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      1 /*	$NetBSD: tmpfs.c,v 1.11 2017/06/09 00:13:29 chs 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 1.11 2017/06/09 00:13:29 chs 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 #define __EXPOSE_MOUNT
     39 #include <sys/mount.h>
     40 
     41 #include <fs/tmpfs/tmpfs.h>
     42 
     43 #include <err.h>
     44 #include <kvm.h>
     45 #include "fstat.h"
     46 
     47 int
     48 tmpfs_filestat(struct vnode *vp, struct filestat *fsp)
     49 {
     50 	struct tmpfs_node tn;
     51 	struct mount mt;
     52 
     53 	if (!KVM_READ(VP_TO_TMPFS_NODE(vp), &tn, sizeof(tn))) {
     54 		dprintf("can't read tmpfs_node at %p for pid %d",
     55 		    VP_TO_TMPFS_NODE(vp), Pid);
     56 		return 0;
     57 	}
     58 	if (!KVM_READ(vp->v_mount, &mt, sizeof(mt))) {
     59 		dprintf("can't read mount at %p for pid %d",
     60 		    vp->v_mount, Pid);
     61 		return 0;
     62 	}
     63 
     64 	fsp->fsid = mt.mnt_stat.f_fsidx.__fsid_val[0];
     65 	fsp->fileid = tn.tn_id;
     66 	fsp->mode = tn.tn_mode | getftype(vp->v_type);
     67 	fsp->size = tn.tn_size;
     68 	switch (tn.tn_type) {
     69 	case VBLK:
     70 	case VCHR:
     71 		fsp->rdev = tn.tn_spec.tn_dev.tn_rdev;
     72 		break;
     73 	default:
     74 		fsp->rdev = 0;
     75 		break;
     76 	}
     77 
     78 	return 1;
     79 }
     80