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: releng/8.0/sys/nfs/nfs_common.c 195631 2009-07-12 03:53:52Z marcel $");
   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/nfsproto.h>
   65 #include <nfsserver/nfs.h>
   66 #include <nfs/xdr_subs.h>
   67 #include <nfs/nfs_common.h>
   68 
   69 #include <netinet/in.h>
   70 
   71 enum vtype nv3tov_type[8]= {
   72         VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO
   73 };
   74 nfstype nfsv3_type[9] = {
   75         NFNON, NFREG, NFDIR, NFBLK, NFCHR, NFLNK, NFSOCK, NFFIFO, NFNON
   76 };
   77 
   78 static void *nfsm_dissect_xx_sub(int s, struct mbuf **md, caddr_t *dpos, int how);
   79 
   80 u_quad_t
   81 nfs_curusec(void) 
   82 {
   83         struct timeval tv;
   84 
   85         getmicrotime(&tv);
   86         return ((u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec);
   87 }
   88 
   89 /*
   90  * copies mbuf chain to the uio scatter/gather list
   91  */
   92 int
   93 nfsm_mbuftouio(struct mbuf **mrep, struct uio *uiop, int siz, caddr_t *dpos)
   94 {
   95         char *mbufcp, *uiocp;
   96         int xfer, left, len;
   97         struct mbuf *mp;
   98         long uiosiz, rem;
   99         int error = 0;
  100 
  101         mp = *mrep;
  102         mbufcp = *dpos;
  103         len = mtod(mp, caddr_t)+mp->m_len-mbufcp;
  104         rem = nfsm_rndup(siz)-siz;
  105         while (siz > 0) {
  106                 if (uiop->uio_iovcnt <= 0 || uiop->uio_iov == NULL)
  107                         return (EFBIG);
  108                 left = uiop->uio_iov->iov_len;
  109                 uiocp = uiop->uio_iov->iov_base;
  110                 if (left > siz)
  111                         left = siz;
  112                 uiosiz = left;
  113                 while (left > 0) {
  114                         while (len == 0) {
  115                                 mp = mp->m_next;
  116                                 if (mp == NULL)
  117                                         return (EBADRPC);
  118                                 mbufcp = mtod(mp, caddr_t);
  119                                 len = mp->m_len;
  120                         }
  121                         xfer = (left > len) ? len : left;
  122 #ifdef notdef
  123                         /* Not Yet.. */
  124                         if (uiop->uio_iov->iov_op != NULL)
  125                                 (*(uiop->uio_iov->iov_op))
  126                                 (mbufcp, uiocp, xfer);
  127                         else
  128 #endif
  129                         if (uiop->uio_segflg == UIO_SYSSPACE)
  130                                 bcopy(mbufcp, uiocp, xfer);
  131                         else
  132                                 copyout(mbufcp, uiocp, xfer);
  133                         left -= xfer;
  134                         len -= xfer;
  135                         mbufcp += xfer;
  136                         uiocp += xfer;
  137                         uiop->uio_offset += xfer;
  138                         uiop->uio_resid -= xfer;
  139                 }
  140                 if (uiop->uio_iov->iov_len <= siz) {
  141                         uiop->uio_iovcnt--;
  142                         uiop->uio_iov++;
  143                 } else {
  144                         uiop->uio_iov->iov_base =
  145                             (char *)uiop->uio_iov->iov_base + uiosiz;
  146                         uiop->uio_iov->iov_len -= uiosiz;
  147                 }
  148                 siz -= uiosiz;
  149         }
  150         *dpos = mbufcp;
  151         *mrep = mp;
  152         if (rem > 0) {
  153                 if (len < rem)
  154                         error = nfs_adv(mrep, dpos, rem, len);
  155                 else
  156                         *dpos += rem;
  157         }
  158         return (error);
  159 }
  160 
  161 /*
  162  * Help break down an mbuf chain by setting the first siz bytes contiguous
  163  * pointed to by returned val.
