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 * %sccs.include.redist.c% 9 * 10 * @(#)nfsm_subs.h 7.11 (Berkeley) 04/16/91 11 */ 12 13 /* 14 * These macros do strange and peculiar things to mbuf chains for 15 * the assistance of the nfs code. To attempt to use them for any 16 * other purpose will be dangerous. (they make weird assumptions) 17 */ 18 19 /* 20 * First define what the actual subs. return 21 */ 22 extern struct mbuf *nfsm_reqh(); 23 24 #define M_HASCL(m) ((m)->m_flags & M_EXT) 25 #define NFSMGETHDR(m) \ 26 MGETHDR(m, M_WAIT, MT_DATA); \ 27 (m)->m_pkthdr.len = 0; \ 28 (m)->m_pkthdr.rcvif = (struct ifnet *)0 29 #define NFSMINOFF(m) \ 30 if (M_HASCL(m)) \ 31 (m)->m_data = (m)->m_ext.ext_buf; \ 32 else \ 33 (m)->m_data = (m)->m_dat 34 #define NFSMADV(m, s) (m)->m_data += (s) 35 #define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \ 36 (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN)) 37 38 /* 39 * Now for the macros that do the simple stuff and call the functions 40 * for the hard stuff. 41 * These macros use several vars. declared in nfsm_reqhead and these 42 * vars. must not be used elsewhere unless you are careful not to corrupt 43 * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries 44 * that may be used so long as the value is not expected to retained 45 * after a macro. 46 * I know, this is kind of dorkey, but it makes the actual op functions 47 * fairly clean and deals with the mess caused by the xdr discriminating 48 * unions. 49 */ 50 51 #ifndef lint 52 #define nfsm_build(a,c,s) \ 53 t1 = NFSMSIZ(mb); \ 54 if ((s) > (t1-mb->m_len)) { \ 55 MGET(mb2, M_WAIT, MT_DATA); \ 56 if ((s) > MLEN) \ 57 panic("build > MLEN"); \ 58 mb->m_next = mb2; \ 59 mb = mb2; \ 60 mb->m_len = 0; \ 61 bpos = mtod(mb, caddr_t); \ 62 } \ 63 (a) = (c)(bpos); \ 64 mb->m_len += (s); \ 65 bpos += (s) 66 #else /* lint */ 67 #define nfsm_build(a,c,s) \ 68 t1 = NFSMSIZ(mb); \ 69 if ((s) > (t1-mb->m_len)) { \ 70 MGET(mb2, M_WAIT, MT_DATA); \ 71 mb->m_next = mb2; \ 72 mb = mb2; \ 73 mb->m_len = 0; \ 74 bpos = mtod(mb, caddr_t); \ 75 } \ 76 (a) = (c)(bpos); \ 77 mb->m_len += (s); \ 78 bpos += (s) 79 #endif /* lint */ 80 81 #define nfsm_disect(a,c,s) \ 82 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 83 if (t1 >= (s)) { \ 84 (a) = (c)(dpos); \ 85 dpos += (s); \ 86 } else if (error = nfsm_disct(&md, &dpos, (s), t1, TRUE, &cp2)) { \ 87 m_freem(mrep); \ 88 goto nfsmout; \ 89 } else { \ 90 (a) = (c)cp2; \ 91 } 92 93 #define nfsm_disecton(a,c,s) \ 94 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 95 if (t1 >= (s)) { \ 96 (a) = (c)(dpos); \ 97 dpos += (s); \ 98 } else if (error = nfsm_disct(&md, &dpos, (s), t1, FALSE, &cp2)) { \ 99 m_freem(mrep); \ 100 goto nfsmout; \ 101 } else { \ 102 (a) = (c)cp2; \ 103 } 104 105 #define nfsm_fhtom(v) \ 106 nfsm_build(cp,caddr_t,NFSX_FH); \ 107 bcopy((caddr_t)&(VTONFS(v)->n_fh), cp, NFSX_FH) 108 109 #define nfsm_srvfhtom(f) \ 110 nfsm_build(cp,caddr_t,NFSX_FH); \ 111 bcopy((caddr_t)(f), cp, NFSX_FH) 112 113 #define nfsm_mtofh(d,v) \ 114 { struct nfsnode *np; nfsv2fh_t *fhp; \ 115 nfsm_disect(fhp,nfsv2fh_t *,NFSX_FH); \ 116 if (error = nfs_nget((d)->v_mount, fhp, &np)) { \ 117 m_freem(mrep); \ 118 goto nfsmout; \ 119 } \ 120 (v) = NFSTOV(np); \ 121 nfsm_loadattr(v, (struct vattr *)0); \ 122 } 123 124 #define nfsm_loadattr(v,a) \ 125 { struct vnode *tvp = (v); \ 126 if (error = nfs_loadattrcache(&tvp, &md, &dpos, (a))) { \ 127 m_freem(mrep); \ 128 goto nfsmout; \ 129 } \ 130 (v) = tvp; } 131 132 #define nfsm_strsiz(s,m) \ 133 nfsm_disect(tl,u_long *,NFSX_UNSIGNED); \ 134 if (((s) = fxdr_unsigned(long,*tl)) > (m)) { \ 135 m_freem(mrep); \ 136 error = EBADRPC; \ 137 goto nfsmout; \ 138 } 139 140 #define nfsm_srvstrsiz(s,m) \ 