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TOMOYO Linux Cross Reference
Linux/fs/nfsd/nfsd.h

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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 
 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);
 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 *);
 75 
 76 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
 77 #ifdef CONFIG_NFSD_V2_ACL
 78 extern struct svc_version nfsd_acl_version2;
 79 #else
 80 #define nfsd_acl_version2 NULL
 81 #endif
 82 #ifdef CONFIG_NFSD_V3_ACL
 83 extern struct svc_version nfsd_acl_version3;
 84 #else
 85 #define nfsd_acl_version3 NULL
 86 #endif
 87 #endif
 88 
 89 enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };
 90 int nfsd_vers(int vers, enum vers_op change);
 91 int nfsd_minorversion(u32 minorversion, enum vers_op change);
 92 void nfsd_reset_versions(void);
 93 int nfsd_create_serv(void);
 94 
 95 extern int nfsd_max_blksize;
 96 
 97 static inline int nfsd_v4client(struct svc_rqst *rq)
 98 {
 99         return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
100 }
101 
102 /* 
103  * NFSv4 State
104  */
105 #ifdef CONFIG_NFSD_V4
106 extern unsigned int max_delegations;
107 int nfs4_state_init(void);
108 void nfsd4_free_slabs(void);
109 int nfs4_state_start(void);
110 void nfs4_state_shutdown(void);
111 void nfs4_reset_lease(time_t leasetime);
112 int nfs4_reset_recoverydir(char *recdir);
113 #else
114 static inline int nfs4_state_init(void) { return 0; }
115 static inline void nfsd4_free_slabs(void) { }
116 static inline int nfs4_state_start(void) { return 0; }
117 static inline void nfs4_state_shutdown(void) { }
118 static inline void nfs4_reset_lease(time_t leasetime) { }
119 static inline int nfs4_reset_recoverydir(char *recdir) { return 0; }
120 #endif
121 
122 /*
123  * lockd binding
124  */
125 void            nfsd_lockd_init(void);
126 void            nfsd_lockd_shutdown(void);
127 
128 
129 /*
130  * These macros provide pre-xdr'ed values for faster operation.
131  */
132 #define nfs_ok                  cpu_to_be32(NFS_OK)
133 #define nfserr_perm             cpu_to_be32(NFSERR_PERM)
134 #define nfserr_noent            cpu_to_be32(NFSERR_NOENT)
135 #define nfserr_io               cpu_to_be32(NFSERR_IO)
136 #define nfserr_nxio             cpu_to_be32(NFSERR_NXIO)
137 #define nfserr_eagain           cpu_to_be32(NFSERR_EAGAIN)
138 #define nfserr_acces            cpu_to_be32(NFSERR_ACCES)
139 #define nfserr_exist            cpu_to_be32(NFSERR_EXIST)
140 #define nfserr_xdev             cpu_to_be32(NFSERR_XDEV)
141 #define nfserr_nodev            cpu_to_be32(NFSERR_NODEV)
142 #define nfserr_notdir           cpu_to_be32(NFSERR_NOTDIR)
143 #define nfserr_isdir            cpu_to_be32(NFSERR_ISDIR)
144 #define nfserr_inval            cpu_to_be32(NFSERR_INVAL)
145 #define nfserr_fbig             cpu_to_be32(NFSERR_FBIG)
146 #define nfserr_nospc            cpu_to_be32(NFSERR_NOSPC)
147 #define nfserr_rofs             cpu_to_be32(NFSERR_ROFS)
148 #define nfserr_mlink            cpu_to_be32(NFSERR_MLINK)
149 #define nfserr_opnotsupp        cpu_to_be32(NFSERR_OPNOTSUPP)
