1 /*
2  * Hodge-podge collection of knfsd-related stuff.
3  * I will sort this out later.
4  *
5  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
6  */
7 
8 #ifndef LINUX_NFSD_NFSD_H
9 #define LINUX_NFSD_NFSD_H
10 
11 #include <linux/types.h>
12 #include <linux/mount.h>
13 
14 #include <linux/nfs.h>
15 #include <linux/nfs2.h>
16 #include <linux/nfs3.h>
17 #include <linux/nfs4.h>
18 #include <linux/sunrpc/msg_prot.h>
19 
20 #include <linux/nfsd/debug.h>
21 #include <linux/nfsd/export.h>
22 #include <linux/nfsd/stats.h>
23 
24 /*
25  * nfsd version
26  */
27 #define NFSD_SUPPORTED_MINOR_VERSION	1
28 /*
29  * Maximum blocksizes supported by daemon under various circumstances.
30  */
31 #define NFSSVC_MAXBLKSIZE       RPCSVC_MAXPAYLOAD
32 /* NFSv2 is limited by the protocol specification, see RFC 1094 */
33 #define NFSSVC_MAXBLKSIZE_V2    (8*1024)
34 
35 
36 /*
37  * Largest number of bytes we need to allocate for an NFS
38  * call or reply.  Used to control buffer sizes.  We use
39  * the length of v3 WRITE, READDIR and READDIR replies
40  * which are an RPC header, up to 26 XDR units of reply
41  * data, and some page data.
42  *
43  * Note that accuracy here doesn't matter too much as the
44  * size is rounded up to a page size when allocating space.
45  */
46 #define NFSD_BUFSIZE            ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
47 
48 struct readdir_cd {
49 	__be32			err;	/* 0, nfserr, or nfserr_eof */
50 };
51 
52 
53 extern struct svc_program	nfsd_program;
54 extern struct svc_version	nfsd_version2, nfsd_version3,
55 				nfsd_version4;
56 extern u32			nfsd_supported_minorversion;
57 extern struct mutex		nfsd_mutex;
58 extern struct svc_serv		*nfsd_serv;
59 extern spinlock_t		nfsd_drc_lock;
60 extern unsigned int		nfsd_drc_max_mem;
61 extern unsigned int		nfsd_drc_mem_used;
62 
63 extern const struct seq_operations nfs_exports_op;
64 
65 /*
66  * Function prototypes.
67  */
68 int		nfsd_svc(unsigned short port, int nrservs, struct net *net);
69 int		nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
70 
71 int		nfsd_nrthreads(void);
72 int		nfsd_nrpools(void);
73 int		nfsd_get_nrthreads(int n, int *);
74 int		nfsd_set_nrthreads(int n, int *, struct net *);
75 
nfsd_destroy(struct net * net)76 static inline void nfsd_destroy(struct net *net)
77 {
78 	int destroy = (nfsd_serv->sv_nrthreads == 1);
79 
80 	if (destroy)
81 		svc_shutdown_net(nfsd_serv, net);
82 	svc_destroy(nfsd_serv);
83 	if (destroy)
84 		nfsd_serv = NULL;
85 }
86 
87 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
88 #ifdef CONFIG_NFSD_V2_ACL
89 extern struct svc_version nfsd_acl_version2;
90 #else
91 #define nfsd_acl_version2 NULL
92 #endif
93 #ifdef CONFIG_NFSD_V3_ACL
94 extern struct svc_version nfsd_acl_version3;
95 #else
96 #define nfsd_acl_version3 NULL
97 #endif
98 #endif
99 
100 enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
101 int nfsd_vers(int vers, enum vers_op change);
102 int nfsd_minorversion(u32 minorversion, enum vers_op change);
103 void nfsd_reset_versions(void);
104 int nfsd_create_serv(struct net *net);
105 
106 extern int nfsd_max_blksize;
107 
nfsd_v4client(struct svc_rqst * rq)108 static inline int nfsd_v4client(struct svc_rqst *rq)
