usr.bin/fstat/tmpfs.c

   1 /*      $NetBSD: tmpfs.c,v 1.7 2008/07/29 09:10:09 pooka Exp $  */
   2
   3 /*-
   4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __RCSID("$NetBSD: tmpfs.c,v 1.7 2008/07/29 09:10:09 pooka Exp $");
  31
  32 #include <sys/types.h>
  33 #include <sys/param.h>
  34 #include <sys/time.h>
  35 #include <sys/proc.h>
  36 #include <sys/stat.h>
  37 #include <sys/vnode.h>
  38 #include <sys/mount.h>
  39
  40 #include <fs/tmpfs/tmpfs.h>
  41
  42 #include <err.h>
  43 #include <kvm.h>
  44 #include "fstat.h"
  45
  46 int
  47 tmpfs_filestat(struct vnode *vp, struct filestat *fsp)
  48 {
  49         struct tmpfs_node tn;
  50         struct mount mt;
  51
  52         if (!KVM_READ(VP_TO_TMPFS_NODE(vp), &tn, sizeof(tn))) {
  53                 dprintf("can't read tmpfs_node at %p for pid %d",
  54                     VP_TO_TMPFS_NODE(vp), Pid);
  55                 return 0;
  56         }
  57         if (!KVM_READ(vp->v_mount, &mt, sizeof(mt))) {
  58                 dprintf("can't read mount at %p for pid %d",
  59                     vp->v_mount, Pid);
  60                 return 0;
  61         }
  62
  63         fsp->fsid = mt.mnt_stat.f_fsidx.__fsid_val[0];
  64         fsp->fileid = tn.tn_id;
  65         fsp->mode = tn.tn_mode | getftype(vp->v_type);
  66         fsp->size = tn.tn_size;
  67         switch (tn.tn_type) {
  68         case VBLK:
  69         case VCHR:
  70                 fsp->rdev = tn.tn_spec.tn_dev.tn_rdev;
  71                 break;
  72         default:
  73                 fsp->rdev = 0;
  74                 break;
  75         }
  76
  77         return 1;
  78 }