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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
12#include <linux/config.h>
13#include <linux/in.h>
14#include <linux/mm.h>
15#include <linux/pagemap.h>
16#include <linux/rwsem.h>
17#include <linux/wait.h>
1da177e4
LT		 18
19#include <linux/nfs_fs_sb.h>
20
21#include <linux/sunrpc/debug.h>
22#include <linux/sunrpc/auth.h>
23#include <linux/sunrpc/clnt.h>
24
25#include <linux/nfs.h>
26#include <linux/nfs2.h>
27#include <linux/nfs3.h>
28#include <linux/nfs4.h>
29#include <linux/nfs_xdr.h>
30#include <linux/rwsem.h>
1da177e4
LT		 31#include <linux/mempool.h>
32
33/*
34 * Enable debugging support for nfs client.
35 * Requires RPC_DEBUG.
36 */
37#ifdef RPC_DEBUG
38# define NFS_DEBUG
39#endif
40
03bf4b70
CL		 41/* Default timeout values */
42#define NFS_MAX_UDP_TIMEOUT (60*HZ)
43#define NFS_MAX_TCP_TIMEOUT (600*HZ)
44
1da177e4
LT		 45/*
46 * superblock magic number for NFS
47 */
48#define NFS_SUPER_MAGIC 0x6969
49
50/*
51 * These are the default flags for swap requests
52 */
53#define NFS_RPC_SWAPFLAGS (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS)
54
1da177e4
LT		 55/*
56 * When flushing a cluster of dirty pages, there can be different
57 * strategies:
58 */
59#define FLUSH_AGING 0 /* only flush old buffers */
60#define FLUSH_SYNC 1 /* file being synced, or contention */
61#define FLUSH_WAIT 2 /* wait for completion */
62#define FLUSH_STABLE 4 /* commit to stable storage */
63#define FLUSH_LOWPRI 8 /* low priority background flush */
64#define FLUSH_HIGHPRI 16 /* high priority memory reclaim flush */
70b9ecbd 65#define FLUSH_NOCOMMIT 32 /* Don't send the NFSv3/v4 COMMIT */
1da177e4
LT		 66
67#ifdef __KERNEL__
68
69/*
70 * NFSv3/v4 Access mode cache entry
71 */
72struct nfs_access_entry {
73 unsigned long jiffies;
74 struct rpc_cred * cred;
75 int mask;
76};
77
78struct nfs4_state;
79struct nfs_open_context {
80 atomic_t count;
b92dccf6 81 struct vfsmount *vfsmnt;
1da177e4
LT		 82 struct dentry *dentry;
83 struct rpc_cred *cred;
84 struct nfs4_state *state;
85 fl_owner_t lockowner;
86 int mode;
87 int error;
88
89 struct list_head list;
00a92642 90
00a92642 91 __u64 dir_cookie;
1da177e4
LT		 92};
93
94/*
95 * NFSv4 delegation
96 */
97struct nfs_delegation;
98
5c6a9f7d
AG		 99struct posix_acl;
100
1da177e4
LT		 101/*
102 * nfs fs inode data in memory
103 */
104struct nfs_inode {
105 /*
106 * The 64bit 'inode number'
107 */
108 __u64 fileid;
109
110 /*
111 * NFS file handle
112 */
113 struct nfs_fh fh;
114
115 /*
116 * Various flags
117 */
412d582e
CL		 118 unsigned long flags; /* atomic bit ops */
119 unsigned long cache_validity; /* bit mask */
1da177e4
LT		 120
121 /*
122 * read_cache_jiffies is when we started read-caching this inode,
123 * and read_cache_mtime is the mtime of the inode at that time.
124 * attrtimeo is for how long the cached information is assumed
125 * to be valid. A successful attribute revalidation doubles
126 * attrtimeo (up to acregmax/acdirmax), a failure resets it to
127 * acregmin/acdirmin.
