1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * 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 are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the University of California, Berkeley. The name of the 14 * University may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 * @(#)nfsm_subs.h 7.6 (Berkeley) 02/16/90 21 */ 22 23 /* 24 * These macros do strange and peculiar things to mbuf chains for 25 * the assistance of the nfs code. To attempt to use them for any 26 * other purpose will be dangerous. (they make weird assumptions) 27 */ 28 29 /* 30 * First define what the actual subs. return 31 */ 32 extern struct mbuf *nfsm_reqh(); 33 extern struct vnode *nfs_fhtovp(); 34 35 /* 36 * To try and deal with different variants of mbuf.h, I have used the 37 * following defs. If M_HASCL is not defined in an older the 4.4bsd mbuf.h, 38 * you will have to use a different ifdef 39 */ 40 #ifdef M_HASCL 41 #define NFSMCLGET(m, w) MCLGET(m) 42 #define NFSMGETHDR(m) MGET(m, M_WAIT, MT_DATA) 43 #define MHLEN MLEN 44 #define NFSMINOFF(m) \ 45 if (M_HASCL(m)) \ 46 (m)->m_off = ((int)MTOCL(m))-(int)(m); \ 47 else \ 48 (m)->m_off = MMINOFF 49 #define NFSMADV(m, s) (m)->m_off += (s) 50 #define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES:MLEN) 51 #define m_nextpkt m_act 52 #define NFSMCOPY(m, o, l, w) m_copy((m), (o), (l)) 53 #else 54 #define M_HASCL(m) ((m)->m_flags & M_EXT) 55 #define NFSMCLGET MCLGET 56 #define NFSMGETHDR(m) \ 57 MGETHDR(m, M_WAIT, MT_DATA); \ 58 (m)->m_pkthdr.len = 0; \ 59 (m)->m_pkthdr.rcvif = (struct ifnet *)0 60 #define NFSMINOFF(m) \ 61 if (M_HASCL(m)) \ 62 (m)->m_data = (m)->m_ext.ext_buf; \ 63 else \ 64 (m)->m_data = (m)->m_dat 65 #define NFSMADV(m, s) (m)->m_data += (s) 66 #define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \ 67 (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN)) 68 #define NFSMCOPY m_copym 69 #endif 70 71 #ifndef MCLBYTES 72 #define MCLBYTES CLBYTES 73 #endif 74 75 #ifndef MT_CONTROL 76 #define MT_CONTROL MT_RIGHTS 77 #endif 78 79 /* 80 * Now for the macros that do the simple stuff and call the functions 81 * for the hard stuff. 82 * These macros use several vars. declared in nfsm_reqhead and these 83 * vars. must not be used elsewhere unless you are careful not to corrupt 84 * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries 85 * that may be used so long as the value is not expected to retained 86 * after a macro. 87 * I know, this is kind of dorkey, but it makes the actual op functions 88 * fairly clean and deals with the mess caused by the xdr discriminating 89 * unions. 