141 nfsm_disect(tl,u_long *,NFSX_UNSIGNED); \ 142 if (((s) = fxdr_unsigned(long,*tl)) > (m) || (s) <= 0) { \ 143 error = EBADRPC; \ 144 nfsm_reply(0); \ 145 } 146 147 #define nfsm_mtouio(p,s) \ 148 if ((s) > 0 && \ 149 (error = nfsm_mbuftouio(&md,(p),(s),&dpos))) { \ 150 m_freem(mrep); \ 151 goto nfsmout; \ 152 } 153 154 #define nfsm_uiotom(p,s) \ 155 if (error = nfsm_uiotombuf((p),&mb,(s),&bpos)) { \ 156 m_freem(mreq); \ 157 goto nfsmout; \ 158 } 159 160 #define nfsm_reqhead(a,c,s) \ 161 if ((mreq = nfsm_reqh(nfs_prog,nfs_vers,(a),(c),(s),&bpos,&mb,&xid)) == NULL) { \ 162 error = ENOBUFS; \ 163 goto nfsmout; \ 164 } 165 166 #define nfsm_reqdone m_freem(mrep); \ 167 nfsmout: 168 169 #define nfsm_rndup(a) (((a)+3)&(~0x3)) 170 171 #define nfsm_request(v, t, p, h) \ 172 if (error = nfs_request((v), mreq, xid, (t), (p), (h), \ 173 (v)->v_mount, &mrep, &md, &dpos)) \ 174 goto nfsmout 175 176 #define nfsm_strtom(a,s,m) \ 177 if ((s) > (m)) { \ 178 m_freem(mreq); \ 179 error = ENAMETOOLONG; \ 180 goto nfsmout; \ 181 } \ 182 t2 = nfsm_rndup(s)+NFSX_UNSIGNED; \ 183 if(t2<=(NFSMSIZ(mb)-mb->m_len)){ \ 184 nfsm_build(tl,u_long *,t2); \ 185 *tl++ = txdr_unsigned(s); \ 186 *(tl+((t2>>2)-2)) = 0; \ 187 bcopy((caddr_t)(a), (caddr_t)tl, (s)); \ 188 } else if (error = nfsm_strtmbuf(&mb, &bpos, (a), (s))) { \ 189 m_freem(mreq); \ 190 goto nfsmout; \ 191 } 192 193 #define nfsm_srvdone \ 194 nfsmout: \ 195 return(error) 196 197 #ifndef lint 198 #define nfsm_reply(s) \ 199 { \ 200 *repstat = error; \ 201 if (error) \ 202 nfs_rephead(0, xid, error, mrq, &mb, &bpos); \ 203 else \ 204 nfs_rephead((s), xid, error, mrq, &mb, &bpos); \ 205 m_freem(mrep); \ 206 mreq = *mrq; \ 207 if (error) \ 208 return(0); \ 209 } 210 #else /* lint */ 211 #define nfsm_reply(s) \ 212 { \ 213 *repstat = error; \ 214 if (error) \ 215 nfs_rephead(0, xid, error, mrq, &mb, &bpos); \ 216 else \ 217 nfs_rephead((s), xid, error, mrq, &mb, &bpos); \ 218 m_freem(mrep); \ 219 mreq = *mrq; \ 220 mrep = mreq; \ 221 if (error) \ 222 return(0); \ 223 } 224 #endif /* lint */ 225 226 #define nfsm_adv(s) \ 227 t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 228 if (t1 >= (s)) { \ 229 dpos += (s); \ 230 } else if (error = nfs_adv(&md, &dpos, (s), t1)) { \ 231 m_freem(mrep); \ 232 goto nfsmout; \ 233 } 234 235 #define nfsm_srvmtofh(f) \ 236 nfsm_disecton(tl, u_long *, NFSX_FH); \ 237 bcopy((caddr_t)tl, (caddr_t)f, NFSX_FH) 238 239 #define nfsm_clget \ 240 if (bp >= be) { \ 241 MGET(mp, M_WAIT, MT_DATA); \ 242 MCLGET(mp, M_WAIT); \ 243 mp->m_len = NFSMSIZ(mp); \ 244 if (mp3 == NULL) \ 245 mp3 = mp2 = mp; \ 246 else { \ 247 mp2->m_next = mp; \ 248 mp2 = mp; \ 249 } \ 250 bp = mtod(mp, caddr_t); \ 251 be = bp+mp->m_len; \ 252 } \ 253 tl = (u_long *)bp 254 255 #define nfsm_srvfillattr \ 256 fp->fa_type = vtonfs_type(vap->va_type); \ 257 fp->fa_mode = vtonfs_mode(vap->va_type, vap->va_mode); \ 258 fp->fa_nlink = txdr_unsigned(vap->va_nlink); \ 259 fp->fa_uid = txdr_unsigned(vap->va_uid); \ 260 fp->fa_gid = txdr_unsigned(vap->va_gid); \ 261 fp->fa_size = txdr_unsigned(vap->va_size); \ 262 fp->fa_blocksize = txdr_unsigned(vap->va_blocksize); \ 263 if (vap->va_type == VFIFO) \ 264 fp->fa_rdev = 0xffffffff; \ 265 else \ 266 fp->fa_rdev = txdr_unsigned(vap->va_rdev); \ 267 fp->fa_blocks = txdr_unsigned(vap->va_bytes / NFS_FABLKSIZE); \ 268 fp->fa_fsid = txdr_unsigned(vap->va_fsid); \ 269 fp->fa_fileid = txdr_unsigned(vap->va_fileid); \ 270 fp->fa_atime.tv_sec = txdr_unsigned(vap->va_atime.tv_sec); \ 271 fp->fa_atime.tv_usec = txdr_unsigned(vap->va_flags); \ 272 txdr_time(&vap->va_mtime, &fp->fa_mtime); \ 273 fp->fa_ctime.tv_sec = txdr_unsigned(vap->va_ctime.tv_sec); \ 274 fp->fa_ctime.tv_usec = txdr_unsigned(vap->va_gen) 275 276