128 *
129 * We need to revalidate the cached attrs for this inode if
130 *
131 * jiffies - read_cache_jiffies > attrtimeo
132 *
133 * and invalidate any cached data/flush out any dirty pages if
134 * we find that
135 *
136 * mtime != read_cache_mtime
137 */
1da177e4
LT		 138 unsigned long read_cache_jiffies;
139 unsigned long attrtimeo;
140 unsigned long attrtimeo_timestamp;
141 __u64 change_attr; /* v4 only */
142
33801147 143 unsigned long last_updated;
1da177e4
LT		 144 /* "Generation counter" for the attribute cache. This is
145 * bumped whenever we update the metadata on the
146 * server.
147 */
148 unsigned long cache_change_attribute;
149 /*
150 * Counter indicating the number of outstanding requests that
151 * will cause a file data update.
152 */
153 atomic_t data_updates;
154
155 struct nfs_access_entry cache_access;
5c6a9f7d
AG		 156#ifdef CONFIG_NFS_V3_ACL
157 struct posix_acl *acl_access;
158 struct posix_acl *acl_default;
159#endif
1da177e4
LT		 160
161 /*
162 * This is the cookie verifier used for NFSv3 readdir
163 * operations
164 */
165 __u32 cookieverf[2];
166
167 /*
168 * This is the list of dirty unwritten pages.
169 */
170 spinlock_t req_lock;
171 struct list_head dirty;
172 struct list_head commit;
173 struct radix_tree_root nfs_page_tree;
174
175 unsigned int ndirty,
176 ncommit,
177 npages;
178
179 /* Open contexts for shared mmap writes */
180 struct list_head open_files;
181
1da177e4 182#ifdef CONFIG_NFS_V4
e50a1c2e 183 struct nfs4_cached_acl *nfs4_acl;
1da177e4
LT		 184 /* NFSv4 state */
185 struct list_head open_states;
186 struct nfs_delegation *delegation;
187 int delegation_state;
188 struct rw_semaphore rwsem;
189#endif /* CONFIG_NFS_V4*/
1da177e4
LT		 190 struct inode vfs_inode;
191};
192
193/*
55296809 194 * Cache validity bit flags
1da177e4 195 */
55296809
CL		 196#define NFS_INO_INVALID_ATTR 0x0001 /* cached attrs are invalid */
197#define NFS_INO_INVALID_DATA 0x0002 /* cached data is invalid */
198#define NFS_INO_INVALID_ATIME 0x0004 /* cached atime is invalid */
199#define NFS_INO_INVALID_ACCESS 0x0008 /* cached access cred invalid */
200#define NFS_INO_INVALID_ACL 0x0010 /* cached acls are invalid */
201#define NFS_INO_REVAL_PAGECACHE 0x0020 /* must revalidate pagecache */
202
203/*
412d582e 204 * Bit offsets in flags field
55296809 205 */
412d582e
CL		 206#define NFS_INO_REVALIDATING (0) /* revalidating attrs */
207#define NFS_INO_ADVISE_RDPLUS (1) /* advise readdirplus */
208#define NFS_INO_STALE (2) /* possible stale inode */
1da177e4
LT		 209
210static inline struct nfs_inode *NFS_I(struct inode *inode)
211{
212 return container_of(inode, struct nfs_inode, vfs_inode);
213}
214#define NFS_SB(s) ((struct nfs_server *)(s->s_fs_info))
215
216#define NFS_FH(inode) (&NFS_I(inode)->fh)
217#define NFS_SERVER(inode) (NFS_SB(inode->i_sb))
218#define NFS_CLIENT(inode) (NFS_SERVER(inode)->client)
219#define NFS_PROTO(inode) (NFS_SERVER(inode)->rpc_ops)
220#define NFS_ADDR(inode) (RPC_PEERADDR(NFS_CLIENT(inode)))
221#define NFS_COOKIEVERF(inode) (NFS_I(inode)->cookieverf)
222#define NFS_READTIME(inode) (NFS_I(inode)->read_cache_jiffies)
223#define NFS_CHANGE_ATTR(inode) (NFS_I(inode)->change_attr)
224#define NFS_ATTRTIMEO(inode) (NFS_I(inode)->attrtimeo)
225#define NFS_MINATTRTIMEO(inode) \
226 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmin \
227 : NFS_SERVER(inode)->acregmin)
228#define NFS_MAXATTRTIMEO(inode) \
229 (S_ISDIR(inode->i_mode)? NFS_SERVER(inode)->acdirmax \
230 : NFS_SERVER(inode)->acregmax)
231#define NFS_ATTRTIMEO_UPDATE(inode) (NFS_I(inode)->attrtimeo_timestamp)
232
233#define NFS_FLAGS(inode) (NFS_I(inode)->flags)
