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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
48struct readdir_cd {
49 __be32 err; /* 0, nfserr, or nfserr_eof */
50};
51
52
53extern struct svc_program nfsd_program;
54extern struct svc_version nfsd_version2, nfsd_version3,
55 nfsd_version4;
56extern u32 nfsd_supported_minorversion;
57extern struct mutex nfsd_mutex;
58extern struct svc_serv *nfsd_serv;
59extern spinlock_t nfsd_drc_lock;
60extern unsigned int nfsd_drc_max_mem;
61extern unsigned int nfsd_drc_mem_used;
62
63extern const struct seq_operations nfs_exports_op;
64
65/*
66 * Function prototypes.
67 */
68int nfsd_svc(unsigned short port, int nrservs);
69int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
70
71int nfsd_nrthreads(void);
72int nfsd_nrpools(void);
73int nfsd_get_nrthreads(int n, int *);
74int nfsd_set_nrthreads(int n, int *);
75
76static 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
89extern struct svc_version nfsd_acl_version2;
90#else
91#define nfsd_acl_version2 NULL
92#endif
93#ifdef CONFIG_NFSD_V3_ACL
94extern struct svc_version nfsd_acl_version3;
95#else
96#define nfsd_acl_version3 NULL
97#endif
98#endif
99
100enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
101int nfsd_vers(int vers, enum vers_op change);
102int nfsd_minorversion(u32 minorversion, enum vers_op change);
103void nfsd_reset_versions(void);
104int nfsd_create_serv(void);
105
106extern int nfsd_max_blksize;
107
108static 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
117extern unsigned int max_delegations;
118void nfs4_state_init(void);
119int nfsd4_init_slabs(void);
120void nfsd4_free_slabs(void);
121int nfs4_state_start(void);
122void nfs4_state_shutdown(void);
123void nfs4_reset_lease(time_t leasetime);
124int nfs4_reset_recoverydir(char *recdir);
125#else
126static inline void nfs4_state_init(void) { }
127static inline int nfsd4_init_slabs(void) { return 0; }
128static inline void nfsd4_free_slabs(void) { }
129static inline int nfs4_state_start(void) { return 0; }
130static inline void nfs4_state_shutdown(void) { }
131static inline void nfs4_reset_lease(time_t leasetime) { }
132static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
133#endif
134
135/*
136 * lockd binding
137 */
138void nfsd_lockd_init(void);
139void 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 */
267extern struct timeval nfssvc_boot;
268
269#ifdef CONFIG_NFSD_V4
270
271extern time_t nfsd4_lease;
272extern 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
335static inline u32 nfsd_suppattrs0(u32 minorversion)
336{
337 return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
338 : NFSD4_SUPPORTED_ATTRS_WORD0;
339}
340
341static inline u32 nfsd_suppattrs1(u32 minorversion)
342{
343 return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
344 : NFSD4_SUPPORTED_ATTRS_WORD1;
345}
346
347static 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
377extern int nfsd4_is_junction(struct dentry *dentry);
378extern int register_cld_notifier(void);
379extern void unregister_cld_notifier(void);
380#else /* CONFIG_NFSD_V4 */
381static 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 */
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Hodge-podge collection of knfsd-related stuff.
4 * I will sort this out later.
5 *
6 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
7 */
8
9#ifndef LINUX_NFSD_NFSD_H
10#define LINUX_NFSD_NFSD_H
11
12#include <linux/types.h>
13#include <linux/mount.h>
14
15#include <linux/nfs.h>
16#include <linux/nfs2.h>
17#include <linux/nfs3.h>
18#include <linux/nfs4.h>
19#include <linux/sunrpc/svc.h>
20#include <linux/sunrpc/svc_xprt.h>
21#include <linux/sunrpc/msg_prot.h>
22
23#include <uapi/linux/nfsd/debug.h>
24
25#include "netns.h"
26#include "stats.h"
27#include "export.h"
28
29#undef ifdebug
30#ifdef CONFIG_SUNRPC_DEBUG
31# define ifdebug(flag) if (nfsd_debug & NFSDDBG_##flag)
32#else
33# define ifdebug(flag) if (0)
34#endif
35
36/*
37 * nfsd version
38 */
39#define NFSD_SUPPORTED_MINOR_VERSION 2
40/*
41 * Maximum blocksizes supported by daemon under various circumstances.