109 {
110 	return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
111 }
112 
113 /*
114  * NFSv4 State
115  */
116 #ifdef CONFIG_NFSD_V4
117 extern unsigned int max_delegations;
118 void nfs4_state_init(void);
119 int nfsd4_init_slabs(void);
120 void nfsd4_free_slabs(void);
121 int nfs4_state_start(void);
122 void nfs4_state_shutdown(void);
123 void nfs4_reset_lease(time_t leasetime);
124 int nfs4_reset_recoverydir(char *recdir);
125 #else
nfs4_state_init(void)126 static inline void nfs4_state_init(void) { }
nfsd4_init_slabs(void)127 static inline int nfsd4_init_slabs(void) { return 0; }
nfsd4_free_slabs(void)128 static inline void nfsd4_free_slabs(void) { }
nfs4_state_start(void)129 static inline int nfs4_state_start(void) { return 0; }
nfs4_state_shutdown(void)130 static inline void nfs4_state_shutdown(void) { }
nfs4_reset_lease(time_t leasetime)131 static inline void nfs4_reset_lease(time_t leasetime) { }
nfs4_reset_recoverydir(char * recdir)132 static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
133 #endif
134 
135 /*
136  * lockd binding
137  */
138 void		nfsd_lockd_init(void);
139 void		nfsd_lockd_shutdown(void);
140 
141 
142 /*
143  * These macros provide pre-xdr'ed values for faster operation.
144  */
145 #define	nfs_ok			cpu_to_be32(NFS_OK)
146 #define	nfserr_perm		cpu_to_be32(NFSERR_PERM)
147 #define	nfserr_noent		cpu_to_be32(NFSERR_NOENT)
148 #define	nfserr_io		cpu_to_be32(NFSERR_IO)
149 #define	nfserr_nxio		cpu_to_be32(NFSERR_NXIO)
150 #define	nfserr_eagain		cpu_to_be32(NFSERR_EAGAIN)
151 #define	nfserr_acces		cpu_to_be32(NFSERR_ACCES)
152 #define	nfserr_exist		cpu_to_be32(NFSERR_EXIST)
153 #define	nfserr_xdev		cpu_to_be32(NFSERR_XDEV)
154 #define	nfserr_nodev		cpu_to_be32(NFSERR_NODEV)
155 #define	nfserr_notdir		cpu_to_be32(NFSERR_NOTDIR)
156 #define	nfserr_isdir		cpu_to_be32(NFSERR_ISDIR)
157 #define	nfserr_inval		cpu_to_be32(NFSERR_INVAL)
158 #define	nfserr_fbig		cpu_to_be32(NFSERR_FBIG)
159 #define	nfserr_nospc		cpu_to_be32(NFSERR_NOSPC)
160 #define	nfserr_rofs		cpu_to_be32(NFSERR_ROFS)
161 #define	nfserr_mlink		cpu_to_be32(NFSERR_MLINK)
162 #define	nfserr_opnotsupp	cpu_to_be32(NFSERR_OPNOTSUPP)
163 #define	nfserr_nametoolong	cpu_to_be32(NFSERR_NAMETOOLONG)
164 #define	nfserr_notempty		cpu_to_be32(NFSERR_NOTEMPTY)
165 #define	nfserr_dquot		cpu_to_be32(NFSERR_DQUOT)
166 #define	nfserr_stale		cpu_to_be32(NFSERR_STALE)
167 #define	nfserr_remote		cpu_to_be32(NFSERR_REMOTE)
168 #define	nfserr_wflush		cpu_to_be32(NFSERR_WFLUSH)
169 #define	nfserr_badhandle	cpu_to_be32(NFSERR_BADHANDLE)
170 #define	nfserr_notsync		cpu_to_be32(NFSERR_NOT_SYNC)
171 #define	nfserr_badcookie	cpu_to_be32(NFSERR_BAD_COOKIE)
172 #define	nfserr_notsupp		cpu_to_be32(NFSERR_NOTSUPP)
173 #define	nfserr_toosmall		cpu_to_be32(NFSERR_TOOSMALL)
174 #define	nfserr_serverfault	cpu_to_be32(NFSERR_SERVERFAULT)
175 #define	nfserr_badtype		cpu_to_be32(NFSERR_BADTYPE)
176 #define	nfserr_jukebox		cpu_to_be32(NFSERR_JUKEBOX)
177 #define	nfserr_denied		cpu_to_be32(NFSERR_DENIED)
178 #define	nfserr_deadlock		cpu_to_be32(NFSERR_DEADLOCK)
179 #define nfserr_expired          cpu_to_be32(NFSERR_EXPIRED)
180 #define	nfserr_bad_cookie	cpu_to_be32(NFSERR_BAD_COOKIE)