412d582e 234#define NFS_STALE(inode) (test_bit(NFS_INO_STALE, &NFS_FLAGS(inode)))
1da177e4
LT		 235
236#define NFS_FILEID(inode) (NFS_I(inode)->fileid)
237
238static inline int nfs_caches_unstable(struct inode *inode)
239{
240 return atomic_read(&NFS_I(inode)->data_updates) != 0;
241}
242
decf491f
TM		 243static inline void nfs_mark_for_revalidate(struct inode *inode)
244{
245 spin_lock(&inode->i_lock);
246 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
247 spin_unlock(&inode->i_lock);
248}
249
1da177e4
LT		 250static inline void NFS_CACHEINV(struct inode *inode)
251{
decf491f
TM		 252 if (!nfs_caches_unstable(inode))
253 nfs_mark_for_revalidate(inode);
1da177e4
LT		 254}
255
256static inline int nfs_server_capable(struct inode *inode, int cap)
257{
258 return NFS_SERVER(inode)->caps & cap;
259}
260
261static inline int NFS_USE_READDIRPLUS(struct inode *inode)
262{
412d582e 263 return test_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
1da177e4
LT		 264}
265
266/**
267 * nfs_save_change_attribute - Returns the inode attribute change cookie
268 * @inode - pointer to inode
269 * The "change attribute" is updated every time we finish an operation
270 * that will result in a metadata change on the server.
271 */
272static inline long nfs_save_change_attribute(struct inode *inode)
273{
274 return NFS_I(inode)->cache_change_attribute;
275}
276
277/**
278 * nfs_verify_change_attribute - Detects NFS inode cache updates
279 * @inode - pointer to inode
280 * @chattr - previously saved change attribute
281 * Return "false" if metadata has been updated (or is in the process of
282 * being updated) since the change attribute was saved.
283 */
284static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long chattr)
285{
286 return !nfs_caches_unstable(inode)
913a70fc 287 && time_after_eq(chattr, NFS_I(inode)->cache_change_attribute);
1da177e4
LT		 288}
289
290/*
291 * linux/fs/nfs/inode.c
292 */
29884df0 293extern int nfs_sync_mapping(struct address_space *mapping);
1da177e4
LT		 294extern void nfs_zap_caches(struct inode *);
295extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
296 struct nfs_fattr *);
297extern int nfs_refresh_inode(struct inode *, struct nfs_fattr *);
decf491f 298extern int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr);
1da177e4
LT		 299extern int nfs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
300extern int nfs_permission(struct inode *, int, struct nameidata *);
301extern int nfs_access_get_cached(struct inode *, struct rpc_cred *, struct nfs_access_entry *);
302extern void nfs_access_add_cache(struct inode *, struct nfs_access_entry *);
303extern int nfs_open(struct inode *, struct file *);
304extern int nfs_release(struct inode *, struct file *);
305extern int nfs_attribute_timeout(struct inode *inode);
306extern int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode);
307extern int __nfs_revalidate_inode(struct nfs_server *, struct inode *);
7d52e862 308extern void nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping);
1da177e4 309extern int nfs_setattr(struct dentry *, struct iattr *);
65e4308d 310extern void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr);
1da177e4
LT		 311extern void nfs_begin_attr_update(struct inode *);
312extern void nfs_end_attr_update(struct inode *);
313extern void nfs_begin_data_update(struct inode *);
314extern void nfs_end_data_update(struct inode *);
1da177e4
LT		 315extern struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx);
316extern void put_nfs_open_context(struct nfs_open_context *ctx);
d530838b 317extern struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode);
1da177e4
LT		 318
