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 7.8 (Berkeley) 05/18/90 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 34 #define M_HASCL(m) ((m)->m_flags & M_EXT) 35 #define NFSMGETHDR(m) \ 36 MGETHDR(m, M_WAIT, MT_DATA); \ 37 (m)->m_pkthdr.len = 0; \ 38 (m)->m_pkthdr.rcvif = (struct ifnet *)0 39 #define NFSMINOFF(m) \ 40 if (M_HASCL(m)) \ 41 (m)->m_data = (m)->m_ext.ext_buf; \ 42 else \ 43 (m)->m_data = (m)->m_dat 44 #define NFSMADV(m, s) (m)->m_data += (s) 45 #define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \ 46 (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN)) 47 48 /* 49 * Now for the macros that do the simple stuff and call the functions 50 * for the hard stuff. 51 * These macros use several vars. declared in nfsm_reqhead and these 52 * vars. must not be used elsewhere unless you are careful not to corrupt 53 * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries 54 * that may be used so long as the value is not expected to retained 55 * after a macro. 56 * I know, this is kind of dorkey, but it makes the actual op functions 57 * fairly clean and deals with the mess caused by the xdr discriminating 58 * unions. 59 */ 60 61 #ifndef lint 62 #define nfsm_build(a,c,s) \ 63 t1 = NFSMSIZ(mb); \ 64 if ((s) > (t1-mb->m_len)) { \ 65 MGET(mb2, M_WAIT, MT_DATA); \ 66 if ((s) > MLEN) \ 67 panic("build > MLEN"); \ 68 mb->m_next = mb2; \ 69 mb = mb2; \ 70 mb->m_len = 0; \ 71 bpos = mtod(mb, caddr_t); \ 72 } \ 73 (a) = (c)(bpos); \ 74 mb->m_len += (s); \ 75 bpos += (s) 76 #else /* lint */ 77 #define nfsm_build(a,c,s) \ 78 t1 = NFSMSIZ(mb); \ 79 if ((s) > (t1-mb->m_len)) { \ 80 MGET(mb2, M_WAIT, MT_DATA); \ 81 mb->m_next = mb2; \ 82 mb = mb2; \ 83 mb->m_len = 0; \ 84 bpos = mtod(mb, caddr_t); \ 85 } \ 86 (a) = (c)(bpos); \ 87 mb->m_len += (s); \ 88 bpos += (s) 89 #endif /* lint */ 90 91 #define nfsm_disect(a,c,s) \ 92 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 93 if (t1 >= (s)) { \ 94 (a) = (c)(dpos); \ 95 dpos += (s); \ 96 } else if (error = nfsm_disct(&md, &dpos, (s), t1, TRUE, &cp2)) { \ 97 m_freem(mrep); \ 98 goto nfsmout; \ 99 } else { \ 100 (a) = (c)cp2; \ 101 } 102 103 #define nfsm_disecton(a,c,s) \ 104 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 105 if (t1 >= (s)) { \ 106 (a) = (c)(dpos); \ 107 dpos += (s); \ 108 } else if (error = nfsm_disct(&md, &dpos, (s), t1, FALSE, &cp2)) { \ 109 m_freem(mrep); \ 110 goto nfsmout; \ 111 } else { \ 112 (a) = (c)cp2; \ 113 } 114 115 #define nfsm_fhtom(v) \ 116 nfsm_build(cp,caddr_t,NFSX_FH); \ 117 bcopy((caddr_t)&(VTONFS(v)->n_fh), cp, NFSX_FH) 118 119 #define nfsm_srvfhtom(f) \ 120 nfsm_build(cp,caddr_t,NFSX_FH); \ 121 bcopy((caddr_t)(f), cp, NFSX_FH) 122 123 #define nfsm_mtofh(d,v) \ 124 { struct nfsnode *np; nfsv2fh_t *fhp; \ 125 nfsm_disect(fhp,nfsv2fh_t *,NFSX_FH); \ 126 if (error = nfs_nget((d)->v_mount, fhp, &np)) { \ 127 m_freem(mrep); \ 128 goto nfsmout; \ 129 } \ 130 (v) = NFSTOV(np); \ 131 nfsm_loadattr(v, (struct vattr *)0); \ 132 } 133 134 #define nfsm_loadattr(v,a) \ 135 { struct vnode *tvp = (v); \ 136 if (error = nfs_loadattrcache(&tvp, &md, &dpos, (a))) { \ 137 m_freem(mrep); \ 138 goto nfsmout; \ 139 } \ 140 (v) = tvp; } 141 142 #define nfsm_strsiz(s,m) \ 143 nfsm_disect(p,u_long *,NFSX_UNSIGNED); \ 144 if (((s) = fxdr_unsigned(long,*p)) > (m)) { \ 145 m_freem(mrep); \ 146 error = EBADRPC; \ 147 goto nfsmout; \ 148 } 149 150 #define nfsm_srvstrsiz(s,m) \ 151 nfsm_disect(p,u_long *,NFSX_UNSIGNED); \ 152 if (((s) = fxdr_unsigned(long,*p)) > (m) || (s) <= 0) { \ 153 error = EBADRPC; \ 154 nfsm_reply(0); \ 