150 #define nfserr_nametoolong      cpu_to_be32(NFSERR_NAMETOOLONG)
151 #define nfserr_notempty         cpu_to_be32(NFSERR_NOTEMPTY)
152 #define nfserr_dquot            cpu_to_be32(NFSERR_DQUOT)
153 #define nfserr_stale            cpu_to_be32(NFSERR_STALE)
154 #define nfserr_remote           cpu_to_be32(NFSERR_REMOTE)
155 #define nfserr_wflush           cpu_to_be32(NFSERR_WFLUSH)
156 #define nfserr_badhandle        cpu_to_be32(NFSERR_BADHANDLE)
157 #define nfserr_notsync          cpu_to_be32(NFSERR_NOT_SYNC)
158 #define nfserr_badcookie        cpu_to_be32(NFSERR_BAD_COOKIE)
159 #define nfserr_notsupp          cpu_to_be32(NFSERR_NOTSUPP)
160 #define nfserr_toosmall         cpu_to_be32(NFSERR_TOOSMALL)
161 #define nfserr_serverfault      cpu_to_be32(NFSERR_SERVERFAULT)
162 #define nfserr_badtype          cpu_to_be32(NFSERR_BADTYPE)
163 #define nfserr_jukebox          cpu_to_be32(NFSERR_JUKEBOX)
164 #define nfserr_denied           cpu_to_be32(NFSERR_DENIED)
165 #define nfserr_deadlock         cpu_to_be32(NFSERR_DEADLOCK)
166 #define nfserr_expired          cpu_to_be32(NFSERR_EXPIRED)
167 #define nfserr_bad_cookie       cpu_to_be32(NFSERR_BAD_COOKIE)
168 #define nfserr_same             cpu_to_be32(NFSERR_SAME)
169 #define nfserr_clid_inuse       cpu_to_be32(NFSERR_CLID_INUSE)
170 #define nfserr_stale_clientid   cpu_to_be32(NFSERR_STALE_CLIENTID)
171 #define nfserr_resource         cpu_to_be32(NFSERR_RESOURCE)
172 #define nfserr_moved            cpu_to_be32(NFSERR_MOVED)
173 #define nfserr_nofilehandle     cpu_to_be32(NFSERR_NOFILEHANDLE)
174 #define nfserr_minor_vers_mismatch      cpu_to_be32(NFSERR_MINOR_VERS_MISMATCH)
175 #define nfserr_share_denied     cpu_to_be32(NFSERR_SHARE_DENIED)
176 #define nfserr_stale_stateid    cpu_to_be32(NFSERR_STALE_STATEID)
177 #define nfserr_old_stateid      cpu_to_be32(NFSERR_OLD_STATEID)
178 #define nfserr_bad_stateid      cpu_to_be32(NFSERR_BAD_STATEID)
179 #define nfserr_bad_seqid        cpu_to_be32(NFSERR_BAD_SEQID)
180 #define nfserr_symlink          cpu_to_be32(NFSERR_SYMLINK)
181 #define nfserr_not_same         cpu_to_be32(NFSERR_NOT_SAME)
182 #define nfserr_lock_range       cpu_to_be32(NFSERR_LOCK_RANGE)
183 #define nfserr_restorefh        cpu_to_be32(NFSERR_RESTOREFH)
184 #define nfserr_attrnotsupp      cpu_to_be32(NFSERR_ATTRNOTSUPP)
185 #define nfserr_bad_xdr          cpu_to_be32(NFSERR_BAD_XDR)
186 #define nfserr_openmode         cpu_to_be32(NFSERR_OPENMODE)
187 #define nfserr_badowner         cpu_to_be32(NFSERR_BADOWNER)
188 #define nfserr_locks_held       cpu_to_be32(NFSERR_LOCKS_HELD)
189 #define nfserr_op_illegal       cpu_to_be32(NFSERR_OP_ILLEGAL)
190 #define nfserr_grace            cpu_to_be32(NFSERR_GRACE)
191 #define nfserr_no_grace         cpu_to_be32(NFSERR_NO_GRACE)
192 #define nfserr_reclaim_bad      cpu_to_be32(NFSERR_RECLAIM_BAD)
193 #define nfserr_badname          cpu_to_be32(NFSERR_BADNAME)
194 #define nfserr_cb_path_down     cpu_to_be32(NFSERR_CB_PATH_DOWN)
195 #define nfserr_locked           cpu_to_be32(NFSERR_LOCKED)
196 #define nfserr_wrongsec         cpu_to_be32(NFSERR_WRONGSEC)