319/* linux/net/ipv4/ipconfig.c: trims ip addr off front of name, too. */
320extern u32 root_nfs_parse_addr(char *name); /*__init*/
321
0e574af1
TM		 322static inline void nfs_fattr_init(struct nfs_fattr *fattr)
323{
324 fattr->valid = 0;
33801147 325 fattr->time_start = jiffies;
0e574af1
TM		 326}
327
1da177e4
LT		 328/*
329 * linux/fs/nfs/file.c
330 */
331extern struct inode_operations nfs_file_inode_operations;
b7fa0554
AG		 332#ifdef CONFIG_NFS_V3
333extern struct inode_operations nfs3_file_inode_operations;
334#endif /* CONFIG_NFS_V3 */
1da177e4
LT		 335extern struct file_operations nfs_file_operations;
336extern struct address_space_operations nfs_file_aops;
337
338static inline struct rpc_cred *nfs_file_cred(struct file *file)
339{
340 if (file != NULL) {
341 struct nfs_open_context *ctx;
342
343 ctx = (struct nfs_open_context*)file->private_data;
344 return ctx->cred;
345 }
346 return NULL;
347}
348
b7fa0554
AG		 349/*
350 * linux/fs/nfs/xattr.c
351 */
352#ifdef CONFIG_NFS_V3_ACL
353extern ssize_t nfs3_listxattr(struct dentry *, char *, size_t);
354extern ssize_t nfs3_getxattr(struct dentry *, const char *, void *, size_t);
355extern int nfs3_setxattr(struct dentry *, const char *,
356 const void *, size_t, int);
357extern int nfs3_removexattr (struct dentry *, const char *name);
358#else
359# define nfs3_listxattr NULL
360# define nfs3_getxattr NULL
361# define nfs3_setxattr NULL
362# define nfs3_removexattr NULL
363#endif
364
1da177e4
LT		 365/*
366 * linux/fs/nfs/direct.c
367 */
368extern ssize_t nfs_direct_IO(int, struct kiocb *, const struct iovec *, loff_t,
369 unsigned long);
370extern ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf,
371 size_t count, loff_t pos);
372extern ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf,
373 size_t count, loff_t pos);
374
375/*
376 * linux/fs/nfs/dir.c
377 */
378extern struct inode_operations nfs_dir_inode_operations;
b7fa0554
AG		 379#ifdef CONFIG_NFS_V3
380extern struct inode_operations nfs3_dir_inode_operations;
381#endif /* CONFIG_NFS_V3 */
1da177e4
LT		 382extern struct file_operations nfs_dir_operations;
383extern struct dentry_operations nfs_dentry_operations;
384
385extern int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fh, struct nfs_fattr *fattr);
386
387/*
388 * linux/fs/nfs/symlink.c
389 */
390extern struct inode_operations nfs_symlink_inode_operations;
391
a72b4422
TM		 392/*
393 * linux/fs/nfs/sysctl.c
394 */
395#ifdef CONFIG_SYSCTL
396extern int nfs_register_sysctl(void);
397extern void nfs_unregister_sysctl(void);
398#else
7fd105e7 399#define nfs_register_sysctl() 0
a72b4422
TM		 400#define nfs_unregister_sysctl() do { } while(0)
401#endif
402
1da177e4
LT		 403/*
404 * linux/fs/nfs/unlink.c
405 */
406extern int nfs_async_unlink(struct dentry *);
407extern void nfs_complete_unlink(struct dentry *);
408
409/*
410 * linux/fs/nfs/write.c
411 */
412extern int nfs_writepage(struct page *page, struct writeback_control *wbc);
413extern int nfs_writepages(struct address_space *, struct writeback_control *);
414extern int nfs_flush_incompatible(struct file *file, struct page *page);
415extern int nfs_updatepage(struct file *, struct page *, unsigned int, unsigned int);
963d8fe5
TM		 416extern void nfs_writeback_done(struct rpc_task *task, void *data);
417extern void nfs_writedata_release(void *data);
1da177e4
LT		 418
419#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
963d8fe5
TM		 420extern void nfs_commit_done(struct rpc_task *, void *data);
421extern void nfs_commit_release(void *data);
1da177e4
LT		 422#endif
423
424/*
425 * Try to write back everything synchronously (but check the
426 * return value!)
