nfs_common.c

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    1 /*
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  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, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)nfs_subs.c  8.8 (Berkeley) 5/22/95
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: releng/5.2/sys/nfs/nfs_common.c 111119 2003-02-19 05:47:46Z imp $");
   41 
   42 /*
   43  * These functions support the macros and help fiddle mbuf chains for
   44  * the nfs op functions. They do things like create the rpc header and
   45  * copy data between mbuf chains and uio lists.
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/kernel.h>
   51 #include <sys/bio.h>
   52 #include <sys/buf.h>
   53 #include <sys/proc.h>
   54 #include <sys/mount.h>
   55 #include <sys/vnode.h>
   56 #include <sys/namei.h>
   57 #include <sys/mbuf.h>
   58 #include <sys/socket.h>
   59 #include <sys/stat.h>
   60 #include <sys/malloc.h>
   61 #include <sys/sysent.h>
   62 #include <sys/syscall.h>
   63 
   64 #include <vm/vm.h>
   65 #include <vm/vm_object.h>
   66 #include <vm/vm_extern.h>
   67 
   68 #include <nfs/rpcv2.h>
   69 #include <nfs/nfsproto.h>
   70 #include <nfsserver/nfs.h>
   71 #include <nfs/xdr_subs.h>
   72 #include <nfs/nfs_common.h>
   73 
   74 #include <netinet/in.h>
   75 
   76 enum vtype nv3tov_type[8]= {
   77         VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO
   78 };
   79 nfstype nfsv3_type[9] = {
   80         NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFSOCK, NFFIFO, NFNON
   81 };
   82 
   83 u_quad_t
   84 nfs_curusec(void) 
   85 {
   86         struct timeval tv;
   87 
   88         getmicrotime(&tv);
   89         return ((u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec);
   90 }
   91 
   92 /*
   93  * copies mbuf chain to the uio scatter/gather list
   94  */
   95 int
   96 nfsm_mbuftouio(struct mbuf **mrep, struct uio *uiop, int siz, caddr_t *dpos)
   97 {
   98         char *mbufcp, *uiocp;
   99         int xfer, left, len;
  100         struct mbuf *mp;
  101         long uiosiz, rem;
  102         int error = 0;
  103 
  104         mp = *mrep;
  105         mbufcp = *dpos;
  106         len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
  107         rem = nfsm_rndup(siz)-siz;
  108         while (siz > 0) {
  109                 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
  110                         return (EFBIG);
  111                 left = uiop->uio_iov->iov_len;
  112                 uiocp = uiop->uio_iov->iov_base;
  113                 if (left > siz)
  114                         left = siz;
  115                 uiosiz = left;
  116                 while (left > 0) {
  117                         while (len == 0) {
  118                                 mp = mp->m_next;
  119                                 if (mp == NULL)
  120                                         return (EBADRPC);
  121                                 mbufcp = mtod(mp, caddr_t);
  122                                 len = mp->m_len;
  123                         }
  124                         xfer = (left > len) ? len : left;
  125 #ifdef notdef
  126                         /* Not Yet.. */
  127                         if (uiop->uio_iov->iov_op != NULL)
  128                                 (*(uiop->uio_iov->iov_op))
  129                                 (mbufcp, uiocp, xfer);
  130                         else
  131 #endif
  132                         if (uiop->uio_segflg == UIO_SYSSPACE)
  133                                 bcopy(mbufcp, uiocp, xfer);
  134                         else
  135                                 copyout(mbufcp, uiocp, xfer);
  136                         left -= xfer;
  137                         len -= xfer;
  138                         mbufcp += xfer;
  139                         uiocp += xfer;
  140                         uiop->uio_offset += xfer;
  141                         uiop->uio_resid -= xfer;
  142                 }
  143                 if (uiop->uio_iov->iov_len <= siz) {
  144                         uiop->uio_iovcnt--;
  145                         uiop->uio_iov++;
  146                 } else {
  147                         uiop->uio_iov->iov_base =
  148                             (char *)uiop->uio_iov->iov_base + uiosiz;
  149                         uiop->uio_iov->iov_len -= uiosiz;
  150                 }
  151                 siz -= uiosiz;
  152         }
  153         *dpos = mbufcp;
  154         *mrep = mp;
  155         if (rem > 0) {
  156                 if (len < rem)
  157                         error = nfs_adv(mrep, dpos, rem, len);
  158                 else
  159                         *dpos += rem;
  160         }
  161         return (error);
  162 }
  163 
  164 /*
  165  * Help break down an mbuf chain by setting the first siz bytes contiguous
  166  * pointed to by returned val.
