Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfsm_subs.h
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1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfsm_subs.h 8.1 (Berkeley) 6/16/93 37 * $FreeBSD: src/sys/nfs/nfsm_subs.h,v 1.9.2.1 1999/09/05 08:19:49 peter Exp $ 38 */ 39 40 #ifndef _NFS_NFSM_SUBS_H_ 41 #define _NFS_NFSM_SUBS_H_ 42 43 44 /* 45 * These macros do strange and peculiar things to mbuf chains for 46 * the assistance of the nfs code. To attempt to use them for any 47 * other purpose will be dangerous. (they make weird assumptions) 48 */ 49 50 /* 51 * First define what the actual subs. return 52 */ 53 struct mbuf *nfsm_reqh __P((struct vnode *vp, u_long procid, int hsiz, 54 caddr_t *bposp)); 55 struct mbuf *nfsm_rpchead __P((struct ucred *cr, int nmflag, int procid, 56 int auth_type, int auth_len, char *auth_str, 57 int verf_len, char *verf_str, 58 struct mbuf *mrest, int mrest_len, 59 struct mbuf **mbp, u_long *xidp)); 60 61 #define M_HASCL(m) ((m)->m_flags & M_EXT) 62 #define NFSMINOFF(m) \ 63 if (M_HASCL(m)) \ 64 (m)->m_data = (m)->m_ext.ext_buf; \ 65 else if ((m)->m_flags & M_PKTHDR) \ 66 (m)->m_data = (m)->m_pktdat; \ 67 else \ 68 (m)->m_data = (m)->m_dat 69 #define NFSMADV(m, s) (m)->m_data += (s) 70 #define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \ 71 (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN)) 72 73 /* 74 * Now for the macros that do the simple stuff and call the functions 75 * for the hard stuff. 76 * These macros use several vars. declared in nfsm_reqhead and these 77 * vars. must not be used elsewhere unless you are careful not to corrupt 78 * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries 79 * that may be used so long as the value is not expected to retained 80 * after a macro. 81 * I know, this is kind of dorkey, but it makes the actual op functions 82 * fairly clean and deals with the mess caused by the xdr discriminating 83 * unions. 84 */ 85 86 #define nfsm_build(a,c,s) \ 87 { if ((s) > M_TRAILINGSPACE(mb)) { \ 88 MGET(mb2, M_WAIT, MT_DATA); \ 89 if ((s) > MLEN) \ 90 panic("build > MLEN"); \ 91 mb->m_next = mb2; \ 92 mb = mb2; \ 93 mb->m_len = 0; \ 94 bpos = mtod(mb, caddr_t); \ 95 } \ 96 (a) = (c)(bpos); \ 97 mb->m_len += (s); \ 98 bpos += (s); } 99 100 #define nfsm_dissect(a, c, s) \ 101 { t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 102 if (t1 >= (s)) { \ 103 (a) = (c)(dpos); \ 104 dpos += (s); \ 105 } else if (t1 = nfsm_disct(&md, &dpos, (s), t1, &cp2)) { \ 106 error = t1; \ 107 m_freem(mrep); \ 108 goto nfsmout; \ 109 } else { \ 110 (a) = (c)cp2; \ 111 } } 112 113 #define nfsm_fhtom(v, v3) \ 114 { if (v3) { \ 115 t2 = nfsm_rndup(VTONFS(v)->n_fhsize) + NFSX_UNSIGNED; \ 116 if (t2 <= M_TRAILINGSPACE(mb)) { \ 117 nfsm_build(tl, u_long *, t2); \ 118 *tl++ = txdr_unsigned(VTONFS(v)->n_fhsize); \ 119 *(tl + ((t2>>2) - 2)) = 0; \ 120 bcopy((caddr_t)VTONFS(v)->n_fhp,(caddr_t)tl, \ 121 VTONFS(v)->n_fhsize); \ 122 } else if (t2 = nfsm_strtmbuf(&mb, &bpos, \ 123 (caddr_t)VTONFS(v)->n_fhp, VTONFS(v)->n_fhsize)) { \ 