427 */
428extern int nfs_sync_inode(struct inode *, unsigned long, unsigned int, int);
429#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
3da28eb1 430extern int nfs_commit_inode(struct inode *, int);
1da177e4
LT		 431#else
432static inline int
3da28eb1 433nfs_commit_inode(struct inode *inode, int how)
1da177e4
LT		 434{
435 return 0;
436}
437#endif
438
439static inline int
440nfs_have_writebacks(struct inode *inode)
441{
442 return NFS_I(inode)->npages != 0;
443}
444
445static inline int
446nfs_wb_all(struct inode *inode)
447{
448 int error = nfs_sync_inode(inode, 0, 0, FLUSH_WAIT);
449 return (error < 0) ? error : 0;
450}
451
452/*
453 * Write back all requests on one page - we do this before reading it.
454 */
455static inline int nfs_wb_page_priority(struct inode *inode, struct page* page, int how)
456{
457 int error = nfs_sync_inode(inode, page->index, 1,
458 how | FLUSH_WAIT | FLUSH_STABLE);
459 return (error < 0) ? error : 0;
460}
461
462static inline int nfs_wb_page(struct inode *inode, struct page* page)
463{
464 return nfs_wb_page_priority(inode, page, 0);
465}
466
467/*
468 * Allocate and free nfs_write_data structures
469 */
470extern mempool_t *nfs_wdata_mempool;
471
40859d7e 472static inline struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
1da177e4
LT		 473{
474 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, SLAB_NOFS);
40859d7e 475
1da177e4
LT		 476 if (p) {
477 memset(p, 0, sizeof(*p));
478 INIT_LIST_HEAD(&p->pages);
40859d7e
CL		 479 if (pagecount < NFS_PAGEVEC_SIZE)
480 p->pagevec = &p->page_array[0];
481 else {
482 size_t size = ++pagecount * sizeof(struct page *);
483 p->pagevec = kmalloc(size, GFP_NOFS);
484 if (p->pagevec) {
485 memset(p->pagevec, 0, size);
486 } else {
487 mempool_free(p, nfs_wdata_mempool);
488 p = NULL;
489 }
490 }
1da177e4
LT		 491 }
492 return p;
493}
494
495static inline void nfs_writedata_free(struct nfs_write_data *p)
496{
40859d7e
CL		 497 if (p && (p->pagevec != &p->page_array[0]))
498 kfree(p->pagevec);
1da177e4
LT		 499 mempool_free(p, nfs_wdata_mempool);
500}
501
1da177e4
LT		 502/*
503 * linux/fs/nfs/read.c
504 */
505extern int nfs_readpage(struct file *, struct page *);
506extern int nfs_readpages(struct file *, struct address_space *,
507 struct list_head *, unsigned);
963d8fe5
TM		 508extern void nfs_readpage_result(struct rpc_task *, void *);
509extern void nfs_readdata_release(void *data);
510
1da177e4
LT		 511
512/*
513 * Allocate and free nfs_read_data structures
514 */
515extern mempool_t *nfs_rdata_mempool;
516
40859d7e 517static inline struct nfs_read_data *nfs_readdata_alloc(unsigned int pagecount)
1da177e4
LT		 518{
519 struct nfs_read_data *p = mempool_alloc(nfs_rdata_mempool, SLAB_NOFS);
40859d7e
CL		 520
521 if (p) {
1da177e4 522 memset(p, 0, sizeof(*p));
40859d7e
CL		 523 INIT_LIST_HEAD(&p->pages);
524 if (pagecount < NFS_PAGEVEC_SIZE)
525 p->pagevec = &p->page_array[0];
526 else {
527 size_t size = ++pagecount * sizeof(struct page *);