42 */
43#define NFSSVC_MAXBLKSIZE RPCSVC_MAXPAYLOAD
44/* NFSv2 is limited by the protocol specification, see RFC 1094 */
45#define NFSSVC_MAXBLKSIZE_V2 (8*1024)
46
47
48/*
49 * Largest number of bytes we need to allocate for an NFS
50 * call or reply. Used to control buffer sizes. We use
51 * the length of v3 WRITE, READDIR and READDIR replies
52 * which are an RPC header, up to 26 XDR units of reply
53 * data, and some page data.
54 *
55 * Note that accuracy here doesn't matter too much as the
56 * size is rounded up to a page size when allocating space.
57 */
58#define NFSD_BUFSIZE ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
59
60struct readdir_cd {
61 __be32 err; /* 0, nfserr, or nfserr_eof */
62};
63
64
65extern struct svc_program nfsd_program;
66extern const struct svc_version nfsd_version2, nfsd_version3,
67 nfsd_version4;
68extern struct mutex nfsd_mutex;
69extern spinlock_t nfsd_drc_lock;
70extern unsigned long nfsd_drc_max_mem;
71extern unsigned long nfsd_drc_mem_used;
72
73extern const struct seq_operations nfs_exports_op;
74
75/*
76 * Function prototypes.
77 */
78int nfsd_svc(int nrservs, struct net *net, const struct cred *cred);
79int nfsd_dispatch(struct svc_rqst *rqstp, __be32 *statp);
80
81int nfsd_nrthreads(struct net *);
82int nfsd_nrpools(struct net *);
83int nfsd_get_nrthreads(int n, int *, struct net *);
84int nfsd_set_nrthreads(int n, int *, struct net *);
85int nfsd_pool_stats_open(struct inode *, struct file *);
86int nfsd_pool_stats_release(struct inode *, struct file *);
87
88void nfsd_destroy(struct net *net);
89
90struct nfsdfs_client {
91 struct kref cl_ref;
92 void (*cl_release)(struct kref *kref);
93};
94
95struct nfsdfs_client *get_nfsdfs_client(struct inode *);
96struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
97 struct nfsdfs_client *ncl, u32 id, const struct tree_descr *);
98void nfsd_client_rmdir(struct dentry *dentry);
99
100#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
101#ifdef CONFIG_NFSD_V2_ACL
102extern const struct svc_version nfsd_acl_version2;
103#else
104#define nfsd_acl_version2 NULL
105#endif
106#ifdef CONFIG_NFSD_V3_ACL
107extern const struct svc_version nfsd_acl_version3;
108#else
109#define nfsd_acl_version3 NULL
110#endif
111#endif
112
113struct nfsd_net;
114
115enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
116int nfsd_vers(struct nfsd_net *nn, int vers, enum vers_op change);
117int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change);
118void nfsd_reset_versions(struct nfsd_net *nn);
119int nfsd_create_serv(struct net *net);
120
121extern int nfsd_max_blksize;
122
123static inline int nfsd_v4client(struct svc_rqst *rq)
124{
125 return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
126}
127static inline struct user_namespace *
128nfsd_user_namespace(const struct svc_rqst *rqstp)
129{
130 const struct cred *cred = rqstp->rq_xprt->xpt_cred;
131 return cred ? cred->user_ns : &init_user_ns;
132}
133
134/*
135 * NFSv4 State
136 */
137#ifdef CONFIG_NFSD_V4
138extern unsigned long max_delegations;
139int nfsd4_init_slabs(void);
140void nfsd4_free_slabs(void);
141int nfs4_state_start(void);
142int nfs4_state_start_net(struct net *net);
143void nfs4_state_shutdown(void);
144void nfs4_state_shutdown_net(struct net *net);
145void nfs4_reset_lease(time_t leasetime);
146int nfs4_reset_recoverydir(char *recdir);
147char * nfs4_recoverydir(void);
148bool nfsd4_spo_must_allow(struct svc_rqst *rqstp);
149#else
150static inline int nfsd4_init_slabs(void) { return 0; }
151static inline void nfsd4_free_slabs(void) { }
152static inline int nfs4_state_start(void) { return 0; }
153static inline int nfs4_state_start_net(struct net *net) { return 0; }
154static inline void nfs4_state_shutdown(void) { }
155static inline void nfs4_state_shutdown_net(struct net *net) { }
156static inline void nfs4_reset_lease(time_t leasetime) { }
157static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
158static inline char * nfs4_recoverydir(void) {return NULL; }
159static inline bool nfsd4_spo_must_allow(struct svc_rqst *rqstp)
160{
161 return false;
162}
163#endif
164
165/*
166 * lockd binding
167 */
168void nfsd_lockd_init(void);
169void nfsd_lockd_shutdown(void);
170
171
172/*
173 * These macros provide pre-xdr'ed values for faster operation.