90 */ 91 92 #ifndef lint 93 #define nfsm_build(a,c,s) \ 94 t1 = NFSMSIZ(mb); \ 95 if ((s) > (t1-mb->m_len)) { \ 96 MGET(mb2, M_WAIT, MT_DATA); \ 97 if ((s) > MLEN) \ 98 panic("build > MLEN"); \ 99 mb->m_next = mb2; \ 100 mb = mb2; \ 101 mb->m_len = 0; \ 102 bpos = mtod(mb, caddr_t); \ 103 } \ 104 (a) = (c)(bpos); \ 105 mb->m_len += (s); \ 106 bpos += (s) 107 #else /* lint */ 108 #define nfsm_build(a,c,s) \ 109 t1 = NFSMSIZ(mb); \ 110 if ((s) > (t1-mb->m_len)) { \ 111 MGET(mb2, M_WAIT, MT_DATA); \ 112 mb->m_next = mb2; \ 113 mb = mb2; \ 114 mb->m_len = 0; \ 115 bpos = mtod(mb, caddr_t); \ 116 } \ 117 (a) = (c)(bpos); \ 118 mb->m_len += (s); \ 119 bpos += (s) 120 #endif /* lint */ 121 122 #define nfsm_disect(a,c,s) \ 123 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 124 if (t1 >= (s)) { \ 125 (a) = (c)(dpos); \ 126 dpos += (s); \ 127 } else if (error = nfsm_disct(&md, &dpos, (s), t1, TRUE, &cp2)) { \ 128 m_freem(mrep); \ 129 goto nfsmout; \ 130 } else { \ 131 (a) = (c)cp2; \ 132 } 133 134 #define nfsm_disecton(a,c,s) \ 135 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 136 if (t1 >= (s)) { \ 137 (a) = (c)(dpos); \ 138 dpos += (s); \ 139 } else if (error = nfsm_disct(&md, &dpos, (s), t1, FALSE, &cp2)) { \ 140 m_freem(mrep); \ 141 goto nfsmout; \ 142 } else { \ 143 (a) = (c)cp2; \ 144 } 145 146 #define nfsm_fhtom(v) \ 147 nfsm_build(cp,caddr_t,NFSX_FH); \ 148 bcopy((caddr_t)&(VTONFS(v)->n_fh), cp, NFSX_FH) 149 150 #define nfsm_srvfhtom(f) \ 151 nfsm_build(cp,caddr_t,NFSX_FH); \ 152 bcopy((caddr_t)(f), cp, NFSX_FH) 153 154 #define nfsm_mtofh(d,v) \ 155 { struct nfsnode *np; nfsv2fh_t *fhp; \ 156 nfsm_disect(fhp,nfsv2fh_t *,NFSX_FH); \ 157 if (error = nfs_nget((d)->v_mount, fhp, &np)) { \ 158 m_freem(mrep); \ 159 goto nfsmout; \ 160 } \ 161 (v) = NFSTOV(np); \ 162 nfsm_loadattr(v, (struct vattr *)0); \ 163 } 164 165 #define nfsm_loadattr(v,a) \ 166 { struct vnode *tvp = (v); \ 167 if (error = nfs_loadattrcache(&tvp, &md, &dpos, (a))) { \ 168 m_freem(mrep); \ 169 goto nfsmout; \ 170 } \ 171 (v) = tvp; } 172 173 #define nfsm_strsiz(s,m) \ 174 nfsm_disect(p,u_long *,NFSX_UNSIGNED); \ 175 if (((s) = fxdr_unsigned(long,*p)) > (m)) { \ 176 m_freem(mrep); \ 177 error = EBADRPC; \ 178 goto nfsmout; \ 179 } 180 181 #define nfsm_srvstrsiz(s,m) \ 182 nfsm_disect(p,u_long *,NFSX_UNSIGNED); \ 183 if (((s) = fxdr_unsigned(long,*p)) > (m) || (s) <= 0) { \ 184 error = EBADRPC; \ 185 nfsm_reply(0); \ 186 } 187 188 #define nfsm_mtouio(p,s) \ 189 if ((s) > 0 && \ 190 (error = nfsm_mbuftouio(&md,(p),(s),&dpos))) { \ 191 m_freem(mrep); \ 192 goto nfsmout; \ 193 } 194 195 #define nfsm_uiotom(p,s) \ 196 if (error = nfsm_uiotombuf((p),&mb,(s),&bpos)) { \ 197 m_freem(mreq); \ 198 goto nfsmout; \ 199 } 200 201 #define nfsm_reqhead(a,c,s) \ 202 if ((mreq = nfsm_reqh(nfs_prog,nfs_vers,(a),(c),(s),&bpos,&mb,&xid)) == NULL) { \ 203 error = ENOBUFS; \ 204 goto nfsmout; \ 205 } 206 207 #define nfsm_reqdone m_freem(mrep); \ 208 nfsmout: 209 210 #define nfsm_rndup(a) (((a)+3)&(~0x3)) 211 212 #define nfsm_request(v, t) \ 213 if (error = nfs_request((v), mreq, xid, 5*(t), \ 214 (v)->v_mount, &mrep, &md, &dpos)) \ 