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. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  * $DragonFly: src/sys/emulation/43bsd/43bsd_file.c,v 1.11 2006/09/05 00:55:44 dillon Exp $
  41  *      from: DragonFly kern/vfs_syscalls.c,v 1.20
  42  *
  43  * These syscalls used to live in kern/vfs_syscalls.c.  They are modified
  44  * to use the new split syscalls.
  45  */
  46
  47 #include "opt_compat.h"
  48
  49 #include <sys/param.h>
  50 #include <sys/systm.h>
  51 #include <sys/sysproto.h>
  52 #include <sys/conf.h>
  53 #include <sys/dirent.h>
  54 #include <sys/fcntl.h>
  55 #include <sys/file.h>
  56 #include <sys/filedesc.h>
  57 #include <sys/kernel.h>
  58 #include <sys/kern_syscall.h>
  59 #include <sys/malloc.h>
  60 #include <sys/mount.h>
  61 #include <sys/uio.h>
  62 #include <sys/namei.h>
  63 #include <sys/nlookup.h>
  64 #include <sys/vnode.h>
  65
  66 #include <sys/mplock2.h>
  67
  68 #include <vfs/union/union.h>
  69
  70 /*
  71  * MPALMOSTSAFE
  72  */
  73 int
  74 sys_ocreat(struct ocreat_args *uap)
  75 {
  76         struct nlookupdata nd;
  77         int error;
  78
  79         get_mplock();
  80         error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
  81         if (error == 0) {
  82                 error = kern_open(&nd, O_WRONLY | O_CREAT | O_TRUNC,
  83                                     uap->mode, &uap->sysmsg_iresult);
  84         }
  85         rel_mplock();
  86         return (error);
  87 }
  88
  89 /*
  90  * MPALMOSTSAFE
  91  */
  92 int
  93 sys_oftruncate(struct oftruncate_args *uap)
  94 {
  95         int error;
  96
  97         get_mplock();
  98         error = kern_ftruncate(uap->fd, uap->length);
  99         rel_mplock();
 100
 101         return (error);
 102 }
 103
 104 /*
 105  * MPSAFE
 106  */
 107 int
 108 sys_olseek(struct olseek_args *uap)
 109 {
 110         int error;
 111
 112         error = kern_lseek(uap->fd, uap->offset, uap->whence,
 113                            &uap->sysmsg_offset);
 114
 115         return (error);
 116 }
 117
 118 /*
 119  * MPALMOSTSAFE
 120  */
 121 int
 122 sys_otruncate(struct otruncate_args *uap)
 123 {
 124         struct nlookupdata nd;
 125         int error;
 126
 127         get_mplock();
 128         error = nlookup_init(&nd, uap->path, UIO_USERSPACE, NLC_FOLLOW);
 129         if (error == 0)
 130                 error = kern_truncate(&nd, uap->length);
 131         nlookup_done(&nd);
 132         rel_mplock();
 133         return (error);
 134 }
 135
 136 #define PADDED_SIZE(x)  \
 137         ((sizeof(struct odirent) + (x) + 1 + 3) & ~3)
 138 #define MAX_NAMELEN     255
 139
 140 struct odirent {
 141         uint32_t        od_fileno;
 142         uint16_t        od_reclen;
 143         uint8_t         od_type;
 144         uint8_t         od_namlen;
 145         char            od_name[];
 146 };
 147
 148 /*
 149  * MPALMOSTSAFE
 150  */
 151 int
 152 sys_ogetdirentries(struct ogetdirentries_args *uap)
 153 {
 154         int error, bytes_transfered;
 155         char *buf, *outbuf;
 156         size_t len;
 157         struct dirent *ndp;
 158         struct odirent *destdp;
 159         long base;
 160
 161         if (uap->count > 16384)
 162                 len = 16384;
 163         else
 164                 len = uap->count;
 165
 166         buf = kmalloc(len, M_TEMP, M_WAITOK);
 167
 168         get_mplock();
 169         error = kern_getdirentries(uap->fd, buf, len,
 170                                    &base, &bytes_transfered, UIO_SYSSPACE);
 171         rel_mplock();
 172
 173         if (error) {
 174                 kfree(buf, M_TEMP);
 175                 return(error);
 176         }
 177
 178         ndp = (struct dirent *)buf;
 179         outbuf = uap->buf;
 180         destdp = kmalloc(PADDED_SIZE(MAX_NAMELEN), M_TEMP, M_WAITOK);
 181
 182         for (; (char *)ndp < buf + bytes_transfered; ndp = _DIRENT_NEXT(ndp)) {
 183                 if ((char *)_DIRENT_NEXT(ndp) > buf + bytes_transfered)
 184                         break;
 185                 if (ndp->d_namlen > MAX_NAMELEN)
 186                         continue;
 187                 destdp->od_fileno = ndp->d_ino;
 188 #if BYTE_ORDER == LITTLE_ENDIAN
 189                 destdp->od_type = ndp->d_namlen;
 190                 destdp->od_namlen = ndp->d_type;
 191 #else
 192                 destdp->od_type = ndp->d_type;
 193                 destdp->od_namlen = ndp->d_namlen;
 194 #endif
 195                 destdp->od_reclen = PADDED_SIZE(destdp->od_namlen);
 196                 if (destdp->od_reclen > len)
 197                         break; /* XXX can not happen */
 198                 bcopy(ndp->d_name, destdp->od_name, destdp->od_namlen);
 199                 bzero(destdp->od_name + destdp->od_namlen,
 200                     PADDED_SIZE(destdp->od_namlen) - sizeof(*destdp) -
 201                     destdp->od_namlen);
 202                 error = copyout(destdp, outbuf,
 203                     PADDED_SIZE(destdp->od_namlen));
 204                 if (error)
 205                         break;
 206                 outbuf += PADDED_SIZE(destdp->od_namlen);
 207                 len -= PADDED_SIZE(destdp->od_namlen);
 208         }
 209
 210         kfree(destdp, M_TEMP);
 211         kfree(buf, M_TEMP);
 212         uap->sysmsg_iresult = (int)(outbuf - uap->buf);
 213         return (0);
 214 }