usr/src/sys/nfs/nfsm_subs.h

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rick Macklem at The University of Guelph.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)nfsm_subs.h 7.14 (Berkeley) %G%
 */

/*
 * These macros do strange and peculiar things to mbuf chains for
 * the assistance of the nfs code. To attempt to use them for any
 * other purpose will be dangerous. (they make weird assumptions)
 */

/*
 * First define what the actual subs. return
 */
extern struct mbuf *nfsm_reqh();

#define M_HASCL(m)      ((m)->m_flags & M_EXT)
#define NFSMINOFF(m) \
                if (M_HASCL(m)) \
                        (m)->m_data = (m)->m_ext.ext_buf; \
                else if ((m)->m_flags & M_PKTHDR) \
                        (m)->m_data = (m)->m_pktdat; \
                else \
                        (m)->m_data = (m)->m_dat
#define NFSMADV(m, s)   (m)->m_data += (s)
#define NFSMSIZ(m)      ((M_HASCL(m))?MCLBYTES: \
                                (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN))

/*
 * Now for the macros that do the simple stuff and call the functions
 * for the hard stuff.
 * These macros use several vars. declared in nfsm_reqhead and these
 * vars. must not be used elsewhere unless you are careful not to corrupt
 * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries
 * that may be used so long as the value is not expected to retained
 * after a macro.
 * I know, this is kind of dorkey, but it makes the actual op functions
 * fairly clean and deals with the mess caused by the xdr discriminating
 * unions.
 */

#define nfsm_build(a,c,s) \
                { if ((s) > M_TRAILINGSPACE(mb)) { \
                        MGET(mb2, M_WAIT, MT_DATA); \
                        if ((s) > MLEN) \
                                panic("build > MLEN"); \
                        mb->m_next = mb2; \
                        mb = mb2; \
                        mb->m_len = 0; \
                        bpos = mtod(mb, caddr_t); \
                } \
                (a) = (c)(bpos); \
                mb->m_len += (s); \
                bpos += (s); }

#define nfsm_dissect(a,c,s) \
                { t1 = mtod(md, caddr_t)+md->m_len-dpos; \
                if (t1 >= (s)) { \
                        (a) = (c)(dpos); \
                        dpos += (s); \
                } else if (error = nfsm_disct(&md, &dpos, (s), t1, TRUE, &cp2)) { \
                        m_freem(mrep); \
                        goto nfsmout; \
                } else { \
                        (a) = (c)cp2; \
                } }

#define nfsm_dissecton(a,c,s) \
                { t1 = mtod(md, caddr_t)+md->m_len-dpos; \
                if (t1 >= (s)) { \
                        (a) = (c)(dpos); \
                        dpos += (s); \
                } else if (error = nfsm_disct(&md, &dpos, (s), t1, FALSE, &cp2)) { \
                        m_freem(mrep); \
                        goto nfsmout; \
                } else { \
                        (a) = (c)cp2; \
                } }

#define nfsm_fhtom(v) \
                nfsm_build(cp,caddr_t,NFSX_FH); \
                bcopy((caddr_t)&(VTONFS(v)->n_fh), cp, NFSX_FH)

#define nfsm_srvfhtom(f) \
                nfsm_build(cp,caddr_t,NFSX_FH); \
                bcopy((caddr_t)(f), cp, NFSX_FH)

#define nfsm_mtofh(d,v) \
                { struct nfsnode *np; nfsv2fh_t *fhp; \
                nfsm_dissect(fhp,nfsv2fh_t *,NFSX_FH); \
                if (error = nfs_nget((d)->v_mount, fhp, &np)) { \
                        m_freem(mrep); \
                        goto nfsmout; \
                } \
                (v) = NFSTOV(np); \
                nfsm_loadattr(v, (struct vattr *)0); \
                }

#define nfsm_loadattr(v,a) \
                { struct vnode *tvp = (v); \
                if (error = nfs_loadattrcache(&tvp, &md, &dpos, (a))) { \
                        m_freem(mrep); \
                        goto nfsmout; \
                } \
                (v) = tvp; }

#define nfsm_strsiz(s,m) \
                { nfsm_dissect(tl,u_long *,NFSX_UNSIGNED); \
                if (((s) = fxdr_unsigned(long,*tl)) > (m)) { \
                        m_freem(mrep); \
                        error = EBADRPC; \
                        goto nfsmout; \
                } }

#define nfsm_srvstrsiz(s,m) \
                { nfsm_dissect(tl,u_long *,NFSX_UNSIGNED); \
                if (((s) = fxdr_unsigned(long,*tl)) > (m) || (s) <= 0) { \
                        error = EBADRPC; \
                        nfsm_reply(0); \
                } }

#define nfsm_mtouio(p,s) \
                if ((s) > 0 && \
                   (error = nfsm_mbuftouio(&md,(p),(s),&dpos))) { \
                        m_freem(mrep); \
                        goto nfsmout; \
                }

#define nfsm_uiotom(p,s) \
                if (error = nfsm_uiotombuf((p),&mb,(s),&bpos)) { \
                        m_freem(mreq); \
                        goto nfsmout; \
                }

#define nfsm_reqhead(v,a,s) \
                mb = mreq = nfsm_reqh((v),(a),(s),&bpos)

#define nfsm_reqdone    m_freem(mrep); \
                nfsmout:

#define nfsm_rndup(a)   (((a)+3)&(~0x3))

#define nfsm_request(v, t, p, c)        \
                if (error = nfs_request((v), mreq, (t), (p), \
                   (c), &mrep, &md, &dpos)) \
                        goto nfsmout

#define nfsm_strtom(a,s,m) \
                if ((s) > (m)) { \
                        m_freem(mreq); \
                        error = ENAMETOOLONG; \
                        goto nfsmout; \
                } \
                t2 = nfsm_rndup(s)+NFSX_UNSIGNED; \
                if (t2 <= M_TRAILINGSPACE(mb)) { \
                        nfsm_build(tl,u_long *,t2); \
                        *tl++ = txdr_unsigned(s); \
                        *(tl+((t2>>2)-2)) = 0; \
                        bcopy((caddr_t)(a), (caddr_t)tl, (s)); \
                } else if (error = nfsm_strtmbuf(&mb, &bpos, (a), (s))) { \
                        m_freem(mreq); \
                        goto nfsmout; \
                }

#define nfsm_srvdone \
                nfsmout: \
                return(error)

#define nfsm_reply(s) \
                { \
                nfsd->nd_repstat = error; \
                if (error) \
                   (void) nfs_rephead(0, nfsd, error, cache, &frev, \
                        mrq, &mb, &bpos); \
                else \
                   (void) nfs_rephead((s), nfsd, error, cache, &frev, \
                        mrq, &mb, &bpos); \
                m_freem(mrep); \
                mreq = *mrq; \
                if (error) \
                        return(0); \
                }

#define nfsm_adv(s) \
                t1 = mtod(md, caddr_t)+md->m_len-dpos; \
                if (t1 >= (s)) { \
                        dpos += (s); \
                } else if (error = nfs_adv(&md, &dpos, (s), t1)) { \
                        m_freem(mrep); \
                        goto nfsmout; \
                }

#define nfsm_srvmtofh(f) \
                nfsm_dissecton(tl, u_long *, NFSX_FH); \
                bcopy((caddr_t)tl, (caddr_t)f, NFSX_FH)

#define nfsm_clget \
                if (bp >= be) { \
                        if (mp == mb) \
                                mp->m_len += bp-bpos; \
                        MGET(mp, M_WAIT, MT_DATA); \
                        MCLGET(mp, M_WAIT); \
                        mp->m_len = NFSMSIZ(mp); \
                        mp2->m_next = mp; \
                        mp2 = mp; \
                        bp = mtod(mp, caddr_t); \
                        be = bp+mp->m_len; \
                } \
                tl = (u_long *)bp

#define nfsm_srvfillattr \
        fp->fa_type = vtonfs_type(vap->va_type); \
        fp->fa_mode = vtonfs_mode(vap->va_type, vap->va_mode); \
        fp->fa_nlink = txdr_unsigned(vap->va_nlink); \
        fp->fa_uid = txdr_unsigned(vap->va_uid); \
        fp->fa_gid = txdr_unsigned(vap->va_gid); \
        if (nfsd->nd_nqlflag == NQL_NOVAL) { \
                fp->fa_nfsblocksize = txdr_unsigned(vap->va_blocksize); \
                if (vap->va_type == VFIFO) \
                        fp->fa_nfsrdev = 0xffffffff; \
                else \
                        fp->fa_nfsrdev = txdr_unsigned(vap->va_rdev); \
                fp->fa_nfsfsid = txdr_unsigned(vap->va_fsid); \
                fp->fa_nfsfileid = txdr_unsigned(vap->va_fileid); \
                fp->fa_nfssize = txdr_unsigned(vap->va_size); \
                fp->fa_nfsblocks = txdr_unsigned(vap->va_bytes / NFS_FABLKSIZE); \
                fp->fa_nfsatime.nfs_sec = txdr_unsigned(vap->va_atime.ts_sec); \
                fp->fa_nfsatime.nfs_usec = txdr_unsigned(vap->va_flags); \
                txdr_nfstime(&vap->va_mtime, &fp->fa_nfsmtime); \
                fp->fa_nfsctime.nfs_sec = txdr_unsigned(vap->va_ctime.ts_sec); \
                fp->fa_nfsctime.nfs_usec = txdr_unsigned(vap->va_gen); \
        } else { \
                fp->fa_nqblocksize = txdr_unsigned(vap->va_blocksize); \
                if (vap->va_type == VFIFO) \
                        fp->fa_nqrdev = 0xffffffff; \
                else \
                        fp->fa_nqrdev = txdr_unsigned(vap->va_rdev); \
                fp->fa_nqfsid = txdr_unsigned(vap->va_fsid); \
                fp->fa_nqfileid = txdr_unsigned(vap->va_fileid); \
                txdr_hyper(&vap->va_size, &fp->fa_nqsize); \
                txdr_hyper(&vap->va_bytes, &fp->fa_nqbytes); \
                txdr_nqtime(&vap->va_atime, &fp->fa_nqatime); \
                txdr_nqtime(&vap->va_mtime, &fp->fa_nqmtime); \
                txdr_nqtime(&vap->va_ctime, &fp->fa_nqctime); \
                fp->fa_nqflags = txdr_unsigned(vap->va_flags); \
                fp->fa_nqgen = txdr_unsigned(vap->va_gen); \
                txdr_hyper(&vap->va_filerev, &fp->fa_nqfilerev); \
        }