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tmpfs.c revision 1.4.18.1 
      1 /*	$NetBSD: tmpfs.c,v 1.4.18.1 2008/05/18 12:36:05 yamt 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 1.4.18.1 2008/05/18 12:36:05 yamt 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 = (long)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 }
     79