174 */
175#define nfs_ok cpu_to_be32(NFS_OK)
176#define nfserr_perm cpu_to_be32(NFSERR_PERM)
177#define nfserr_noent cpu_to_be32(NFSERR_NOENT)
178#define nfserr_io cpu_to_be32(NFSERR_IO)
179#define nfserr_nxio cpu_to_be32(NFSERR_NXIO)
180#define nfserr_eagain cpu_to_be32(NFSERR_EAGAIN)
181#define nfserr_acces cpu_to_be32(NFSERR_ACCES)
182#define nfserr_exist cpu_to_be32(NFSERR_EXIST)
183#define nfserr_xdev cpu_to_be32(NFSERR_XDEV)
184#define nfserr_nodev cpu_to_be32(NFSERR_NODEV)
185#define nfserr_notdir cpu_to_be32(NFSERR_NOTDIR)
186#define nfserr_isdir cpu_to_be32(NFSERR_ISDIR)
187#define nfserr_inval cpu_to_be32(NFSERR_INVAL)
188#define nfserr_fbig cpu_to_be32(NFSERR_FBIG)
189#define nfserr_nospc cpu_to_be32(NFSERR_NOSPC)
190#define nfserr_rofs cpu_to_be32(NFSERR_ROFS)
191#define nfserr_mlink cpu_to_be32(NFSERR_MLINK)
192#define nfserr_opnotsupp cpu_to_be32(NFSERR_OPNOTSUPP)
193#define nfserr_nametoolong cpu_to_be32(NFSERR_NAMETOOLONG)
194#define nfserr_notempty cpu_to_be32(NFSERR_NOTEMPTY)
195#define nfserr_dquot cpu_to_be32(NFSERR_DQUOT)
196#define nfserr_stale cpu_to_be32(NFSERR_STALE)
197#define nfserr_remote cpu_to_be32(NFSERR_REMOTE)
198#define nfserr_wflush cpu_to_be32(NFSERR_WFLUSH)
199#define nfserr_badhandle cpu_to_be32(NFSERR_BADHANDLE)
200#define nfserr_notsync cpu_to_be32(NFSERR_NOT_SYNC)
201#define nfserr_badcookie cpu_to_be32(NFSERR_BAD_COOKIE)
202#define nfserr_notsupp cpu_to_be32(NFSERR_NOTSUPP)
203#define nfserr_toosmall cpu_to_be32(NFSERR_TOOSMALL)
204#define nfserr_serverfault cpu_to_be32(NFSERR_SERVERFAULT)
205#define nfserr_badtype cpu_to_be32(NFSERR_BADTYPE)
206#define nfserr_jukebox cpu_to_be32(NFSERR_JUKEBOX)
207#define nfserr_denied cpu_to_be32(NFSERR_DENIED)
208#define nfserr_deadlock cpu_to_be32(NFSERR_DEADLOCK)
209#define nfserr_expired cpu_to_be32(NFSERR_EXPIRED)
210#define nfserr_bad_cookie cpu_to_be32(NFSERR_BAD_COOKIE)
211#define nfserr_same cpu_to_be32(NFSERR_SAME)
212#define nfserr_clid_inuse cpu_to_be32(NFSERR_CLID_INUSE)
213#define nfserr_stale_clientid cpu_to_be32(NFSERR_STALE_CLIENTID)
214#define nfserr_resource cpu_to_be32(NFSERR_RESOURCE)
215#define nfserr_moved cpu_to_be32(NFSERR_MOVED)
216#define nfserr_nofilehandle cpu_to_be32(NFSERR_NOFILEHANDLE)
217#define nfserr_minor_vers_mismatch cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
218#define nfserr_share_denied cpu_to_be32(NFSERR_SHARE_DENIED)
219#define nfserr_stale_stateid cpu_to_be32(NFSERR_STALE_STATEID)
220#define nfserr_old_stateid cpu_to_be32(NFSERR_OLD_STATEID)
221#define nfserr_bad_stateid cpu_to_be32(NFSERR_BAD_STATEID)
222#define nfserr_bad_seqid cpu_to_be32(NFSERR_BAD_SEQID)
223#define nfserr_symlink cpu_to_be32(NFSERR_SYMLINK)
224#define nfserr_not_same cpu_to_be32(NFSERR_NOT_SAME)
225#define nfserr_lock_range cpu_to_be32(NFSERR_LOCK_RANGE)
226#define nfserr_restorefh cpu_to_be32(NFSERR_RESTOREFH)
227#define nfserr_attrnotsupp cpu_to_be32(NFSERR_ATTRNOTSUPP)
228#define nfserr_bad_xdr cpu_to_be32(NFSERR_BAD_XDR)
229#define nfserr_openmode cpu_to_be32(NFSERR_OPENMODE)
230#define nfserr_badowner cpu_to_be32(NFSERR_BADOWNER)
231#define nfserr_locks_held cpu_to_be32(NFSERR_LOCKS_HELD)
232#define nfserr_op_illegal cpu_to_be32(NFSERR_OP_ILLEGAL)
233#define nfserr_grace cpu_to_be32(NFSERR_GRACE)
234#define nfserr_no_grace cpu_to_be32(NFSERR_NO_GRACE)
235#define nfserr_reclaim_bad cpu_to_be32(NFSERR_RECLAIM_BAD)
236#define nfserr_badname cpu_to_be32(NFSERR_BADNAME)
237#define nfserr_cb_path_down cpu_to_be32(NFSERR_CB_PATH_DOWN)
238#define nfserr_locked cpu_to_be32(NFSERR_LOCKED)
