
120 */
121 __u64 fileid;
122
123 /*
124 * NFS file handle
125 */
126 struct nfs_fh fh;
127
128 /*
129 * Various flags
130 */
131 unsigned long flags; /* atomic bit ops */
132 unsigned long cache_validity; /* bit mask */
133
134 /*
135 * read_cache_jiffies is when we started read-caching this inode.
136 * attrtimeo is for how long the cached information is assumed
137 * to be valid. A successful attribute revalidation doubles
138 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
139 * acregmin/acdirmin.
140 *
141 * We need to revalidate the cached attrs for this inode if
142 *
143 * jiffies - read_cache_jiffies >= attrtimeo
144 *
145 * Please note the comparison is greater than or equal
146 * so that zero timeout values can be specified.
147 */
148 unsigned long read_cache_jiffies;
149 unsigned long attrtimeo;
150 unsigned long attrtimeo_timestamp;
151 __u64 change_attr; /* v4 only */
152
153 unsigned long attr_gencount;
154 /* "Generation counter" for the attribute cache. This is
155 * bumped whenever we update the metadata on the
156 * server.
157 */
158 unsigned long cache_change_attribute;
159
160 struct rb_root access_cache;
161 struct list_head access_cache_entry_lru;
162 struct list_head access_cache_inode_lru;
163 #ifdef CONFIG_NFS_V3_ACL
164 struct posix_acl *acl_access;
165 struct posix_acl *acl_default;
166 #endif
167
168 /*
169 * This is the cookie verifier used for NFSv3 readdir
170 * operations
171 */
172 __be32 cookieverf[2];
173
174 /*
175 * This is the list of dirty unwritten pages.
176 */
177 struct radix_tree_root nfs_page_tree;
178
179 unsigned long npages;
180 unsigned long ncommit;
181
182 /* Open contexts for shared mmap writes */
183 struct list_head open_files;
184
185 /* Number of in-flight sillydelete RPC calls */
186 atomic_t silly_count;
187 /* List of deferred sillydelete requests */
188 struct hlist_head silly_list;
189 wait_queue_head_t waitqueue;
190
191 #ifdef CONFIG_NFS_V4
192 struct nfs4_cached_acl *nfs4_acl;
193 /* NFSv4 state */
194 struct list_head open_states;
195 struct nfs_delegation __rcu *delegation;
196 fmode_t delegation_state;
197 struct rw_semaphore rwsem;
198
199 /* pNFS layout information */
200 struct pnfs_layout_hdr *layout;
201 atomic_t commits_outstanding;
202 #endif /* CONFIG_NFS_V4*/
203 #ifdef CONFIG_NFS_FSCACHE
204 struct fscache_cookie *fscache;
205 #endif
206 struct inode vfs_inode;
207 };
208
209 /*
210 * Cache validity bit flags
211 */
212 #define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
213 #define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
214 #define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
215 #define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
216 #define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
217 #define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
218 #define NFS_INO_REVAL_FORCED 0x0040 /* force revalidation ignoring a delegation */
219
220 /*
221 * Bit offsets in flags field
222 */
223 #define NFS_INO_ADVISE_RDPLUS (0) /* advise readdirplus */
224 #define NFS_INO_STALE (1) /* possible stale inode */
225 #define NFS_INO_ACL_LRU_SET (2) /* Inode is on the LRU list */
226 #define NFS_INO_FLUSHING (4) /* inode is flushing out data */
227 #define NFS_INO_FSCACHE (5) /* inode can be cached by FS-Cache */
228 #define NFS_INO_FSCACHE_LOCK (6) /* FS-Cache cookie management lock */
229 #define NFS_INO_COMMIT (7) /* inode is committing unstable writes */
230 #define NFS_INO_PNFS_COMMIT (8) /* use pnfs code for commit */
231 #define NFS_INO_LAYOUTCOMMIT (9) /* layoutcommit required */
232
NFS_I(const struct inode * inode)233 static inline struct nfs_inode *NFS_I(const struct inode *inode)
234 {
235 return container_of(inode, struct nfs_inode, vfs_inode);
236 }
237