197 #define nfserr_badiomode                cpu_to_be32(NFS4ERR_BADIOMODE)
198 #define nfserr_badlayout                cpu_to_be32(NFS4ERR_BADLAYOUT)
199 #define nfserr_bad_session_digest       cpu_to_be32(NFS4ERR_BAD_SESSION_DIGEST)
200 #define nfserr_badsession               cpu_to_be32(NFS4ERR_BADSESSION)
201 #define nfserr_badslot                  cpu_to_be32(NFS4ERR_BADSLOT)
202 #define nfserr_complete_already         cpu_to_be32(NFS4ERR_COMPLETE_ALREADY)
203 #define nfserr_conn_not_bound_to_session cpu_to_be32(NFS4ERR_CONN_NOT_BOUND_TO_SESSION)
204 #define nfserr_deleg_already_wanted     cpu_to_be32(NFS4ERR_DELEG_ALREADY_WANTED)
205 #define nfserr_back_chan_busy           cpu_to_be32(NFS4ERR_BACK_CHAN_BUSY)
206 #define nfserr_layouttrylater           cpu_to_be32(NFS4ERR_LAYOUTTRYLATER)
207 #define nfserr_layoutunavailable        cpu_to_be32(NFS4ERR_LAYOUTUNAVAILABLE)
208 #define nfserr_nomatching_layout        cpu_to_be32(NFS4ERR_NOMATCHING_LAYOUT)
209 #define nfserr_recallconflict           cpu_to_be32(NFS4ERR_RECALLCONFLICT)
210 #define nfserr_unknown_layouttype       cpu_to_be32(NFS4ERR_UNKNOWN_LAYOUTTYPE)
211 #define nfserr_seq_misordered           cpu_to_be32(NFS4ERR_SEQ_MISORDERED)
212 #define nfserr_sequence_pos             cpu_to_be32(NFS4ERR_SEQUENCE_POS)
213 #define nfserr_req_too_big              cpu_to_be32(NFS4ERR_REQ_TOO_BIG)
214 #define nfserr_rep_too_big              cpu_to_be32(NFS4ERR_REP_TOO_BIG)
215 #define nfserr_rep_too_big_to_cache     cpu_to_be32(NFS4ERR_REP_TOO_BIG_TO_CACHE)
216 #define nfserr_retry_uncached_rep       cpu_to_be32(NFS4ERR_RETRY_UNCACHED_REP)
217 #define nfserr_unsafe_compound          cpu_to_be32(NFS4ERR_UNSAFE_COMPOUND)
218 #define nfserr_too_many_ops             cpu_to_be32(NFS4ERR_TOO_MANY_OPS)
219 #define nfserr_op_not_in_session        cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION)
220 #define nfserr_hash_alg_unsupp          cpu_to_be32(NFS4ERR_HASH_ALG_UNSUPP)
221 #define nfserr_clientid_busy            cpu_to_be32(NFS4ERR_CLIENTID_BUSY)
222 #define nfserr_pnfs_io_hole             cpu_to_be32(NFS4ERR_PNFS_IO_HOLE)
223 #define nfserr_seq_false_retry          cpu_to_be32(NFS4ERR_SEQ_FALSE_RETRY)
224 #define nfserr_bad_high_slot            cpu_to_be32(NFS4ERR_BAD_HIGH_SLOT)
225 #define nfserr_deadsession              cpu_to_be32(NFS4ERR_DEADSESSION)
226 #define nfserr_encr_alg_unsupp          cpu_to_be32(NFS4ERR_ENCR_ALG_UNSUPP)
227 #define nfserr_pnfs_no_layout           cpu_to_be32(NFS4ERR_PNFS_NO_LAYOUT)
228 #define nfserr_not_only_op              cpu_to_be32(NFS4ERR_NOT_ONLY_OP)
229 #define nfserr_wrong_cred               cpu_to_be32(NFS4ERR_WRONG_CRED)
230 #define nfserr_wrong_type               cpu_to_be32(NFS4ERR_WRONG_TYPE)
231 #define nfserr_dirdeleg_unavail         cpu_to_be32(NFS4ERR_DIRDELEG_UNAVAIL)
232 #define nfserr_reject_deleg             cpu_to_be32(NFS4ERR_REJECT_DELEG)
233 #define nfserr_returnconflict           cpu_to_be32(NFS4ERR_RETURNCONFLICT)
234 #define nfserr_deleg_revoked            cpu_to_be32(NFS4ERR_DELEG_REVOKED)
235 
236 /* error codes for internal use */
237 /* if a request fails due to kmalloc failure, it gets dropped.