  167  * This is used by the macros nfsm_dissect for tough
  168  * cases. (The macros use the vars. dpos and dpos2)
  169  */
  170 void *
  171 nfsm_disct(struct mbuf **mdp, caddr_t *dposp, int siz, int left)
  172 {
  173         struct mbuf *mp, *mp2;
  174         int siz2, xfer;
  175         caddr_t ptr;
  176         void *ret;
  177 
  178         mp = *mdp;
  179         while (left == 0) {
  180                 *mdp = mp = mp->m_next;
  181                 if (mp == NULL)
  182                         return NULL;
  183                 left = mp->m_len;
  184                 *dposp = mtod(mp, caddr_t);
  185         }
  186         if (left >= siz) {
  187                 ret = *dposp;
  188                 *dposp += siz;
  189         } else if (mp->m_next == NULL) {
  190                 return NULL;
  191         } else if (siz > MHLEN) {
  192                 panic("nfs S too big");
  193         } else {
  194                 MGET(mp2, M_TRYWAIT, MT_DATA);
  195                 mp2->m_next = mp->m_next;
  196                 mp->m_next = mp2;
  197                 mp->m_len -= left;
  198                 mp = mp2;
  199                 ptr = mtod(mp, caddr_t);
  200                 ret = ptr;
  201                 bcopy(*dposp, ptr, left);               /* Copy what was left */
  202                 siz2 = siz-left;
  203                 ptr += left;
  204                 mp2 = mp->m_next;
  205                 /* Loop around copying up the siz2 bytes */
  206                 while (siz2 > 0) {
  207                         if (mp2 == NULL)
  208                                 return NULL;
  209                         xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
  210                         if (xfer > 0) {
  211                                 bcopy(mtod(mp2, caddr_t), ptr, xfer);
  212                                 mp2->m_data += xfer;
  213                                 mp2->m_len -= xfer;
  214                                 ptr += xfer;
  215                                 siz2 -= xfer;
  216                         }
  217                         if (siz2 > 0)
  218                                 mp2 = mp2->m_next;
  219                 }
  220                 mp->m_len = siz;
  221                 *mdp = mp2;
  222                 *dposp = mtod(mp2, caddr_t);
  223         }
  224         return ret;
  225 }
  226 
  227 /*
  228  * Advance the position in the mbuf chain.
  229  */
  230 int
  231 nfs_adv(struct mbuf **mdp, caddr_t *dposp, int offs, int left)
  232 {
  233         struct mbuf *m;
  234         int s;
  235 
  236         m = *mdp;
  237         s = left;
  238         while (s < offs) {
  239                 offs -= s;
  240                 m = m->m_next;
  241                 if (m == NULL)
  242                         return (EBADRPC);
  243                 s = m->m_len;
  244         }
  245         *mdp = m;
  246         *dposp = mtod(m, caddr_t)+offs;
  247         return (0);
  248 }
  249 
  250 void *
  251 nfsm_build_xx(int s, struct mbuf **mb, caddr_t *bpos)
  252 {
  253         struct mbuf *mb2;
  254         void *ret;
  255 
  256         if (s > M_TRAILINGSPACE(*mb)) {
  257                 MGET(mb2, M_TRYWAIT, MT_DATA);
  258                 if (s > MLEN)
  259                         panic("build > MLEN");
  260                 (*mb)->m_next = mb2;
  261                 *mb = mb2;
  262                 (*mb)->m_len = 0;
  263                 *bpos = mtod(*mb, caddr_t);
  264         }
  265         ret = *bpos;
  266         (*mb)->m_len += s;
  267         *bpos += s;
  268         return ret;
  269 }
  270 
  271 void *
  272 nfsm_dissect_xx(int s, struct mbuf **md, caddr_t *dpos)
  273 {
  274         int t1;
  275         char *cp2;
  276         void *ret;
  277 
  278         t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
  279         if (t1 >= s) {
  280                 ret = *dpos;
  281                 *dpos += s;
  282                 return ret;
  283         }
  284         cp2 = nfsm_disct(md, dpos, s, t1); 
  285         return cp2;
  286 }
  287 
  288 int
  289 nfsm_strsiz_xx(int *s, int m, struct mbuf **mb, caddr_t *bpos)
  290 {
  291         u_int32_t *tl;
  292 
  293         tl = nfsm_dissect_xx(NFSX_UNSIGNED, mb, bpos);
  294         if (tl == NULL)
  295                 return EBADRPC;
  296         *s = fxdr_unsigned(int32_t, *tl);
  297         if (*s > m)
  298                 return EBADRPC;
  299         return 0;
  300 }
  301 
  302 int
  303 nfsm_adv_xx(int s, struct mbuf **md, caddr_t *dpos)
  304 {
  305         int t1;
  306 
  307         t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
  308         if (t1 >= s) {
  309                 *dpos += s;
  310                 return 0;
  311         }
  312         t1 = nfs_adv(md, dpos, s, t1);
  313         if (t1)
  314                 return t1;
  315         return 0;
  316 }
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FreeBSD/Linux Kernel Cross Reference sys/nfs/nfs_common.c

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sys/nfs/nfs_common.c