239#define nfserr_wrongsec cpu_to_be32(NFSERR_WRONGSEC)
240#define nfserr_badiomode cpu_to_be32(NFS4ERR_BADIOMODE)
241#define nfserr_badlayout cpu_to_be32(NFS4ERR_BADLAYOUT)
242#define nfserr_bad_session_digest cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
243#define nfserr_badsession cpu_to_be32(NFS4ERR_BADSESSION)
244#define nfserr_badslot cpu_to_be32(NFS4ERR_BADSLOT)
245#define nfserr_complete_already cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
246#define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
247#define nfserr_deleg_already_wanted cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
248#define nfserr_back_chan_busy cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
249#define nfserr_layouttrylater cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
250#define nfserr_layoutunavailable cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
251#define nfserr_nomatching_layout cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
252#define nfserr_recallconflict cpu_to_be32(NFS4ERR_RECALLCONFLICT)
253#define nfserr_unknown_layouttype cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
254#define nfserr_seq_misordered cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
255#define nfserr_sequence_pos cpu_to_be32(NFS4ERR_SEQUENCE_POS)
256#define nfserr_req_too_big cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
257#define nfserr_rep_too_big cpu_to_be32(NFS4ERR_REP_TOO_BIG)
258#define nfserr_rep_too_big_to_cache cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
259#define nfserr_retry_uncached_rep cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
260#define nfserr_unsafe_compound cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
261#define nfserr_too_many_ops cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
262#define nfserr_op_not_in_session cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
263#define nfserr_hash_alg_unsupp cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
264#define nfserr_clientid_busy cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
265#define nfserr_pnfs_io_hole cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
266#define nfserr_seq_false_retry cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
267#define nfserr_bad_high_slot cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
268#define nfserr_deadsession cpu_to_be32(NFS4ERR_DEADSESSION)
269#define nfserr_encr_alg_unsupp cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
270#define nfserr_pnfs_no_layout cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
271#define nfserr_not_only_op cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
272#define nfserr_wrong_cred cpu_to_be32(NFS4ERR_WRONG_CRED)
273#define nfserr_wrong_type cpu_to_be32(NFS4ERR_WRONG_TYPE)
274#define nfserr_dirdeleg_unavail cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
275#define nfserr_reject_deleg cpu_to_be32(NFS4ERR_REJECT_DELEG)
276#define nfserr_returnconflict cpu_to_be32(NFS4ERR_RETURNCONFLICT)
277#define nfserr_deleg_revoked cpu_to_be32(NFS4ERR_DELEG_REVOKED)
278#define nfserr_partner_notsupp cpu_to_be32(NFS4ERR_PARTNER_NOTSUPP)
279#define nfserr_partner_no_auth cpu_to_be32(NFS4ERR_PARTNER_NO_AUTH)
280#define nfserr_union_notsupp cpu_to_be32(NFS4ERR_UNION_NOTSUPP)
281#define nfserr_offload_denied cpu_to_be32(NFS4ERR_OFFLOAD_DENIED)
282#define nfserr_wrong_lfs cpu_to_be32(NFS4ERR_WRONG_LFS)
283#define nfserr_badlabel cpu_to_be32(NFS4ERR_BADLABEL)
284
285/* error codes for internal use */
286/* if a request fails due to kmalloc failure, it gets dropped.