NFS_SB(const struct super_block * s)238 static inline struct nfs_server *NFS_SB(const struct super_block *s)
239 {
240 return (struct nfs_server *)(s->s_fs_info);
241 }
242
NFS_FH(const struct inode * inode)243 static inline struct nfs_fh *NFS_FH(const struct inode *inode)
244 {
245 return &NFS_I(inode)->fh;
246 }
247
NFS_SERVER(const struct inode * inode)248 static inline struct nfs_server *NFS_SERVER(const struct inode *inode)
249 {
250 return NFS_SB(inode->i_sb);
251 }
252
NFS_CLIENT(const struct inode * inode)253 static inline struct rpc_clnt *NFS_CLIENT(const struct inode *inode)
254 {
255 return NFS_SERVER(inode)->client;
256 }
257
NFS_PROTO(const struct inode * inode)258 static inline const struct nfs_rpc_ops *NFS_PROTO(const struct inode *inode)
259 {
260 return NFS_SERVER(inode)->nfs_client->rpc_ops;
261 }
262
NFS_COOKIEVERF(const struct inode * inode)263 static inline __be32 *NFS_COOKIEVERF(const struct inode *inode)
264 {
265 return NFS_I(inode)->cookieverf;
266 }
267
NFS_MINATTRTIMEO(const struct inode * inode)268 static inline unsigned NFS_MINATTRTIMEO(const struct inode *inode)
269 {
270 struct nfs_server *nfss = NFS_SERVER(inode);
271 return S_ISDIR(inode->i_mode) ? nfss->acdirmin : nfss->acregmin;
272 }
273
NFS_MAXATTRTIMEO(const struct inode * inode)274 static inline unsigned NFS_MAXATTRTIMEO(const struct inode *inode)
275 {
276 struct nfs_server *nfss = NFS_SERVER(inode);
277 return S_ISDIR(inode->i_mode) ? nfss->acdirmax : nfss->acregmax;
278 }
279
NFS_STALE(const struct inode * inode)280 static inline int NFS_STALE(const struct inode *inode)
281 {
282 return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
283 }
284
NFS_FSCACHE(const struct inode * inode)285 static inline int NFS_FSCACHE(const struct inode *inode)
286 {
287 return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
288 }
289
NFS_FILEID(const struct inode * inode)290 static inline __u64 NFS_FILEID(const struct inode *inode)
291 {
292 return NFS_I(inode)->fileid;
293 }
294
set_nfs_fileid(struct inode * inode,__u64 fileid)295 static inline void set_nfs_fileid(struct inode *inode, __u64 fileid)
296 {
297 NFS_I(inode)->fileid = fileid;
298 }
299
nfs_mark_for_revalidate(struct inode * inode)300 static inline void nfs_mark_for_revalidate(struct inode *inode)
301 {
302 struct nfs_inode *nfsi = NFS_I(inode);
303
304 spin_lock(&inode->i_lock);
305 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
306 if (S_ISDIR(inode->i_mode))
307 nfsi->cache_validity |= NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
308 spin_unlock(&inode->i_lock);
309 }
310
nfs_server_capable(struct inode * inode,int cap)311 static inline int nfs_server_capable(struct inode *inode, int cap)
312 {
313 return NFS_SERVER(inode)->caps & cap;
314 }
315
NFS_USE_READDIRPLUS(struct inode * inode)316 static inline int NFS_USE_READDIRPLUS(struct inode *inode)
317 {
318 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
319 }
320
nfs_set_verifier(struct dentry * dentry,unsigned long verf)321 static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf)
322 {
323 dentry->d_time = verf;
324 }
325
326 /**
327 * nfs_save_change_attribute - Returns the inode attribute change cookie
328 * @dir - pointer to parent directory inode
329 * The "change attribute" is updated every time we finish an operation
330 * that will result in a metadata change on the server.
331 */
nfs_save_change_attribute(struct inode * dir)332 static inline unsigned long nfs_save_change_attribute(struct inode *dir)
333 {
334 return NFS_I(dir)->cache_change_attribute;
335 }
336
337 /**
338 * nfs_verify_change_attribute - Detects NFS remote directory changes
339 * @dir - pointer to parent directory inode
340 * @chattr - previously saved change attribute
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.
