sys/emulation/43bsd/43bsd_file.c

   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  * These syscalls used to live in kern/vfs_syscalls.c.  They are modified
  37  * to use the new split syscalls.
  38  */
  39
  40 #include "opt_compat.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/systm.h>
  44 #include <sys/sysproto.h>
  45 #include <sys/conf.h>
  46 #include <sys/dirent.h>
  47 #include <sys/fcntl.h>
  48 #include <sys/file.h>
  49 #include <sys/filedesc.h>
  50 #include <sys/kernel.h>
  51 #include <sys/kern_syscall.h>
  52 #include <sys/malloc.h>
  53 #include <sys/mount.h>
  54 #include <sys/uio.h>
  55 #include <sys/namei.h>
  56 #include <sys/nlookup.h>
  57 #include <sys/vnode.h>
  58
  59 #include <sys/mplock2.h>
  60
  61 /*
  62  * MPALMOSTSAFE
  63  */
  64 int
  65 sys_ocreat(struct ocreat_args *uap)
  66 {
  67         struct nlookupdata nd;
  68         int error;
  69
  70         get_mplock();
  71         error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
  72         if (error == 0) {
  73                 error = kern_open(&nd, O_WRONLY | O_CREAT | O_TRUNC,
  74                                     uap->mode, &uap->sysmsg_iresult);
  75         }
  76         rel_mplock();
  77         return (error);
  78 }
  79
  80 /*
  81  * MPALMOSTSAFE
  82  */
  83 int
  84 sys_oftruncate(struct oftruncate_args *uap)
  85 {
  86         int error;
  87
  88         get_mplock();
  89         error = kern_ftruncate(uap->fd, uap->length);
  90         rel_mplock();
  91
  92         return (error);
  93 }
  94
  95 /*
  96  * MPSAFE
  97  */
  98 int
  99 sys_olseek(struct olseek_args *uap)
 100 {
 101         int error;
 102
 103         error = kern_lseek(uap->fd, uap->offset, uap->whence,
 104                            &uap->sysmsg_offset);
 105
 106         return (error);
 107 }
 108
 109 /*
 110  * MPALMOSTSAFE
 111  */
 112 int
 113 sys_otruncate(struct otruncate_args *uap)
 114 {
 115         struct nlookupdata nd;
 116         int error;
 117
 118         get_mplock();
 119         error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
 120         if (error == 0)
 121                 error = kern_truncate(&nd, uap->length);
 122         nlookup_done(&nd);
 123         rel_mplock();
 124         return (error);
 125 }
 126
 127 #define PADDED_SIZE(x)  \
 128         ((sizeof(struct odirent) + (x) + 1 + 3) & ~3)
 129 #define MAX_NAMELEN     255
 130
 131 struct odirent {
 132         uint32_t        od_fileno;
 133         uint16_t        od_reclen;
 134         uint8_t         od_type;
 135         uint8_t         od_namlen;
 136         char            od_name[];
 137 };
 138
 139 /*
 140  * MPALMOSTSAFE
 141  */
 142 int
 143 sys_ogetdirentries(struct ogetdirentries_args *uap)
 144 {
 145         int error, bytes_transfered;
 146         char *buf, *outbuf;
 147         size_t len;
 148         struct dirent *ndp;
 149         struct odirent *destdp;
 150         long base;
 151
 152         if (uap->count > 16384)
 153                 len = 16384;
 154         else
 155                 len = uap->count;
 156
 157         buf = kmalloc(len, M_TEMP, M_WAITOK);
 158
 159         get_mplock();
 160         error = kern_getdirentries(uap->fd, buf, len,
 161                                    &base, &bytes_transfered, UIO_SYSSPACE);
 162         rel_mplock();
 163
 164         if (error) {
 165                 kfree(buf, M_TEMP);
 166                 return(error);
 167         }
 168
 169         ndp = (struct dirent *)buf;
 170         outbuf = uap->buf;
 171         destdp = kmalloc(PADDED_SIZE(MAX_NAMELEN), M_TEMP, M_WAITOK);
 172
 173         for (; (char *)ndp < buf + bytes_transfered; ndp = _DIRENT_NEXT(ndp)) {
 174                 if ((char *)_DIRENT_NEXT(ndp) > buf + bytes_transfered)
 175                         break;
 176                 if (ndp->d_namlen > MAX_NAMELEN)
 177                         continue;
 178                 destdp->od_fileno = ndp->d_ino;
 179 #if BYTE_ORDER == LITTLE_ENDIAN
 180                 destdp->od_type = ndp->d_namlen;
 181                 destdp->od_namlen = ndp->d_type;
 182 #else
 183                 destdp->od_type = ndp->d_type;
 184                 destdp->od_namlen = ndp->d_namlen;
 185 #endif
 186                 destdp->od_reclen = PADDED_SIZE(destdp->od_namlen);
 187                 if (destdp->od_reclen > len)
 188                         break; /* XXX can not happen */
 189                 bcopy(ndp->d_name, destdp->od_name, destdp->od_namlen);
 190                 bzero(destdp->od_name + destdp->od_namlen,
 191                     PADDED_SIZE(destdp->od_namlen) - sizeof(*destdp) -
 192                     destdp->od_namlen);
 193                 error = copyout(destdp, outbuf,
 194                     PADDED_SIZE(destdp->od_namlen));
 195                 if (error)
 196                         break;
 197                 outbuf += PADDED_SIZE(destdp->od_namlen);
 198                 len -= PADDED_SIZE(destdp->od_namlen);
 199         }
 200
 201         kfree(destdp, M_TEMP);
 202         kfree(buf, M_TEMP);
 203         uap->sysmsg_iresult = (int)(outbuf - uap->buf);
 204         return (0);
 205 }