181 #define	nfserr_same		cpu_to_be32(NFSERR_SAME)
182 #define	nfserr_clid_inuse	cpu_to_be32(NFSERR_CLID_INUSE)
183 #define	nfserr_stale_clientid	cpu_to_be32(NFSERR_STALE_CLIENTID)
184 #define	nfserr_resource		cpu_to_be32(NFSERR_RESOURCE)
185 #define	nfserr_moved		cpu_to_be32(NFSERR_MOVED)
186 #define	nfserr_nofilehandle	cpu_to_be32(NFSERR_NOFILEHANDLE)
187 #define	nfserr_minor_vers_mismatch	cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
188 #define nfserr_share_denied	cpu_to_be32(NFSERR_SHARE_DENIED)
189 #define nfserr_stale_stateid	cpu_to_be32(NFSERR_STALE_STATEID)
190 #define nfserr_old_stateid	cpu_to_be32(NFSERR_OLD_STATEID)
191 #define nfserr_bad_stateid	cpu_to_be32(NFSERR_BAD_STATEID)
192 #define nfserr_bad_seqid	cpu_to_be32(NFSERR_BAD_SEQID)
193 #define	nfserr_symlink		cpu_to_be32(NFSERR_SYMLINK)
194 #define	nfserr_not_same		cpu_to_be32(NFSERR_NOT_SAME)
195 #define nfserr_lock_range	cpu_to_be32(NFSERR_LOCK_RANGE)
196 #define	nfserr_restorefh	cpu_to_be32(NFSERR_RESTOREFH)
197 #define	nfserr_attrnotsupp	cpu_to_be32(NFSERR_ATTRNOTSUPP)
198 #define	nfserr_bad_xdr		cpu_to_be32(NFSERR_BAD_XDR)
199 #define	nfserr_openmode		cpu_to_be32(NFSERR_OPENMODE)
200 #define	nfserr_badowner		cpu_to_be32(NFSERR_BADOWNER)
201 #define	nfserr_locks_held	cpu_to_be32(NFSERR_LOCKS_HELD)
202 #define	nfserr_op_illegal	cpu_to_be32(NFSERR_OP_ILLEGAL)
203 #define	nfserr_grace		cpu_to_be32(NFSERR_GRACE)
204 #define	nfserr_no_grace		cpu_to_be32(NFSERR_NO_GRACE)
205 #define	nfserr_reclaim_bad	cpu_to_be32(NFSERR_RECLAIM_BAD)
206 #define	nfserr_badname		cpu_to_be32(NFSERR_BADNAME)
207 #define	nfserr_cb_path_down	cpu_to_be32(NFSERR_CB_PATH_DOWN)
208 #define	nfserr_locked		cpu_to_be32(NFSERR_LOCKED)
209 #define	nfserr_wrongsec		cpu_to_be32(NFSERR_WRONGSEC)
210 #define nfserr_badiomode		cpu_to_be32(NFS4ERR_BADIOMODE)
211 #define nfserr_badlayout		cpu_to_be32(NFS4ERR_BADLAYOUT)
212 #define nfserr_bad_session_digest	cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
213 #define nfserr_badsession		cpu_to_be32(NFS4ERR_BADSESSION)
214 #define nfserr_badslot			cpu_to_be32(NFS4ERR_BADSLOT)
215 #define nfserr_complete_already		cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
216 #define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
217 #define nfserr_deleg_already_wanted	cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
218 #define nfserr_back_chan_busy		cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
219 #define nfserr_layouttrylater		cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
220 #define nfserr_layoutunavailable	cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
221 #define nfserr_nomatching_layout	cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
222 #define nfserr_recallconflict		cpu_to_be32(NFS4ERR_RECALLCONFLICT)
223 #define nfserr_unknown_layouttype	cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
224 #define nfserr_seq_misordered		cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
225 #define nfserr_sequence_pos		cpu_to_be32(NFS4ERR_SEQUENCE_POS)
226 #define nfserr_req_too_big		cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
227 #define nfserr_rep_too_big		cpu_to_be32(NFS4ERR_REP_TOO_BIG)
