usr.bin/fstat/tmpfs.c

   1 /*
   2  * Copyright (c) 2013 The DragonFly Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *    the documentation and/or other materials provided with the
  13  *    distribution.
  14  * 3. Neither the name of The DragonFly Project nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific, prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/stat.h>
  34 #include <sys/time.h>
  35
  36 #include <kvm.h>
  37 #include <stdio.h>
  38
  39 #define _KERNEL_STRUCTURES
  40 #include <sys/vnode.h>
  41 #include <vfs/tmpfs/tmpfs.h>
  42 #undef _KERNEL_STRUCTURES
  43
  44 #include "fstat.h"
  45
  46 int
  47 tmpfs_filestat(struct vnode *vp, struct filestat *fsp)
  48 {
  49         struct tmpfs_node ino;
  50         struct mount mount_l;
  51
  52         if (!kread(VTOI(vp), &ino, sizeof(ino))) {
  53                 dprintf(stderr, "can't read struct tmpfs_node at %p for pid %d\n",
  54                     VTOI(vp), Pid);
  55                 return 0;
  56         }
  57         if (!kread(vp->v_mount, &mount_l, sizeof(struct mount))) {
  58                 dprintf(stderr, "can't read struct mount at %p for pid %d\n",
  59                     vp->v_mount, Pid);
  60                 return 0;
  61         }
  62         fsp->fsid = mount_l.mnt_stat.f_fsid.val[0];
  63         fsp->mode = ino.tn_mode | mtrans(ino.tn_type);
  64         fsp->fileid = ino.tn_id;
  65         fsp->size = ino.tn_size;
  66         fsp->rdev = ino.tn_spec.tn_rdev;
  67         return 1;
  68 }