  164  * This is used by the macros nfsm_dissect for tough
  165  * cases. (The macros use the vars. dpos and dpos2)
  166  */
  167 void *
  168 nfsm_disct(struct mbuf **mdp, caddr_t *dposp, int siz, int left, int how)
  169 {
  170         struct mbuf *mp, *mp2;
  171         int siz2, xfer;
  172         caddr_t ptr, npos = NULL;
  173         void *ret;
  174 
  175         mp = *mdp;
  176         while (left == 0) {
  177                 *mdp = mp = mp->m_next;
  178                 if (mp == NULL)
  179                         return NULL;
  180                 left = mp->m_len;
  181                 *dposp = mtod(mp, caddr_t);
  182         }
  183         if (left >= siz) {
  184                 ret = *dposp;
  185                 *dposp += siz;
  186         } else if (mp->m_next == NULL) {
  187                 return NULL;
  188         } else if (siz > MHLEN) {
  189                 panic("nfs S too big");
  190         } else {
  191                 MGET(mp2, how, MT_DATA);
  192                 if (mp2 == NULL)
  193                         return NULL;
  194                 mp2->m_len = siz;
  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                 npos = mtod(mp2, caddr_t);
  206                 /* Loop around copying up the siz2 bytes */
  207                 while (siz2 > 0) {
  208                         if (mp2 == NULL)
  209                                 return NULL;
  210                         xfer = (siz2 > mp2->m_len) ? mp2->m_len : siz2;
  211                         if (xfer > 0) {
  212                                 bcopy(mtod(mp2, caddr_t), ptr, xfer);
  213                                 mp2->m_data += xfer;
  214                                 mp2->m_len -= xfer;
  215                                 ptr += xfer;
  216                                 siz2 -= xfer;
  217                         }
  218                         if (siz2 > 0) {
  219                                 mp2 = mp2->m_next;
  220                                 if (mp2 != NULL)
  221                                         npos = mtod(mp2, caddr_t);
  222                         }
  223                 }
  224                 *mdp = mp2;
  225                 *dposp = mtod(mp2, caddr_t);
  226                 if (!nfsm_aligned(*dposp, u_int32_t)) {
  227                         bcopy(*dposp, npos, mp2->m_len);
  228                         mp2->m_data = npos;
  229                         *dposp = npos;
  230                 }
  231         }
  232         return ret;
  233 }
  234 
  235 /*
  236  * Advance the position in the mbuf chain.
  237  */
  238 int
  239 nfs_adv(struct mbuf **mdp, caddr_t *dposp, int offs, int left)
  240 {
  241         struct mbuf *m;
  242         int s;
  243 
  244         m = *mdp;
  245         s = left;
  246         while (s < offs) {
  247                 offs -= s;
  248                 m = m->m_next;
  249                 if (m == NULL)
  250                         return (EBADRPC);
  251                 s = m->m_len;
  252         }
  253         *mdp = m;
  254         *dposp = mtod(m, caddr_t)+offs;
  255         return (0);
  256 }
  257 
  258 void *
  259 nfsm_build_xx(int s, struct mbuf **mb, caddr_t *bpos)
  260 {
  261         struct mbuf *mb2;
  262         void *ret;
  263 
  264         if (s > M_TRAILINGSPACE(*mb)) {
  265                 MGET(mb2, M_WAIT, MT_DATA);
  266                 if (s > MLEN)
  267                         panic("build > MLEN");
  268                 (*mb)->m_next = mb2;
  269                 *mb = mb2;
  270                 (*mb)->m_len = 0;
  271                 *bpos = mtod(*mb, caddr_t);
  272         }
  273         ret = *bpos;
  274         (*mb)->m_len += s;
  275         *bpos += s;
  276         return ret;
  277 }
  278 
  279 void *
  280 nfsm_dissect_xx(int s, struct mbuf **md, caddr_t *dpos)
  281 {
  282         return nfsm_dissect_xx_sub(s, md, dpos, M_WAIT);
  283 }
  284 
  285 void *
  286 nfsm_dissect_xx_nonblock(int s, struct mbuf **md, caddr_t *dpos)
  287 {
  288         return nfsm_dissect_xx_sub(s, md, dpos, M_DONTWAIT);
  289 }
  290 
  291 static void *
  292 nfsm_dissect_xx_sub(int s, struct mbuf **md, caddr_t *dpos, int how)
  293 {
  294         int t1;
  295         char *cp2;
  296         void *ret;
  297 
  298         t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
  299         if (t1 >= s) {
  300                 ret = *dpos;
  301                 *dpos += s;
  302                 return ret;
  303         }
  304         cp2 = nfsm_disct(md, dpos, s, t1, how); 
  305         return cp2;
  306 }
  307 
  308 int
  309 nfsm_strsiz_xx(int *s, int m, struct mbuf **mb, caddr_t *bpos)
  310 {
  311         u_int32_t *tl;
  312 
  313         tl = nfsm_dissect_xx(NFSX_UNSIGNED, mb, bpos);
  314         if (tl == NULL)
  315                 return EBADRPC;
  316         *s = fxdr_unsigned(int32_t, *tl);
  317         if (*s > m)
  318                 return EBADRPC;
  319         return 0;
  320 }
  321 
  322 int
  323 nfsm_adv_xx(int s, struct mbuf **md, caddr_t *dpos)
  324 {
  325         int t1;
  326 
  327         t1 = mtod(*md, caddr_t) + (*md)->m_len - *dpos;
  328         if (t1 >= s) {
  329                 *dpos += s;
  330                 return 0;
  331         }
  332         t1 = nfs_adv(md, dpos, s, t1);
  333         if (t1)
  334                 return t1;
  335         return 0;
  336 }
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FreeBSD/Linux Kernel Cross Reference sys/nfs/nfs_common.c

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