124 error = t2; \ 125 m_freem(mreq); \ 126 goto nfsmout; \ 127 } \ 128 } else { \ 129 nfsm_build(cp, caddr_t, NFSX_V2FH); \ 130 bcopy((caddr_t)VTONFS(v)->n_fhp, cp, NFSX_V2FH); \ 131 } } 132 133 #define nfsm_srvfhtom(f, v3) \ 134 { if (v3) { \ 135 nfsm_build(tl, u_long *, NFSX_UNSIGNED + NFSX_V3FH); \ 136 *tl++ = txdr_unsigned(NFSX_V3FH); \ 137 bcopy((caddr_t)(f), (caddr_t)tl, NFSX_V3FH); \ 138 } else { \ 139 nfsm_build(cp, caddr_t, NFSX_V2FH); \ 140 bcopy((caddr_t)(f), cp, NFSX_V2FH); \ 141 } } 142 143 #define nfsm_srvpostop_fh(f) \ 144 { nfsm_build(tl, u_long *, 2 * NFSX_UNSIGNED + NFSX_V3FH); \ 145 *tl++ = nfs_true; \ 146 *tl++ = txdr_unsigned(NFSX_V3FH); \ 147 bcopy((caddr_t)(f), (caddr_t)tl, NFSX_V3FH); \ 148 } 149 150 #define nfsm_mtofh(d, v, v3, f) \ 151 { struct nfsnode *ttnp; nfsfh_t *ttfhp; int ttfhsize; \ 152 if (v3) { \ 153 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 154 (f) = fxdr_unsigned(int, *tl); \ 155 } else \ 156 (f) = 1; \ 157 if (f) { \ 158 nfsm_getfh(ttfhp, ttfhsize, (v3)); \ 159 if (t1 = nfs_nget((d)->v_mount, ttfhp, ttfhsize, \ 160 &ttnp)) { \ 161 error = t1; \ 162 m_freem(mrep); \ 163 goto nfsmout; \ 164 } \ 165 (v) = NFSTOV(ttnp); \ 166 } \ 167 if (v3) { \ 168 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 169 if (f) \ 170 (f) = fxdr_unsigned(int, *tl); \ 171 else if (fxdr_unsigned(int, *tl)) \ 172 nfsm_adv(NFSX_V3FATTR); \ 173 } \ 174 if (f) \ 175 nfsm_loadattr((v), (struct vattr *)0); \ 176 } 177 178 #define nfsm_getfh(f, s, v3) \ 179 { if (v3) { \ 180 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 181 if (((s) = fxdr_unsigned(int, *tl)) <= 0 || \ 182 (s) > NFSX_V3FHMAX) { \ 183 m_freem(mrep); \ 184 error = EBADRPC; \ 185 goto nfsmout; \ 186 } \ 187 } else \ 188 (s) = NFSX_V2FH; \ 189 nfsm_dissect((f), nfsfh_t *, nfsm_rndup(s)); } 190 191 #define nfsm_loadattr(v, a) \ 192 { struct vnode *ttvp = (v); \ 193 if (t1 = nfs_loadattrcache(&ttvp, &md, &dpos, (a))) { \ 194 error = t1; \ 195 m_freem(mrep); \ 196 goto nfsmout; \ 197 } \ 198 (v) = ttvp; } 199 200 #define nfsm_postop_attr(v, f) \ 201 { struct vnode *ttvp = (v); \ 202 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 203 if ((f) = fxdr_unsigned(int, *tl)) { \ 204 if (t1 = nfs_loadattrcache(&ttvp, &md, &dpos, \ 205 (struct vattr *)0)) { \ 206 error = t1; \ 207 (f) = 0; \ 208 m_freem(mrep); \ 209 goto nfsmout; \ 210 } \ 211 (v) = ttvp; \ 212 } } 213 214 /* Used as (f) for nfsm_wcc_data() */ 215 #define NFSV3_WCCRATTR 0 216 #define NFSV3_WCCCHK 1 217 218 #define nfsm_wcc_data(v, f) \ 219 { int ttattrf, ttretf = 0; \ 220 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 221 if (*tl == nfs_true) { \ 222 nfsm_dissect(tl, u_long *, 6 * NFSX_UNSIGNED); \ 223 if (f) \ 224 ttretf = (VTONFS(v)->n_mtime == \ 225 fxdr_unsigned(u_long, *(tl + 2))); \ 226 } \ 227 nfsm_postop_attr((v), ttattrf); \ 228 if (f) { \ 229 (f) = ttretf; \ 230 } else { \ 231 (f) = ttattrf; \ 232 } } 233 234 #define nfsm_v3sattr(s, a, u, g) \ 235 { (s)->sa_modetrue = nfs_true; \ 236 (s)->sa_mode = vtonfsv3_mode((a)->va_mode); \ 237 (s)->sa_uidtrue = nfs_true; \ 238 (s)->sa_uid = txdr_unsigned(u); \ 239 (s)->sa_gidtrue = nfs_true; \ 240 (s)->sa_gid = txdr_unsigned(g); \ 241 (s)->sa_sizefalse = nfs_false; \ 242 (s)->sa_atimetype = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); \ 243 txdr_nfsv3time(&(a)->va_atime, &(s)->sa_atime); \ 244 (s)->sa_mtimetype = txdr_unsigned(NFSV3SATTRTIME_TOCLIENT); \ 245 txdr_nfsv3time(&(a)->va_mtime, &(s)->sa_mtime); \ 246 } 247 248 #define nfsm_strsiz(s,m) \ 249 { nfsm_dissect(tl,u_long *,NFSX_UNSIGNED); \ 250 if (((s) = fxdr_unsigned(long,*tl)) > (m)) { \ 251 m_freem(mrep); \ 252 error = EBADRPC; \ 253 goto nfsmout; \ 254 } } 255 256 #define nfsm_srvstrsiz(s,m) \ 257 { nfsm_dissect(tl,u_long *,NFSX_UNSIGNED); \ 258 if (((s) = fxdr_unsigned(long,*tl)) > (m) || (s) <= 0) { \ 259 error = EBADRPC; \ 260 nfsm_reply(0); \ 261 } } 262 263 #define nfsm_srvnamesiz(s) \ 264 { nfsm_dissect(tl,u_long *,NFSX_UNSIGNED); \ 265 if (((s) = fxdr_unsigned(long,*tl)) > NFS_MAXNAMLEN) \ 266 error = NFSERR_NAMETOL; \ 267 if ((s) <= 0) \ 268 error = EBADRPC; \ 269 if (error) \ 270 nfsm_reply(0); \ 271 } 272 273 #define nfsm_mtouio(p,s) \ 274 if ((s) > 0 && \ 275 (t1 = nfsm_mbuftouio(&md,(p),(s),&dpos))) { \ 276 error = t1; \ 277 m_freem(mrep); \ 278 goto nfsmout; \ 279 } 280 281 #define nfsm_uiotom(p,s) \ 282 if (t1 = nfsm_uiotombuf((p),&mb,(s),&bpos)) { \ 283 error = t1; \ 284 m_freem(mreq); \ 285 goto nfsmout; \ 286 } 287 288 #define nfsm_reqhead(v,a,s) \ 289 mb = mreq = nfsm_reqh((v),(a),(s),&bpos) 290 291 #define nfsm_reqdone m_freem(mrep); \ 292 nfsmout: 293 294 #define nfsm_rndup(a) (((a)+3)&(~0x3)) 295 296 #define nfsm_request(v, t, p, c) \ 297 if (error = nfs_request((v), mreq, (t), (p), \ 298 (c), &mrep, &md, &dpos)) { \ 299 if (error & NFSERR_RETERR) \ 300 error &= ~NFSERR_RETERR; \ 301 else \ 302 goto nfsmout; \ 303 } 304 305 #define nfsm_strtom(a,s,m) \ 306 if ((s) > (m)) { \ 307 m_freem(mreq); \ 308 error = ENAMETOOLONG; \ 309 goto nfsmout; \ 310 } \ 311 t2 = nfsm_rndup(s)+NFSX_UNSIGNED; \ 312 if (t2 <= M_TRAILINGSPACE(mb)) { \ 313 nfsm_build(tl,u_long *,t2); \ 314 *tl++ = txdr_unsigned(s); \ 315 *(tl+((t2>>2)-2)) = 0; \ 316 bcopy((caddr_t)(a), (caddr_t)tl, (s)); \ 317 } else if (t2 = nfsm_strtmbuf(&mb, &bpos, (a), (s))) { \ 318 error = t2; \ 319 m_freem(mreq); \ 320 goto nfsmout; \ 321 } 322 323 #define nfsm_srvdone \ 324 nfsmout: \ 325 return(error) 326 327 #define nfsm_reply(s) \ 328 { \ 329 nfsd->nd_repstat = error; \ 330 if (error && !(nfsd->nd_flag & ND_NFSV3)) \ 331 (void) nfs_rephead(0, nfsd, slp, error, cache, &frev, \ 332 mrq, &mb, &bpos); \ 333 else \ 334 (void) nfs_rephead((s), nfsd, slp, error, cache, &frev, \ 335 mrq, &mb, &bpos); \ 336 m_freem(mrep); \ 337 mreq = *mrq; \ 338 if (error && (!(nfsd->nd_flag & ND_NFSV3) || \ 339 error == EBADRPC)) \ 340 return(0); \ 341 } 342 343 #define nfsm_writereply(s, v3) \ 344 { \ 345 nfsd->nd_repstat = error; \ 346 if (error && !