The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/emulation/43bsd/43bsd_file.c

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    1 /*
    2  * 43BSD_FILE.C         - 4.3BSD compatibility file syscalls
    3  *
    4  * Copyright (c) 1989, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. 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  * $DragonFly: src/sys/emulation/43bsd/43bsd_file.c,v 1.11 2006/09/05 00:55:44 dillon Exp $
   37  *      from: DragonFly kern/vfs_syscalls.c,v 1.20
   38  *
   39  * These syscalls used to live in kern/vfs_syscalls.c.  They are modified
   40  * to use the new split syscalls.
   41  */
   42 
   43 #include "opt_compat.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/sysproto.h>
   48 #include <sys/conf.h>
   49 #include <sys/dirent.h>
   50 #include <sys/fcntl.h>
   51 #include <sys/file.h>
   52 #include <sys/filedesc.h>
   53 #include <sys/kernel.h>
   54 #include <sys/kern_syscall.h>
   55 #include <sys/malloc.h>
   56 #include <sys/mount.h>
   57 #include <sys/uio.h>
   58 #include <sys/namei.h>
   59 #include <sys/nlookup.h>
   60 #include <sys/vnode.h>
   61 
   62 #include <sys/mplock2.h>
   63 
   64 #include <vfs/union/union.h>
   65 
   66 /*
   67  * MPALMOSTSAFE
   68  */
   69 int
   70 sys_ocreat(struct ocreat_args *uap)
   71 {
   72         struct nlookupdata nd;
   73         int error;
   74 
   75         get_mplock();
   76         error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
   77         if (error == 0) {
   78                 error = kern_open(&nd, O_WRONLY | O_CREAT | O_TRUNC, 
   79                                     uap->mode, &uap->sysmsg_iresult);
   80         }
   81         rel_mplock();
   82         return (error);
   83 }
   84 
   85 /*
   86  * MPALMOSTSAFE
   87  */
   88 int
   89 sys_oftruncate(struct oftruncate_args *uap)
   90 {
   91         int error;
   92 
   93         get_mplock();
   94         error = kern_ftruncate(uap->fd, uap->length);
   95         rel_mplock();
   96 
   97         return (error);
   98 }
   99 
  100 /*
  101  * MPSAFE
  102  */
  103 int
  104 sys_olseek(struct olseek_args *uap)
  105 {
  106         int error;
  107 
  108         error = kern_lseek(uap->fd, uap->offset, uap->whence,
  109                            &uap->sysmsg_offset);
  110 
  111         return (error);
  112 }
  113 
  114 /*
  115  * MPALMOSTSAFE
  116  */
  117 int
  118 sys_otruncate(struct otruncate_args *uap)
  119 {
  120         struct nlookupdata nd;
  121         int error;
  122 
  123         get_mplock();
  124         error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
  125         if (error == 0)
  126                 error = kern_truncate(&nd, uap->length);
  127         nlookup_done(&nd);
  128         rel_mplock();
  129         return (error);
  130 }
  131 
  132 #define PADDED_SIZE(x)  \
  133         ((sizeof(struct odirent) + (x) + 1 + 3) & ~3)
  134 #define MAX_NAMELEN     255
  135 
  136 struct odirent {
  137         uint32_t        od_fileno;
  138         uint16_t        od_reclen;
  139         uint8_t         od_type;
  140         uint8_t         od_namlen;
  141         char            od_name[];
  142 };
  143 
  144 /*
  145  * MPALMOSTSAFE
  146  */
  147 int
  148 sys_ogetdirentries(struct ogetdirentries_args *uap)
  149 {
  150         int error, bytes_transfered;
  151         char *buf, *outbuf;
  152         size_t len;
  153         struct dirent *ndp;
  154         struct odirent *destdp;
  155         long base;
  156 
  157         if (uap->count > 16384)
  158                 len = 16384;
  159         else
  160                 len = uap->count;
  161 
  162         buf = kmalloc(len, M_TEMP, M_WAITOK);
  163 
  164         get_mplock();
  165         error = kern_getdirentries(uap->fd, buf, len,
  166                                    &base, &bytes_transfered, UIO_SYSSPACE);
  167         rel_mplock();
  168 
  169         if (error) {
  170                 kfree(buf, M_TEMP);
  171                 return(error);
  172         }
  173 
  174         ndp = (struct dirent *)buf;
  175         outbuf = uap->buf;
  176         destdp = kmalloc(PADDED_SIZE(MAX_NAMELEN), M_TEMP, M_WAITOK);
  177 
  178         for (; (char *)ndp < buf + bytes_transfered; ndp = _DIRENT_NEXT(ndp)) {
  179                 if ((char *)_DIRENT_NEXT(ndp) > buf + bytes_transfered)
  180                         break;
  181                 if (ndp->d_namlen > MAX_NAMELEN)
  182                         continue;
  183                 destdp->od_fileno = ndp->d_ino;
  184 #if BYTE_ORDER == LITTLE_ENDIAN
  185                 destdp->od_type = ndp->d_namlen;
  186                 destdp->od_namlen = ndp->d_type;
  187 #else
  188                 destdp->od_type = ndp->d_type;
  189                 destdp->od_namlen = ndp->d_namlen;
  190 #endif
  191                 destdp->od_reclen = PADDED_SIZE(destdp->od_namlen);
  192                 if (destdp->od_reclen > len)
  193                         break; /* XXX can not happen */
  194                 bcopy(ndp->d_name, destdp->od_name, destdp->od_namlen);
  195                 bzero(destdp->od_name + destdp->od_namlen,
  196                     PADDED_SIZE(destdp->od_namlen) - sizeof(*destdp) -
  197                     destdp->od_namlen);
  198                 error = copyout(destdp, outbuf,
  199                     PADDED_SIZE(destdp->od_namlen));
  200                 if (error)
  201                         break;
  202                 outbuf += PADDED_SIZE(destdp->od_namlen);
  203                 len -= PADDED_SIZE(destdp->od_namlen);
  204         }
  205 
  206         kfree(destdp, M_TEMP);
  207         kfree(buf, M_TEMP);
  208         uap->sysmsg_iresult = (int)(outbuf - uap->buf);
  209         return (0);
  210 }

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