238  *  Client should resend eventually
239  */
240 #define nfserr_dropit           cpu_to_be32(30000)
241 /* end-of-file indicator in readdir */
242 #define nfserr_eof              cpu_to_be32(30001)
243 /* replay detected */
244 #define nfserr_replay_me        cpu_to_be32(11001)
245 /* nfs41 replay detected */
246 #define nfserr_replay_cache     cpu_to_be32(11002)
247 
248 /* Check for dir entries '.' and '..' */
249 #define isdotent(n, l)  (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
250 
251 /*
252  * Time of server startup
253  */
254 extern struct timeval   nfssvc_boot;
255 
256 #ifdef CONFIG_NFSD_V4
257 
258 extern time_t nfsd4_lease;
259 extern time_t nfsd4_grace;
260 
261 /* before processing a COMPOUND operation, we have to check that there
262  * is enough space in the buffer for XDR encode to succeed.  otherwise,
263  * we might process an operation with side effects, and be unable to
264  * tell the client that the operation succeeded.
265  *
266  * COMPOUND_SLACK_SPACE - this is the minimum bytes of buffer space
267  * needed to encode an "ordinary" _successful_ operation.  (GETATTR,
268  * READ, READDIR, and READLINK have their own buffer checks.)  if we
269  * fall below this level, we fail the next operation with NFS4ERR_RESOURCE.
270  *
271  * COMPOUND_ERR_SLACK_SPACE - this is the minimum bytes of buffer space
272  * needed to encode an operation which has failed with NFS4ERR_RESOURCE.
273  * care is taken to ensure that we never fall below this level for any
274  * reason.
275  */
276 #define COMPOUND_SLACK_SPACE            140    /* OP_GETFH */
277 #define COMPOUND_ERR_SLACK_SPACE        12     /* OP_SETATTR */
278 
279 #define NFSD_LAUNDROMAT_MINTIMEOUT      1   /* seconds */
280 
281 /*
282  * The following attributes are currently not supported by the NFSv4 server:
283  *    ARCHIVE       (deprecated anyway)
284  *    HIDDEN        (unlikely to be supported any time soon)
285  *    MIMETYPE      (unlikely to be supported any time soon)
286  *    QUOTA_*       (will be supported in a forthcoming patch)
287  *    SYSTEM        (unlikely to be supported any time soon)
288  *    TIME_BACKUP   (unlikely to be supported any time soon)
289  *    TIME_CREATE   (unlikely to be supported any time soon)
290  */
291 #define NFSD4_SUPPORTED_ATTRS_WORD0                                                         \
292 (FATTR4_WORD0_SUPPORTED_ATTRS   | FATTR4_WORD0_TYPE         | FATTR4_WORD0_FH_EXPIRE_TYPE   \
293  | FATTR4_WORD0_CHANGE          | FATTR4_WORD0_SIZE         | FATTR4_WORD0_LINK_SUPPORT     \
294  | FATTR4_WORD0_SYMLINK_SUPPORT | FATTR4_WORD0_NAMED_ATTR   | FATTR4_WORD0_FSID             \
295  | FATTR4_WORD0_UNIQUE_HANDLES  | FATTR4_WORD0_LEASE_TIME   | FATTR4_WORD0_RDATTR_ERROR     \
296  | FATTR4_WORD0_ACLSUPPORT      | FATTR4_WORD0_CANSETTIME   | FATTR4_WORD0_CASE_INSENSITIVE \
297  | FATTR4_WORD0_CASE_PRESERVING | FATTR4_WORD0_CHOWN_RESTRICTED                             \
298  | FATTR4_WORD0_FILEHANDLE      | FATTR4_WORD0_FILEID       | FATTR4_WORD0_FILES_AVAIL      \
299  | FATTR4_WORD0_FILES_FREE      | FATTR4_WORD0_FILES_TOTAL  | FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_HOMOGENEOUS      \
300  | FATTR4_WORD0_MAXFILESIZE     | FATTR4_WORD0_MAXLINK      | FATTR4_WORD0_MAXNAME          \