287 * Client should resend eventually
288 */
289#define nfserr_dropit cpu_to_be32(30000)
290/* end-of-file indicator in readdir */
291#define nfserr_eof cpu_to_be32(30001)
292/* replay detected */
293#define nfserr_replay_me cpu_to_be32(11001)
294/* nfs41 replay detected */
295#define nfserr_replay_cache cpu_to_be32(11002)
296
297/* Check for dir entries '.' and '..' */
298#define isdotent(n, l) (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
299
300#ifdef CONFIG_NFSD_V4
301
302/* before processing a COMPOUND operation, we have to check that there
303 * is enough space in the buffer for XDR encode to succeed. otherwise,
304 * we might process an operation with side effects, and be unable to
305 * tell the client that the operation succeeded.
306 *
307 * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
308 * needed to encode an "ordinary" _successful_ operation. (GETATTR,
309 * READ, READDIR, and READLINK have their own buffer checks.) if we
310 * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
311 *
312 * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
313 * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
314 * care is taken to ensure that we never fall below this level for any
315 * reason.
316 */
317#define COMPOUND_SLACK_SPACE 140 /* OP_GETFH */
318#define COMPOUND_ERR_SLACK_SPACE 16 /* OP_SETATTR */
319
320#define NFSD_LAUNDROMAT_MINTIMEOUT 1 /* seconds */
321
322/*
323 * The following attributes are currently not supported by the NFSv4 server:
324 * ARCHIVE (deprecated anyway)
325 * HIDDEN (unlikely to be supported any time soon)
326 * MIMETYPE (unlikely to be supported any time soon)
327 * QUOTA_* (will be supported in a forthcoming patch)
328 * SYSTEM (unlikely to be supported any time soon)
329 * TIME_BACKUP (unlikely to be supported any time soon)
330 * TIME_CREATE (unlikely to be supported any time soon)
331 */
332#define NFSD4_SUPPORTED_ATTRS_WORD0 \
333(FATTR4_WORD0_SUPPORTED_ATTRS | FATTR4_WORD0_TYPE | FATTR4_WORD0_FH_EXPIRE_TYPE \
334 | FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE | FATTR4_WORD0_LINK_SUPPORT \
335 | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR | FATTR4_WORD0_FSID \
336 | FATTR4_WORD0_UNIQUE_HANDLES | FATTR4_WORD0_LEASE_TIME | FATTR4_WORD0_RDATTR_ERROR \
337 | FATTR4_WORD0_ACLSUPPORT | FATTR4_WORD0_CANSETTIME | FATTR4_WORD0_CASE_INSENSITIVE \
338 | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED \
339 | FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FILEID | FATTR4_WORD0_FILES_AVAIL \
340 | FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS \
341 | FATTR4_WORD0_MAXFILESIZE | FATTR4_WORD0_MAXLINK | FATTR4_WORD0_MAXNAME \
342 | FATTR4_WORD0_MAXREAD | FATTR4_WORD0_MAXWRITE | FATTR4_WORD0_ACL)
343
344#define NFSD4_SUPPORTED_ATTRS_WORD1 \
345(FATTR4_WORD1_MODE | FATTR4_WORD1_NO_TRUNC | FATTR4_WORD1_NUMLINKS \
346 | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP | FATTR4_WORD1_RAWDEV \
347 | FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE | FATTR4_WORD1_SPACE_TOTAL \
348 | FATTR4_WORD1_SPACE_USED | FATTR4_WORD1_TIME_ACCESS | FATTR4_WORD1_TIME_ACCESS_SET \
349 | FATTR4_WORD1_TIME_DELTA | FATTR4_WORD1_TIME_METADATA \
350 | FATTR4_WORD1_TIME_MODIFY | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
351
352#define NFSD4_SUPPORTED_ATTRS_WORD2 0
353
354/* 4.1 */
355#ifdef CONFIG_NFSD_PNFS
