ea26d58729
Removed dead code that assumed that M_TRYWAIT can return NULL; it's not true since the advent of MBUMA. Reviewed by: arch There are ongoing disputes as to whether we want to switch to directly using UMA flags M_WAITOK/M_NOWAIT for mbuf(9) allocation.
338 lines
7.6 KiB
C
338 lines
7.6 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfs_subs.c 8.8 (Berkeley) 5/22/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* These functions support the macros and help fiddle mbuf chains for
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* the nfs op functions. They do things like create the rpc header and
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* copy data between mbuf chains and uio lists.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/malloc.h>
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#include <sys/sysent.h>
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#include <sys/syscall.h>
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#include <vm/vm.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfsserver/nfs.h>
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#include <nfs/xdr_subs.h>
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#include <nfs/nfs_common.h>
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#include <netinet/in.h>
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enum vtype nv3tov_type[8]= {
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VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO
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};
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nfstype nfsv3_type[9] = {
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NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFSOCK, NFFIFO, NFNON
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};
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static void *nfsm_dissect_xx_sub(int s, struct mbuf **md, caddr_t *dpos, int how);
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u_quad_t
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nfs_curusec(void)
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{
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struct timeval tv;
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getmicrotime(&tv);
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return ((u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec);
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}
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/*
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* copies mbuf chain to the uio scatter/gather list
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*/
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int
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nfsm_mbuftouio(struct mbuf **mrep, struct uio *uiop, int siz, caddr_t *dpos)
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{
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char *mbufcp, *uiocp;
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int xfer, left, len;
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struct mbuf *mp;
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long uiosiz, rem;
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int error = 0;
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mp = *mrep;
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mbufcp = *dpos;
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len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
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rem = nfsm_rndup(siz)-siz;
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while (siz > 0) {
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if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
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return (EFBIG);
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left = uiop->uio_iov->iov_len;
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uiocp = uiop->uio_iov->iov_base;
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if (left > siz)
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left = siz;
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uiosiz = left;
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while (left > 0) {
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while (len == 0) {
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mp = mp->m_next;
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if (mp == NULL)
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return (EBADRPC);
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mbufcp = mtod(mp, caddr_t);
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len = mp->m_len;
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}
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xfer = (left > len) ? len : left;
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#ifdef notdef
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/* Not Yet.. */
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if (uiop->uio_iov->iov_op != NULL)
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(*(uiop->uio_iov->iov_op))
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(mbufcp, uiocp, xfer);
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else
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#endif
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if (uiop->uio_segflg == UIO_SYSSPACE)
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bcopy(mbufcp, uiocp, xfer);
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else
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copyout(mbufcp, uiocp, xfer);
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left -= xfer;
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len -= xfer;
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mbufcp += xfer;
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uiocp += xfer;
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uiop->uio_offset += xfer;
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uiop->uio_resid -= xfer;
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}
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if (uiop->uio_iov->iov_len <= siz) {
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uiop->uio_iovcnt--;
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uiop->uio_iov++;
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} else {
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uiop->uio_iov->iov_base =
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(char *)uiop->uio_iov->iov_base + uiosiz;
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uiop->uio_iov->iov_len -= uiosiz;
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}
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siz -= uiosiz;
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}
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*dpos = mbufcp;
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*mrep = mp;
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if (rem > 0) {
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if (len < rem)
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error = nfs_adv(mrep, dpos, rem, len);
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else
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*dpos += rem;
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}
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return (error);
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}
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/*
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* Help break down an mbuf chain by setting the first siz bytes contiguous
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* pointed to by returned val.