155 } 156 157 #define nfsm_mtouio(p,s) \ 158 if ((s) > 0 && \ 159 (error = nfsm_mbuftouio(&md,(p),(s),&dpos))) { \ 160 m_freem(mrep); \ 161 goto nfsmout; \ 162 } 163 164 #define nfsm_uiotom(p,s) \ 165 if (error = nfsm_uiotombuf((p),&mb,(s),&bpos)) { \ 166 m_freem(mreq); \ 167 goto nfsmout; \ 168 } 169 170 #define nfsm_reqhead(a,c,s) \ 171 if ((mreq = nfsm_reqh(nfs_prog,nfs_vers,(a),(c),(s),&bpos,&mb,&xid)) == NULL) { \ 172 error = ENOBUFS; \ 173 goto nfsmout; \ 174 } 175 176 #define nfsm_reqdone m_freem(mrep); \ 177 nfsmout: 178 179 #define nfsm_rndup(a) (((a)+3)&(~0x3)) 180 181 #define nfsm_request(v, t, p) \ 182 if (error = nfs_request((v), mreq, xid, (t), (p), \ 183 (v)->v_mount, &mrep, &md, &dpos)) \ 184 goto nfsmout 185 186 #define nfsm_strtom(a,s,m) \ 187 if ((s) > (m)) { \ 188 m_freem(mreq); \ 189 error = ENAMETOOLONG; \ 190 goto nfsmout; \ 191 } \ 192 t2 = nfsm_rndup(s)+NFSX_UNSIGNED; \ 193 if(t2<=(NFSMSIZ(mb)-mb->m_len)){ \ 194 nfsm_build(p,u_long *,t2); \ 195 *p++ = txdr_unsigned(s); \ 196 *(p+((t2>>2)-2)) = 0; \ 197 bcopy((caddr_t)(a), (caddr_t)p, (s)); \ 198 } else if (error = nfsm_strtmbuf(&mb, &bpos, (a), (s))) { \ 199 m_freem(mreq); \ 200 goto nfsmout; \ 201 } 202 203 #define nfsm_srvdone \ 204 nfsmout: \ 205 return(error) 206 207 #ifndef lint 208 #define nfsm_reply(s) \ 209 { \ 210 *repstat = error; \ 211 if (error) \ 212 nfs_rephead(0, xid, error, mrq, &mb, &bpos); \ 213 else \ 214 nfs_rephead((s), xid, error, mrq, &mb, &bpos); \ 215 m_freem(mrep); \ 216 mreq = *mrq; \ 217 if (error) \ 218 return(0); \ 219 } 220 #else /* lint */ 221 #define nfsm_reply(s) \ 222 { \ 223 *repstat = error; \ 224 if (error) \ 225 nfs_rephead(0, xid, error, mrq, &mb, &bpos); \ 226 else \ 227 nfs_rephead((s), xid, error, mrq, &mb, &bpos); \ 228 m_freem(mrep); \ 229 mreq = *mrq; \ 230 mrep = mreq; \ 231 if (error) \ 232 return(0); \ 233 } 234 #endif /* lint */ 235 236 #define nfsm_adv(s) \ 237 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 238 if (t1 >= (s)) { \ 239 dpos += (s); \ 240 } else if (error = nfs_adv(&md, &dpos, (s), t1)) { \ 241 m_freem(mrep); \ 242 goto nfsmout; \ 243 } 244 245 #define nfsm_srvmtofh(f) \ 246 nfsm_disecton(p, u_long *, NFSX_FH); \ 247 bcopy((caddr_t)p, (caddr_t)f, NFSX_FH) 248 249 #define nfsm_clget \ 250 if (bp >= be) { \ 251 MGET(mp, M_WAIT, MT_DATA); \ 252 MCLGET(mp, M_WAIT); \ 253 mp->m_len = NFSMSIZ(mp); \ 254 if (mp3 == NULL) \ 255 mp3 = mp2 = mp; \ 256 else { \ 257 mp2->m_next = mp; \ 258 mp2 = mp; \ 259 } \ 260 bp = mtod(mp, caddr_t); \ 261 be = bp+mp->m_len; \ 262 } \ 263 p = (u_long *)bp 264 265 #define nfsm_srvfillattr \ 266 fp->fa_type = vtonfs_type(vap->va_type); \ 267 fp->fa_mode = vtonfs_mode(vap->va_type, vap->va_mode); \ 268 fp->fa_nlink = txdr_unsigned(vap->va_nlink); \ 269 fp->fa_uid = txdr_unsigned(vap->va_uid); \ 270 fp->fa_gid = txdr_unsigned(vap->va_gid); \ 271 fp->fa_size = txdr_unsigned(vap->va_size); \ 272 fp->fa_blocksize = txdr_unsigned(vap->va_blocksize); \ 273 if (vap->va_type == VFIFO) \ 274 fp->fa_rdev = 0xffffffff; \ 275 else \ 276 fp->fa_rdev = txdr_unsigned(vap->va_rdev); \ 277 fp->fa_blocks = txdr_unsigned(vap->va_bytes / NFS_FABLKSIZE); \ 278 fp->fa_fsid = txdr_unsigned(vap->va_fsid); \ 279 fp->fa_fileid = txdr_unsigned(vap->va_fileid); \ 280 fp->fa_atime.tv_sec = txdr_unsigned(vap->va_atime.tv_sec); \ 281 fp->fa_atime.tv_usec = txdr_unsigned(vap->va_flags); \ 282 txdr_time(&vap->va_mtime, &fp->fa_mtime); \ 283 fp->fa_ctime.tv_sec = txdr_unsigned(vap->va_ctime.tv_sec); \ 284 fp->fa_ctime.tv_usec = txdr_unsigned(vap->va_gen) 285 286