228 #define nfserr_rep_too_big_to_cache	cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
229 #define nfserr_retry_uncached_rep	cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
230 #define nfserr_unsafe_compound		cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
231 #define nfserr_too_many_ops		cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
232 #define nfserr_op_not_in_session	cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
233 #define nfserr_hash_alg_unsupp		cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
234 #define nfserr_clientid_busy		cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
235 #define nfserr_pnfs_io_hole		cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
236 #define nfserr_seq_false_retry		cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
237 #define nfserr_bad_high_slot		cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
238 #define nfserr_deadsession		cpu_to_be32(NFS4ERR_DEADSESSION)
239 #define nfserr_encr_alg_unsupp		cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
240 #define nfserr_pnfs_no_layout		cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
241 #define nfserr_not_only_op		cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
242 #define nfserr_wrong_cred		cpu_to_be32(NFS4ERR_WRONG_CRED)
243 #define nfserr_wrong_type		cpu_to_be32(NFS4ERR_WRONG_TYPE)
244 #define nfserr_dirdeleg_unavail		cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
245 #define nfserr_reject_deleg		cpu_to_be32(NFS4ERR_REJECT_DELEG)
246 #define nfserr_returnconflict		cpu_to_be32(NFS4ERR_RETURNCONFLICT)
247 #define nfserr_deleg_revoked		cpu_to_be32(NFS4ERR_DELEG_REVOKED)
248 
249 /* error codes for internal use */
250 /* if a request fails due to kmalloc failure, it gets dropped.
251  *  Client should resend eventually
252  */
253 #define	nfserr_dropit		cpu_to_be32(30000)
254 /* end-of-file indicator in readdir */
255 #define	nfserr_eof		cpu_to_be32(30001)
256 /* replay detected */
257 #define	nfserr_replay_me	cpu_to_be32(11001)
258 /* nfs41 replay detected */
259 #define	nfserr_replay_cache	cpu_to_be32(11002)
260 
261 /* Check for dir entries '.' and '..' */
262 #define isdotent(n, l)	(l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
263 
264 /*
265  * Time of server startup
266  */
267 extern struct timeval	nfssvc_boot;
268 
269 #ifdef CONFIG_NFSD_V4
270 
271 extern time_t nfsd4_lease;
272 extern time_t nfsd4_grace;
273 
274 /* before processing a COMPOUND operation, we have to check that there
275  * is enough space in the buffer for XDR encode to succeed.  otherwise,
276  * we might process an operation with side effects, and be unable to
277  * tell the client that the operation succeeded.
278  *
279  * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
280  * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
281  * READ, READDIR, and READLINK have their own buffer checks.)  if we
282  * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
283  *
284  * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
285  * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
286  * care is taken to ensure that we never fall below this level for any
287  * reason.