356#define PNFSD_SUPPORTED_ATTRS_WORD1 FATTR4_WORD1_FS_LAYOUT_TYPES
357#define PNFSD_SUPPORTED_ATTRS_WORD2 \
358(FATTR4_WORD2_LAYOUT_BLKSIZE | FATTR4_WORD2_LAYOUT_TYPES)
359#else
360#define PNFSD_SUPPORTED_ATTRS_WORD1 0
361#define PNFSD_SUPPORTED_ATTRS_WORD2 0
362#endif /* CONFIG_NFSD_PNFS */
363
364#define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
365 NFSD4_SUPPORTED_ATTRS_WORD0
366
367#define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
368 (NFSD4_SUPPORTED_ATTRS_WORD1 | PNFSD_SUPPORTED_ATTRS_WORD1)
369
370#define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
371 (NFSD4_SUPPORTED_ATTRS_WORD2 | PNFSD_SUPPORTED_ATTRS_WORD2 | \
372 FATTR4_WORD2_SUPPATTR_EXCLCREAT)
373
374/* 4.2 */
375#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
376#define NFSD4_2_SECURITY_ATTRS FATTR4_WORD2_SECURITY_LABEL
377#else
378#define NFSD4_2_SECURITY_ATTRS 0
379#endif
380
381#define NFSD4_2_SUPPORTED_ATTRS_WORD2 \
382 (NFSD4_1_SUPPORTED_ATTRS_WORD2 | \
383 FATTR4_WORD2_CHANGE_ATTR_TYPE | \
384 FATTR4_WORD2_MODE_UMASK | \
385 NFSD4_2_SECURITY_ATTRS)
386
387extern const u32 nfsd_suppattrs[3][3];
388
389static inline bool bmval_is_subset(const u32 *bm1, const u32 *bm2)
390{
391 return !((bm1[0] & ~bm2[0]) ||
392 (bm1[1] & ~bm2[1]) ||
393 (bm1[2] & ~bm2[2]));
394}
395
396static inline bool nfsd_attrs_supported(u32 minorversion, const u32 *bmval)
397{
398 return bmval_is_subset(bmval, nfsd_suppattrs[minorversion]);
399}
400
401/* These will return ERR_INVAL if specified in GETATTR or READDIR. */
402#define NFSD_WRITEONLY_ATTRS_WORD1 \
403 (FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
404
405/*
406 * These are the only attrs allowed in CREATE/OPEN/SETATTR. Don't add
407 * a writeable attribute here without also adding code to parse it to
408 * nfsd4_decode_fattr().
409 */
410#define NFSD_WRITEABLE_ATTRS_WORD0 \
411 (FATTR4_WORD0_SIZE | FATTR4_WORD0_ACL)
412#define NFSD_WRITEABLE_ATTRS_WORD1 \
413 (FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP \
414 | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
415#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
416#define MAYBE_FATTR4_WORD2_SECURITY_LABEL \
417 FATTR4_WORD2_SECURITY_LABEL
418#else
419#define MAYBE_FATTR4_WORD2_SECURITY_LABEL 0
420#endif
421#define NFSD_WRITEABLE_ATTRS_WORD2 \
422 (FATTR4_WORD2_MODE_UMASK \
423 | MAYBE_FATTR4_WORD2_SECURITY_LABEL)
424
425#define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
426 NFSD_WRITEABLE_ATTRS_WORD0
427/*
428 * we currently store the exclusive create verifier in the v_{a,m}time
429 * attributes so the client can't set these at create time using EXCLUSIVE4_1
430 */
431#define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
432 (NFSD_WRITEABLE_ATTRS_WORD1 & \
433 ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
434#define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
435 NFSD_WRITEABLE_ATTRS_WORD2
436
437extern int nfsd4_is_junction(struct dentry *dentry);
438extern int register_cld_notifier(void);
439extern void unregister_cld_notifier(void);
440#else /* CONFIG_NFSD_V4 */
441static inline int nfsd4_is_junction(struct dentry *dentry)
442{
443 return 0;
444}
445
446#define register_cld_notifier() 0
447#define unregister_cld_notifier() do { } while(0)
448
449#endif /* CONFIG_NFSD_V4 */
450
451#endif /* LINUX_NFSD_NFSD_H */