528 p->pagevec = kmalloc(size, GFP_NOFS);
529 if (p->pagevec) {
530 memset(p->pagevec, 0, size);
531 } else {
532 mempool_free(p, nfs_rdata_mempool);
533 p = NULL;
534 }
535 }
536 }
1da177e4
LT		 537 return p;
538}
539
540static inline void nfs_readdata_free(struct nfs_read_data *p)
541{
40859d7e
CL		 542 if (p && (p->pagevec != &p->page_array[0]))
543 kfree(p->pagevec);
1da177e4
LT		 544 mempool_free(p, nfs_rdata_mempool);
545}
546
b7fa0554
AG		 547/*
548 * linux/fs/nfs3proc.c
549 */
550#ifdef CONFIG_NFS_V3_ACL
551extern struct posix_acl *nfs3_proc_getacl(struct inode *inode, int type);
552extern int nfs3_proc_setacl(struct inode *inode, int type,
553 struct posix_acl *acl);
055ffbea
AG		 554extern int nfs3_proc_set_default_acl(struct inode *dir, struct inode *inode,
555 mode_t mode);
5c6a9f7d 556extern void nfs3_forget_cached_acls(struct inode *inode);
055ffbea
AG		 557#else
558static inline int nfs3_proc_set_default_acl(struct inode *dir,
559 struct inode *inode,
560 mode_t mode)
561{
562 return 0;
563}
5c6a9f7d
AG		 564
565static inline void nfs3_forget_cached_acls(struct inode *inode)
566{
567}
b7fa0554
AG		 568#endif /* CONFIG_NFS_V3_ACL */
569
1da177e4
LT		 570/*
571 * linux/fs/mount_clnt.c
572 * (Used only by nfsroot module)
573 */
574extern int nfsroot_mount(struct sockaddr_in *, char *, struct nfs_fh *,
575 int, int);
576
577/*
578 * inline functions
579 */
580
581static inline loff_t
582nfs_size_to_loff_t(__u64 size)
583{
584 loff_t maxsz = (((loff_t) ULONG_MAX) << PAGE_CACHE_SHIFT) + PAGE_CACHE_SIZE - 1;
585 if (size > maxsz)
586 return maxsz;
587 return (loff_t) size;
588}
589
590static inline ino_t
591nfs_fileid_to_ino_t(u64 fileid)
592{
593 ino_t ino = (ino_t) fileid;
594 if (sizeof(ino_t) < sizeof(u64))
595 ino ^= fileid >> (sizeof(u64)-sizeof(ino_t)) * 8;
596 return ino;
597}
598
599/* NFS root */
600
601extern void * nfs_root_data(void);
602
603#define nfs_wait_event(clnt, wq, condition) \
604({ \
605 int __retval = 0; \
606 if (clnt->cl_intr) { \
607 sigset_t oldmask; \
608 rpc_clnt_sigmask(clnt, &oldmask); \
609 __retval = wait_event_interruptible(wq, condition); \
610 rpc_clnt_sigunmask(clnt, &oldmask); \
611 } else \
612 wait_event(wq, condition); \
613 __retval; \
614})
615
616#define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
617
1da177e4
LT		 618#endif /* __KERNEL__ */
619
620/*
621 * NFS debug flags
622 */
623#define NFSDBG_VFS 0x0001
624#define NFSDBG_DIRCACHE 0x0002
625#define NFSDBG_LOOKUPCACHE 0x0004
626#define NFSDBG_PAGECACHE 0x0008
627#define NFSDBG_PROC 0x0010
628#define NFSDBG_XDR 0x0020
629#define NFSDBG_FILE 0x0040
630#define NFSDBG_ROOT 0x0080
631#define NFSDBG_CALLBACK 0x0100
632#define NFSDBG_ALL 0xFFFF
633
634#ifdef __KERNEL__
635# undef ifdebug
636# ifdef NFS_DEBUG
637# define ifdebug(fac) if (unlikely(nfs_debug & NFSDBG_##fac))
638# else
639# define ifdebug(fac) if (0)
640# endif
641#endif /* __KERNEL */
642
643#endif
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