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

FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_common.c