301  | FATTR4_WORD0_MAXREAD         | FATTR4_WORD0_MAXWRITE     | FATTR4_WORD0_ACL)
302 
303 #define NFSD4_SUPPORTED_ATTRS_WORD1                                                         \
304 (FATTR4_WORD1_MODE              | FATTR4_WORD1_NO_TRUNC     | FATTR4_WORD1_NUMLINKS         \
305  | FATTR4_WORD1_OWNER           | FATTR4_WORD1_OWNER_GROUP  | FATTR4_WORD1_RAWDEV           \
306  | FATTR4_WORD1_SPACE_AVAIL     | FATTR4_WORD1_SPACE_FREE   | FATTR4_WORD1_SPACE_TOTAL      \
307  | FATTR4_WORD1_SPACE_USED      | FATTR4_WORD1_TIME_ACCESS  | FATTR4_WORD1_TIME_ACCESS_SET  \
308  | FATTR4_WORD1_TIME_DELTA   | FATTR4_WORD1_TIME_METADATA    \
309  | FATTR4_WORD1_TIME_MODIFY     | FATTR4_WORD1_TIME_MODIFY_SET | FATTR4_WORD1_MOUNTED_ON_FILEID)
310 
311 #define NFSD4_SUPPORTED_ATTRS_WORD2 0
312 
313 #define NFSD4_1_SUPPORTED_ATTRS_WORD0 \
314         NFSD4_SUPPORTED_ATTRS_WORD0
315 
316 #define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
317         NFSD4_SUPPORTED_ATTRS_WORD1
318 
319 #define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
320         (NFSD4_SUPPORTED_ATTRS_WORD2 | FATTR4_WORD2_SUPPATTR_EXCLCREAT)
321 
322 static inline u32 nfsd_suppattrs0(u32 minorversion)
323 {
324         return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD0
325                             : NFSD4_SUPPORTED_ATTRS_WORD0;
326 }
327 
328 static inline u32 nfsd_suppattrs1(u32 minorversion)
329 {
330         return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD1
331                             : NFSD4_SUPPORTED_ATTRS_WORD1;
332 }
333 
334 static inline u32 nfsd_suppattrs2(u32 minorversion)
335 {
336         return minorversion ? NFSD4_1_SUPPORTED_ATTRS_WORD2
337                             : NFSD4_SUPPORTED_ATTRS_WORD2;
338 }
339 
340 /* These will return ERR_INVAL if specified in GETATTR or READDIR. */
341 #define NFSD_WRITEONLY_ATTRS_WORD1                                                          \
342 (FATTR4_WORD1_TIME_ACCESS_SET   | FATTR4_WORD1_TIME_MODIFY_SET)
343 
344 /* These are the only attrs allowed in CREATE/OPEN/SETATTR. */
345 #define NFSD_WRITEABLE_ATTRS_WORD0                                                          \
346 (FATTR4_WORD0_SIZE              | FATTR4_WORD0_ACL                                         )
347 #define NFSD_WRITEABLE_ATTRS_WORD1                                                          \
348 (FATTR4_WORD1_MODE              | FATTR4_WORD1_OWNER         | FATTR4_WORD1_OWNER_GROUP     \
349  | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
350 #define NFSD_WRITEABLE_ATTRS_WORD2 0
351 
352 #define NFSD_SUPPATTR_EXCLCREAT_WORD0 \
353         NFSD_WRITEABLE_ATTRS_WORD0
354 /*
355  * we currently store the exclusive create verifier in the v_{a,m}time
356  * attributes so the client can't set these at create time using EXCLUSIVE4_1
357  */
358 #define NFSD_SUPPATTR_EXCLCREAT_WORD1 \
359         (NFSD_WRITEABLE_ATTRS_WORD1 & \
360          ~(FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET))
361 #define NFSD_SUPPATTR_EXCLCREAT_WORD2 \
362         NFSD_WRITEABLE_ATTRS_WORD2
363 
364 extern int nfsd4_is_junction(struct dentry *dentry);
365 #else
366 static inline int nfsd4_is_junction(struct dentry *dentry)
367 {
368         return 0;
369 }
370 
371 #endif /* CONFIG_NFSD_V4 */
372 
373 #endif /* LINUX_NFSD_NFSD_H */
374 

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