288  */
289 #define	COMPOUND_SLACK_SPACE		140    /* OP_GETFH */
290 #define COMPOUND_ERR_SLACK_SPACE	12     /* OP_SETATTR */
291 
292 #define NFSD_LAUNDROMAT_MINTIMEOUT      1   /* seconds */
293 
294 /*
295  * The following attributes are currently not supported by the NFSv4 server:
296  *    ARCHIVE       (deprecated anyway)
297  *    HIDDEN        (unlikely to be supported any time soon)
298  *    MIMETYPE      (unlikely to be supported any time soon)
299  *    QUOTA_*       (will be supported in a forthcoming patch)
300  *    SYSTEM        (unlikely to be supported any time soon)
301  *    TIME_BACKUP   (unlikely to be supported any time soon)
302  *    TIME_CREATE   (unlikely to be supported any time soon)
303  */
304 #define NFSD4_SUPPORTED_ATTRS_WORD0                                                         \
305 (FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
306  | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
307  | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
308  | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
309  | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
310  | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
311  | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
312  | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS      \
313  | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
314  | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE     | FATTR4_WORD0_ACL)
315 
316 #define NFSD4_SUPPORTED_ATTRS_WORD1                                                         \
317 (FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
318  | FATTR4_WORD1_OWNER	        | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
319  | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
320  | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
321  | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
322  | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
323 
324 #define NFSD4_SUPPORTED_ATTRS_WORD2 0
325 
326 #define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
327 	NFSD4_SUPPORTED_ATTRS_WORD0
328 
329 #define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
330 	NFSD4_SUPPORTED_ATTRS_WORD1
331 
332 #define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
333 	(NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
334 
nfsd_suppattrs0(u32 minorversion)335 static inline u32 nfsd_suppattrs0(u32 minorversion)
336 {
337 	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
338 			    : NFSD4_SUPPORTED_ATTRS_WORD0;
339 }
340 
nfsd_suppattrs1(u32 minorversion)341 static inline u32 nfsd_suppattrs1(u32 minorversion)
342 {
343 	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
344 			    : NFSD4_SUPPORTED_ATTRS_WORD1;
345 }
346 
nfsd_suppattrs2(u32 minorversion)347 static inline u32 nfsd_suppattrs2(u32 minorversion)
348 {
349 	return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD2
350 			    : NFSD4_SUPPORTED_ATTRS_WORD2;
351 }
352 
353 /* These will return ERR_INVAL if specified in GETATTR or READDIR. */
354 #define NFSD_WRITEONLY_ATTRS_WORD1 \
355 	(FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)
356 
357 /* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
358 #define NFSD_WRITEABLE_ATTRS_WORD0 \
359 	(FATTR4_WORD0_SIZE | FATTR4_WORD0_ACL)
360 #define NFSD_WRITEABLE_ATTRS_WORD1 \
361 	(FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP \
362 	| FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
363 #define NFSD_WRITEABLE_ATTRS_WORD2 0
364 
365 #define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
366 	NFSD_WRITEABLE_ATTRS_WORD0
367 /*
368  * we currently store the exclusive create verifier in the v_{a,m}time
369  * attributes so the client can't set these at create time using EXCLUSIVE4_1
370  */
371 #define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
372 	(NFSD_WRITEABLE_ATTRS_WORD1 & \
373 	 ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
374 #define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
375 	NFSD_WRITEABLE_ATTRS_WORD2
376 
377 extern int nfsd4_is_junction(struct dentry *dentry);
378 extern int register_cld_notifier(void);
379 extern void unregister_cld_notifier(void);
380 #else /* CONFIG_NFSD_V4 */
nfsd4_is_junction(struct dentry * dentry)381 static inline int nfsd4_is_junction(struct dentry *dentry)
382 {
383 	return 0;
384 }
385 
386 #define register_cld_notifier() 0
387 #define unregister_cld_notifier() do { } while(0)
388 
389 #endif /* CONFIG_NFSD_V4 */
390 
391 #endif /* LINUX_NFSD_NFSD_H */
392