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* This is used by the macros nfsm_dissect for tough
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* cases. (The macros use the vars. dpos and dpos2)
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*/
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void *
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nfsm_disct(struct mbuf **mdp, caddr_t *dposp, int siz, int left, int how)
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{
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struct mbuf *mp, *mp2;
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int siz2, xfer;
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caddr_t ptr, npos = NULL;
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void *ret;
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mp = *mdp;
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while (left == 0) {
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*mdp = mp = mp->m_next;
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if (mp == NULL)
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return NULL;
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left = mp->m_len;
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*dposp = mtod(mp, caddr_t);
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}
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if (left >= siz) {
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ret = *dposp;
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*dposp += siz;
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} else if (mp->m_next == NULL) {
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return NULL;
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} else if (siz > MHLEN) {
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panic("nfs S too big");
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} else {
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MGET(mp2, how, MT_DATA);
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if (mp2 == NULL)
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return NULL;
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mp2->m_len = siz;
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mp2->m_next = mp->m_next;
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mp->m_next = mp2;
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mp->m_len -= left;
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mp = mp2;
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ptr = mtod(mp, caddr_t);
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ret = ptr;
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bcopy(*dposp, ptr, left); /* Copy what was left */
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siz2 = siz-left;
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ptr += left;
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mp2 = mp->m_next;
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npos = mtod(mp2, caddr_t);
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/* Loop around copying up the siz2 bytes */
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while (siz2 > 0) {
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if (mp2 == NULL)
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return NULL;
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xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
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if (xfer > 0) {
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bcopy(mtod(mp2, caddr_t), ptr, xfer);
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mp2->m_data += xfer;
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mp2->m_len -= xfer;
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ptr += xfer;
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siz2 -= xfer;
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}
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if (siz2 > 0) {
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mp2 = mp2->m_next;
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if (mp2 != NULL)
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npos = mtod(mp2, caddr_t);
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}
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}
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*mdp = mp2;
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*dposp = mtod(mp2, caddr_t);
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if (!nfsm_aligned(*dposp, u_int32_t)) {
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bcopy(*dposp, npos, mp2->m_len);
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mp2->m_data = npos;
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*dposp = npos;
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}
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}
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return ret;
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}
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/*
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* Advance the position in the mbuf chain.
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*/
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int
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nfs_adv(struct mbuf **mdp, caddr_t *dposp, int offs, int left)
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{
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struct mbuf *m;
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int s;
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m = *mdp;
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s = left;
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while (s < offs) {
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offs -= s;
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m = m->m_next;
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if (m == NULL)
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return (EBADRPC);
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s = m->m_len;
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}
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*mdp = m;
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*dposp = mtod(m, caddr_t)+offs;
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return (0);
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}
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void *
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nfsm_build_xx(int s, struct mbuf **mb, caddr_t *bpos)
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{
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struct mbuf *mb2;
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void *ret;
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if (s > M_TRAILINGSPACE(*mb)) {
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MGET(mb2, M_WAIT, MT_DATA);
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if (s > MLEN)
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panic("build > MLEN");
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(*mb)->m_next = mb2;
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*mb = mb2;
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(*mb)->m_len = 0;
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*bpos = mtod(*mb, caddr_t);
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}
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ret = *bpos;
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(*mb)->m_len += s;
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*bpos += s;
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return ret;
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}
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void *
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nfsm_dissect_xx(int s, struct mbuf **md, caddr_t *dpos)
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{
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return nfsm_dissect_xx_sub(s, md, dpos, M_WAIT);
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}
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void *
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nfsm_dissect_xx_nonblock(int s, struct mbuf **md, caddr_t *dpos)
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{
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return nfsm_dissect_xx_sub(s, md, dpos, M_DONTWAIT);
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}
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static void *
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nfsm_dissect_xx_sub(int s, struct mbuf **md, caddr_t *dpos, int how)
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{
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int t1;
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char *cp2;
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void *ret;
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t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
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if (t1 >= s) {
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ret = *dpos;
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*dpos += s;
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return ret;
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}
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cp2 = nfsm_disct(md, dpos, s, t1, how);
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return cp2;
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}
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int
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nfsm_strsiz_xx(int *s, int m, struct mbuf **mb, caddr_t *bpos)
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{
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u_int32_t *tl;
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tl = nfsm_dissect_xx(NFSX_UNSIGNED, mb, bpos);
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if (tl == NULL)
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return EBADRPC;
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*s = fxdr_unsigned(int32_t, *tl);
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if (*s > m)
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return EBADRPC;
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return 0;
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}
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int
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nfsm_adv_xx(int s, struct mbuf **md, caddr_t *dpos)
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{
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int t1;
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t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
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if (t1 >= s) {
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*dpos += s;
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return 0;
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}
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t1 = nfs_adv(md, dpos, s, t1);
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if (t1)
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return t1;
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return 0;
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}
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