344 */
nfs_verify_change_attribute(struct inode * dir,unsigned long chattr)345 static inline int nfs_verify_change_attribute(struct inode *dir, unsigned long chattr)
346 {
347 return chattr == NFS_I(dir)->cache_change_attribute;
348 }
349
350 /*
351 * linux/fs/nfs/inode.c
352 */
353 extern int nfs_sync_mapping(struct address_space *mapping);
354 extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
355 extern void nfs_zap_caches(struct inode *);
356 extern void nfs_invalidate_atime(struct inode *);
357 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
358 struct nfs_fattr *);
359 extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
360 extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
361 extern int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr);
362 extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
363 extern int nfs_permission(struct inode *, int, unsigned int);
364 extern int nfs_open(struct inode *, struct file *);
365 extern int nfs_release(struct inode *, struct file *);
366 extern int nfs_attribute_timeout(struct inode *inode);
367 extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
368 extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
369 extern int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
370 extern int nfs_setattr(struct dentry *, struct iattr *);
371 extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
372 extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
373 extern void put_nfs_open_context(struct nfs_open_context *ctx);
374 extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode);
375 extern struct nfs_open_context *alloc_nfs_open_context(struct path *path, struct rpc_cred *cred, fmode_t f_mode);
376 extern void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx);
377 extern struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx);
378 extern void nfs_put_lock_context(struct nfs_lock_context *l_ctx);
379 extern u64 nfs_compat_user_ino64(u64 fileid);
380 extern void nfs_fattr_init(struct nfs_fattr *fattr);
381 extern unsigned long nfs_inc_attr_generation_counter(void);
382
383 extern struct nfs_fattr *nfs_alloc_fattr(void);
384
nfs_free_fattr(const struct nfs_fattr * fattr)385 static inline void nfs_free_fattr(const struct nfs_fattr *fattr)
386 {
387 kfree(fattr);
388 }
389
390 extern struct nfs_fh *nfs_alloc_fhandle(void);
391
nfs_free_fhandle(const struct nfs_fh * fh)392 static inline void nfs_free_fhandle(const struct nfs_fh *fh)
393 {
394 kfree(fh);
395 }
396
397 /*
398 * linux/fs/nfs/nfsroot.c
399 */
400 extern int nfs_root_data(char **root_device, char **root_data); /*__init*/
401 /* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
402 extern __be32 root_nfs_parse_addr(char *name); /*__init*/
403
404 /*
405 * linux/fs/nfs/file.c
406 */
407 extern const struct inode_operations nfs_file_inode_operations;
408 #ifdef CONFIG_NFS_V3
409 extern const struct inode_operations nfs3_file_inode_operations;
410 #endif /* CONFIG_NFS_V3 */
411 extern const struct file_operations nfs_file_operations;
412 extern const struct address_space_operations nfs_file_aops;
413 extern const struct address_space_operations nfs_dir_aops;
414
nfs_file_open_context(struct file * filp)415 static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
416 {
417 return filp->private_data;
418 }
419
nfs_file_cred(struct file * file)420 static inline struct rpc_cred *nfs_file_cred(struct file *file)
421 {
422 if (file != NULL) {
423 struct nfs_open_context *ctx =
424 nfs_file_open_context(file);
425 if (ctx)
426 return ctx->cred;
427 }
428 return NULL;
429 }
430
431 /*
432 * linux/fs/nfs/xattr.c
433 */
434 #ifdef CONFIG_NFS_V3_ACL
435 extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
436 extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
437 extern int nfs3_setxattr(struct dentry *, const char *,
438 const void *, size_t, int);
439 extern int nfs3_removexattr (struct dentry *, const char *name);
440 #else
441 # define nfs3_listxattr NULL
442 # define nfs3_getxattr NULL
443 # define nfs3_setxattr NULL
444 # define nfs3_removexattr NULL
445 #endif
446
447 /*
448 * linux/fs/nfs/direct.c
449 */
450 extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
451 unsigned long);
452 extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
453 const struct iovec *iov, unsigned long nr_segs,
454 loff_t pos);
455 extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
456 const struct iovec *iov, unsigned long nr_segs,
457 loff_t pos);
458
459 /*
460 * linux/fs/nfs/dir.c
461 */
462 extern const struct inode_operations nfs_dir_inode_operations;
463 #ifdef CONFIG_NFS_V3
464 extern const struct inode_operations nfs3_dir_inode_operations;
465 #endif /* CONFIG_NFS_V3 */
466 extern const struct file_operations nfs_dir_operations;
467 extern const struct dentry_operations nfs_dentry_operations;
468
469 extern void nfs_force_lookup_revalidate(struct inode *dir);
470 extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
471 extern int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags);
472 extern void nfs_access_zap_cache(struct inode *inode);
473
474 /*
475 * linux/fs/nfs/symlink.c
476 */
477 extern const struct inode_operations nfs_symlink_inode_operations;
478
479 /*
480 * linux/fs/nfs/sysctl.c
481 */
482 #ifdef CONFIG_SYSCTL
483 extern int nfs_register_sysctl(void);
484 extern void nfs_unregister_sysctl(void);
485 #else
486 #define nfs_register_sysctl() 0
487 #define nfs_unregister_sysctl() do { } while(0)
488 #endif
489
490 /*
491 * linux/fs/nfs/namespace.c
492 */
493 extern const struct inode_operations nfs_mountpoint_inode_operations;
494 extern const struct inode_operations nfs_referral_inode_operations;
495 extern int nfs_mountpoint_expiry_timeout;
496 extern void nfs_release_automount_timer(void);
497
498 /*
499 * linux/fs/nfs/unlink.c
500 */
501 extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
502 extern void nfs_block_sillyrename(struct dentry *dentry);
503 extern void nfs_unblock_sillyrename(struct dentry *dentry);
504 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
505
506 /*
507 * linux/fs/nfs/write.c
508 */
509 extern int nfs_congestion_kb;
510 extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
511 extern int nfs_writepages(struct address_space *, struct writeback_control *);
512 extern int nfs_flush_incompatible(struct file *file, struct page *page);
513 extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
514 extern void nfs_writeback_done(struct rpc_task *, struct nfs_write_data *);
515
516 /*
517 * Try to write back everything synchronously (but check the
518 * return value!)