215 goto nfsmout 216 217 #define nfsm_strtom(a,s,m) \ 218 if ((s) > (m)) { \ 219 m_freem(mreq); \ 220 error = ENAMETOOLONG; \ 221 goto nfsmout; \ 222 } \ 223 t2 = nfsm_rndup(s)+NFSX_UNSIGNED; \ 224 if(t2<=(NFSMSIZ(mb)-mb->m_len)){ \ 225 nfsm_build(p,u_long *,t2); \ 226 *p++ = txdr_unsigned(s); \ 227 *(p+((t2>>2)-2)) = 0; \ 228 bcopy((caddr_t)(a), (caddr_t)p, (s)); \ 229 } else if (error = nfsm_strtmbuf(&mb, &bpos, (a), (s))) { \ 230 m_freem(mreq); \ 231 goto nfsmout; \ 232 } 233 234 #define nfsm_srverr \ 235 { \ 236 m_freem(mrep); \ 237 return(ENOBUFS); \ 238 } 239 240 #define nfsm_srvdone \ 241 nfsmout: \ 242 return(error) 243 244 #ifndef lint 245 #define nfsm_reply(s) \ 246 { \ 247 *repstat = error; \ 248 if (error) \ 249 nfs_rephead(0, xid, error, mrq, &mb, &bpos); \ 250 else \ 251 nfs_rephead((s), xid, error, mrq, &mb, &bpos); \ 252 m_freem(mrep); \ 253 mreq = *mrq; \ 254 if (error) \ 255 return(0); \ 256 } 257 #else /* lint */ 258 #define nfsm_reply(s) \ 259 { \ 260 *repstat = error; \ 261 if (error) \ 262 nfs_rephead(0, xid, error, mrq, &mb, &bpos); \ 263 else \ 264 nfs_rephead((s), xid, error, mrq, &mb, &bpos); \ 265 m_freem(mrep); \ 266 mreq = *mrq; \ 267 mrep = mreq; \ 268 if (error) \ 269 return(0); \ 270 } 271 #endif /* lint */ 272 273 #define nfsm_adv(s) \ 274 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 275 if (t1 >= (s)) { \ 276 dpos += (s); \ 277 } else if (error = nfs_adv(&md, &dpos, (s), t1)) { \ 278 m_freem(mrep); \ 279 goto nfsmout; \ 280 } 281 282 #define nfsm_srvmtofh(f) \ 283 nfsm_disecton(p, u_long *, NFSX_FH); \ 284 bcopy((caddr_t)p, (caddr_t)f, NFSX_FH) 285 286 #define nfsm_clget \ 287 if (bp >= be) { \ 288 MGET(mp, M_WAIT, MT_DATA); \ 289 NFSMCLGET(mp, M_WAIT); \ 290 mp->m_len = NFSMSIZ(mp); \ 291 if (mp3 == NULL) \ 292 mp3 = mp2 = mp; \ 293 else { \ 294 mp2->m_next = mp; \ 295 mp2 = mp; \ 296 } \ 297 bp = mtod(mp, caddr_t); \ 298 be = bp+mp->m_len; \ 299 } \ 300 p = (u_long *)bp 301 302 #define nfsm_srvfillattr \ 303 fp->fa_type = vtonfs_type(vap->va_type); \ 304 fp->fa_mode = vtonfs_mode(vap->va_type, vap->va_mode); \ 305 fp->fa_nlink = txdr_unsigned(vap->va_nlink); \ 306 fp->fa_uid = txdr_unsigned(vap->va_uid); \ 307 fp->fa_gid = txdr_unsigned(vap->va_gid); \ 308 fp->fa_size = txdr_unsigned(vap->va_size); \ 309 fp->fa_blocksize = txdr_unsigned(vap->va_blocksize); \ 310 fp->fa_rdev = txdr_unsigned(vap->va_rdev); \ 311 fp->fa_blocks = txdr_unsigned(vap->va_bytes / vap->va_blocksize); \ 312 fp->fa_fsid = txdr_unsigned(vap->va_fsid); \ 313 fp->fa_fileid = txdr_unsigned(vap->va_fileid); \ 314 fp->fa_atime.tv_sec = txdr_unsigned(vap->va_atime.tv_sec); \ 315 fp->fa_atime.tv_usec = txdr_unsigned(vap->va_flags); \ 316 txdr_time(&vap->va_mtime, &fp->fa_mtime); \ 317 fp->fa_ctime.tv_sec = txdr_unsigned(vap->va_ctime.tv_sec); \ 318 fp->fa_ctime.tv_usec = txdr_unsigned(vap->va_gen) 319 320