(v3)) \ 347 (void) nfs_rephead(0, nfsd, slp, error, cache, &frev, \ 348 &mreq, &mb, &bpos); \ 349 else \ 350 (void) nfs_rephead((s), nfsd, slp, error, cache, &frev, \ 351 &mreq, &mb, &bpos); \ 352 } 353 354 #define nfsm_adv(s) \ 355 { t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 356 if (t1 >= (s)) { \ 357 dpos += (s); \ 358 } else if (t1 = nfs_adv(&md, &dpos, (s), t1)) { \ 359 error = t1; \ 360 m_freem(mrep); \ 361 goto nfsmout; \ 362 } } 363 364 #define nfsm_srvmtofh(f) \ 365 { if (nfsd->nd_flag & ND_NFSV3) { \ 366 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 367 if (fxdr_unsigned(int, *tl) != NFSX_V3FH) { \ 368 error = EBADRPC; \ 369 nfsm_reply(0); \ 370 } \ 371 } \ 372 nfsm_dissect(tl, u_long *, NFSX_V3FH); \ 373 bcopy((caddr_t)tl, (caddr_t)(f), NFSX_V3FH); \ 374 if ((nfsd->nd_flag & ND_NFSV3) == 0) \ 375 nfsm_adv(NFSX_V2FH - NFSX_V3FH); \ 376 } 377 378 #define nfsm_clget \ 379 if (bp >= be) { \ 380 if (mp == mb) \ 381 mp->m_len += bp-bpos; \ 382 MGET(mp, M_WAIT, MT_DATA); \ 383 MCLGET(mp, M_WAIT); \ 384 mp->m_len = NFSMSIZ(mp); \ 385 mp2->m_next = mp; \ 386 mp2 = mp; \ 387 bp = mtod(mp, caddr_t); \ 388 be = bp+mp->m_len; \ 389 } \ 390 tl = (u_long *)bp 391 392 #define nfsm_srvfillattr(a, f) \ 393 nfsm_srvfattr(nfsd, (a), (f)) 394 395 #define nfsm_srvwcc_data(br, b, ar, a) \ 396 nfsm_srvwcc(nfsd, (br), (b), (ar), (a), &mb, &bpos) 397 398 #define nfsm_srvpostop_attr(r, a) \ 399 nfsm_srvpostopattr(nfsd, (r), (a), &mb, &bpos) 400 401 #define nfsm_srvsattr(a) \ 402 { nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 403 if (*tl == nfs_true) { \ 404 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 405 (a)->va_mode = nfstov_mode(*tl); \ 406 } \ 407 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 408 if (*tl == nfs_true) { \ 409 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 410 (a)->va_uid = fxdr_unsigned(uid_t, *tl); \ 411 } \ 412 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 413 if (*tl == nfs_true) { \ 414 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 415 (a)->va_gid = fxdr_unsigned(gid_t, *tl); \ 416 } \ 417 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 418 if (*tl == nfs_true) { \ 419 nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED); \ 420 fxdr_hyper(tl, &(a)->va_size); \ 421 } \ 422 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 423 switch (fxdr_unsigned(int, *tl)) { \ 424 case NFSV3SATTRTIME_TOCLIENT: \ 425 nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED); \ 426 fxdr_nfsv3time(tl, &(a)->va_atime); \ 427 break; \ 428 case NFSV3SATTRTIME_TOSERVER: \ 429 (a)->va_atime.tv_sec = time.tv_sec; \ 430 (a)->va_atime.tv_nsec = time.tv_usec * 1000; \ 431 break; \ 432 }; \ 433 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); \ 434 switch (fxdr_unsigned(int, *tl)) { \ 435 case NFSV3SATTRTIME_TOCLIENT: \ 436 nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED); \ 437 fxdr_nfsv3time(tl, &(a)->va_mtime); \ 438 break; \ 439 case NFSV3SATTRTIME_TOSERVER: \ 440 (a)->va_mtime.tv_sec = time.tv_sec; \ 441 (a)->va_mtime.tv_nsec = time.tv_usec * 1000; \ 442 break; \ 443 }; } 444 445 #endif
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