519 */
520 extern int nfs_wb_all(struct inode *inode);
521 extern int nfs_wb_page(struct inode *inode, struct page* page);
522 extern int nfs_wb_page_cancel(struct inode *inode, struct page* page);
523 #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
524 extern int nfs_commit_inode(struct inode *, int);
525 extern struct nfs_write_data *nfs_commitdata_alloc(void);
526 extern void nfs_commit_free(struct nfs_write_data *wdata);
527 #else
528 static inline int
nfs_commit_inode(struct inode * inode,int how)529 nfs_commit_inode(struct inode *inode, int how)
530 {
531 return 0;
532 }
533 #endif
534
535 static inline int
nfs_have_writebacks(struct inode * inode)536 nfs_have_writebacks(struct inode *inode)
537 {
538 return NFS_I(inode)->npages != 0;
539 }
540
541 /*
542 * Allocate nfs_write_data structures
543 */
544 extern struct nfs_write_data *nfs_writedata_alloc(unsigned int npages);
545 extern void nfs_writedata_free(struct nfs_write_data *);
546
547 /*
548 * linux/fs/nfs/read.c
549 */
550 extern int nfs_readpage(struct file *, struct page *);
551 extern int nfs_readpages(struct file *, struct address_space *,
552 struct list_head *, unsigned);
553 extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
554 extern int nfs_readpage_async(struct nfs_open_context *, struct inode *,
555 struct page *);
556
557 /*
558 * Allocate nfs_read_data structures
559 */
560 extern struct nfs_read_data *nfs_readdata_alloc(unsigned int npages);
561 extern void nfs_readdata_free(struct nfs_read_data *);
562
563 /*
564 * linux/fs/nfs3proc.c
565 */
566 #ifdef CONFIG_NFS_V3_ACL
567 extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
568 extern int nfs3_proc_setacl(struct inode *inode, int type,
569 struct posix_acl *acl);
570 extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
571 mode_t mode);
572 extern void nfs3_forget_cached_acls(struct inode *inode);
573 #else
nfs3_proc_set_default_acl(struct inode * dir,struct inode * inode,mode_t mode)574 static inline int nfs3_proc_set_default_acl(struct inode *dir,
575 struct inode *inode,
576 mode_t mode)
577 {
578 return 0;
579 }
580
nfs3_forget_cached_acls(struct inode * inode)581 static inline void nfs3_forget_cached_acls(struct inode *inode)
582 {
583 }
584 #endif /* CONFIG_NFS_V3_ACL */
585
586 /*
587 * inline functions
588 */
589
nfs_size_to_loff_t(__u64 size)590 static inline loff_t nfs_size_to_loff_t(__u64 size)
591 {
592 if (size > (__u64) OFFSET_MAX - 1)
593 return OFFSET_MAX - 1;
594 return (loff_t) size;
595 }
596
597 static inline ino_t
nfs_fileid_to_ino_t(u64 fileid)598 nfs_fileid_to_ino_t(u64 fileid)
599 {
600 ino_t ino = (ino_t) fileid;
601 if (sizeof(ino_t) < sizeof(u64))
602 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
603 return ino;
604 }
605
606 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
607
608 #endif /* __KERNEL__ */
609
610 /*
611 * NFS debug flags
612 */
613 #define NFSDBG_VFS 0x0001
614 #define NFSDBG_DIRCACHE 0x0002
615 #define NFSDBG_LOOKUPCACHE 0x0004
616 #define NFSDBG_PAGECACHE 0x0008
617 #define NFSDBG_PROC 0x0010
618 #define NFSDBG_XDR 0x0020
619 #define NFSDBG_FILE 0x0040
620 #define NFSDBG_ROOT 0x0080
621 #define NFSDBG_CALLBACK 0x0100
622 #define NFSDBG_CLIENT 0x0200
623 #define NFSDBG_MOUNT 0x0400
624 #define NFSDBG_FSCACHE 0x0800
625 #define NFSDBG_PNFS 0x1000
626 #define NFSDBG_PNFS_LD 0x2000
627 #define NFSDBG_ALL 0xFFFF
628
629 #ifdef __KERNEL__
630
631 /*
632 * Enable debugging support for nfs client.
633 * Requires RPC_DEBUG.
634 */
635 #ifdef RPC_DEBUG
636 # define NFS_DEBUG
637 #endif
638
639 # undef ifdebug
640 # ifdef NFS_DEBUG
641 # define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
642 # else
643 # define ifdebug(fac) if (0)
644 # endif
645 #endif /* __KERNEL */
646
647 #endif
648